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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 Flag City Chevron Method EPA 5030/8015M,8020 <br /> I of Northern California Reference Number 2090 Instrument ID Var-GC1 <br /> 4005 North Wilson Way Matrix Water Prepared 3-3-99 <br /> Stockton, CA 95205 Analyst Jim Phillips Analyzed 3-3-99 <br /> Attn Tim Cuellar Reported 3-10-99 <br /> QUALITY CONTROL DATA REPORT <br /> I <br /> ANALYTE Gasoline MTBE Benzene Toluene Ethyl Benzene Total Xylenes <br /> Spike Concentration 110 222 1 34 7 82 1 84 948 <br />' Units ug/L ug/L ug/L ug/L ug/L ug/L <br /> LCS Batch # VW-3039 VW-3039 VW-3039 VW-3039 VW-3039 VW-3039 <br /> LCS % Recovery 108% 114% 112% 100% 103% 931% <br /> Surrogate Recovery 103% 993% 99 3% 99 3% 99 3% 993% <br /> Control Limits 70-130 % 70-130 % 70-130 % 70-130 % 70-130 % 70-130 % <br /> I MS/MSD Balch # VW-3039 VW-3039 VW-3039 VW-3039 VW-3039 VW-3039 <br /> MS % Recovery 1010/0 157% 112% 101% 105% 945% <br /> Surrogate Recovery 116% 106% 106% 106% 106% 106% <br /> MSD % Recovery 93 9% 99 7% 107% 973% 102% 910% <br /> Surrogate Recovery 113% 103% 103% 103% 103% 103% <br /> IRelative % Difference 7 12% 35 9% 384% 3 56% 2 64% 365% <br /> Methanol Blank ND ND ND ND ND ND <br /> Surrogate Recovery 103% 103% 103% 103% 103% 103% <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 /> I of sample batch results Due to matrix effects, the CIC limits and recoveries for MSIMSD's are advisory only and are not used to accept or <br /> reject batch results <br /> 1 it <br /> ANALYST / APPROVED BY <br /> Clary J Cone Ja s C Phillips <br /> nvironmental Lab Director <br /> I <br />