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' CASTLE ANALYTICAL LABORATORY <br /> Environmental Testing Services 2333 Shuttle Drive Atwater, CA 95301 Phone 1209) 384-2930 <br /> Certificate #2079 Fax 1209) 384-1507 <br /> Advanced GeoEnvironmental, Inc Client Project ID Nomellini Method EPA 5030/8015M,8020 <br />' of Northern California Reference Number 1897 Instrument ID Var-GC1 <br /> 4005 North Wilson Way Matrix Water Prepared 12-11-98 <br /> Stockton, CA 95205 Analyst Jim Phillips Analyzed 12-11-98 <br /> Attn Tim Cuellar Reported 12-21-98 <br />' QUALITY CONTROL DATA REPORT <br />' ANALYTE Gasoline MTBE Benzene Toluene Ethyl Benzene Total Xylenes <br />' Spike Concentration 110 222 1 34 7 82 1 84 948 <br /> Units ug/L ug/L ug/L ug/L ug/L ug/L <br />' LCS Batch # VG-D1 18W VB-D11BW VB-D1 18W VB-D1 18W VB-D1 18W VB D1 18W <br /> LCS % Recovery 966% 75 6% 96 1% 923% 98 1% 93 2% <br /> Surrogate Recovery 105% 103% 103% 103% 103% 103% <br /> Control Limits 70-130 % 70-130 % 70-130 % 70-130 % 70-130 % 70-130 % <br />' MS/MSD Batch # VG-D1 18W VB-D118W VB DI 18W VB-D1 18W VB-Di 18W VB DI 18W <br /> MS % Recovery 95 0% 98 8% 99% 948% 99 3% 946% <br /> Surrogate Recovery 105% 102% 102% 102% 102% 102% <br /> MSD % Recovery 966% 111% 98 9% 97 1% 101% 97 1% <br /> Surrogate Recovery 106% 103% 103% 103% 103% 103% <br /> Relative % Difference 1 56% 11 8% 0216% 232% 1 55% 236% <br /> Methanol Blank ND ND ND ND ND ND <br /> Surrogate Recovery 100% 101% 101% 101% 101% 101% <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 /> ANALYST APPROVED BY <br /> Clan J Cone a s C Phillips <br /> Environmental Lab Director <br /> I <br />