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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 /> California Geophysical Chent Project ID Beneto#8 Method EPA 5030/8015M,8020 <br /> P O Box 578341 Reference Number 8341 Instrument ID Var-GC1 <br /> Modesto CA 95357 Sample Description Water Extracted 07-15-05 <br /> Attn John Cussen Analyst Jim Phillips Analyzed 07-15-05 <br /> Reported 07-21-05 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Gasoline MTBE Benzene Toluene Ethyl Benzene Total Xylenes <br /> Spike Concentration 110 2 16 1 34 758 1 82 8 88 <br />' Units uglL ug/L ug/L ug/L ug/L ug/L <br /> LCS Batch# VW-7155 VW-7155 VW-7155 VW 7155 VW-7155 VW-7155 <br />' LCS% Recovery 915% 940% 943% 933% 952% 976% <br /> Surrogate Recovery 105% 103% 103% 103% 103% 103% <br />' Control Limits 70-130% 70-130% 70-130% 70-130% 70-130% 70-130% <br /> MS/MSD Batch# VW-7155 VW-7155 VW-7155 VW-7155 VW-7155 VW-7155 <br />' Spike Concentration 110 2 16 134 758 1 82 888 <br /> MS %Recovery 884% 805% 101% 104% 105% 105% <br />' Surrogate Recovery 111% 108% 108% 108% 108% 108% <br /> MSD% Recovery 851% 102% 100% 102% 104% 104% <br /> Surrogate Recovery 109% 107% 107% 107% 107% 107% <br /> Relative% Difference 357% 235% 0828% 1 85% 0959% 0707% <br /> Method Blank ND ND ND ND ND ND <br /> Surrogate Recovery 103% 104% 104% 104% 104% 104% <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 QC limits and recoveries for MS/MSD's are advisory only and are not used to accept or <br /> reject batch results <br /> APPROVED BYAPPROVED BY <br /> Clan J <br /> Gone7a—"—'sY,7Phdhps <br /> Laboratory Manage boratory Director <br /> I <br />