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QUALITY CONTROL <br />`~ <br />1.1 Objective <br />Geo-Con has developed this Quality Control Plan to define the parameters of Construction <br />Quality Control testing to be competed on the project. Geo-Con, as the slurry wall contractor, <br />is responsible for completing these procedures and tests. <br />1.2 Bentonite Slurry for Trench Excavation <br />Bentonite slurry used for trench excavation will be tested in accordance with the parameters <br />shown in the following table. Test results will be recorded on the daily quality control report. <br />SUBJECT STANDARD TYPE OF TEST MINIMUM SPECIFIED <br /> FREQUENCY VALUE <br />Bentonite API Specification Certificate of 1 per truck load Premium grade <br /> 13A compliance sodium cation <br /> montmorillonite <br />Water pH 1 prior to 6 to 8 <br /> TDS construction < 1000 <br /> Hardness < 250 <br />Bentonite Slurry at API Specification Viscosity 3 per shift 40 seconds <br />the mixer 13B-1 minimum <br /> Filtration 7 per shift <= 25 c.c. in 30 <br /> minutes at 100 psi <br /> Density 2 per shift >= 64 Ib/cf <br /> pH 1 per shift 6.5 to 10 <br />Bentonite Slurry in API Specification Viscosity 2 per shift 40 seconds <br />the trench 136.1 minimum <br /> Density 2 per shift 65 to 85 pcF and at <br /> least 15 pcf lighter <br /> than backfill <br />1.3 Depth and Trench Alignment <br />The depth of the slurry wall will be measured and recorded every ten (10) feet along the cutoff <br />wall centerline with a weighted steel or cloth tape. The depth profile of the open trench and <br />the backfill slopes will be recorded and plotted daily. <br />The trench alignment and offset control points will be surveyed prior to construction activities <br />by others. Survey markers with station locations will be placed at ten (10) feet intervals along <br />the cutoff wall centerline. <br />1.4 Excavated Soils <br />The excavated key material will be inspected to verify that it is consistent with the expected <br />key material. Samples of the key will be collected a minimum of every 50 linear feet and <br />archived. <br />02 - QC Plan <br />~ Geo-Cori <br />