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Cleo(ogrcaf7echnws Inc Page 3 <br /> Groundwater Monitoring Repoit <br /> �I Project No 770 2 <br /> January 30, 2001 <br /> 13 Laboratory Analyses <br /> The groundwater samples collected on December 29, 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 /> • TEPH- Diesel, Kerosene, Dielectric, and Motor Oil by EPA method 3510/8015(M) <br /> Additional samples were sent to CLS Labs, Inc , from Sherwood Labs for the analysis of <br /> • MTBE, DIPE, TAME, ETBE, TBA, EDB and 1,2 DCA utilizing Method 8260 <br /> • Ethanol and methanol utilizing GC-FID <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 /> fie 20 FINDINGS AND DISCUSSION <br /> The results of the groundwater sample analysis indicate the following <br /> Diesel range petroleum hydrocarbons have impacted the groundwater in five of the <br /> seven monitoring wells MW-1, MW-4, MW-5, MW-6 and MW-105 <br /> 1 • Minor BTEX constituents are also present at levels ranging from <0 3 — 5 ug/1 in wells <br /> MW-6 and MW-105 <br /> • Gasoline, kerosene, and motor oil range petroleum hydrocarbons were not present in <br /> ' any of the groundwater samples at concentrations above the laboratory reporting limits <br /> • Gasoline constituents MTBE, TAME, DIPE, ETBE, TBA, 1,2 DCA, EDB and Methanol <br /> were not present in any of the groundwater samples at concentrations above the <br /> laboratory reporting limits <br /> • Ethanol was detected in well MW-5 at 58,000 ug/1 <br /> The lateral extent of the diesel groundwater plume is currently defined to the southeast by <br /> MW-2, and to the northeast by MW-3 The vertical extent of the plume may be defined by <br /> ' MW-105, but further analysis is needed to determine if the contaminants detected are a <br /> drilling artifact Well MW-6, which is located directly down gradient of well MW-5, <br /> indicated lateral attenuation occurs as evidenced by the lower diesel concentrations in well <br /> i MW-6 <br /> . Nate The presence of 58,000 ug/1 Ethanol in well MW-5 is anomalous GTI believes that <br /> the gioundwater samples for MW-5 and MW-105 may have been switched by the field <br />