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CASTLE ANALYTICAL LABORATORY <br /> Environmental Testing Services 2333 Shuttle Drive,Atwater,CA 95301 Phone (209)3842930 <br />' Certificate#2480 Fax (209)384-1507 <br /> Advanced GeoEnvironmental, Inc Client Project ID Pacific Car Wash Sampled 08-14-02 <br />' of Northern California Reference Number 4974 Received 08-15-02 <br /> 837 Shaw Road Sample Description Water Extracted 08-21-02 <br /> Stockton, CA 95215 Sample Prep/Analysis Method EPA 5030/8015,8020 Analyzed 08-21-02 <br /> Attn Tim Cuellar Lab Numbers 4974-6W 7W,8W, 9W, 10W Reported 08-28-02 <br /> 1 <br /> TOTAL PETROLEUM HYDROCARBONS -GASOLINE <br />' WITH BTEX DISTINCTION <br />' ANALYTE REPORTING LIMIT SAMPLE ID SAMPLE ID SAMPLE ID SAMPLE ID SAMPLE ID <br /> MW 6 MW 7 MW 8 MW 9 MW 10A <br /> 08-14-02 08-14-02 08-14-02 08-14-02 08-14-02 <br />' (ug/L) (ug/L) (ug/L) (ug/L) (ug/L) (ug/L) <br /> MTBE 050 2400 150 ND 15 700 <br /> BENZENE 050 1100 25 ND 27 NO <br />' TOLUENE 050 3100 ND ND 15 ND <br /> ETHYL BENZENE 050 2700 NO ND 14 ND <br /> lie TOTAL XYLENES 050 20000 13 ND 44 ND <br /> GASOLINE RANGE; <br />' HYDROCARBONS 50 94000 480 ND 640 330 <br /> Report Limit Multiplication Factor 200 1 1 1 2 <br />' Report Limit Multiplication Factor for MTBE only 5 20 <br /> f <br /> Surrogate%Recovery FID 105%IPID 102% FIE)96 3%1 No 914% Fro 89 5%1 PIP 915% Fro 193%!PID 127% Fro 971%IND 962% <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 /> ANALYST <br /> .�4 _ APPROVED BY <br /> Clan7 Cane J,Omfeg C Phdhps <br /> aboratory Director <br /> I <br />