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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 01-24-03 <br /> ' of Northern California Reference Number 5420 Received 01-28-03 <br /> 837 Shaw Road Sample Description Water Extracted 01-29-03 <br /> Stockton,CA 95215 Sample Prep/Analysis Method I=PA 5030/8015 8020 Analyzed 01-29-03 <br /> Attn Tim Cuellar Lab Numbers 5420-1W,2W, 3W Reported 02-11-03 <br /> TOTAL PETROLEUM HYDROCARBONS -GASOLINE <br /> ' WITH BTEX DISTINCTION <br /> ' ANALYTE REPORTING LIMIT SAMPLE ID SAMPLE ID SAMPLE ID <br /> Influent GAC-2 Effluent <br /> 01-24-03 01-24-03 01-24-03 <br /> ' (ug/L) (ug/L) (ug/L) (ug/L) <br /> MTBE 050 1800 51 NO <br /> BENZINE 050 38 NO NO <br /> TOLUENE 050 36 ND NO <br /> i ETHYLBENZENE 050 NO NO ND <br /> TOTAL XYLENES 050 25 NO NO <br /> ' GASOLINE RANGE <br /> HYDROCARBONS 50 1200 NO ND <br /> Report Limit Multiplication Factor 5 1 1 <br /> Report Limit Multiplication Factor for MTBE only 50 <br /> Surrogate%Recovery FID 101%!PID 979% FID 972%fRD 976% FID 995%/PID 997% <br /> ' Instrument 10 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 /> 6' ANALYST APPROVED BY <br /> Clan J Cone Ja e C Phillips <br /> ' /boratory Director <br />