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1.5 Soil-Bentonite Backfill <br />The soil-bentonite backfill will be tested for its properties according to the table below. <br /> <br />TYPE OF TEST STANDARD MINIMUM SPECIFIED VALUE <br /> FREQUENCY <br />Density API Specification 136-1 1 per shift At least 15 pcf higher than <br />the slurry in the trench <br />Slump ASTM C143 3 per shift 3 to 6 inches <br />Geo-Con will sound the backfill slope at the beginning and end of each shift, and at additional <br />times if necessary. Measurements will be taken at 10 or 20-foot intervals to clearly define the <br />slope and the toe. The backfill profile will be recorded and reported on the daily QC report. <br />1.6 Laboratory Quality Control Testing <br />Geo-Con will collect samples of the soil-bentonite backfill at least once per day. A bag of <br />material will be collected at random times by taking some of the backfill at the point where it is <br />being placed. These samples will then be tested or archived. If freezer bags do not maintain <br />in-situ moisture content, other methods will be implemented. <br />An independent testing laboratory will conduct permeability and grain size analysis testing of <br />soil-bentonite samples. The test results will be submitted upon our receipt from the lab. The <br />lab tests wilt be conducted based on the following table. <br />TYPE OF TEST STANDARD MINIMUM SPECIFIED VALUE <br /> FREQUENCY <br />Gradation ASTM D 1140 1 per 400 linear feet 15 to 50% passing No. 200 <br /> sieve <br />Laboratory <br />Permeability ASTM D 5084 1 per 400 linear feet 1x10-~cm/sec or less. <br />1.7 On-site OC Equipment <br />The following equipment will be utilized for on-site quality control testing: <br />1. Mud balance for density testing. <br />2, Slump cone for slump testing. <br />3, Marsh funnel for slurry viscosity measurement. <br />4, Sounding tape or cable for trench depth measurement. <br />5. Filtrate loss cell with nitrogen gas bottle <br />6. Slurry sampling tool <br /> <br />1.8 QC Reporting <br />Geo-Con will submit a daily QC report to the Engineer and/or Owner by Noon of the following <br />workday. The QC report format will be developed prior to mobilization. <br />02 - QC Plan <br />[3 Geo-Cori <br /> <br />