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Sequoia680 Chesapeake Drive 64 <br /> Redwood City CA 94063 (650)3 -9600 FAX(650)364-9233 <br /> 404 N Wlget Lane Walnut Cr,es�w C,�A 94598_) (925)9a8-9600 FAX(925)988-9673 <br /> Analytical 819 Striker Avenue Suite 8 Sacramento' YJV 95834 (9t6)92 �50Q FAX(916)921-010 0 <br /> 1455 McDowell Blvd North Ste D Petaluma t A 9,054 (707)-1941 5 FAX(707)792-0342 <br /> Weftlei'-Ayan-Dublin Client project It) Tosco 8S#6981,Stockton Sampled Jul 21, `1998 <br /> 6747 Sierra Court, Suite J Sample Matrix Water ,Received Jul 22, 1998 <br /> ' Dublin, CA 94568 Analysis Method EPA 5030/801,5 Mod /8020 Reported Aug 11, 1998 <br /> Attention Deanna Harding First Sample # 807-1520 L�, i , , ,; _ d <br /> A v A Y vv f` v. INC. <br /> x.-31 9 i N_6%"-TO\s <br /> TOTAL PURGEABLE PETROLEUM HYDROCARBONSWth BTEX/ MTBE <br /> Reporting Sample Sample Sample Sample Sample Sample <br /> Analyte Limit LD I D 1.11) 1 D I.D. I D <br /> pg/L 807-1520 807-1521 807-1522 807-1523 807-1524 807-1525 <br /> TB-LB MW-1 MW-2 MW-4 MW-5 MW-6 <br /> Purgeable <br /> Hydrocarbons 50 N D 57 490 N D N D N D <br /> Benzene 050 N D 2 2 85 N D N D N D <br /> Toluene 050 N D 098 56 18 2 0 0 70 <br /> Ethyl Benzene 050 N D N D 29 N D N D N D <br /> Total Xylenes 050 N D 1 7 24 23 21 0 70 <br /> MTBE 50 N D 34 220 18 50 N D <br /> Chromatogram Pattern -- Gasoline Gasoline <br /> Quality Control Data <br /> Report Umlt Multiplication Factor 10 10 40 1 0 1 0 1 0 <br /> Date Analyzed 8/3/98 8/3/98 8/4/98 8/3/98 8/3/98 8/3/98 <br /> Instrument Identification HP-9 HP-9 HP-2 HP-9 HP-9 HP-9 <br /> Surrogate Recovery, % 97 100 125 99 97 96 <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 /> SEQUOIA ANALYTICAL, #1271 <br /> OXWX414�4"_ -11* <br /> lanne Fegley <br /> Project Manager <br /> 8071520 GET <1> <br />