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trench and by direct measurement of trench depth by the Slurry Trench Specialist and Quality Control <br />Representative. <br />3.14 SLURRY AND BACKFILL <br />Testing requirements for slurry and backfill are as follows: <br />A. Bentonite: <br />Certification of compliance with the specifications shall be obtained from the material manufacturer. <br />B. Slurry Introduced in the Trench <br />A complete series of tests shall be conducted on slurry introduced in the trench at least once per shift. <br />These tests shall include: <br />- Unit weight of the slurry by Mud Balance (API Standard 13B-1) <br />- Filtration loss of the slurry (refer to API Standard 13B-1) <br />- Viscosity of the slurry (refer to API Standard 13B-1) <br />C. Slurry in the Trench <br />Slurry in the trench shall be tested at least once per shift. Samples shall be obtained from near the <br />bottom of the trench near the point of trenching and tested for unit weight, filtrate loss, and viscosity. <br />D. Backfill Mix <br />A complete series of tests shall be conducted on backfill to be placed in the trench. The tests shall <br />include: <br />- Slump (refer to ASTM C-143) <br />- Gradation (refer to ASTM D-422) <br />- Coefficient of permeability (refer to ASTM D-5084) <br />- Moisture content (refer to ASTM D-2216) <br />3.15 DOCUMENTATION <br />Top of key elevations will be compared to working platform elevations and depth of cut elevations to provide <br />additional information on actual key depths. <br />Results of all tests performed in accordance with the specifications will be recorded on forms acceptable to the <br />Contractor, Design Professional and the Owner, and signed by the Quality Control Representative. These <br />forms will be available to the Owner at all times for his inspection. Copies of all forms will be submitted daily <br />to the Owner for his reference. <br />END OF SECTION <br />02/06 Section 02168 -Page 5 of 5 <br />