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I <br /> • 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 Geo Env iron mental Inc Client Project ID Top Filling Station Sampled 06-04-03 <br />' of Northern California Reference Number 5793 Received 06-10-03 <br /> 837 Shaw Road Sample Description Water Extracted 06-11-03 <br /> Stockton CA 95215 Sample Prep/Analysis Method EPA 5030/8015 8020 Analyzed 06-11-03 <br /> Attn Tim Cuellar Lab Numbers 5793-11W 12W 13W 14W, 15W Reported 06-18-03 <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-7C MW-71D MW-7E VW-1C VW-2A <br /> 060403 060403 060403 060403 060403 <br />' (ug/L) (ugIL) (ug/L) (ug/L) (ug/L) (ug/L) <br /> MTBE 0 50 ND ND ND ND ND <br /> BENZENE 050 130 160 110 24000 31000 <br /> TOLUENE 050 75 90 82 43000 18000 <br />' ETHYLBENZENE 050 42 55 55 3800 3300 <br /> TOTAL XYLENES 050 17 23 20 17000 14000 <br /> t GASOLINE RANGE <br /> HYDROCARBONS 50 390 510 380 180000 130000 <br />' Report Limit Multiplication Factor 1 1 5 2000 2000 <br /> Report Limit Multiplication Factor for Benzene only 10 10 <br /> Report Limit Multiplication Factor for Toluene only 10 10 <br /> 1 <br /> 1 <br /> Surrogate%Recovery FID 984Af PID 107% FID 107%IPID 109% FID 102%IPID 104% FID 917%1PID 992% RD 101%IPID 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 /> a Ldl <br />' ANALYST ZoLf APPROVED BY 9ZA az:� <br /> Clan J Cone m Phi tips <br /> Laboratory Director <br /> lar <br />