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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 Pac Car Wash Method EPA 503018015M,8020 <br /> of Northern California Reference Number 6371(21-40) Instrument ID Var-GC1 <br /> 837 Shaw Road Sample Description Water Extracted 12-08-03 <br /> Stockton CA 95215 Analyst Jim Phillips Analyzed 12-08-03 <br /> Attn Tim Cuellar Reported 12-18-03 <br />' QUALITY CONTROL DATA REPORT <br />' ANALYTE Gasoline MTBE Benzene Toluene Ethyl Benzene Total Xylenes <br /> Spike Concentration 110 2 10 1 32 7 94 1 84 922 <br /> Units ug/L ug/L ug/L ug/L ug1L ug/L <br />' LCS Batch# VW-D083 VW-DO83 VW-D083 VW-0083 VW-DO83 VW-DO83 <br /> LCS%Recovery 114% 115% 116% 142% 107% 105% <br /> Surrogate Recovery 104% 102% 102% 102% 102% 102% <br />' Control Limits 70-130% 70-130% 70-130% 70-130% 70-130 % 70-130% <br />' MS/MSD Batch# VW-DO83 VW-DO83 VW-D083 VW-DO83 VW-0083 VW-D083 <br /> Spike Concentration 110 2 10 1 32 794 1 84 922 <br />' MS %Recovery 108% 110% 1060/0 941% 100% 888% <br /> Surrogate Recovery 101% 99 6% 996% 996% 996% 996% <br /> MSD% Recovery 110% 194% 108% 965% 101% 896% <br />' Surrogate Recovery 101% 996% 996% 996% 996% 996% <br /> Relative% Difference 1 83% 298% 1 75% 248% 0757% 0820% <br />' Methanol Blank ND ND ND ND ND ND <br /> Surrogate Recovery 938% 956% 956% 956% 956% 956% <br /> The LCS(Laboratory Check Sample)is a control sample of known, interferent free matnx 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 /> f <br /> ANALYST APPROVED BY , <br /> Clary J Cone flames C Phr!lfps <br /> f Laboratory Director <br />