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i P QUARTERLY GROUNDWATER MONITORING REPORT THIRD QUARTER - JULY 1997 Canepa's Car Wash 248 E. Park Street Stockton, California IAugust 12, 1997 I10 INTRODUCTION Condor Earth Technologies, Inc , (Condor) conducted quarterly groundwater monitoring at the Canepa's Car Wash facility located at 248 E Park Street in Stockton, California (Figure 1, Appendix A) on July 21, 1997 The groundwater monitoring was conducted at the request of Mr Remo Canepa, ' facility owner, in response to direction from Mr Ronald Rowe of the San Joaquin County Public Health Services, Environmental Health Division (PHSIEHD) 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 July, 1997, quarterly monitoring A discussion of the current and historical groundwater data is presented in Section 5 0 (Discussion of Results) I2 0 SUMMARY OF RESULTS The following summary describes the data collected during the June, 1997, quarterly monitoring • Groundwater Analvses Gasoline was detected in the groundwater samples from MW- I 1 at 0 30 mg/L, MW-2 at 21 mg/L, MW-3 at 0 88 mg/L, MW-5 at 14 mg/L, MW-6 at 0 10 mg/L, and MW-7 at 0 13 mg/L Gasoline was not detected at or above the laboratory reported detection limits in the sample from MW-4 BTEX constituents were detected in groundwater samples collected from all the monitor wells ranging from 0 3 pg/L to 3,000 gg/L MTBE was detected in groundwater samples from all seven monitor wells using EPA Method 602 However, EPA Method 8260 was used I to attempt confirmation of MTBE in MW-5 EPA Method 8260 indicated that MTBE was not present in the groundwater sample collected from MW-5 at or above the laboratory reported detection limit This result suggests that MTBE may not be ' present in groundwater samples at or above the laboratory reported detection limits collected from the other monitor wells during this and the previous monitoring events Additional analysis with EPA Method 8260 during future monitoring events may ' substantiate the potential absence of MTBE at the site The laboratory results are presented in Section 4 2, Table 1, and Figure 2, Appendix A • Groundwater Elevation The average depth to groundwater was approximately 2 feet below the ground surface at the site The groundwater elevation ranged from ziw ' �� CONDOR