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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 1 507 <br />' Advanced GeoEnvcronmental Inc Client Project ID Nomellini Method EPA 5030/8015M,8020 <br /> of Northern California Reference Number 1121 Instrument ID Var-GC1 <br /> 1803 West March Lane, Suite A Matrix Water Prepared 5-20-97 <br /> Stockton, CA 95207 Analyst Jim Phillips Analyzed 5-20-97 <br /> Attn Tim Cuellar Reported 5-27-97 <br />' QUALITY CONTROL DATA REPORT <br /> IANALYTE Gasoline MTBE Benzene Toluene Ethyl Benzene Total Xylenes <br />' Spike Concentration 100 1 00 1 00 1 00 1 00 2 00 <br /> Units ug/L ug/L ug/L ug/L ug/L ug/L <br />' LCS Batch # VG 5207W VB-5207W VB-5207W VB-5207W VB 5207W VB-5207W <br /> LCS % Recovery 378% 941% 86 1% 92 7% 960% 954% <br /> Surrogate Recovery 99 9% 958% 95 8% 95 8% 95 8% 958% <br /> Control Limits 70-130 % 70-130 % 70 130 % 70-130 % 70 130 % 70-130 % <br />' MS/MSD Batch # VG 5207W VB 5207W VE-5207W VB 5207W VB-5207W VB-5207W <br /> MS % Recovery 934% 113% 946% 924% 96 6% 928% <br />' Surrogate Recovery 98 6% 948% 948% 948% 948% 948% <br /> MSD % Recovery 943% 152% 96 7% 946% 978% 95 4% <br /> Surrogate Recovery 102% 963% 963% 963% 963% 963% <br />' Relative % Difference 0 931% 9 77% 224% 2 19% 1 33% 2 66% <br /> I Methanol Blank ND ND ND ND ND ND <br /> Surrogate Recovery 966% 965% 965% 96 5% 96 5% 965% <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 /> reject batch results <br /> I <br /> ANALYST f APPROVED BY <br /> n J Cone s C Phillips <br /> 2ronmental,Cab Director <br /> I <br />