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680 Chesapeake Drive Redwood City CA 94063 (650)364-9600 FAX(650)364-9233 <br /> Sequoia 404 N Wlget Lane Walnut Creek CA 94598 (925)988-9600 FAX(925)988-9673 <br /> 819 Sinker Avenue Suite 8 Sacram� 9 3 (916)921-9600 FAX(916)921-0100 <br /> FAX(707)79Z <br /> Analytical f$55McDowell <br /> ndus ri`llRoad North Ste D San(C"1 9 1 865 FAX(650)232-9612 <br /> 21 �6W <br /> etettler-Ryvan- Dublin Client project ID Unocal 85#2859, Stocktor�U O Sampled May 24 , 1999 <br /> 6747 Sierra Court, Suite J Sample Matrix Water Wcelved May 24, 1999 <br /> Dublin, CA 94568 Analysis Method EPA 5030/801542 Reported May 28, 1999 <br /> Attention Deanna Harding First Sample# 905-2028 (- R-RYAN JP4C* <br /> GENERAL CONTRACTOR <br /> TOTAL PURGEABLE PETROLEUM HYDROCARBONS with BTEX/ MT1B9 <br /> Reporting Sample Sample Sample Sample Sample Sample <br /> Analyte Limit I D I D I D 10 I.D I D <br /> ,ug/L 905-2028 905-2029 905-2030 905-2031 905-2032 905-2033 <br /> TB-LB MW-1 MW-2 MW-3 MW-4 MW-5 <br /> Purgeable <br /> Hydrocarbons 50 N D N D 33,000 N D N D N D <br /> Benzene 0 50 N D N D 4,900 N D N D N D <br /> Toluene 0 50 N D N D 2,500 N D N D N D <br /> Ethyl Benzene 050 N D N D 1,800 N D N D N D <br /> otal Xylenes 050 N D N D 6 400 N D N D N D <br /> MTBE 25 N D N D 950 N D N D N D <br /> Chromatogram Pattern - - Gasoline - - <br /> Quality Control Data <br /> Report Limit Multiplication Factor 10 10 200 1 0 1 0 10 <br /> Date Analyzed 5/25/99 5/25/99 5/25/99 5/25/99 5/26/99 5/26/99 <br /> Instrument Identification HP-4 HP-4 HP-4 HP-4 HP-9 HP-9 <br /> Surrogate Recovery, % 90 91 80 98 94 90 <br /> (00 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 /> SEQUOIA ANALYTICAL, #1271 <br /> Ju anne Fegley <br /> oject Manager <br /> 9052028 GET <1 i <br /> r9% <br />