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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 (209) 384-1507 <br /> Advanced GeoEnvironmental, Inc Client Project ID Nomellini Method EPA 5030/8015M,8020 <br /> of Northern California Reference Number 2162 Instrument ID Var-GC1 <br /> 4005 North Wilson Way Matrix Water Prepared 4-1-99 <br /> Stockton, CA 95205 Analyst Jim Phillips Analyzed 4-1-99 <br /> Attn Tim Cuellar Reported 4-13-99 <br /> I <br /> QUALITY CONTROL DATA REPORT <br />' ANALYTE Gasoline MTBE Benzene Toluene Ethyl Benzene Total Xylenes <br /> Spike Concentration 110 222 1 34 7 82 1 84 9 48 <br />' Units ug/L ug/L ug/L ug/L ug/L ug/L <br /> LCS Batch # VW-4019 VW 4019 VW-4019 VW-4019 VW-4019 VW-4019 <br />' LCS % Recovery 102% 116% 108% 101% 104% 92 9% <br /> Surrogate Recovery 103% 101% 101% 101% 101% 101% <br /> Control Limits 70-130 % 70130 % 70-130 % 70-130 % 70-130 % 70130 % <br />' MS/MSD Batch # VW-4019 VW 4019 VW-4019 VW-4019 VW-4019 VW-4019 <br /> Spike Concentration 110 222 1 34 782 1 84 9 48 <br />' MS % Recovery 984% 848% 110% 98 5% 103% 91 8% <br /> Surrogate Recovery 106% 102% 102% 102% 102% 102% <br /> MSD % Recovery 985% 839% 109% 986% 103% 92 2% <br />' Surrogate Recovery 1050/0 102% 102% 102% 102% 102% <br /> Relative % Difference 0 0931% 103% 1 19% 00869% 00469% 0442% <br />' Methanol Blank ND ND ND ND ND ND <br /> Surrogate Recovery 923% 929% 92 9% 92 9% 929% 92 9% <br /> 1 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 /> ANALYST APPROVED BY ` <br /> C J Cone Wesrlhps <br /> al Lab Director <br />