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I <br /> CASTLE ANALYTICAL LABORATORY <br />' Environmental Testing Services 2333 Shuttle Drive, Atwater, CA 95301 Phone (209) 384-2930 <br /> Certificate 112079 Fax (209) 384-1507 <br /> Advanced GeoEnvironmental, Inc Client Project ID Top Filling Station Method EPA 5030/8015M,8020 <br /> of Northern California Reference Number 1498 Instrument ID Var-GC1 <br /> 4005 North Wilson Way Matrix Water Prepared 3-24-98 <br /> Stockton, CA 95205 Analyst Jim Phillips Analyzed 3-2498 <br /> Attn Tim Cuellar Reported 3-25 9B <br /> QUALITY CONTROL DATA REPORT <br /> iANALYTE Gasoline MTBE Benzene Toluene Ethyl Benzene Total Xylenes <br /> Spike Concentration 100 1 00 1 00 1 00 1 00 200 <br /> Units ug/L ug/L ug/L ug/L ug/L ug/L <br /> ILCS Batch # VG-3248W VB-3248W VB-3248W VB-3248W VB-3248W VB-3248W <br /> LCS % Recovery 96 5% 123% 103% 106% 101% 103% <br />'ie Surrogate Recovery 103% 95 5% 955% 95 5% 95 5% 95 5% <br /> Control Limits 70-130 % 70-130 % 70-130 % 70-130 % 70-130 % 70-130 % <br /> MS/MSD Batch 11 VG-3248W VB-3248W VB-3248W VB 3248W VB-3248W VB-3248W <br /> IVIS % Recovery 840% 108% 102% 102% 102% 102% <br /> Surrogate Recovery 105% 101% 101% 101% 101% 101% <br /> MSD % Recovery 87 8% 105% 997% 986% 100% 100% <br /> Surrogate Recovery 103% 99 5% 99 5% 995% 99 5% 195% <br /> IRelative % Difference 407% 2 96% 250% 270% 1 59% 1 61% <br />' Methanol Blank ND ND ND ND NO ND <br /> Surrogate Recovery 98 7% 988% 988% 988% 988% 988% <br /> The LCS (Laboratory Check Sample} is a control sample of known, interferent free matrix that is fortified with representative analytes and <br /> analyzed using the same reagents, preparation and analytical methods employed for the samples The LCS % recovery is used for validation <br /> 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 <br /> reject batch results <br /> 1 <br /> ANALYST APPROVED BY 1 <br /> Clan J Cone s I <br />' Environmental Lab Director <br />