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SIERRA ANALYTICAL <br /> GHH Engineering, Inc. ELAP No.: 2320 <br /> 11960 Heritage Oak PI,Suite 2B Date Sampled: 10/17/01 <br /> Auburn, CA 95603 Date Received: 10/23/01 <br /> Date Prepared: 10/23/01 <br /> Date Analyzed: 10/23/01 <br /> Sierra Project No.: 0110-386 Analyst: SM <br /> Client Project ID: USA-Stockton/ 5007.10 <br /> Sample Matrix: Water Report Date: 10/24/01 <br /> Oxygenated Fuel Additives (GC/MS) <br /> Preparation Method: Purge&Trap Concentrator(EPA Method 5030) <br /> Analysis Method: EPA Method 8260B <br /> Client Sample No.: Mw-2P NM-IP Mw-2 <br /> Practical <br /> Quantitation Units <br /> Limit <br /> Sierra Sample No.: 28868 28869 28870 <br /> Analytes: <br /> 1,2-DCA 4.8 5.9 ND 1.0 µglL <br /> TBE 59 0.69 0.77 0.5 µg11.. <br /> IPE ND ND ND 5.0 Aga- <br /> TBE ND ND ND 5.0 µ91L, <br /> TAME ND ND ND 5.0 µg11- <br /> 7BA ND ND ND 5.0 µglL <br /> Dilution Factor 1 1 1 QC Limits - <br /> Surrogate Recovery: <br /> ibromotluoromethane 117 114 115 80-120 <br /> Toluene-dB 100 100 100 81-117 % <br /> -Bromofluorobenzene 99 qL__J 100 74-121 <br /> Quality Assurance/Quality Control Data <br /> 10C Reference No.: 011023-28870 <br /> nal tes• LCS LCS Spike Spike Dup. Spike RPD RPD <br /> y %Ree. C Limits % Rec. % Rec. C Limits C Limits <br /> MTBE 90 80- 120 98 96 37-160 2.1 0-30 <br /> ND means Not Detected <br /> Reporting Limit(RL)=Practical Quantitation Limit(PQL)x Dilution Factor <br /> i <br />