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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-Stockton Method: EPA 503018015M,8020 2973 Veneman Ave.B-240 Reference Number:9008 Instrument ID:Var-GC1 Modesto,CA 95356 Sample Description:Water Extracted:03-22-06 Attn:Steve Lankford Analyst: Jim Phillips Analyzed:03-22-06 Reported:03-31-06 QUALITY CONTROL DATA REPORT ' ANALYTE Gasoline MTBE Benzene Toluene Ethyl Benzene Total Xylenes Spike Concentration: 110 2.16 1.34 7.58 1.82 8.88 Units: ug/L uglL ug/L ug1L uglL uglL LCS Batch#: VW-3226 VW-3226 VW-3226 VW-3226 VW-3226 VW-3226 LCS%Recovery: 94.5% 79.3% 100% 105% 106% 109% Surrogate Recovery: 99.2% 101% 101% 101% 101% 101% lie Control Limits: 70-130% 70-130% 70-130% 70-130% 70-130% 70-130% MSIMSD Batch#: VW-3226 VW-3226 VW-3226 VW-3226 VW-3226 VW-3225 ' Spike Concentration: 110 2.16 1.34 7.58 1.82 8.88 ' MS%Recovery: 85.8% 116% 93.4% 106% 105% 110% Surrogate Recovery: 102% 105% 105% 105% 105% 105% MSD%Recovery: 76.2% 141% 90.1% 96.2% 99.0% 104% Surrogate Recovery: 104% 105% 105% 105% 105% 105% Relative%Difference: 10.1% 18.8% 3.46% 9.72% 5.70% 5.43% ' Method Blank: ND ND ND ND ND ND Surrogate Recovery: 101% 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: 0 James C.PKA(pYl)6-53W&ry D ctor or Clari J. Cone/La ratory Manager I