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Sequoia 680 Chesapeake Drive Redwood Cory,CA 94063 (415) 364 9600 FAX(415) 364 9233 <br /> 404 N Wiget Lane Walnut Creek CA 94598 (510) 988 9600 FAX(510)988 9673 <br /> Analytical 819 Sinker Avenue,Suite 8 Sacramento CA 95834 (916) 921 9600 FAX (916)921 0100 <br /> WDS Services Client Project ID Unocal#5098 5606 Pacific Ave,Stockton Sampled Sep 16, 1997 <br /> 2401 Stanwell Dr, Ste 300 Matrix Descript Water Received Sep 16, 1997 <br /> Concord, CA 94520 Analysis Method EPA 5030/8015 Mod /8020 Reported Oct 8, 1997 <br /> Attention Jarrel Crider First Sample # 709-1413 <br /> TOTAL PURGEABLE PETROLEUM HYDROCARBONS with BTEX DISTINCTION <br /> Sample Sample Chromatogram DL Mult Date Instrument Surrogate <br /> Number Description Pattern Factor Analyzed ID Recovery, % <br /> QC Limits <br /> 70-130 <br /> 709-1413 MW-10 -- 10 9/27/97 HP-5 114 <br /> 709-1414 MW-11 Gasoline 200 9/29/97 HP-2 104 <br /> 709-1415 MW-12 Gasoline& 1 0 9/29/97 HP-5 112 <br /> Unidentified Hydrocarbons <br /> cC7A <br /> 709-1416 MW-13 -- 10 9/30/97 HP-4 104 <br /> 709-1417 MW-14 -- 10 9/29/97 HP-5 117 <br /> 709-1418 MW-15 -- 10 9/29/97 HP-5 118 <br /> 709-1419 MW-16 -- 10 9/29/97 HP-5 117 <br /> 709-1420 MW-17 -- 10 9/29/97 HP-5 123 <br /> SEQUOIA ANALYTICAL, #1271 Please Note <br /> Unidentified Hydrocarbons <C7 refers to unidentified peaks in the EPA 8010 range <br /> 0gnature on File <br /> Alan B Kemp <br /> Project Manager Page 2 of 2 <br /> 7091413 MPD <2� <br />