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CASTLE ANALYTICAL LABORATORY <br /> Environmental Testing Services 2333 Shuttle Drive, Atwater, CA 95301 Phone {209} 384-2930 <br /> Fax (209) 384-1507 <br /> Advanced GeoEnvironmental, Inc Client Project ID Pacific Car Wash Method EPA 503018015M,8020 <br />' of Northern California Reference Number 1348 Instrument ID Var-GC1 <br /> 4005 N Wilson Way Matrix Soil Prepared 12-3-97 <br /> Stockton, CA 95205 Analyst Clan Cone Analyzed 12-3-97 <br /> Attn Tim Cuellar Reported 12-3-97 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Gasoline MTBE Benzene Toluene Ethyl Benzene Total Xylenes <br />' Spike Concentration 200 200 200 200 200 400 <br />' Unns mg/kg ug/kg ug/kg uglkg ug/kg ug/kg <br /> LCS Batch # VG D037 VB-D037 VB-D037 VB D037 VB-D037 VB-D037 <br />' LCS % Recovery 89 5% 121% 116% 115% 113% 116% <br /> Surrogate Recovery 113% 119% 119% 119% 119% 119% <br /> Control Limits 70-130 % 70-130 % 70-130 % 70-130 % 70-130 % 70-130 % <br /> MS/MSD Batch # VG-DO37 VB-D037 VB-DO37 VB-D037 VS-D037 VB-D037 <br />' MS % Recovery 72 6% 67 9% 76 1% 764% 81 3% 789% <br /> Surrogate Recovery 904% 880% 880% 880% 880% 880% <br />' MSD % Recovery 724% 750% 767% 75 1% 812% 78 6% <br /> Surrogate Recovery 908% 88 9% 889% 889% 889% 8B 9% <br /> Relative % Difference 0333% 7 90% 0804% 156% 0 165% 0334% <br />' Methanol Blank ND NO NO ND NO ND <br /> Surrogate Recovery 106% 106% 106% 106% 106% 106% <br /> Please Note <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 M51MSD s are advisory only ana are not usea to accept or <br /> reject batch results <br /> ANALYST APPROVED BY <br /> Clary J Cone J Arps <br /> Environmental Lab Director <br />