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w �.. CASTLE ANALYTICAL LABORATORY I Environmental Testing Services 2333 Shuttle Drive,Atwater, CA 95301 Phone: (209)384-2930 Certificate#2480 Fax: (209)384-1507 [[Attn: ase Environmental Client Project ID:Manna Pro-Stockton Method: EPA 5030/8015M,8020 eneman Ave. B-240 Reference Number:9009 Instrument ID:Var-GC1 o,CA 95356 Sample Description:Water Extracted:03-22-06 %W eve Lankford Analyst: Jim Phillips Analyzed:03-22-06 Reported:03-31-06 a.. 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 uglL ug/L uglL LCS Batch#: VW-3226 VW-3226 VW-3226 VW-3226 VW-3226 VW-3226 LCS%Recovery: 94.5% 79.3% 100% 105% 106% ° Surrogate Recovery: ° 0 10 /° 9 ry: 99.2/0 101/0 101% 101% 101% 1011% Control Limits: 70-130% 70-130% 70-130% 70-130% 70-130% 70-130% MS/MSD Batch#: VW-3226 VW-3226 VW-3226 VW-3226 VW-3226 VW-3226 w Spike Concentration: 110 2.16 1.34 7.56 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 6-0 Surrogate Recovery: 101% 102% 102% 102% 102% 102% 1. 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. L r' APPROVED BY: rIla 04"