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CASTLE ANALYTICAL LABORATORY <br /> Environmental Testing Services 2333 Shuttle Drive Atwater CA 95301 Phone (209)384-2930 <br /> Certificate#2480 Fax (209)384-1507 <br /> I Advanced GeoEnvironmental Inc Client Protect ID Nomelhm Method EPA 5030180115M,8020 <br /> of Northern California Reference Number 7172 Instrument ID Var-GC1 <br /> 837 Shaw Road Sample Description Water Extracted 07-23-04 <br /> Stockton CA 95215 Analyst Jim Phillips Analyzed 07-23-04 <br /> IAttn Tim Cuellar Reported 08-02-04 <br /> QUALITY CONTROL DATA REPORT <br /> IANALYTE Gasoline MTBE Benzene Toluene Ethyl Benzene Total Xylenes <br /> Spike Concentration 110 2 10 1 32 794 1 84 922 <br /> Units uglL uglL uglL uglL uglL ug1L <br /> ILCS Batch# VW-7234 VW-7234 VW-7234 VW-7234 VW-7234 VW-7234 <br /> LCS % Recovery 877% 934% 829% 861% 938% 920% <br /> Surrogate Recovery 116% 109% 109% 109% 109% 109% <br /> Control Limits 70-130% 70-130% 70-130% 70-130% 70-130% 70-130% <br />' MS/MSD Batch# VW-7234 VW-7234 VW-7234 VW-7234 VW-7234 VW-7234 <br /> Spike Concentration 110 2 10 1 32 794 1 84 922 <br /> MS % Recovery 849% 893% 863% 91 3% 101% 996% <br /> Surrogate Recovery 126% 120% 120% 120% 120% 120% <br /> I MSD% Recovery 11811% 91 1% 11111% 901% 101% 91111% <br /> Surrogate Recovery 125% 119% 119% 119% 119% 119% <br /> Relative% Difference 440% 1 84% 293% 0491% 0188% 0857% <br /> IMethod Blank ND ND ND ND ND ND <br /> Surrogate Recovery 111% 107% 107% 107% 107% 107% <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% 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 /> ANALYST APPROVED BY <br /> Clair one <br /> Jamo C Phillips <br /> La oratory Director <br />