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lie <br /> CASTLE ANALYTICAL LABORATORY <br /> Env,ronmental Testing Services 2333 Shuttle Drive Atwater, CA 95301 Phone 1209) 384 2930 <br />' Certificate #2079 Fax 1209) 384-1507 <br /> Advanced Geo Environmental, Inc Client Project ID Pacific Car Wash Method EPA 5030/8015M 8020 <br /> of Northern California Reference Number 2534 Instrument ID Var GC1 <br /> 4005 North Wilson Way Matrix Water Prepared 10-20-99 <br /> Stockton, CA 95205 Analyst Jim Phillips Analyzed 10-20 99 <br /> Attn Tim Cuellar Reported 10-22 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 84 948 <br /> Units ug1L ug/L ug/L ug1L ug/L uglL <br />' LCS Batch # VW 0189 VW 0189 VW-0189 VW-0189 VW 0189 VW-0189 <br /> LCS % Recovery 101% 112% 126% 104% 112% 984% <br /> Recovery 109% 106% 106% 106% 106% 106% <br />,,,Surrogate <br /> Control Limits 70 130 % 70 130 % 70 130 % 70 130 % 70 130 % 70-130 % <br />' MS/MSD Batch # VW 0189 VW 0189 VW 0189 VW 0189 VW 0189 VW-0189 <br /> Spike Concentration 110 2 22 1 34 7 82 1 84 948 <br /> MIS % Recovery 106% 120% 112% 102% 106% 96 3% <br />' Surrogate Recovery 108% 106% 106% 106% 106% 106% <br />' MSD % Recovery 113% 143% 118% 98 8% 103% 934% <br /> Surrogate Recovery 106% 103% 103% 103% 103% 103% <br /> Relative % Difference 6 48% 174% 5 74% 2 65% 2 84% 2 99% <br />' Methanol Blank NO ND ND ND NO NO <br /> Surrogate Recovery 99 1% 102% 102% 102% 102% 102% <br /> I <br /> The LCS (Laboratory Check Sample) is a control sample of known, interferent free matrix that is fortified with representative analytes and <br /> analyzed usmg the same reagents, preparation and analytical methods employed for the samples The LCS IN, recovery is used for validation <br />' of sample batch results Due to matrix effects the QC kmits and recoveries for MS/MSD s are advisory only and are not used to accept or <br /> reject batch results <br /> 1 <br /> i <br />' ANALYST APPROVED BY <br /> _Yd�iTY-Xz <br /> Clary J Cone Jam Phillips <br /> vironmental Lab Director <br />