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REPORT QUARTERLY GROUNDWATER MONITORING THIRD QUARTER - AUGUST 1996 Canepa's Car Wash 6230 Pacific Avenue Stockton, California ' September 11, 1996 ' 1.0 INTRODUCTION Condor Earth Technologies, Inc , (Condor) performed quarterly groundwater monitoring at the ' Canepa's Car Wash facility located at 6230 Pacific Avenue in Stockton, California (Figure 1, Appendix A) on August 1, 1996 The groundwater monitoring was performed at the request of Mr Remo Canepa, facility owner, in response to a recent communication from Mr Ronald Rowe of the ' San Joaquin County Public Health Services, Environmental Health Division (PHS/El-ID) directing continuation of the quarterly groundwater monitoring The groundwater samples were analyzed at a certified laboratory for total petroleum hydrocarbons, quantified as gasoline (TPH-G), for benzene, ' toluene, ethyl benzene, and xylene (BTEX), and for methyl tertiary butyl ether (MTBE) as requested by the PHS/EHD This report includes a description of the field procedures and laboratory analyses conducted during the August, 1996, quarterly monitoring A discussion of the current and historical groundwater data is presented in Section 5 0 (Discussion of Results) 2 0 SUMMARY OF RESULTS ' The following sumrnary describes the data collected during the most recent quarterly monitoring ' Groundwater Analyses Gasoline was detected in the groundwater samples from MW- 1 at 14 mg/L, MW-2 at 71 mg/L, MW-6 at 0 18 mg/L, and SV-7 at 360 mg/L BTEX constituents were detected in groundwater samples from MW-1, MW-2, MW-6, MW- 7, and SV-7 ranging from 0 9 gg/L to 91,000 µg/l- MTBE was detected in groundwater samples from MW-1 at 480 µg/L, MW-3 at 18 µg/L, and SV-7 at 7,800 µg/L TPH-G was not detected at or above the reported laboratory detection limit in ' the groundwater samples collected from MW-3, MW-4, MW-5, MW-7, or MW-8 ■ BTEX EX constituents were not aetectea at or above the reporie❑ laboratory ue m uon limits in groundwater samples collected from MW-3, MW-4, MW-5, or MW-8 ' MTBE was not detected at or above the laboratory reported detection limit in groundwater samples collected from MW-2, MW-3, MW-4, MW-5, MW-6, MW-7, or MW-8 The laboratory results are presented in Section 4 2, Table 1, and Figure 2 Appendix A • Groundwater Elevation rhe depth to groundwater was approximately 44 feet below ' the ground surface at the site The groundwater eievation ranged from 31 44 to 30 37 feet below sea level (bmsl) Groundwater elevation contours are shown in Figu , Appendix A ' ilk CONDOR