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yI� <br /> CNVIRONMENTAL HEALTH DN JN <br /> M 304 E . Weber Ave. Third Floor <br /> P. O. Box 388, Stockton CA 95201 -0388 <br /> Approved ❑ <br /> Denied ❑ nn <br /> Conditions 726E NMn1 &A3 6L <br /> UAR DWATER MONITORING REPORT <br /> Date_ _by Turn QUARTER - JULY 1998 <br /> I> l ( WeW5 D2ph//AJ/ Wee 5U?&N <br /> N Mope fRA71) 151. Oo��ti se412 <br /> epa's Car Wash <br /> hriuL � 248 E. Park Street <br /> Stockton, California <br /> 1'-D INStpV .. (yog 5ta� kVJC August 24, 1998 <br /> L11� ft111h/ f9t W eU� `2 Pj y <br /> 1 , MMODUCTION od&OWL 15 , <br /> Condor Earth Technologies, Inc. (Condor) conducted quarterly groundwater monitoring on July 23, 1998, at the <br /> Canepa's Car Wash facility located at 248 E. Park Street in Stockton, California (Figure t , Appendix A). The <br /> 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, Enviromnental 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 total xylenes (BTEX), <br /> and for gasoline oxygenates/additives as requested by the PHS/EHD. <br /> This report includes a description of the field and laboratory procedures conducted during the July 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 July, 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- I at 0.09 mg/L, MW-2 at 18 mg/L, MW-3 at 0.8 mg/L, MW-5 at 23 <br /> mg/L, MW-6 at 0.06 mg/L, and MW-7 at 0. 1 mg/L. BTEX constituents were detected in the <br /> groundwater samples collected from all of the monitor wells sampled, excluding MW-4, ranging <br /> from 0.6 µg/L (MW- I and MW-6) to 2,600 µg/L (MW-5). Gasoline oxygenates/additives were not <br /> detected at or above the laboratory reported detection limits in any of the groundwater samples <br /> collected from the monitor wells with the exception of MTBE, at 8.4 µg/L, in the sample from <br /> MW-6. The laboratory results are presented in Section 4.2 and Figure 2, Appendix A. <br /> 1 n <br /> � � CONDOR <br />