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Sequoia 680 Chesapeake Drive Redwood City,CA 94063 (415) 364-9600 FAX(415) 364.9233 <br /> 404 N.WiSet Lane Walnut Creek,CA 94598 (510) 988.9600 FAX(510)988.9673 <br /> Analytical 819 Striker Avenue,Suite 8 Sacramento,CA 95834 (916) 921-9600 FAX(916)921.0100 <br /> DS Services Client project ID: Tosco #0788, 8203 . 11th $t.Tracy Sampled: May 61 1997 <br /> 2401 Stanwell Dr., Ste. 300 Matrix Descript: Water Received: May 6, 1997• <br /> Concord, CA 94520 Analysis Method: EPA 5030/8015 Mod./8020 Reported: May 23, 1997ii <br /> Attention: Jarrel Crider First Sample#: 705-0462 <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 /> 705-0462 U 1 -- 1.0 5-12-97 HP-5 113 <br /> 705-0463 U 2 -- 1.0 5-12-97 HP-5 120 <br /> 705-0464 U 3 1.0 5-12-97 HP-5 115 <br /> 705-0465 U 4 -- 1.0 5-12-97 HP-5 121 <br /> 705-0466 U 5 -- 1.0 5-12-97 HP-5 114 <br /> 705-0467 U 6 -- 1.0 5-12-97 HP-5 120 <br /> 705-0468 U 7 -- 1.0 5-12-97 HP-5 116 <br /> 705-0469 U 8 -- 1.0 5-12-97 HP-5 112 <br /> 705-0470 U 9 -- 1.0 5-12-97 HP-5 113 <br /> 705-0471 U10 -- 1.0 5-12-97 HP-5 116 <br /> SEQUOIA ANALYTICAL, #1271 <br /> nature on File <br /> Alan B. Kemp <br /> Project Manager Page 2 of 2 <br /> 7050462,MPD <2> <br />