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Project No. E6576.001 Qtional Groundwater Sampling/W. Clover I ►ftl 22 March 1995 <br /> r <br /> k <br /> i <br /> { Contamination From Composite Samples (Table 4) <br /> Sample 2: 22 ppm <br /> Sample 1: 0 ppm <br /> Average: 11 ppm <br /> 1 463,017x11 = 5.09# <br /> 1M <br /> i <br /> Diesel (xylol) 7.17 #/gal: 5.09 = 0.71 gallons (2.84 quarts) <br /> 7.17 <br /> i <br /> Estimated Material Remaining in Pit (Trimmings and Sluff) <br /> 30 cy (50% sandy backfill, 50% native clay) <br /> L <br /> Weight of Sand <br /> 30 x 62.44/cf x 27 cf/yd x 50% x 1.330: 33,612# <br /> Weight of Clay <br /> 30 x 62.4#/cf x 27 cf/yd x 50% x 1.552: 39,222* <br /> j Total Composite Weight: 72,834* <br /> L� <br /> ` Estimated Contamination Remaining: <br /> 72,834x11 = 0.80# <br /> 1M <br /> Diesel = 7.17#/gal, 0.80 = 0.11 gallons (0.44 quarts) <br /> 7.17 <br /> � TABLE 2 - PIT GRAB WATER SAMPLE (ppb) <br /> 0171�q <br /> Diesel Benzene Toluene Ethyl Total <br /> Benzene - Xylenes <br /> { <br /> ND <br /> ND ND ND ND <br /> Detection 50 0.3 0.3 0.3 0.3 <br /> Limit <br /> Analysis 3550/8015 602 602 602 602 <br /> Method <br /> J ND = not detected <br /> TERRASEARCH, INC. Page 9 <br />