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' SIERRA ANALYTICAL <br />' GHH Engineering, Inc. ELAP No.: 2320 <br /> 8084 Old Auburn Road, Suite E Date Sampled: 01/11/01 <br /> Citrus Heights, CA 95610 Date Received: 01/20/01 <br />' Date Prepared: 01/23/01 <br /> Date Analyzed: 01/23/01 <br /> Sierra Project No.: 0101-363 Analyst: STI <br /> Client Project ID: USA-Stockton/5007.10 <br /> Sample Matrix: Water Report Date: 01/24/01 <br />' Oxygenated Fuel Additives (GC/MS) <br /> Preparation Method: Purge& Trap Concentrator(EPA Method 5030) <br /> Analysis Method: EPA Method 3260B <br /> Client Sample NO.: MW-6P MW-4P Mw-5P MW-3P MW-1 <br /> Practical <br /> Quantitation Units <br />' Sierra Sample No.: 1811 1812 1813 1814 1815 Limit <br /> Analytes: <br /> 1,2-DCA 15 ND 16 1.2 ND 1.0 ktglL <br /> MTBE ND ND ND 20 69 1.0 ltg/L <br /> PE 45 ND 130 6.2 ND 5.0 µg/L <br /> BE ND ND ND ND ND 5.0 ytg/L <br /> ND ND ND ND ND 5.0 'tg/L <br /> ItAIIIE <br /> A ND ND ND ND ND 5.0 Ag/L <br /> ilution Factor 1 1 1 1 1 QC Limits _ <br />' Surrogate Recovery: <br /> ibromofluoromethane 100 93 88 90 90 80-120 <br /> Ioluene-d8 95 92 92 90 93 81-117 % <br /> II-Bromotluorobenzene 81 83 76 83 87 74-121 <br /> 1Reference No.: 010123-BL Quality Assurance/Quality Control Data <br /> QC <br /> Analytes: LCS LCS Spike Spike Dup. Spike RPD RPD <br /> % Rec. C Limits % Rec. % Rec. C Limits C Limits <br /> MTBE 88 80- 120 94 92 37-160 2.2 1 0-30 <br /> t ND means Not Detected <br /> Reporting Limit(RL)=Practical Quantitation Limit(PQL)x Dilution Factor <br />