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• <br /> rQUARTERLY GROUNDWATER MONITORING REPORT <br /> SECOND QUARTER- April 1998 <br /> Canepa's Car Wash <br /> 248 E. Park Street <br /> Stockton, California <br />' May 26,1998 <br />' 1 INTRODUCTION <br /> Condor Earth Technologies, Inc (Condor) conducted quarterly groundwater monitoring on April 24, 1998, at <br /> the Canepa's Car Wash facility located at 248 E Park Street in Stockton, California (Figure 1, Appendix A) <br />' The groundwater monitoring was conducted at the request of Mr Remo Canepa, facility owner, in response to <br /> direction from Mr Ronald Rowe of the San Joaquin County Public Health Services, Environmental Health <br /> Division (PHS/EHD) The groundwater samples were analyzed at a certified laboratory for total petroleum <br />' hydrocarbons, quantified as gasoline (TPH-G), for benzene, toluene, ethyl benzene, and xylene (BTEX), and <br /> for gasoline oxygenates/additives as requested by the PHS/El-LD <br />�. This report includes a description of the field and laboratory procedures conducted during the April 1998, <br /> quarterly monitoring A discussion of the current and historical groundwater data is presented in Section 5 <br /> (Discussion of Results) Recommendations for further site investigation and modifications to the laboratory <br />' analytical procedures for the site are included in Section 6 <br /> 2 SUMMARY OF RESULTS <br /> The following summary describes the data collected during the April 1998, quarterly monitoring <br />' Groundwater_Analysis_ Laboratory analysis of the groundwater sample collected from MW-4 <br /> indicated that BTEX and TPH-G were not detected at or above the laboratory reported detection <br /> limits Laboratory analytical results indicated that TPH-G was detected in the groundwater <br />' samples collected from MW-1 at 0 063 mg/L, MW-2 at 16 mg/L, MW-3 at 0 80 mg/L, MW-5 at <br /> 10 0 mg/L, MW-6 at 0 057 mg/L, and MW-7 at 0 17 mg/L BTEX constituents were detected in <br /> the groundwater samples collected from all of the monitor wells sampled, excluding MW-4, <br />' ranging from 0 46 µg/L (MW-6) to 2,400 µg/L (MW-5) One or more gasoline <br /> oxygenates/additives were not detected at or above the laboratory reported detection limits in any <br /> of the groundwater sample collected from the monitor wells with the exception of MTBE, at <br />' 12 gg/L, in the Sample from MW-6 The laboratory results are presented in Section 4 2 and Figure <br /> 2, Appendix A <br /> 1 <br /> k <br />' tJ CONDOR <br />