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Sequoia 680 Chesapeake Drive Redwood City CA 94063 (415) 364 9600 FAX(415) 364 9233 <br /> 404 N Wtset Lane Walnut Creek,CA 94598 (510) 988 9600 FAX(510)988 9673 <br /> Analytical 8t9 StrtkerAvenue,Suite 8 Sacramento CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> GPDS Services Client Project ID Unocal#0123, 1034 Central Ave ,Tracy Sampled Mar 3, 1997 <br /> 2401 Stanwell Dr, Ste 300 Matrix Descript Water Received Mar 3, 1997 <br /> Concord, CA 94520 Analysis Method EPA 5030/8015 Mod /8020 Reported Mar 19, 1997 <br /> Attention Jarrel Crider First Sample # 703-0493 <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 Ng/L Fig/L pg/L Ng/L <br /> 703-0493 U-1 ND 081 ND 053 ND <br /> 703-0494 U-2 170 21 058 15 091 <br /> 703-0495 U-3 ND ND ND ND ND <br /> 703-0496 U-4 6,400 99 15 690 250 <br /> • <br /> Detection Limits so 0 50 050 050 056 <br /> Total Purgeable Petroleum Hydrocarbons are quantitated against afresh gasoline standard <br /> Analytes reported as ND were not present above the stated limit of detection <br /> SEQUOIA ANALYTICAL, #1271 <br /> anature on File <br /> Alan B Kemp <br /> Project Manager Page 1 of 2 <br /> 7030493 MPD <1> <br />