[Ord. No. 472-01 §1, 12-17-2001; Ord. No. 667 §1, 11-7-2011]
A.
All
new streets, curbs, gutters and sidewalks built within the City of
Strafford, Missouri, shall be subject to the specifications set out
in this Article, together with the terms and conditions set forth
on said specifications.
B.
This
Article shall apply to all said street, curb, gutter and sidewalk
improvements made after November 7, 2011.
[1]
Note — There were drawings attached to ord. no. 472-01,
which are as follows: typical street sections; concrete pavement joint
details; parking stall layout elements; concrete driveway detail;
concrete sidewalk detail; concrete street detail; concrete street
repair; asphalt street repair; standard barrier concrete curb and
gutter; concrete pavement joint details; concrete pavement joint location;
curb ramp Type I; curb ramp Type II; mid-street curb ramps; standard
cul-de-sac for local street and cul-de-sac detail. These drawings
are set out in the Attachment to this Chapter.
[Ord. No. 472-01 §1, 12-17-2001; Ord. No. 506 §§1 — 2, 3-3-2003; Ord. No. 667 §1, 11-7-2011]
A.
Specifications
for street construction shall be as follows:
1.
Streets shall be completed in accordance with the plans, profiles,
specifications and cross sections prepared for the subdivider by a
Missouri registered professional engineer and approved by the City
Administrator.
2.
The streets shall be surfaced to a minimum width according to the
type of street as specified in standard street details on file in
the City offices and made a part of this Article by reference.
3.
All work must be done under the supervision of the Strafford Street
Department.
4.
The streets shall be graded, surfaced and improved to the dimensions
required by the cross sections and work shall be performed in the
manner prescribed to by the City Administrator or City Engineer. Streets
shall be surfaced to a minimum width as listed in the table below.
Grading for street improvements shall not create soil slopes exceeding
a vertical rise of one (1) foot for each three (3) feet of horizontal
distance unless retaining walls are to be provided. Street pavement
width shall be measured from back of curb to back of curb.
[Ord. No. 982, 4-17-2023]
|
Street Type
|
Minimum Right-of-Way Width
(in feet)
|
Minimum Pavement Width
(in feet)
|
|---|---|---|
|
Alley/Service
|
20
| |
|
Local
|
50
|
30
|
|
Collector
|
60
|
36
|
|
Arterial
|
80
|
68
|
5.
Prior to the construction of street or alley pavements, adequate
surface and subsurface (if required) drainage facilities shall be
installed by the subdivider. Pipe used for drainage purposes shall
be of corrugated metal, HPDE or reinforced concrete, size and strength
to meet the requirements of the specific conditions which may be encountered.
Minimum diameters of pipe to be used shall be as follows:
|
Inches
| |
|---|---|
|
Roadway cross drains
|
15
|
|
Entrance cross drains
|
15
|
|
Perforated under drains
|
6
|
6.
Declaration from a Missouri registered professional engineer in a
manner acceptable to the City Administrator that all construction
is completed in accordance with the specific conditions in the agreement
for improvements and the accepted plan and specifications are required
before a street can be dedicated for public use. When changes from
the accepted plans and specifications become necessary during construction,
written approval from the City Administrator shall be secured prior
to the execution of such changes.
7.
Adequate provision for the maintenance of all street improvements
shall be made by dedication to and acceptance for maintenance by the
City Council.
8.
Typically, street construction shall proceed as follows:
a.
Rolled stone base. Rolled stone base shall consist
of crushed stone (MoDOT Type 1 aggregate base) constructed on a prepared
subgrade to the line, grade, thickness and typical cross section shown
in the standard street details.
This base shall be constructed at the contractor's option of
two (2) layers of compacted thickness totaling six (6) inches or in
one (1) six (6) inch layer of compacted thickness. The aggregate shall
be produced from limestone obtained from an approved source. The crushed
stone may contain deleterious material, such as shale or disintegrated
stone, not to exceed fifteen percent (15%).
b.
Moisture content. Water necessary for proper compaction
and to prevent segregation may be added at the crushing plant or added
to the crushed stone after it has been delivered to the roadbed. In
either case, the water shall be uniformly mixed with the crushed stone
before compaction is started. The amount of water to be used shall
be sufficient to insure the required density. Excess moisture shall
be avoided.
c.
Spreading, shaping and compacting. In no case will
the contractor be permitted to place the mixture or manipulate it
on muddy or frozen subgrade. Also, any mixture containing frost or
frozen particles shall not be placed on the subgrade or compacted.
After the subgrade has been properly prepared and compacted,
the mixture shall be uniformly spread by blades in successive layers
or courses to such depth that when compacted, the base will have the
minimum thickness shown on the typical cross section. The contractor
may construct the base of any number of layers that he finds most
convenient to facilitate mixing and compacting except that in no case
shall any individual layer have a compacted thickness of more than
six (6) inches. Each layer shall be compacted as hereinafter specified
before any succeeding layer is placed.
Except as otherwise permitted by the City, the first (1st) course
placed upon the subgrade shall be compacted and allowed to become
firm before any subsequent layer is constructed.
If, in the opinion of the City, the mixture becomes too dry
to properly complete compacting operations, water shall be added during
these operations in such an amount as to insure proper compaction.
If, for any reason, the mixture is too wet for proper compaction,
it shall be allowed to dry until proper moisture content has been
obtained.
The mixture shall be handled in such manner as to avoid undue
segregation. If segregation occurs or if the mixture becomes contaminated,
such segregated or contaminated materials shall be removed and replaced
with materials of suitable quality and graduation, except that areas
of surface segregation may be corrected by spreading sufficient limestone
screening to close the voids and bind the loose material firmly in
place. The screening shall be wet and rolled so as to create a dense
and uniform surface. Segregated or contaminated materials, which the
City orders removed, shall be removed and replaced with suitable material
at the sole expense of the contractor.
Shaping and compaction shall be carried on until a true, even,
uniform base course of proper grade, cross section and density is
obtained.
Proper moisture content shall be maintained by wetting the surface
as required during shaping and compacting operations. The uses of
excess water resulting in runoff or in the formation of a slurry on
the surface shall be avoided.
The density to be obtained in the completed base shall be at
least ninety-five percent (95%) of maximum density as determined by
the standard compaction test.
d.
Maintenance. When the base is constructed in more
than one (1) course, the contractor shall maintain the underlying
course or courses by wetting, blading and rolling in a manner satisfactory
to the City until such time as the course is thoroughly cured.
e.
Primer. When base is thoroughly cured throughout
its entire thickness, approved primer is to be applied. Apply with
an approved distributor. No base course shall be primed unless it
has been inspected and approved by the City.
f.
Asphaltic concrete surfacing. Asphaltic concrete
shall meet the requirements of the latest edition of the Missouri
Standard Specifications for Highway Construction published by the
Missouri Department of Transportation (MoDOT) and approved by the
City.
Surfacing shall be laid with an approved spreading and finishing
machine to the line grade and thickness as shown on typical sectional
plans.
Final rolling with smooth-wheeled roller.
No asphalt shall be laid when temperature falls to fifty degrees
Fahrenheit (50°F).
B.
Ditches And Drainage. All ditches providing drainage for
streets constructed as hereinabove set forth shall be sloped and graded
to provide for adequate drainage of reasonably anticipated surface
water runoff, considering the terrain and contour of the land traversed
by said street; contractor shall be responsible for the grading and
seeding of such ditches so as to prevent erosion and to facilitate
mowing and maintenance by the City.
C.
Utility Lines. All street service connections of street-located
utility lines, such as gas, water and sewer, are to be stubbed out
to the adjacent property lines at the expense of the contractor.
D.
Use Of Streets Under Construction. No person shall ride,
drive or lead any horse, mule or other animal or run, push or drive
any vehicle over, on or across any street or part thereof while it
is in the actual course of construction or being improved in such
a manner as to in any way damage, injure or displace any curbing,
guttering, paving, macadamizing, grading or other improvement being
done.
E.
Excavations. No person shall dig or excavate on or under
any street, avenue, alley or sidewalk in this City for any purpose
whatever without having first obtained a permit from the City Clerk.
Every person making or causing to be made any such excavation shall
replace the earth taken therefrom and shall fill such excavation with
the same type of material as surrounding area to the slope, grade
or compaction and shall reseed, when applicable.
F.
Culverts. Only prescribed corrugated metal, HPDE and reinforced
concrete piping which has been approved by the City shall be used.
The use of barrels, hot water heaters or other substitutes for the
prescribed steel, plastic and concrete piping is prohibited.
1.
Culverts must be of sufficient diameter to carry water runoff but
not less than a fifteen (15) inch diameter unless a smaller culvert
is authorized in writing by the Board of Aldermen of the City of Strafford,
Missouri. Culvert must include flared end sections on each end beyond
driveway or street surface.
2.
The installation and maintenance of culverts in a new addition shall
be the responsibility of the developer.
G.
Items Prohibited In Ditch Or Ditch Lines. Dumping of trash,
leaves, ashes or other debris into ditches is prohibited. Driving
or parking of vehicles in or across ditches is prohibited. Burning
of leaves in ditches is prohibited.
H.
Modifications
to the current construction standards to permit "green" development
or "sustainable" development may be permitted on a case-by-case basis
upon review and approval by the City Engineer and the Board of Aldermen.
If approved, the modifications shall be thoroughly documented and
shall become a part of the permanent record of the development so
the effectiveness of the modifications may be monitored.
[Ord. No. 667 §1, 11-7-2011]
The grades of streets shall not exceed the following except
that, where unusual exceptional conditions exist, the Planning and
Zoning Commission may modify these requirements. However, in no case
may streets be constructed with grades that, in the professional opinion
of the City Administrator or City Engineer, create a substantial danger
to the public safety.
Arterial — Five percent (5%) maximum.
Collector Streets — Eight percent (8%) maximum.
Local Streets, Service Drives and Alleys — Ten percent
(10%) maximum.
Pedestrian Ways or Crosswalks — Twelve percent (12%) maximum
unless steps of an acceptable design are to be constructed.
Minimum Grade — In no event shall the minimum grade of
any street be less than one-half of one percent (0.5%).
Length of Vertical Curves — The length of vertical curves
shall be no less than that determined by the formula:
L = KA, where:
L = length of vertical curve
A = algebraic difference in grades
K = determined by the following table
|
Table of "K" Values
| ||
|---|---|---|
|
Crest
|
Sag
| |
|
Arterial
|
80
|
70
|
|
Collector
|
60
|
60
|
|
Local
|
40
|
50
|
|
Alleys
|
10
|
20
|
|
Curvature of Centerline — The radii of curvature on the
centerline shall not be less than the following:
|
|
Highways, thoroughfares, arterials, and secondary arterials
— Six hundred (600) feet.
|
|
Collector Streets — Four hundred (400) feet.
|
|
Local Streets, etc. — Local streets, minor streets and
service drives: one hundred seventy-five (175) feet.
|
[Ord. No. 472-01 §1, 12-17-2001; Ord. No. 667 §1, 11-7-2011]
A.
Curbs
and gutters are required for all streets.
B.
Curbs
and gutters shall be constructed in conjunction with the street pavements
on all streets and shall be of Portland cement concrete at least thirty
(30) inches wide and not less than six (6) inches thick where the
curb abuts the street pavement in accordance with the standard street
details.
C.
Curb
construction for concrete pavements may be integral, standard ninety
degree (90°) curbs.
D.
All
plans for the installation of the curb and gutter shall be approved
by the City Administrator or City Engineer.
[Ord. No. 472-01 §1, 12-17-2001; Ord. No. 667 §1, 11-77-2011; Ord. No. 967, 12-5-2022]
A.
Sidewalks
shall be provided within a subdivision on one (1) side of local and
collector streets and on both sides of arterial streets. Sidewalks
shall be of Portland cement concrete with a minimum thickness of four
(4) inches on a four (4) inch gravel or crushed stone base and a minimum
width of four (4) feet, and the edge of walks shall be adjacent to
the property line.
B.
Crosswalks
within the blocks shall be a four (4) foot walk of Portland cement
concrete four (4) inches thick on a four (4) inch compacted aggregate
base. The base shall be extended beyond the sidewalk on either side
to a distance equal to depth of base.
C.
If
for any reasons sidewalks are not provided, the street grade shall
be completed so that additional grading would not be necessary for
any future provision of sidewalks and a performance guarantee shall
be provided for future installation of sidewalks.
D.
Curb
ramps in accordance with the Standard Street Details and meeting current
ADA requirements shall be provided at all intersections and crosswalks.
E.
Optional
Payment In Lieu Of Sidewalk Construction.
1.
Payments in lieu of sidewalk construction may be sought for a lot that was platted in a manner consistent with Chapter 405, Subdivision Regulations, but has subsequently been determined to not be consistent with Subsection (E)(2) due to unforeseen circumstances at the time of platting. By way of example, these circumstances, may include, but are not necessarily limited to, the emergence of new roadway plans by MoDot, or unforeseen terrain-related issues such as sinkholes where the sidewalk was originally planned. Under these circumstances, the City Administrator may review payments in lieu of sidewalk construction applications in a manner consistent with Subsection (E)(3) of the Section.
2.
Required sidewalks on a specified lot or lots within proposed subdivision under review per Chapter 405, Subdivisions, may also be considered for payments in lieu of sidewalk construction. However, such requests shall be a part of the subdivision platting process in Chapter 405 and must be approved by the Board of Aldermen in a manner consistent with Subsection (E)(3) of the Section.
3.
In considering the payments in lieu of sidewalk construction request,
the City Administrator or Board of Aldermen may take into account,
but not necessarily be limited to, the following review criteria:
a.
Whether the terrain is such that sidewalks are physically infeasible
to be installed;
b.
Whether the sidewalk is, or will likely be, connected to additional
sidewalk facilities on adjoining properties; or
c.
Whether there are plans by the City or the Missouri Department of
Transportation (MoDot) to construct public improvements in the area
which would result in damage or destruction of the proposed sidewalk.
5.
The payment in lieu of sidewalk construction shall be calculated
as a fixed amount per square foot as established by the City.
6.
Payment of the fee in lieu of sidewalk construction must be approved
and payment received before the issuance of a permit for a specific
lot.
7.
The fee in lieu of sidewalk construction shall be held by the City
of Strafford in an account to be used for sidewalk construction only
and shall be used to construct sidewalks in the same City Ward Zone
as the property from where the fee was collected if it is not used
to construct sidewalk adjacent to said property.
8.
Any payment made in lieu sidewalk construction shall only be applicable
to lots identified by the developer at the time of application. It
shall not affect the escrow process for required sidewalks for the
remainder of the subdivision.
