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I <br /> CASTLE ANALYTICAL LABORATORY <br /> Environmental Testing Services P 0 Box 1360, Winton, CA 95388 Phone (209) 384-2930 <br /> Certificate #2079 Fax (209) 384-1507 <br /> I Advanced GeoEnvuonmental Inc Client Project ID Top Filling Method EPA 5030/8015M 8020 <br /> of Northern California Reference Number 742 Instrument ID Var-GC1 <br /> 1803 West March Lane, Suite A Matrix Water Prepared 4-30-96 <br /> Stockton, CA 95207 Analyst Jim Phillips Analyzed 4-30-96 <br /> Attn Tim Cuellar Reported 5-6 -96 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Gasoline Benzene Toluene Ethyl Benzene Total Xylenes <br /> ISpike Concentration 100 1 00 1 00 1 00 200 <br /> Units uglL ug/L ug/L ug/L ug/L <br /> ILCS Batch # VG-4306W VB 4306W VB 4306W VB 4306W VB 4306W <br /> LCS % Recovery 117% 95 5% 938% 934% 93 1% <br /> Surrogate Recovery 835% 894% 89 4% 894% 89 4% <br /> Control Limits 70-130 % 70 130 % 70-130 % 70-130 % 70-130 % <br /> MS/MSD Batch # VG 4306W VB-4306W VB 4306W VB 4306W VB 4306W <br />' MS % Recovery 104% 103% 97 4% 105% 99 3% <br /> Surrogate Recovery 947% 102% 102% 102% 102% <br /> MSD % Recovery 107% 106% 103% 108% 105% <br />' Surrogate Recovery 962% 103% 103% 103% 103% <br /> Relative % Difference 2 36% 263% 5 12% 2 53% 5 41% <br />' Methanol Blank ND ND ND ND ND <br /> Surrogate Recovery 905% 89 5% 89 5% 896% 89 5% <br /> tPlease 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 CC limits and recoveries for MS/MSD's are advisory only and are not used to accept or <br /> reject batch results <br /> � J <br /> ANALYSTAPPROVED BY <br /> C an J Cone mes C r lips <br /> Environmental Lab Director <br />