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Geological Technics I" Page 3 <br /> Groundwater Monitoring Report <br /> Project No 662 2 <br /> May 5,2003 <br /> All water purged from each monitoring well and not used as a sample, was placed in a 55 <br /> p <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 February 13, 2003, were delivered to Sherwood Labs <br /> (Department of Health Services Certification No 1400) of Hilmar, California, for analysis <br /> ' The groundwater samples were analyzed for <br /> • Benzene, Toluene, Ethyl Benzene and Xylene (BTEX) by EPA method 8020 <br /> • Total Petioleum Hydrocarbons as Gasoline (TPH-G) by EPA method 5030/80I5(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 March 5, 2003 (confirmation # 7875481784) <br /> ' 2.0 FINDINGS AND DISCUSSION <br /> The results of the groundwater sample analysis show the following <br /> • MW-1 contained the gasoline oxygenate MTBE at 1400 gg/l The well has contained <br /> other oxygenates in the past but the elevated detected limits probably preclude their <br /> detection for this event <br /> • MW-2, which is upgradient of the former USTs, has not contained contaminant <br /> concentrations above the laboratory detection limits for all thirteen quarterly events <br /> completed thus far in the investigation <br /> • MW-3 contained the gasoline oxygenate MTBE at 4400 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 <br /> • Deep screened well MW-104 contained 29 ug/l MTBE This is the third consecutive <br /> event in which this well has tested positive for MTBE <br />