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CASTLE ANALYTICAL LABORATORY <br /> Environmental Testing Services 2333 Shuttle Drive,Atwater,CA 95301 Phone (209)384-2930 <br /> ' Certificate#2480 Fax (209)384-1507 <br /> Advanced GeoEnviron mental, Inc Client Project ID Rainwater Car Wash Sampled 05-29-02 <br /> ' of Northern California Reference Number 4727 Received 05-30-02 <br /> 837 Shaw Road Sample Description Water Extracted 05-30-02 <br /> Stockton,CA 95215 Sample Prep/Analysis Method EPA 503018015,8020 Analyzed 05-30-02 <br /> Attn Tim Cuellar Lab Numbers 4727-1W,2W, 3W,4W,5W Reported 06-07-02 <br /> TOTAL PETROLEUM HYDROCARBONS -GASOLINE <br /> ' WITH BTEX DISTINCTION <br /> ' ANALYTE REPORTING LIMIT SAMPLE ID SAMPLE ID SAMPLE fD SAMPLE ID SAMPLE ID <br /> MW 1 MW 2 MW 3 MW 4 MW 5 <br /> 05-29-02 05-29-02 05-29-02 05-29-02 05-29-02 <br /> ' (ug/L) (ug/L) (ug/L) (uglL) (ug/L) (ug/L) <br /> MTBE 050 2300 300000 2500 31 NO <br /> BENZENE 050 NO 4300 NO 44 NO <br /> ' TOLUENE 050 ND 9200 NO ND NO <br /> • ETHYL BENZENE 050 ND 1500 ND 15 NO <br /> ' TOTAL XYLENES 050 NO 6500 NO 18 NO <br /> GASOLINE RANGE <br /> ' HYDROCARBONS 50 850 190000 750 800 NO <br /> Report Limit Multiplication Factor 5 500 5 1 1 <br /> tReport Limit Multiplication Factor for MTBE only 100 50 <br /> 1 <br /> Surrogate%Recovery FID 97,2%1 PID 9a 3% RD 954%1AID 863% FID 196%/FID 107%6 FID 996%iFgD 85.2% RD 926%1PID 161% <br /> ' Instrument ID VAR-GC1 VAR-GC1 VAR-GC1 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 /> i <br /> '1 <br /> ANALYST APPROVED BY <br /> Clan J Cone Ja C Phillips <br /> I' <br /> 6oratory Director <br /> I <br /> � 'I <br />