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CASTLE ANALYTICAL LABORATORY <br /> Environmental Testing Services 2333 Shuttle Drive, Atwater, CA 95301 Phone 1209) 384-2930 <br /> Certificate X12079 Fax (209) 384-1507 <br />' Advanced GeoEnvironmental, Inc Client Project ID Pacific Car Wash Sampled See Below <br /> of Northern California Reference Number 1346 Received 11-25-97 <br /> 4005 N Wilson Way Sample Description Soil Extracted 11-26-97 <br /> Stockton, CA 95205 Sample Prep/Analysis Method EPA 5030/8015M, 8020 Analyzed 11-28-97 <br /> Attn Tim Cuellar Lab Numbers 134$-1S, 2S, 3S, 4S, 5S Reported 12-3-97 <br /> TOTAL PETROLEUM HYDROCARBONS - GASOLINE RANGE <br />' WITH BTEX DISTINCTION <br />' ANALYTE REPORTING LIMIT SAMPLE ID SAMPLE ID SAMPLE ID SAMPLE ID SAMPLE ID <br /> MW1-15 MW1 35 MW1-50 MW1-60 MW1-65 <br /> (mg/kg) (mg/kg) (mg/kg) (mg/kg) (mg/kg) (mg/kg) <br />' MTBE 0 010 ND NO NO NO ND <br /> BENZENE 00050 ND NO 6 0 037 0 010 <br />' TOLUENE 00050 NO 46 44 2 0 0 021 <br /> ETHYL BENZENE 00050 ND 24 17 088 ND <br /> TOTAL XYLENES 00050 NO 140 94 5 2 0 022 <br /> GASOLINE RANGE <br />' HYDROCARBONS 1 0 ND 1500 1200 74 ND <br /> Report Limit Multiplication Factor 1 1000 1000 10 1 <br /> 1 <br /> Date Sampled 11-18-97 11-1897 11-18-97 11-18-97 11-19-97 <br /> 1 <br /> Surrogate % Recovery FID 140%1 PID 140% NA NA NA FID So 3%!PID 80 3% <br /> Instrument ID VAR-GC1 VAR-GC1 VAR-GC1 VAR-GC1 VAR-GC1 <br /> Analytes reported as NO 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 /> —6L <br /> Clary J Cone 0fries C Phillips <br /> er4nvironmenral Lab Director <br /> 1 <br />