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' CASTLE ANALYTICAL LABORATORY <br /> Environmental Testing Services 2333 Shuttle Drive Atwater,CA 95301 Phone (209)384-2930 <br /> ' Certificate#2079 Fax (209)384-1507 <br /> Advanced Geo Envi ron mental Inc Client Project Ill Rainwater Car Wash Method EPA 503018015M 8020 <br /> of Northern California Reference Number 3389 Instrument ID Var-GC1 <br /> 4005 North Wilson Way Matrix Water Prepared 12-21-00 <br /> Stockton CA 952Q5 Analyst Jim Phillips Analyzed 12-21-00 <br /> Attn Tim Cuellar Reported 12-29-00 <br /> QUALITY CONTROL DATA REPORT <br /> ' ANALYTE Gasoline MTBE Benzene Toluene Ethyl Benzene Total Xylenes <br /> I <br /> Spike Concentration 110 2 08 1 28 772 1 84 924 <br /> I ' Units ug/L ug/L ug/L ug/L ug1L ug/L <br /> LCS Hatch# VW-D210 VW-D210 VW-D210 VW-D210 VW-D210 VW-D210 <br /> ' LCS %Recovery 131% 880% 110% 105% 106% 104% <br /> Surrogate Recovery 108% 106% 106% 106% 106% 106% <br /> Control Limits 70-130% 70-130% 70-130 % 70-130% 70-130% 70 130 % <br /> ' MSIMSD Batch# VW-D210 VW-D210 VW-D210 VW-D210 VW-D210 VW-0210 <br /> Spike Concentration 110 2 08 1 28 7 72 1 84 924 <br /> 1 MS %Recovery 103% 860% 965% 100% 104% 101% <br /> Surrogate Recovery 111% 111% 111% 111% 1110/0 111% <br /> MSD% Recovery 104% 842% 101% 103% 106% 103% <br /> i ' Surrogate Recovery 110% 109% 109% 109% 109% 109% <br /> Relative% Difference 0848% 205% 426% 233% 1 83% 1 70% <br /> ' Methanol Blank ND NO ND NO ND NO <br /> Surrogate Recovery 944% 967% 967% 967% 967% 967% <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 OC limits and recoveries for MSIMSD's are advisory only and are not used to accept or <br /> reject batch results <br /> 1 <br /> ' ANALYSTAPPROVED BY <br /> Glary J Cone Ja tr►It►ps <br /> vrronmental Lab Director <br />