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i f <br /> ' 1 <br /> i' <br /> CASTLE ANALYTICAL LABORATORY ' - <br /> Environmental <br /> ABORATORY -Environmental Testing Services 2333 Shuttle Drive, Atwater, CA 95301 t Phone (209) 384-2930 <br /> Certificate #2079 Fax (209) 384-1507 <br />' Advanced GeoEnvironmental, Inc Client Project ID Flag City Chevron Method EPA 5030/8015M,8020 <br /> of Northern California Reference Number 2298 = Instrument ID Var-GC1 <br /> 4005 North Wilson Way Matrix Water Prepared 6-4-99 <br /> Stockton CA 95205 Analyst Jim Phillips y Analyzed 6.4-99 ti , <br /> Attn Tim Cuellar r Reported 6-15-99 <br /> r, <br /> , <br /> QUALITY CONTROL DATA REPORT <br /> y <br /> I <br /> t <br /> ANALYTE Gasoline MTBE Benzene Toluene Ethyl Benzene Total Xylenes <br /> s <br /> Spike Concentration 110 222 1 34 7 82 1 84 r 948 ; <br /> Units ug/L ug/L ug/L ug/L ug/L ug/L <br /> LCS Batch # VW 6049 VW 6049 VW-6049 VW-6049 VW-6049 VW-6049 <br /> LCS % Recovery 111% 110% 10761. 980% 104% 91 1% ' <br /> .Surrogate Recovery 105% 101% 101% 101% 101%. 101% <br /> Control Limits 70 130 % 70-130 % 70-130 % 70 130 % 70-130 % 70-130 % <br /> f <br /> MS/MSD Batch # VW-6049 VW 6049 VW-6049 VW 6049 VW 6049 VW-6049 ` <br /> Spike Concentration 110 222 1 34 7 82 1 84 948 <br /> MS % Recovery 994% t 76 1% 984% '102% f' 106% - 93 3% <br /> Surrogate Recovery 106% 104% 104% 104% 104% , 104% <br /> MSD % Recovery 103% 703% 102%102% `102% n 1,05°/°, 93 1% <br /> Surrogate Recovery ti 105,% 103% 103% 103% 103% 103% ' <br /> Relative % Difference 4 345% 2 77% 3 55% 0366% 0414% 0225% <br /> I , <br /> r 4 <br /> ` Methanol Blank ND I ND _ r ND ND ND ND , <br /> Surrogate Recovery '101% 101% 101% 101% 101% 101% <br /> The LCS (Laboratory Check Sample) is a control sample of known interferent free matrix that is fortified with representative analytes and <br /> I 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 /> , I <br /> refect batch results <br /> 3 <br /> ANALYST APPROVED BY <br /> Clair one / James C Phillips <br /> �rEn'tronmental Lab Director <br />