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1 <br /> i <br /> CASTLE ANALYTICAL LABORATORY <br /> Environmental Testing Services P 0 Box 1360, Winton, CA 95388 Phone (209) 384-2930 <br /> iCertificate #2079 Fax (209) 384-1507 <br /> Advanced GeoEnvironmental, Inc Client Project ID Top Filling Method EPA 5030/8015M,8020 <br /> of Northern California Reference Number 981 Instrument ID Var-GC1 <br /> 1803 West March Lane, Suite A Matrix Water Prepared 1-13-97 <br /> Stockton, CA 95207 Analyst Jim Phillips Analyzed 1-13-97 <br /> Attn Tim Cuellar Reported 1-17-97 <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-1137W VB-1137W VB-1137W VB 1137W VB-1137W VB-1137W <br /> LCS % Recovery 106% ill% 107% ill% 111% 112% <br /> Surrogate Recovery 101% 99 5% 99 5% 99 5% 99 5% 99 5% <br /> Control Limits 70-130 % 70-130 % 70-130 % 70-130 % 70-130 % 70-130 % <br />' MS/MSD Batch # VG-1137W VB 1137W VB-1137W VB-1137W VB-1137W VB-1137W <br /> MS % Recovery 106% 114% 85 5% 95 4% 100% 990% <br /> Surrogate Recovery 102% 992% 99 2% 992% 992% 99 2% <br />' MSD % Recovery 103% 114% 830% 928% 99 9% 964% <br /> Surrogate Recovery 101% 103% 103% 103% 103% 103% <br /> Relative % Difference 298% 0087% 2 31% 245% 0277% 2 55% <br /> Methanol Blank ND ND ND ND ND ND <br /> Surrogate Recovery 108% 95 8% 958% 95 8% 95 8% 95 8% <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 /> ANALYST APPROVED BY <br /> air J Cone mes C PhiMps <br /> Environmental Lab Director <br />