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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 Geo Environmental Inc Client Project ID Nomellini Method EPA 503018015M,8020 <br /> of Northern California Reference Number 1474 Instrument 1D Var-GC1 <br /> 4005 North Wilson Way Matrix Water Prepared 3 2-98 <br /> Stockton, CA 95205 Analyst Jim Phillips Analyzed 3 2-98 <br />' Attn Tim Cuellar Reported 3-5 98 <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 00 200 <br /> Units ug/L ug/L ug/L ug/L ug/L ug/L <br />' LCS Batch # VG-3028W VB-3028W VB-3028W VB 3028W VB-3028W VB-3028W <br /> LCS % Recovery 91 5% 104% 803% 85 6% 834% 860% <br /> Surrogate Recovery 101% 939% 93 9% 93 9% 939% 939% <br /> Control Limits 70 130 % 70-130 % 70-130 % 70-130 % 70 130 % 70-130 % <br />' M$/MSD Batch # VG 3028W VB 3028W VB 3028W VS 3028W VB 3028W VB 3028W <br /> MS % Recovery 900% 706% 907% 906% 92 9% 927% <br /> Surrogate Recovery 104% 99 2% 99 2% 99 2% 99 2% 992% <br /> MSD % Recovery 941% 68 3% 86 7% 874% 91 2% 89 0% <br /> Surrogate Recovery 104% 99 5% 99 5% 99 5% 99 5% 99 5% <br /> Relative % Difference 404% 230% 4 01% 3 15% 1 68% 3 77% <br /> Methanol Blank ND ND ND ND ND ND <br /> Surrogate Recovery 102% 98 7% 98 7% 98 7% 987% 987% <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 /> I <br /> 1 <br /> ANALYST APPROVED BY <br /> Clan J Cone J es—t Phi 4s <br /> Environmental Lab Director <br />