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ENVIRONMENTAL HEALTH DIVISION 304 E Weber Ave Third Floor P O Box 388, Stockton CA 95201-0388 Approved ❑ • Darned ❑ Conditions_:5r C�� QUA R NDWATER MONITORING REPORT Date -by JA IFT4 QUARTER -JULY 1998 we-U,5 bftA)/We,_2 :5(4%Z'N V �y Mow fftA1 15'. Cow"t-P/M Oon2pa's Car Wash 4.ri(A_ I-h�H 248 E. Park Street Stockton, California 2 P( � 5v6rnrr A Vila-l"61 N I t� lNS�Ru- 4-ne 5� A'flJ� i�k) mduva Wt:L `7 8�� August 24,199$ 1 INTRODUCTION oc -1 jtq. Condor Earth Technologies, Inc (Condor) conducted quarterly groundwater monitoring on July 23, 1998, at the Canepa's Car Wash facility located at 248 E Park Street in Stockton, California (Figure 1, Appendix A) The I 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 (PHS/EI-1D) The groundwater samples were analyzed at a certified laboratory for total petroleum hydrocarbons, quantified as gasoline (Tl'H-G), toi benzene, toluene, ethyl benzene, and total xylenes (13 rEX), and for gasoline oxygenate sladdit ives as requested by the PHS/EHD This report includes a description of the field and laboratory procedures conducted during the July 1998, quarterly monitoring A discussion of the current and historical groundwater data is presented in Section 5 (Discussion of Results) Recommendations for further site investigation and modifications to the laboratory Ianalytical procedures for the site are included in Section 6 2 SUMMARY OF RESULTS The following summary describes the data collected during the July, 1998, quarterly monitoring • Gioundwater Analysis Laboratory analysis of the groundwater sample collected from MW-4 indicated that BTEX and TPH-G were not detected at or above the laboratory reported detection limits Laboratory analytical results indicated that TPH-G was detected in the groundwater I samples collected from MW-1 at 0 09 mg/L, MW-2 at 18 mg/L, MW-3 at 0 8 mg/L, MW-5 at 23 mg/L, MW-6 at 0 06 mg/L, and MW-7 at 0 1 mg/L BTEX constituents were detected in the groundwater samples collected from all of the monitor wells sampled, excluding MW-4, ranging from 0 6 pg/L(MW-1 and MW-6) to 2,600 µg/L (MW-5) Gasoline oxygenates/additives were not detected at or above the laboratory reported detection limits in any of the groundwater samples collected from the monitor wells with the exception of MTBE, at 8 4 µg/L, in the sample from MW-6 The laboratory results are presented in Section 4 2 and figure 2,Appendix A 1 I i k `� CONDOR