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i <br /> CASTLE ANALYTICAL LABORATORY <br /> Environmental Testing Services 2333 Shuttle Drive, Atwater, CA 95301 Phone 12091 384-2930 <br /> Certificate 112079 Fax 12091 384-1507 <br /> IAdvanced GeoEnvtronmental, Inc Client Project ID Top Filling Method EPA 5030/8015M,8020 <br /> of Northern California Reference Number 1630 Instrument ID Var-GC1 <br /> 4005 North Wilson Way Matrix Water Prepared 6-19-98 <br /> Stockton, CA 95205 Analyst Jim Phillips Analyzed 6-19 98 <br /> Attn Tim Cuellar Reported 623-98 <br /> IQUALITY 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-6198W VB-6198W VB-6198W VB-6198W VB-6198W VB-6198W <br /> LCS % Recovery 101% 132% 97 5% 997% 977% 984% <br /> Surrogate Recovery 100% 101% 101% 101% 101% 101% <br /> Control Limits 70-130 % 70-130 % 70-130 % 70-130 % 70-130 % 70-130 % <br /> MS/MSD Batch # VG-6198W VB-6198W VB-6198W VB-6198W VB-6198W VB-6198W <br /> I MS % Recovery 110% 122% 954% 965% 976% 974% <br /> Surrogate Recovery 101% 104% 104% 104% 104% 104% <br /> MSD % Recovery 108% 107% 100% 100% 102% 101% <br /> Surrogate Recovery 104% 101% 101% 101% 101% 101% <br /> Relative % Difference 1 84% 122% 454% 3 61% 4 51% 397% <br /> Methanol Blank CJD ND ND ND ND ND <br /> Surrogate Recovery 983% 977% 977% 97 7% 97 7% 977% <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 /> e.4 ANALYST APPROVED BY <br /> Clary J Cone ames C -Phillips <br /> Environmental Lab Director <br />