[Ord. No. 777 §26-126, 3-23-1994; Ord.
No. 22-22, 8-18-2022]
A.
The
classifications, extent, width, grade and location of all streets
shall conform to the Comprehensive Plan and major street plan. Where
not shown, the arrangement and design standards of streets shall conform
to the provisions herein.
B.
The
arrangement of streets in new subdivisions shall be coordinated with
existing, proposed and anticipated streets outside of the subdivision.
Provision shall be made for the continuation of existing streets in
adjoining areas.
C.
When
a new subdivision adjoins a tract susceptible to being subdivided,
new streets shall be extended to the boundaries of such tract, to
facilitate extension of the street and traffic circulation.
D.
Streets
shall be related appropriately to the topography and street grades
shall conform as closely as practical to the original topography.
E.
Street
jogs with centerline offsets of less than one hundred fifty (150)
feet shall be prohibited.
F.
Local
streets shall be laid out so as to discourage through traffic.
G.
Permanent
dead-end streets or cul-de-sacs shall be no longer than five hundred
(500) feet, shall provide at the closed end a turnaround having a
radius (measured to the back of curb) of at least forty (40) feet
and shall provide curb elevations as shown on Standard Drawing No.
10. The right-of-way of a cul-de-sac shall have a diameter of one
hundred (100) feet.
H.
Every
lot shall have access to a road that provides reasonable ingress and
egress for emergency vehicles as well as for the intended use of the
lot.
I.
When
a subdivision abuts or contains an arterial street, the Planning and
Zoning Commission may require marginal access streets or other streets
as may be necessary for adequate protection of residential properties
and to provide separation of through and local traffic.
J.
Halfstreets shall be prohibited except where such streets, when combined with a similar street (developed previously or simultaneously) on property adjacent to the subdivision, creates a street that meets the right-of-way and pavement requirements of Section 400.460.
K.
The
developer shall reimburse the City for cost of any street signs and
streetlight needed in the development as determined by the City.
L.
Street
Trees. Subdivisions with more than ten (10) lots in all phases shall
design and present a plan and design for planting street trees in
the subdivision, including accommodating planting zones outside of
utility easements and sidewalks.
[Ord. No. 777 §26-127, 3-23-1994]
Clearing and grubbing shall be performed within the right-of-way
and easement limits shown on the plans. All timber, brush, roots,
stumps, trees or other vegetation cut during the clearing operations
shall become the contractor's responsibility to dispose of and shall
be either removed from the project site or satisfactorily disposed
of on site.
[Ord. No. 777 §26-128, 3-23-1994]
A.
Streets
shall be graded in accordance with the lines and grades on plans approved
by the City. Before placing curb and gutter or base on a graded subgrade,
the subgrade shall be compacted to ninety-five percent (95%) Proctor
for a depth of four (4) inches in accordance with MO-DOT 209 and Standard
Drawing No 5.
B.
Independent
lab testing for compaction of a subgrade shall be provided to the
City at the developer's expense. Proof-rolling with a tandem axle,
fully loaded dump truck may be required at the direction of the City
Engineer or City Public Works Director. Areas found to be soft or
composed of unsuitable material, whether in subgrade or below subgrade,
must be removed and recompacted with suitable materials. All embankments
or fills shall be made in one (1) foot lifts with suitable material.
The fill shall be rolled with a sheepsfoot roller after each lift,
followed by a smooth-faced roller, each weighing a minimum of eight
(8) tons.
[Ord. No. 777 §26-129, 3-23-1994]
A.
Base
rock course for streets shall be four (4) inches thick, unless otherwise
directed by the City Engineer. The base rock course shall be compacted
to ninety-five percent (95%) and shall consist of crushed stone MO-DOT
304 Type 1 and shall be utilized in conformance with Standard Drawing
No. 5. Premoistened or plugged base course shall be preferred.
B.
Independent
lab testing for compaction and thickness of the base course shall
be provided to the City at the developer's expense. Proof-rolling
with a tandem axle, fully loaded dump truck shall be required on the
base course. Areas found to be soft or composed of unsuitable material,
whether in base course or below the base, must be removed and recompacted
with suitable materials.
[Ord. No. 777 §26-130, 3-23-1994]
A total of five (5) inches of asphalt base shall be provided
in two (2) separate lifts of three (3) inches and two (2) inches in
conformance with MO-DOT Section 301. An additional two (2) inch asphalt
surface wear course shall be provided in conformance with MO-DOT Section
401-BP2. The base asphalt courses and asphalt surface course shall
be compacted to ninety-five percent (95%) and shall be utilized in
conformance with Standard Drawing No. 5. Independent testing for asphalt
density/compaction and asphalt extractions shall be provided to the
City at the developer's expense. Independent coring for asphalt thickness
of the asphalt base and asphalt wear surface may be required by the
City at the developer's expense.
[Ord. No. 777 §26-131, 3-23-1994]
Where soils are unusually unstable, it may be required for the
developer to have soil tests run and a pavement design made by a qualified
soils engineer.
[Ord. No. 777 §26-132, 3-23-1994]
A.
All
streets shall be constructed with concrete curb and gutters in conformance
with Standard Drawing No. 5. The concrete forms shall be metal, free
of marks or kinks and shall be rigidly held in position. The use if
a slipline curbing machine is preferred. Expansion and control joints
shall be provided as noted on Standard Drawing No. 5.
B.
Stormwater
curb inlets and boxes shall be constructed in conformance with Standard
Drawing No. 15.
[Ord. No. 777 §26-133, 3-23-1994]
Cut and fill slopes on any street right-of-way may not exceed
2:1.
[Ord. No. 777 §26-134, 3-23-1994]
A.
The
minimum grade on a finished public street shall be one-half percent
(0.5%). The maximum grade on a street shall not be greater than six
percent (6%) unless no other practical alternative is available. However,
in no case may streets be constructed with grades that create a substantial
danger to the public safety.
B.
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 of "K" Values:
|
Street
|
Crest
|
Sag
| |
|---|---|---|---|
|
Secondary arterial
|
80
|
70
| |
|
Collector non-residential
|
60
|
60
| |
|
Collector residential
|
40
|
50
| |
|
Local non-residential
|
30
|
40
| |
|
Local residential
|
20
|
30
| |
|
Alleys
|
10
|
20
|
[Ord. No. 777 §26-135, 3-23-1994]
A.
Intersections
involving the junction of more than two (2) streets shall be prohibited.
B.
Streets
shall intersect as nearly as possible at right angles and no two (2)
streets shall intersect at less than sixty degrees (60°).
C.
Except
where no other alternative is practical or legally possible, no two
(2) streets may intersect with any other street on the same side at
a distance of less than four hundred (400) feet measured from centerline
to centerline of the intersecting street. When the intersected street
is an arterial, the distance between intersecting streets shall be
at least one thousand (1,000) feet.
D.
Street
curb intersections shall be rounded by a tangential arc with a minimum
radius of twenty-five (25) feet for intersections of two (2) residential
local streets and thirty (30) feet for intersections involving collector
or arterial streets. Where substantial use is anticipated by large
vehicles, such as recreational vehicles or semi-trailers, the curb
radius shall be increased to accommodate the anticipate use.
E.
Design Speed, Sight Distance, Centerline Radius.
|
Local Street
|
Collector and Arterial Street
| ||
|---|---|---|---|
|
Design speed
|
25 mph
|
30 mph
| |
|
Minimum sight distance on vertical curve
|
150 feet
|
200 feet
| |
|
Minimum centerline radius
|
150 feet
|
200 feet
|
[Ord. No. 777 §26-136, 3-23-1994]
A.
At
no-stop intersections, the intersection shall be constructed so that
a person standing at a location on the centerline of any street ninety
(90) feet from the intersection of the street centerlines has an unobstructed
view to a point located on the centerline of the intersecting street
ninety (90) feet (in either direction) from the intersection of the
street centerlines. See Standard Drawing No 1.
B.
At
stop intersections, the intersection shall be constructed so that
a person standing ten (10) feet back of the intersection of right-of-way
lines on the stop street has an unobstructed view to a point on the
right-of-way line of the intersecting through street located seventy
(70) feet from the intersection of the right-of-way lines. See Standard
Drawing No. 2.
[Ord. No. 777 §26-137, 3-23-1994]
At street intersections, the intersections of the paved surfaces
shall be rounded with a minimum radius as shown in Standard Drawing
No. 4. Where streets intersect at less than right angles, a greater
radius may be required.
[Ord. No. 777 §26-138, 3-23-1994]
A.
All
driveway entrances and other openings onto streets within the City's
planning jurisdiction shall be constructed so that:
B.
A
driveway entrance shall be constructed to keep stormwater from entering
the driveway from the street and running into garages and shall conform
to Standard Drawing No. 6.
[Ord. No. 777 §26-139, 3-23-1994; Ord.
No. 22-23, 8-18-2022]
A.
Sidewalks
shall be at least four (4) inches thick, at least five (5) feet in
width, shall have a base of at least two (2) inches of compacted crushed
stone and shall be constructed with expansion control joints in conformance
with Standard Drawing No. 6.
B.
Whenever
the Board of Aldermen finds that a means of pedestrian access is necessary
from the subdivision to schools, parks, playgrounds or other roads
or facilities and that such access is not conveniently provided by
sidewalks adjacent to the streets, the developer may be required to
reserve an unobstructed easement of at least ten (10) feet in width
to provide such access.
C.
Where
required, wheelchair ramps shall be constructed in accordance with
Standard Drawing No. 9.
[Ord. No. 777 §26-140, 3-23-1994]
All utilities and improvements which are to be installed in
street rights-of-way shall be completed prior to construction of the
street.
[Ord. No. 777 §26-141, 3-23-1994]
A.
The
required inspections for street improvements are:
1.
When construction is started.
2.
After subgrade has been prepared.
3.
When curb construction is started.
4.
After curbs are finished.
5.
After curb backfill is completed.
6.
During black base placement.
7.
When coring and proof-rolling surfaces and when all layers of asphalt
hot mix are being placed.
8.
After all material/trash has been cleared from the street and right-of-way
and all lot pins have been set.
9.
Final inspection for approval.
C.
Core
test will be taken at developer's expense to check for thickness,
at the City's discretion.
D.
Independent
lab testing of new public streets for density/compaction and thickness
of the subgrade (dirt), subbases (crushed stone), asphalt base and
asphalt surfaces are required and shall be provided to the City at
the developer's expense. (Proctor test for dirt and stone compaction
and extraction and Marshall tests for asphalt, mix and density on
each asphalt layer.)
