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CASTLE ANALYTICAL LABORATORY <br /> ' Environmental Testing Services P O Box 1360, Winton, CA 95388 Phone (209) 384-2930 <br /> Certificate #2079 Fax (209) 384-1507 <br /> F <br /> anced GeoEnvkronmental, Inc Client Project ID Pacific Car Wash Method EPA 5030/8015M,8020orthern California Reference Number 828 instrument ID Var-GC13 West March Lane, Suite A Matrix Water Prepared 8 6-96ckton, CA 95207 Analyst Jim Phillips Analyzed 8-6 96n Tim Cuellar Reported 8 9 96 <br />' QUALITY CONTROL DATA REPORT <br /> ANALYTE Gasoline MTBE Benzene Toluene Ethyl Benzene Total Xylenes <br />' Spike Concentration 100 1 00 1 00 1 00 1 00 200 <br /> Units ug1L ug/L ug1L uglL ug/L ug/L <br /> LCS Batch # VG 8066W VB 8066W VB 8066W VB 8066W VB-8066W VB-8066W <br /> LCS % Recovery 847% 117% 112% 110% 107% 108% <br /> Surrogate Recovery 102% 98 0% 98 0% 980% 98 0% 980% <br /> Control Limas 70 130 % 70-130 % 70-130 % 70-130 % 70-130 % 70-130 % <br /> MS/MSD Batch #1 VG 8066W VB-8066W VB 8066W VS 8066W VB 8066W VB 8066W <br />' MS % Recovery 113% 132% 112% 116% 115% 115% <br /> Surrogate Recovery 104% 990% 99 0% 990% gg Ogg 99 0% <br /> MSD % Recovery 114% 116% 110% 112% 113% 113% <br /> Surrogate Recovery 106% 102% 102% 102% 102% 102% <br /> Relative % Difference 140% 130% 1 38% 3 59% 1 48% 2 10% <br />' Methanol Blank ND ND ND ND ND ND <br /> Surrogate Recovery 984% 98 6% 98 6% 986% 986% 986% <br /> f <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 /> I ANALYST <br /> APPROVED BY <br /> Clan J& <br /> mes C P�Ips <br /> Environmental Lab Director <br />