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CASTLE ANALYTICAL LABORATORY Environmental Testing Services 2333 Shuttle Drive,Atwater,CA 95301 Ph (209)384-2930 Fax Certificate#2480 Fax (209)384-1507 Foothill Engineering Client Project ID Vogue Cleaners Method EPA 5030/8015M,8020 8442 Story Ridge Way Reference Number 8664 Instrument ID Var-GCi Antelope,CA 95843 Sample Description Water Extracted 1 D-24-05 Attn Mike Vlach Analyst Jim Phillips Analyzed 10-24-05 Reported 11-03-05 QUALITY CONTROL DATA REPORT ANALYTE Gasoline MTBE Benzene Toluene Ethyl Benzene Total Xylenes Spike Concentration 110 2 16 1 34 758 182 888 Units ug/L ug/L ug/L ug/L ug1L ug/L LCS Batch# VW-0245bhp2 VW-0245bhp2 VW-0245bhp2 VW-0245bhp2 VW-0245bhp2 VW-0245bhp2 LCS%Recovery 105% 902% 103% 960% 103% 100% Surrogate Recovery 98 9°A 957% 957% 957% 957% 957% . Control Limas 70-130% 70-130% 70-130% 70-130% 70-130% 70-130% MS/MSD Batch# VW-0245bhp2 VW-0245bhp2 VW-0245bhp2 VW-0245bhp2 VW-0245bhp2 VW-0245bhp2 Spike Concentration 110 2 16 1 34 758 182 888 MS%Recovery 971% 950% 105% 982% 103% 102% Surrogate Recovery 105% 103% 103% 103% 103% 103% MSD%Recovery 101% 149% 107% 101% 105% 105% Surrogate Recovery 106% 103% 103°x6 103% 103% 103% Relative%Difference 337% 440% 218% 2,42% 2 41% 278% Method Blank ND ND ND ND ND ND Surrogate Recovery 100% 102% 102% 102% 102% 102% The LCS(Laboratory Check Sample)is a control sample of known,interferent free matrix that is fortified with representative analytes and analyzed using the same reagents,preparation and analytical methods employed for the samples The LCS%recovery is used for validation 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 reject batch results APPROVED BY James C Phifit /Laboratory Director or Clan J Cone/ eboratory Manager