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1 <br />' 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 GeoEnvironmental, Inc Client Project ID Joe's Truck Stop Method EPA 503018015M,8020 <br />' of Northern California Reference Number 990 Instrument ID Var-GC1 <br /> 1803 West March Lane, Suite A Matrix Soil Prepared 1 16-97 <br /> Stockton, CA 95207 Analyst Jim Phillips Analyzed 1-16-97 <br />' Attn Kevin McKibben Reported 1-17-97 <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 ug/kg ug/kg ug/kg ug/kg ug/kg <br /> LCS Batch # VG-1167 VB-1167 VB-1167 VB 1167 VB-1167 VB-1167 <br />' LCS % Recovery 100% 976% 107% 107% 106% 106% <br /> Surrogate Recovery 1 1 1% 1112% 1 12% 112% 112% 112% <br /> Control Limits 70 130 % 70-130 % 70 130 % 70-130 % 70-130 % 70-130 % <br />' MS/MSD Batch # VG 1167 VS 1 167 VB-1 167 VB-1 167 VB-1167 VB 1 167 <br />' MS % Recovery 564% 83 2% 704% 698% 72 6% 75 2% <br /> Surrogate Recovery 836% 802% 80 2% 802% 802% 802% <br /> MSD % Recovery 77 2% 890% 754% 742% 75 8% 75 7% <br />' Surrogate Recovery 845% 824% 824% 824% 82 4% 824% <br /> Relative % Difference 27 8% 6 74% 686% 594% 438% 0585% <br />' Methanol Blank ND ND ND ND ND ND <br /> Surrogate Recovery 113% 113% 113% 113% 113% 113% <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 MSIMSD's are advisory only and are not used to accept or <br /> reject batch results <br /> 1 <br /> ANALYST APPROVED BY <br />' Qxw- <br /> Clan J Cone Ja es C Phillips <br /> Environmental Lab Director <br /> 1 <br /> 1 <br />