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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 Top Filling Sampled 03-04-03 <br /> of Northern California Reference Number 5521 Received 03-05-03 <br /> 837 Shaw Road Sample Description Water Extracted 03-05-03 <br /> Stockton CA 95215 Sample Prep/Analysis Method EPA 503018015,8020 Analyzed 03-05-03 <br /> Attn Tim Cuellar Lab Numbers 5521-1W,2W,3W, 4W 5W Reported 03-18-03 <br /> TOTAL PETROLEUM HYDROCARBONS -GASOLINE <br /> IWITH BTEX DISTINCTION <br /> ANALYTE REPORTING LIMIT SAMPLE ID SAMPLE ID SAMPLE iD SAMPLE ID SAMPLE ID <br /> MW 1 MW 2 MW 3 MW 4 MW 5 <br /> 030403 030403 030403 030403 030403 <br /> (ug1L) (ug/L) (ug/L) (ug/L) (ug/L) (ug/L) <br /> MTBE 050 ND 12 110 ND ND <br /> BENZENE 050 ND 45 1700 NO 79 <br /> TOLUENE 050 051 056 ND 12 28 <br /> ETHYLBENZENE 050 ND 14 ND ND 150 <br /> • TOTAL XYLENES 050 ND 28 ND ND 58 <br /> GASOLINE RANGE <br /> HYDROCARBONS 50 ND 160 3400 ND 3100 <br /> Report Limit Multiplication Factor 1 1 50 1 5 <br /> Surrogate%Recovery FID 112%1150 112% Flo 113%7PID 111% Fio 111%)PID 109% FID 114%IPID 114% FID 238%IPID 149% <br /> Instrument ID VAR-GC1 VAR-GC1 VAR-GC1 VAR-GCI VAR-GCI <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 (1 <br /> 4A' 6 W <br /> ANALYST APPROVED BY ` <br /> Clan J Cone Jams Phillips <br /> L orafory Director <br />