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samples have been collected, the samples will be delivered to the <br /> laboratory along with the accompanying chain-of-custody forms. <br /> Samples of first aquifer formation will be collected for sieve analysis <br /> and permeability testing. Samples of any underlying clay will also be <br /> collected for permeability testing. <br /> �- Approximately 100 samples of the contaminated stockpiled soil will <br /> be collected (2 samples for each 50 yards of the estimated 2500 yards <br /> presently stockpiled) to characterize the soil for purposes of <br /> remediation permitting procedures. These samples will be taken <br /> throughout the length of the pile of contaminated soil at a minimum <br /> depth of 1 foot below the surface. Every 10 samples will be composited <br /> ,r to produce a total of 10 samples for analysis. Each composite sample <br /> will represent a different section of the pile as depicted in Figure 2-1. <br /> Drill cuttings will be segregated and stockpiled along with the <br /> existing stockpiled soil. <br /> All bore holes will be backfilled with a grout mix consisting of sand, <br /> t. cement, bentonite powder, and clean water in the following ratios: <br /> • One 941b sack of Portland cement; <br /> • Two sacks of Lonestar 120 sand; <br /> • 5 lbs of bentonite powder; and <br /> • 4.5 to 6.5 gallons of clean water. <br /> Groundwater elevations will be measured in three of the open bore <br /> holes in relation to a permanent on-site reference point. If bore holes <br /> do not remain open, then water levels will be taken in three of the <br /> hydropunch locations through the hydropunch probe. Water levels <br /> will be determined using the wetted tape method. All water levels <br /> will be measured at the same time 24 hours after boring installation. <br /> The water elevations will be used to determine the groundwater <br /> gradient and direction of flow. <br /> oe <br /> 2-4 <br />