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' Geo(ogirnfTecfmws Inc Page 3 <br /> Groundwater Monitonng Report <br /> Project No 662 2 <br /> Julv 27, 2000 <br /> 1.3 Laboratory Analyses <br /> The groundwater samples collected on June 16, 2000 were delivered to Sherwood Lab <br /> ' (Department of Health Services Certification No 1400), of Hilmar, California, for analysis <br /> Sherwood analyzed the three monitoring well groundwater samples for <br /> • Benzene, Toluene, Ethyl Benzene, and Xylene (BTEX) by EPA method 602 <br /> • Total Petroleum Hydrocarbons as Gasoline (TPH-G) by EPA method 5030/8015(M) <br /> ' Additional samples were sent to Kiff Analytical from Sherwood Labs for the analysis sis of y <br /> ' • MTBE, DIRE, ETBE, TAME and TBA by EPA method 8260B <br /> • Methanol and Ethanol by EPA method 8260B <br /> The detection limits for the above analyses are listed in Table 2 of Appendix A while the lab <br /> analytical results are presented in Appendix B <br /> ' 2.0 FINDINGS AND DISCUSSION <br /> The results of the groundwater sample analysis show the following <br /> + The laboratory results indicate that several OFC compounds have impacted the <br /> groundwater in the vicinity of wells MW-1 and MW-3 <br /> ' • MW-2 remained free of detectable contamination for the second consecutive event <br /> • BTEX and TPH-G were not present in any of the groundwater samples <br /> The lateral extent of the contamination is only defined to the northwest by MW-2 The <br /> vertical extent has not been defined <br /> GTI makes the following recommendations <br /> • Continue quarterly groundwater monitoring to complete four consecutive events for <br /> ' determining direction and contaminant trends <br /> • Perform additional soil and groundwater investigation by installing borings and <br /> monitoring wells down gradient of the former UST location <br /> s <br />