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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 GeoEnvironmental, Inc Client Project ID Rainwater Car Wash Method EPA 5030/8015M,8020 <br /> of Northern California Reference Number 5420 Instrument ID Var-GC1 <br /> 837 Shaw Road Sample Description Water Extracted 01-29-03 <br /> Stockton CA 95215 Analyst Jim Phillips Analyzed 01-29-03 <br /> Attn Tim Cuellar Reported 02-11-03 <br /> ' QUALITY CONTROL DATA REPORT <br /> ' ANALYTE Gasoline MTBE Benzene Toluene Ethyl Benzene Total Xylenes <br /> Spike Concentration 110 210 1 32 714 1 84 922 <br /> ' units ug/L uglL ug/L ug1L ug/L uglL <br /> LCS Batch# VW-1293 VW-1293 VW-1293 VW-1293 VW-1293 VW-1293 <br /> ' 119% 861% 937% 104% 119% 121% <br /> Surrogate Recovery 106% 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-1293 VW-1293 VW-1293 VW-1293 VW-1293 VW-1293 <br /> i <br /> Spike Concentration 110 210 1 32 7 94 1 84 922 <br /> t MS % Recovery 106% 771% 862% 991% 117% 116% <br /> Surrogate Recovery 107% 104% 104% 104% 104% 104% <br /> MSD%Recovery 100% 100% 880% 104% 122% 124% <br /> ' Surrogate Recovery 113% 108% 108% 108% 108% 108% <br /> Relative%Difference 538% 240% 205% 438% 457% 653% <br /> ' Methanol Blank NO ND NO NO NO ND <br /> Surrogate Recovery 101% 100% 100% 100% 100% 100% <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 QC limits and recoveries for MSIMSD's are advisory only and are not used to accept or <br /> reject batch results <br /> t <br /> ' ANALYST APPROVED BY <br /> Clan J Cone Ja es hillips <br /> roratory Director <br />