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SIERRA ANALYTICAL <br /> GHH Engineering, Inc. ELAP No.: 2320 <br /> 11960 Heritage Oak Pl, Suite 2B Date Sampled: 08/01/01 <br /> Auburn, CA 95603 Date Received: 08/03/01 <br /> Date Prepared: 08/08/01 <br /> Date Analyzed: 08/08/01 <br /> Sierra Project No.: 0108-044 Analyst: SM <br /> Client Project ID: USA-Stockton 15007.9 <br /> Sample Matrix: Water Report Date: 08/13/01 <br /> Oxygenated Fuel Additives(GC/MS) <br /> Preparation Method: Purge&Trap Concentrator(EPA Method 5030) <br /> Analysis Method: EPA Method 8260E <br /> Client Sample No.: MW-6P MW-4P MW-5P MW-3P MW-la <br /> Practical <br /> Quantitation Units <br /> Limit <br /> Sierra Sample No.: 22360 22361 22362 22363 22364 <br /> Analytes: <br /> 1,2-DCA 1.S ND 5.7 ND ND 1.0 tig/L <br /> MTBE 4.8 ND ND 29 40 0.5 µg/L <br /> • D1PE 13 ND 110 ND ND 5.0 µg/L <br /> TBE ND ND ND ND ND 5.4 }ig/L <br /> TAME ND ND ND ND ND 5.0 lig/L <br /> TBA ND ND ND 17 35 5.0 1Lg/L <br /> Dilution Factor 1 1 1 1 1 QC Limits - <br /> Surrogate Recovery: <br /> Dibromofluoromethane 103 103 103 103 103 80-120 <br /> Toluene-dS 100 100 100 101 103 81-117 % <br /> Broinofluorobenzene 103 103 102 103 1.03 74-121 <br /> Quality Assurance/Quality Control Data <br /> FoC—Reference No.: 010808-22361 <br /> p1 a Spike Dup. Spike RPD <br /> Analytes: %Rec. C Limits °o Rec. °o Ree. Lin-its 11pD C Limits <br /> Benzene 82 1 N - 1201 74 80 37-160 7.—S---TO-30 <br /> ND means Not Detected <br /> Reporting Limit(RL)=Practical Quantitation Limit(PQL)x Dilution Factor <br />