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lie CASTLE ANALYTICAL LABORATORY Environmental Testing Services 2333 Shuttle Drive,Atwater,CA 95301 Phone: (209)384-2930 ' Certificate#2480 Fax: (209)384-1507 Geo-Phase Environmental Client Project ID:Cutter Lumber Method: EPA 503018015M,8020 2973 Veneman Ave. B-240 Reference Number:8242 Instrument ID:Var-GC1 Modesto,CA 95356 Sample Description:Water Extracted:06-17-05 Attn:Steve Lankford Analyst: Jim Phillips Analyzed:06-17-05 Reported:06-23-05 L QUALITY CONTROL DATA REPORT 1 ' ANALYTE Gasoline MTBE Benzene, Toluene Ethyl Benzene Total Xylenes Spike Concentration: 110 2.16 1.34 7.58 1.82 8,88 ' Units: uglL uglL uglL ug/L ug/L ug/L LCS Batch#: VW-6175bhp2 VW-6175bhp2 VW-6175bhp2 VW-6175bhp2 VW-6175bhp2 VW-6175bhp2 ' LCS%Recovery: 105% 91.4% 101% 101% 110% 107% Surrogate Recovery: 106% 102% 102% 102% 102% 102% . Control Limits: 70-130% 70-130% 70-130% 70-130% 70-130% 70-130% MSIMSD Batch#: VW-6175bhp2 VW-6175bhp2 VW-6175bhp2 VW 6175bhp2 VW=6175bhp2 VW-6175bhp2 ' Spike Concentration: 110 2.16 1.34 7.58 1.82 8.88 MS%Recovery: 95.8% 63.7% 90.4% 97.7% 106% 105% ' Surrogate Recovery: 105% 102% 102% 102% 102% 102% MSD%Recovery: 94.2% 69.8% 98.5% 102% 111% 108% Surrogate Recovery: 108% 103% 103% 103% 103% 103% Relative%Difference: 1.53% 6.85% 8.17% 4.34% 3.81% 3.27% Method Blank: ND ND NO NO NO NO Surrogate Recovery: 102% 101% 101% 101% 101% 101% ' The LCS(Laboratory Check Sample)is a control sample of known,interferent free matrix that is fortified with anal representative es and P analytes 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 MSIMSD's are advisory only and are not used to accept or reject batch results. APPROVED BY: APPROVED BY: Clari J. Cone Jameyt. Phillips Laboratory Manager Lab tory Director 1