§ 2.07. Same—Construction and materials.

(a)

Clearing and grubbing. Before actual roadway grading is begun for a subdivision, all vegetation, trees, stumps, roots, rubbish and other obstructions shall be removed to a depth of two feet below the existing grade or final grade, whichever is the lowest. The limits of clearing and grubbing shall be considered as the width of the proposed pavement plus ten feet on each side of the pavement. Desirable trees within the limits of clearing and grubbing may be trimmed, protected, and left standing, if so approved by the city.

(b)

Excavation. Excavation, including embankment, shall be performed in compliance with the following:

(1)

The work shall be done in such a manner that the bottom of the excavation and the top of the embankment shall conform to the line, grades and cross sections shown on the approved plans, of uniform density, ready to receive the base or paving course.

(2)

All soft and yielding materials and other portions of the subgrade which will not compact readily shall be removed and replaced with suitable materials. Muck or highly organic soils shall be removed for their full depth, within the limits of clearing and grubbing, and backfilled with a suitable material.

(3)

All areas where embankment is to be placed shall be cleared as elsewhere specified and shall be plowed or loosened to a depth of six inches and then compacted. The embankment shall be constructed in successive layers of not more than six inches in thickness after compaction. Each layer shall be compacted at a moisture content specified in this subsection. Embankment loosened after compaction shall be re-rolled. Sod, muck, or other unsuitable materials shall not be placed in the embankment. Each layer of the embankment shall be compacted to 90 percent of maximum density obtained at optimum moisture.

(4)

The top six inches of the subgrade, in both cuts and fills, shall be compacted to a density of not less than 100 percent of maximum density obtained at optimum moisture unless otherwise specified. Note: The subgrade in a cut section under a stabilized subbase shall have a minimum of 90 percent of maximum compaction.

(5)

The maximum density at optimum moisture called for in this subsection will be determined by AASHTO Method of T-99-49 (Proctor Control Method) Modified.

(6)

After the subgrade has been prepared, as specified, it shall be maintained free from ruts and depressions and other damage and at the proper line, grade and cross section required. The subgrade shall be kept well drained at all times.

(c)

Base courses.

(1)

Soil cement. The soil cement base shall be furnished and installed in accordance with the latest county specifications.

(2)

Surface testing. The finished surface of the base course shall be checked with a templet cut to the required crown, and with a ten-foot straight edge laid parallel to the centerline of the road. All irregularities greater than one-half inch shall be corrected by scarifying and removing or adding base material as may be required, after which the entire area shall be recompacted.

(d)

Prime or seal coat.

(1)

The prime coat material for limerock base shall be RT-2 or RC-1S.

(2)

The surface to be primed shall be clean and dry with the grazed surface removed. The temperature of the prime material shall be between 100 degrees Fahrenheit and 150 degrees Fahrenheit. The exact temperature shall be such as will ensure uniform distribution. The material shall be applied by means of a rubber-tired, mounted pressure distributor. The amount to be applied shall be dependent upon the character of the surface and shall be sufficient to coat the surface thoroughly and uniformly without having any excess to form pools or to flow off the base. The rate of application shall not be less than 0.10 gallon per square yard.

(3)

The prime coat shall be allowed to stand without sanding for a period of 24 hours, unless otherwise approved. A light layer of clean local sand shall be applied prior to opening the primed base to traffic.

(4)

If necessary the base shall be lightly sprinkled with water before the application of the prime.

(e)

Surfaces (pavements and wearing surfaces). The minimum treatment acceptable for asphaltic concrete surface is as follows: The surface course shall consist of a two-inch or more layer of asphaltic concrete, type II, the composition of which shall conform to the specifications of the state department of transportation, except that requirements for the Hubbard Field Stability Test shall not be less than 2,000 pounds. The construction methods to be followed for the installation of this surface shall conform with those set forth by the state department of transportation.

(f)

Concrete curbs; turnouts.

(1)

The concrete curbs shall be either raised or flush as required and shall be constructed of 2,000 psi concrete (28-day test) and six-inch by 18-inch dimensions. Control joints shall be installed at a minimum of ten feet and one-half-inch mastic expansion joints at a maximum of 50 feet if so required by construction procedures. The use of concrete curb and gutter or inclined Miami-type concrete curbs is approved. The use of asphaltic covered inclined curbs will be considered.

(2)

A paved turnout, 20 feet wide at the pavement edge, or a 20-foot-long section of flush or dropped concrete curb shall be installed at each residential driveway. Dropped curbs shall be set one inch below the finish road edge elevation.

(g)

Control by samples and tests.

(1)

The city engineer may require any or all materials to be submitted to tests, the expense of such tests to be borne by the developer. The city engineer may also require certificates of quality or specifications of material being utilized in the work, such as bituminous materials, concrete, limerock, etc. These certificates shall be supplied by the contractor.

(2)

The contractor shall fully cooperate with the city engineer in the taking of any or all samples required and in the making of any tests required or desired.

(3)

For pavements, whether base course or surface, the contractor shall, when required by the city engineer, furnish samples taken from completed work at any point indicated by the city engineer and shall replace the areas with materials and construction to conform to the specifications in this section and to the line and grade required at no cost to the city.

(4)

The city may require any or all of the following inspections of construction:

a.

After clearing, grubbing and rough grading—inspection of alignment and rough grade.

b.

After fine grading and any required subbase or subgrade stabilization—grade check and soil bearing check.

c.

After compaction of subgrade or subbase—thickness and density checks.

d.

Installation of base—surface checks, grade check, thickness check, density check and bearing value check.

e.

Application of prime—condition of surface and rate of application check.

f.

Surface or pavement installation—check of condition of base and prime and type and quantity check on surface and pavement material.

g.

Drainage facilities—will be checked during installation for material, workmanship, alignment, grade, etc.

(5)

The developer or the contractor acting as the developer or agents shall notify the city engineer of any required inspections, as outlined in subsection (4) of this section, at least 48 hours in advance of the required inspection.

(6)

The city shall do any or all inspections, as outlined in subsection (4) of this section, at its election, and the cost for such inspection services shall be borne in full by the developer. The cost of inspection shall be limited to three percent of the construction cost of all improvements.

(Code 1988, § 19-157)