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15) Sequoia 680 Chesapeake Drive Redwood City 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 /> qwr Analytical 819 Straker Avenue Suite 8 Sacramento,CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> *PDS Services Client Project ID Unocal#5098,5606 Pacific Ave ,Stockton Sampled Sep 16, 1997 <br /> 2401 Stanwell Or, Ste 300 Matrix Descrlpt 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 Purgeable Ethyl Total <br /> Number Description Hydrocarbons Benzene Toluene Benzene Xylenes <br /> fig/L !1g/L Fig/L pg/L pg/L <br /> 709-1413 MW-10 ND ND ND ND ND <br /> 709-1414 MW-11 50,000 15,000 1,100 720 7,700 <br /> 709-1415 MW-12 250" 1 8 054 059 14 <br /> 709-1416 MW-13 ND ND ND ND ND <br /> • 709-1417 MW-14 ND NO ND ND NO <br /> 709-1418 MW-15 ND ND ND ND ND <br /> 709-1419 MW-16 ND NO ND ND ND <br /> 709-1420 MW-17 ND ND ND ND ND <br /> Hydrocarbons detected appeared to be a gasoline and non-gasoline mixture <br /> Detection Limits 50 050 050 050 050 <br /> Total Purgeable Petroleum Hydrocarbons are quantitated against a fresh gasoline standard <br /> Analytes reported as ND were not present above the stated limit of detection <br /> SEQUOIA ANALYTICAL, #1271 <br /> 0gnature on File <br /> Alan B Kemp <br /> Project Manager Page 1 of 2 <br /> 7091413 MPD <1> <br />