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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 Nomellini Method EPA 5030/8015M,8020 <br />' of Northern California Reference Number 2343 Instrument ID Var-GC1 <br /> 4005 North Wilson Way Matrix Water Prepared 7-2-99 <br /> Stockton, CA 95205 Analyst Jim Phillips Analyzed 7-2-99 <br /> Attn Tim Cuellar Reported 7-12-99 <br /> I <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 ug/L <br /> I LCS Batch # VW 7029 VW-7029 VW-7029 VW-7029 VW-7029 VW-7029 <br /> LCS % Recovery 964% 91 3% 107% 97 1% 104% 908% <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 # VW-7029 VW-7029 VW 7029 VW 7029 VW-7029 VW-7029 <br /> Spike Concentration 110 2 22 1 34 7 82 1 84 948 <br />' MS % Recovery 89 7% 91 0% 884% 93 1% 101% 93 1% <br /> Surrogate Recovery 104% 102% 102% 102% 102% 102% <br /> MSD % Recovery 936% 96 7% 893% 936% 104% 943% <br /> ISurrogate Recovery 106% 103% 103% 103% 103% 103% <br /> Relative % Difference 4 12% 608% 1 00% 0582% 2 56% 1 22% <br /> Methanol Blank ND ND ND ND ND ND <br /> Surrogate Recovery 102% 102% 102% 102% 102% 102% <br /> IThe 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 W` ! APPROVED BY <br /> Clary J Cone J es C Phillips <br /> Environmental Lab Director <br /> I <br />