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CASTLE ANALYTICAL LABORATORY <br /> I Environmental Testing Services 2333 Shuttle Drive, Atwater, CA 95301 Phone (209) 384-2930 <br /> Certificate #2079 Fax (209) 384-1507 <br /> Advanced GeoEnvuonmental, Inc Client Project ID Flag City Chevron Method EPA 503018015M,8020 <br /> of Northern California Reference Number 1655 Instrument ID Var-GC1 <br /> 4005 North Wilson Way Matrix Sod Prepared 7-2-98 <br /> Stockton, CA 95205 Analyst Clan Cone Analyzed 7-2-98 <br />' Attn Tim Cuellar Reported 7-8-98 <br /> IQUALITY 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-7028 VB-7028 VB-7028 VB-7028 VB-7028 VB-7028 <br /> ILCS % Recovery 112% 948% 108% 108% 106% 114% <br /> Surrogate Recovery 103% 977% 977% 977% 97 7% 977% <br /> Control Limits 70-130 % 70-130 % 70-130 % 70-130 % 70-130 % 70-130 % <br /> MS/MSD Batch # VG-7028 VB-7028 VS-7028 VB-7028 VB-7028 VB-7028 <br /> IMS % Recovery 897% 81 3% 873% 85 1% 85 6% 863% <br /> Surrogate Recovery 87 8% 858% 85 8% 868% 85 8% 858% <br /> MSD % Recovery 875% 62 3% 847% 82 5% 826% 827% <br /> Surrogate Recovery 86 1% 844% 844% 844% 844% 844% <br /> I Relative % DEfference 2 52% 171% 297% 291% 347% 4 10% <br /> Methanol Blank ND ND ND ND ND ND <br /> Surrogate Recovery 968% 974% 97 4% 974% 974% 974% <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 /> I <br /> ANALYST APPROVED BY <br /> Clary J Canees C Phillips <br /> Environmental Lab Director <br /> I <br />