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bentonite/bentonite slurry) into a homogeneous mixture as specified. Placement of initial backfill in <br />the trench may require a clamshell bucket. <br />E. Quality Control. The Contractor shall furnish and maintain the following minimum equipment (one <br />half of the amount of each type of equipment is for exclusive use by the Owner/Engineer). The <br />equipment shall be in accordance with applicable API Standard Specifications. All equipment used <br />by the Owner/Engineer shall be returned to the Contractor upon completion of the slurry trench <br />Work. <br />1. Marsh Funnel Sets (2) <br />2. Direct Indicating Viscometer, hand crank (2) <br />3. Standard Filter Presses (4) with the following modifications for hydraulic conductivity tests: <br />A. Regulators and gages which have a range of 1 to 10 psi for application of low pressures. <br />B. A trimming jig to control thickness of bentonite paste to be applied to the inside diameter of <br />the rigid wall test cylinder. <br />C. Porous stone filters and filter papers (adequate supply). <br />D. A 20 cc graduated cylinder with accuracy of 1/2 cc. <br />4. Regulators and gages which have a range of 100 psi +/- which may be adapted to the Standard <br />Filter Press for Slurry Filtrate Loss testing. (2) <br />5. Mud Balances (direct reading of density) (2) <br />6. Sand Content Sets (2) <br />7. Slurry Samplers (2) <br />8. Sets of U.S. Standard Sieves (No. 4, 16, 40, 70, 200 and 3" size) (2) <br />9. Pressure sources and feed lines (2) <br />10. Dry bentonite and Ottawa sand (adequate supply) <br />11. Analytical scales (accuracy: 0.01 grams) (2) <br />12. Drying ovens (2) <br />The Contractor shall also furnish a measuring devise with 0.25-foot incremental markings, or <br />approved equivalent, for determining the depth of trench and sediment accumulations.