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1 <br /> Ge,04 aI Tccwcs Inc, Page 3 <br /> Groundwater Monitoring Report <br /> Project No. 662.2 <br /> March 3I,2003 <br /> All water purged from each monitoring well and not used as a sample, was placed in a 55 <br /> gallon DOT approved container, properly labeled and stored on site until its proper <br /> disposition can be arranged. <br /> Groundwater monitoring field logs are included in Appendix C. <br /> 1.3 Laboratory Analyses <br /> The groundwater samples collected on December 13, 2002, were delivered to Sherwood <br /> Labs (Department of Health Services Certification No. 1400) of Hilmar, California, for <br /> analysis. <br /> The groundwater samples were analyzed for: <br /> • Benzene, Toluene, Ethyl Benzene and Xylene (BTEX) by EPA method 8020 <br /> • Total Petroleum Hydrocarbons as Gasoline (TPH-G) by EPA method 5030/8015(M) <br /> Sherwood forwarded samples to Entech Analytical Labs Inc. (Department of Health <br /> Services Certification No. 2346) of Santa Clara, California, for analysis of: <br /> `� • Oxygenated Fuel Compounds (MTBE, DIPE, ETBE, TAME & TBA) by EPA method <br /> . 8260 <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 /> As required under AB2886, the laboratory data was submitted electronically to GeoTracker <br /> on January 10, 2003 (confirmation# 6201686263), <br /> �I 2.0 FINDINGS AND DISCUSSION <br /> �IThe results of the groundwater sample analysis show the following: <br /> • MW-1 contained the gasoline oxygenate MTBE at 1200 µg/l. The well has contained <br /> other oxygenates in the past but the elevated detected limits probably preclude their <br /> detection for this event. The concentration of MTBE appears to be stable within a range <br /> of values. <br /> e MW-2, which is upgradient of the former USTs, has not contained contaminant <br /> concentrations above the laboratory detection limits for all twelveq Y uarterl events <br /> completed thus far in the investigation. <br /> • MW-3 contained the gasoline oxygenate MTBE at 1100 �tg/l. The well has contained <br /> -, other oxygenates in the past but the.elevated detected limits probably preclude their <br />