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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 /> Advanced GeoEnvironmental, Inc Client Project ID Norvmellim Method EPA 5030/8015M,8020 <br /> of Northern California Reference Number 764 Instrument ID Vat-GC1 <br /> 1803 West March Lane, Suite A Matrix Water Prepared 5-30-96 <br /> Stockton, CA 95207 Analyst Jim Phillips Analyzed 5-30-96 <br /> Attn Tim Cuellar Reported 6-4-96 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Gasoline MTBE Benzene Toluene Ethyl Benzene Total Xylenes <br /> ISpike 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 5306W VB 5306W VB-5306W VB 5306W VB-5306W VB-5306W <br /> LCS % Recovery 106% 113% 998% 100% 99 3% 990% <br /> Surrogate Recovery 103% 983% 983% 98 3% 983% 983% <br /> Control Limits 70-130 % 70-130 % 70-130 % 70-130 % 70-130 % 70-130 % <br /> MSIMSD Batch # VG-5306W VB 5306W VB 5306W VB 5306W VB 5306W VB-5306W <br /> MS % Recovery 106% 128% 100% 943% 997% 97 1% <br /> Surrogate Recovery 104% 983% 983% 983% 98 3% 983% <br /> MSD % Recovery 107% 104% 991% 931% 976% 95 5% <br /> I Surrogate Recovery 101% 100% 100% 100% 100% 100% <br /> Relative % Difference 0555% 211% 0 81 9% 116% 1 81% 1 54% <br /> IMethanol Blank ND ND ND ND ND ND <br /> Surrogate Recovery 103% 103% 103% 103% 103% 103% <br /> I Please Note <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 OC limits and recoveries for MS/MSD's are advisory only and are not used to accept or <br /> reject batch results <br /> I <br /> ANALYST (Ax--�uAPPROVED BY <br /> Carr J Cone J es 1ps <br /> Envrronmenial Lab Director <br /> I � <br />