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CASTLE ANALYTICAL LABORATORY <br /> Environmental Testing Services P O Box 1360, Winton, CA 95388 Phone (209) 384-2930 <br />' Certificate #2079 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 815 Instrument 1D Var-GC1 <br /> 1803 West March Lane, Suite A Matrix Water Prepared 7-24-96 <br /> Stockton, CA 95207 Analyst Jim Phillips Analyzed 7-24-96 <br />' Attn Tim Cuellar Reported 7 29-96 <br />' QUALITY CONTROL DATA REPORT <br />' ANALYTE Gasoline Benzene Toluene Ethyl Benzene Total Xylenes <br />' Spike Concentration 100 1 00 1 00 1 00 200 <br /> Units ug/L ug/L ug/L ug/L ug/L <br />' LCS Batch # VG-7246W VB-7246W VB-7246W VB-7246W VB 7246W <br /> LCS % Recovery 94 6% 100% 113% 107% 112% <br /> Surrogate Recovery 103% 966% 966% 966% 96 6% <br /> Control Limits 70-130 % 70-130 % 70 130 % 70-130 % 70-130 % <br />' MS/MSD Batch # VG-7246W VB-7246W VB-7246W VB-7246W VB-7246W <br /> MS % Recovery 99 9% 92 1% 939% 974% 954% <br /> Surrogate Recovery 99 1% 952% 95 2% 95 2% 952% <br /> MSD % Recovery 94 5% 900% 91 8% 969% 947% <br /> Surrogate Recovery 100% 988% 98 8% 98 8% 988% <br /> Relative % Difference 542% 231% 2 12% 0504% 0 752% <br /> Methanol Blank NO ND NO ND NO <br /> Surrogate Recovery 96 8% 964% 964% 964% 964% <br /> The LCS (Laboratory Check Sample) is a control sample of <br /> p p 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 MSIMSD's are advisory only and are not used to accept or <br /> reject batch results <br /> 1 <br /> ANALYST APPROVED BY <br /> Clary J Cone Pme-sPhi 11 —S <br /> Environmental Lab Director, <br />