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1 <br />' 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 Top Filling Method EPA 5030/8015M 8020 <br />' of Northern California Reference Number 1929 Instrument ID Var-GC1 <br /> 4005 North Wilson Way Sample Description Water Prepared 12-26-98 <br /> Stockton, CA 95205 Matrix Water Analyzed 12-26-98 <br /> Attn Tim Cuellar Analyst Jim Phillips Reported 1-5-99 <br /> 1 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Gasoline MTBE Benzene Toluene Ethyl Benzene Total Xylenes <br /> I <br /> Spike Concentration 110 222 1 34 7 82 1 84 948 <br />' Units uglL uglL ug1L ug1L ug/L ug/L <br /> LCS Batch # V D268W V-D268W V D268W V-D268W V-D268W V D268W <br />' LCS % Recovery 108% 132% 114% 97 1% 100% 960% <br /> Surrogate Recovery 107% 104% 104% 104% 104% 104% <br /> Control Limas 70-130 % 70 130 % 70-130 % 70-130 % 70-130 % 70-130 % <br />' MS/MSD Batch # V D268W V-D268W V D268W V-D268W V-D268W V D268W <br /> MS % Recovery 115% 104% 116% 96 70/6 108% 960% <br /> Surrogate Recovery 115% 110% 110% 110% 110% 110% <br />' MSD % Recovery 108% 101% 113% 96 7% 998% 95 0% <br /> Surrogate Recovery 115% 110% 110% 110% 110% 110% <br /> Relative % Difference 608% 247% 246% 00335% 728% 1 08% <br /> Methanol Blank ND ND ND ND NO 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 /> 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 MSIMSD's are advisory only and are not used to accept or <br /> Ireject batch results <br /> ANALYST APPROVED BY <br /> Clan J Cone Jarfies C Phrllrps r <br /> invironmental Lab Director <br />