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I <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 /> i <br /> Advanced GeoEnvironmental, Inc Client Project ID Three B s Truck Plaza Method EPA 5030/8015M 8020 <br /> of Northern California Reference Number 2622 Instrument ID Var-GC1 <br /> 4005 North Wilson Way Matrix Water Prepared 11-2499 <br /> Stockton, CA 95205 Analyst Jim Phillips Analyzed 11,,.24-99 <br /> Ann Tim Cuellar Reported 12-2-99 <br /> QUALITY CONTROL DATA REPORT <br /> IANALYTE Gasoline MTBE Benzene Toluene Ethyl Benzene Total Xylenes <br /> Spike Concentration 110 222 1 34 7 82 1 84 948 <br /> Units uglL ug/L ug/L ug/L uglL ug/L <br /> LCS Batch # VW N249 VW N249 VW N249 VW-N249 VW-N249 VW N249 <br /> LCS % Recovery 100% 108% 105% 97 5% 106°x° 943% <br /> Surrogate Recovery 105% 1010/0 101% 101% 101% 101% <br /> Control Limits 70 130 % 70 130 % 70 130 % 70-130 % 70 130 % 70-130 % <br /> MS/MSD Batch # VW-N249 VW N249 VW N249 VW N249 VW-N249 VW N249 <br /> Sp:ke Concentration 110 2 22 1 34 7 82 1 84 948 <br /> MS % Recovery 99 3% 108% 98 3% 99 5% 106% 93 9% <br /> Surrogate Recovery 104% 102% 102% 102% 102% i02% <br /> MSD % Recovery 996% 96 3% 107% 990% 106% 932% <br /> Surrogate Recovery 103% 102% 102% 102% 102% 102% <br /> Relative % Difference 02111% 142% 8 10% 0126% 0 297% 0765% <br /> I <br /> Methanol Blank ND ND ND ND ND ND <br /> Surrogate Recovery 99 1% 97 9% 97 9% 97 9% 97 9% 979% <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 OC 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 BY <br /> Clan J Cone J es C Phrllrps <br /> nvrronmental Lab Drrecror <br />