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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 GeoEnvironmental, Inc Client Project ID Flag City Chevron Method EPA 5030/8015M 8020 <br /> of Northern California Reference Number 1850 Instrument ID Var-GC1 <br /> 4005 North Wilson Way Matrix Water Prepared 11 16-98 <br /> Stockton, CA 95205 Analyst .Jim Phillips Analyzed 11-16-98 <br />' Attn Tim Cuellar Reported 11 18-98 <br />' QUALITY CONTROL DATA REPORT <br />' ANALYTE Gasoline MTBE Benzene Toluene Ethyl Benzene Total Xylenes <br /> Spike Concentration 110 2 22 1 34 7 82 1 84 948 <br /> Units ug/L ug/L ug/L ug/L ug/L ug1L <br /> LCS Batch # VG N168W VB-N168W VB-N168W VB-N168W VB-N168W V8-N168W <br /> LCS % Recovery 101% 115% 113% 98 7% 101% 907% <br /> Surrogate Recovery 103% 100% 100% 100% 100% 100% <br /> Control Limits 70 130 % 70 130 % 70-130 % 70-130 % 70 130 % 70 130 % <br /> MS/MSD Batch # VG N168W VB-N168W VB N168W VB-N168W VB-N168W VB-N168W <br /> MS % Recovery 112% 83 1% 107% 97 5% 100% 90 1% <br /> Surrogate Recovery 106% 103% 103% 103% 103% 103% <br /> MSD % Recovery 109% 803% 110% 98 7% 102% 91 6% <br /> Surrogate Recovery 105% 102% 101% 102% 102% 102% <br /> Relative % Difference 3 12% 3 27% 202% 1 13% 1 54% 1 59% <br /> Methanol Blank ND ND NO ND ND ND <br /> Surrogate Recovery 105% 105% 105% 105% 105% 105% <br /> The LCS (Laboratory Check Sample) is a control sample of known, interferent free matrix that is fortified with representative analytes and <br /> I 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 /> i <br /> ANALYST >� APPROVED 8 <br /> Clary one J es C Phillips <br /> nvrronmental Lab Director <br />