Laserfiche WebLink
1 <br /> PRELIMINARY HYDR0GF_0LOGiC ASSESSMENT REPORT <br /> 5491 'F Street,Banta,California <br /> Delta Project No.40 &481 <br /> Page 3 <br /> r" <br /> The highest benzene and TPPH concentration (0.3 and 450 parts per million (ppm)) was detected in <br /> boring MW-1, 10 feet below grade. <br /> TABLE 1 <br /> Soil Chemistry Results <br /> Depth <br /> Sample ID feet Benzene Toluene Ethvlbenzene Xylenes EDB EDC TPPH <br /> MW-1 5 NF 0.08 NF NF NF NF 3.0 <br /> 10 0.300 4.8 8.5 NF NF NF 450 3 <br /> s NOTES: <br /> All results in parts per million (ppm). <br /> NF = Not Found. <br /> 1.3.2 Nfonitorina Wells <br /> Monitoring well (MW-1) is located immediately north of the underground storage tanks (USTs). The <br /> ` is well is included in Appendix A. The monitoring well was <br /> monitoring well construction diagram for th <br /> k developed by purging with nitrogen gas. <br /> E Ground water samples were collected from monitoring well MW-1, and a domestic well located about <br /> 50 feet west of the property line(Figure 3). The ground water samples were sent to a California certified <br /> laboratory and analyzer] for BTEX, EDC, EDB, and TPPH. Results for the analyses are presented in <br /> Table I Laboratory reports for water analyses are included in Appendix B. Concentrations of petroleum <br /> hydrocarbon constituents (Table 2) were below California maximum contaminant levels for primary <br /> drinking water standards as outlined in Title 22 of the California Code of Regulations. <br /> 1 <br />