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Oiling

oil, surface, temperature, degrees, inches, water, thoroughly, cent and sediment

OILING.

"Oil shall then be applied as follows: " The area to be oiled shall extend from curb to curb where there are no gutters, and where there are gutters then from gutter to gutter, including all intersections of streets and alleys, and to the property line on both sides of said intersections.

" The roadway shall be coated evenly with the oil at the rate of one gallon to the'square yard of surface covered. It shall then be thoroughly cultivated to a depth of 4 inches until the oil is well mixed with the soil. A second application of oil, at the rate of one gallon to the square yard of surface covered, shall then be made and the area shall be again cultivated to a depth of 4 inches until the oil and soil are well mixed. The street shall then be plowed 4 inches deep with a plow that thoroughly turns over the furrows.

" A third application of oil, to the extent of one gallon per square yard of surface covered, shall then be made, and the entire surface shall be thoroughly cultivated to a depth of 6 inches, a portion of the cultivating being done along diagonal lines so as to thoroughly inix the surface. The road-bed shall then be tamped with the tamping roller until it is solid to within • 3 inches of the finished surface. It shall then be graded with a road grader until it substantially conforms to the official cross-section, and shall then be tamped with the tamping roller until the entire surface is uniformly hard, solid and free from undulations or other irregu larities.

" The completed surface of the street must conform substantially to the established grade and cross section. Should it be low, it shall be broken up to a depth of at least 2 inches, fresh earth and oil supplied and the surface again rolled as before.

" Should an excess of oil remain upon the surface after it has been thoroughly completed, such oily portion shall be plowed to a depth of at least 6 inches and retamped.

" In the process of cultivating, the surface shall be gone over not less than twice after each of the first two applications of oil, and not less than three times after the third application, and in all cases until the oil and soil are thoroughly mixed.

" The total quantity of oil to be applied on the street shall be not less than three (3) gallons net oil measure for every square yard of surface covered.

" At all stages of the work sufficient water shall be applied to secure the best results in the tamping, the amount of water to be used to be governed by the character of the soil, the intention being to make the soil just damp enough to pack solid. • "Any portion of the street that cannot be reached by the roller shall be tamped solid by hand, under the direction of the Board of Public Works.

" The contractor will be held responsible for all damage to curbs, gutters, or cross-walks that may be caused by him in the performance of the work.

OIL.

"The oil used shall be crude petroleum and shall conform to the following requirements: "(a) Specific Gravity: The oil, after being freed from water and sediment, shall be of not less than eleven and five-tenths (11.5) degrees, and not more than fourteen (14) degrees, Baume, gravity, at sixty (60) degrees F.

" The specific gravity shall be determined by the use of ' The Westphal Specific Gravity Balance,' in con junction with the accepted scale hereinafter described for addition and deduction below or above normal temperature.

"(b) Temperature: All oil must be delivered at the point required for sprinkling at a temperature of not less than one hundred (roo) degrees nor more than one hundred and ninety (19o) degrees F.

" (c) Measurement: In determining the quantity of oil delivered, the correction for expansion by heat shall be as follows: From the measured volume of all oil received at any temperature above 60° F., an amount equivalent to 0.4 of one per cent for every to° F. shall be subtracted as the correction for expansion by heat. For the purpose of measuring oil a temperature of 60° F. shall be deemed normal temperature.

" (d) Volatility: The oil shall not contain more than eight (8) per cent of matter volatile when said oil is heated slowly to two hundred and twenty (220) degrees F. and maintained at that temperature during fifteen (is) minutes.

"(e) Asphalt: The oil shall contain not less than sixty (6o) per cent of asphalt, having at a temperature of seventy-seven (77) degrees F. a penetration of eighty (8o) degrees, District of Columbia Standard.

" The percentage of asphalt shall be determined, using oil treated as described in Section (d) in the following manner: A weighed amount of said treated oil shall be heated, in an evaporating oven, to a temperature of four hundred (400) degrees F. until it has reached the proper consistency, when the weight of the residue shall be determined and the per cent calculated.

" (f) Water and Sediment: Deduction will be made for water and sediment in exact proportion to the percentage of such water and sediment found therein, and the oil shall not contain over two (2) per cent of such water and sediment as determined by the gasoline test.

"(g) Tank Wagons: All tank wagons used for deliver ing the oil must first be submitted to the Department of Oil Inspection, which will gauge and stamp into the steel heads of said tanks the capacity in gallons of said tanks, and no figures of capacity will be accepted other than the official rating given by the Department of Oil Inspection.

" (h) All oil to be used shall be tested by the Depart ment of Oil Inspection.