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T <br /> r <br /> r <br /> CASTLE ANALYTICAL LABORATORY <br /> r Environmental Testing Services 2333 Shuttle Drive,Atwater, CA 95301 Phone (209)384-2930 <br /> Certificate#1-2480 Fax (209)384-1507 <br />' Advanced GeoEnvironmental, Inc Client Project 1D Top Filling Method EPA 5030/8015M,8020 <br /> of Northern California Reference Number 4275 Instrument ID Var-GC1 <br /> 837 Shaw Road Sample Description Water Prepared 12-13-01 <br /> Stockton, CA 95215 Analyst Jim Phillips Analyzed 12-13-01 <br />' Attn Tim Cuellar Reported 12-23-01 <br />' QUALITY CONTROL.DATA REPORT <br />' ANALYTE Gasoline MTBE Benzene Toluene Ethyl Benzene Total Xylenes <br />' Spike Concentration 110 210 1 32 794 1 84 922 <br /> Units ug/L ug/L ug/L ug/L ug/L ug/L <br />' LCS Batch# VW-D131 VW-0131 VW-D131 VW-D131 VW-0131 VW-D131 <br /> 902% 165% 127% 109% 115% 112% <br /> lieSurrogate Recovery 104% 100% 100% 100% 100% 100% <br /> Control Limits 70-130% 70-130% 70-130% 70-130% 70-130% 70-130% <br />' MS/MSD Batch# VW-D131 VW-D131 VW-D131 VW-0131 VW-D131 VW-D131 <br /> Spike Concentration 110 210 1 32 7 94 1 84 922 <br />' MS%Recovery 75% 128% 122% 112% 120% 116% <br /> Surrogate Recovery 106% 102% 102% 102% 102% 102% <br /> 1 MSD% Recovery 980% 129% 133% 114% 122% 117% <br /> Surrogate Recovery 109% 106% 106% 106% 106% 106% <br /> Relative%Difference 268% 1 10% 847% 174% 1 31% 09300/6 <br />' Methanol Blank NO NO ND ND NO NO <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 anaiytes 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 />' ANALYST APPROVED BY f <br /> Clan J Cane Jam C Phillips <br />' oratory Director <br />