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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 GeoEnvironmental Inc Client Project ID Rainwater Car Wash Sampled 08-16-02 <br /> ' of Northern California Reference Number 4987Received 08-20-02 <br /> Y <br /> 837 Shaw Road Sample Description Water Extracted 08-26-02 <br /> Stockton, CA 95215 Sample Prep/Analysis Method EPA 5030/8015,8020 Analyzed 08-26-02 <br /> Attn Tim Cuellar Lab Numbers 4987-1W,2W, 3W,4W Reported 09-05-02 <br /> 1 <br /> TOTAL PETROLEUM HYDROCARBONS-GASOLINE <br /> WITH BTEX DISTINCTION <br /> ' ANALYTE REPORTING LIMIT SAMPLE ID SAMPLE ID SAMPLE ID SAMPLE ID <br /> MW 1 MW 3 MW 4 MW 5 <br /> 08-16-02 08-16-02 08-16-02 08-16-02 <br /> (ug/L) (ug/L) (ug1L) (ug/L) (ug/L) <br /> MTBE 050 690 1300 29 ND <br /> BENZENE 050 NO NO 92 ND <br /> ' TOLUENE 050 NO NO NO ND <br /> ETHYL BENZENE 050 ND NO 33 ND <br /> ' TOTAL XYLENES 050 ND NO 40 ND <br /> GASOLINE RANGE <br /> HYDROCARBONS 50 190 520 410 NO <br /> ' Report Limit Mulbphcation Factor 1 10 1 1 <br /> Report Limit Multiplication Factor for MTBE only 20 50 <br /> Surrogate%Recovery rlD 943%1 PIP 938'4 FID 91 8%1 PID 915% FID 95.3%l PID 901% FIE)923%/PID 982% <br /> ' Instrument ID 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 /> 1 ' <br /> t o <br /> ANALYST APPROVED BY <br /> Clan J Cone Ja Ph1111ps <br /> aboratory Director <br />