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1 <br />' <br /> CASTLE ANALYTICAL LABORATORY <br />' Environmental Testing Services P 0 Box 1360, Winton CA 95388 Phone 1209) 364-2930 <br /> Fax (209) 384-1507 <br /> Advanced Geo Environmental, Inc Client Project ID Cal Fuels Method EPA 5030/8015 <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 mglkg ug/kg uglkg ug/kg uglkg ug/kg <br /> LCS Batch # VG D276 VB D276 VB-D276 VB D276 VB D276 VB D276 <br />' LCS % Recovery 115% 97 80/0 120% 115% 109% 116% <br /> Surrogate Recovery NA 99 2% 99 2% 99 2% 99 2% 99 2% <br /> lie Control Limits 70 130 % 70 130 % 70-130 % 70-130 % 70 130 % 70-130 % <br /> MS/MSD Batch # VG D276 V6 D276 VB D276 VB D276 VB D276 VB D276 <br />' MS % Recovery 63 8% 74 8% 808% 79 8% 73 5% 742% <br /> Surrogate Recovery NA 71 1% 71 1% 71 1% 71 1% 71 1% <br /> MSD % Recovery 660% 98 8% 75 0% 72 5% 75 3% 829% <br /> Surrogate Recovery 76 2% 709% 709% 709% 709% 709% <br /> Relative % Difference 3 27% 243%, 7 45% 8 88% 2 32% 9 83% <br />' Methanol Blank ND ND ND ND ND ND <br /> Surrogate Recovery 100% 100% 100% 100% 1000/0 100% <br /> Please Note <br /> The LCS (Laboratory Check Sample) �s 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 OC limas and recoveries for MSIMSD s are aavisory only ano are not used w accept 01 <br /> reject batch results <br /> �J \ <br /> ' ANALYST APPROVED BY y <br /> Clary J Cone Ja hfllrps` <br /> nvrranrnentaJ Lab Director <br /> 1 <br />