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1 <br /> 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 Cal Fuels Method EPA 503018015M 8020 <br /> of Northern California Reference Number 3216 Instrument ID Var-GC1 <br /> 4005 North Wilson Way Matrix Water Prepared 9-18-00 <br /> Stockton,CA 95205 Analyst Jim Phillips Analyzed 9-18-00 <br /> Attn Tim Cuellar Reported 9-21-00 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Gasoline MTBE Benzene "toluene Ethyl Benzene Total Xylenes <br /> Spike Concentration 110 208 1 28 772 1 84 924 <br /> Units ug/L ug/L uglL ug/L ug/L ug/L <br /> LCS Batch# v VW-9180 VW-9180 VW-9180 VW-9180 VW-9180 VW-9180 <br /> LCS % Recovery 954% 103% 981% 885% 91 3% 866% <br /> Surrogate Recovery 104% 992% 992% 992% 992% 992% <br /> Control Limits 70-130% 70-130% 70-130% 70-130% 70-130% 70-130% <br /> MS/MSD Batch# VW-9180 VW-9180 VW-9180 VW-9180 VW-9180 VW-9180 <br /> Spike Concentration 110 208 1 28 772 1 84 924 <br /> I MS%Recovery 113% 107% 106% 949% 972% 920% <br /> Surrogate Recovery 103% 992% 992% 992% 992% 992% <br /> F MSD% Recovery 971% 101% 970% 904% 938% 886% <br /> ISurrogate Recovery 102% 982% 982% 982% 982% 982% <br /> Relative%Difference 147% 610% 8 41% 480% 356% 378% <br /> IMethanol Blank ND ND NO NO ND NO <br /> Surrogate Recovery 100% 102% 102% 102% 102% 102% <br /> i 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 MS/MSD's are advisory only and are not used to accept or <br /> reject batch results <br /> 17 <br /> l <br /> ANALYST APPROVED BY <br /> Clan J Cone m s G Phr rps <br /> Environmental Lab Director <br />