All subdivisions shall be designed and constructed
to conform with the principles, requirements, standards and specifications
enumerated in the following sections of the subdivision design standards
in the City of Lexington.
A major share of what eventually become publicly
owned improvements is designed and constructed by private interests.
This article has been prepared for the purpose of ensuring that the
design of such improvements will result in construction meeting the
requirements of the City. The intent of this article is to explain
the processing requirements and procedures as required by the City
Code for the various documents required prior to, during, and after
construction in order to accomplish these purposes. In addition, this
article is intended to provide a uniform design criteria for facilities
designed for or directly by the City.
The review and approval of plans, specifications,
and contract documents for certain types of improvements are also
the legal responsibility of various other public agencies in addition
to the City. This article is not intended as a substitute for the
requirements of such other public agencies. It shall be the design
engineer's responsibility to see that the proposed plans, specifications,
and contract documents meet the legal requirements of all other public
agencies and that any and all permits and bonds required by such agencies
are secured.
It is recommended that, prior to the development
of a preliminary plan and/or detailed engineering plans and specifications,
the design engineer meet with the City Engineer or his representative
to review City requirements for the proposed project. The request
for this preliminary meeting, if desired, shall be instituted by the
design engineer.
A.
Subdivision preliminary plan and supporting documents.
(1)
Required form of a preliminary plan.
(a)
Plans, drawings, surveys, maps, schematics,
and comparable material shall be drawn so that clear and legible transparent
or contact prints and photostatic (photographic) copies (reproductions)
can be made with a minimum size of 24 inches by 18 inches and a maximum
width of 24 inches (594 mm), preferably 24 inches by 36 inches (594
mm by 841 mm), but with a maximum length of 36 inches (841 mm). If
the total preliminary plan exceeds more than one sheet, then a one-sheet
comprehensive plan of the entire development shall be submitted, and
this comprehensive plan sheet will not exceed 48 inches (1,219 mm)
in width.[1]
(b)
To be consistent with the current GIS requirements,
the City may encourage but does not require that a digital computer-aided
drafting file be submitted in accordance with provisions of this section.
The official submittal shall be the signed reproducible copy.
(2)
Required content of a preliminary plan supporting
documents.
(a)
Identification and description.
[1]
Name of the subdivision, not duplicating the
name of any other subdivision, the final plat of which has been recorded
in McLean County, Illinois.
[2]
Legal description of all property included in
the preliminary plan, including a reference to the section, township,
and range.
[3]
Name, address, and phone number of the owner
or owners of record of all property within the preliminary plan.
[4]
Name, address, and phone number of the developer
of the proposed subdivision.
[6]
Name, address, and phone number of the surveyor
or engineering firm preparing the boundary survey.
[7]
Name, address, and phone number of the design
engineer preparing any part of the preliminary plan or supporting
material.
[8]
Name, address, and phone number of attorney(s)
representing the owner(s) and/or developer(s).
[9]
The source of all topographical data.
[10]
Total acreage (hectares) in the preliminary
plan.
(b)
Survey maps and drawings indicating existing
conditions. A professional Illinois land surveyor or licensed professional
engineer shall prepare graphic presentation of the following in each
case, with a north point designation as true North and a date of preparation
indicated on the survey map, drawing or plan. Unless otherwise noted,
the following shall be drawn to an engineering scale not to exceed
100 feet equals one inch (1,000:1):
[1]
Boundary line survey map with accurate distances
and angles with a permissible error of closure of one in 5,000 prepared
and certified accurate by an Illinois professional land surveyor.
[2]
Topographic map depicting existing contours
at vertical intervals of not more than two feet (0.5 m), with reference
to USGS datum; the location of watercourses, marshes, and other significant
features. Soil boring data and seepage tests may be required at locations
and depths as determined by the City Council.
[3]
[4]
The existing zoning and zoning district lines
within the area encompassed by the preliminary plan and the area within
100 feet (30 m) thereof.
[5]
Specific identification, location and dimensions,
if applicable, of the following located within 100 feet (30 m) of
the area included in the preliminary plan:
[a]
Rights-of-way.
[b]
Streets.
[c]
Roadways.
[d]
Drainageways, improved.
[e]
Drainageways, unimproved.
[f]
Walkways and trails.
[g]
Sidewalks.
[h]
Public easements.
[i]
Private easements.
[j]
Railroad rights-of-way.
[k]
Section lines (if included in the
description of the property).
[l]
Corporate limit lines.
[m]
Parks, schools, and other public
lands.
[n]
Buildings and structures to remain.
[o]
Buildings and structures to be
removed.
[6]
Identification, location, size, gradient and
invert elevation of sanitary sewers, storm sewers, drainage culverts,
catch basins and sanitary and storm sewer manholes located within
the area included in the preliminary plan, the area within 100 feet
(30 m) of the perimeter of the area included in the preliminary plan
or located elsewhere if such constitutes the nearest existing sanitary
sewer, storm sewer, drainage culvert, catch basin, sanitary sewer
manhole or storm sewer manhole serving the area included in the preliminary
plan.
[7]
Identification and location of water mains,
including all valves and hydrants and any other underground utilities
located within the area included in the preliminary plan, the area
within 100 feet (30 m) of the perimeter of the area included in the
preliminary plan or located elsewhere if such constitutes the nearest
existing water main, valve or hydrant or other underground utility
serving the area included in the preliminary plan.
[8]
Location of or reference to location of existing
monuments or survey markers used in preparation of the boundary line
survey map and benchmarks.
[9]
Location map drawn to any scale showing an area
bounded by the nearest major or collector street, but not less than
two miles (3.0 km) beyond the boundaries of the area included in the
preliminary plan.
(c)
Surveys, maps, plans and drawings of proposed
conditions. A registered professional engineer shall prepare and certify
as accurate to the degree of accuracy specified surveys, maps, plans
and drawings with a north point designated as true North and containing
a date of preparation depicting the proposed arrangement of the area
included in the preliminary plan indicating each of the following
to an engineering scale not to exceed one inch equals 100 feet (1:1,000);
[1]
Identification, location and dimensions of any
of the following required or proposed:
[a]
Rights-of-way.
[b]
Interior streets with approximate
elevation, widths and proposed gradient.
[c]
Exterior streets with approximate
elevation, widths and proposed gradient.
[d]
Exterior roadways with approximate
elevation, widths and proposed gradient.
[e]
Street and roadway names.
[f]
Alleys with approximate elevation
and proposed gradient.
[g]
Walkways and trails.
[h]
Sidewalks.
[i]
Public easements.
[j]
Private easements.
[k]
Lots.
[l]
Outlots.
[m]
Minimum front rear, side yards
and building setback lines, indicating dimensions.
[n]
Other areas proposed for dedication
or reservation to the public, indicating in each the approximate acreage.
[o]
Railroad crossings and rights-of-way.
[p]
Bridges.
[5]
Direction of stormwater runoff from each lot
and outlot proposed or required in the preliminary plan.
(d)
The preliminary plan shall contain the name(s)
and seal or seals of the professional engineer or engineers preparing
all or any portion of the preliminary plan. All waivers requested
of the City's codes and ordinances shall be listed on the preliminary
plan. Approval of a preliminary plan shall not constitute waiver of
any applicable City codes and ordinances unless the waiver is specifically
approved by the Mayor and City Council.
(e)
If applicable, accompanying the preliminary plan shall be an application for a special flood hazard area development permit as required in Chapter 300, Zoning. The application form has been provided as Exhibit L in the Appendix.[3] The preliminary plan shall show the limits of the special
flood hazard area, changes in grade resulting from excavation and
filling, location and lowest floor elevation of buildings proposed
within the special flood hazard area.
[3]
Editor's Note: Exhibit L is included at the end of this chapter.
(3)
Preliminary plan submission procedure.
(a)
Initial submittal. The owner shall submit to
the City Clerk four paper copies of a preliminary plan in the form
and providing all information required by this chapter.
(b)
Final submittal. Upon approval of a preliminary
plan by the City Council, the owner shall submit seven paper and one
reproducible Mylar copy showing any changes requested by the City
Council. The Mylar copy shall be considered the official copy.
B.
Public improvement engineering plans and specifications.
(1)
Required form of public improvement engineering plans
and specifications.
(a)
Public improvement engineering plans and specifications,
drawings, schematics and comparable material shall be drawn on transparent
abelene or black waterproof drawing ink on Mylar from which clear
and legible transparent or contact prints and photostatic copies can
be made, with a minimum width of 24 inches by 18 inches and a maximum
width of 24 inches (594 mm), preferably 24 inches by 36 inches (594
mm by 841 mm), but with a maximum length of 36 inches (841 mm). This
shall be considered the official submittal.
(b)
Supporting material shall be typed on paper
not exceeding 8 1/2 inches by 11 inches in size (A-size).
(c)
General drafting requirements.
[1]
Plan sheets shall be drawn to scale. The scale
shall not normally be greater than one inch equals 50 feet (1:600)
horizontal and one inch equals 10 feet (1:100) vertical. The scale
shall be clearly labeled on the plan.
[2]
Plan sheets shall include a North arrow. The
North arrow should normally be oriented to the left, top or right
of the sheet.
[3]
Plan sheets shall include a title block, preferably
near the lower right of the sheet. The title block shall include the
name and address of the design engineer preparing the plan, the date
and the sheet number.
[4]
Stationing shall normally increase from left
to right, south to north and west to east.
(2)
Required content of public improvement engineering
plans and specifications.
(a)
Identification and description. The public improvement
engineering plans and specifications shall include a title sheet containing
the following information:
[1]
The name of the proposed subdivision within
which or for which the public improvements are proposed.
[2]
The name, address and phone number of the developer(s).
[3]
The name, address and phone number of the engineering
firm preparing any part of the engineering plans and specifications
and an indication of the part of the plans that the engineer or those
engineers prepared.
[4]
Seal or seals of the design engineer or engineers
preparing all or any portion of the engineering plans and specifications
certifying that the materials so prepared conform with all applicable
City codes and ordinances except as specifically noted as a requested
waiver.
[5]
Location map drawn to any scale showing area
bounded by the limits of the preliminary plan for which the engineering
plans are all or a portion thereof.
[6]
Two or more benchmark elevations referenced
to USGS datum within the boundaries of the project or within 100 feet
(30 m) outside the boundaries of the project.
[7]
An index to all sheets contained within the
submitted engineering plans.
(b)
Grading plan. The public improvement engineering
plans and specifications shall include a grading plan containing (but
not limited to) the following information:
[1]
Existing contours at vertical intervals of not
more than two feet (0.5 m), with reference to USGS datum.
[2]
Proposed finish ground surface elevations on
all lot corners.
[3]
Directional arrows of flow of surface waters
along rear and side lot lines.
[4]
Elevation of proposed ground surface at all
building sites (or pads).
[5]
Location, description, and surface elevation
of all drainage structures.
[6]
Directional arrows of flow for flood routing
for design storms which exceed the capacity of the proposed storm
sewers (minimum of one-hundred-year-frequency design storm).
[7]
Typical cross sections of flood routing channels
showing maximum depth of flow (one-hundred-year frequency).
[8]
Lot numbers.
(c)
Drainageway plan. The public improvement engineering
plans and specifications shall include a drainageway plan (if applicable)
containing (but not limited to) the following information:
[1]
Existing contours at vertical intervals of not
more than two feet (0.5 m), with reference to USGS datum.
[2]
Proposed alignment of center line of right-of-way
and right-of-way width for entire length of the proposed improvement
and existing alignment for 200 feet (60 m) upstream and downstream
of the improvement.
[3]
Proposed and existing profiles for entire length
of the improvement and existing profile for 200 feet (60 m) upstream
and downstream of the improvement.
[4]
Typical cross section of the drainageway improvement.
[5]
Cross sections of the improvement showing the
"before" and "after" ground surface elevations and one-hundred-year
flood surface elevations at 50 feet (15 m) intervals.
[6]
Lot numbers.
(d)
Erosion and sedimentation control plan. The
public improvement engineering plans and specifications shall include
a plan for controlling erosion and sedimentation by one or more of
the following methods for the period when site work commences to the
completion of the development:
(e)
Street, sidewalk and trail plan. The public
improvement engineering plans and specifications shall include a street,
sidewalk and trail plan containing (but not limited to) the following
information:
[1]
Existing and proposed street alignments showing
center line, face-of-curb, right-of-way, and stationing of roadways.
[2]
Typical cross sections for existing and proposed
streets, including street pavement, curb and gutter and sidewalks.
[3]
Existing and proposed profiles of pavement referenced
to center-line stationing and USGS datum. All proposed vertical curve
data shall be shown, including the station and elevation at fifteen-meter
(fifty-foot) intervals.
[4]
Existing and proposed alignment of sidewalks
showing edges of sidewalk.
[5]
Existing and proposed cross sections of roadways
on an average horizontal interval of 15 meters (50 feet) (may be omitted
for interior streets with curb and gutter).
[6]
Horizontal curve data for all curvilinear alignments
of existing and proposed roadways.
[7]
Lot numbers.
(f)
Storm sewer plan. The public improvement engineering
plans shall include a storm sewer plan containing (but not limited
to) the following information:
[1]
Alignment and location of existing and proposed
storm sewer conduits referenced to stationing.
[2]
Location and identification of all existing
and proposed drainage structures.
[3]
Size of existing and proposed conduits.
[4]
Profile of proposed conduits showing invert
elevations based on USGS datum, conduit gradient and crossings of
other existing and proposed utilities.
[5]
Locations along alignment of proposed conduit
of granular trench backfill placement.
[6]
Lot numbers.
(g)
Sanitary sewer plan. The public improvement
engineering plans and specifications shall include a sanitary sewer
plan containing (but not limited to) the following information:
[1]
Alignment and location of existing and proposed
sanitary sewer conduits referenced to stationing.
[2]
Location and identification of all existing
and proposed manholes.
[3]
Location and identification of all proposed
sewer services.
[4]
Size of existing and proposed sewer conduits
and services.
[5]
Profile of proposed sewer conduits showing invert
elevations based on USGS datum, conduit gradient and crossings of
other existing and proposed utilities.
[6]
Locations along alignment of proposed sewer
conduits and services of granular trench backfill placement.
[7]
Lot numbers.
(h)
Water main plan. The public improvement engineering
plans and specifications shall include a water main plan containing
(but not limited to) the following information:
[1]
Alignment and location of existing and proposed
water main conduits and service lines referenced to stationing.
[2]
Location and identification of all existing
and proposed valves, fittings and hydrants.
[3]
Location and identification of proposed service
lines.
[4]
Size of existing and proposed water main conduits
and services.
[5]
Profile of proposed water main conduit showing
elevations based on USGS datum and crossings of other existing and
proposed utilities. Profiles are not required for interior water mains.
[6]
Locations along alignment of proposed water
main conduits and services of granular trench backfill placement.
[7]
Lot numbers.
(j)
Sump pump discharge plan. The public improvement
engineering plans shall include a sump pump discharge plan containing
(but not limited to) the following information:
[1]
Alignment and location of existing and proposed
sump pump discharge conduits referenced to stationing.
[2]
Location and identification of all existing
and proposed structures, including (but not limited to) manholes,
junction tees/wyes, and cleanouts.
[3]
Size of existing and proposed conduits.
[4]
Profile of proposed conduits showing invert
elevations based on USGS datum and crossings of other existing and
proposed utilities (may be omitted for sump pump lines located adjacent
to and parallel with a proposed street with curb and gutter if shown
on the street typical section).
[5]
Locations along alignment of proposed conduit
of granular trench backfill placement.
[6]
Lot numbers.
(k)
(l)
Specific details. The public improvement engineering
plans and specifications shall include specific details containing
(but not limited to) the following information:
(m)
Standard details. The public improvement engineering
plans and specifications shall include standard details containing
(but not limited to) the following information:
C.
Final subdivision plats and supporting material.
(1)
Required form of final plats.
(a)
Final plats shall be drawn with black waterproof
drawing ink on Mylar, from which clear and legible transparent or
contact prints and photostatic copies can be made, with a maximum
width of 24 inches (594 mm), preferably 24 inches by 36 inches (594
mm by 841 mm), but with a maximum length of 36 inches (841 mm).
(b)
Supporting material shall be typed on paper
not exceeding 8 1/2 inches (210 mm) by 14 inches (356 mm) in
size.
(c)
To be consistent with current GIS requirements,
a digital submission shall be submitted in accordance with the provisions
of this section.
(2)
Required content of final plat.
(a)
Identification and description.
[1]
The name of the subdivision, not duplicating
the name of any other subdivision, a final plat of which has been
recorded in McLean County, Illinois.
[2]
The legal description of all property included
in the final plat, including a reference to the section, township,
and range; references to be tied with GIS monuments where available.
[3]
Name and address of the developer of the proposed
subdivision.
[4]
Name and address of the professional land surveyor
preparing the boundary survey.
[5]
Total area in the final plat in acres (hectares).
[6]
The name of the school district in which the
subdivision is located.
(b)
Lot, outlot, and public improvement configuration.
An Illinois professional land surveyor shall prepare and certify as
accurate angular and lineal dimensions of all lines, angles and curvatures
to an engineering scale not to exceed one inch equals 100 feet (1:100)
necessary to accurately depict the location of the following:
[1]
Rights-of-way, including the names of any streets
or roadways depicted.
[2]
Public and private easements.
[3]
Proposed lots of record consecutively numbered
and keyed on the plat (or on a supplemental sheet) showing the lots
platted of the approved preliminary plan (see Exhibit M in the Appendix[4]); lot numbers within a subdivision shall not be repeated
even if lots are resubdivided.
[4]
Editor's Note: Exhibit M is included at the end of this chapter.
[4]
Outlots, indicated consecutively and keyed on
the plat (or on a supplemental sheet) showing the outlots platted
of the approved preliminary plan.
[5]
Minimum front yard setbacks.
[6]
Other areas dedicated or reserved to the public.
[7]
Railroad rights-of-way.
[8]
Boundaries of the subdivision.
[9]
Field references to:
[a]
The nearest established street
lines and monuments, which shall be accurately described in the plat
by location, and size.
[b]
Township and section lines if the
same are within the boundary of the final plat or within 100 feet
(30 m) therefrom, referenced accurately to the lines of the subdivision
by distances and angles; this requirement may be waived for resubdivision
of existing final platted lots. This not needed for the survey and
are not readily recoverable.
[c]
All monuments placed at all block
corners, angle points and at intermediate points installed in such
a manner that they may be located by a professional land surveyor.
[d]
Reference survey to at least two
GIS monuments if available as recorded in order to incorporate plat
into GIS-based mapping. This requirement may be waived for resubdivision
of existing platted lots of record.
[10]
A signed statement by an Illinois professional
land surveyor stating which lots (if any) are located within a special
flood hazard area.
(c)
Certificates. The final plat shall be accompanied
by the following certificates duly and appropriately executed in substantially
the form presented in the Appendix of the exhibit specified:[5]
[1]
Owners, with notary: Exhibits A1, A2, and A3.
[5]
Editor's Note: The Exhibits are included at the end of this chapter.
(3)
Final plat submittal. The owner shall submit to the
City Clerk two reproducible Mylar, four paper and one digital computer-aided
drafting file copy (to be consistent with current GIS requirements)
of the final plat in the format and providing all information required
by this chapter.
A.
Technical specifications shall be submitted with the
public improvement engineering plans and shall be complete in themselves,
except that appropriate specific sections of the most recent editions
of the Standard Specifications for Road and Bridge Construction as
published by the Illinois Department of Transportation, and the Standard
Specifications for Water and Sewer Main Construction in Illinois,
and the various standard published material specifications prepared
by associations such as the American Society for Testing and Materials
and the American Water Works Association may be incorporated by reference.
B.
The specifications shall include (but not be limited
to) all information not shown on the drawings which is necessary to
establish in detail the quality of materials and workmanship required
in the project, other parameters for testing the various parts of
the project and instructions for testing material and equipment.
C.
The specifications shall include clauses which state:
(1)
All work shall be in conformance with the approved
plans and specifications.
(2)
All work included in the plans shall be guaranteed
by the contractor to be free from defects in workmanship and materials
for a period of 12 months from the date of acceptance by the City
Council.
(3)
The contractor shall replace or repair any work or
material found to be defective or not in conformance within the guarantee
period upon written notice from the City Engineer.
D.
Special provisions specific to construction within
the City are specified in the various sections of this chapter and
are to be used as guide for the preparation of specifications to be
submitted to the City Engineer for review and approval.
A.
Design computations shall be made by the design engineer
for all phases of the project when such computations are required
by this section or in the opinion of the City Engineer to ensure that
the adequacy and stability of the work and the work comply with appropriate
standards. Said computations shall be neat and legible and in a form
required by this section and that can be readily followed and understood
by a competent engineer.
B.
Said computations will include (but not necessarily
be limited to) the following:
(1)
(2)
Submitted with public improvement engineering plans.
Detailed design calculations for the following:
(a)
Detention/Retention basin design.
(b)
Storm sewer system design.
(c)
Sanitary sewer system design.
(d)
Flood routing and waterway design.
(e)
Bridge and culvert hydraulic design (if necessary).
(f)
Structural design data for pavement of minor
commercial, collector and major streets.
(g)
Traffic projections.
C.
Form and content for each set of detailed design computations
submitted with public improvement engineering plans and final subdivision
plats are specified in the following sections:
|
Design Computation
|
Section
| |
|---|---|---|
|
Coordinate geometry calculations for right-of-way
|
§ 195-65
| |
|
Boundary closure calculations
|
§ 195-65
| |
|
Lot corner coordinate data
|
§ 195-65
| |
|
Detention/Retention basin design
|
§ 195-68
| |
|
Storm sewer system design
|
§ 195-68
| |
|
Flood routing and open channel design
|
§ 195-68
| |
|
Sanitary sewer design
|
§ 195-74
| |
|
Bridge and culvert hydraulic design
|
§ 195-72
| |
|
Sediment and erosion control
|
§ 195-75
|
The design engineer shall prepare a detailed
estimate of the cost of the work, categorized to show the various
divisions of the work, including engineering costs as a separate item,
itemized in such a fashion as to make possible a comparison of the
estimated cost with actual cost encountered for similar work in the
past.
A.
Estimates of cost will be required as follows:
(1)
At the submittal of public improvement engineering
plans and specifications to the City Engineer for approval.
(2)
Prior to release of funds from escrow accounts posted
as security for payment, performance, and workmanship guarantees by
the City Engineer.
(3)
Prior to release of funds from cash reserve accounts
posted as security for adjacent substandard roadway improvement guarantee
and security by the City Engineer.
(4)
Submittal of final subdivision plat for approval.
B.
An example form of estimate of cost is provided as
Exhibit N in the Appendix of this chapter.[1]
[1]
Editor's Note: Exhibit N is included at the end of this chapter.
Other governmental agencies may review and approve
for construction all or certain parts of the work included in a project
and may require a permit or application for a permit for such work.
They may also require that such a permit or application for a permit
be executed by the City. When such a permit or permit application
is required, it shall be prepared, ready for signatures, containing
all required supporting documentation, by the design engineer with
sufficient copies for the City to retain one.
A.
These documents requiring City approval shall be submitted
by the design engineer to the City Engineer, with a letter of transmittal
tabulating the items being submitted. The documents to be approved
and the number required by the City are set out below. The design
engineer shall add to the documents the quantity he/she would like
returned to him/her marked "approved" on their face or, in the case
of permit applications, executed by the City for submittal to other
agencies.
B.
The submittal shall be made in two parts. The initial
submittal should be made and returned to the design engineer prior
to the final submittal.
(1)
Approval of the public improvement engineering
plans and specifications by the City Engineer shall be applicable
for a period for which there is a valid preliminary subdivision plan.
If construction is not commenced within said period, the approval
will be void. Reactivation of such voided approvals will require a
written request for extension, which will be considered with due consideration
for any new requirements that may be established by the City in the
interim.
Where proposed work is being constructed by
a developer, the developer shall guarantee that all work in the project
shall be free from defects in workmanship and materials and in conformance
with the approved plans and specifications.
A.
Prior to the City Engineer transmitting his approval
of the public improvement engineering plans and specifications and
prior to the recording of the final plat, the developer shall pay
to the City a fee of 2% of the approved estimated costs of such improvements.
Said fee shall be applied as credit against the actual costs incurred
by the City for review of said plans, coordination meetings, and the
inspection and testing of said improvements.
B.
The actual costs shall be paid to the City by the
developer on a monthly basis as costs are incurred until review and
inspection have been completed.
Any deviations from approved plans or specifications
affecting capacity, stability or operation of the improvements shall
be approved in writing by the City Engineer before such changes are
made. Minor changes not affecting capacity, stability or operation
of the improvements will not require formal approval but must be approved
by the field inspector representing the City Engineer.
Prior to construction commencing, the design
engineer may arrange with the City Engineer to set and conduct a preconstruction
meeting with representatives of contractors and utility companies
present.
A.
The design engineer shall submit to the City Engineer,
within nine months of the City's acceptance for maintenance, record
drawings of the public improvement engineering plans. Final release
of the subdivision bond will not be made until the record drawings
have been received by the City Engineer. Record drawings submitted
shall be one set of clear and legible transparent Mylar and one set
of photostatic prints of the underground improvement plans and one
digital computer-aided drafting file in accordance with this article
(to be consistent with current GIS requirements), approved and depicting
the improvements as actually installed or constructed.
B.
The design engineer will receive from the Water and
Street Department all inspection reports required to prepare the record
drawings adequately. The inspection reports will be available to the
design engineer after the improvements have been inspected and tested.
Prior to the City Engineer recommending that
the City accept the project for maintenance, the City Engineer shall
make a final inspection of the completed work. The City Engineer shall
then prepare a final punch list, itemizing all items not meeting the
requirements of the approved plans and specifications. On the completion
of all items listed in the final punch list to the satisfaction of
the City Engineer, the City Engineer shall recommend in writing to
the Mayor that the City accept the project for maintenance.
Where conditions so warrant, the Mayor may waive
any of the requirements of this chapter.
A.
Purpose. The purpose of these specifications is to
provide a standard for the transfer media and the format of the data
files for submission to the City Engineer and McLean County Regional
Planning Commission. The goal is to save the City, consultants and
developers time and money by providing a set of CAD (computer-aided
drafting) standards that will allow for easier referencing and combining
of files from one or more designs or sets of field data. By following
these standards, files will be uniform, allowing for quicker access
and editing of files produced at any time or by different people.
It will also allow the McLean County Regional Planning Commission
to automate the process of adding data to a GIS (geographic information
system).
B.
Electronic files required. The electronic files submitted
will be used for two purposes:
(1)
GIS update. This requires the plat or project to be a homogenous continuous design based in State Plane Coordinates as outlined below in Subsection D. Notes are not needed.
(3)
Record drawings of public improvement engineering
plans (including title page, grading plan, drainageway, street, sidewalk
and trail (except cross sections), storm sewer, sanitary sewer, water
main, streetlights, sump pump, structures).
(4)
Electronic files are required for record drawings
and final plats for subdivisions approved under the expedited procedure.
C.
Media. Files may be submitted on DVD or CD-ROM. Files
may be zipped as long as they are self-extracting or the extraction
utility is provided. All files and media are to be in an IBM-compatible
format.
D.
CAD standard. This CAD (computer-aided drafting) standard
is based on the IDOT (Illinois Department of Transportation) drafting
standards where feasible. Files submitted shall be MicroStation DGN
files or AutoCAD DWG Version 2000 or later. The files shall have the
following properties:
(1)
The actual working plat or design project shall use
Illinois State Plane East Zone Metric coordinates, USGS Zone 3776,
FIPS Zone 1201; projection will be Transverse Mercator. The USGS datum
will be horizontal NAD 83 and vertical NGVD 29. The plat or project
shall properly edge match to adjoining plats or design.
(2)
Files shall be 3D design files for plans and 2D design
for plats. Individual pages such as title page or typical sections
may be 2D design files.
(3)
If CAD files are converted from English units to metric
units, use 0.3048 foot/meter for conversion. English units are required
unless otherwise approved by the City in writing.
(4)
If using AutoCAD DWG files, the following applies:
All unused blocks shall be purged from AutoCAD files.
(5)
If using MicroStation DGN files, the following apply:
(a)
The global origin shall be set to the lower
left of the design file.
(b)
Working units shall be English unless metric
is required. For metric: 1,000 subunits (mm) per master unit (m);
one subunit per positional unit. Master units shall be designated
"m" for "meters." Subunits shall be designated "mm" for "millimeters."
(c)
Reference files used shall be in the same subdirectory
as the active design file. The attachment of the reference files done
shall be set with "Save Full Path" off.
(d)
Design files shall be compressed, to remove
deleted elements, before submittal.
(e)
Element attributes/symbology shall be in accordance
with the following table.
|
Feature Type
|
Feature Description
|
Layer Name
|
Color
|
Line Type
|
|---|---|---|---|---|
|
Alignment
|
Street Center Line
|
Street CL
|
1
|
Continuous
|
|
Vegetation
|
Orchard
|
Orchard
|
84
|
Dashed4
|
|
Tree
|
Tree
|
84
|
Continuous
| |
|
Woodland
|
Woodland
|
84
|
Dashed2
| |
|
Water
|
Detention Basin
|
Detention
|
153
|
Hidden2
|
|
Lake
|
Lake
|
143
|
Stream
| |
|
Lake Body Hidden
|
Lake_H
|
143
|
Hidden2
| |
|
River
|
River
|
143
|
Stream
| |
|
River Hidden
|
River_H
|
143
|
Hidden2
| |
|
Stream
|
Stream
|
143
|
Stream
| |
|
Stream Hidden
|
Stream_H
|
143
|
Hidden2
| |
|
Swamp
|
Swamp
|
143
|
Hidden2
| |
|
Right-of-Way
|
Access Control Fence
|
AC-Fence
|
43
|
Custom
|
|
Easement
|
Easement
|
43
|
Custom
| |
|
Marker
|
Marker
|
43
|
Continuous
| |
|
Street Limits
|
Str_Limit
|
40
|
Continuous
| |
|
Street Name Annotation
|
Str_Anno
|
3
|
Continuous
| |
|
Non-Highway
|
Area Unclassified
|
Area_UC
|
32
|
Dashed2
|
|
Athletic Field
|
Athlfield
|
72
|
Dashed
| |
|
Basketball Court
|
Bbcourt
|
72
|
Dashed2
| |
|
Building
|
Building
|
141
|
Continuous
| |
|
Building Annotation
|
Build_Anno
|
3
|
Continuous
| |
|
Cemetery
|
Cemetery
|
41
|
Dashed
| |
|
Concrete Plant
|
Concplnt
|
41
|
Dashed2
| |
|
Fence
|
Fence
|
192
|
Custom
| |
|
Golf Course
|
Golf Course
|
72
|
Dashed
| |
|
Junkyard
|
Junkyard
|
41
|
Dashed
| |
|
Landfill
|
Landfill
|
41
|
Dashed
| |
|
Multi-Use Trail
|
Trail
|
90
|
Dashed
| |
|
Paved Airport Runway
|
Runway_Pvd
|
152
|
Continuous
| |
|
Pool
|
Pool
|
170
|
Continuous
| |
|
Quarry
|
Quarry
|
41
|
Dashed
| |
|
Recreation Park
|
Park
|
93
|
Dashed2
| |
|
Silo
|
Silo
|
142
|
Continuous
| |
|
Storage Pile
|
Pile
|
141
|
Dashed2
| |
|
Storage Tank
|
Stor_Tank
|
141
|
Continuous
| |
|
Tennis Court
|
Tennis
|
72
|
Dashed2
| |
|
Water Tower/Tank
|
Water_Tank
|
141
|
Continuous
| |
|
Political Boundaries
|
Corporate Boundary
|
Corp_Bndy
|
6
|
Custom
|
|
County Boundary
|
County_Bndy
|
5
|
Custom
| |
|
Municipal Boundary
|
Municipal_Bndy
|
6
|
Custom
| |
|
Township Boundary
|
Township_Bndy
|
4
|
Custom
| |
|
Ward Boundary
|
Ward_Bndy
|
3
|
Custom
| |
|
Traffic Signals
|
Traffic Signals
|
Traffic_Sgnl
|
4
|
Continuous
|
|
Private Boundaries
|
Existing Subdivision Lines
|
Sub_Exist
|
3
|
Dashed4
|
|
Lot Number
|
Lot_No
|
5
|
Continuous
| |
|
Outlots
|
Outlot
|
4
|
Continuous
| |
|
Owner Name
|
Owner_Name
|
3
|
Continuous
| |
|
Property Line
|
Prop_Line
|
4
|
Continuous
| |
|
Property Line Dimensions
|
Prop_Dims
|
3
|
Continuous
| |
|
Property Line Symbol
|
Prop_Sym
|
3
|
Continuous
| |
|
Property Pins/Pipes
|
Prop_Pin
|
3
|
Continuous
| |
|
Same Ownership Symbol
|
Owner_Same
|
3
|
Continuous
| |
|
Section Corners
|
Sec_Cor
|
5
|
Continuous
| |
|
Subdivision Annotation
|
Sub_Anno
|
3
|
Dashed2
| |
|
Subdivision Line
|
Sub_Line
|
6
|
Continuous
| |
|
Survey Markers
|
Survey_MK
|
3
|
Continuous
| |
|
Existing Utilities
|
Communication Tower
|
Tower_Comm
|
54
|
Continuous
|
|
Cross-Country Pole
|
Pole_CC
|
54
|
Continuous
| |
|
Cross-Country Transmission Line
|
Pwr_Trns_Line
|
54
|
Continuous
| |
|
Cross-Country Transmission Tower
|
Tower_Trns
|
54
|
Continuous
| |
|
Fire Hydrant
|
Fire_Hyd
|
170
|
Continuous
| |
|
Manhole Combination
|
MH_Comb
|
100
|
Continuous
| |
|
Manhole Sanitary
|
San_MH
|
100
|
Continuous
| |
|
Manhole Storm
|
Storm_MH
|
100
|
Continuous
| |
|
Sewer Combination
|
S-Comb
|
100
|
Continuous
| |
|
Sewer Sanitary Main
|
San_Main
|
100
|
Continuous
| |
|
Sewer Storm Main
|
SS_Main
|
100
|
Continuous
| |
|
Substation
|
Substation
|
54
|
Continuous
| |
|
Water Main
|
W_Main
|
170
|
Continuous
| |
|
Water Main Valve
|
Valve_W
|
170
|
Continuous
| |
|
Water Service Valve
|
Ser_Valv_W
|
170
|
Continuous
| |
|
Notes
|
Alignment Annotation
|
Align_Anno
|
3
|
Continuous
|
|
Drainage Structures Annotation
|
Drain_Str_Anno
|
3
|
Continuous
| |
|
Topography Annotation
|
Topo_Anno
|
3
|
Continuous
| |
|
Utility Annotation
|
Util_Anno
|
3
|
Continuous
| |
|
Roadside Features
|
Driveway
|
Driveway
|
4
|
Continuous
|
|
Paved Parking Area
|
Parking_Pvd
|
4
|
Dashed
| |
|
Retaining Wall
|
Wall_Rtn
|
4
|
Custom
| |
|
Sidewalk
|
Sidewalk
|
4
|
Custom
| |
|
Unpaved Parking Area
|
Parking_Unp
|
4
|
Dashed2
| |
|
Wall
|
Wall
|
4
|
Dashed
| |
|
Contours
|
Index Contour Line
|
Indx
|
43
|
Continuous
|
|
Index Contour Depression
|
Indx_D
|
43
|
Dashed
| |
|
Index Contour Depression Hidden
|
Indx_DH
|
43
|
Dashed2
| |
|
Index Contour Hidden
|
Indx_H
|
43
|
Hidden
| |
|
Index Contour Obscure
|
Indx_O
|
43
|
Hidden2
| |
|
Index Contour Obscure Depression
|
Indx_OD
|
47
|
Hidden
| |
|
Index Contour Obscure Depression Hidden
|
Indx_Odh
|
47
|
Hidden2
| |
|
Index Contour Obscure Hidden
|
Indx_OH
|
47
|
Hidden4
| |
|
Intermediate Contour Line
|
Int
|
53
|
Continuous
| |
|
Intermediate Contour Depression
|
Int_D
|
53
|
Dashed
| |
|
Intermediate Contour Depression Hidden
|
Int_DH
|
53
|
Dashed2
| |
|
Intermediate Contour Hidden
|
Int_H
|
53
|
Hidden
| |
|
Intermediate Contour Obscure
|
Int_O
|
53
|
Hidden2
| |
|
Intermediate Contour Obscure Depression
|
Int_OD
|
57
|
Hidden
| |
|
Intermediate Contour Obscure Depression Hidden
|
Int_Odh
|
57
|
Hidden2
| |
|
Intermediate Contour Obscure Hidden
|
Int_OH
|
57
|
Hidden4
| |
|
Edge of Pavement
|
Alley
|
Alley
|
2
|
Continuous
|
|
Controlled Access
|
Access_Cntl
|
62
|
Custom
| |
|
Paved Road Back of Curb
|
Road_Boc
|
6
|
Continuous
| |
|
Paved Road Back of Curb Hidden
|
Road_Boch
|
6
|
Hidden
| |
|
Paved Road Edge of Pavement
|
Road_Eop
|
5
|
Continuous
| |
|
Paved Road Edge of Pavement Hidden
|
Road_Eoph
|
5
|
Hidden
| |
|
Road Uncontrolled Access
|
Road_UC
|
41
|
Hidden2
| |
|
Road Under Bridge
|
Road_H
|
6
|
Hidden
| |
|
Unpaved Road
|
Road_Unp
|
5
|
Dashed
| |
|
Unpaved Road Hidden
|
Road_Unph
|
5
|
Dashed2
| |
|
Roadway Plan
|
Paved Median
|
Median_Pvd
|
6
|
Continuous
|
|
As - Control
|
FAAT Passpoints
|
Faatpp
|
3
|
Continuous
|
|
Horizontal and Vertical Control Points
|
Hvpt
|
3
|
Continuous
| |
|
Horizontal Control Points
|
Hpt
|
3
|
Continuous
| |
|
Vertical Control Points
|
Vpt
|
3
|
Continuous
| |
|
As - Spot Elevations
|
Digital Terrain Model Breakline
|
Dtm_Bline
|
1
|
Continuous
|
|
Digital Terrain Model Point
|
Dtm_Point
|
1
|
Continuous
| |
|
Spot Elevation
|
Spot
|
3
|
Continuous
| |
|
Water Elevation
|
Spot_Water
|
3
|
Continuous
| |
|
As - Grid
|
200-Meter Ticks (Ill. St. Plane East)
|
Ticks_M
|
4
|
Continuous
|
|
St. Plane Ticks (Along Section Lines)
|
Ticks_F
|
3
|
Continuous
| |
|
As - Map Limits
|
Map Mask and Title
|
Mask
|
7
|
Continuous
|
|
Section Lines
|
Sec_Line
|
5
|
Custom
| |
|
Existing Drainage
|
Concrete Dam
|
Dam_Conc
|
13
|
Continuous
|
|
Ditch
|
Ditch
|
12
|
Hidden2
| |
|
Floodwall/Headwall
|
Floodwall
|
131
|
Continuous
| |
|
Floodway
|
Floodway
|
145
|
Continuous
| |
|
Pier
|
Pier
|
131
|
Continuous
| |
|
Railroad
|
Abandoned Railroad
|
RR_Abnd
|
41
|
Continuous
|
|
Railroad Annotation
|
RR_Anno
|
3
|
Continuous
| |
|
Railroad Center line
|
RR
|
4
|
Continuous
| |
|
Railroad Center line Hidden
|
RR_H
|
4
|
Hidden2
| |
|
Structures
|
Bridge Deck Boundary
|
Bridge
|
5
|
Continuous
|
|
Major Culvert
|
Culvert
|
140
|
Continuous
| |
|
Coordinate Data
|
Illinois State Plane Coordinate Data, English
|
Spc_E
|
7
|
Continuous
|
|
Illinois State Plane Coordinate Data, Metric
|
Spc_M
|
7
|
Continuous
|
A.
Public improvements required in connection with a
subdivision or development are often in or adjacent to areas with
existing surface or underground improvements. The intent of this section
is to codify special City requirements relative to the construction
of proposed improvements and restoration of existing improvements
affected by the construction. Plans and specifications presented for
City approval shall provide for the implementation of the requirements
of this section.
B.
Specifications and special provisions. All public
improvement projects shall be completed in accordance with all applicable
sections of the most current editions of the Illinois Department of
Transportation's Standard Specifications for Road and Bridge Construction,
and the Standard Specifications for Water and Sewer Main Construction
in Illinois and any amendments, additions or other requirements contained
herein.
(1)
Protection.
(a)
Traffic control.
[1]
All work within the public ROW shall be completed
in accordance with the latest edition of the Manual on Uniform Traffic
Control Devices (MUTCD) as published by IDOT. The provisions of this
Manual will be enforced whenever work is in progress within the existing
roadway or adjacent to it or as required by the City Engineer.
[2]
Lane closures will be required whenever construction
is performed or vehicles are parked in a lane normally used for through
traffic. Written permission for all lane closures must be obtained
from the Water and Street Department and the Police Department. On
major and collector streets, one lane for each direction shall be
maintained open to traffic except during the actual excavating and
laying operations. No more than 1/2 the width of the street may be
closed to traffic during the construction and curing of the permanent
pavement patch.
[3]
Required traffic control signing shall be in
strict conformance with the Manual cited above and/or as shown on
the plans. No construction shall commence until such time as all required
signs and barricades have been erected. The contractor shall also
be responsible for contacting police, fire and any public transportation
authorities.
(b)
Bracing and sheeting. Open-cut trenches shall
be sheeted and braced as required by any governing federal or state
laws and municipal ordinances, and as may be necessary to protect
life, property and the work.
(c)
Trench side slopes. The contractor may, where
working conditions and the right-of-way permit, excavate pipe line
trenches with sloping sides above the top of the conduit only.
(d)
Tunneling. The contractor may utilize short
tunnels to avoid obstructions such as trees, fire hydrants, sidewalks
and curbs.
(e)
Stockpiling of excavated material. All excavated
material shall be stockpiled such that it will not endanger the work
and will avoid obstructing streets, sidewalks, driveways, watercourses,
fire hydrants, valve pit covers, valve boxes, curb stops and other
utility controls.
(f)
Protection of property and structures. Any existing
or new property or structures disturbed or damaged during construction
shall be replaced or repaired to the satisfaction of the owner, at
the contractor's expense.
(g)
Utilities.
[1]
The utility companies shall be notified of a
proposed project, and the plans should indicate the general location
of the utility main lines. It shall be the contractor's responsibility,
before beginning any construction, to obtain from all utilities the
exact locations of all underground facilities in the area of construction,
whether shown on the plans or not. Any facilities disturbed by the
contractor shall be repaired at the contractor's expense.
[2]
Residents and businesses shall be notified a
minimum of 24 hours in advance of impending service outages, and no
business or residence shall be without service overnight.
(h)
Work place safety. Nothing in this section is
intended or shall be construed to reduce the responsibility of the
contractor, a subcontractor, anyone directly or indirectly employed
by him, or anyone for whose acts he may be liable from full and complete
supervision and achievement of workplace safety. Any inspection of
the work conducted by the City Engineer, or his/her designated representatives,
whether notice of the results thereof is provided to anyone or not
provided to anyone, shall neither establish any duty on their parts
nor create any expectation of a duty to anyone, including but not
limited to third parties, regarding workplace safety.
(2)
Restoration of public facilities. The contractor shall
restore all pavements, sidewalks, driveways, curbs, buffers, trees,
shrubs, lawns, fences, poles and other structures and property removed
or disturbed during or as a result of construction operations to a
condition which is equal in appearance and quality to the condition
that existed before the work began.
(a)
Removal of pavements, sidewalks, curbs, gutters,
and driveways. All removal shall be completed in accordance with all
applicable sections of the Standard Specifications for Road and Bridge
Construction and any special provisions contained herein. When removal
is required for the installation of a conduit, the width of the removal
shall exceed the actual trench width by one foot (1/3 m) on each side.
Removal of PCC sidewalk, PCC pavement, PCC driveways, PCC curb and
gutter shall be to the nearest joint unless otherwise directed by
the City Engineer.
(b)
Replacement of pavements, sidewalks, curbs,
gutters, and driveways. All replacements shall be completed in accordance
with all applicable sections of the Standard Specifications for Road
and Bridge Construction and any special provisions contained herein.
For all PCC replacements, concrete meeting the requirements of the
Standard Specifications for Road and Bridge Construction shall be
used.
[1]
Pavement removal and replacement Type A, B,
C and D.
[a]
Pavement shall be removed and replaced
according to the following standards.
[b]
Types of patching. The type of
patching required shall depend upon the existing pavement:
[i]
Type A patches shall apply to pavements
that have existing aggregate base and bituminous surface.
[ii]
Type B patches shall apply to
pavements that have existing concrete base and bituminous surface,
brick base and bituminous surface or bituminous base and bituminous
surface.
[iii]
Type C patches shall apply to
existing pavements that have existing brick surface or concrete surface.
Reinforcement will be required where the existing pavement is presently
reinforced.
[iv]
Type D patches shall apply to
existing pavements that have existing brick surface that the City
has designated to be preserved.
[2]
Driveway replacement. The type of replacement
required shall depend on the existing pavement:
[a]
Type A existing concrete driveway
shall be replaced with a new minimum 150 mm (six inches) portland
cement concrete surface.
[b]
Type B existing bituminous surface
driveway shall be replaced with a new minimum 200 mm (eight inches)
thick aggregate base and minimum 76 mm (three inches) thick bituminous
concrete surface.
[c]
Type C existing crushed stone driveway
shall be replaced with a new minimum 200 mm (eight inches) thick crushed
aggregate surface with the top 100 mm (four inches) being the same
material as the existing.
[3]
Sidewalk replacement. Sidewalk shall be replaced
to the same depth and width as the existing unless otherwise directed
by the City Engineer; 12 mm (1/2 inch) thick preformed expansion joints
shall be placed at locations abutting existing work and at fifteen-meter
(fifty-foot) intervals in the new walk.
[4]
Curb and gutter replacement. Curb and gutter
shall be replaced to the dimensions and cross section of the existing;
12 mm (1/2 inch) thick preformed expansion joints shall be placed
at the junction of new and existing work and at all points of curvature.
[5]
Removal limits.
[a]
The limits of the pavement repair
shall be saw cut in a rectangular pattern to a depth of not less than
three inches (75 mm). Type A patches shall be a minimum of three feet
(one m) in width. Type B and Type C patches shall be a minimum of
five feet (two m) in width. For Type B and Type C patches, the new
pavement shall be shouldered one foot (1/3 m) minimum on either side
of the trench on undisturbed ground.
[b]
Whenever a series of Type A or
Type B patches is made in such a manner as to leave less than five
feet of undisturbed bituminous surface between adjacent patches, it
shall be required that the bituminous surface between the patches
be removed and the entire area resurfaced.
[c]
PCC pavements not in good condition
shall be repaired in accordance with typical detail shown for Type
C patching. Whenever a pavement patch is less than 1.5 meters (five
feet) from the pavement edge, contraction joint, crack, etc., the
pavement patch shall be enlarged to meet the edge, joint or crack
and the entire excavated area paved as one patch. The limits of pavement
removal on Type D patching shall be in such a manner that whole bricks
will be used in the replacement and that the replaced brick course
extends beyond the limits of the concrete base course.
[6]
Trench backfill. All utility trenches on minor
streets shall be backfilled with trench backfill. Material for trench
backfill shall comply with the latest edition of the Standard Specifications
for Road and Bridge Construction in Illinois, except that the maximum
aggregate size shall be 75 mm (three inches). Approved compacted granular
material shall be required in all trenches extending two feet either
side of all sidewalks, curbs, gutters, driveways and pavements. Trench
backfill shall be compacted by mechanical means in one-third-meter
(one-foot) lifts.
[7]
Jetting of trenches. Utility trenches on minor
streets may be compacted by jetting and allowed to dry before the
permanent base and surface course are constructed.
[8]
Controlled low-strength material. All utility
trenches on collector and major streets shall be backfilled with controlled
density fill from 1/3 meter (one foot) above pipe to bottom of subgrade.
Controlled density fill shall meet the requirements of the Standard
Specifications for Road and Bridge Construction.
[9]
Temporary asphalt surface. After completion
of backfilling the excavation, a temporary asphalt surface shall be
placed as soon as possible or as directed by the City Engineer with
a minimum thickness of two inches (50 mm). This surface shall be maintained
by the excavation contractor until the permanent patch is constructed.
Steel plates may be used for Type B patches to bridge the utility
trench patch during the curing period for the PC concrete base course
in order to open the traffic lane to traffic during this period.
(c)
Field; drain tile. All existing drain tile lines
which cross the trench of a proposed sanitary sewer, storm sewer,
water main and services shall be accurately recorded and marked in
the field by the contractor. Upon completion of the installation of
the underground utilities, the contractor shall furnish a copy of
all drain tile locations to the City Engineer. The Engineer shall
analyze these locations and all tiles should be reconnected. All existing
drain tile lines crossing the proposed street rights-of-way shall
be removed from a point six feet (two m) beyond the right-of-way on
each side. All drain tile lines reconstructed or connected to the
storm sewer system shall be constructed of either PVC water main with
slip-on joints (up to 12 inches) (300 m) or reinforced concrete storm
sewer pipe of Class 3 or Class 4 as required by depth in accordance
with the Standard Specifications for Road and Bridge Construction.
Drain tiles to be reconnected shall be repaired so that their carrying
capacity shall not be impaired. Drain tile shall be repaired with
PVC SDR 26 pipe, a minimum of two inches (50 mm) larger diameter than
the severed tile. The length of the plastic pipe shall be such that
it bears a minimum of two feet (213 m) on undisturbed soil on each
side of the trench, with each field tile to plastic pipe junction
encased in concrete. All repairs shall be inspected and approved by
the City Engineer prior to backfilling. Compacted granular backfill
shall be required if under a street or sidewalk. The plastic pipe
to drain tile junction shall be wrapped with burlap or other material
approved by the City Engineer prior to encasement to prevent concrete
from entering the flow line of the pipe. For drain tile under streets,
the use of concrete or ductile iron pipe is required.
(d)
Restoration of vegetative areas. All vegetative
areas disturbed during construction shall be restored by furnishing
and placing topsoil to a minimum depth of four inches (100 mm) and
seeding of the area in accordance with the Standard Specifications
for Road and Bridge Construction or as directed by the Engineer.
(e)
Cleanup. Before acceptance of underground conduit
construction, all pipes, manholes, catch basins, hydrants and other
appurtenances shall be cleaned of all debris and foreign material.
(3)
Special provisions modifying Standard Specifications
for Water and Sewer Main Construction in Illinois.
(a)
Construction in easements. The top six inches
(150 mm) of any ground disturbed due to construction on private property
in an inhabited area shall be replaced with topsoil and restored to
its original condition at no additional cost to the owner.
(b)
Agricultural surface restoration.
[1]
At locations as shown on the plans or designated
by the Engineer, the contractor shall restore any and all agricultural
areas. Prior to the installation of the proposed pipes, the contractor
shall remove all topsoil from the construction area and stockpile
it along the edge of the working limits.
[2]
Upon the completion of the installation of the
pipes and placing of the subsoil backfill, the contractor shall replace
the original topsoil over the top of the disturbed area so that the
finished surface shall be level and smooth and contain all of the
original topsoil at approximately the same depth as prior to construction.
(c)
Removal of soil from agricultural areas. No
soil will be removed from the areas designated for agricultural surface
restoration unless the owner or his representative gives written consent.
C.
Standard details for the following are included at the end of this chapter:
|
Drawing No.
|
Title
| |
|---|---|---|
|
A
|
Pavement Patching Details Types A, B and C
| |
|
B
|
Pavement Patching Detail Type D
| |
|
C
|
Drain Tile Repair Detail
|
A.
All subdivisions shall be designed to conform with
the planning principles, layout and design requirements of this section.
These principles and design requirements concern entire systems rather
than individual elements of the system, and so express concepts rather
than specific standards. Specific standards are elaborated in other
sections of this ordinance.
B.
Subdivision principles of planning.
(1)
Basic principles exist which should be recognized
and heeded in designing circulation and access systems in new subdivisions
of conventional layout. Basic consideration in the design of minor
circulation systems must recognize the factors of:
(2)
Each of the following principles is an elaboration
on one or more of these four factors. The principles are not intended
as absolute criteria, since instances may appear where certain principles
conflict. The principles should, therefore, be used as guides to proper
systems layout.
(a)
Adequate vehicular and pedestrian access should
be provided to all parcels.
(b)
Minor street systems should be designed to minimize
through-traffic movements.
(c)
Street patterns should minimize out-of-the-way
vehicular traffic.
(d)
Minor street systems should be logical and comprehensible;
street names should be simple, consistent, understandable, and not
duplicate existing street names.
(e)
Minor circulation systems and land development
patterns should not detract from the efficiency of major and collector
streets.
(f)
Elements in the minor circulation system should
not have to rely on extensive traffic regulation in order to function
efficiently and safely.
(g)
Traffic generators within residential areas
should be considered in the minor circulation pattern.
(h)
Planning and construction of minor streets should
clearly indicate their function.
(i)
The minor street system should be designed for
a relatively uniform low volume of street traffic.
(j)
Minor streets should be designed to discourage
excessive speeds.
(k)
Pedestrian-vehicular conflict points should
be minimized.
(l)
An optimum amount of space should be devoted
to street uses.
(m)
The arrangement of minor streets should permit
economical and practical patterns, shapes and sizes of development
parcels.
(n)
Minor streets should be related to topography
from the standpoint of both economics, drainage and amenities.
(o)
Open space areas should be provided, commensurate
with the projected population density of the development.
(p)
Major elements of the street system may be used
to help define and buffer different land use areas, enhancing their
identity and cohesiveness.
(q)
The street and pedestrian circulation pattern
in a new residential subdivision shall be compatible with the City's
Comprehensive Plan.
(r)
Subdivision layout should optimize the overall
length of streets.
(s)
A residential area should be conveniently accessible
from major and collector streets.
(t)
Access points to major and collector street
facilities should be limited in number, given special design consideration,
and, whenever possible, located where other features are not competing
for driver attention.
(u)
Driveway entrances should be prohibited on major
streets and, whenever possible, on collector streets in residentially
zoned areas.
(v)
Through-traffic on minor residential streets
should be avoided where practical.
(w)
Lot layout in residential subdivisions should
be designed to reduce the incidence of housing on major streets.
(x)
Public utilities, including water, storm sewer
and sanitary sewer facilities, should be existing or proposed by the
developer or the City of Lexington of a size adequate to serve the
proposed subdivision and any other future development they may be
required to service.
(y)
The general land use principles and planning
standards should be applied to the subdivision as contained in the
City of Lexington Comprehensive Plan.
(z)
Cul-de-sac streets shall not be allowed in order
to encourage more equal utilization of minor streets unless the City
Council grants a variance from this section.
(aa)
Where feasible, more than one entrance to a
subdivision shall be required.
(bb)
Where feasible, interconnection of adjoining
residential subdivisions shall be required.
C.
Layout and design requirements for proposed lots of
record and outlots.
(1)
Subdivisions shall consist solely and exclusively
of lots of record, outlots, easements, public rights-of-way and public
improvements.
(2)
All proposed lots of record shall front on and have
access to a public street or roadway.
(4)
Outlots may not be used for buildings or parking lots.
(5)
Rear, side and front yard easements shall be dedicated
to the City for use by the City and private utility companies (for
gas, electricity, cable TV, water, storm sewer or stormwater drainage,
sanitary sewer, etc.) as provided herein.
(6)
Where residential lots are platted abutting an major
street, the "back-up" treatment should be used and a "no-access" strip
depicted on those lots adjacent to the major street.
(7)
Boundaries of the subdivision shall be drawn to meet
or exceed the following standards:
(a)
Error of closure of boundary lines survey shall
not exceed 5,000 (1:5,000).
(b)
Angular error shall not exceed +/- 20 seconds.
(c)
Lot line dimensions shall be shown in meters
and thousandths (in feet and hundredths).
(d)
Angles occurring in any lot line between lot
corners shall be shown in degrees, minutes, and seconds.
(8)
In general, lots shall be as nearly rectangular in
shape as practicable.
(9)
Side lot lines shall generally be perpendicular to
the right-of-way.
A.
All lots in any subdivision, regardless of size, shall
front on and have access to a street. When necessary, streets shall
be included as part of the subdivision and shall be designed and constructed
in accordance with this section.
B.
General requirements. All subdivisions shall be designed
so the proposed street system accomplishes the following:
(2)
Extends major and collector streets through the proposed
subdivision.
(3)
Locates and aligns minor streets so that use by through
traffic is discouraged.
(4)
Avoids center-line offsets of less than 250 feet (75
m) from other streets or roadways for minor streets. For offsets from
major/collector streets, a more detailed engineering study may be
required.
(6)
Not more than two streets intersect at any point,
and the angle of intersection of center lines is not less than 80°
nor more than 100°.
(7)
In single-family zoning districts, culs-de-sac shall
not exceed 1,200 feet (365 m) in length or have more than 15 lots
fronting thereon, whichever imposes the more demanding standard; and
in multiple-family and two-family zoning districts, culs-de-sac shall
not exceed 400 feet (120 m) or have more than eight lots fronting
thereon, whichever imposes the more demanding standard.
(8)
Encourage safe and efficient traffic flow and provide
sufficient vehicular storage space for stopping and turning movements
so as not to conflict with traffic at intersecting streets or driveway
entrances.
(9)
In residentially zoned areas, access to any major
or collector street shall be provided every 1,200 feet (365 m) or
no more than 1,800 feet (550 m) as measured along the major or collector
street.
(10)
The minimum curb radius where two streets intersect
shall be 7.6 meters (25 feet) to face of curb. For major, collector,
and minor commercial streets, curb radii shall be sufficient to accommodate
the appropriate design vehicle in accordance with the Illinois Department
of Transportation Design and Environment Manual.
(11)
Cul-de-sac streets, if allowed, shall not be
constructed "back to back." (Backyards on one cul-de-sac may not be
adjacent to backyards of another cul-de-sac.)
(12)
Lots zoned R-1 shall have a minimum eighteen-meter
(sixty-foot) lot width measured at the building setback line if located
on the bulb of a cul-de-sac street.
(13)
Driveways shall not encompass more than 50%
of the curb on the bulb of a cul-de-sac street.
C.
Public street right-of-way dedication. All streets
and roadways proposed within the confines of a subdivision shall be
located in dedicated public or private rights-of-way as required by
this section. All streets are considered public unless specifically
stated that they are private on the preliminary plan and final plat.
(1)
Interior streets. Subdivisions shall be designed so
all interior streets are located within dedicated public rights-of-way
of the following minimum widths, depending on the street classification,
the volume of traffic and the zoning of the abutting property (Where
side streets abut two or more zoning districts, right-of-way dedication
shall be provided so as to meet the requirement of the more demanding
zoning district.):
|
Type of Street
|
R-1, R-2 Zoning Districts
|
B-1, B-2, M-1, M-2 Zoning Districts
| ||
|---|---|---|---|---|
|
Major
| ||||
|
Over 1,200 DV
|
96 feet (29 m)
|
96 feet (29 m)
| ||
|
Under 1,200 DHV
|
86 feet (26 m)
|
90 feet (27 m)
| ||
|
Collector
|
80 feet (24 m)
|
90 feet (27 m)
| ||
|
Minor
|
60 feet (18 m)
|
70 feet (21 m)
| ||
|
4-lane divided with median
|
100 feet (30 m)
|
100 feet (30 m)
| ||
|
Cul-de-sac (diameter) (if allowed)
|
100 feet (30 m)
|
120 feet (34 m)
| ||
|
Frontage roads
|
60 feet (18 m)
|
60 feet (18 m)
| ||
(2)
Expressways: in accordance with the Comprehensive
Plan of the City of Lexington or interstate standards and requirements
of the federal, state, county or township authorities having jurisdiction,
whichever has the greater right-of-way width requirement.
(3)
Interior streets. Subdivisions shall be designed so
all interior streets are located within dedicated rights-of-way of
the following minimum width:
(4)
Exterior streets. Subdivisions shall be designed so
that the subdivider provides not less than 1/2 the right-of-way dedication
required for a comparable interior street.
(5)
Supplemental dedication. Where the street design requirements
of this chapter require the provision of turning lanes, turning radii,
center median, traffic control devices or other installation which
cannot be installed within the right-of-way otherwise required by
this chapter without the elimination or conflict between such features
and other public improvements, the subdivider shall dedicate such
additional right-of-way as is necessary to accommodate all such improvements.
D.
Design standards.
(1)
Street width. Pavement width shall be based on street
classification, the expected traffic volume and the zoning district
(the more demanding standard shall apply) in accordance with the following:
|
Street
|
Pavement Width
(face to face of curb)
|
Median Street Width
| ||
|---|---|---|---|---|
|
Major
| ||||
|
Over 855 DHV
|
51 feet (15.4 m)
|
4 feet (1.2 m)
| ||
|
495 to 855 DHV
|
47 feet (14.1 m)
|
0
| ||
|
Under 495 DHV
|
36 feet (11.0 m)
|
0
| ||
|
Collector
| ||||
|
Over 495 DHV
|
47 feet (14.1 m)
|
0
| ||
|
Under 495 DHV
|
39 feet (11.0 m)
|
0
| ||
|
Minor
|
30 feet (9 m)
|
0
| ||
|
Frontage roads
|
30 feet (9 m)
|
0
| ||
|
Boulevards
|
2 @ 22 feet (2 @ 6.6 m)
|
10 feet (3 m)
| ||
|
One-way
|
24 feet (7.2 m)
|
0
| ||
|
Private street
| ||||
|
R-1 Zoning
|
30 feet (9 m)
24 feet (7.2 m) (if no parking allowed)
| |||
|
All other zoning
|
30 feet (9.0 m)
| |||
(2)
Pavement structure.
(a)
Structural strength shall be based on street
classification, the expected traffic volume and designed in accordance
with current editions of the following:
(b)
Minor streets shall be constructed with a minimum
of 250 mm (10 inches) of compacted crushed aggregate and 102 mm (four
inches) of bituminous concrete surface, or 150 mm (six inches) of
portland cement concrete, installed in accordance with Standard Specifications
for Road and Bridge Construction in accordance with the following
design and construction standards and specifications (Reference Table
195-67, included at the end of this section.):
(3)
Cul-de-sac terminus. Culs-de-sac are not allowed except
by special exception.
(4)
Vertical gradients. Differing connecting street gradients
shall be connected with vertical curves. The Design and Environment
Manual shall govern all vertical curve computations; except when the
algebraic difference of the gradient is less than 1%, a fifty-foot
vertical curve length shall be utilized. Desirable street gradients
shall not be less than a minimum of 0.50%. In no case shall the street
gradient be less than 0.40%.
(5)
Curb and gutter.
(a)
Curb and gutter shall be Type B-6.18 (B 15.45)
in accordance with the Illinois Department of Transportation Highway
Standards and installed in accordance with the Standard Specifications
of Road and Bridge Construction.
(b)
All curb and gutter shall be designed so as
to facilitate persons using wheelchairs to travel freely and without
assistance by providing at each crosswalk a ramp with nonslip surface
so that the sidewalk and street blend to a common level. Such ramp
shall be designed and constructed in accordance with the Highway Standards.
(6)
Trench backfill. Any excavation in an existing or
proposed street shall be backfilled with select granular, backfill
or controlled low-strength material.
E.
Specifications and special provisions. All streets
and curb and gutter shall be constructed in accordance with all applicable
sections of the Standard Specifications for Road and Bridge Construction
for the Illinois Department of Transportation, the current edition
as then modified, supplemented and amended by this section or the
City Engineer. These modifications, amendments and amplifications
have been provided in this section of the chapter.
(1)
Special provisions for streets.
(a)
Curb marking of water and sewer services. At the time the curb and
gutter is poured, the contractor shall mark the top of the curb with
an "S" or "W" for sewer and water services respectively.
(2)
Adjustment of frame of grate.
(a)
Final grade for all manhole castings will be
determined after the curb and gutter have been poured and the subgrade
and/or base has been constructed. Final adjustment of the frame and
grate shall be made in the following manner: After the curb and gutter
have been poured and the base constructed, the final elevation will
be determined by the City Engineer.
(b)
The frame and grate will be adjusted to this
elevation in accordance with the Standard Specifications for Road
and Bridge Construction. Any material disturbed while adjusting the
frame and grate will be disposed of and all fill made with lean concrete.
A maximum of eight inches of adjusting rings shall be allowed.
(3)
Coarse aggregate: shall comply with IDOT specifications.
(4)
Combination concrete curb and gutter.
(a)
Concrete curb and gutter shall be sawed or scored
at intervals coinciding with the joint intervals of the adjoining
pavement. The minimum joint depth for the gutter shall be two inches
(50 mm), and one inch (25 mm) for the curb. The curb and gutter may
be jointed instead of sawed, provided the stated joint depths are
obtained. If the curb and gutter are adjacent to bituminous pavement,
they shall be jointed at fifteen-foot (4.5 m) intervals.
(b)
The sawing of the curb and gutter shall commence
within four hours of the start of the pour unless otherwise directed
by the City Engineer. Sawing shall continue until all joints are completed.
(c)
Asphaltic-type expansion joints one inch (25
mm) thick shall be placed at all PCs, PTs and RPCs and at maximum
150 meter (500 foot) intervals.
(5)
Test rolling of subgrade and base course.
(a)
The contractor will provide at his own expense
a loaded truck and test roll the compacted earth subgrade in the presence
of the Engineer or his designee before any subbase, base, or surface
is placed. The truck shall be loaded as follows: 27,000 pounds (12,000
kg) on two axles and 45,000 pounds (20,000 kg) on three axles, plus
or minus 10%.
(b)
The truck shall make one pass over the entire
length of each traffic lane to be constructed. Areas which show ruffing,
cracking or rolling will not be accepted. The contractor will recompact
and/or reconstruct the sections that fail and test roll again for
acceptance.
(c)
When bituminous or concrete surface courses
are to be placed over an aggregate base, the base shall be test rolled
prior to placement of the surface course.
(6)
Portland cement concrete pavement.
(a)
Sawed transverse joints shall be not greater
than 15 feet apart and shall conform with the details in the plans.
All equipment and labor required to perform the necessary jointing
operation shall be available to begin sawing no later than four hours
after the paving operation begins, unless excess raveling occurs.
The contractor shall provide the necessary equipment and labor needed
to complete the sawing at the same rate per longitudinal foot as the
paving operation.
(b)
The contractor shall stop the paving operation
at 4:30 p.m., unless approved otherwise by the City Engineer. Sawing
shall continue at the same rate as stated above until the sawing is
complete or the pavement has set.
(c)
Trucks and mixer trucks will be allowed to operate
on the subgrade; however, should the subgrade show any signs of distress,
all operations will cease until these items are corrected to the satisfaction
of the Engineer. Curb and gutter is to be formed in a separate operation
from the pavement. Monolithic curb will not be permitted.
(d)
Final finish shall be Type B, as described in
the Standard Specifications for Road and Bridge Construction, artificial
turf drag.
(7)
Portland cement concrete driveway pavement.
(a)
Pavement shall be a minimum of six inches (150
mm) in depth. Sawed transverse and longitudinal joints shall conform
to the following table:
|
Driveway Width at Widest Point
(feet)
|
Number of Longitudinal Saw Cuts
| |
|---|---|---|
|
0 to 12 (0 m to 4 m)
|
0
| |
|
12 to 24 (4 m to 8 m)
|
1
| |
|
24 to 36 (8 m to 16 m)
|
2
|
|
Maximum Driveway Length
(feet)
|
Number of Transverse Saw Cuts
| |
|---|---|---|
|
0 to 12 (0 m to 4 m)
|
0
| |
|
12 to 24 (4 m to 8 m)
|
1
| |
|
24 to 36 (8 m to 16 m)
|
2
|
(b)
The sawed joints shall be spaced evenly throughout
the driveway. The joints shall be 1/8 inch (three mm) wide with a
minimum depth of 1/4 the depth of the pavement and sealed with the
same material and in the same manner as portland cement concrete pavement.
(c)
Three-fourth-inch (20 mm) thick expansion joints
shall be placed between driveway pavement and sidewalks and between
driveway pavement and curb and gutter.
F.
Standard details for the following are included at the end of this chapter:
|
Standard
|
Drawing Title
| |
|---|---|---|
|
A
|
Typical Pavement Section — Minor Street
| |
|
B
|
Standard Joint Details
| |
|
C
|
Barrier Curb and Gutter Detail
| |
|
D
|
Typical Intersection Joint Detail
| |
|
E
|
Typical Cul-de-Sac Joint Detail
|
|
Table 195-67
Minimum Pavement Requirements
| ||
|---|---|---|
|
Type
|
Requirement
| |
|
A
|
8 inches portland cement concrete surface pavement
reinforced joint, or equivalent
| |
|
B
|
4 inches bituminous concrete surface course,
Class I, over 6 inches portland cement concrete pavement, or equivalent.
| |
|
C
|
4 inches bituminous plant mix, Class I or B,
over 8 inches aggregate base course; Type B or 6 inches portland cement
concrete pavement or equivalent
| |
|
D
|
2 inches bituminous concrete surface course,
Class I, over 7 inches bituminous stabilized aggregate base or 6 inches
portland cement concrete pavement or equivalent
| |
|
E
|
Bituminous surface treatment, Class A-3, over
8 inches aggregate base course, Type B or equivalent
| |
|
F
|
6 inches aggregate base course, Type B or equivalent.
|
|
Minimum Pavement Requirements by Roadway
Classification[2]
| ||
|---|---|---|
|
Roadway Classification
|
Pavement Type1
| |
|
Major street (highway)
(Note: Urban street: includes functional classification
"minor arterial" up through ”major highway."
Rural highway: includes functional classifications
of "area service highway" and above.)
|
A, B
| |
|
Collector street (highway)
(Note: Urban street: includes functional classification
of "collector.
Rural highway: includes functional classification "major and
minor collectors."
|
A, B, C, D
| |
|
Local street — urban
|
A, B, C, D
| |
|
Local highway — rural
|
A, B, C, D, E
| |
|
Marginal access road
|
A, B, C, D, E
| |
|
Business District
|
A, B
| |
|
Manufacturing District
|
A, B
| |
|
Alley
|
A, B, C, D, E, F
| |
|
Note:
1 Pavement description:
all pavement types regulated by Standard Specification for Road and
Bridge Construction, State of Illinois.
|
A.
Required.
(1)
Sidewalks shall be installed in all subdivisions regardless
of size, unless a waiver is granted from the City Council at the time
of submission of a preliminary plan. Sidewalks and pedestrian ways
and trails shall be designed and constructed in accordance with the
requirements set forth in this section.
(2)
Trails shall be installed in subdivisions in locations
and alignments according to the City's Comprehensive Plan and may
be installed in additional locations which complement the trail system.
B.
Design standards. Subdivisions shall be designed so
that sidewalks or pedestrian ways are provided in such locations and
in such a manner as to do and accomplish the following:
(1)
Sidewalks shall be not less than four feet (1.3 m)
in width; except in the B-2 Highway Business District, where sidewalks
shall not be less than six feet (1.8 m) in width. Where sidewalk exceeds
200 feet in length without interruption of drive, etc., then a minimum
sidewalk width of five feet (1.5 m) is required.[1]
(2)
In all zoning districts, sidewalks shall be located
within dedicated street rights-of-way and shall be roughly parallel
to the street or roadway. Sidewalks shall be located on both sides
of all public streets.
(3)
Where the street design and parallel sidewalk arrangement
do not provide reasonably direct pedestrian access to and from school
sites, park sites, neighborhood commercial centers and other pedestrian
traffic generators, pedestrian ways shall be provided in dedicated
rights-of-way so as to permit reasonably direct pedestrian access
to and from such sites.
(4)
All sidewalks shall conform to all current Americans
With Disabilities Act standards.
(5)
Trails shall be designed in accordance with current
American Association of State Highway and Transportation Officials
(AASHTO) standards. Trail pavement widths shall be 10 to 12 feet (3
m or 3.6 m).
(6)
Transverse slope on sidewalks, pedestrian ways and
trails should not be less than 2% nor greater than 4%.
C.
Right-of-way dedication.
(1)
All sidewalks shall be installed in dedicated public
right-of-way or public easements. Such dedication or easement shall
extend not less than one foot (0.30 m) on each side of the sidewalk
or pedestrian way surface. The back of the sidewalk shall be located
six inches (150 mm) off of the right-of-way line unless otherwise
directed by the City Engineer.
(2)
All trails shall be installed in dedicated public
rights-of-way a minimum of 25 feet (7.5 m) in width.
D.
Schedule of installation. The schedule for installation
of walks shall be set forth at the time of final platting. This schedule
shall be approved by the City Engineer. The schedule shall be such
that sidewalks are installed adjacent to individual lots before occupancy
is granted for the structure on said lot and all sidewalk is installed
within five years of the date of recorded final plat or the time 90%
of the lots in the subdivision have been granted occupancy, whichever
is sooner.
E.
Specifications and special provisions.
(1)
All sidewalks and trails shall use materials and be
installed in a manner meeting or exceeding the requirements, standards
and specifications contained in the most recent edition of the Standard
Specifications for Road and Bridge Construction, Illinois Department
of Transportation, and all special provisions contained herein.
(2)
Special provisions.
(a)
Sidewalk thickness. All sidewalks shall be a
minimum six inches (150 mm) thick in areas zoned commercial, business
or manufacturing, and shall be a minimum four inches (100 mm) thick
in all other areas.
(b)
Transverse expansion joints. Asphaltic transverse
expansion joints, 1/2 inch (13 mm) thick, shall be placed in the sidewalk
at intervals not to exceed 50 feet (15 m). No additional compensation
will be allowed for wire mesh and expansion joints.
(c)
PCC sidewalk special. Where existing ground
surface adjacent to the back of a sidewalk is six inches (0.3 m) or
more above the elevation of the walk, PCC sidewalk special shall be
constructed in accordance with Standard Detail 5.06A.
(d)
Wheelchair ramps. Wheelchair ramps shall be
constructed in accordance with the Standard Specifications for Road
and Bridge Construction.
(e)
Trail pavement thickness. All trail pavement
shall be a minimum two inches (150 mm) of bituminous asphalt surface
course on six inches (150 mm) of aggregate base course. Where appropriate
and approved by the City, a six-inch (150 mm) thick PC concrete pavement
may be installed. When PC concrete pavement is used, all contraction
joints shall be sawed in accordance with detail.
F.
Standard details for the following are included at the end of this chapter:
|
Standard
|
Drawing Title
| |
|---|---|---|
|
A
|
PC Concrete Sidewalk Special
|
A.
Required.
(1)
All subdivisions, regardless of size, within the corporate
limits or under to control of the City, shall include a stormwater
drainage system designed in such a way as to do and accomplish the
requirements of this section of the chapter. The design of all storm
facilities proposed and funded by the City shall also meet the requirements
of this section.
(2)
Developers shall be allowed to tap into any existing
portion of the City's stormwater drainage system if the requirements
of this section have been or will be met and meet the requirements
for tap-on or hookup charges for designated trunk line storm sewers.
B.
Design standards. All subdivisions shall include a
stormwater drainage system designed in such a way to provide that
all lots and outlots in the subdivision will be graded and shaped
so as to drain property within the subdivision and such additional
land as is in the natural drainageway by gravity to catch basins,
inlets, detention/retention facilities and drainageways with adequate
outlet.
(1)
Storm sewers.
(a)
In all new developments except those zoned R-1,
the developer will be required to provide a twelve-inch (300 mm) diameter
storm sewer lateral to a point on each lot; said point to be a point
that will accommodate the natural drainage of the lot served. The
lateral shall be attached to the primary sewer at a drainage structure.
[1]
Design formula. Unless otherwise approved by the City Engineer, formulas to be used in connection with the calculation of run-off reasonably expected from the minimum design storm shall be the Rational Method for total contributing areas of 20 acres (eight hectares) or less and the Soil Conservation Service Method as outlined in Technical Release No. 55 for areas greater than 20 acres (eight hectares). Calculations are to be submitted substantially in the form provided in Exhibit P of the Appendix.[1]
[1]
Editor's Note: Exhibit P is included at the end of this chapter.
[2]
Minimum design storm. The minimum design storm used in calculating run-off in the design formula will be the average rainfall intensity associated with an average recurrence interval of five years for the storm period calculated by the time of concentration as outlined by the latest technical letters of the Illinois State Water Survey for rainfall frequencies. The corresponding charts and tables have been provided in Exhibit P of the Appendix for time of concentration, run-off factors and coefficients and frequency intensities for use in either method for run-off estimation.
[3]
Match 0.90 point of diameter when changing from
one size to another where feasible.
(b)
The stormwater drainage system shall connect
all inlets and catch basins to a storm sewer, pipe or conduit of sufficient
size, grade and capacity to carry the run-off reasonably expected
from the minimum design storm on the area in the natural drainage
area if that area is improved with the type of improvements permitted
and to a maximum density authorized by the then-existing zoning ordinances
of the City for property within the corporate limits and the land
use element of the City's Comprehensive Plan for property outside
the corporate limits; provided, however, no storm sewer shall be less
than 12 inches (300 mm) in diameter.
(c)
The stormwater drainage system shall connect
all storm sewers to other storm sewers or improved drainageways of
sufficient size, grade, and capacity to carry the run-off reasonably
expected from the minimum design storm on the area in the natural
drainage area if that area was improved with the type of improvements
permitted and to the maximum density authorized by the then-existing
zoning ordinances of the City for property within the corporate limits
and the land use element of the City's Comprehensive Plan for property
outside the corporate limits.
(d)
Manholes.
[1]
Public manholes shall be installed at the end
of each storm sewer line, at all changes in grade or alignment, at
all intersections and at distances not greater than 400 feet (120
m) between manholes for sewers of 15 inches (375 mm) or less and 500
feet (150 m) for sewers 18 inches to 30 inches (450 mm to 750 mm).
Greater spacing will be permitted by the City Engineer in larger sewers.
[2]
Public manholes in improved streets or other
hard-surfaced public rights-of-way accessible to vehicular traffic
shall be not more than 800 feet (240 m) apart.
[3]
Minimum drop in a manhole shall be 0.10 foot
(30 mm), and the desired maximum drop in a manhole shall be 24 inches
(600 mm).
(e)
Inlets.
[1]
Inlets for local streets shall be provided for
all low points, and the maximum spacing shall not exceed 400 feet
(120 m); except that the first inlet shall be spaced approximately
400 feet (120 m) from the high point or at no greater distance than
600 feet (180 m) when approved by the City Engineer. Inlet spacing
for all other streets must meet Illinois Department of Transportation
Design and Environment Manual criteria.
(f)
Drainageways. Drainageways shall have a flat
bottom, maximum 3:1 side slopes, the top of the bank shall be constructed
one foot (0.3 m) above computed water surface elevation for the minimum
design storm, and have a ten-foot (three m) maintenance/access lane
on each side of the drainageway.
(2)
Retention and detention facilities.
(a)
No development shall be authorized in the City
unless there is an adequate outlet or the City has approved retention
or detention facilities. The applicant shall show by his detailed
calculations that the outlet is adequate, and the calculations must
be acceptable to the City. In the event the City determines the outlet
is not adequate, the developer shall construct retention or detention
facilities. Such facilities shall be designed based on the design
formula.
[1]
Design formula. Unless otherwise approved by the City Engineer, formulas to be used in connection with the calculation of runoff volumes and allowable release rates reasonably expected from the minimum design storm shall be the Rational Method as outlined on the latest Illinois Department of Transportation Drainage Manual for total contributing areas of 20 acres (eight hectares) or less and the Soil Conservation Hydrograph Method for areas greater than 20 acres (eight hectares). The corresponding instructions, charts, tables and forms have been provided in Exhibit P of the Appendix of this chapter for use in either method of calculation.
[2]
Minimum design storm.
[a]
Storage volume when using the Soil Conservation Hydrograph Method will be determined from inflow hydrographs generated by the design formula using a minimum design storm with a range of rainfall intensities associated with an average recurrence interval of 100 years and an assumed coefficient for the particular post-development zoning district as set forth in Exhibit P of the Appendix of this chapter.
[b]
Storage volume when using the Rational
Method will be the volume generated by the difference between average
runoffs of one-hundred-year rainfall frequency in post-development
condition and three-year rainfall frequency in pre-development condition,
assuming such difference occurs for one hour, the average discharge
being half of the peak discharge calculated by the Rational Method.
[c]
Allowable release rate will be
determined by the design formula using a minimum design storm with
an average rainfall intensity associated with an average recurrence
interval of three years for the storm period calculated by the time
of concentration as outlined by the latest technical letters of the
Illinois State Water Survey for rainfall frequencies. Runoff coefficients
or CN numbers shall reflect pre-development conditions of the watershed.
(b)
Bank stabilization.
[1]
Retention facilities shall be provided with
wave shelves along the entire perimeter in accordance with the standards
in this section.
[2]
Retention/Detention facilities shall have a
maximum 4:1 slope.
[3]
Shoreline surfaces subject to waves shall be
stabilized with structural materials such as rip-rap, cement blocks
or matting, retaining or slope walls, etc.
(c)
Underdrains. Detention facilities to be dedicated
to the public for ownership and maintenance by the City shall include
a system of underdrains to ensure a dry bottom.
[1]
Pipe materials. Underdrains shall be constructed
of rigid perforated PVC pipe, SDR 35 or stronger.
[2]
Fabric envelope. Underdrain pipe shall be encased
in an envelope of fabric weighing not less than 3.5 ounces/square
yard (120 grams/square meter) meeting the requirements for geotechnical
fabric for french drains as specified in the Standard Specifications
for Road and Bridge Construction.
[3]
Pipe size: minimum six inches (150 mm).
[4]
Clean-outs: at ends of runs, junctions, and
a maximum of every 300 feet (90 m) as per standard drawing 6.07K.
[5]
Tracer wire. All underdrains shall be buried
with a tracer wire. Tracer wire shall be #12 THWN single-conductor
solid copper cable. Tracer wires shall be terminated at clean-outs
as shown in Standard Drawing 6.07K.
(d)
Earthen dams. When dedicated to the public for
ownership and maintenance by the City, earthen dams shall meet the
following criteria:
[1]
Side slope: 4:1 or flatter.
[2]
Minimum ten-foot (three m) wide flat crest for
access by maintenance equipment.
[3]
Freeboard. All earthen dams shall be constructed
with a minimum of one foot (300 mm) of freeboard over the maximum
anticipated water level in the emergency spillway.
[4]
All earthen dams shall include an impervious
compacted clay core. The core shall be of sufficient width to allow
for mechanical compaction and of sufficient depth to penetrate the
overburden of topsoil, keying into the underlying strata of virgin
clay.
[5]
The developer shall be responsible for obtaining
all construction permits required by governmental agencies.
(e)
Emergency spillway. All detention and retention
facilities, whether publicly or privately owned and maintained, shall
include an emergency spillway.
[1]
Emergency spillways shall, wherever feasible,
be constructed in virgin ground.
[2]
Erosion protection. Emergency spillways shall
be protected from erosion with approved surface paving or vertical
cutoff walls appropriate for the impoundment and the height of the
spillway crest.
[3]
Capacity. Emergency spillways shall be sized
for no less than 75% of the maximum peak inflow into the basin.
(3)
Adequate outfall shall be provided. If the outlet
is not adequate, then retention or detention shall be provided. The
applicant should show by his detailed calculations that the outlet
is adequate based on the design formula, with calculations acceptable
by the City.
(a)
Design formula. Unless otherwise approved by
the City Engineer, formulas to be used in connection with the calculation
of runoff reasonably expected from the minimum design storm shall
be the Rational Method for total contributing areas of 20 acres (eight
hectares) or less and the Soil Conservation Service Method as outlined
in Technical Release No. 55 for areas greater than 20 acres (eight
hectares).
(b)
Minimum design storm: used in calculating runoff
in the design formula; will be the average rainfall intensity associated
with an average recurrence interval of 25 years for waterways and
five years for storm sewers for the storm period calculated by the
time of concentration as outlined by the latest Technical Letters
of the Illinois State Water Survey for rainfall frequencies.
(4)
Sump pump discharge.
(a)
In all new developments zoned R-1, the developer
will be required to provide a minimum two-inch (50 mm) diameter sump
pump discharge lateral to a point on each lot; said point to be a
point that will accommodate the subsurface discharge from around the
foundation of the building served. The lateral shall be attached to
the primary sump pump discharge conduit by the installation of a tee
or wye connection.
(b)
The primary sump pump discharge system shall
connect all laterals to a storm sewer, pipe or conduit of sufficient
size, grade and capacity to carry the discharge reasonably expected
from the area improved with the maximum density authorized by the
then-existing zoning ordinances of the City.[2] No primary sump pump discharge conduit shall be less than
six inches (150 mm) in diameter or greater than 10 inches (250 mm)
in diameter; the design method of storm sewers shall govern.
(c)
The primary sump pump discharge system shall
connect all conduit to other storm sewers, inlets or catch basins,
manholes or improved drainageways of sufficient size, grade and capacity
to carry the discharge reasonably expected in addition to the surface
runoff expected from the minimum design storm of the design of storm
sewers and drainageways as described in this section.
(d)
Cleanouts.
[1]
Cleanouts shall be installed at the end of each
primary sump pump discharge line, at all changes in grade or alignment,
and at distances not greater than 200 feet (60 m) between cleanouts
or between cleanouts and manholes or inlets. Inlets or manholes my
be substituted for cleanouts located within the public right-of-way.
(e)
No sump pump discharge lateral or primary conduit
shall be installed beneath a public street pavement. The Village will
not accept for maintenance any primary sump pump discharge line located
along rear or side lot lines.
(f)
All sump pump discharge conduits not constructed
of metallic material shall be installed with tracer location wire.
Tracer wire shall be #12 THWN single-conductor solid copper cable.
Tracer wire shall be terminated at cleanouts as shown in Standard
Drawing 6.07K.
C.
Design calculation requirements. Calculations required to demonstrate compliance with the design standards enumerated in the previous subsections of this section shall be submitted substantially in the form and content as shown and provided in Exhibit P of the Appendix. Calculations submitted with preliminary plans are not required to be in as great detail as the calculations required to be submitted with public improvement engineering plans and specifications.
D.
Right-of-way and easement dedications.
(1)
Drainageways shall be located in dedicated public
rights-of-way. Rights-of-way for drainageways shall be a minimum of
100 feet (30 m) wide. This minimum width shall be increased if the
City Engineer shall determine that the drainage way's hydraulic capacity
is inadequate to properly serve its drainage function.
(2)
Storm sewers shall be located in public easements
of dedicated public rights-of-way. Such easements and rights-of-way
shall be of sufficient width and the storm sewer shall be installed
at such locations therein as to permit open cut installation, maintenance
and repair within the confines of the easement or right-of-way without
relocation or other unreasonable interference with other public utilities
located therein and so as to meet the following minimum standards:
(a)
Fifteen feet (4.5 m) in width plus five feet
(1.5 m) for each additional utility for storm sewers 24 inches (600
mm) in diameter and 10 feet (three m) for water main or other sewers.
(b)
Two additional feet (600 mm) in width for each
12 inches (300 mm), or portion thereof, of additional storm sewer
diameter provided in excess of 24 inches (600 mm).
(c)
Additional width may be required if storm sewers
exceed 15 feet (4.5 m) in depth.
(3)
Sump pump discharge line shall be located in public
easements or dedicated public rights-of-way. Such easements and rights-of-way
shall be of sufficient width and the conduit shall be installed at
such locations therein as to permit open cut installation, maintenance
and repair within the confines of the easement or right-of-way without
relocation or other unreasonable interference with other public utilities
located therein and so as to meet the following minimum standards:
(a)
Ten feet (three m) in width plus five feet (1.5
m) for each additional utility for sump pump discharge line.
E.
City's participation in cost.
(1)
Storm sewers and drainageways. Where it is necessary
to construct storm sewers and drainageways through land not being
developed, the City may pay a percentage of the cost of the storm
sewer or drainageway, provided funds are available, based on the percentage
of the drainage area contributing to the storm sewer or drainageway
downstream from the development. The developer's cost shall be based
on the drainage area coming through and including his development.
The developer is required to pay tap-on fees for particular trunk
line storm sewers if available.
(2)
Detention/Retention facilities.
(a)
In all developments not already served by an
adequate existing or proposed stormwater detention/retention facility,
the developer shall provide a stormwater detention/retention facility
complying with this section.
(b)
Facilities shall be designed so that local storm
sewer systems and drainageways will discharge directly to proposed
or existing detention/retention facilities, or to an adequate trunk
line storm sewer and flood route, or drainageway feeding same, which
discharges into a proposed or existing stormwater detention/retention
facility. Where adequate storm sewer or drainageway capacity is not
available to convey design runoff to an existing downstream detention/retention
facility, an on-site detention/retention facility shall be required.
Calculations demonstrating adequacy must be provided to the City.
(3)
Engineering costs. The developer will be responsible
for all engineering costs for design of storm sewers, drainageways
and detention/retention facilities within his/her development.
F.
Specifications and special provisions.
(1)
Storm sewers shall use materials and be installed
in the manner meeting or exceeding the requirements, standards, and
specifications contained in the Illinois Standard Specifications for
Road and Bridge Construction in Illinois, the current edition as then
modified, supplemented and amended by this chapter or the City Engineer.
These modifications, amendments and amplifications have been provided
in this section.
(2)
Drainageways and retention or detention facilities
shall be constructed in the manner meeting or exceeding the requirements,
standards and specifications contained in the applicable sections
of the Standard Specifications for Road and Bridge Construction for
the Illinois Department of Transportation, the current edition as
then modified, supplemented and amended by this chapter or the City
Engineer. These modifications, amendments and amplifications have
been provided in this section.
(3)
Sump pump discharge lines shall be constructed in
the manner meeting or exceeding the requirements, standards and specifications
contained in the applicable sections of the Standard Specifications
for Road and Bridge Construction in Illinois, the current edition
as then modified, supplemented and amended by this chapter or the
City Engineer. These modifications have been provided in this section.
(4)
Materials.
(a)
Storm sewers. Materials shall be in accordance
with Section 550 of the Standard Specifications for Road and Bridge
Construction and shall conform to one of the following:
[1]
Reinforced concrete arch culvert, storm drain
and sewer pipe.
[2]
Reinforced concrete culvert, storm drain and
sewer pipe.
[3]
Reinforced concrete elliptical culvert, storm
drain and sewer pipe.
[4]
Ductile iron pipe Class 150 conforming to ANSI/AWWA
C-151/A21.51, with single gasket joints meeting ANSI/AWWA C-104/A21.4
and with bituminous coating as per Section 51-8.1 of ANSI/AWWA C-151/A21.51.
(b)
Sump pump discharge lines not under pavements
shall be constructed of rigid PVC, SDR 35 or stronger, conforming
to Section 1040.10 of the Standard Specifications for Road and Bridge
Construction. Sump pump discharge lines under pavements shall be constructed
of the same materials as storm sewers.
(5)
Special provisions.
(a)
Storm sewer special provisions.
[1]
Adjustment of frame and grate.
[a]
Final grade for all manhole castings
will be determined after the curb and gutter have been poured and
the subgrade and/or base has been constructed. Final adjustment of
the frame and grate shall be made in the following manner: After the
curb and gutter have been poured and the base constructed, the final
elevation will be determined by the City Engineer.
[b]
The frame and grate will be adjusted
to this elevation in accordance with the Standard Specifications.
Any material disturbed while adjusting the frame and grate will be
disposed of and all fill made with lean concrete. A maximum of eight
inches (200 mm) of adjusting rings shall be allowed.
[2]
Jetting of trenches. All sewer trenches under
streets, driveways or sidewalks shall be compacted by jetting or as
directed by the City Engineer.
[3]
Granular cradle. A granular cradle will be required
for all sewers as shown in the Standard Details. Material for the
granular cradle shall comply with either Type A or C gradations in
accordance with Section 550 of the Standard Specifications.
[4]
Trench backfill.
[a]
Material for trench backfill shall
comply with Section 1003.04 of the Standard Specifications for Road
and Bridge Construction. All trenches under another sewer or water
main, or under existing streets, sidewalks, driveways and curb and
gutter, shall be backfilled with trench backfill material in accordance
with Section 550.07 of the Standard Specifications.
[b]
Material for trench backfill shall
comply with Article 1003.04 of the Standard Specifications, except
that the maximum size shall be three inches.
[5]
Inlet Type A with Type 3 frame and grate. Section
612 of the Standard Specifications shall govern the construction of
inlets Type A. They shall be built in accordance with the Standard
Details for Inlets Type A. Section 614 of the Standard Specifications
shall govern the construction of frame and grate Type 3. Frame and
grate Type 3 shall be equal to Neenah No. R-3010. The curb box shall
be of the open type, and the grate shall be Type A. Only cast-iron
grates shall be used.
[6]
Inlet Type H with Type 50 frame and grate. Section
612 shall govern the construction of inlets Type H. They shall be
built in accordance with the Standard Details for Inlets Type H. Section
614 shall govern the construction of frame and grate Type 50. Frame
and grate Type 50 shall be equal to Neenah No. R-3067, and the grate
shall be Type A. Only cast-iron grates shall be used.
(b)
Sump pump discharge special provisions.
[1]
Sump pump discharge pipes. Material for sump
pump discharge conduit shall be polyvinyl chloride (PVC) sewer pipe
conforming to ASTM D3034, Type PSM, for sizes four inches to 10 inches
(100 mm to 250 mm). The minimum standard dimension ratio (SDR) acceptable
shall be 35. Material for conduit exceeding a diameter size of 10
inches (250 mm) shall be the same as determined in this section for
storm sewers. Sump pump discharge cleanouts shall be constructed in
accordance with Standard Detail 607-J.
G.
Standard details for the following are included at the end of this chapter:
|
Standard
|
Drawing Title
| |
|---|---|---|
|
A
|
Standard Manhole Details
| |
|
B
|
Manhole Details Sewers 48" dia. and Larger
| |
|
C
|
Inlet Type A Details
| |
|
D
|
Inlet Types G and H Details
| |
|
E
|
Standard Concrete Collar and Pipe Bedding and
Excavation Details
| |
|
F
|
Water and Sewer Separation Requirements (Vertical)
| |
|
G
|
Water and Sewer Separation Requirements (Vertical)
| |
|
H
|
Water and Sewer Separation Requirements (Horizontal)
| |
|
I
|
Slope Wall Detail
| |
|
J
|
Sump Pump Discharge Cleanout Detail
| |
|
K
|
Detention Underdrain Cleanout and Junction
|
[Amended 8-31-2009 by Ord. No. 2009-6]
A.
All subdivisions and developments, regardless of size,
within the corporate limits or under the control of City, shall include
provisions for the construction of sanitary sewage facilities designed
and constructed in accordance with this section. The failure to coordinate
the planning, design, construction, inspection and approval of public
improvements with the City of Lexington and its engineer may lead
to delays in approval and acceptance, and higher fees.
B.
General requirements.
(1)
All
subdivisions shall be designed so the proposed sanitary sewer system
does and accomplishes the following:
(a)
Conforms to the City of Lexington Comprehensive
Plan.
(b)
Extends interceptor sanitary sewers through
the proposed subdivision to serve upstream properties in the natural
drainage area.
(c)
Provides sanitary sewer services with separate
service connections terminating not less than two feet inside the
property or easement line of each proposed lot of record.
(d)
Has adequate capacity to drain the portions
of the subdivision proposed to be served by the sewer and any property
upstream thereof which drains into or may drain into that sewer, based
on the effluent discharge reasonably expected from development of
the type and to the maximum density permitted by the then-existing
zoning ordinances of the City for property within the corporate limits
and the land use element of the City's Comprehensive Plan for property
outside the corporate limits.
(e)
Maintains separation from the public water supply
system.
(f)
Discourages the use of sewage pumping facilities.
(g)
Permits the use of private sewage disposal systems
only in the following situations:
[1]
Where public sanitary sewers are not within
200 feet of an area included in the subdivision's preliminary plan;
and
[2]
Where the subdivision contains no lots less
than 20,000 square feet in area, not more than two lots of more than
20,000 square feet but less than 30,000 square feet and not more than
five lots with more than 30,000 square feet but less than one acre;
and
[4]
A fifteen-foot permanent easement is dedicated
for the purpose of a future sanitary sewer.
[5]
Private sewage disposal systems, including but not limited to septic
tanks, holding tanks, distribution boxes, subsurface seepage systems,
sand filters, and waste stabilization ponds, which are no longer active
shall be emptied and abandoned in accordance with all state, county,
and City regulations. The owner of the property shall provide documentation
to the City that the private disposal system has been properly abandoned.
(h)
Designed to prevent installation of sanitary
sewers in rear yard easements and permit installation in side yard
easements only when necessary.
(i)
Meet requirements for pump stations if required.
(2)
The
City will only accept public improvements after full compliance with
the standards, as set forth by this chapter, has been verified by
the City Engineer. The developer, or other party tendering a public
improvement for acceptance, must affirmatively state that he/she is
unaware of any material defects in the public improvement which could
lead to its early deterioration, maintenance or repairs prior to the
standard expected maintenance or repairs on similar public improvements,
and that developer is also unaware of damage to drainage tiles, other
utilities, or septic fields/systems during the construction of the
public improvement.
C.
Design standards.
(1)
Design formula.
(a)
Sanitary sewers shall be designed to provide
adequate capacity without surcharge, using Manning's Formula.
|
Metric
|
English
| ||
|
1
V = nR2/3 S1/2
|
1.49
V = nR2/3 S1/2
| ||
|
Where:
| |||
|
V = Velocity of flow in meters per second
|
V = Velocity of flow in feet per second
| ||
|
n = Roughness factor
|
n = Roughness factor
| ||
|
R = Hydraulic Radius (meters)
|
R = Hydraulic radius (feet)
| ||
|
S = Slope of energy grade line for conduit running
full (meters per meter)
|
S = Slope of energy grade line for conduit running
full (feet per foot)
| ||
[1]
For new smooth-walled sewer pipe n = 0.013.
[2]
Sanitary sewers shall flow with a desired minimum
velocity of 0.8 meter per second (2.5 feet per second) with an absolute
minimum velocity of 0.6 meter per second (two feet per second). Proposed
sanitary sewage flow shall be based on the population after full development
of the area. For undeveloped areas where the details of future development
are not known, design population will be estimated based on the zoning
classification and expected use conforming to the City of Lexington
Comprehensive Plan.
(b)
Flow criteria. Sanitary sewers shall be sized
to accept the following peak design flows:
[1]
Domestic: 400 gallons (1,500 liters) per day
per capita for lateral sewers; average flow of 375 liters (100 gallons)
per capita peaked by a factor per Exhibit Q in the Appendix plus 110
liters/mm dia/hectare (300 gal/inch/dia/acre) for infiltration.[1]
[1]
Editor's Note: See the details included at the end of this chapter.
[2]
Commercial: 95,000 liters/hectare (10,000 gallons/acre)
per day for lateral and industrial sewers; 66,000 liters/hectare (7,000
gallons/acre) per day for trunk sewers.
(2)
Elevation of building sewer. No basement, half-basement
or any other portion of a building having a floor elevation beneath
the ground surface over the City sewer at the point of the connection
may be connected to the City sewer by gravity. In areas where the
ground line over the City sewer is to be altered, the proposed final
ground elevation shall be used. The maximum depth to the top of the
building service sewer shall be three feet below finished grade at
the point where it enters such building. In all buildings in which
the building drain is too low to provide gravity flow to the City
sewer, all sewage carried by such drain shall be lifted by approved
mechanical means and discharged into the building sewer. No water-operated
sewage ejector shall be used. Any property owner or other interested
person may appeal in writing to the City for a variance and exception
to the restriction imposed hereby, and the City Council may grant
a variance or exception upon a satisfactory showing by the applicant
that, due to circumstance unique to the affected property, the use
of a gravity flow connection to service a below-grade sanitary facility
will not be likely to result in sewer backups as a result thereof.
Appeals filed hereunder shall be made in writing to the City Council
and forwarded by it to the appropriate committee, or any other committee
hereafter designated for such purpose, for recommendation.
(3)
Materials. All sanitary sewer pipe shall be polyvinyl
chloride (PVC) ASTM D3034, SDR 26; bell and spigot for elastomeric
gasket joints, minimum cell class 12454B for sizes up to fifteen-inch
diameter (380 mm); joints per ASTM D3212 and gaskets per ASTM F477.
Pipe may also be ductile iron AWWA C-150, AWWA C-151 with mechanical
or push-on joints per AWWA C-111; polyethylene film encasement per
AWWA C-105 and fittings per AWWA C-110 or C-153. Pipe may also be
vitrified clay pipe, ASTM Designation C-700 (extra-strength), with
pipe joints conforming to ASTM C-425. Use of other materials for sanitary
sewers must be approved in writing by the City prior to their installation.
(4)
Minimum size. All public sanitary sewers shall be
a minimum of eight inches (200 mm) in diameter. All service sewer
lines shall be a minimum of six inches (150 mm) in diameter.
(5)
Alignment. All sewers shall be laid straight in both
horizontal and vertical planes between manholes unless otherwise approved
by the City Engineer.
(6)
Sewer size changes. When sanitary sewers of different
diameters join in a manhole, the invert elevations shall be adjusted
to maintain a uniform energy gradient. Alignment of the 0.9 depth
points of the sewers shall be implemented to meet this requirement.
(7)
High-velocity protection. Where velocities greater
than 10 feet per second (three mps) will occur in a sanitary sewer
when flowing full, special provisions shall be taken to prevent scouring
or displacement of the pipe.
(8)
Manholes.
(a)
Provide public manholes at the end of each line,
at all changes in grade, size or alignment, in improved streets or
other public rights-of-way accessible to vehicular access and sewer
maintenance equipment, at all intersections and at distances not greater
than 400 feet (120 m). Greater spacing may be permitted by the City
Engineer in large sewers and in those carrying a settled effluent.
(b)
Provide an outside drop pipe for sewers entering
a manhole at an elevation of 24 inches (600 mm) or more above the
manhole invert. Where the difference in elevation between the incoming
sewer and the manhole invert is less than 24 inches (600 mm), the
invert should be filleted to prevent the depositing of solids. Drop
manholes shall be constructed in accordance with Standard Detail 7.07B-1.
(9)
Service drops in manholes:
(a)
New construction. Outside service drops shall
be provided as per Standard Detail 7.07 B-1 in new construction when
a proposed sanitary service enters a proposed manhole more than 600
mm (two feet) above the invert of the manhole. With the permission
of the City Engineer, for existing manholes an inside drop connection
as per Standard Detail 7.07 B-2 may be used.
D.
Right-of-way dedication. Generally, all sewers shall
be installed in public easements or dedicated public rights-of-way.
Such easements and rights-of-way are to be of sufficient width and
the sewers are to be installed at such locations so as to permit open
cut installation, maintenance and repair within the confines of the
easement or right-of-way without relocation or other unreasonable
interference with other public utilities located therein and so as
to meet the following minimum standards:
E.
Developer's cost.
(1)
The developer shall pay all costs to oversize sanitary
sewer lines to serve upstream properties with sizes to be approved
by the City Engineer. The developer may attempt to negotiate with
upstream property owners for cost participation.
(2)
Engineering costs. The developer will be responsible
for all engineering costs for design of sanitary sewer facilities
including pump stations within his/her development.
(3)
Inspection
costs. The developer will be responsible for all inspection costs
associated with the installation of sanitary sewer facilities, including
pump stations, within his/her development.
F.
Specifications and special provisions. All sanitary
sewers shall be installed in accordance with all applicable sections
of the Standard Specifications for Water and Sewer Main Construction
in Illinois, the current edition as then modified, supplemented and
amended by this chapter or the City Engineer. These modifications,
amendments and amplifications have been provided in this section.
(1)
Special provisions for sanitary sewers.
(a)
Granular cradle. A granular cradle (bedding
and haunching) will be required for all sanitary sewers as shown in
the Standard Details and in accordance with Section 20-2.20B of the
Standard Specifications for Water and Sewer Main Construction.
(b)
Trench backfill. All trenches under another
sewer or water main, or under or within 0.6 meter (two feet) of existing
or proposed streets, existing sidewalks and driveways, shall be backfilled
with select granular material in accordance with Section 308 of the
Standard Specifications for Road and Bridge Construction. Material
for trench backfill shall comply with Section 1003.04 of the Standard
Specifications for Road and Bridge Construction, except that the following
graduations may be used in addition to FA6: CA6 and CA 10; and except
that the maximum size shall be 75 mm (three inches) and that no material
over 13 mm (1/2 inch) and shall be used below 300 mm (one foot) over
the top of the sewer.
(c)
Compaction of trench backfill. All sewer trenches
under streets, driveways or sidewalks shall be compacted by jetting,
mechanical compaction, or as directed by the City Engineer.
(d)
Testing. The leakage test will be by the low-pressure
air method and conducted by the developer. Level ground and provide
48 hours' notice. All sanitary sewers shall be cleaned and televised
by an approved televising company, with a CD/DVD recording provided
to the City. The CD/DVD recording shall record a clear picture of
the entire periphery of the pipe and shall include recorded locations
of all data and features seen on the videotape. Televising shall occur
just prior to final acceptance and/or placement into service by the
City.
(e)
Sewer service markings. The contractor shall
place two-foot by four-foot markers (50 mm by 100 mm) extending from
the bottom of the sewer service to two feet (0.6 m) above the ground
at the location where each sewer service terminates. These markers
shall be painted green and installed at the time the services are
constructed.
(f)
Curb marking of sewer services. At the time
the curb and gutter are poured, the contractor shall mark the top
of the curb with an "S" to mark location of said sewer service.
(g)
Sewer service laterals.
[1]
Location.
[a]
All services shall terminate at a point at least two feet (0.6
m) inside the property line or a minimum of two feet (0.6 m) beyond
any front yard easement containing a City- or county-/township-owned
utility. For properties presently occupied/developed, services may
terminate at or near property lines at the City’s option.
[b]
Sewer services to individual lots, which are to be privately
maintained, shall not be located in easements across other lots, except
for short distances to reach the public sewer main located in an easement
immediately adjacent to the lot being served, or to reach the public
sewer main located in a front yard easement on the opposite side of,
and adjacent to, the street right-of-way from the lot being served.
[2]
Depth. All services shall terminate at a depth of no less than four
feet nor more than six feet below the adjacent top of curb unless
otherwise approved by the City.
[3]
Slope. All services shall be laid at a slope of 1.0% or greater.
Changes in slope on services may be made by "breaking joints." provided
the joint seal is airtight and the recommendations of the manufacturer
are not exceeded. Fittings not greater than a forty-five-degree bend
may be used where changes in grade dictate.
[4]
Service tees or wyes over 12 feet (3.6 m) deep shall be encased in
concrete as per Standard Detail D.[2]
[2]
Editor's Note: Standard Detail D is included at the end of this chapter.
[5]
All sewer service laterals shall be a minimum of six inches (150
mm) in diameter.
[6]
The waste piping from a point five feet outside the building to the
City sanitary sewer shall be considered the house sewer (or sewer
service lateral) and shall be constructed of the following materials
with a minimum diameter of six inches: ductile iron, PVC Schedule
80 with cement joints, PVC Schedule 21 Type PSM-SDR slip joint, PVC
Schedule 40, vitrified clay pipe, ASTM Designation C-700 (extra-strength)
with pipe joints conforming to ASTM C-425. Cellular-core PVC is prohibited.
All material shall be embedded in three-fourths-inch crushed stone
with a minimum of four inches below the sewer pipe and six inches
above the top of the sewer pipe. Cleanouts are required in accordance
with the Illinois Plumbing Code.
(h)
Adjustment of manhole casting. Final grade for
all manhole castings will be determined after the curb and gutter
have been poured and the subgrade and/or base has been constructed.
Final adjustment of the frame and grate shall be made in the following
manner: After the curb and gutter have been poured and the base constructed,
the final elevation will be determined by the City Engineer. The frame
and grate will be adjusted to this elevation in accordance with the
Standard Specifications. Any material disturbed while adjusting the
frame and grate will be disposed of and all fill made with lean concrete.
A maximum of 12 inches (300 mm) of adjusting rings shall be allowed.
For manholes located in easements outside public rights-of-way, the
frame and grate shall be adjusted two inches (51 mm) above the final
elevation as determined on the approved lot grading plan.
(i)
Utilities. The owner or his designee shall notify the utility companies
of the impending project, and the plans shall indicate the general
location of the utility main lines. The contractor shall have the
responsibility, before any construction work has begun, of obtaining
from all utilities the exact location of any underground facilities
in the area of construction, whether indicated on the plans or not.
Any facilities disturbed by the contractor shall be restored by him
at his own expense. The contractor shall coordinate with the proper
utility the relocation of any facility designated on the plans or
deemed necessary to be relocated by the City in order to complete
construction of the project. Residents shall be notified a minimum
of 48 hours in advance of impending service outages, and no residence
shall be without service overnight.
(2)
Special provisions modifying Standard Specifications
for Water and Sewer Main Construction in Illinois.
|
Section
|
Title
|
Change
| |
|---|---|---|---|
|
30-3.01E and F
|
Ductile iron pipe
|
Add: "Inside of all pipes shall have standard
cement mortar lining, and the inside and outside shall be tar (seal)
coated."
| |
|
31-1.11A(1)
|
Selection of test sections
|
Delete Paragraphs two, three and four and substitute
the following: "All sections of the sewer shall be tested, except
for those designated portions of the sewer that are placed into service
during the construction process."
| |
|
32-2.07
|
Cast iron frames, cover and steps
|
Add the following:
(1) Covers shall be Neenah, East Jordan or equal.
Neenah numbers are given as examples.
(2) For sanitary manholes: Standard Type 1 frame
and lid, Neenah R-1772B, with Type B lid and NF-9204 pick hole. All
lids for sanitary manholes shall be self-sealing.
(3) Steps shall be M.A. Industries PSI-PF manhole
step or equal conforming to ASTM C-478
| |
|
32-3.05
|
Precast manholes
|
Add the following to Paragraph 3: "No bitumastic
material shall be used on the inside of manholes. Inside of all joints
shall be finished with non-shrink-type grout and rubber gaskets."
| |
|
32-3.09
|
Placing castings
|
Change to read: "Castings placed on concrete
or masonry surfaces shall be set in full mortar bed or on approved
solid bituminous gaskets."
| |
|
32-3.09A
|
Streets at grade
|
Change "12 inches (300 mm)" to "8 inches (200
mm)."
| |
|
32-3.09B
|
Streets or alleys with no established grade
|
Change "12 inches (300 mm)" to "8 inches (200
mm)."
| |
|
32-3.09C
|
Manholes not within street or alley areas
|
(1) Change "18 inches (450 mm)" to "24 inches
(600 mm)."
(2) Change second paragraph to read: "Unless
otherwise directed, the top of manhole castings shall be at grade
of existing surface."
| |
|
32-3.11
|
Pipe connections
|
Add the following sentence: "Bituminous material
shall be used on the outside of the manhole only."
|
G.
Standard details for the following are included at the end of this chapter:
|
Standard
|
Drawing Title
| |
|---|---|---|
|
A
|
Standard Manhole Details
| |
|
B-1
|
Standard Drop Manhole Details
| |
|
B-2
|
Inside Drop Service Connection
| |
|
C
|
Typical House Connections
| |
|
D
|
Standard Concrete Collar and Pipe Bedding and
Excavation Details
| |
|
E
|
Water and Sewer Separation Requirements (Vertical)
| |
|
F
|
Water and Sewer Separation Requirements (Vertical)
| |
|
G
|
Water and Sewer Separation Requirements (Horizontal)
|
A.
General requirements. All developments shall be designed
so that proposed water distribution and supply system does and accomplishes
the following:
(1)
Conforms with the City of Lexington Comprehensive
Plan.
(2)
Extends water mains through the proposed development
to serve otherwise unserved abutting properties.
(3)
Provides adequate capacity as determined by the City
and City Engineer to serve all the lots proposed to be served by the
main, plus any additional extensions to the main which might be made
to develop property in the same pressure zone with the type of uses
and to the maximum density permitted by the then-existing zoning ordinances
of the City with respect to the property within the corporate limits
and the land use element of the City's Comprehensive Plan for proposals
outside the corporate limits.
(4)
Permits private well only in the following instances:
(a)
Outside the corporate limits; or
(b)
Where there are more than 20,000 square feet
(1,850 square meters) in the lot served; and
(c)
In complete conformance with Illinois Environmental
Protection Agency and McLean County Health Department standards; and
(d)
If a public water supply is not reasonably available.
(5)
Maintains separation from public or private sewer
or septic systems.
(6)
Loops water mains so as to avoid dead-ends.
B.
Design standards.
(1)
Provide water service and an individual shutoff valve
and box located in the public right-of-way with a service line stub
extended to a point ± two feet from the property line or easement
line which, upon recording of the final plat, will become a lot of
record. A water service connection of Type K copper must be provided
for and centered on each lot of record in residential subdivisions.
Water service is to be determined and installed only if a specific
use is known beforehand and in accordance with Illinois State Plumbing
Code.[1]
(2)
Water mains shall be so designed so that looped water
mains do not reconnect to the same source main unless there is no
alternative, whereupon the connections must be a minimum of 500 feet
(150 m) apart or have a valve located between the two connections.
(3)
Provide steamer-type hydrants at each intersection
of two or more streets or roadways, and provide additional hydrants
so that hydrants are spaced at intervals not exceeding 400 feet (120
m) in areas zoned single-family and two-family residential, and not
exceeding 250 feet (75 m) in areas otherwise zoned. For all zoning
districts other than R-1, all hydrants shall be steamer-type. Where
steamer hydrants are not practical or hydrant spacing is excessive,
the City Engineer may recommend a variance to the City Council.
(4)
Hydrants located at other than street intersections
are to be positioned adjacent to the side-yard lot line of two adjoining
properties so as to achieve the nearest approximation of hydrant spacing
interval required for a specific zoning designation. If pipe joints
or other utility conflicts prevent locating at the nearest side-yard
lot line, proceed to the next nearest lot line.
(5)
Hydrants are not to be located closer than 10 feet
(three m) to any light standard, tree, signpost or other permanent
structure that would impede access to the hydrant or reduce its visibility.
(6)
All in-line valves shall be installed at intervals
not to exceed 600 feet (180 m).
(7)
Valves shall be placed at each branch connection,
and an in-line valve shall be located near the branch upstream or
downstream from each branch.
(8)
Provide water mains having an inside diameter with
a minimum of six inches' nominal pipe size. All pipe shall be ductile
iron Class 52 with polyethylene encasement or PVC SDR-21 (ASTM D2241).
(9)
Water mains shall not be located closer than 10 feet
(three m) horizontally or 18 inches (450 mm) vertically when crossing
any public or private sanitary sewer, storm sewer, drain or manhole.
(10)
If a subdivision is constructed in phases, creating
a temporary dead-end water main, a valve and hydrant must be installed
at each temporary terminus.
(11)
Whenever water mains must cross watercourses,
railroads or interstate highways, a valve shall be provided at both
ends of the crossing so that the sections can be isolated for testing
or repair.
(12)
There shall be no connection or potentially
possible connection between the public water supply system and any
pipes, pumps, hydrants or tanks from another system whereby unsafe
water or other contaminating materials may be discharged or drawn
into the public water supply.
(13)
No water main shall be installed in rear yard
easements.
C.
Right-of-way and easement dedications. All water mains
shall be installed in public easements or dedicated public rights-of-way.
Such easements and rights-of-way shall be of sufficient width and
the water mains shall be installed at such locations as to permit
open cut installation, maintenance and repair within the confines
of the easement or right-of-way without relocation or unreasonable
interference with other public utilities located therein and so as
to meet the following minimum standards:
(1)
Have a minimum width of 15 feet (five m), plus five
feet (1.5 m) for each additional utility, plus 10 feet (three m) if
width abuts private property on two or more sides.
(2)
An additional 10 feet (three m) of width if a water
main is to be installed parallel to a sanitary sewer, so that the
two utilities will be at least 10 feet (three m) apart.
D.
City's participation in cost.
(1)
Water mains. Where installation of water mains of
larger capacity than required to serve land owned by the developer
is required by the City Council to serve future growth in the vicinity
of the development, the developer shall pay for only his/her portion,
based on the code requirements for his/her development, of the total
cost of the installation; the balance shall be borne by the City.
Provided funds are available, the City will pay the difference in
the cost between the size required for the developer's land (minimum
six inches) and the larger size required. If there is an existing
tap-on charge, then the developer shall abide by same.
(2)
Engineering costs. The developer will be responsible
for all engineering costs for design of water main facilities within
his/her development.
E.
Service connection fee schedule. Reference Chapter 63, Fees, of the Code of the City of Lexington.
F.
Specification and special provisions. All water mains
shall use materials and be installed in such manner meeting or exceeding
the required standards and specifications contained in the Standard
Specifications for Water and Sewer Main Construction in Illinois,
the then-current edition as then modified, supplemented and amended
by this chapter or the City Engineer. These modifications, amendments
and amplifications have been provided in this section.
(1)
Special provisions modifying Standard Specifications
for Water and Sewer Main Construction in Illinois.
|
Section
|
Title
|
Change
| |
|---|---|---|---|
|
Division IV, Water Distribution. Applicable
sections of this division also apply to force main construction.
| |||
|
40-2
|
Pipe Materials
|
Water mains shall be ductile iron pipe Class
52 or PVC SDR-21 with single-gasket joints.
| |
|
40-2.04
|
Ductile Iron Pipe
|
Add the following: "Cement lining, exterior
tar (seal) coating and polyethylene encasement shall be provided for
all ductile iron pipe. All pipe shall have push-on-type joints unless
otherwise called for."
| |
|
40-2.06A
|
Cast Iron or Ductile Iron Pipe Fitting
|
Add the following:
(1) Cast iron or ductile iron fittings may be
used.
(2) Cement lining is required for fittings.
| |
|
40-2.07C
|
Stops and Fittings
|
Corporation and curb stops shall be A.Y. McDonald
MAC-PAC compression or approved equal. Curb boxes shall be A.Y. McDonald
or equal, four-foot to five-foot (1.2 m to 1.5 m) adjustment with
stationary operating rod.
| |
|
40-2.08
|
Specialty Valves
|
Tapping machine sleeves shall be Cascade/CS22,
CS12 with Waterous Series 500 valves.
| |
|
41-2.02A
|
Depth of Pipe Cover
|
Minimum depth shall be four feet (1.2 m).
| |
|
41-2.02B
|
Pipe Foundations and Unsuitable Trench Conditions
|
Change first sentence to read: "For pipe beddings,
see Sections 20-2.20A(1)b."
| |
|
41-2.12A
|
Pipe Conditions
|
Test pressure shall be not less than 100 psi.
| |
|
41-2.12C
|
Leakage Test
|
Change test pressure requirement to 100 psi.
| |
|
41-3
|
Measurement
|
Cast-iron fittings: If proposal does not contain
an item for fittings, the cost of furnishing and installing fittings
shall be included in the unit price bid for the various mains.
| |
|
45-2.02
|
Hydrant Details
|
(1) In second paragraph, bury depth shall be
five feet (1.5 m).
(2) In fourth paragraph, Hydrants with six-inch
(150 mm) connections shall be furnished with a four-inch (100 mm)
pumper nozzle only if steamer hydrants are called for on the plans.
| |
(2)
Recurring special provisions for water main improvements.
(a)
Coordination of work. The contractor shall coordinate
his/her operations with the City Water and Street Department. The
chlorination, pressure testing and sampling of the new mains shall
be done with City of Lexington Water and Street Department supervision.
All costs shall be included in the unit prices bid for the various
pipe items.
(b)
Pipelaying. Ductile iron pipelaying is to be
provided in accordance with the latest revisions to AWWA C-600 standards.
This takes precedence over any other specifications.
(c)
Laying operations. Contractor's attention is
directed to the fact that he/she must not allow any foreign material
to enter the main, such as tools, clothing, dirt, etc., while the
main is being constructed. At times when pipelaying is not in progress,
the open end of the pipe shall be closed by a watertight plug. All
trenches must be pumped dry preceding any pipelaying operations.
(d)
Water and sewer crossing. In cases where a water
main crosses a storm sewer or sanitary sewer and proper separation
cannot be provided, the contractor shall construct the sewer as outlined
in Division IV, Section 41-2.01C, of the Standard Specifications for
Water and Sewer Main Construction in Illinois, current edition. Should
the contractor elect to encase the water main in lieu of constructing
the sewer of water main quality pipe, the water main may be encased
with any approved water main quality pipe. Before starting either
of the above operations, the contractor shall notify the City Engineer
and have the method approved.
(e)
Retainer glands. Retainer glands shall be furnished
for all valves, except in-line valves, and all bends on the main line
greater than 11 1/4 (+ or -). Retainer glands shall be Megalug.
Internally restrained joint-type water mains may be used in lieu of
retainer glands.
(f)
Gate valve and box. Gate valves shall be Waterous
Series 500. The valve box shall be A.Y. McDonald with stay-put cover
or approved equal.
(g)
Steamer hydrants.
[1]
The unit price bid for a steamer hydrant shall
include all labor, material and equipment required to construct this
item in accordance with the hydrant connection type as shown on the
Standard Details in the plans, excluding the valve and box. The unit
price bid for a six-inch (150 mm) valve and box shall be paid for
all valves on hydrant leads in addition to the unit price bid or steamer
hydrant connection of type specified.
[2]
Where steamer hydrants are called for, they
shall have a 5 1/4 inch (133 mm) main valve of the compression
type that closes with pressure. They shall have an O-ring stuffing
box and a six-inch (150 mm) Ringtite or equal joint opening. The hydrant
opens by turning counterclockwise. Each hydrant shall have two 2 1/2
inch (63 mm) hose nozzles, and one four-inch (100 mm) pumper nozzle.
They shall conform in all respects to the Standard Specifications
of the American Waterworks Association for Fire Hydrants. They shall
be Waterous Pacer WB-67.
(h)
Setting hydrants. Each hydrant shall stand plumb
and shall rest on a precast solid concrete block base. Under and around
the drip of each hydrant shall be placed not less than one-third cubic
yard of broken stone not less than one inch (25 mm) in size. All fittings
and valves in connection with the fire hydrant shall be the anchored
type. No hydrant shall be placed closer than 2 1/2 feet (0.7
m) to back of curb or edge of pavement to the center line of hydrant.
(i)
Hydrant extension. The unit price bid for this
item shall include all labor, material, and equipment to adjust new
hydrants in the vertical direction above the standard five-foot (1.5
m) bury hydrant. This pay item will only compensate for those hydrants
shown on the plans requiring extensions and those hydrants installed
at a lower depth as directed by the Engineer in order to avoid conflicts
with existing utilities. All other hydrants requiring extensions after
installation not meeting these conditions shall be extended at the
contractor's cost. This work will be paid for by unit price bid per
vertical foot for hydrant extension. Extensions shall be made in six-inch
(150 mm) increments to the height required at each hydrant.
(j)
Setting tees and bends. All tees and bends shall
be restrained to adjacent pipe in accordance with recommendations
of DIPI.
(k)
Restrained joints. All joints as recommended
by DIPI shall be restrained. All restrained joints shall be Megalug.
(l)
Connections to existing mains. If the connection
to an existing water main requires a shutdown of the existing main,
the contractor shall notify all users of the affected main a minimum
of 48 hours ahead of the shutdown. The contractor shall rechlorinate
that portion of the existing water main which is shut down before
it is put back into service. The contractor shall provide the necessary
blocking or restraining of the existing main when he/she makes the
new connection.
(m)
Leakage test.
[1]
When performing a hydrostatic pressure test,
all water used must be potable and contain a chlorine residual of
not less than 0.2 parts per million of free chlorine or 0.5 part per
million of combined chlorine. The hydrostatic pressure test will be
made in accordance with ANSI/AWWA C-600, latest edition. The hydrostatic
pressure shall be 100 psi (620 kpa) for at least one-hour duration
and not vary more than five psi (35 kpa). Before applying the specified
test pressure, the air shall be expelled from the pipe. The allowable
leakage shall be determined by the following formula:
|
L = SDP
133,200
| ||||
|---|---|---|---|---|
|
L
|
=
|
allowable leakage in gallons per hour
| ||
|
S
|
=
|
length of pipe in feet
| ||
|
D
|
=
|
nominal diameter of pipe in inches
| ||
|
P
|
=
|
average test pressure during test in psis
| ||
[2]
All visible leaks are to be repaired regardless
of the amount of leakage. After the hydrostatic test has been successfully
completed, the main shall be flushed, attaining the minimum velocity
of at least 2 1/2 feet per second (0.75 mps). Flushing must continue
until all particulate matter and discoloration have been removed.
(n)
Flushing of new mains. There will be no charge
by the City of Lexington to the contractor for the water used to flush
the mains, provided it is not necessary to flush the mains more than
one time. If it is necessary to flush the mains more than one time,
then the contractor will be charged by the City of Lexington for water
used to flush the mains. The contractor shall provide and install
any hose necessary to direct the water being flushed away from any
area it might damage. The contractor shall take whatever precautions
necessary during flushing to prevent ecological damage to any receiving
stream, lake or other body of water.
(o)
Sampling and chlorinating taps. At the extreme
ends of the proposed new water main or at locations as directed by
the City Engineer, sampling and chlorinating taps shall be installed
by the contractor in accordance with the details as shown on the plans.
After the chlorinating, sampling and testing are approved by the City
of Lexington Water Department, the corporation stop shall be shut
off and the piping removed from the corporation stop.
(p)
Disinfection of mains. Disinfection shall be
in accordance with the Standard Specifications for Water and Sewer
Main Construction in Illinois.
(q)
Bacteriological testing.[2]
[1]
After disinfection, bacteriological testing
must be done to insure the public health of the main. All samples
must be collected by a designated sample collector of the City of
Lexington Water and Street Department and tested at an IEPA-approved
laboratory.
[2]
Water mains that fail the initial bacterial
test shall be flushed again before additional sampling is commenced.
If the second sample also fails the bacterial test, then disinfection
shall be repeated and flushing prior to additional sampling shall
be required. If the third sample fails the bacterial test, then the
next step shall be determined by the Water and Street Department and/or
City Engineer.
(r)
Trench backfill. Approved compacted granular
material shall be required in all trenches extending two feet (0.6
m) on either side of all sidewalks, driveways and street pavements.
(s)
Curb and gutter crossing. The contractor may
remove and replace the cub and gutter at the street crossings or he/she
may tunnel the curb and gutter at his/her option. All excavated material
shall be disposed of off site and the trench backfilled with approved
compacted granular material.
(t)
Pavement removal and replacement. All street pavement removal and replacement shall be done in accordance with § 195-66 of this article.
(u)
Damage to existing structures. If damage is
done to existing or new structures during construction of the proposed
improvement, they shall be replaced or repaired in a satisfactory
manner by the contractor at his/her own expense.
(v)
Utilities.
[1]
The utility companies shall be notified of the
impending project and the plans shall indicate the general location
of the utility main lines. The contractor shall have the responsibility,
before any construction work has begun, of obtaining from all utilities
the exact location of any underground facilities in the area of construction,
whether indicated on the plans or not. Any facilities disturbed by
the contractor shall be restored by him/her at the contractor's own
expense. The contractor shall coordinate with the proper utility the
relocation of any facility designated on the plans or deemed necessary
to be relocated by the Engineer in order to complete construction
of the project.
[2]
Residents shall be notified a minimum of 48
hours in advance of impending service outages, and no residence shall
be without service overnight.
G.
Standard details for the following are included at the end of this chapter:
|
Standard Drawing No.
|
Title
| |
|---|---|---|
|
A
|
Hydrant Installation
| |
|
B
|
Hydrant Connections
| |
|
C
|
Typical Concrete Blocking Detail
| |
|
D
|
Typical Water Service
| |
|
E
|
Sampling and Chlorination Service Piping Tap
| |
|
F
|
Creek Crossing Detail
| |
|
G
|
Anchorage of Fittings/Vertical Plane
| |
|
H
|
Water and Sewer Separation Requirements/Horizontal
| |
|
I
|
Water and Sewer Separation Requirements/Vertical
| |
|
J
|
Water and Sewer Separation Requirements/Vertical
(continued)
|
A.
Design standards. All developments shall be designed
so that streetlights are provided in such locations and in such manner
as to do and accomplish the following:
(1)
Provide a streetlight at every cross or tee intersection
and at the end of every cul-de-sac or eyebrow.
(2)
Provide such additional streetlights as may be necessary
so that streetlights are not more than 250 feet (75 m) apart.
(3)
Provide the type of illumination as selected by the
City Engineer meeting the following height and lumination standards:
(a)
Sodium vapor. An 8,700-lumen luminaire mounted
at a twenty-five-foot (7.5 m) mounting height shall only be utilized
on minor streets and frontage roads; a 23,000-lumen luminaire mounted
at a thirty-foot (9.0 m) mounting height shall be utilized on major
and collector streets.
(4)
In areas zoned R-1, streetlights shall be affixed
to ornamental concrete or aluminum poles.
(5)
In areas zoned for business, commercial or manufacturing
uses, streetlights shall be affixed to ornamental concrete or aluminum
poles.
(6)
In areas zoned R-1, all wiring shall be underground;
in areas zoned for business, commercial or manufacturing uses, underground
wiring shall be provided.
(7)
Private streetlights. All private streetlights in
a residential planned unit development shall meet City standards of
illuminance.
B.
Right-of-way and easement dedications. All streetlights
shall be installed in public easements or dedicated public rights-of-way.
Such easements and rights-of-way shall be of sufficient width and
the streetlights and required wiring shall be installed in such locations
therein that will not unreasonably interfere with other public utilities.
Easements or rights-of-way shall have a minimum width of 10 feet (3.0
m).
C.
Specifications and special provisions. Design and
installation shall meet or exceed all applicable City of Lexington,
Illinois Commerce Commission or accepted industry standards, whichever
imposes the more demanding requirement for the protection and preservation
of the public health, safety and welfare.
D.
Standard details for the following are included at the end of this chapter:
|
Standard Drawing No.
|
Title
| |
|---|---|---|
|
A
|
Typical Luminaire Installation
| |
|
B
|
Cable Trenching Detail
|
A.
Where streets or roadways in or adjacent to property
in a subdivision cross drainageways, streams or creeks, or where bridges
or culverts are otherwise proposed within the confines of a subdivision,
or on the roadway adjacent thereto, they shall be designed and constructed
in accordance with this section.
B.
Right-of-way dedication. Bridges and culverts shall
be located in dedicated public rights-of-way of sufficient width to
permit the construction, operation, maintenance and replacement of
the improvement within the confines of the dedicated right-of-way
without relocation or other unreasonable interference with other public
utilities located therein.
C.
Design standards.
(1)
Bridges and culverts shall be of width comparable
to the abutting street or roadway, including sidewalks and trails.
(2)
In the case of culverts or bridges over waterways,
such crossing shall be of sufficient size to permit the volume of
water reasonably expected from a thirty-year-frequency storm event
on the area in the natural drainage area flowing into the stream if
that area were developed to the types of uses and to the maximum density
permitted by the then-existing City zoning ordinance with respect
to property within the corporate limits of the City and the land use
element of the City's Comprehensive Plan for the areas outside the
corporate limits.
(3)
Bridges and culverts shall meet or exceed all applicable
City, Illinois Department of Transportation, Illinois Department of
Natural Resources, other local, state or federal regulatory authority
and accepted industry standards, whichever impose the most demanding
requirements with respect to the preservation and protection of the
public health, safety and welfare. Should the City desire to expand
or enlarge any of these improvements to meet anticipated growth, then
the City shall pay for the increment due to the expansion, provided
funds are available.
D.
City's participation in cost.
(1)
Bridges and culverts. Where installation of a bridge
or culvert of a larger capacity or width than required to serve land
owned by the developer is required by the City Council to serve future
growth in the vicinity of the development, the developer shall pay
for only his/her portion of the total cost of construction, with the
balance to be paid by the City, provided funds are available.
(2)
Engineering costs. The developer will be responsible
for all engineering costs for design of bridges and culverts within
his/her development.
E.
Specifications and special provisions. All bridges
and culverts shall be constructed in accordance with all applicable
sections of the Illinois Department of Transportation Standard Specifications
for Road and Bridge Construction, the current edition as then modified,
supplemented and amended by this chapter or the City Engineer.
A.
Where streets or roadways in or adjacent to property
in a subdivision cross a railroad line, or where a railroad line is
otherwise proposed within the confines of a subdivision, or on the
roadway adjacent thereto, they shall be designed and constructed in
accordance with this section.
B.
Right-of-way dedication. Railroad crossings shall
be located in dedicated public rights-of-way of sufficient width to
permit the construction, operation, maintenance and replacement of
the improvement within the confines of the dedicated right-of-way
without relocation or other unreasonable interference with other public
utilities located therein.
C.
Design standards.
(1)
Railroad crossings shall be of width comparable to
the abutting street or roadway, including sidewalks and trails.
(2)
Railroad crossings shall meet or exceed all applicable
City, Illinois Department of Transportation, Illinois Commerce Commission,
other local, state or federal regulatory authority and accepted industry
standards, whichever impose the most demanding requirements with respect
to the preservation and protection of the public health, safety and
welfare. Should the City desire to expand or enlarge any of these
improvements to meet anticipated growth, then the City shall pay for
the increment due to the expansion, provided funds are available.
A.
All public and quasi-public utilities, including without
limitation gas lines, electrical lines, telephone lines and cable
TV transmission lines, shall be located underground.
B.
Easement and right-of-way dedication. Except for individual
building or property services, utility lines shall be located in public
easements or dedicated public rights-of-way. Such easements or rights-of-way
shall be of sufficient width and the utilities shall be installed
at such locations therein as to permit open cut installation, maintenance
and repair within the confines of the easement or right-of-way without
relocation or other unreasonable interference with other public or
quasi-public utilities located therein, provided that no permanent
structures shall be placed over the easements or rights-of-way dedicated
to the City. Fences and vegetative material may be placed on easements,
but if it becomes necessary to repair or inspect the underlying utility,
the fence or vegetative material may be removed, damaged or destroyed
at the expense of the property owner. Under no circumstances will
the City be responsible for the repair or replacement of anything
placed upon an easement. The City staff will make every possible effort
to notify property owners that items placed upon an easement need
to be relocated or removed, with one notable exception, which is for
emergency repairs.
C.
Design standards.
(1)
Front yard electrical transformers shall not be located
above ground in front yard easements or dedicated rights-of-way.
(2)
Side yard electrical transformers may be located above
ground when the transformer is located behind the building setback
line.
(3)
Easements or rights-of-way shall have a minimum width
of 10 feet (three m) plus five feet (1.5 m) for each additional utility
to be provided.
D.
Specifications and special provisions. All utility
installation shall conform with the applicable City, Illinois Commerce
Commission, regulatory authority or accepted industrial standards,
whichever impose the highest and most demanding requirements for the
preservation and protection of the public health, safety and welfare.
All gas, electric, phone, and cable TV lines shall be located 1.5
meters (five feet) away from water mains and sewers lines and 1.5
meters (five feet) away from water and sewer services.
A.
The intent of this section is to require erosion control
and stormwater practices that will reduce the amount of sediment and
other pollutants leaving development sites, both during and after
construction, and reduce the impact of development on erosion in receiving
streams. It is also the intent of the section to promote design and
construction practices that minimize ground disturbances during development;
maintain natural drainage; and provide stormwater storage. Erosion,
sediment, and stormwater control measures are needed for the following
reasons:
(1)
High rates of soil loss may occur from areas undergoing
development for nonagricultural use, including, but not limited to,
the construction of dwelling units, commercial buildings, industrial
plants, and public works.
(2)
The washing, blowing and falling of eroded soil across
and upon roadways endanger the health and safety of users thereof
by decreasing vision and reducing traction of road vehicles.
(3)
Soil erosion necessitates the costly repair of gullies,
washouts, embankments, drainage structures, and stream banks.
(4)
Sediment from soil erosion can clog or reduce the
flow and storage capacity of sewers, ponds, ditches, and streams.
(5)
Sediment and associated pollutants can pollute the
waters of streams, ponds, lakes, and rivers, creating far-reaching
biological impacts to aquatic life and species dependent upon aquatic
life.
(6)
Sediment limits the use of water and waterways for
beneficial uses, including water supply, navigation, recreation, fishery
resources, drainage, and flood control.
(7)
Development, if not controlled, causes increases in
peak stormwater runoff rates which can lead to increased stream bed
and stream bank erosion and flooding in receiving streams.
(8)
Erosion and stream bank instability caused by altered
stream flow rates due to development can create unsafe conditions,
adverse environmental impacts, and other conditions that require costly
repairs or preventative measures to protect private and public structures
and facilities.
B.
Applicability.
(1)
No land surface shall be disturbed unless an erosion
control plan has first been submitted and approved for that activity,
except as follows:
(a)
Land-disturbing activities for which the disturbed
area is less than 5,000 square feet; or
(b)
Current agricultural practices involving land
tilling.
(c)
Construction of one single-family dwelling which
is not constructed as part of a residential subdivision shall be subject
to the provisions of this section regarding stormwater control measures.
(2)
The City Engineer reserves the right to require any
nonagricultural construction activity, regardless of land disturbance
area or type of activity, to comply with this chapter if it is determined
to be the cause of, or a contributor to, an existing or potential
adverse erosion, sediment, or stormwater impact.
C.
Design standards.
(1)
The EPA's NPDES Phase II rules apply, including completing
and submitting a notice of intent (NOI), developing and implementing
a stormwater pollution prevention plan, completing final stabilization
of the construction site, and completing and submitting a notice of
termination (NOT).
(2)
All temporary sediment control measures shall be designed
to control sediment from leaving the development site for a five-year-frequency
storm event.
(3)
Design standards for erosion and sediment control
measures shall comply with provisions of the Illinois Procedures and
Standards for Urban Soil Erosion and Sediment Control, published by
the Urban Committee of the Association of Illinois Soil and Water
Conservation Districts, latest edition, unless otherwise stated by
this section.
D.
Temporary stormwater control measures.
(1)
On-site sediment control measures shall be constructed
and functional prior to initiating clearing, grading, stripping, excavation
or fill activities on the site.
(2)
Sediment control measures and temporary stormwater
control measures are to be maintained so they are operating effectively
until permanent ground surface protection and permanent stormwater
control measures are established.
(3)
The City Engineer may require additional control measures
as necessary after site inspection if sedimentation controls are not
functioning properly.
E.
Temporary ground surface. All lots not built within
21 days of ground disturbance shall have ground surface seeded within
seven days.
F.
Permanent ground surface. Within seven days after
completion of suitable construction and soil conditions, and before
final inspection, the site must have permanent ground surface cover
planted or installed. Public improvements will not be accepted until
all public rights-of-way and easements have permanent ground surface
cover.
A.
The purpose of this section is to establish criteria
and guidelines for the development of neighborhood parks within future
developments. This section is designed to assist developers, planners,
and engineers in the location, shape, access, linkage, grading and
seeding of park lands to be dedicated for park purposes.
B.
Neighborhood park standards.
(1)
Size. The size of a neighborhood park site shall be
appropriate to the leisure and recreational needs of the service population
and shall be consistent with required donations. The following illustrates
the amount of land area generally required for a neighborhood park:
(a)
Neighborhood park: minimum of seven acres.
(2)
Shape. Generally, park sites should be rectangular
or nearly rectangular in shape.
(3)
Location. Whenever possible, park sites should be
located near the geographic center of the service areas. In areas
where park sites and/or school sites already exist or have been previously
planned, the proposed park donation shall be located adjacent to or
provide appropriate linkage with the existing sites. The following
plan shall be adhered to in determining the locations of park sites:
the City of Lexington Comprehensive Plan.
(4)
Access. Access to park sites shall be provided for
convenient pedestrian and vehicular ingress and egress as well as
for visual identity. A minimum of 300 feet of street frontage will
be required, measured along the curb. Any accessway shall be improved
with a hard-surfaced walkway 1.2 meters (four feet) in width, constructed
in accordance with this chapter. The number of accesses will vary
with the location and type of park site and its relationship to surrounding
land uses. Frontage along a major road may be counted as an access
point when sidewalks along that major road are present. All access
to park sites shall meet current American with Disabilities Act (ADA)
requirements.
(5)
Linkage. The linkage of proposed parks with existing
parks or with other desirable land uses (i.e., schools, convenience
commercial areas, cultural or institutional centers) shall be encouraged.
(6)
Grading. The proposed grading of a park site shall
be suitable for park purposes and shall not differ greatly from that
of surrounding land uses. Grades less than 2% or more than 10% will
not be acceptable. Exceptions to this may be granted if the developer
can show an acceptable secondary use for the grading. Examples are
earth berming for visual buffer or aesthetic interest, a sled hill
or toboggan run, backstop for special activities, amphitheater, etc.
(7)
Vegetation. Land donated for park purposes shall be
planned and designed to minimize impact to vegetation of ecological
or aesthetic value. Existing vegetation of value shall be adequately
identified and protected from damage during the construction process.
The City shall be given the right to remove/salvage from an area proposed
for clearing any desirable plant materials for which the developer
has no intended use.
(8)
Erosion control. The developer will be responsible
for controlling erosion in accordance with this chapter on the park
sites until final acceptance of improvements by the City.
(9)
Retention/Detention (if part of a recreational facility).
(a)
Retention.
[1]
Water quality criteria. Water quality criteria
adopted by the Illinois Pollution Control Board will be used as the
basis for evaluating the quality of ponded water.
[2]
Water quality maintenance. The developer shall
provide plans for aeration, chemical treatment, or other means to
ensure water quality standards are maintained.
[3]
Pond design.
[a]
Slopes from bank: top one meter
(three feet) of normal pool and the total depth of the required detention
volume shall have a 6:1 slope; then 3:1 to bottom.
[b]
In areas selected for the planting
of aquatic and emerging aquatic vegetation, slope requirements will
change with cultural requirements of vegetation type.
[c]
Depth: minimum of 25% of normal
water level area is to be three meters to five meters (10 feet to
15 feet) in depth.
[d]
Shape. Pond configuration shall
be natural in appearance featuring varying slopes running down to
the shoreline. The shoreline shall undulate at varying degrees around
the pond perimeter. Provisions in configuration of pond shall allow
for ease in dredging and other maintenance considerations.
[e]
Size. No ponds shall be smaller
than one acre.
[f]
Bank stabilization. Protection
against erosion and water level fluctuations is required. Stabilization
may be provided through the following means:
[i]
Complete establishment of perennial
ground cover with water-tolerant grasses.
[ii]
Construction of retaining walls.
[iii]
Use of rip-rap underlain by gravel
placed in the zone to be exposed during seasonal water fluctuations.
Minimum zone to be covered is one meter (three feet) above normal
water level and two meters (six feet) below the normal water level.
[g]
Management.
[i]
Draw-down facilities shall be provided
to allow for the complete drainage of the lake. Draw-down capability
is necessary to facilitate fish management and lake cleaning.
[ii]
Sedimentation.
[A]
The developer will provide engineering plans estimating probable
quantities of sediment coming off the watershed at five-year intervals.
The developer will then install sediment traps to handle the aforementioned
sediment. A cleaning/dredging plan shall be included. All engineering
and installation is to be approved by the City of Lexington.
[B]
Retention basin designs shall comply with the stormwater standards
of this chapter.
(b)
Detention. Detention basin design shall comply
with the stormwater section of this chapter. The major consideration
in the design of a detention basin being proposed for recreational
use is its suitability for dual use of land: detention and recreation.
In order to facilitate review of park areas, the proposed outline
of the detention at the approximate high water line shall be illustrated
on the preliminary plan. City-maintained detention basins shall have
pipe underdrains in accordance with the stormwater section of this
chapter.
(c)
Park site credit. For retention and detention
basins, the extent to which the design standards are adhered to will
be the basis by which the amount of parkland credit will be determined.
A reduced amount of parkland credit may be granted should a proposed
park site be deficient in one or more of the above-cited park design
standards.
C.
Improvement standards and specifications. The park
site shall be improved according to the following standards and specifications
(park sites shall be final platted park sites):
(1)
Utilities. The park site shall be fully improved with
water, wastewater disposal, storm sewer, and electric service. At
the time of installation of public improvements in the subdivision
or planned unit development, the developer shall install the above-mentioned
utilities for the park site in accordance with the City-approved engineering
plans. This work shall be completed prior to the issuance of the first
occupancy permit in the subdivision or planned unit development which
includes said park site. If the park site has an auxiliary function
as a stormwater control facility, then the drainage structures shall
be installed during rough grading at the beginning of construction
activities.
(2)
Grading. The park site should be rough graded in a
similar manner as adjacent lots. Rough grading should take place at
the time of rough grading of adjacent lots for the purpose of building
construction, and be completed before occupancy permits are issued
within the subdivision or planned unit development. Grading shall
be done in accordance with the grading plans prepared in compliance
with this section, and approved by the City. Grading shall include
the preparation of the subsoil so that it is graded and uniformly
compacted so it will be parallel to the proposed finished grade. The
subgrade material shall be loosened and fine graded to a depth of
two inches to four inches, and all stones over four inches in size,
sticks, rubbish and other foreign substances shall be removed. All
depressions which may cause future drainage problems shall be filled
with acceptable subgrade material. Positive drainage must be ensured
in the direction of swales, or as indicated on a master drainage plan.
Finished grades should be uniform of slope between points for which
elevations are given, or from such points to existing slopes. Note:
The long-term storage of overburden on a park site is prohibited,
though temporary storage may be granted in some cases. Terms of such
temporary storage shall be determined by the City.
(3)
Topsoil. At the time topsoil is first placed in the
subdivision or planned unit development, it shall also be spread on
the park site. Topsoil shall be fertile, friable, natural topsoil
typical of topsoil free of flooding. It shall be without a mixture
of subsoil or slag and shall be free of stones, sticks, rubbish, and
other extraneous matter, and shall not be delivered or used while
in a frozen or muddy condition. Topsoil shall not contain toxic substances
which may be harmful to humans or to plant growth. Topsoil shall be
spread evenly and lightly compacted to a minimum depth of six inches.
Humps or depressions shall be graded and rolled until satisfactory
grade is obtained. Completion of fine grading shall be within six
months of the completion of rough grading.
(4)
Seeding.
(a)
Seeding operations should occur during the spring
(between March 1 and May 15) or, preferably, late summer (August 20
to September 30). The seed mixture shall be a mixture of 70% Kentucky
Bluegrass, 20% Perennial Rye Grass (Citation, Manhattan or Penfine)
and 10% Chewing Fescue. All seeds shall be certified 98% purity/80%
germination. The seed bed shall be fresh, VW new crop seed. The method
of seeding may be varied at the discretion of the developer as long
as a smooth, uniform and stabilized turf is established; the developer
shall be required to maintain turf to full establishment.
(b)
This work shall occur immediately after the
placement of topsoil, fine grading and installation of sidewalks.
D.
Maintenance standards.
(1)
The park site shall be maintained by the developer
until the improvements as specified in this chapter have been formally
accepted by the City. Maintenance of the park site shall include:
(2)
Until such time as a park site has been accepted by
the City, the developer may be held liable for any damages that may
occur on such a park site. Upon formal acceptance of the park site
improvements by the City, the City will assume maintenance of the
park site.
