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Sequoia680 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 /> Analytical 819 Sinker Avenue,Suite 8 Sacramento,CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> qII� <br /> 408 Services Client Project ID Tosco#0187 437 E Miner Ave,Stockton Sampled May 1, 1997 <br /> 2401 Stanwell Dr , Ste 300 Matrix Descript Water Received May 1, 1997 <br /> Concord, CA 94520 Analysis Method EPA 5030/8015 Mod /8020 Reported May 13, 1997 <br /> Attention Jarrel Crider First Sample # 705-0162 <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 pg/L pg/L pg/L pg/L <br /> 705-0162 U-1 310 49 ND ND 072 <br /> 705-0163 U-2 58 089 ND ND ND <br /> 705-0164 U-3 19,000 1,100 660 1,200 5,000 <br /> 705-0165 U-4 77 ND 089 ND 23 <br /> 705-0166 U-5 ND ND ND ND ND <br /> 705-0167 U-6 ND ND ND ND ND <br /> 705-0168 U-7 120 052 098 084 065 <br /> 705-0169 U-8 ND ND ND ND ND <br /> etection Limits 50 0 50 050 0 50 0 50 <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 /> 4bnature on File <br /> Alan B Kemp <br /> Project Manager Page 1 of 2 <br /> 7050162 MPD <1 <br />