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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 GeoEnwronmental,Inc Client Protect ID Pacific Pride-EI Dorado Method EPA 5030/8015M,8020 <br /> of Northern California Reference Number 2894 Instrument E0 Var-GC1 <br /> 4005 North Wilson Way Matrix Water Prepared 3-17-00 <br /> Stockton CA 95205 Analyst Jim Phillips Analyzed 3-17-00 <br /> Attn Tim Cuellar Reported 3-27-00 <br /> ' QUALITY CONTROL DATA REPORT <br /> ' ANALYTE Gasoline MTBE Benzene Toluene Ethyl Benzene Total Xylenes <br /> ' Spike Concentration 110 222 1 34 7 82 1 84 948 <br /> Units ug/L uglL uglL uglL uglL uglL <br /> LCS Batch# VW-3170 VW-3170 VW-3170 VW-3170 VW-3170 VW-3170 <br /> LCS %Recovery 135% 107% 116% 103% 108% 959% <br /> ,Surrogate Recovery 103% 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-3170 VW-3170 VW-3170 VW-3170 VW-3170 VW-3170 <br /> Spike Concentration 110 222 134 7 82 1 84 948 <br /> ' MS%Recovery 135% 106% 964% 936% 100% 883% <br /> Surrogate Recovery 102% 101% 10`1% 101% 101% 101% <br /> MSD%Recovery 147% 107% 105% 959% 102% 897% <br /> Surrogate Recovery 101% 101% 101% 101% 101% 101% <br /> Relative%Difference 716% 0865% 352% 142% 124% 0966% <br /> Methanol Blank NO NO NO NO ND NO <br /> Surrogate Recovery 937% 951% 951% 951% 951% 951% <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 OC limits and recoveries for MSIMSD's are advisory only and are not used to acceptor <br /> reject batch results <br /> 1 I <br /> ANALYST APPROVED BY <br /> Clan J Cone Ja es C Phillips <br /> Environmental Lab Director <br />