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l CASTLE ANALYTICAL LABORATORY Environmental Testing Services 2333 Shuttle Drive, Atwater, CA 95301 Phone: (209)384-2930 ' Certificate#2079 Fax: (209)384-1507 Advanced GeoEnvironmental, Inc. Client Project 10:Grewal's Market Method: EPA 503018015M,8020 ' of Northern California Reference Number: 3539 Instrument ID:Var-GC1 837 Shaw Road Matrix:Water Prepared: 2-20-01 Stockton, CA 95215 Analyst: Jim Phillips Analyzed: 2-20-01 Attn:Tim Cuellar Reported: 2-27-01 ' QUALITY CONTROL DATA REPORT ' ANALYTE Gasoline MTBE Benzene Toluene Ethyl Benzene Total Xylenes Spike Concentration: 140 2.08 1.28 7.72 1.84 9.24 ' Units: ug/L ugiL uglL uglL ug1L ug/L LCS Batch#: VW-2201 VW-2201 VW-2201 VW-2201 VW-2201 VW-2201 ' LCS % Recovery: 97:6% 86.7% 111% 99.7% 101% 98.4% Surrogate Recovery: 103% 99.7% 99.7% 99.7% 99.7% 99.7% Control Limits: 70-130% 70-130% 70-130% 70-130% 70-130% 70-130% MSlMSD Batch#: VW-2201 VW-2201 VW-2201 VW-2201 VW-2201 VW-2201 Spike Concentration: 110 2.08 1.28 7.72 1.84 9.24 MS% Recovery; 88.4% 115% 113% 99.4% 102% 98.3% Surrogate Recovery: 101% 96.8% 96.8% 96.8% 96.8% 96.8% MSD%Recovery: 89.7% 125% 112% 98.8% 102% 98.2% ' Surrogate Recovery: 104% 99.7% 99.7% 99,7% 99.7% 99.7% Relative%Difference: 1,13% 7.55% 0.349% 0.661% 0.0689% 0.170% t Methanol Blank: ND ND ND ND ND ND Surrogate Recovery: 101% 101% 101% 101% 101% 101% ' 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 MS/MSD's are advisory only and are not used to accept or ' reject batch results. ANALYST: APPROVED BY: /( ° ori J. Cone Phillips Laboratory Director