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1 . 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 ID: Paige's Towing Method: EPA 503018015M,8020 ' of Northern California Reference Number: 2366 Instrument ID:Var-GC1 4005 North Wilson Way Matrix: Water Prepared: 7-15-99 Stockton, CA 95205 Analyst: Jim Phillips Analyzed: 7-15-99 Attn: Tim Cuellar Reported: 7-21-99 ' QUALITY CONTROL DATA REPORT ANALYTE Gasoline MTBE Benzene Toluene Ethyl Benzene Total Xylenes Spike Concentration: 110 2.22 1.34 7.82 1.84 9.48 Units: ug/L ug/L ug/L ug/L ug/L ug/L LCS Batch #: VW-7159 VW-7159 VW-7159 VW-7159 VW-7159 VW-7159 LCS % Recovery: 98.9% 112% 104% 95.2% 97.9% 87.2% Surrogate Recovery: 98.9% 96.3% 96.3% 96.3% 96.3% 96.3% Control Limits: 70-130 % 70-130 % 70-130 % 70-130 % 70-130 % 70-130 % MS/MSD Batch #: VW-7159 VW-7159 VW-7159 VW-7159 VW-7159 VW-7159 Spike Concentration: 110 2.22 1.34 7.82 1.84 9.48 ' MS % Recovery: 97.1% 116% 108% 91.7% 103% 90.3% Surrogate Recovery: 105% 102% 102% 102% 102% 102% MSD % Recovery: 92.7% 120% 105% 87.4% 97.1% 85.1% Surrogate Recovery: 105% 101% 101% 101% 101% 101% Relative % Difference: 4.34% 3.55% 2.53% 4.73% 5.41% 5.92% 1 B Methanol Blank : NO NO NO NO NO ND Surrogate Recovery: 99.6% 99.0% 99.0% 99.0% 99.0% 99.0% ' 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 OC limits and recoveries for MS/MSD's are advisory only and are not used to accept or reject batch results. Ak ANALYST: l APPROVE BY: Clari J. Cone ; C.a hillips nvironmenta!Lab Director