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CASTLE ANALYTICAL LABORATORY <br /> Environmental Testing Services 2333 Shuttle Drive, Atwater CA, 95301 Phone {209} 384-2930 <br /> Certificate #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 1049 Instrument 1D Var-GC1 <br /> 1803 West March Lane, Suite A Matrix Water Prepared 3-23-97 <br /> Stockton, CA 95207 Analyst Jim Phillips Analyzed 3-23-97 <br /> Attn Tim Cuellar Reported 3-27-97 <br />' CILIALITY 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 3237W VB-3237W VB-3237W VB-3237W VB-3237W VB-3237W <br /> LCS % Recovery 100% 108% 923% 99 1% 945% 964% <br /> Surrogate Recovery 102% 100% 100% 100% 100% 100% <br /> Control Limits 70 130 % 70-130 % 70-130 % 70-130 % 70-130 % 70-130 % <br /> MS/MSD Batch # VG-3237W VB-3237W VB-3237W VB-3237W VB-3237W VB-3237W <br /> MS % Recovery 109% 141% 91 0% 92 2% 95 8% 960% <br /> Surrogate Recovery 102% 973% 973% 97 3% 973% 973% <br /> MSD % Recovery 109% 128% 933% 935% 955% 964% <br /> Surrogate Recovery 103% 990% 990% 990% 99 00/0 990% <br /> Relative % Difference 0 753% 9 50% 2 50% 1 360/a 0282% 0390% <br /> Methanol Blank NO NO ND NO NO ND <br /> Surrogate Recovery 104% 103% 103% 103% 103% 103% <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 MS/MSD's are advisory only and are not used to accept or <br /> reject batch results <br /> ANALYST APPROVED BY <br /> Clary J t Cone J s Ph Ips <br /> nvuonmental Lab Director <br />