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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 Pacific Car Wash Sampled 11-25-02 <br /> of Northern California Reference Number 5269 Received 11-26-02 <br /> 837 Shaw Road Sample Description Water Extracted 11-27-02 <br /> Stockton CA 95215 Sample Prep/Analysis Method EPA 5030/8015, 8020 Analyzed 11-27-02 <br /> Attn Tim Cuellar Lab Numbers 5269-1W, 2W, 3W,4W, 5W Reported 12-06-02 <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 I MW 2 MW 3 MW 4 MW 5 <br /> 192502 112502 112502 112502 112502 <br /> I (ug/L) (ug/L) (ug/L) (ug/L) (ug/L) (ug/L) <br /> MTBE 0 50 350 NO ND NO NO <br /> BENZENE 050 6500 1500 710 ND ND <br /> TOLUENE 050 520 5500 500 NO ND <br /> ETHYLBENZENE 050 680 4100 3000 ND NO <br /> TOTAL XYLENES 050 3000 23000 14000 ND NO <br />' GASOLINE RANGE <br /> HYDROCARBONS 50 35000 100000 52000 ND NO <br />' Report Limit Multiplication Factor 200 200 100 1 1 <br /> I <br /> Surrogate% Recovery FID 103%1 PID 991% FID 116%11'ID 113% FID 114%/PID 108% FID 101%/YID 994% FID 105%1P1D 102% <br />' Instrument ID VAR-GC1 VAR-GC1 VAR-GC1 VAR-GCI 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 (-Z� APPROVED BY01 AL/ <br /> Clan J Cone Ja s hrllrps <br />' bo'atory Director <br />