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i <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 /> I Advanced GeoEnvironmental, Inc Client Project ID Comfort Air Method EPA 503018015M,8020 <br /> of Northern California Reference Number 3288 Instrument ID Var-GC1 <br /> 4005 North Wilson Way Matrix Sod Prepared 11-1-00 <br />' Stockton, CA 95205 Analyst Clan Cone Analyzed 11-1-00 <br /> Attn Paul Dotson Reported 11-7-00 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Gasoline MTBE Benzene Toluene Ethyl Benzene Total Xylenes <br /> Spike Concentration 220 41 6 256 154 368 185 <br /> Units mg/kg ug/kg ug/kg ug/kg ug/kg ug/kg <br /> 'L <br /> Batch# VS-N010A VS-N010A VS-N010A VS-N010A VS-NO10A VS-N010A <br /> LCS 4 Recovery 971% 768% 115% 104% 102% 100% <br /> Surrogate Recovery 104% 103% 103% 103% 103% 103% <br />�. Control Limits 70-130% 70-130% 70-130% 70-130% 70-130% 70-130% <br /> I MS/MSD Batch# VS-N010A VS-NO10A VS-N010A VS-N010A VS-N01 OA VS-NO10A <br /> MS%Recovery 643% 802% 733% 753% 758% 737% <br /> Surrogate Recovery 811% 791% 791% 791% 791% 791% <br />' MSD% Recovery 639% 770% 750% 743% 749% 728% <br /> Surrogate Recovery 789% 776% 776% 776% 776% 776% <br />' Relative%Difference 0622% 407% 210% 130% 1 11% 115% <br /> Methanol Blank ND ND ND ND ND ND <br /> Surrogate Recovery 100% 103% 103% 103% 103% 103% <br /> 1 <br />' Please Note <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 QC limits and recoveries for MS/MSD's are advisory only and are not used to accept or <br />' reject batch results <br /> IANALYST 66"t/— APPROVEDW Clan J Cone rrpsal Lata Director <br /> I <br />