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I 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 GeoEnviron mental Inc Client Project ID Cal-Fuels Method EPA 5030/8015M 8020 <br />' of Northern California Reference Number 5400 Instrument ID Var-GC1 <br /> 837 Shaw Road Matrix Soil Extracted 01-27-03 <br /> Stockton, CA 95215 Analyst Clan Cone Analyzed 01-27-03 <br /> Attn Tim Cuellar Reported 02-06-03 <br /> QUALITY CONTROL. DATA REPORT <br /> IANALYTE Gasoline MTBE Benzene Toluene Ethyl Benzene Total Xylenes <br /> ISpike Concentration 220 420 264 159 368 184 <br /> Units mg/kg ug/kg uglkg ug/kg ug/kg ug/kg <br /> LCS Batch# VS-1273 VS-1273 VS-1273 VS-1273 VS-1273 VS-1273 <br /> LCS % Recovery 106% 837% 978% 949% 103% 989% <br /> Surrogate Recovery 105% 102% 102% 102% 102% 102% <br /> Control Limits 70-130% 70-130% 70-130% 70-130% 70-130 % 70-130% <br /> MSIMSD Batch# VS-1273 VS-1273 VS-1273 VS-1273 VS-1273 VS-1273 <br /> I MS% Recovery 892% 762% 955% 884% 985% 9600/3 <br /> Surrogate Recovery 105% 101% 101% 101% 101% 101% <br /> NiSD % Recovery 871% 727% 947% 8900/0 992% 964% <br /> ISurrogate Recovery 106% 102% 102% 102% 102% 102% <br /> Relative%Difference 230% 426% 0876% 0696% 0756% 0406% <br /> Methanol Blank ND ND ND ND ND ND <br /> Surrogate Recovery 113% 113% 113% 113% 113% 113% <br /> Please Note <br /> The LCS(Laboratory Check Sample)is a control sample of known, interferent free matrix that is fortified with representative analytes and <br /> analyzed using the same reagents, preparation and analytical methods employed for the samples The LCS%recovery is used for validation <br /> VI <br /> Sarejectlllple Uatl.{ It JIULLS Due to matr-effects the QC hm,t- ar�d rel.ov er less. fVr IIYISE V1VD J are advisoir only and n not used to n accept vl <br /> batch results <br /> ANALYST APPROVED BY <br /> Clair J Cane Ja Phillips <br /> vrronmental Lab Director <br />