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1 <br /> 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 Pacific Carwash Method EPA 503018015M 8020 <br /> Northern California Reference Number 7014(1-20) Instrument ID Var-GC1 <br /> 37 Shaw Road Sample Description Water Extracted 06-07-04 <br /> ockton CA 95215 Analyst Jim Phillips Analyzed 06-07-04 <br /> tn Tim Cue;lar Reported 06-11-04 <br />' QUALITY CONTROL DATA REPORT <br />' ANALYTE Gasoline MTBE Benzene Toluene Ethyl Benzene Total Xylenes <br /> Spike Concentration 110 2 10 1 32 794 1 84 922 <br />' Units ug)L ug/L ug/L ug/L ug/L ug/L <br /> LCS Batch# VW 6074 VW-6074 VW-6074 VW-6074 VW-6074 VW-6074 <br />' LCS % Recovery 103% 120% 104% 945% 101% 980% <br /> Surrogate Recovery 101% 974% 974% 974% 974% 974% <br /> lie Control Llmfts 70-130% 70-130% 70-130% 70-130% 70 130% 70-130 % <br /> MSIMSD Batch# VW-6074 VW-6074 VW-6074 VW-6074 VW-6074 VW-6074 <br />' Spike Concentration 110 2 10 1 32 794 1 84 9 22 <br />' MS %Recovery 927% 112% 101% 933% 978% 955% <br /> Surrogate Recovery 100% 978% 978% 978% 978% 978% <br /> MSD% Recovery 954% 114% 102% 940% 990% 966% <br /> I Surrogate Recovery 101% 985% 985% 985% 985% 985% <br /> Relative% Difference 268% 172% 0514% 0783% 108% 1 01% <br /> Method Blank ND ND ND ND ND ND <br /> Surrogate Recovery 997% 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 p ative analytes and <br /> analyzed using the same reagents, preparation and analytical methods employed for the samples The LCS %recovery is used for validatior <br /> of sample batch results Due to matrix effects the CC limits and recoveries for MS/MSD's are advisory only and are not used to accept or <br /> reject batch results <br /> i ` <br /> APPROVED BY '� APPROVED BY <br /> Clan Cone Jams fps <br /> Laboratory Manage Lab story Director <br />