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' CASTLE ANALYTICAL LABORATORY <br /> Environmental Testing Services 2333 Shuttle Drive, Atwater, CA 95301 Phone 1209) 384-2930 <br /> Certificate #2079 Fax (209) 384-1507 <br /> Advanced GeoEnvironmental, Inc Client Project ID Pacific Car Wash Sampled 10-9-98 <br /> of Northern California Reference Number 1796 Received 10-14-98 <br />' 4005 North Wilson Way Sample Description Soil Extracted 10 14-98 <br /> Stockton, CA 95205 Sample Prep/Analysis Method EPA 5030/8015M, 8020 Analyzed 10 16 98 <br /> Attn Tim Cuellar Lab Numbers 1798-6S, 7S Reported 10 22-98 <br />' TOTAL PETROLEUM HYDROCARBONS -GASOLINE <br /> WITH BTEX DISTINCTION <br /> I <br /> ANALYTE REPORTING LIMIT SAMPLE ID SAMPLE ID <br /> MW9-30 MW9-40 <br />' (mg/kg) (mglkg) (mg/kg) <br /> MTBE 0 010 ND ND <br />' BENZENE 00050 NO ND <br /> TOLUENE 00050 ND ND <br /> ETHYL BENZENE 00050 NO ND <br /> TOTAL XYLENES 00050 ND NO <br /> GASOLINE RANGE 1 0 ND NO <br /> HYDROCARBONS <br />' Report Limit Multiplication Factor 1 1 <br /> Surrogate % Recovery FID 60 8%1PSD 61 6% FID 52 0%!PID 52 9% <br /> Instrument 1D VAR GC1 VAR-GC1 <br /> Analytes reported as ND were not detected or below the Practical Quantitation Limit <br /> Practical Quantitation Limit = Reporting Limit x Report Limit Multiplication Factor <br /> ANALYST APPROVED BY <br /> Carr J Cone ame C Phrllrps <br /> Laboratory Director ' <br />