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CASTLE ANALYTICAL LABORATORY <br /> ' Environmental Testing Services P O Box 1360 Winton CA 95388 Phone (2091 384-2930 <br /> Certificate #2079 Fax (209) 384-1507 <br /> ' F[Ann <br /> vanced GeoEnvironmental, Inc Client Project ID Pacific Car Wash Method EPA 5030/8015M,6020 <br /> Northern California Reference Number 831 Instrument ID Var GC1 <br /> 03 West March Lane, Suite A Matrix Water Prepared 8-8-96 <br /> ckton CA 95207 Analyst Jim Phillips Analyzed 88 96 <br />' Tim Cuellar Reported 8-13 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 ug/L ug/L ug/L ug/L ug/L ug/L <br />' LCS Batch # VG 8086W VB 8086W VB 8086W VB-8086W VB 8086W VB-8086W <br /> LCS % Recovery 116% 118% 113% 108% 107% 106% <br /> Surrogate Recovery 102% 99 1% 99 1% 99 1% 99 1% 99 1% <br /> Control Limits 70-130 % 70-130 % 70-130 % 70-130 % 70 130 % 70 130 % <br /> MS/MSD Batch # VG 8086W VB 8086W VB 8086W VS 8086W V8-8086W VB 8086W <br />' MS % Recovery ill% 130% 112% 109% 107% 108% <br /> Surrogate Recovery 104% 980% 980% 980% 980% 98 0% <br /> MSD % Recovery 114% 109% 113% 108% 108% 108% <br /> Relative <br /> urrogate Recovery 104% 99 2% 99 2% 99 2% 99 2% 99 2% <br /> % Difference 247% 177% 0930% 0615% 1 20% 0203% <br />' Methanol Blank ND ND ND ND ND ND <br /> Surrogate Recovery 984% 986% 98 6% 98 6% 986% 986% <br /> The LCS (Laboratory Check Sample) is a control sample of known interferent free matrix that is fortified with representative analytes and <br /> IV <br /> 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 MS/MSD's are advisory only and are not used to accept or <br /> reject batch results <br /> ANALYST APPROVED BY <br /> Clan J Cone J es C Phrlb;�s <br /> IEnvironmental Lab Director <br />