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r y <br /> Sequoia 680 Chesapeake Drive Redwood City CA 94063 (650)364-9600 FAX(650)364-9133 <br /> 404 N Wiger Lane Walnut Creek,CA 94598 (925)988-9600 FAX(925)988-9673 <br /> Analytical 819 Striker Avenue Suite s Sacramento CA 95834 (916)911-9600 FAX(916)921-0100 <br /> 1455 McDowell Blvd North Ste D Petaluma CA 94954 (707)792-11365 FAX(707)792-0341 <br /> ettler-Ryan - Dublin Client Project ID Unocal SS#5886, Stockton Sampled Mar 1, 1999 <br /> 6747 Sierra Court, Suite J Sample Matrix Water Received Mar 2, 1999 <br /> Dublin, CA 94568 Analysis Method EPA 5030/8015 Mod /8020 Reported Mar 24, 1999 <br /> Attention Deanna Harding First Sample # 903-0233 <br /> TOTAL PURGEABLE PETROLEUM HYDROCARBONS with BTEX / MTBE <br /> Reporting Sample Sample Sample Sample Sample Sample <br /> Analyte Limit I D I D I D I D I D I D <br /> lig/L 903-0233 903-0234 903-0235 903-0236 903-0237 903-0238 <br /> TB-LB MW-1 MW-2 MW-3 MW-4D MW-4S <br /> Purgeable <br /> Hydrocarbons 50 N D N D 9,300 N D N D N D <br /> Benzene 050 N D N D 57 N D N D N D <br /> Toluene 050 N D N D 470 N D N D N D <br /> Ethyl Benzene 050 N D N D 410 N D N D N D <br /> STotal Xylenes 050 N D N D 1 500 N D N D N D <br /> MTBE 25 N D 520 710 27,000 46 39 <br /> Chromatogram Pattern -- Gasoline - <br /> Quality Control Data <br /> Report Limit Multiplication Factor 10 1 0 100 1 0 1 0 1 0 <br /> Date Analyzed 3/8/99 3/9/99 3/9/99 3/9/99 3/9/99 3/9/99 <br /> Instrument Identification HP-9 HP-2 HP-5 HP-5 HP-2 HP-2 <br /> Surrogate Recovery, % 97 96 95 95 100 105 <br /> (OC Limits = 70-130%) <br /> Purgeable Hydrocarbons are quantitated against a fresh gasoline standard <br /> Analytes reported as N D were not detected above the stated reporting limit <br /> SEQUOIA ANALYTICAL, #1271 <br /> u le nne Peg Y <br /> roject Manager <br /> 9030233 GET a 1> <br />