(A) Sampling and testing. Sampling and testing shall be the responsibility of the contractor. Tests shall be performed by an approved commercial testing laboratory or with approved facilities furnished by the contractor. All results shall be submitted to the town.
(B) Laboratory tests. Laboratory tests for moisture-density relations shall be determined in accordance with ASTM D2216. A minimum of one test shall be performed on each different type of material used for backfill.
(C) Field in-place density tests.
(1) The contractor shall perform a sufficient number of compaction density tests to demonstrate that the required compaction requirements are being met. In general, a minimum of one satisfactory compaction test shall be performed for each cumulative lift length of 400 feet.
(2) Upon failure of a test, the lift shall be compacted again and retested. Additional tests will be required if the first tests consistently fail, if the material changes or if the contractor’s method of compaction changes.
(3) Density tests shall be determined in accordance with ASTM D1556 or ASTM D6938. When ASTM D6938 is used, the calibration curves shall be checked and adjusted using only the sand cone method as per ASTM D1556. Calibration checks of both density and moisture gages shall be made at the beginning of a job and upon each different type of material encountered.
(4) Copies of calibration curves and the results of calibration tests shall be furnished to the town.
(Ord. 2010-3, passed 10-6-2010)