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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 /> Geological Technics, Inc Client Project ID J M Equipment Method EPA 503018015M,8020 <br /> ' 1101 7th Street Reference Number 8491 Instrument ID Var-GC1 <br /> Modesto,CA 95354 Sample Description Water Extracted 08-23-05 <br /> Attn Joseph Angulo Analyst Jim Phillips Analyzed 08-23-05 <br /> Reported 09-06-05 <br /> ' QUALITY CONTROL DATA REPORT <br /> ' ANALYTE Gasoline MTBE Benzene Toluene Ethyl Benzene Total Xylenes <br /> Spike Concentration 110 216 1 34 758 1 82 888 <br /> ' Units ug/L ug/L ug/L ug/L ug/L ug/L <br /> t LCS Batch# VW-8235 VW-8235 VW-8235 VIN-8235 VW-8235 VW-8235 <br /> LCS%Recovery 993% 977% 117% 126% 129% 133% <br /> Surrogate Recovery 101% 976% 976% 976% 976% 976% <br /> Control Limits 70-130% 70-130% 70-130% 70-130% 70-130% 70-130% <br /> ' MS/MSD Batch# VW-8235 VW-8235 VW-8235 VW-8235 VW-8235 VW-8235 <br /> Spike Concentration 910 216 1 34 758 1 82 888 <br /> ' MS%Recovery 968% 104% 927% 102% 102% 101% <br /> Surrogate Recovery 964% 937% 937% 937% 937% 937% <br /> MSD%Recovery 976% 822% 990% 101% 102% 102% <br /> ' Surrogate Recovery 958% 932% 932% 932% 932% 932% <br /> Relative%Difference 0827% 236% 626% 0720% 0165% 0646% <br /> ' Method Blank ND ND ND ND ND ND <br /> Surrogate Recovery 892% 890% 890% 890% 890% 890% <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 analyt,cal methods employed for the samples The LCS%recovery,s 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 /> 1 <br /> ANALYST APPROVED BY <br /> Clan J Cone James C Phillips <br /> Laboratory Manager Laboratory Director <br />