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1 <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 GeoEnvironmental, Inc Client Project ID Nomellmi Construction Method EPA 5030/8015M,8020 <br /> of Northern California Reference Number 688 Instrument ID Var-GC1 <br /> 1803 West March Lane, Suite A Matrix Water Prepared 3-7-96 <br /> Stockton, CA 95207 Analyst Jim Phillips Analyzed 3-7-96 <br />' Ann Kevin McKibben Reported 3-11-96 <br />' QUALITY CONTROL DATA REPORT <br /> ANALYTE Gasoline Benzene Toluene Ethyl Benzene Total Xylenes <br /> Spike Concentration 100 1 00 ` 1 00 100 300 <br /> Units ug/L ug/L ug/L ug/L ug/L <br /> LCS Batch # VG-3076W VB-3076W VB-3076W VB-3076W VB-3076W <br /> LCS % Recovery 108% 102% 105% 105% 106% <br /> Surrogate Recovery 102% 102% 102% 1020/6 102% <br /> Control Limits 70-130 % 70-130 9/6 70-130 % 70-130 % 70- <br /> 130 <br />' MS/MSD Batch # VG-3076W VB-3076W VB-3076W VB-3076W VB-3076W <br /> MS % Recovery 106% 103% 108% 101% 107% <br />' Surrogate Recovery 979% 101% 101% 101% 101% <br /> MSD % Recovery 105% 101% 106% 101% 104% <br /> Surrogate Recovery 974% 102% 102% 102% 102% <br />' Relative % Difference 0293% 1 69% 1 29% 0604% 280% <br />' Methanol Blank ND ND ND ND ND <br /> Surrogate Recovery 103% 103% 103% 103% 103% <br /> Surrogate Recovery 102% 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 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 /> Clan J Cone James C rl Ps <br /> Environmental Lab Director <br /> Environmental Lab Director <br />