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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 /> Advanced GeoE_nvlronmental Inc Client Project ID Sierra Lumber Method EPA 5030/8015M 8020 <br />' of Northern California Reference Number 5839 Instrument ID Var-GC1 <br /> 837 Shaw Road Sample Description Water E=xtracted 06-20-03 <br /> Stockton CA 95215 Analyst .lam Phillips Analyzed 06-20-03 <br /> Attn Tim Cuellar Reported 06-30-03 <br /> 1 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Gasoline MTBE Benzene Toluene Ethyl Benzene Total Xylenes <br /> Spike Concentration 110 2 10 1 32 794 1 84 922 <br />' Units ug/L ug/L ug/L ug/L ug/L ug/L <br /> LCS Batch# VW-6203 VW-6203 VW-6203 VW-6203 VW-6203 VW-6203 <br />' LCS % Recovery 100% 107% 990% 91 5% 101% 959% <br /> Surrogate Recovery 102% 101% 101% 101% 101% 101% <br /> Control Limits 70-130% 70-130% 70-130 % 70-130% 70-130% 70-130% <br />' MS/MSD Batch# VW-6203 VW-6203 VW-6203 VW-6203 VW-6203 VW-6203 <br /> Spike Concentration 110 210 1 32 794 1 84 922 <br />' MS %Recovery 713% 116% 101% 902% 100% 950% <br /> Surrogate Recovery 103% 101% 101% 101% 101% 101% <br /> MSD% Recovery 717% 109% 972% 876% 981% 927% <br /> ISurrogate Recovery 105% 104% 104% 104% 104% 104% <br /> Relative%Difference 0445% 663% 338% 294% 204% 247% <br /> Methanol Blank ND ND ND NO ND NO <br /> Surrogate Recovery 103% 106% 106% 106% 106% 106% <br /> The LCS(Laboratory Check Sample)is a control sample <br /> 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 /> / <br /> I ANALYST U&"a APPROVED 8Y <br /> Clan J Cone James Phillips <br /> Labo tory Director <br />