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. CASTLE ANALYTICAL LABORATORY Environmental Testing Services P 0 Box 1360, Winton, CA 95388 Phone (209) 384 2930 Certificate #2079 Fax (209) 384-1507 Advanced GeoEnvironmental, Inc Client Project ID Cal Fuels Method EPA 5030/8015M 8020 of Northern California Reference Number 975 instrument ID Var-GC1 1803 West March Lane, Suite A Matrix Water Prepared 12-31-96 Stockton, CA 95207 Analyst Jim Phillips Analyzed 12-31 96 i Am Tim Cuellar Reported 1-7-97 I QUALITY CONTROL DATA REPORT ANALYTE Gasoline MTBE Benzene Toluene Ethyl Benzene Total Xylenes Spike Concentration 100 1 00 1 00 1 00 1 00 200 Units ugll_ uglL ug1L uglL ug/L uglL LCS Batch # VG-D316W VB D316W VB D316W VB-D316W VB-D316W VB D316W LCS % Recovery NA* NA* NA* NA* NA* NA* Surrogate Recovery NA* NA* NA* NA* NA* NA* Control Limits 70-130 % 70-130 % 70-130 % 70-130 % 70-130 % 70 130 % LCSAILCSB Batch 4 VG-D316W VB D316W VB-D316W VB-D316W VB D316W VB-D316W LCSA % Recovery 943% 97 8% 96 9% 105% 104% 105% Surrogate Recovery 1100/0 109% . 109% 109% 109% 109% LCSB % Recovery 909% 993% 97 2% 106% 107% 107% Surrogate Recovery 104% 100% 100% 100% 100% 1000/0 Relative % Difference 3 63% 1 56% 0319% 1 61% 2 37% 2 22% Methanol Blank ND ND ND ND ND ND Surrogate Recovery 108% 108% 108% 108% 108% 108% * Note No matrix spikes run for this set due to matrix interference- Duplicate control spikes were analyzed and are reported below 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 MSIMSD's are advisory only and are not used to accept or reject batch results ANALYST APPROVED BY 21 Clary J Cane J es C Phdfir, nvrronmental Lab Director