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1 <br /> Ile CASTLE ANALYTICAL LABORATORY <br />' Environmental Testing Services 2333 $huttle Drive, Atwater, CA 95301 Phone (209) 384-2930 <br /> Certificate #2079 Fax (209) 384-1507 <br /> FBSK Analytical Laboratories Client Project ID 9901/588 Method EPA 5030/8015M,8020 <br />' 1414 Stanislaus Street Reference Number 2036 Instrument ID Var-GC1 <br /> Fresno, CA 93706 Matrix Water Prepared 2-7-99 <br /> Attn Sample Receiving Analyst Jim Phillips Analyzed 2-7-99 <br />' Reported 2-15-99 <br />' QUALITY CONTROL DATA REPORT <br />' ANALYTE Gasoline MTBE Benzene Toluene Ethyl Benzene Total Xylenes + <br />' Spike Concentration 110 2 22 1 34 7 82 1 84 9 48 <br /> Units ug/L ug/L ug/L ug/L ug/L ug/L <br />' LCS Batch # VW 2079 VW-2079 VW 2079 VW-2079 VW-2079 VW-2079 <br /> LCS % Recovery 130% 112% 110% 109% 115% 105% <br /> Surrogate Recovery 116% 112% 112% 112% 112% 112% <br /> IControl Limits 70 130 % 70130 % 70-130 % 70-130 % 70-130 % 70-130 % <br />' MSIMSD Batch # VW-2079 VW-2079 VW-2079 VW 2079 VW-2079 VW-2079 <br /> MS % Recovery 103% 108% 934% 103% 110% 982% <br /> Surrogate Recovery 106% 103% 103% 103% 103% 103% <br /> MSD °/6 Recovery 103% 119% 90 7% 100% 107% 949% <br /> Surrogate Recovery 105% 102% 102°x6 102% 102% 102% <br /> Relative % Difference 00190% 937% 2 70% 240% 232% 336% <br /> Methanol Blank ND ND ND ND ND ND <br /> Surrogate Recovery 69 0% 89 0% 890% 89 0% 890% 89 0% <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 accept or <br /> reject batch results <br /> ANALYST APPROVED BY <br /> Clan J Cone am C Phillips <br /> Environmental Lab Director <br />