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• CASTLE ANALYTICAL LABORATORY <br /> Environmental Testing Services 2333 Shuttle Drive, Atwater, CA 95301 Phone (209) 384-2930 <br /> Certificate #2079 Fax 1209) 384-1507 <br />' Advanced GeoEnvironmental, Inc Client Project ID CAL Fuels Method EPA 5030/8015M,8020 <br /> of Northern California Reference Number 1662 Instrument ID Var-GC1 <br /> 4005 North Wilson Way Matrix Soil Prepared 7-7-98 <br /> Stockton, CA 95205 Analyst Clan Cone Analyzed 7-9-98 <br /> Attn Tim Cuellar Reported 7-16-98 <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-7078 VB-7078 VB-7078 VB-7078 VB-7078 VS-7078 <br /> LCS % Recovery 101% 105% 115% 122% 105% 113% <br /> Surrogate Recovery 105% 970% 970% 970% 970% 970% <br /> lieControl Limits 70-130 % 70-130 % 70-130 % 70-130 % 70-130 % 70-130 % <br /> MS/MSD Batch # VG-7078 VB-7078 VB-7078 VB-7078 VB-7078 VB-7078 <br /> MS % Recovery 695% 119% 734% 738% 722% 728% <br /> Surrogate Recovery 878% 703% 703% 703% 703% 703% <br /> MSD % Recovery 61 1% 89 8% 714% 71 5% 694% 702% <br /> Surrogate Recovery 69 1% 690% 690% 690% 690% 690% <br /> Relative % Difference 129% 27 7% 263% 2 96% 389% 3 52% <br /> Methanol Blank ND ND ND ND ND ND <br /> Surrogate Recovery 97 9% 983% 983% 983% 983% 983% <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 tha camp rPanrintg nrpnaratinn and analvtiral mpthnrk pmninvpei fnr thee gammas The L C'S % rprovery is ti4pd 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 /> Carr J ne gine C 11l1 S <br /> Environmental Lab Director <br />