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Sequoia 680 Chesapeake Drive Redwood City CA 94063 (415) 364 9600 FAX(415) 364 9233 <br /> ID 404 N Wiget Lane Walnut Creek CA 94598 (510) 988 9600 FAX(510)988 9673 <br /> IWAF Analytical 819 Stnker Avenue Suite 8 Sacramento, CA 95834 (916) 921 9600 FAX(916)921 0100 <br />&PDS Services Client Project ID Tosco#0123, 1034 Central Ave,Tracy Sampled Jun 4, 1997 <br /> 2401 Stanwell Dr, Ste 300 Matrix Descnpt Water Received Jun 4, 1997 <br /> Concord, CA 94520 Analysis Method EPA 5030/8015 Mod /8020 Reported Jun 20, 1997 <br /> Attention Jarrel Crider First Sample # 706-0358 <br /> TOTAL PURGEABLE PETROLEUM HYDROCARBONS with BTEX DISTINCTION <br /> Sample Sample Purgeable Ethyl Total <br /> Number Description Hydrocarbons Benzene Toluene Benzene Xylenes <br /> pg/L Ng/L Mg/L Ng/L pg/L <br /> I <br /> 706-0358 U-1 92 15 054 10 37 <br /> 706-0359 U-2 72 1 4 ND 28 073 <br /> 706-0360 U-3 ND ND ND ND ND <br /> 706-0361 U-4 1,700 49 ND 270 43 <br />• <br /> Detection limits 60 050 050 050 0 50 <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 /> Olignature on File <br /> Alan B Kemp <br /> Project Manager Page 1 of 2 <br /> 7060358 MPD <1 n <br />