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i <br />' Quarterly Monrtormb Repnrt July 1998 <br /> Canepa s Car Wash <br /> 249 E Park St on CA <br /> g <br /> August gust t 24 ]99B <br /> Page 5 <br /> July 1998 MW-5 is generally down-gradient from the former location of the underground storage tanks The <br /> historical groundwater analytical data for the site are presented in Table A, Appendix B <br />' Benzene concentrations detected in MW-2, MW-3, MW-5, and MW-7 exceed the maximum contaminant level <br /> (MCL) of 1 0 µg/L in drinking water (California Code of Regulations, Title 22, Drinking Water Regulatory <br /> Criteria) <br /> TPH-G and BTEX concentrations in, the samples collected from all of the monitor wells except MW-5 have <br /> generally decreased since monitoring began Phis can not necessarily be attributed to natural attenuation, <br /> however, because the water levels have been above, or very near, the top of the well screens in MW-1, MW-2, <br /> and MW-3 since groundwater monitoring commenced in September, 1994, and in MW-4, MW-5, MW-6, and <br /> MW-7 since the May, 1995, monitoring <br /> 6 RECOMMENDATIONS <br />' Condor recommends that additional investigation be conducted to further characterize the extent of <br /> contamination at the site Further characterization should include the installation of additional monitor wells <br /> The existing monitor wells at the site have a screened interval well below the current water table and provide <br />' little information pertaining to the vadose zone/groundwater interface We further recommend that MTBE be <br /> the only gasoline oxygenates/additives analyzed for flus is the fourth consecutive quarterly monitoring event <br /> that no gasoline oxygenates/additives, other than MTBE, were detected at or above the laboratoiy reported <br /> detection limits in the samples from the monitor wells Please call us at(209)234-0518 with any questions <br /> Respectfully submitted,I y� ��ED G�0�0Or <br /> Condor Earth Technologies, Inc C. <br /> DONALD F KRESSE <br /> R David Meade NO 6430 onald F Kresse <br /> Project Geologist �'J, ���' alifornia Registered <br /> I 'yTF p4- Geologist 96430 <br /> OF C11L�F <br /> I <br /> I <br /> Canepal PKQMR199 doc <br /> I <br /> t� CONDOR <br />