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1 <br /> • <br /> CASTLE ANALYTICAL LABORATORY <br /> I Environmental Testing Services 2333 Shuttle Drive,Atwater CA 95301 Phone (209)384-2930 <br /> Certificate#2480 Fax (209)384-1507 <br /> Biophysics Environmental Assessment Client Project ID Frontier Trucking-Tracy Method EPA 503018015M,8020 <br />' 3577 W Philadelphia Ave Reference Number 8258 instrument ID Var-GC1 <br /> Chino CA 91710 Sample Description Water Extracted 06-22-05 <br /> Attn Dave Blakely Analyst Jim Phillips Analyzed 06-22-05 <br />' Reported 06-30-05 <br />' QUALITY CONTROL DATA REPORT <br />' ANALYTE Gasoline MTBE Benzene Toluene Ethyl Benzene Total Xylenes <br /> Spike Concentration 110 2 16 134 7 58 1 82 888 <br /> Units ug/L uglL ug1L uglL ug/L uglL <br />' LCS Batch# VW-6225A VW-6225A VW-6225A VW-6225A VW-6225A VW-6225A <br /> LCS%Recovery 102% 101% 103% 946% 937% 950% <br /> Surrogate Recovery 999% 969% 969% 969% 969% 969% _ <br /> Control Limits 70-130% 70-130% 70-130% 70-130% 70-130% 70-130% <br /> MS/MSD Batch# VW-6225A VW-6225A VW-6225A VW-6225A VW-6225An VW-6225A <br /> — Spike Concentration 110 2 16 1 34 7 58 1 82 888 <br />' MS%Recovery 105% 774% 103% 991% 984% 993% <br /> Surrogate Recovery 102% 101% 101% 101% 101% 101% <br /> MSD%Recovery 101% 787% 105% 100% 101% 102% <br /> Surrogate Recovery 106% 104% 104% 104% 104% 104% <br /> Relative%Difference 395% 144% "` 143% 1 30% 276% 244% <br /> Method Blank ND ND ND ND ND ND <br /> Surrogate Recovery 963% 975% 975% 975% 975% 975% <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 MSIMSD's are advisory only and are not used to accept or <br /> reject batch results r <br /> APPROVED BY APPROVED BY <br /> Clan J Cone Jam Phillips <br /> Laboratory Manager L oratory Director <br />