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3. Hydraulic conductivity will be measured using a flexible wall permeameter, with <br />and effective confining pressure of 4000 psf in accordance with ASTM D 5084. <br />The soil-bentonite backfill will be placed into the flexible wall permeameter at the <br />slump measured in the field and with no compactive effort applied. <br />The test procedures shall conform to the most recent version of the following test standards: <br />1. Bentonite: API spec 13A <br />2. Bentonite Slurry - Marsh Funnel & Mud Blance: API Code RP 13B <br />3. Betonite Slurry - Filtrate Loss: API Test PP 13B <br />4. Slump: ASTM C 143 <br />5. Unit Weight/Density: ASTM D 6023 <br />6. Grain Size Distribution: ASTM D 422 <br />7. Permeability: ASTM D 5084 <br />C. Sample and Test Location References. All quality control samples and testing shall be referenced <br />to the trench station (or baseline station) and depth at which the sample was obtained or the test <br />was conducted. <br />D. Surveillance of Excavation. The Owner/Engineer will be present, whenever trench excavation is <br />near the design depth of the wall, to visually check and classify soil excavated from the proposed <br />maximum depth of trench excavation. Cuttings from the bottom of the trench shall be examined on <br />a continuous basis to ensure continuity. The Owner/Engineer shall document the soil classification <br />of samples obtained from the bottom of trench. The Contractor shall provide sufficient notice of <br />excavation and allow sufficient time during the excavation cycle for observation and sampling of <br />the soil as it is removed from the trench. <br />E. Trench Depth. The Contractor, in the presence of the Owner/Engineer, shall provide and place a <br />36-inch minimum length wood lath parallel to the trench. Sound or probe the trench with a <br />measuring devise with incremental markings at 0.25-foot increments. The trench depth <br />measurement shall be rounded (up or down from the measurement) to the nearest 0.5 foot, and <br />record the depth every 20 feet along the trench centerline. The Contractor shall measure and <br />record the depth to the bottom of the trench excavation immediately after excavating and <br />immediately before backfilling to document the depth and silt conditions at the bottom of the trench. <br />F. Assistance from Contractor. The Owner/Engineer reserves the right to make reasonable <br />measurements as deemed necessary to inspect and evaluate the as-built condition of the wall. The <br />Contractor shall cooperate with the Owner/Engineer during performance of these measurements, <br />without claims for extras or delays. The Contractor shall provide the Owner/Engineer, at no <br />additional cost, with the following: <br />1. Labor and materials to measure the lines and grades of the temporary working surfaces <br />and the bottom of the trench excavation under the observation of the Owner/Engineer. <br />2. Labor and materials required to collect samples and test samples for quality assurance <br />tests. <br />Equipment Calibration. The test equipment shall be calibrated in accordance with applicable API and ASTM <br />standards.