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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 Protect ID Top Filling Method EPA 503018015M,8020 <br /> of Northern California Reference Number 2943 Instrument ID Var-GC1 <br /> 4005 North Wilson Way Matrix Water Prepared 4-5-00 <br /> Stockton CA 95205 Analyst Jim Phillips Analyzed 4-5-00 <br /> Attn Tim Cuellar Reported 4-11-00 <br /> QUALITY CONTROL DATA REPORT <br /> IANALYTE Gasoline MTBE Benzene Toluene Ethyl Benzene Total Xylenes <br /> ISpike Concentration 110 222 1 34 7 82 1 84 948 <br /> Units ug/L ug/L ug/L ug/L ug/L ug/L <br />' LCS Batch# VW-4050 VW-4050 VW-4050 VW-4050 VW-4050 VW-4050 <br /> LCS % Recovery 117% 139% 927% 929% 970% 91 3% <br /> Surrogate Recovery 103% 914% 9114% 114% 994% 914% <br /> Control Limits 70-130% 70-130% 70-130% 70-130% 70-130% 70-130% <br /> MS/MSD Batch# VW-4050 VW-4050 VW-4050 VW-4050 VW-4050 VW-4050 <br /> Spike Concentration 110 222 1 34 782 1 84 948 <br /> I MS % Recovery 104% 140% 820% 901% 909% 865% <br /> Surrogate Recovery 101% 983% 983% 983% 983% 983% <br /> MSD%Recovery 100% 140% 825% 894% 905% 854% <br /> Surrogate Recovery 102% 970% 970% 970% 970% 970% <br /> Relative%Difference 334% 0539% 0480% 0793% 0388% 1 18% <br />' Methanol Blank ND ND ND ND ND ND <br /> Surrogate Recovery 107% 101% 101% 101% 101% 101% <br /> I <br /> The LCS (Laboratory Check Sample)is a control sample of known, interferent free matrix that is fortified with representative analytes and <br /> I analyzed using the same reagents preparation and analytical methods employed for the samples The LCS 0Xa 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 of <br /> refect batch results <br /> ANALYST �1.� APPROVED / f <br /> Clan J Cone a es C Phr! ps ' <br /> Environmental Lab Director <br />