A.
The street layout shall be designed to create desirable building
sites while respecting existing topography, minimizing street grades,
avoiding excessive cuts and fills, and preserving trees and other
natural features to the maximum extent possible. Thoughtful and imaginative
design of streets and their relationship to the arrangement and shape
of lots is required. An important element is the blending with topography
to produce curvilinear design and reasonable grades. The rectilinear
design of streets and lots, involving long straight sections of street,
should be avoided.
B.
Streets shall be spaced to allow for blocks meeting the dimensional
requirements contained herein and to minimize the number of intersections
with existing or proposed major thoroughfares.
C.
Where the subdivision or land development adjoins or embraces any
part of a Town-owned major thoroughfare, the layout of such subdivision
or land development shall provide for the platting and dedication
of such part of the major thoroughfare in the location and at the
width indicated, except that the applicant shall not be required to
dedicate that part of such major thoroughfare which is in excess of
60 feet in width (30 feet from the center line on either side of the
right-of-way). If the existing right-of-way is less than 60 feet in
width (30 feet from the center line on either side of the right-of-way),
the applicant shall be required to provide additional right-of-way
to meet the sixty-foot width (30 feet from the center line on either
side of the right-of-way) requirement. The applicant may, however,
be required to reserve any excess over 60 feet for future acquisition
by the Delaware Department of Transportation (DelDOT) for state-owned
major thoroughfares.
D.
Where deemed desirable to the layout of the subdivision or land development
and adjoining areas, the Town may require the platting and dedication
of one or more collector streets, or parts thereof, to serve the subdivision.
E.
Minor streets, intended primarily for access to individual properties,
shall be so arranged as to discourage their use by through traffic.
F.
Proposed collector streets in the subdivision shall provide for the
continuation of existing, planned, or platted streets on adjacent
tracts, unless such continuation shall be prevented by topography
or other physical condition, or unless such extension is found by
the Town to be unnecessary for the coordination of development between
the subdivision or land development and such adjacent tract. When
deemed advisable, the Town may restrict access to proposed collector
streets from abutting properties.
G.
All streets shall be constructed to meet the standards and specifications
of DelDOT. Street names must be approved by the Town Council and reviewed
by the County 911 Addressing and Mapping Department.
H.
Where the Town deems it desirable or necessary to provide access
to adjacent tracts not presently subdivided, proposed collector streets
in the subdivision shall be extended to the boundary lines with such
adjacent tract, and temporary turnarounds shall be provided within
the subdivision or land development at the ends of such streets, by
means of temporary easements or otherwise.
I.
Where the subdivision or land development abuts or contains a major
thoroughfare, the Town may require that measures be taken to reduce
the impact of heavy traffic on the residential lots abutting or fronting
upon such highway and to afford separation of through and local traffic
by one of the following measures:
(1)
By providing vehicular access to such lots by means of a service
drive separated from the major thoroughfare by a planting strip at
least 30 feet in width and connecting therewith at infrequent intervals.
(2)
By designing reverse frontage lots having access only from a parallel
minor street or from cul-de-sac or loop streets, and with vehicular
access to such lots from the major thoroughfare prohibited by deed
restrictions or other means. The choice of the most appropriate method
of accomplishing the desired purpose in a specific instance shall
be made by the Town, giving consideration to topography and other
physical conditions, the character of existing and contemplated development
in the subdivision and its surroundings, and other pertinent factors.
J.
Cul-de-sac streets, generally not exceeding 600 feet in length, shall
be permitted where they are necessitated by topographic conditions
or where, in the judgment of the Town, they are appropriate to the
type of development contemplated.
K.
Private alleys shall be provided in commercial and industrial areas,
unless adequate access to parking and loading area is provided by
other means. Private alleys may not be permitted in residential areas,
except for the purpose of providing rear access to row dwellings or
where required by topographic or other unusual conditions. In the
absence of private alleys, easements will be required for utility
lines or drainage facilities.
L.
Except as hereafter provided, there shall be no private streets platted
in any subdivision, and every subdivided property shall be served
from a publicly dedicated street.
M.
Prior to occupancy of the first dwelling unit, the road base and
binder course shall be placed. The wearing course and all other aspects
of the street improvements shall be completed by the applicant prior
to occupancy of 100% of the dwelling units.
N.
No street referred to herein shall be dedicated to the Town of Ocean
View nor accepted for dedication by the Town of Ocean View unless
the street shall have been constructed in accordance with DelDOT standards
and specifications.
A.
Purposes. The purpose of this section is to:
(1)
Provide for roads of suitable location, width, and improvement to
accommodate prospective traffic and afford satisfactory access to
police, fire-fighting, snow removal, sanitation and road maintenance
equipment.
B.
The site plan showing the right-of-way for the internal street system
shall be drawn in accordance with the requirements of the Town of
Ocean View. The widths of the right-of-way shall be as follows:
(1)
Minor streets: 50 feet for minor streets (fewer than 500 ADT).
(2)
Minor collector streets: 60 feet (500 to 3,000 ADT).
(3)
Major collector streets: 60 feet (over 3,000 ADT).
(4)
Alleys: 26 feet.
(5)
Major collector streets: 70 feet (multifamily residential areas,
commercial and industrial area).
(6)
In all other cases, the minimum right-of-way shall be the paved width
of the street and an additional 10 feet on each side of the street.
C.
Roadway widths for streets and roadways shall be as follows:
(1)
In single-family residential areas and service drives, minor streets
shall have a width of 30 feet and minor collectors and major collectors
shall be 36 feet wide.
(2)
In multifamily residential areas, commercial and industrial area,
collectors shall have a paved width of 36 feet, excluding the width
of the curbs.
(3)
Alleys shall have a paved width of 16 feet.
(4)
All roadway widths shall be the width of the paved surface. On streets
with curbs, the width shall be measured from inside face of curb to
inside face of curb.
D.
Cul-de-sac streets shall have a circular paved turnaround of not
less than 80 feet paved diameter. A T- or Y-configuration may be used
if approved by the Town.
E.
Street grades shall be designed in conformance with the following
requirements:
(1)
Street grades shall not be less than 0.5% or greater than 7.0%, unless
otherwise approved by the Town.
(2)
Changes in grade exceeding 1% shall be effected by vertical curves,
which shall require a vertical curve length of 25 feet for each one-percent
change in grade differential, and which shall maintain the clear sight
distances required. Vertical curves shall not produce excessive flatness
in grade.
(3)
Where the grade of any street at the approach to an intersection
exceeds 3%, a reduced grade, not exceeding 3%, shall be provided for
a distance of 75 feet, measured from the nearest right-of-way line
of the intersecting street, unless otherwise approved by the Town.
(4)
The maximum grade within any intersection, measured from the respective
right-of-way lines, shall not exceed 3%, unless otherwise approved
by the Town.
(5)
A combination of minimum-radius horizontal curve and maximum grade
is not permitted.
F.
Street alignment shall be designed in conformance with the following
requirements:
(1)
Whenever street lines are deflected in excess of 5%, connection shall
be made by horizontal curves.
(2)
Proper sight distances measured from a height of 3.5 feet shall be
provided with respect to both horizontal and vertical alignments.
Measured along the center line at a height of 3.5 feet, this shall
be at least 250 feet.
(3)
Horizontal curves shall have a minimum center-line radius of 300
feet on major collector streets, 200 feet on minor collector streets
and secondary streets and 150 feet on minor residential streets. A
long radius curve shall be used rather than a series of curves connected
by short tangents. Minimum radius curves at the end of long tangents
shall be avoided.
(4)
A center-line tangent of at least 100 feet shall be required between
reverse curves for all streets.
(5)
Approaches to an intersection shall be straight for a distance of
100 feet from the nearest right-of-way line of the intersecting street,
unless otherwise approved by the Town.
G.
Street intersections shall be designed in conformance with the following
requirements:
(1)
Right-angle intersections shall be used whenever practicable, particularly
where local residential streets intersect with major streets. Angles
less than 90° must be approved by the Town. In no case shall the
intersection angle be less than 70° for a minor street or 80°
for a collector.
(2)
No more than two streets shall cross at the same point.
(3)
Each property corner at street intersections shall be rounded off
by an arc. Curbs at street intersections shall be rounded off concentrically
with the property lines. Minimum curb or edge of pavement radii shall
be provided in accordance with the following:
(4)
Right-of-way lines at intersections shall be rounded by a tangential
arc that is concentric with the paved radii lines and have a minimum
radius of the paved radii plus an additional 10 feet.
(5)
Proper sight lines shall be maintained at the intersections of all
streets. Clear sight triangle shall be measured along the center lines
of intersecting streets to a point 75 feet from the center of the
intersection.
(6)
Signage shall be in accordance with the Manual on Uniform Traffic
Control Devices (MUTCD) as adopted by DelDOT.
A.
Entrances shall be placed to provide safe access to the site while
providing the least impact on the existing roadway system. Entrances
shall be located to provide the required sight distance, in accordance
with AASHTO (American Association of State Highway and Transportation
Officials) standards, where the highway alignment and profile are
favorable, where there are no sharp curves or steep grades, and where
sight distance in conjunction with the access is adequate for safe
traffic operation.
B.
If a proposed development has frontage on two roads, access shall
be provided from the lower volume road. Considerations for the placement
of entrances should include evaluation of sight distance, location
of adjacent entrances, and distance from intersecting streets. Where
feasible, entrances shall not be located within 40 feet of an intersection
radius or on acceleration and deceleration lanes.
C.
Site circulation should be designed to allow vehicles to easily enter
the site, not block entrances and not be impacted by traffic control
devices or parking spaces.
D.
The design elements required for a specific entrance shall be constructed
within the existing right-of-way or easements of the roadway. If the
right-of-way cannot accommodate the required entrance improvements,
the developer can either acquire the necessary right-of-way or reduce
the traffic generated from the site to eliminate the need for the
improvement. Insufficient right-of-way cannot be the basis for substandard
design.
E.
Entrance design shall be in accordance with the following guidelines:
(1)
All entrance-exit facilities shall conform to designs intended exclusively
for that purpose. No signs that are contrary to the normal rules of
the road (e.g., keep left instead of keep right, etc.) shall be permitted.
(2)
If pedestrian amenities exist or are placed as part of the land development,
the entrance shall be designed to accommodate pedestrians.
(3)
Median islands shall be permitted in the entrance. The median shall
have a maximum width of 12 feet measured from the face of curb. The
nose of the median shall be located based on the turning path for
the left-turn movement of the design vehicle.
(4)
All entrance-exit facilities shall be located to provide not only
compatibility with the highway system and adjacent entrances, but
also to provide good internal circulation once the motorist has left
the roadway. The site shall be designed so that traffic will not back
up on the roadway.
(5)
If an entrance is to be controlled by an electronic gating system,
the gate shall be located a minimum of 50 feet from the edge of the
shoulder.
(6)
Where feasible, a major entrance-exit facility on one side of a highway
shall be located directly across from a major entrance-exit facility
on the opposite side of the highway.
(7)
Right-turn (deceleration) lanes shall be provided in accordance with
the DelDOT Standards and Regulations for Subdivision Streets and State
Highway Access Manual.
(8)
Entrance width shall be consistent with the type of subdivision street
intersecting the roadway.
(9)
The radius of the entrance shall be established using the turning
path of the design vehicle. A minimum radius of 25 feet shall be used
on all entrances.
(10)
Profiles of entrances and exits shall be designed in accordance
with DelDOT Standards and Regulations for Subdivision Streets and
State Highway Access, and AASHTO's standards. Maximum grades shall
not exceed 7%. Vertical curve transition shall be provided at the
intersection of the driveway profile and the cross slope of the roadway
shoulder extended.
(11)
All parking and unparking maneuvers within the immediate area
of a commercial entrance shall be avoided. These maneuvers shall not
block the entrance and cause the backing up of traffic onto the highway.
(12)
No driveways or parking bays shall be located within 40 feet
from the edge of the shoulder or pavement of any type of functional
classification roadway.
(13)
The minimum distance between the intersection radius of the
entrance with the Town-maintained roadway shoulder and the property
line of the adjacent property is five feet.
(14)
Maintenance of Traffic (MOT) plans prepared in accordance with
DelDOT and MUTCD standards shall be submitted to the Town for all
entrances accessing Town-maintained streets.
F.
When an entrance is provided, the area adjacent to the right-of-way
shall be clear and free of obstructions. When approaching an intersection,
a driver should have an unobstructed view of the intersecting roadway
and the ability to view any approaching vehicles at the intersection
according to the following standards:
(1)
The entrance location and design shall provide a clear line-of-sight
for the driver of a vehicle preparing to enter the roadway in accordance
with AASHTO location and design standards.
(2)
Any marquee sign must be placed to maintain the required sight distance.
(3)
If the sight triangle established in accordance with the AASHTO standards
is outside the existing right-of-way, an easement shall be established
to maintain the required sight distance.
(4)
At subdivision entrances, the sight triangle shall be maintained
and be free of plantings that could obstruct the sight distance.
(5)
Within the streets of a subdivision, the placement of shrubbery or
other visual barriers is prohibited within the triangular area formed
by the intersection of two curblines and a line joining the respective
points on each of these lines at a distance of 30 feet from the point
of intersection. These triangular areas shall be designated on the
site plans as sight triangle easements. The Town shall have full authority
to maintain the required sight distance. Fire hydrants shall not be
considered visual barriers or hazardous obstacles.
G.
Where, in the opinion of the Town, a proposed subdivision or land
development will generate such additional traffic on abutting and
nearby state or Town roads of substandard specifications as to pose
a hazard to public safety, the Town may require improvements (including
widening and improvement to horizontal or vertical alignment) to be
made by the applicant, including off-site improvements within existing
public rights-of-way, such as will alleviate such hazards to public
safety, provided that the extent of required off-site improvements
shall be economically feasible in relation to the size and scope of
the proposed subdivision or land development.
H.
When required by the Town, the developer shall prepare an operational
analysis for review by the Town Engineer. This operational analysis
may consist of but not limited to one or more of the following evaluations:
(1)
Queuing analysis. This analysis may be required to determine whether
the existing and proposed left-turn lane at the site entrance and
nearby intersections is adequate. The 95th percentile maximum queue
shall be used for the purpose of this analysis.
(2)
Highway Capacity Manual analysis. This analysis may be required to
determine whether the operation of the site entrance and nearby intersections
is adequate.
(3)
Accident analysis. This analysis may be required if the entrance
is proposed at a known or alleged high accident location to determine
whether a problem exists, and if so, how the entrance might relate
to the problem, and what remedies might be possible.
I.
This information from the operational analysis shall be used to determine
what modifications or improvements need to be made to ensure safe
access to the Town-maintained roadway system.
J.
All entrance permits for entrances accessing state-maintained roadways
shall be approved by DelDOT.
A.
All streets, alleys and entrances to driveways and parking areas
within the Town right-of-way that are intended to be conveyed to the
Town of Ocean View for perpetual maintenance shall be designed and
constructed in accordance with the following standards:
B.
A soils investigation performed by a geotechnical engineer registered
in the State of Delaware with experience in pavement engineering shall
be required for the purpose of obtaining information needed to design
the proper pavement section for all proposed streets within any subdivision
or other land development project.
(1)
Boring locations, sampling procedures and method of testing shall
be approved by the Town. Pavement designs based on assumed poor soil
conditions do not require a soils investigation, unless in the opinion
of the Town Engineer, weak subgrade may exist in the area of the proposed
roadway. In such situations, the Town Engineer may require additional
testing to determine the actual strength of the soil (CBR or Resilient
Modulus) and perform a detailed pavement design in accordance with
the 1993 AASHTO Pavement Design Guide. In any case, the developer
shall be responsible for stabilizing all weak and wet subgrade prior
to construction of the crushed aggregate base course.
(2)
At a minimum, at least one boring for every 300 linear feet of street,
with a minimum of three borings for each proposed street. The spacing
of the borings shall be relatively uniform and alternate from one
side of the street to the other side. Borings shall be within the
area of the proposed street and be located in such a manner that all
questionable areas (i.e., depressions, wet/weak areas, old streambeds,
etc.) are investigated. Borings shall be made to a depth adequate
to sample soils at least six feet below the subgrade of the proposed
pavement system. If extremely poor soils are discovered or anticipated
to be below the minimum sampling depth, the soil borings shall continue
in order to determine the extent of the weak layer. The Town reserves
the right to make a verification survey as part of the review of the
developer's investigation work.
(3)
Results of the soil investigation submitted to the Town shall include
the following:
(a)
A plan view of the proposed subdivision streets showing all
boring locations.
(b)
Boring logs containing the required data specified below.
(c)
AASHTO soil classification for each foot of boring taken.
(d)
A profile view of each proposed street with borings plotted
to scale showing AASHTO classification of soils encountered.
(e)
Testing soils testing shall be in accordance with the latest
procedures found in the DelDOT Materials Manual.
(f)
Boring logs. A log of each boring shall be kept, recording the
following information:
(g)
Water level. When water is encountered, borings shall be left
open until the water level stabilizes and then the depth to water
shall be recorded.
(h)
Soil stratum. Soil shall be sampled by stratum. At each soil
composition change, a sample, sufficient in size to perform the required
laboratory testing shall be obtained.
(4)
The following laboratory tests shall be performed on the materials
sampled from each stratum encountered in the individual borings:
(a)
Dry preparation of disturbed soil and soil aggregate samples
for tests: AASHTO T87*.
(b)
Particle size analysis of soils: AASHTO T88*.
(c)
Determining the liquid limit of soils: AASHTO T89*.
(d)
Determining the plastic limit and plasticity index of soils:
AASHTO T90*.
(e)
Amount of material in soils finer than the Number 200 sieve
(ASTM Designation D-2216).
(f)
Method of laboratory determination of water content of soils
(ASTM Designation D-2216).
(5)
Methods that deviate from any of the above procedures must be submitted
to the Town Engineer for approval.
(6)
Results of the soil investigation submitted to the Town should contain
the following information:
(a)
A plan view of the proposed streets showing boring locations.
(b)
Logs containing the required data for all borings made.
(c)
Test results of all laboratory tests performed.
(d)
A profile view of each boring plotted to scale showing the AASHTO
classification of soils encountered.
(e)
Pavement design by the geotechnical engineer.
C.
Whether the developer utilizes good or poor soils for the pavement
design, if weak or wet areas are suspected or encountered during construction,
the Town reserves the right to require additional borings and testing.
If the soils are found to be extremely weak with a soil resilient
modulus of less than 4,500 psi (or CBR < 3), the Town reserves
the right to require an in-depth soils strength analysis and a specific
pavement design that will satisfactorily address the specific situation.
D.
In the event that streets are to be constructed in areas that require
the removal of unsuitable material, the Town reserves the right to
request an investigation to determine the extent of the unsuitable
material to be removed.
E.
Pavement construction material and thickness requirements.
(1)
Pavements shall be designed based on the soil conditions and the
number of residential units or building floor space for commercial
and industrial developments. All proposed streets shall be constructed,
at a minimum, to the required type of materials and thickness of layers
as specified in Table 1 and Table 2. If any street is expected to
serve additional traffic in the future, such as an extension to a
future development or tie-in to another development, the anticipated
future increase in traffic shall be incorporated into the design.
(2)
All soils that clearly fall within the A-1, A-2, and A-3 AASHTO soils
classifications shall be considered "good soils." All soils that fall
within the A-4, A-5, A-6 and A-7 AASHTO soils classifications shall
be considered "poor soils."
(3)
For developments larger than 500 residential units or 2,000,000 square
feet of industrial/commercial building space, or when the soil has
a CBR value less than 3.0, the developer shall contact the Town for
pavement design requirements necessary to meet the specific situation.
The Town Engineer will provide guidance with regard to the necessary
design inputs (i.e., present serviceability index, probability, overall
standard deviation, drainage coefficient, etc.) for the detailed design.
A.
All streets and entrances to driveways and parking areas shall be
constructed, both in materials and methods, in conformance with the
provisions set forth herein, together with all applicable portions
of the DelDOT construction standards, latest edition and be approved
by the Town Engineer prior to acceptance by the Town Council.
B.
Subgrade shall be prepared to accommodate the placement of the pavement
structure and shoulders or gutters in accordance with DelDOT Construction
Standards, and within reasonably close conformity to the lines, grades
and widths shown on the approved drawings and cross sections or as
otherwise directed.
(1)
Subgrade shall be graded to the elevation and cross section required
with suitable soil or granular material, compacted to the required
density.
(2)
The subgrade shall be properly prepared to receive the subbase or
base material. The subgrade must be approved the morning of the day
stone subbase or stone base course is to be placed.
(3)
Subgrade stability verification. After the subgrade has been prepared
in accordance with the DelDOT Construction Standards, a subgrade stability
verification shall be required prior to placement of the geotextile
separator and crushed aggregate base course material. Density testing
to verify compaction shall be performed in the field as required by
the Town Engineer.
(4)
If approved in writing by the Town, a proof roll test of the prepared
subgrade may be performed in lieu of field density testing. The proof
rolling shall consist of a triaxial dump truck fully loaded to the
maximum allowed weight (a certified delivery slip from the quarry
shall be required to verify the weight). The proof rolling shall be
required to run the entire street subgrade including curblines, over
all trenches and anywhere directed by the Town Engineer or his/her
representative in the field. Areas displaying pronounced elasticity,
movement, pumping, or deformation under the loaded triaxial dump truck
will be considered unstable and will be noted and/or marked. The areas
marked and/or noted showing unstable subgrade shall be corrected and
reverified for the required stability prior to placement of the geotextile
separator and crushed aggregate base course material.
C.
Subbase layer, if required, shall consist of constructing a layer
or layers of aggregate on a prepared area in accordance with the DelDOT
Construction Standards, latest revision.
(1)
If at the time of construction, local unstable subgrade conditions
are encountered, the Town Engineer may require that all areas of unstable
subgrade be excavated to sufficient depth, replaced with approved
material and compacted to a density and stability equal to or greater
than the surrounding subgrade, and/or require the use of an approved
geosynthetic reinforcement material or an approved soil stabilization
technique. Any areas so replaced will be reproof rolled.
(2)
Subbase must be approved on the morning of the day base paving is
proposed, prior to hot mix asphalt release from the plant.
|
Table 1
| ||||
|---|---|---|---|---|
|
Minimum Material Type and Layer Thickness Requirements
For Residential Streets: 1 to 500 Units
| ||||
|
Pavement Layer
|
Good Subgrade Soil
|
Poor Subgrade Soil
| ||
|
1 to 50 units
| ||||
|
Wearing (surface) course (inches)
|
1 1/2
|
1 1/2
| ||
|
Binder course (inches)
|
3
|
2
| ||
|
Bit. conc. base conc. (inches)
|
—
|
3
| ||
|
Aggregate subbase (inches)
|
8
|
8
| ||
|
Structural number
|
2.7
|
3.26
| ||
|
Geotextile separator
|
Yes
|
Yes
| ||
|
51 to 100 units
| ||||
|
Wearing (surface) course (inches)
|
1 1/2
|
1 1/2
| ||
|
Binder course (inches)
|
2
|
2
| ||
|
Bit. conc. base conc. (inches)
|
3
|
3 1/2
| ||
|
Aggregate subbase (inches)
|
6
|
8
| ||
|
Structural number
|
2.93
|
3.42
| ||
|
Geotextile separator
|
Yes
|
Yes
| ||
|
101 to 200 units
| ||||
|
Wearing (surface) course (inches)
|
1 1/2
|
1 1/2
| ||
|
Binder course (inches)
|
2
|
2 1/4
| ||
|
Bit. conc. base conc. (inches)
|
3 1/2
|
4
| ||
|
Aggregate subbase (inches)
|
6
|
8
| ||
|
Structural number
|
3.19
|
3.68
| ||
|
Geotextile separator
|
Yes
|
Yes
| ||
|
201 to 300 units
| ||||
|
Wearing (surface) course (inches)
|
1 1/2
|
1 3/4
| ||
|
Binder course (inches)
|
2
|
2 1/2
| ||
|
Bit. conc. base conc. (inches)
|
3 1/2
|
4
| ||
|
Aggregate subbase (inches)
|
8
|
8
| ||
|
Structural number
|
3.42
|
3.88
| ||
|
Geotextile separator
|
Yes
|
Yes
| ||
|
301 to 500 units
| ||||
|
Wearing (surface) course (inches)
|
1 3/4
|
2
| ||
|
Binder course (inches)
|
2 1/2
|
3
| ||
|
Bit. conc. base conc. (inches)
|
3 1/2
|
4
| ||
|
Aggregate subbase (inches)
|
8
|
9
| ||
|
Structural number
|
3.72
|
4.29
| ||
|
Geotextile separator
|
Yes
|
Yes
| ||
|
Table 2
| |||
|---|---|---|---|
|
Minimum Material Type and Layer Thickness Requirements
For Industrial and Commercial Streets: Up to 50,000 Square Feet Building
Space
| |||
|
Pavement Layer
|
Good Subgrade Soil
|
Poor Subgrade Soil
| |
|
Wearing (surface) course (inches)
|
1 1/2
|
1 1/2
| |
|
Binder course (inches)
|
1 3/4
|
2
| |
|
Bit. conc. base conc. (inches)
|
3
|
3
| |
|
Aggregate subbase (inches)
|
6
|
8
| |
|
Structural number
|
2.93
|
3.26
| |
|
Geotextile separator
|
Yes
|
Yes
| |
D.
Base courses shall consist of one or more layers of materials conforming
to the requirements of one or more of the following sections of DelDOT
Construction Standards, latest revision:
(1)
Base course material shall be crushed aggregate or hot mix asphalt
as required.
(2)
Base course(s) shall be placed in layers as is more fully described
in the DelDOT Construction Standards, latest revision, for each specific
design, or as may be otherwise specified by the Town.
(3)
All subbase(s), if required, shall be properly prepared and primed
as required prior to placement of base course placement according
to the DelDOT Construction Standards, latest revision.
E.
Bituminous pavements shall consist of one or more courses of bituminous
mixture constructed on the prepared foundation in accordance with
the DelDOT Construction Standards, latest revision, and the specific
requirements of the type of pavement as required by the Town and the
Town Engineer.
F.
Prior to application of additional bituminous courses, existing base
courses and binder courses shall be inspected by the Town Engineer
for defects, such as fracture, cracking, or other signs of base failure,
or potential failure. If any street has defects that exceeds the following
maximum levels, the developer shall remove the existing asphalt layers
by rotomilling or other approved method and repair as stated herein
prior to placing the next bituminous course. The developer shall supply
all material, labor and incidentals necessary to perform repair work
at no additional cost to the Town.
(1)
Fatigue (alligator) cracking: Cut out and patch all areas with fatigue
cracking. Replace any five-hundred-foot lane segment that has a fatigue
cracking condition rating exceeding the low severity level for more
than 5% of the pavement surface area in any segment. Removal of existing
pavement shall include all asphalt concrete layers, aggregate layer
and subbase as determined necessary by the Town Engineer and reconstructed
in order to provide a stable base prior to placing the next bituminous
course.
(2)
Rutting: Limit rutting and depressions to no more than one-half-inch
depth as measured with a ten-foot straight edge. Areas exceeding 1/2
inch in depth shall receive a scratch coat prior to the final overlay.
If rutting is deeper than 1 1/2 inches, such rutted areas that
include rutting deeper than 1 1/2 inches shall be cut out and
excavated to such depth as determined necessary by the Town Engineer
and patched in order to provide a stable base prior to placing the
next bituminous course.
(3)
Depressions and utility trenches: requirements shall be the same
as for rutting.
(4)
Potholes: Repair any potholes. Replace any five-hundred-foot lane
segment where the surface area of all potholes totals 5% or more of
the segment's surface area. Removal of existing pavement shall include
all asphalt concrete layers, aggregate layer and subbase as determined
necessary by the Town Engineer and patched in order to provide a stable
base prior to placing the next bituminous course.
(5)
Transverse cracking: Crack seal all transverse cracks exceeding 1/8
inch in width prior to receiving the final overlay. Replace the bituminous
course(s) for any five-hundred-foot lane segment that has a transverse
cracking condition rating exceeding the low severity level with an
average center-to-center spacing of cracks of less than 60 feet in
any segment prior to placing the next bituminous course.
(6)
Check cracking: Cut out and patch all areas with check cracking.
Replace any five-hundred-foot lane segment that has a check cracking
condition rating exceeding the low severity level for more than 5%
of the pavement surface area in any segment. Removal of existing pavement
shall include all asphalt concrete layers, aggregate layer and subbase
as determined necessary by the Town Engineer and reconstructed in
order to provide a stable base prior to placing the next bituminous
course.
G.
The required repair criteria shall be measured based on the Distress
Identification Manual for the Long-Term Pavement Performance Project,
Strategic Highway Research Project, Pub. SHRP-P-338 (most current
edition). A lane segment is defined as any five-hundred-foot lane
section of roadway.
H.
Between October 15 and April 15, perform temporary repairs, such
as, patching of potholes that may be required for safe travel with
approved bituminous stockpile patching material. Remove and replace
temporary repairs with permanent repairs as soon as DelDOT Construction
Standards and weather allow.
A.
Prior to commencing construction, the developer shall notify the
Town Engineer and the Town Administrative Official of the proposed
construction schedule.
B.
Pursuant to notification by the developer, the Town Engineer shall
inspect required improvements during the initial construction phase,
and on a periodic basis thereafter, as may be required to ensure proper
adherence to this chapter.
C.
The Town Engineer shall submit reports to the Town specifying those
items of construction, material and workmanship that do not comply
with the DelDOT Construction Standards or the approved final plan.
D.
The developer, upon notification from the Town, shall proceed at
his own cost to make such corrections as shall be required to comply
with the DelDOT Construction Standards and approved final plans; and
shall notify the Town Engineer and the Town Administrative Official
upon completion to request final inspection.
E.
If such inspection reveals that the repair work is not in accordance
with approved plans and the DelDOT Construction Standards, the Town
Administrative Official may suspend subdivision approval and issue
a cease and desist order that may include any or all of the following
sanctions:
F.
Said cease and desist order shall be terminated by the Town Administrative
Official upon determination by the Town Engineer that said defects
and deviations from plan requirements have been corrected.
G.
No underground pipes, structures, subgrade, subbase or base course
shall be covered until inspected and approved by the Town Engineer.
H.
The developer shall notify the Town Engineer and the Town Administrative
Official, at least 48 hours in advance of completion of any construction
operations requiring an inspection.
I.
The Town Engineer shall make a final inspection with the developer
of all required improvements.
J.
Within 30 days after completion and Town approval of subdivision
or land development improvements as shown on final plans and before
Town acceptance of such improvements, the developer shall submit to
the Town Engineer and the Town Administrative Official as-built plans,
showing actual dimensions and conditions of streets and all other
improvements, certified by a professional engineer to be in accordance
with actual construction. Upon approval by the Town Engineer, the
Town Administrative Official shall present the final plans to the
Town Manager for acceptance.
K.
The Town Administrative Official shall notify the developer of acceptance
of the required improvements if satisfied that the developer has complied
with all specifications and ordinances of the Town.
L.
The developer shall deposit with the Town financial security in an
amount sufficient to cover the construction cost of all improvements
required by the approved final plans prior to start of construction.
(1)
Financial security required herein shall be in the form of a federal-
or state-chartered lending institution's irrevocable letter of credit,
a restrictive or escrow account in such institution or with a financially
responsible bonding company or such other type of financial security
which the Town may, in its reasonable discretion, approve. The bonding
company may be chosen by the party posting the financial security,
provided that said bonding company or lending institution is authorized
to conduct business within the state and stipulates that it will submit
to Delaware jurisdiction and Sussex County venue in the event of legal
action.
(2)
Said financial security shall provide for and secure to the public
the completion of all improvements required by the approved final
plans for which such security is being posted on or before the completion
date fixed in the formal action of approval or development agreement.
(3)
When requested by the developer, the Town Manager shall furnish the
developer with a signed copy of a resolution indicating approval of
the final plan contingent upon the developer obtaining a satisfactory
financial security. The final plan shall not be signed or recorded
until the financial improvements agreement is executed. The resolution
of contingent approval shall expire and be deemed to be revoked if
the financial security agreement is not executed within 90 days, unless
the Town Administrative Official grants a written extension.
(4)
The amount of the financial security shall be equal to 125% of the
cost of completion of all improvements required by the approved final
plans. The amount of the financial security shall be based on an estimate
of the cost of completion of the required improvements, prepared by
a licensed professional engineer, or a contractor's cost estimate
and submitted by the developer for review and approval by the Town
Engineer.
M.
Release from performance guaranty.
(1)
Partial release of performance guaranty. As the work of installing
the required improvements proceeds, the party posting the financial
security may request the Town Manager to release or authorize to be
released, from time to time, such portions of the financial security
necessary for payment to the developer performing the work. Any such
requests shall be in writing, addressed to the Town Manager, and the
Town Manager shall have 45 days from receipt of such request within
which to allow the Town Engineer to certify, in writing, that such
portion of the work upon the improvements has been completed in accordance
with this chapter and the approved plans. Upon such certification,
the Town Manager shall authorize release by the bonding company or
lending institution of an amount as estimated by the Town Engineer
fairly representing the value of the improvements completed. The Town
Engineer, in certifying the completion of work for a partial release,
shall not be bound to the amount requested by the developer but shall
certify to the Town Manager his/her independent evaluation of the
proper amount of partial releases. The Town Manager may, prior to
final release at the time of completion and certification by the Town
Engineer, require retention of 10% of the estimated cost of the aforesaid
improvements.
(2)
Incomplete improvements. If the required improvements are not completely
installed within the period fixed or extended by the Town, the Town
Manager shall declare the financial security in default to collect
the amount payable thereunder. Upon receipt of such amount, the Town
shall install such improvements as were covered by the security and
are commensurate with the extent of building development which has
taken place in the subdivision or land development, not exceeding
in cost, however, the amount collected upon the security.
(3)
Release in full. When all of the necessary and appropriate improvements
have been completed, the developer shall notify the Town Administrative
Official, in writing, by certified or registered mail, of the completion
of the aforesaid improvements and shall send a copy thereof to the
Town Engineer to inspect all of the aforesaid improvements. The Town
Engineer shall, thereupon, file a report, in writing, with the Town
Administrative Official and shall promptly mail a copy of the same
to the developer by certified mail. The report shall be made and mailed
within 30 days after receipt by the Town Engineer or the aforesaid
authorization from the Town Manager. Said report shall be detailed
and shall indicate approval or rejection of said improvements, either
in whole or in part. If said improvements, or any portion thereof,
shall not be approved or shall be rejected by the Town Engineer, said
report shall contain a statement of reasons for such nonapproval or
rejection.
(4)
Notification. The Town Manager shall notify the developer, in writing,
by certified mail, of the action of the Council with regard to approval,
nonapproval or rejection of improvements.
(5)
Rejection of improvements. If any portion of said improvements shall
not be approved or shall be rejected by the Town Council, the developer
shall proceed to complete those improvements, and, upon completion,
the same procedure of notification as outlined herein shall be followed.
(6)
Maintenance of improvements. The developer shall be responsible for
maintenance of all subdivisions or land development improvements until
such improvements are offered for dedication and are accepted by the
Town. In addition, 10% of the performance guaranty shall be held back
by the Town until the developer has posted the maintenance guaranty
and as-built plans are verified and accepted by the Town.
N.
Maintenance guaranty. Where the Town accepts dedication of all or
some of the required improvements following completion, the Town Manager
shall require the posting of financial security to secure the structural
integrity of the improvements and the functioning of the improvements
in accordance with the design and specifications as depicted on the
approved final plan. The security shall be in the form as is authorized
for the deposit of the performance guaranty and shall be for a term
of 18 months from the date of the acceptance of dedication and shall
be in an amount equal to 15% of the actual costs of installation of
the improvements so dedicated.
A.
Traffic control signs shall be required for all commercial and subdivision
entrances and streets. Traffic control signs shall be installed and
maintained by the developer where required. The signs must be included
on the construction plan in accordance with DelDOT requirements and
the MUTCD.
B.
All signs shall conform to federal and state specifications applicable
to size, color, reflectivity, and fabrication.
C.
The developer of a new subdivision or commercial property is required
to purchase, install, and maintain all signs required by the Town.
Once a development street or entrance is accepted for maintenance
by the Town, then the Town shall assume maintenance for all the signs
that were required for acceptance and are located within the right-of-way.
D.
Required signs.
(1)
Street name signs.
(a)
Placement. The locations of street name signs shall be in accordance
with Figure 1.
(b)
Specifications. Street name signs shall be fabricated with four-inch
letters Type III silver reflective sheeting on a background of six-inch
Type II green reflective sheeting mounted on six-and-three-fourths-inch
aluminum sign extrusion, as specified on DelDOT's Standard T-4.
(2)
Regulatory and warning signs.
(a)
Placement. One "Speed Limit XX"/Pictorial "Watch Children" sign
combination shall be installed at each entrance to the development.
Other signs shall be installed in accordance with Town requirements.
(b)
Specifications. All regulatory, warning, and other traffic control
signs shall be fabricated from Type III reflective sheeting on 0.080-inch
(minimum) aluminum sheet and shall conform to MUTCD requirements.
E.
Pavement markings. Pavement markings that are required as part of
an entrance design shall be in accordance with current MUTCD requirements.
Collector streets shall have a center line and edge line stripes.
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Figure 1. Street Name Sign Location
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A.
Requirement. Lighting for streets, parking, open space and recreational
areas shall be required in all subdivisions unless specifically exempted
by the Town. The installation of streetlights, including number, type,
and spacing, shall be as specified by the Town.
B.
Illumination. All public streets, sidewalks, and other common areas
or facilities shall be sufficiently illuminated to ensure the security
of property and the safety of persons utilizing such streets, sidewalks,
and other common areas or facilities.
C.
Design and construction standards.
(1)
Publicly maintained. Lights to be maintained by the Town's electricity
provider shall be constructed and sited in accordance with the standards
of the provider.
(2)
Prevention of glare. Lighting on every lot or parcel shall use an
enclosed lamp design or be indirect from a shielded source in a manner
that prevents glare from beyond the property line.
(3)
Near a residence. Lighting on a lot or parcel within 250 feet of
a residential use may be illuminated only during the hours the entity
is open for public business, unless the applicant demonstrates that
such lighting is located so that it will not have an adverse impact
on the residence.
