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i <br /> I <br />' CASTLE ANALYTICAL LABORATORY <br /> Environmental Testing Services 2333 Shuttle Dnve, Atwater CA 95301 Phone (209)384-2930 <br /> Certificate#2480 Fax (209)384-1507 <br />' California Geophysical Client project ID Beneto#8 Method EPA 5030/8015M,8020 <br /> P O Box 578341 Reference Number 8403 Instrument ID Var-GC1 <br />' Modesto,CA 95357 Matrix Soil Extracted 08-01-05 <br /> Attn John Cu sen Analyst Clan Cone Analyzed 08-01-05 <br /> Reported 08-10-05 <br /> QUALITY CONTROL DATA REPORT <br /> I <br />' ANALYTE Gasoline MTBE Benzene Toluene Ethyl Benzene Total Xylenes <br />' Spike Concentration 220 45 2 272 153 368 178 <br /> Units mg/kg ug/kg ug/kg uglkg ug/kg uglkg <br />' LCS Batch# VS-8015 VS-8015 VS-8015 VS-8015 VS-8015 VS-8015 <br /> LCS %Recovery 108% 98 7% 146% 101% 107% 105% <br />' Surrogate Recovery 104% 98 3% 983% 983% 983% 983% <br /> Control Limits 70-130% 70-130% 70-130 % 70-130% 70-130% 70-130% <br /> I• MS/MSD Batch# VS-8015 VS-8015 VS-8015 VS-8015 VS-8015 VS-8015 <br /> MS%Recovery 826% 80 1% 87 1% 849% 905% 888% <br />' Surrogate Recovery 873% 836% 836% 836% 836% 836% <br /> MSD%Recovery 875% 825% 868% 838% 902% 885% <br /> Surrogate Recovery 870% 832% 832% 832% 832% 832% <br /> Relative%Difference 524% 292% 0 401% 122% 0295% 0 311% <br /> Method Blank ND ND ND ND ND ND <br /> ISurrogate Recovery 921% 902% 902% 902% 902% 902% <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 /> refect batch results <br /> (::7' APPROVED BY APPROVED BY (--W <br /> Clan J Cone7o,atory <br /> Phillips <br />' Laboratory Manager Director <br /> •I <br />