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� w <br /> �„ <br /> Mr. Kyle Christie <br /> July 18, 1989 <br /> Page 3 <br /> Table 1. Analytical Results of .February 27, 28, and <br /> March 2, 1989, Groundwater Samples <br /> EPA Method 602 <br /> Sample Date Benzene. Ethylbenzene, Toluene, Xylene, <br /> number collected ug/la ug/1 ugh ug/1 <br /> PR-1 05/30/89 ND ND ND ND <br /> BHD-1 05/30/89 2,900 870 120 790 <br /> E-2 05/30/89 638 19.4 10.3 75.3 <br /> E-5 0513l/89 2,430 260 36 1,670 <br /> E-8 05/31/89 132 8.1 5.4 27.3 <br /> E-10 05/31/89 5,520 1,060 5,760 6.900 <br /> E-11 05/31/89 437 97 162 281 <br /> E-12 35/30,189 38.4 1.5 1.9 13.1 <br /> MaSnum contaminant <br /> level 1.0 680 100c 1,750 <br /> Detection <br /> limit 0.5 0.5 0.5 0.5 <br /> aug/1 = micrograms per liter. <br /> bDHS MCLS for Drinking Water, April 1989. <br /> cCalifomia DHS Drinking Water Action Level, April 1989. <br /> Nnte: ND = nondetectable. <br /> Table 2 summarizes the benzene concentrations for spring, summer, fall 1988, winter 1989, <br /> and spring 1989 quarterly sampling events. This table shows that benzene concentrations have <br /> varied in each well over time. <br /> The concentration of ethylbenzene is above the DHS MCL in monitoring wells BHD-1 and <br /> E-10. The concentration of toluene is above the DHS Drinking Water Action Level in <br /> monitoring wells BHD-1,E-10;and E-11. The concentrations of xylene are above DHS MCLS <br /> in monitoring well E-10. <br /> BROWN AND CALDWUL <br /> 7235STFEET SACRAMENTQCAUFORNLAVA$4.7992-(9*14�4-02] <br /> .Y <br />