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SIERRA LABORATORIES INC <br /> GHH Engineering,Inc. Date Sampled: 01/08/02 <br /> 11960 Heritage Oak Pl,Suite 2B Date Received: 01/11/02 <br /> Auburn,CA 95603 Date Prepared: 01/17/02 <br /> Date Analyzed: 1117-1/18/02 <br /> Sierra Project No.: 0201-122 Analyst: MW <br /> Client Project ID: USA-Stockton/5007.10 <br /> Sample Matrix: Water Report Date: 01/18/02 <br /> EPA METHOD 8026-BTEXIEPA METHOD 8015-Gasoline Range Hydrocarbons(C4-C12) <br /> (Purge S Trap) <br /> Concentration,ug/l <br /> Practical <br /> Client Sample No.: MW-1P MW-2P MW-3P MW-4P MW-5P MW-6P MW-I MW-2 Quantitation <br /> Limit, <br /> Sierra Sample No.: 733 734 735 1 736 737 738 739 740 <br /> ug/l <br /> COMPOUNDS: <br /> Benzene ND 49 ND ND ND ND 0.77 ND 0.5 <br /> -- ------- - __ _ ..-_.._—._._..._--.. --- '--_ -._ .. _... - <br /> Toluene 1.6 13 9.6 ND ND <br /> ND ND ND 0.5 <br /> Ethylbenzele ND 0.87 1.0 ND --ND----ND ND -- ND --- — -0.5 <br /> Total Xylenes ND 4.3 8.0 ND ND - ND ND ND -_ 0.5 <br /> MTBE ND 100 32 ND ND ND 27 ND 5.0 <br /> asoline 70 1300 1200 ND ND ND 270 76 50 <br /> Dilution Factor JQC Limits <br /> Surrogate Recovery: 106 120 117 119 95 70 114 90 70.125 <br /> Quality Assurance/Quality Control Data <br /> 1QC Sample ID: 020117-Blank <br /> LCS Splice Spike Dup QC QC <br /> Compounds %, Rec. `%.Rec. '%, Rec. Limits RPD Limits <br /> Benzene 104 97 78 39-15O 22 0-30 <br /> Toluene 97 — 1 75 ----46-I48 - - - - -20 0-30 - <br /> Ethylbenzene 97 97 76 32-160 - 15-- - 0-30 <br /> Gasoline 98 ----- 91--- - ----- -- 83 u50-I50 9.9-- - 0-3b <br /> ND moans Not Detected <br /> Reporting Limit(RL)-Practical Quantitation Limit(PQL)x Dilution Factor <br />