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_. <br /> - fi• <br /> PRF.MCNARY 14YDROGEOI-OGIC ASSESSMENT REPORT <br /> 5491"F Street,Banta,California <br /> Delta Project No.40-88481 <br /> Page 11 <br /> TABLE 8 <br /> Ground Water Sample Analytical Results <br /> Sample <br /> Location Date Benzene Toluene Ethylbenzene XXVlenes EDB EDC TPPH <br /> MW-1 08-22-88' NF NF NF 0.011 0.0073 NF 0.93 <br /> 05-12-89 0.13 0.03 0.09 0.20 NF NF <0.5 <br /> 06-27-89 0.15 NF 0.072 0.030 0.002 NF 0.60 <br /> MW-2 LI5-12-89 0.0005 NF NF 0.002 NF NF <0.1 <br /> MW-3 05-I2-89 0.0003 NF NF 0.002 NF NF <0.1 <br /> NOTES. <br /> All samples reported in parts per million (ppm). <br /> NF = Not Found. <br /> `Data provided by BTS. <br /> 1f <br /> BTEX concentrations in MW-3 was found to be somewhat higher than the BTEX concentrations detected <br /> in monitoring wells MW-1 and MW-2. During the May 1989 sampling event,surface water was discovered <br /> collecting•inside-the.flush-grade monitoring:well enclosure to a level near,the top:of•the.we11 casing, <br /> Because of;the absence of:a:watertight:cap, the:ground water.sample from:MW-1 may not have been; t <br /> f <br /> representative of formationalground water chemistry' To determine whether the May 12,1989,analytical i <br /> i <br /> results represent the actual hydrocarbon concentrations of the formation water, the well was purged on ! <br /> June 27, 1989, by removing 200 gallons of water. After complete recovery, the well was sampled for <br /> analysis. As seen in Table 8, the similarity in the analytical results of May 12, 1989, and June 27, 1989, <br /> for MW-1, suggest they represent the actual BTEX and'IDPH concentrations of ground water at that i <br /> location. Ground water laboratory analytical reports are included in Appendix G <br /> t <br /> F <br /> E � <br /> � h`A <br />