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i ' CASTLE ANALYTICAL LABORATORY nvironmental 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 5030/8015M,8020 ' 2973 Veneman Ave. 8-240 Reference Number:8577 Instrument ID:Var-GC1 Modesto,CA 95356 Sample Description:Water Extracted:09-21-05 Attn: Steve Lankford Analyst: Jim Phillips Analyzed:09-21-05 Reported:09-28-05 i 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 I ' Units: ug1L uglL uglL uglL uglL ug/L LCS Batch#: VW-9215 VW-9215 VW-9215 VW-9215 VW-9215 VW-9215 ' LCS%Recovery: 88.2% 87.5% 94.7% 109% 118% 120% Surrogate Recovery: 104% 103% 103% 103% 103% 103% ' �ontrol Limits: 70-130% 70-130% 70-130% 70-130% 70-130% 70-130% i MS/MSD Batch#: VW-9215 VW-9215 VW-9215 VW-9215 VW-9215 VW-9215 Spike Concentration: 110 2.16 1.34 7.58 1.82 8.$8 MS%Recovery: 88.7% 91.9% 86.4% 110% 121% 123% ' Surrogate Recovery: 111% 112% 112% 112% 112% 112% MSD%Recovery: 87.0% 99.6% 86.7% 109% 119% 121% Surrogate Recovery: 109% 110% 110% 110% 110% 110% ' Relative%Difference: 1.72% 7.07% 0.287% 1.48% 1.68% 2.00% ' Method Blank: NO NO NO NO NO ND Surrogate Recovery: 96.3% 99.3% 99.3% 99.3% 99.3% 99.3% 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. i ' APPROVED BY: James illips/Labora ry Director or Clan J. Cone/Laboratory Manager i