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<br />shall be demonstrated by observation of the cuttings removed from the trench and the action of the <br />excavating tools on the bedrock surface. <br />3.13 SLURRY ANDBACKFILL <br />Testing requirements for slurry and backfill are as follows (and are outlined in Table 1): <br />A. Materials <br />1. Bentonite: Certification of compliance with the specifications shall be obtained <br />from the material manufacturer. <br />2. Backfill Mix: Backfill material shall be tested prior to placement in the trench by <br />conducting tests to determine slump and gradation. Testing frequency will be as <br />directed by the Engineer with a minimum of one series of tests per 200 cubic yards <br />of backfill material prepared for introduction in the trench. <br />B. Slurry Introduced in the Trench <br />A complete series of tests shall be conducted on slurry from the pond containing slurry ready <br />' for introduction in the trench at least once per shift or each time a pond is prepared. The <br />tests shall include: <br />- pH of the slurry, <br />Unit weight of the slurry, <br />Filtration loss of the slurry, and <br />- Viscosity of the slurry. <br />C. Slurry in the Trench <br />Slurry in the trench shall be tested at least once per shift. Samples shall be obtained from <br />near the bottom of the trench near the point of trenching and tested for unit weight. <br />END OF SECTION <br />t <br />1 <br />07/97 <br />Section 02168 -Page 5 of 5 <br /> <br />