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I <br />' Quarteriv Monitoring Report April 1999 <br /> Canepa s Car wash(Park Street) <br /> May 31 1999 <br /> Page 5 <br /> concern were detected in the groundwater sample collected from monitor well MW-4 TPH-G and all BTEX <br />' constituents were detected in the samples collected from MW-2 and MW-5 Low concentrations of toluene and <br /> TPH-G were detected in the groundwater sample collected from MW-I Low concentrations of toluene, ethyl <br /> benzene, and TPH-G were detected in the groundwater sample collected from MW-3 A low concentration of <br /> toluene was detected in the groundwater sample collected from MW-6 TPH-G was not detected at or above <br />' the laboratory reported detection limit in this sample Low concentrations of benzene, toluene, and TPH-G <br /> were detected in the groundwater sample collected from MW-7 Additionally, MTBE was detected in the <br /> groundwater samples collected from MW-3 and MW-6 DIPE was detected for the second time in the <br />' groundwater sample collected from MW-5 <br /> The second quarter, 1999, laboratory analytical results indicate that the area of groundwater contamination <br />' most impacted by petroleum hydrocarbons is in the northern portion of the site in the vicinity of monitor wells <br /> MW-2 and MW-5 <br /> 6 RECOMMENDATIONS <br /> Condor recommends that additional investigation be conducted to further chaiacterize the extent of <br />' contamination at the site, including the installation and sampling of additional monitor wells The existing <br /> monitor wells at the site are screened well below the current groundwater table and do not provide sufficient <br /> information pertaining to the vadose zone/groundwater interface These wells should be replaced with well <br /> screens that intercept the groundwater table A work plan describing the recommended installation of four <br /> additional monitor wells (MW-8 through MW-11) has been prepared and is currently pending approval by the <br /> PHS/EI-1D Please callus at (209)234-0518 with any questions <br /> Respectfully submitted � t�� U1 �' ®C <br />' CONDOR EARTH TECHNOLOGIES, INC .��� OG,�� <br /> DONALD F XRESSE <br /> R David Meade Donald F Kresse NO.6430 <br /> Project Geologist California Registered ��' N <br /> Geologist 46430 eo CAL�0 <br /> I <br /> Cmiepa 1 PARKOW-199 doe <br /> f <br /> V-011o" <br /> I �� CONDOR <br />