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Sequoia 680 Chesapeake Drive Redwood City CA 94063 (650)364-9600 FAX(650)364-9233 <br /> 404 N Wlget Lane Walnut Creek.CA 94598 (9Z5)9S8-9600 FAX(925)988-9673 <br /> Analytical 819 Striker Avenue Suite 8 Sacramento CA 95834 (916)921-9600 FAX(916)921-0100 <br /> 1455 McDowell Blvd North Ste 0 Petaluma,CA 94954 (707)792-1865 FAX(707)792-0342 <br /> laler-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 # 903-0239 <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 1 D I D <br /> erg/L 903-0239 903-0240 903-0241 903-0242 903-0243 903-0244 <br /> MW-50, MW-5S MW-6D MW-6S MW-7D MW-7S <br /> Purgeabje <br /> Hydrocarbons 50 N D N D N D N D N D N D <br /> Benzene 0 50 N D N D N D N D N D N D <br /> Toluene 0 50 N D N D N D N D N D N D <br /> Ethyl Benzene 0 50 N D N D N D N D N D N D <br /> *Total Xylenes 050 N D N D N D N D N D N D <br /> MTBE 25 ND 39 15 55 ND ND <br /> Chromatogram Pattern - -- -- - - - <br /> Quality Control Data <br /> Report Limit Multiplication Factor 1 0 1 0 1 0 1 0 1 0 1 0 <br /> Date Analyzed 3/10/99 3/10/99 3/10/99 3/9/99 3/9/99 3/9/99 <br /> Instrument Identification HP-2 HP-2 HP-2 HP-5 HP-9 HP-9 <br /> Surrogate Recovery, % 106 106 110 91 94 95 <br /> (OC Limits = 70-130%) <br /> Purgeable Hydrocarbons are quantitated against a fresh gasoline standard <br /> Analytes reported as N 0 were not detected above the stated reporting limit <br /> SEQU�OIIA�A�,NA�LYTICAL, #1271 <br /> �fuu—' WUIG�.(.. <br /> u anne Fegley <br /> roject Manager <br /> 9030233 GET <2> <br />