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1 <br />' CASTLE ANALYTICAL LABORATORY <br />' Environmental Testing Services 2333 Shuttle Drive, Atwater, CA 95301 Phone (209) 384-2930 <br /> Fax (2091384-1507 <br /> Advanced GeoEnvironmental, Inc Client Project ID Cal Fuels Method EPA 503018015M 8020 <br />' of Northern California Reference Number 1316 Instrument ID Var-GC1 <br /> 4005 N Wilson Way Matrix Soil Prepared 11-5-97 <br /> Stockton, CA 95205 Analyst Clan Cone Analyzed 11-6-97, 11-7-97 <br /> Attn Tim Cuellar Reported 11-12-97 <br /> QUALITY CONTROL DATA REPORT <br />' ANALYTE Gasoline MTBE Benzene Toluene Ethyl Benzene Total Xylenes <br />' Spike Concentration 2 00 200 200 20 0 200 400 <br />' Units mg/kg ug/kg ug/kg ug/kg ug/kg ug/kg <br /> LCS Batch # VG N057A VB-NO57A VB-N057A VB N057A VB-N057A VB N057A <br /> LCS % Recovery 113% 740% 764% 788% 77 1% 81 1% <br /> Surrogate Recovery 109% 110% 110% 110% 110% 110% <br /> • Control Limits 70-130 % 70-130 % 70 130 % 70-130 % 70-130 % 70-130 % <br /> MS/MSD Batch # VG-NO57A VB N057A VB N057A VB-N057A VB-NO57A VB-NO57A <br /> MS % Recovery 544% 45 3% 697% 723% 630% 75 9% <br /> Surrogate Recovery 78 1% B1 2% 81 2% 812% 81 2% 81 2% <br /> I MSD % Recovery 81 1% 69 1% 11715% 105% 734% 85 3% <br /> Surrogate Recovery 113% 970% 970% 970% 970% 970% <br /> Relative % Difference 295% 306% 149% 103% 968% 542% <br /> Methanol Blank NO NO ND ND NO ND <br /> Surrogate Recovery 1 1 1% 111% 1 1 1% 1 1 1% 1 1 1% 1 1 1% <br /> Please Note <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 /> ANALYST &19Y APPROVED BY \ <br /> Cla J Cone Ja es P ilkps <br /> • I nvrronmental Lab Director <br /> I <br />