[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:
MDOT Type B
Sieve Designation
Percentage by Weight Passing Square Mesh Sieve
1/2 inch
35%—75%
1/4 inch
25%—60%
No. 40
0%—25%
No. 200
0%—5%
Aggregate for subbase shall contain no particles of rock exceeding four inches in any dimension.
(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:
MDOT Type A
Sieve Designation
Percentage by Weight Passing Square Mesh Sieve
1/2 inch
45%—70%
1/4 inch
30%—55%
No. 40
0%—20%
No. 200
0%—5%
Aggregate for the base shall contain no particles of rock exceeding two inches in any dimension.
(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]
(a) 
Streets.
(1) 
The binder course shall be type B and the finish course shall be type C pavement.
(2) 
Hot bituminous pavement materials and placement for streets shall be in accordance with the MDOT specifications, division 400 (Pavements).
(b) 
Sidewalks. Sidewalks shall be constructed in conformance with the MDOT specifications, section 608.04 (Hot Bituminous Sidewalk). See typical street sections for base and pavement design, figures 1 through 4 in section 98-85.
[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.
Cross sections shall be shown at least at every fifty-foot station.
(4) 
Scale.
a. 
The scale of the plan and profile sheets shall be:
1. 
One inch equals 20 feet or one inch equals 40 feet horizontal; and
2. 
One inch equals two feet, one inch equals four feet, or one inch equals five feet vertical.
A scale of one inch equals 50 feet horizontal may be used with the approval of the City engineer.
b. 
Cross sections shall be drawn with the same vertical scale as the horizontal scale. The following scales are permitted:
1. 
One inch equals two feet.
2. 
One inch equals four feet.
3. 
One inch equals five feet.
A scale of one inch equals 10 feet is not allowed.
c. 
The scale shall be clearly marked on the plan and shall be in written and bar scale form. Sheet size shall be 24 inches by 36 inches, and the grid, if used, shall be 10 squares to the inch.
(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:
1. 
Typical cross section (preferred scale of one inch equals five feet horizontal and vertical).
2. 
Typical underdrain trench section.
3. 
Handicap wheelchair [access] detail.
4. 
Sedimentation and erosion control details.
5. 
Curb type detail.
b. 
Standard detail sheets shall include:
1. 
Erosion and sedimentation details;
2. 
Stormwater control details;
3. 
Catchbasin rim installation details; and
4. 
Any related site improvement details.
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.