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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 5030/8015M,8020 <br /> of Northern California Reference Number 2535 Instrument ID Var-GC1 <br /> 4005 North Wilson Way Matrix Water Prepared 10-2099 <br /> Stockton, CA 95205 Analyst .aim Phillips Analyzed 10-2099 <br />' Attn Tim Cuellar Reported 10-22 99 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Gasoline MTBE Benzene Toluene Ethyl Benzene Total Xylenes <br /> Spike Concentration 110 222 1 34 782 1 84 948 <br /> Units ug/L ug/L ug/L ug/L ug/L uglL <br /> LCS Batch # VW-0209 VW-0209 VW-0209 VW-0209 VW-0209 VW-0209 <br /> LCS % Recovery 108% 73 2% 999% 97 1% 102% 905% <br /> Surrogate Recovery 107% 104% 104% 104% 104% 104% <br /> Control Limits 70-130 % 70-130 % 70 130 % 70-130 % 70-130 % 70 130 % <br /> MSlMSD Batch # VW-0209 VW-0209 VW-0209 VW-0209 VW 0209 VW 0209 <br /> Spike Concentration 110 2 22 1 34 7 82 1 84 948 <br />' IVIS % Recovery 103% 110% 964% 967% 970% 884% <br /> Surrogate Recovery 104% 102% 102% 102% 102% 102% <br />' MSD % Recovery 102% 105% 983% 963% 97 0% 880% <br /> Surrogate Recovery 107% 104% 104% 104% 104% 104% <br /> Relative % Difference 0806% 4 46o/a 1 88% 0356% 0 0161% 0442% <br /> I <br /> Methanol Blank ND ND ND ND ND ND <br /> Surrogate Recovery 99 1% 102% 102% 102% 102% 102% <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 />' 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 MS/MSD s are advisory only and are not used to accept or <br /> reject batch results <br /> 1 <br /> ANALYST APPROVED BY <br /> Clary J Cone J es C hrNtps <br /> nvrronmental Lab Director <br /> 1 <br />