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r <br />' 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 />' California Geophysical Client Project ED Beneto#8 Method EPA 5030/8015M,8020 <br /> P O Box 578341 Reference Number 8367 Instrument ID Var-GC1 <br /> Modesto,CA 95357 Sample Description Water Extracted 07-22-05 <br />' Atin .John Cussen Analyst Jim Phillips Analyzed 07-22-05 <br /> Reported 08-08-05 <br /> r <br /> QUALITY CONTROL DATA REPORT <br /> Ii <br /> ANALYTE Gasoline MTBE Benzene Toluene Ethyl Benzene Total Xylenes <br />' Spike Concentration 110 2 16 1 34 758 1 82 8 88 <br />' Units ug/L uglL ug/L ug/L uglL uglL <br /> LCS Batch# VW-7225 VW-7225 VW-7225 VW-7225 VW-7225 VW-7225 <br />' LCS%Recovery 941% 877% 785% 958% 100% 104% <br /> Surrogate Recovery 983% 976% 976% 976% 976% 976% <br /> Control Limits 70-130% 70-130% 70-130% 70-130% 70-130% 70-130% <br /> 1 <br /> MS/MSD Batch# VW-7225 VW-7225 VW-7225 VW-7225 VW-7225 VW-7225 <br />' Spike Concentration 110 2 16 1 34 758 182 8 88 <br /> MS%Recovery 914% 908% 747% 914% 626% 995% <br /> r Surrogate Recovery 123% 107% 107% 107% 107% 107% <br /> MSD%Recovery 939% 889% 730% 888% 638% 993% <br /> Surrogate Recovery 1220/6 105% 105% 105% 105% 105% <br /> rRelative%Difference 1 19% 215% 1 53% 2 81% 1 13% 0223% <br />' Method Blank ND ND ND ND ND ND <br /> Surrogate Recovery 969% 974% 974% 974% 974% 974% <br />' The LCS(Laboratory Check Sample)is a control sample of known,interferent free matnx that is fortified with representative analytes and <br /> analyzed using the same reagents,preparation and analytical methods employed for the samples The LGS%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 /> r <br /> APPROVED BY aL APPROVED BY <br /> r Clan J Cone James C Phdlrps <br /> Laboratory Manager Laboratory Director <br /> r <br />