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I <br /> 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 Geo Environmental Inc Client Project ID Top Filling Method EPA 5030/8015M 8020 <br />' of Northern California Reference Number 915 Instrument ID Var-GC1 <br /> 1803 West March Lane, Suite A Matrix Water Prepared 10-28-96 <br /> Stockton CA 95207 Analyst Jim Phillips Analyzed 10-28 96 <br /> Attn Tim Cuellar Reported 10-31 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 2 00 <br /> Units uglL uglL uglL uglL uglL ug/L <br />' LCS Batch # VG-0286W VB-0286W VB 0286W VB 0286W VB 0286W VB 0286W <br /> LCS % Recovery 103% 130% 980% 114% 112% 119% <br /> Surrogate Recovery 103% 966% 966% 966% 966% 966% <br /> Control Limits 70-130 % 70-130 % 70 130 % 70-130 % 70-130 % 70-130 % <br /> MS/MSD Batch # VG 0286W VB 0286W VB 0286W VB-0286W VB 0286W VB 0286W <br /> MS % Recovery 984% 110% 95 6% 105% 106% 1 1 1% <br /> Surrogate Recovery 105% 101% 101% 101% 101% 101% <br />' MSD % Recovery 103% 932% 872% 104% 106% 110% <br /> Surrogate Recovery 106% 103% 103% 103% 103% 103% <br /> Relative % Difference 3 92% 106% 3 28% 0 564% 0442% 0841% <br />' Methanol Blank ND ND NO ND ND ND <br /> Surrogate Recovery 105% 104% 104% 104% 104% 104% <br /> 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 MSIMSD s are advisory only and are not used to accept or <br />' reject batch results <br /> ANALYST APPROVED BY <br /> Clair J Cone Ja s C 'Phillips <br /> nvrronmental Lab Director <br />