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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 /> 'FF <br /> Advanced GeoEnvironmental, Inc Client Project ID Pacific Car Wash Method EPA 503018015M,8020 <br /> of Northern California Reference Number 3867 Instrument ID Var-GC1 <br /> 837 Shaw Road Matrix Water Prepared 7-4-01 <br /> Stockton CA 95215 Analyst Jim Phillips Analyzed 7-4-01 <br /> Attn Tim Cuellar Reported 7-12-01 <br /> QUALITY CONTROL DATA REPORT <br /> 1 ANALYTE Gasoline MTBE Benzene Toluene Ethyl Benzene Total Xylenes <br /> Spike Concentration 110 2 08 1 28 7 72 1 84 924 <br />' Units uglL uglL uglL uglL ug1L ug/L <br /> LCS Batch# VW-7041 VW-7041 VW-7041 VW 7041 VW-7041 VW-7041 <br />' LCS %Recovery 940% 958% 944% 929% 967% 940% <br /> Surrogate Recovery 105% 102% 102% 102% 102% 102% <br /> 0 Control Limits 70-130% 70-130% 70-130% 70-130% 70-130% 70-130% <br /> MS/MSD Batch# VW-7041 VW-7041 VW-7041 VW-7041 VW-7041 VW-7041 <br /> Spoke Concentration 110 2 08 1 28 772 1 84 924 <br />' MS% Recovery 972% 975% 994% 923% 955% 933% <br /> Surrogate Recovery 104% 100% 100% 100% 100% 100% <br /> MSD% Recovery 962% 928% 101% 962% 101% 981% <br />' Surrogate Recovery 104% 101% 101% 101% 101% 101% <br /> Relative%Difference 0934% 352% 206% 413% 586% 498% <br /> I , <br /> Methanol Blank ND ND ND NO ND ND <br /> Surrogate Recovery 937% 939% 939% 939% 939% 939% <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 /> ANALYS APPROVED BY <br /> Clary J Cone Ja C Ph ps <br /> oratory Director <br />