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I CASTLE ANALYTICAL LABORATORY Environmental Testing Services 2333 Shuttle Drive,Atwater,CA 95301 Phone (209)384-2930 ' Certificate#2460 Fax (209)384-1507 Geo-Phase Environmental Client Project ID Manna Pro Method EPA 5030/8015M,8020 ' 2973 Veneman Ave B-240 Reference Number 8243 Instrument ID Var-GC1 Modesto,CA 95356 Sample Description Water Extracted 06-20-05 Attn Steve Lankford Analyst Jim Phillips Analyzed 06-20-05 Reported 06-23-05 QUALITY CONTROL DATA REPORT ' ANALYTE Gasoline MTBE Benzene Toluene Ethyl Benzene Total Xylenes Spike Concentration 110 2 16 134 758 1 82 888 ' Units ug/L ug/L ug/L ug/L ug/L ug/L LCS Batch# VW-6205 VW-6205 VW-6205 VW-6205 VW-6205 VW-6205 ' LCS%Recovery 968% 832% 934% 919% 971% 938% Surrogate Recovery 935% 900% 900% 900% 900% 900% lie Control Limits 70-130% 70-130% 70-130% 70-130% 70-130% 70-130% MSIMSD Batch# VW-6205 VW-6205 VW-6205 VW-6205 VW-6205 VW-6205 Spike Concentration 110 2 16 1 34 758 1 82 888 MS%Recovery 984% 717% 870% 959% 977% 999% ' Surrogate Recovery 101% 995% 995% 995% 995% 995% MSD%Recovery 974% 682% 851% 936% 960% 977% Surrogate Recovery 1116% 967% 967% 967% 967% 967% Relative%Difference 1 01% 494% 223% 233% 173% 215% ' Method Blank ND ND ND ND ND ND Surrogate Recovery 945% 958% 958% 958% 958% 958% ' 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 OC limits and recoveries for MS/MSD's are advisory only and are not used to accept or reject batch results 1 � APPROVED BY Vv"" APPROVED BY ' Clan J ne Jame 'Phillips Laboratory Manager Lab story Director 1