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Table B-2 Ozone Injection-Groundwater Monitoring Data ConocoPhillips Service Station 0981 4707 Pacific Avenue Stockton,California MonitoringWeil MW-16 MonitoringWell VW-7 Ethyl- Xylenes Ethyl- Xylenes ORP DO TPHg Benzene Toluene benzene (total) MtBE ORP DO TPHg Benzene Toluene benzene (t'ene MtBE Date m m A (Nam (Vg") (Vgn) (11911) (Ngn) (Vgn) m m I! (11911) (Pg11) (Us11) (11911) (11g1) (11g11) 6/25/2003 a 220 24 0 57 32 5 6 43 - 14,000 77 110 210 1,100 <20 7/22/2003 a 170 27 053 28 8 2 31 3,500 35 37 59 330 <20 6/22/2003 a 160 23 063 29 8 7 26 2,204 19 9 6 38 43 <2 0 9/26/2003 230 34 067 46 8 6 32 -- 15,000 53 47 290 1,300 <50 10/3112003 -63 190 22 24 40 7 8 17 -91 12,000 13 36 170 610 <5 0 11!2512003 b 130 17 <0 50 30 5 2 14 -85 6,200 8 4 19 110 180 <10 12/17/2003 b 4,100 9 6 16 79 19 <10 b 83 9 4 <0 50 17 31 12 1/9/2004 b 110 13 <0 50 15 3 7 15 -55 - 7,900 46 15 110 410 <10 2/1212004 b -- 87 5 3 <0 50 1 3 31 9 7 b 10,000 so 19 230 290 <10 3/31/2004 b 51 2 2 <0 50 0 5o 16 4 3 -95 - 7,700 67 13 180 270 <5 0 412312004 b 585 <50 16 <0 50 <0 50 <1 0 2 8 b 2 87 6,400 4 8 76 120 13 <2 5 5/1912004 b 608 71 41 <0 50 0 87 1 6 4 5 b 5 69 4,300 65 6 5 <2 5 <5 0 <2 5 6/1612004 b 5 88 120 12 <0 50 3 5 58 97 b 552 5,300 1 4 5 63 110 1 6 5 <2 5 7/2912004 b 1 15 130 140 <0 50 3 2 62 6 9 b 2 50 5,400 63 9 a 110 37 <2 5 8/19/2004 b 345 100 56 <0 50 <0 50 16 7 7 -86 3 83 5,300 5 7 8 9 76 8 <2 5 9/16/2004 c - -- -84 007 1,300 3 5 2 8 14 2 <0 50 10126!2004 c - -- -- -64 228 2,000 1 1 2 6 32 24 <1 0 11/30/2004 d -- -- 110 51 <0 50 22 25 1 8 4 -68 1 341 3,200 2 3 41 73 64 m<O5O12/30/2004 92 842 79 62 <0 50 23 33 8 6 -40 6 57 3,600 35 6 5 79 13 Definitions Notes TPHg Total petroleum hydrocarbons as gasoline a Sampled by Gettler-Ryan Inc MtBE Methyl tert-butyl ether b Reading is below the lower range of instrument -99 µg11 Micrograms per liter a Well MW-16 is dry ORP Oxidation Reduction Potential d Well MW-16,enough water to sample,not enough to collect readings mV Millivolts -- Data not available DO Dissolved Oxygen mgA Milligrams perliter