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' geologicaI Teckntcs Inc Page 3 Groundwater Monitoring Report Project No 662 2 April 12, 2004 ' All water purged from each monitoring well and not used as a sample, was P m placed a 55 gallon DOT approved container, properly labeled and stored on site until its proper 1 disposition can be arranged Groundwater monitoring field logs are included in Appendix C 1.3 Laboratory Analyses i The groundwater samples collected on February 12, 2004, were delivered to Sherwood Labs (Department of Health Services Certification No 1400) of Hilmar, California, for analysis The groundwater samples were analyzed for • Benzene, Toluene, Ethyl Benzene and Xylene (BTEX) by EPA method 8020 ' • Total Petroleum. Hydrocarbons as Gasoline (TPH-G) by EPA method 5030/8015(M) • Total Petroleum Hydrocarbons as Diesel (TPH-D) by EPA method M8100 ' Sherwood forwarded samples to Entech Analytical Labs (Department of Health Services Certification No 2346) of Santa Clara, California, for analysis of • Oxygenated Fuel Compounds (MTBE, DIPE, ETBE, TAME & TBA) by EPA method 8260 • 1,2 DCA, EDB and ethanol by EPA method 8260 • Methanol by EPA method 8015 • Lead by method 6010 The detection limits for the above analyses are listed in Table 2 of Appendix A while the lab analytical results are presented in Appendix B ' As required under AB2886, the groundwater elevation & laboratory data were submitted electronically to GeoTracker on March 8, 2004 (confirmation # 1121601700 & 7017320811) ' 2.0 FINDINGS AND DISCUSSION The results of the groundwater sample analysis show the following ' • MW-1 contained the gasoline oxygenate MTBE at 920 pg/l This is consistent with past results • MW-2, which is upgradient of the former USTs, has not contained contaminant ' concentrations above the laboratory detection limits for all quarterly events completed thus far in the investigation