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CASTLE ANALYTICAL LABORATORY <br /> Environmental Testing Services P O Box 1360,Winton, CA 95388 Phone (209) 384-2930 <br /> Fax (209) 384-1507 <br /> Advanced GeoEnvironmenta1, Inc Client Project ID Cal Fuels Method EPA 503018015M,8020 <br /> of Northern California Reference Number 975 Instrument 1D Var-GC1 <br /> 1803 West March Lane, Suite A Matrix Soil Prepared 12-27-96 <br /> Stockton, CA 95207 Analyst Jim Phillips Analyzed 12-30-96 <br /> Attn Tim Cuellar Reported 1-7-97 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Gasoline MTBE Benzene Toluene Ethyl Benzene Total Xylenes <br /> Spike Concentration 200 200 200 200 200 400 <br /> Units mg/kg uglkg ug/kg ug/kg ug/kg ug/kg <br /> LCS Batch # VG-D276 VB-D276 VB-D276 VB-D276 V8 D276 VB D276 <br /> LCS % Recovery 115% 978% 120% 115% 109% 116% <br /> Surrogate Recovery NA 99 2% 992% 99 2% 99 2% 99 2% <br /> Control Limits 70-130 % 70-130 % 70-130 % 70-130 % 70-130 % 70130 % <br />• <br /> MSIMSD Batch # VG D276 VB D276 VB D276 VB D276 VB D276 VE D276 <br /> MS % Recovery 63 8% 748% 808% 79 8% 73 5% 742% <br /> Surrogate Recovery NA 71 1% 71 1% 71 1% 71 1% 71 1% <br /> MSD % Recovery 66 0% 988% 750% 72 5% 753% 829% <br /> Surrogate Recovery 76 2% 709% 709% 709% 709% 709% <br /> Relative % Difference 327% 248% 745% 8 88% 2 32% 983% <br /> Methanol Blank NO NO NO NO ND NO <br /> Surrogate Recovery 100% 100% 100% 100% 100% 100% <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 /> C&T-:&Z -A <br /> ANALYST APPROVED BY <br /> Clan J Cone jar <br /> hdhps <br /> nvironmental Lab Director <br />