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Table B-2 Ozone Injection-Groundwater Monitoring Data ConocoPhillips Service Station#6981 4707 Pacific Avenue,Stockton,California MonitoringWeil MW-16 Monitonn Well VW-7 Ethyl- Xylenes Ethyl- Xylenes ORP DO TPHg Benzene Toluene benzene (total) MtBE ORP 00 TPHgt (PV1 enzene Toluene benzene (total) MtBE m m Date n (Ngo) (tJgn) (ugn) (ugn) W) (Pgm m m A (Pgn) (PA I (PgA) (ugn) (P9A) 6/25/2003 a — — 220 24 0 57 32 56 43 -- 14 000 77 110 210 1,100 <20 7/22/2003 a — 170 27 053 28 82 31 — — 3 500 35 37 59 330 <20 8/22/2003 a — — 160 23 063 2 9 8 7 26 — — 2,200 19 9 6 38 43 <2 0 9/26/2003 — — 230 34 067 4 6 8 6 32 — — 15 000 53 47 290 1 300 <50 10/31/2003 -63 190 22 2 4 4 0 7 8 17 -91 — 12,000 13 36 170 610 <5 0 11/25/2003 b — 130 17 <0 50 3 0 5 2 14 -85 — 6200 84 19 110 180 <10 12/17/2003 b — 4 100 96 16 79 19 <10 b 83 9 4 <0 50 17 3 1 12 1/9/2004 b 110 13 <0 50 15 3 7 15 -55 - 7,900 4 6 15 110 410 <10 2/12/2004 b 87 5 3 <0 50 13 3 1 9 7 b — 10 000 8 0 19 230 29D <10 3/31/2004 b 51 2 2 <0 50 0 50 16 4 3 -95 — 7 700 5 7 13 180 270 <50 4/23/2004 b 585 <50 1 5 <0 50 <0 50 <1 0 2 8 b 2 87 6 400 4 8 7 6 120 13 <2 5 5/19/2004 b 608 71 41 <0 50 0 87 16 4 5 b 1 569 4 300 5 5 6 5 <2 5 <5 0 <2 5 6116/2004 b 588 120 12 <0 50 3 5 58 9 7 b 5 52 5,300 4 5 6 3 110 6 5 <2 5 7/29/2004 b 1 15 130 140 <0 50 3 2 52 6 9 b 2 50 5 400 6 3 96 110 37 <2 5 8/19/2004 b 345 100 5 6 <0 50 <0 50 16 7 7 -86 383 5,300 5 7 8 9 76 8 <2 5 9/16/2004 c c c c c c c c -84 0 07 1 300 3 5 2 8 14 2 <0 50 Definitions Notes TPHg Total petroleum hydrocarbons as gasoline a Sampled by Gettler-Ryan,Inc WE Methyi ler!-butyl ether b Reading is below the lower range of instrument -99 µg11 Micrograms per liter c Well MW-16 is dry ORP Oxidation Reduction Potential — Data not available mV Millivolts DO Dissolved Oxygen mgR Milligrams perliter