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@1/03/2002 13:54 2094678 AGE STOCKTON • PAGE 10 CASTLE ANALYTICAL LABORATORY Environmental Testing Services 2333 Shuttle Drive,Atwater,CA 95301 Phone: (209)394-2930 Certificate#1.2480 Fax: (209)3841507 Advanced GeoEnvironmental, Inc. Client Project ID:Top Filling Method:EPA 5030/8015M,8020 of Northern Cellfomia Reference Number.4187 Instrument ID:Var-GC1 837 Shaw Road Sample Description:Water Prepared: 11.5-01 Stockton,CA 95218 Analyst: Jim Phillips Analyzed: 11.5-01 Attn:Tim Cuellar Reported:1 1-15-01 QUALITY CONTROL DATA REPORT ANALYTE Gasoline MTBE Benzene Toluene Ethyl Benzene Total Xylanes Spike Concentration: 110 2.10 1.32 7.94 1.84 9.22 Units: ug/L ugA, ug/L ug/L ug/L ug/L 1-CS Batch$; VW-N051 VW-N051 VW-N051 VW-NO51 VW-N051 VW-NO51 114% 97.9% 105% 99.3% 103% 100% Surrogate Recovery: 96.9% 94.6% 94.6% 94.5% 94.6% 94.6% Control Limits: 70-130% 70-130% 70-130°A 70-130% 70.130% 70-130% MS/MSD Batch#: VW-N051 VW-14051 VW-N051 VW-No51 VW-NO51 VW-NO51 Spike Concentration: 110 2.10 1.32 7 94 1.84 9.22 MS%Recovery: 102% 95.9% 110% 102% 106% 103% Surrogate Recovery: 97.5% 95.3% 95.3% 95.3% 95,3% 95.3% MSD%Recovery: 96.9% 94.1% 105% 101% 105% 101% Surrogate Recovery; 99.8% 96.5% 96.5% 96.5% 96.5% 96.5% Relative`Yo Difference: 5.43% 1,79% 4.53% 0.772% 0.890% 1.54% Methanol Blank: ND ND ND ND ND NO Surrogate Recovery: 94,6% 95.5% 95.5% 95.5% 95.5% 95.5% 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 LOS%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: Clan J. Cone a C. Phillips Laboratory Director