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1 <br /> CASTLE ANALYTICAL LABORATORY <br />' Environmental Testing Services 2333 Shuttle Drive, Atwater CA 95301 Phone 1209) 384-2930 <br /> Certificate 42079 Fax (209) 384-1507 <br />' Advanced GeoEnvironmental Inc Client Project ID Top Filling Method EPA 5030l8015M,8020 <br /> of Northern California Reference Number 1268 Instrument ID Var-GC1 <br /> 1803 West March Lane, Suite A Matrix Water Prepared 9-26-97 <br /> Stockton, CA 95207 Analyst Jim Phillips Analyzed 9-26-97 <br />' Attn Tim Cuellar Reported 10-397 <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 2 00 <br /> Units ug1L uglL uglL ug/L ug1L ug/L <br />' LCS Batch # VG-9267W VB-9267W VB-9267W VB 9267W VB-9267W VB-9267W <br /> LCS % Recovery 104% 962% 963% 970% 968% 985% <br /> Surrogate Recovery 102% 104% 104% 104% 104% 104% <br /> Control Limits 70-130 % 70 130 % 70 130 % 70-130 % 70-130 % 70-130 % <br />' MS/MSD Batch # VG-9267W VB-9267W VB-9267W VB 9267W VB-9267W VB 9267W <br /> MS % Recovery ill% 173% 97 5% 968% 101% 100% <br /> Surrogate Recovery 108% 104% 104% 104% 104% 104% <br /> MSD % Recovery 112% 139% 948% 925% 975% 948% <br /> Surrogate Recovery 106% 102% 102% 102% 102% 102% <br /> Relative % Difference 00689% 21 7% 242% 330% 3 02% 444% <br />' Methanol Blank ND ND ND ND ND ND <br /> Surrogate Recovery 101% 101% 101% 101% 101% 101% <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 <br /> ANALYST APPROVED BYC/ - <br /> Clan J Cone J� es C Ph1lbps <br /> /Environmental Lab Director <br />