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Ile <br /> CASTLE ANALYTICAL LABORATORY <br /> Environmental Testing Seances 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 I=PA 5030/8015M,8020 <br /> of Northern California Reference Number 3849 Instrument ID Var-GC1 <br /> 837 Shaw Road Matrix Water Prepared 6-26-01 <br /> Stockton CA 95215 Analyst Jim Phillips Analyzed 6-26-01 <br /> Attn Tim Cuellar Reported 7-5-01 <br /> r <br />' QUALITY CONTROL DATA REPORT <br /> ANALYTE Gasoline MTBE Benzene Toluene Ethyl Benzene Total Xylenes <br />' Spike Concentration 110 2 08 1 28 772 1 84 924 <br /> Units uglL ug/L ug1L uglL uglL ug1L <br />' LCS Batch# VW-6261 VW-6261 VW-6261 VW-6261 VW-6261 VW-6261 <br /> LCS % Recovery 132% 101% 969% 105% 112% 115% <br /> Surrogate Recovery 108% 103% 103% 103% 103% 103% <br /> 10) Control Limits 70-130% 70-130% 70-130 % 70-130% 70-130% 70-130% <br />' MS/MSD Batch# VW-6261 VW-6261 VW-6261 VW-6261 VW-6261 VW-6261 <br /> Spike Concentration 110 2 06 1 28 7 72 184 924 <br />' MS% Recovery 109% 638% 809% 109% 118% 120% <br /> Surrogate Recovery 113% 112% 112% 112% 112% 112% <br /> MSD% Recovery 116% 629% 840% 111% 120% 122% <br />' Surrogate Recovery 116% 113% 113% 113% 113% 113% <br /> Relative% Difference 575% 1 09% 366% 159% 212% 1 98% <br />' Methanol Blank ND ND ND ND ND ND <br /> Surrogate Recovery 991% 104% 104% 104% 104% 104% <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 MSIMSD's are advisory only and are not used to accept or <br /> reject batch results <br /> r <br />' ANALYST APPROVED BY <br /> &Z <br /> Clan J Cone J es C Phi Ips <br /> Laboratory Director <br />