All streets shall be paved to the widths as required by § 150-44A.
All trees, stumps, large stones and debris shall be removed from the construction area. The subgrade shall then be prepared by excavating or filling to the approved cross section and profile with all visible roots and large stones removed. These improvements shall be backfilled, puddled and rolled or tamped.
[Amended 1-13-1978]
A. 
Depending on the character of the soils encountered, all or part of the soil base areas where directed by the Engineer shall be improved with added material from the excavation. The contractor shall stockpile, during the excavation process as directed by the Engineer, sufficient selected materials for this purpose. Suitable loamy or sandy soils shall be added and incorporated to form a stable base, a minimum of six inches in compacted thickness. The areas to be treated in cuts shall be excavated to a depth of three inches below subgrade and a layer of suitable material between three and six inches loose measure shall be spread over the roadway area. The added material shall be thoroughly mixed to a depth of six inches by scarifying or by other methods approved by the Engineer. This operation shall continue until the soil is thoroughly mixed. If, in the opinion of the Engineer, soft, yielding or unsuitable material is encountered at subgrade level, it shall be removed to a depth of 18 inches or as directed by the Engineer and backfilled with suitable materials compacted in layers of six inches.
B. 
The soil base shall then be shaped and compacted to the finished line and grade with a roller weighing a minimum of 10 tons. Shaping, filling and rolling shall continue until the soil base is thoroughly compacted to a depth of six inches. When required, water shall be added to the soil mixture to obtain the optimum moisture content for compacting to the maximum density. The prepared finished soil base shall be kept free from ruts and depressions and properly drained. Upon completion of the soil base, the contractor shall request an inspection by the Engineer and shall not proceed with further roadway work until such inspection has been made and the work approved.
[Amended 1-13-1978]
A. 
Description. Upon the stabilized soil base, a drybound dense graded aggregate base course shall be uniformly placed so that, after thorough rolling and compacting, a minimum depth of 4 1/2 inches for residential roads and a minimum depth of six inches for commercial roads is obtained.
B. 
Materials.
(1) 
The base course blend shall consist of well-graded crushed stone. The base course blend shall be the following mechanical gradation:
Screen Size
Percentage Passing
1 1/2 inches
100
1 inche
90 to 100
1/2 inch
65 to 85
3/8 inch
55 to 75
No. 4
40 to 55
No. 8
30 to 45
No. 30
16 to 27
No. 200
0 to 10
(2) 
The amount of material passing the two hundred-mesh screen shall be determined by washing in accordance with ASTM Designation C-117-62T. The portion of the base course blend that is smaller than the No. 40 screen shall have a plasticity Index - 0, according to ASTM design D 424, latest edition. The coarse aggregate shall have a resistance to abrasion by the Los Angeles abrasion test of not more than 20.
(3) 
Of the particles retained on the one-half-inch square sieve, no more than 10% by weight shall consist of flat or elongated pieces. A "flat or elongated piece" is defined herein as one, the greatest dimension of which is more than three times its least dimension.
(4) 
The coarse aggregate, when subjected to five cycles of the soundness test, shall have a weight loss of not more than 5% when sodium sulfate is used or 10% when magnesium sulfate is used. The material shall also achieve a maximum dry density of not less than 145 pounds per cubic foot at optimum moisture content when tested in accordance with ASTM Designation D 1557, latest edition, Method D, except that the sample used shall retain all of the course aggregate sizes.
C. 
Method of construction.
(1) 
The stabilized soil base shall be smooth, parallel to and at the required depth below the dense graded base surface. The soil base shall not be in a muddy or frozen condition. The dense graded base material shall be deposited on the stabilized base by means of a dump truck spreader tailgate or any other approved method of depositing.
(2) 
The spreading of the material shall be by means of approved self-propelled spreader equipment. No segregation of large or fine particles will be allowed, and the material as spread shall be well graded. After the base course has been laid loose, it shall be thoroughly rolled with an approved roller weighing not less than 10 tons. Rolling must begin at the sides and continue toward the center and shall continue until there is no movement of the course ahead of the roller. A pneumatic roller shall be employed at all times as for breakdown rolling.
(3) 
The base course shall be kept in a moist condition to allow compaction to maximum density. Six percent moisture shall be a guideline for the optimum moisture content.
(4) 
In lieu of the above method of finishing rolling, the contractor may, at his option, use a vibratory method as follows: After the material is spread evenly, so that it will have the required thickness after compaction, the entire area shall be compacted by an approved vibratory compactor. Vibration shall continue until the material is keyed sufficiently to permit rolling with an approved roller without displacement of the material. For breakdown rolling, a pneumatic roller must be used.
(5) 
Care shall be exercised to see that the voids in the base course are completely filled, but the operation of vibratory compaction shall not be such as to cause floating of the coarse aggregate.
(6) 
The entire area shall then be rolled with an approved roller weighing not less than 10 tons. Rolling shall begin at the sides and continue toward the center and shall continue until there is no movement of the course ahead of the roller.
D. 
Testing.
(1) 
The thickness of the base course shall be determined by the method directed by the Engineer, and a sieve analysis shall be performed as directed by the Engineer.
(2) 
Upon completion of the aggregate base course, the contractor shall request an inspection by the Engineer and shall not proceed with further roadway work until such inspection has been made and the work approved.
[Amended 1-13-1978]
The asphalt wearing course shall meet the requirements of the New York State Department of Public Works specification Item No. 51 F-Type 1 AF Top (high friction) and shall be a minimum thickness of 1 1/2 inches for residential roadways and a minimum thickness of two inches for commercial roads.