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CASTLE ANALYTICAL LABORATORY Environmental Testing Services P.O. Box 1360, Winton, CA. 95388 Phone: (209) 384-2930 ' Certificate #2079 Fax: {209) 384-1507 Advanced Geo Environmental, Inc. Client Project ID: Flag City Chevron Method: EPA 5030/8015M,8020 ' of Northern California Reference Number: 862 Instrument ID: Var-GC1 1803 West March Lane, Suite A Matrix: Water Prepared: 8-30-96 Stockton, CA 95207 Analyst: Jim Phillips Analyzed: 8-30-96 Attn: Tim Cuellar Reported: 9-4-96 1 QUALITY CONTROL DATA REPORT 1 ' ANALYTE Gasoline MTBE Benzene Toluene Ethyl Benzene Total Xylenes Spike Concentration: 100 1.00 1.00 1.00 1.00 2.00 ' Units: ug/L ug/L ug/L ug/L ug/L ug/L LCS Batch #: VG-8306W VB-8306W VB-8306W VS-8306W VB-6306W VB-8306W ' LCS % Recovery: 102% 118% 103% 114% 105% 112% Surrogate Recovery: 101% 99.9% 99.9% 99.9% 99.9% 99.9% Control Limits: 70-130 % 70-130 % 70-130 % 70-130 % 70-130 % 70-130 % MSIMSD Batch #: VG-8306W VB-8306W VB-8306W VB-8306W VB-8306W VS-8306W ' MS %Recovery: 103% 31.8% 100% 105% 105% 106% Surrogate Recovery: 101% 97.6% 97.6% 97.6% 97.6% 97.6% MSD % Recovery: 107% 33.4% 105% 105% 110% 110% Surrogate Recovery: 102% 97.7% 97.7% 97.7% 97.7% 97.7% Relative % Difference: 4,20% 0.331% 4.92% 0.552% 4.85% 3,13% ' Methanol Blank : ND ND ND ND ND ND Surrogate Recovery: 96.7% 96.7% 96.7% 96.7% 96.7% 96.7% Please Note: 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. f \ ANALYST: — APPROVED BY: C/ari J. Cone / Philli s Environmenta/Lab Director