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i <br /> i Quarterly Monttonna Report January 1999 <br /> Canepa s Car Wash(Part.Street) <br /> February 8 1999 <br /> Page 5 <br /> concentrations of benzene, toluene, ethyl benzene, and TPH-G were detected in the groundwater sample <br /> collected from MW-6 Low concentrations of benzene, toluene, and TPH-G were also detected in the <br />' groundwater sample collected from MW-7 Additionally, MTBE was detected in the groundwater samples <br /> collected fionn MW-3 and MW-6 <br />' The first quarter, 1999, laboratory analytical results indicate that the area of groundwater contamination most <br /> impacted by petroleum hydrocarbons is in the northern portion of the site in the vicinity of monitor wells MW- <br /> 2 and MW-5 <br /> 6 RECOMMENDATIONS <br />' Condor tecornmends that additional investigative activities be conducted to further characterize the extent of <br /> contamination at the site Further characterization should include the installation and sampling of additional <br /> monitor wells The existing monitor wells at the site are screened well below the current groundwater table and <br />' do not piovide sufficient information pertaining to the vadose zone/groundwater interface These wells should <br /> be replaced with well screens that intercept the groundwater table A Work Plan describing the recommended <br /> installation of four additional monitor wells (MW-8 through MW-12) has been prepared and is currently <br />' pending approval by the PHS/EHD Please call us at(209) 234-0518 with any questions <br /> Respectfully submitted, <br /> CONDOR EARTH TECHNOLOGIES, INC �� G <br /> OQAIU F,itAESSE <br /> H0.6430 *t` <br /> D'I"R David Mead Donald F Kresse Jim !Z* <br /> Project Geologist California <br /> Regis ered 0F CAL\F��� <br /> 1 <br /> I <br /> CanepaI PAP.I QMR199 doc <br /> 1 <br /> 1 <br />' �� CONDOR <br />