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• CASTLE ANALYTICAL LABORATORY <br /> Environmental Testing Seances 2333 Shuttle Drive, Atwater CA 95301 Phone (209)384-2930 <br /> Certificate#2079 Fax (209)384-1507 <br /> Advanced GeoE nviron mental, Inc Client Protect ID Comfort Air Method EPA 5030/8015M,8020 <br /> of Northern California Reference Number 3288 Instrument ID Var-GC1 <br />' 4005 North Wilson Way Matnx Sad Prepared 11-1-00 <br /> Stockton, CA 95205 Analyst Clan Cone Analyzed 11-1-00 <br /> Adn Paul Dotson Reported 11-7-00 <br /> QUALITY CONTROL DATA REPORT <br /> IANALYTE Gasoline MTBE Benzene Toluene Ethyl Benzene Total Xylenes <br /> ISpike Concentration 220 41 6 25 6 154 368 185 <br /> Units mg/kg ug/kg ug/kg ug/kg uglkg ug/kg <br /> ILCS Batch# VS-NO10 VS-NO10 VS-N010 VS-NO10 VS-N010 VS-N010 <br /> LCS %Recovery 967% 886% 104% 100% 104% 102% <br /> Surrogate Recovery 109% 105% 105% 105% 105% 105% <br /> Control Limits 70-130% 70-130% 70-130% 70-130% 70-130% 70-130% <br /> MS/MSD Batch# VS-NO10 VS-N010 VS-N010 VS-N010 VS-N010 VS-N010 <br /> MS%Recovery 812% 872% 907% 862% 920% 899% <br /> Surrogate Recovery 102% 997% 997% 997% 997% 997% <br /> MSD% Recovery 772% 847% 897% 841% 888% 864% <br /> Surrogate Recovery 964% 938% 938% 938% 938% 938% <br /> Relative%Difference 475% 2 91% 1 15% 243% 355% 393% <br /> Methanol Blank ND ND ND ND ND ND <br /> Surrogate Recovery 996% 999% 999% 999% 999% 999% <br /> IPlease Note <br /> The LCS(Laboratory Check Sample)is a control sample of known, interferent free matrix that is fortified with representative analytes and <br /> I 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 /> ANALYST APPROVED BY <br />' Clan J Cone s Phi rps <br /> jEn,,ronCmental Lab Director <br />