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i <br /> lie 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 California Fuels Method EPA 5030/8015M,8020 <br /> of Northern California Reference Number 3017 Instrument ID Var-GC1 <br /> 4005 North Wilson Way Matrix Water Prepared 6-2-00 <br /> Stockton,CA 95205 Analyst Jim Phillips Analyzed 6-2-00 <br /> Attn Tim Cuellar Reported 6-8-00 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Gasoline MTBE Benzene Toluene Ethyl Benzene Total Xylenes <br /> Spike Concentration 110 2 22 1 34 7 82 1 84 948 <br /> Units ug/L ug/L ug/L ug/L ug/L ug/L <br /> I LCS Batch# VW-6020 VW-6020 VW-6020 VW-6020 VW-6020 VW-6020 <br /> LCS % Recovery 886% 91 4% 109% 900% 950% 880% <br /> • Surrogate Recovery 105% 109% 109% 109% 109% 109% <br />' Control Limits 70-130% 70-130% 70-130% 70-130% 70-130% 70--130% <br /> MSIMSD Batch# VW-6020 VW-6020 VW-6020 VW-6020 VW-6020 VW-6020 <br /> Spike Concentration 110 2 22 1 34 7 82 1 84 948 <br /> I MS%Recovery 974% 273% 921% 861% 902% 842% <br /> Surrogate Recovery 114% 108% 108% 108% 108% 108% <br /> MSD% Recovery 100% 184% 938% 880% 92 1% 870% <br /> ISurrogate Recovery 109% 108% 108% 108% 108% 108% <br /> Relative% Difference 7 81% 233% 3 31% 349% 252% 282% <br /> Methanol Blank ND ND ND ND ND ND <br /> Surrogate Recovery 102% 101% 101% 101% 101% 101% <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 OC limits and recoveries for MS/MSD's are advisory only and are not used to accept or <br /> reject batch results <br /> ANALYST APPROVED BY <br /> Clan J Cone Jame C hullps <br /> E rronmental Lab Drrector <br />