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l <br />' CASTLE ANALYTICAL LABORATORY <br /> iEnvironmental Testing Services 2333 Shuttle Drive,Atwater,CA 95301 Phone (209)384-2930 <br />' Certificate#2480 Fax (209)384-1507 <br /> Geo-Phase Environmental Client Project ID Mana Pro-Stockton Method EPA 5030/8015M,8020 <br />' 2973 Veneman Ave B-240 Reference Number 8578 instrument ID Var-GC1 <br /> Modesto CA 95356 Sample Description Water Extracted 09-21-05 <br /> Attn Steve Lankford Analyst Jim Phillips Analyzed 09-21-05 <br /> Reported 09-28-05 <br /> QUALITY CONTROL DATA REPORT <br /> 1 <br /> ANALYTE Gasoline MTBE Benzene Toluene Ethyl Benzene Total Xylenes <br /> Spike Concentration 110 216 1 34 758 1 82 888 <br />' Units ug/L ug/L ug/L ug/L ug/L ug/L <br /> LCS Batch# VW-9215 VW-9215 VW-9215 VW-9215 VW-9215 VW-9215 <br />' LCS%Recovery 882% 875% 947% 109% 118% 120% <br /> Surrogate Recovery 104% 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-9215 VW-9215 VW-9215 VW-9215 VW-9215 VW-9215 <br />' Spike Concentration 110 216 1 34 7 58 1 82 888 <br /> MS%Recovery 887% 919% 864% 110% 121% 123% <br />' Surrogate Recovery 111% 112% 112% 112% 112% 112% <br /> MSD%Recovery 870% 996% 867% 109% 119% 121% <br /> Surrogate Recovery 109% 110% 110% 110% 110% 110% <br />' Relative%Difference 172% 707% 0287% 148% 168% 200% <br /> Method Blank ND ND ND ND ND ND <br /> Surrogate Recovery 963% 993% 993% 993% 993% 993% <br /> rThe 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 MSIMSD's are advisory only and are not used to accept or <br /> refect batch results <br /> r <br /> APPROVED BY t(A <br /> Jame C Phrllrp /M&5ratory Director or <br /> Clan J Cone/L I <br /> boratory Manager <br /> r <br />