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REPORT QUARTERLY GROUNDWATER MONITORING SECOND QUARTER - APRIL 1997 Canepa's Car Wash 6230 Pacific Avenue Stockton, California April 17, 1997 10 INTRODUCTION Condor Earth Technologies, Inc , (Condor) conducted quarterly groundwater monitoring at the Canepa's Car Wash facility located at 6230 Pacific Avenue in Stockton, California (Figure 1, Appendix A) on April I and 2, 1997 The groundwater monitoring was conducted 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/EHD) 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 Iaboratory analyses conducted during the April, 1997, 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 summary describes the data collected during the most recent quarterly monitoring • Groundwater Analyses Gasoline was detected in the groundwater samples from MW- 1 at 6 4 mg/L, MW-2 at 12 mg/L, MW-4 at 0 12 mg/L and SV-9 at 53 mg/L BTEX constituents were detected in groundwater samples from MW-1, MW-2, MW-4 and I SV-9 ranging from 2 9 µg/L to 25,000 µg/L MTBE was detected in groundwater samples from MW-1 at 120 µg/L, MW-2 at 46 µg/L, MW-3 at 13 µg/L, and SV-9 at 79,000 µg/L TPH-G and BTEX constituents were not detected at or above the reported laboratory detection limit in the groundwater samples collected from MW-3, x if11i r w if111 r • 111T - A ♦11T n u Amir .1..i....a....l a 1- I-- 1-1-- iVl W`D, IV]W-D, lVi W-/, w 1Vl VV-0 IV]i IBJ✓ Wd5 11UL UULULAUU d4 Vr dUV1 a Lhe- 1dUVi QLUIy reported detection limit in groundwater samples collected from 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 The depth to groundwater was approximately 40 feet below the ground surface at the site The groundwater elevation ranged from 27 48 to 26 45 feet below sea level (bmsl) The groundwater elevation was approximately 2 2 feet hiuher than the average elevation measured in January, 1997 Groundwater elevation contours are shown in Figure 3, Appendix A I �� CONDOR