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CASTLE ANALYTICAL LABORATORY <br /> I Environmental Testing Services 2333 Shuttle Drive Atwater, CA 95301 Phone (209)384-2930 <br /> Certificate#1-2480 Fax (209)384-1507 <br /> Advanced GeoEnvironmentai Inc Client Project ID Top Filling Sampled 12-11-01 <br /> of Northern California Reference Number 4275 Received 12-12-01 <br /> 837 Shaw Road Sample Description Water Extracted 12-13-01 <br /> Stockton CA 95215 Sample Prep/Analysis Method EPA 503018015, 8020 Analyzed 12-13-01 <br /> Attn Tim Cuellar Lab Numbers 4275-6W,7W 8W 9W 10W Reported 12-23-01 <br /> I <br />' TOTAL PETROLEUM HYDROCARBONS -GASOLINE <br /> WITH BTEX DISTINCTION <br /> ANALYTE REPORTING LIMIT SAMPLE ID SAMPLE 1D SAMPLE ID SAMPLE 10 SAMPLE ID <br /> MW 6A MW 6B MW 6C MW 6D MW 6E <br />' 121101 121101 121101 121101 121101 <br /> (ug/L) (ug/L) (ug/L) (ug/L) (ug/L) (ug/L) <br /> MTBE 050 18000 330 NO 086 NO <br />' BENZENE 050 16000 13000 190 24 69 <br /> TOLUENE 050 7200 490 290 98 77 <br />'• E7HYL BENZENE 050 1500 1300 140 21 17 <br /> TOTAL XYLENES 050 7300 5200 700 16 62 <br />' GASOLINE RANGE <br /> HYDROCARBONS 50 65000 36000 3500 110 NO <br />' Report Limit Multiplication Factor 500 500 20 1 1 <br /> 1 <br /> 1 <br /> Surrogate%Recovery FID 101%%PID 102% FID 101%/PID 101% FID 115%IPID 1156 FID 113%!PID 1106 FID 110%IPID 109% <br />' Instrument ID VAR-GC1 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 /> aQ6�1� <br /> ANALYST APPROVED BY <br /> Clan J Cone m C Phillips <br />' Laboratory Director <br />