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i <br /> • CASTLE ANALYTICAL LABORATORY <br /> IEnvironmental Testing Services 2333 Shuttle Drive Atwater, CA 95301 Phone f209) 384 2930 <br /> Certificate #2079 Fax (209) 384-1507 <br /> Advanced GeoEnvironmental, Inc Client Project ID Cal Fuels Method EPA 503018015M,8020 <br /> of Northern California Reference Number 1822 Instrument ID Var GC1 <br /> 4005 North Wilson Way Matrix Water Prepared 11-1 98 <br /> Stockton CA 95205 Analyst Jim Phillips Analyzed 11-1-98 <br /> Am Tim Cuellar Reported 11-3-98 <br />' QUALITY CONTROL DATA REPORT <br /> IANALYTE Gasoline MTBE Benzene Toluene Ethyl Benzene Total Xylenes <br />' Spike Concentration 100 1 00 1 00 1 00 1 00 200 <br /> Units ug/L uglL uglL uglL ug/L uglL <br /> LCS Batch # VG-NO18W VB-NO18W VB N01 8W VB N01 SW VB-N018W VB-NO1 BW <br />�. LCS N. Recovery 106% 105% 97 8% 96 3% 97 8% 91 7% <br /> Surrogate Recovery 102% 100% 100% 100% 100% 100% <br /> Control Limits 70-130 % 70-130 % 70-130 % 70130 % 70-130 % 70 130 % <br /> MS/MSD Batch # VG-NO18W VB-NO18W VB N01 8W VB N01 SW VB-NO18W VB-NO18W <br /> MS % Recovery 107% 102% 103% 103% 102% 97 3% <br /> Surrogate Recovery 66 7% 846% 846% 846% 846% 846% <br /> MSD % Recovery 122% 966% 983% 984% 1010/0 947% <br />' Surrogate Recovery 104% 85 7% 85 7% 85 7% 857% 85 7% <br /> Relative % Difference 13 0% 433% 423% 384% 1 29% 2 59% <br /> Methanol Blank ND ND NO NO ND ND <br /> Surrogate Recovery 942% 94 1% 94 1% 94 1% 94 1% 94 1% <br /> I The LCS (Laboratory Check Samplel 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 /> refect batch results <br /> I <br /> ANALYST APPROVED BY <br /> Clary J CaneJame Phillips <br /> En ronmental Lab Director <br />