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' AdhCASTLE ANALYTICAL LABORATORY Environmental Testing Services 2333 Shuttle Drive, Atwater, CA 95301 Phone: (209) 3$4-2930 Certificate #2079 Fax: (209) 384-1507 ' Advanced GeaEnvironmental, Inc. Client Project 1D: Paiges Towing Method: EPA 5030/8015M,8020 of Northern California Reference Number- 2188 Instrument ID: Var-GC1 4005 North Wilson Way Matrix: Water Prepared: 4-19-99 Stockton, CA 95205 Analyst: Jim Phillips Analyzed: 4-19-99 Attn: Tim Cuellar Reported: 4-23-99 QUALITY CONTROL DATA REPORT 1 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 uglL ugiL ug/L ug1L uglL LCS Batch #: VW-4199 VW-4199 VW-4199 VW-4199 VW-4199 VW-4199 ' LCS % Recovery: 112% 100% 104% 91.7% 96.8% 84.4% Surrogate Recovery: 101% 99.1% 99.1% 99.1% 99.1% 99.1% .Control Limits: 70-130 % 70-130 % 70-130% 70-130 % 70-130 % 70-130 % MS/MSD Batch #: VW-4199 VW-4199 VW-4199 VW-4199 VW-4199 VW-4199 ' Spike Concentration: 110 2.22 1.34 7.82 1.84 9.48 MS % Recovery: 100% 108% 112% 97.9% 100% 89.9% Surrogate Recovery: 103% 99.5% 99.5% 99.5% 99.5% 99.5% MSD % Recovery: 101% ill% 113% 98.1% 102% 91.3% Surrogate Recovery: 104% 100% 100% 100% 100% 100% ' Relative % Difference: 0.542% 2.12% 1.04% 0.247% 1.53% 1.52% ' Methanol Blank : ND ND ND ND ND ND Surrogate Recovery: 96.6% 96.2% 96.2% 96.2% 96.2% 96.2% 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 MSlMSD's are advisory only and are not used to accept or ' reject batch results. ANALYST: APPROVED BY. ' ri J. Cone J es C. Phillips Environmental Lab Director