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' CASTLE <br /> • ANALYTICAL LABORATORY <br />' Environmental Testing Services 2333 Shuttle Drive Atwater, CA 95301 Phone (209)384-2930 <br /> Certificate#2079 Fax (209)384-1507 <br /> Advanced GeoEnv:ronmental, Inc Client Project ID Cal Fuels Method EPA 5030/8015M 8020 <br /> of Northern California Reference Number 3172 Instrument ID Var-GC1 <br /> 4005 North Wilson Way Matrix Sod Prepared 8-24-00 <br /> Stockton CA 95205 Analyst Clan Cone Analyzed 8-25-00 <br /> Attn Tim Cuellar Reported 9-7-00 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Gasoline MTBE Benzene Toluene Ethyl Benzene Total Xylenes <br /> Spike Concentration 220 421 301 150 365 179 <br /> Units mglkg ug/kg ug/kg ug/kg ug/kg ug/kg <br /> LCS Batch# VS-8240 VS-8240 VS-8240 VS-8240 VS-8240 V5-8240 <br /> LCS % Recovery 112% 106% 81 1% 986% 950% 959% <br /> Surrogate Recovery 108% 980% 980% 980% 980% 980% <br /> Control Limits 70-130% 70-130% 70-130% 70-130% 70-130% 70-130 % <br /> MS/MSD Batch# VS-8240 VS-8240 VS-8240 VS-8240 VS-8240 VS-8240 <br /> I MS %Recovery 812% 61 4% 622% 916% 848% 934% <br /> Surrogate Recovery 871% 788% 788% 788% 788% 788% <br /> I MSD% Recovery 104% 945% 837% 958% 884% 946% <br /> Surrogate Recovery 877% 797% 797% 797% 797% 797% <br /> Relative%Difference 187% 395% 249% 408% 396% 104% <br /> Methanol Blank NO NO NO NO NO NO <br /> Surrogate Recovery 921% 988% 988% 988% 988% 988% <br /> I <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 /> of sample batch results Due to matrix effects,the QC limits and recoveries for MS/MSD's are advisory only and are not used to accept or <br /> reject batch results <br /> I <br /> ANALYST ✓tom APPROVED BY f <br /> Clary J Cone J e C-75h,111ps <br /> nvironmental Lab Director <br /> f <br />