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_ Quarterly Monitoring Report,October,1998 <br /> Canepa's Car Wasb(Park Street) <br /> --November 18,1998 <br /> * _ T Page 5 .. <br /> i were detected in the groundwater sample collected from MW-1. Low concentrations of benzene, toluene, ethyl <br /> benzene, and TPH-G were detected in the groundwater sample collected from MW-6. Low concentrations of T <br /> t. benzene, toluene, and TPH-G were also detected in the groundwater sample collected from MW-7. <br /> {. Additionally, gasoline oxygenates/additives MTBE and DIPE_were detected in the groundwater samples r <br /> collected from MW-6 and MW-5,respectively. <br /> The fourth quarter, 1998, 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 recommends 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 provide sufficient infonnation pertaining to the vadose zone/groundwater interface. These wells should - <br /> be replaced with well screens that intercept the groundwater table. -Condor previously recommended that <br /> analysis for the gasoline'oxygenates/additives;except for MTBE, be omitted for future quarterly monitoring <br /> events due to lack of laboratory analytical detections for four consecutive monitoring events (Quarterly <br /> Groundwater Monitoring-Third Quarter July 1998). However,-due to the detection of DIPE in the groundwater r. <br /> sample collected from MW-5-on October 21, 1998, we recommend continued monitoring for the selected M <br /> gasoline oxygenates/additives. A Work Plan describing the recommended installation of four additional <br /> monitor wells (MW-8 through MW-12) has been prepared and is currently pending approval by Canepa's Car <br /> Wash. Please call us at(209)234A518 with any questions. --- <br /> i <br /> Respectfully submitted, a <br /> CONDOR EARTH TECHNOLOGIES, IN � 0 :. <br /> R. David Me de _ �oHA�Df 14�ESSE nald F. Kresse <br /> Project Geologist _ - Np,640 1 alifornia Registered <br /> ,a <br /> _ (P �P eologist#6430 <br /> OF C�+ <br /> Canepal-PARKQMR498.doc <br /> i� CONDOR <br />