[Ord. No. 39-1998, ch. 4, 12-1-1998]
The standards and specifications in this article shall apply
to all new street construction within the City. Whenever the state
department of transportation specification is required, it shall mean
the latest revised specification as most recently published. The latest
revision of these specifications is written in metric units (primary
system) with imperial units (secondary system). It is intended that
all plans and documents created for the City utilize imperial units
as the primary system, until such time as metric conversion is convenient.
[Ord. No. 39-1998, § 4.1, 12-1-1998]
(a)
All underground utilities shall be installed in conformance with
the standards and specifications as set forth by the district or company
regulating the utility. Proper horizontal and vertical control for
the installation of the utilities shall be maintained to ensure that
they are installed in conformance with the locations shown on the
plans.
(b)
For new street construction, underground building sewers, water lines, power lines, telephone lines, cable television lines, conduits for utilities, foundation drains or other storm drain line service connections shall be installed to the right-of-way line prior to paving. See figure 5, Location of Utilities, in section 98-85.
[Ord. No. 39-1998, § 4.2, 12-1-1998]
(a)
Before any clearing in the right-of-way is to begin, the clearing
limits are to be plainly marked at fifty foot intervals, or as necessary
to delineate such limits.
(b)
Before any fill or cut operation is started, the entire right-of-way
shall be cleared of all stumps, roots, brush, and other objectionable
material. All ledges, large boulders, and tree stumps shall be removed
from the right-of-way or as shown on the plans.
[Ord. No. 39-1998, § 4.3, 12-1-1998]
(a)
All organic materials shall be removed to a depth of two feet below
the subgrade of the roadway. Rocks and boulders visible at subgrade
and exceeding six inches in size shall also be removed. Subsoils which
have been identified by the City engineer as not suitable for roadways
shall be removed from the street site to a depth of two feet below
the subgrade and replaced with material meeting the specifications
for gravel aggregate subbase as noted in this article.
(b)
As an alternative, the City engineer may approve the use of a geotextile
fabric which meets the MDOT specifications under sections 620 and
722 (Stabilization Geotextile).
(c)
Except in a ledge cut or for bridge approaches, side back slopes
shall be no steeper than a slope of two feet horizontal to one-foot
vertical, and shall be graded, loamed, limed, fertilized, and seeded
according to the specifications of the erosion and sedimentation control
plan. Where a cut results in an exposed ledge or in cases such as
bridge approaches, a side slope no steeper than four feet vertical
to one-foot horizontal is permitted. There shall be a snow shelf provided
in ledge cut areas with a minimum width of six feet behind the curb.
(d)
The subgrade is to be shaped so as to drain the base. No irregularities
which cause water to be trapped will be allowed.
[Ord. No. 39-1998, § 4.4, 12-1-1998]
(a)
The base course must drain to a ditch or to underdrain. The depth
of the base course on a granular material subgrade may be reduced
to a total of 18 inches, subject to the approval of the City engineer.
The aggregate base course shall be sand or gravel of hard, durable
particles free from vegetative matter, lumps or balls of clay and
other unsuitable substances. The gradation of the part that passes
a three-inch-square mesh sieve shall meet the following grading requirements:
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MDOT Type B
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|---|---|---|
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Sieve Designation
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Percentage by Weight Passing Square Mesh Sieve
| |
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1/2 inch
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35%—75%
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1/4 inch
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25%—60%
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No. 40
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0%—25%
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No. 200
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0%—5%
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Aggregate for subbase shall contain no particles of rock exceeding
four inches in any dimension.
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(b)
The aggregate base course shall be sand or gravel of hard, durable
particles free from vegetative matter, lumps or balls of clay and
other unsuitable substances. The graduation of the part that passes
a three-inch-square mesh sieve shall meet the following grading requirements:
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MDOT Type A
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|---|---|---|
|
Sieve Designation
|
Percentage by Weight Passing Square Mesh Sieve
| |
|
1/2 inch
|
45%—70%
| |
|
1/4 inch
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30%—55%
| |
|
No. 40
|
0%—20%
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|
No. 200
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0%—5%
| |
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Aggregate for the base shall contain no particles of rock exceeding
two inches in any dimension.
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(c)
Copies of the sieve analysis results of the samples of base and subbase
aggregate to be used shall be submitted to the City engineer for review
no later than one week before the placement of any gravel in the street.
(d)
Gravel shall be placed and compacted in accordance with the MDOT
standard specifications, section 304.03 (Placing).
(e)
Compaction tests shall be taken at locations along the road as specified
by the City engineer. All costs associated with the compaction tests
shall be paid by the developer. No pavement shall be placed until
the compaction tests have been reviewed and approved by the City engineer.
[Ord. No. 39-1998, § 4.5, 12-1-1998]
[Ord. No. 39-1998, § 4.6, 12-1-1998]
(a)
Granite curb, bituminous curb, and stone edging (type 1, type 3,
and type 5 respectively) shall conform to the MDOT specifications
for curbing under section 609.
(b)
Islands located within rights-of-way and at the center of the cul-de-sac
shall be curbed with type 5 curbing.
(c)
All intersection radii shall be curbed with type 1 circular vertical
curbing.
[Ord. No. 39-1998, § 4.7, 12-1-1998]
Any culverts installed in the roadway to handle cross drainage
shall be HDPE (high-density polyethylene) pipe such as ADS N-12 or
equal. Minimum cover over pipes shall be 24 inches unless otherwise
approved by City, and the pipe shall be installed on a bed of compacted
gravel a minimum of eight inches in depth. The backfill material for
the pipe shall meet the standards for type B gravel, aggregate base.
Backfill shall be compacted in six-inch lifts to a density of 95%,
modified proctor test. Culverts are to be designed to meet AASHTO
HS20 loading requirements, and to handle the storm requirements of
any governing approval agency. Other agencies may require permits.
[Ord. No. 39-1998, § 4.8, 12-1-1998]
Plans for street construction shall be designed by a registered
professional engineer, currently licensed in the state, who will stamp
all engineering plans submitted to the City. Any plans dealing with
survey work must be stamped by a registered land surveyor, currently
licensed in the state. The developer, or his agent, is solely responsible
for any defect in the development plan which affects any individual
or the general public, and shall hold the City or its agents harmless,
regardless of any acceptance of any plan or portion thereof. The plans
shall contain the following:
(1)
Plan view. The plan view shall be plotted on a twenty-four-inch by
thirty-six-inch sheet size and shall include all of the following:
a.
Centerline with stationing at fifty- and one-hundred-foot stations;
b.
Horizontal control points such as point of curvature, point of tangency,
point of reverse curvature, point of curvature on a curve with stations
and curve data;
c.
Radius points for intersections and culs-de-sac with station and
offset locations;
d.
Proposed street name (requires approval of the City council);
e.
All aboveground utilities (hydrants, power and/or telephone pole
locations);
f.
Catchbasin locations if required;
g.
Curb and sidewalk lines;
h.
Right-of-way and easement lines;
i.
Proposed monuments;
j.
Any proposed entrance locations;
k.
Outstanding physical features (such as brooks, streams, or gullies
affected by the street);
l.
North arrow;
m.
Benchmark locations; and
n.
Descriptions with reference to datum, match lines, lot numbers, and
any other information pertinent to the project.
(2)
Profile. The profile shall include:
a.
Both existing and proposed grade, vertical control points such as
PVC, PVT, and PVI with stations and elevations listed;
b.
Design grades;
c.
Vertical curve lengths;
d.
Fifty- and one-hundred foot stations with existing and proposed grades;
e.
Scale;
f.
Grid line elevations in righthand and lefthand margins;
g.
Catchbasin locations and rim elevations; and
h.
Any other information pertinent to the project.
(3)
Cross sections. Cross sections shall include:
a.
Both existing and proposed grade;
b.
Centerline station and elevation;
c.
Side slopes;
d.
Right-of-way lines;
e.
Scale;
f.
Grid line elevations at right and left of each section; and
g.
Any other information pertinent to the project.
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Cross sections shall be shown at least at every fifty-foot station.
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(4)
(5)
Contours. The detail sheet shall include a separate contour plan
showing existing grades at a contour interval of two feet minimum;
the road layout and centerline stationing shall be shown. The origin
(from what data) of the depicted contours shall be indicated on the
plan.
(6)
Details.
a.
The detail sheets shall include, but not be limited to, the following
information:
c.
Separate intersection details (including culs-de-sac and temporary
turnarounds) shall be shown at a scale of one inch equals 10 feet.
These plans shall detail drainage design for these areas and may require
several spot elevations to clearly explain construction details.
