Bituminous pavement construction requirements are as follows:
A. The mix design shall be submitted to the city engineer for approval prior to beginning construction operations.
B. Two field density tests must be taken for each day's construction by an independent testing laboratory; the test results must be submitted to the city engineer for approval.
C. The sources of material and blending proportions shall not be changed during the progress of the work without written permission from the city engineer.
D. The bituminous base course shall be constructed in a maximum lift thickness of four inches.
E. The bituminous pavement shall be constructed only when the temperature in the shade is above forty degrees' Fahrenheit. In specific cases, the city engineer may order, in writing, waiver of this limitation.
F. The density of each of the finished layers of bituminous construction shall be obtained from specimens furnished by the contractor. Specimens shall be cut by the contractor from the finished layers with a core drill. The diameter of a specimen shall in no case be less than three and seven-eighths inches nor more than four inches. Two specimens shall be taken for each day's run for each layer. The contractor shall remove the specimens at locations designated by and in the presence of the engineer and transport them to the testing laboratory. Extreme care shall be taken to avoid damage to the specimens. The holes caused by the removal of the specimens shall be refilled immediately with bituminous mixture meeting the specifications, compacted and furnished to the satisfaction of the city engineer. The density tests shall be conducted by an independent testing laboratory.
(Ord. 81-10 § 8.1 (D), 1980).