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Table 2 <br /> Ozone Injection Groundwater Monitonng Data <br /> ConocoPhdhps Service Station#6981 <br /> 4707 Pacific Avenue Stockton California <br /> Monitonng Well MW-16 Monttonn Well VW-7 <br /> Ethyl- Xylenes Ethyl Xylenes <br /> Notes ORP DO TPHg Benzene Toluene benzene (total) MtBE ORP DO TPHg Benzene Toluene benzene (total) MtBE <br /> Date mV IL (pQ1) (WgA) (NgAl (pgn) (PGO) (w) mV 11 (WgA (PgA) (po (pgn) (ow) <br /> 6/25/2003 a — 220 24 0 57 3 2 5 6 43 14,1500 77 110 210 1,100 <20 <br /> 7/22/2003 a — — 170 27 0 53 2 8 8 2 31 — 31500 35 37 59 330 <20 <br /> 8122/2003 a 160 23 0 63 2 9 8 7 26 2,200 19 9 6 38 43 <2 0 <br /> 9/26/2003 — — 230 34 0 67 4 6 8 6 32 15,000 53 47 290 1,300 <50 <br /> 10/3112003 -63 — 190 22 .24 4 0 78 17 -91 — 12,000 13 36 170 610 <5 0 <br /> 11/2512003 b — 130 17 <0 50 3 0 52 14 -85 -- 6,200 8 4 19 110 180 <10 <br /> 12117/2003 b - 4,100 9 6 16 79 19 <10 b — 83 9 4 <0 50 17 31 12 <br /> 1/9/2004 b — 110 13 <0 50 1 5 3 7 15 -55 -- 7,900 4 6 15 110 410 <10 <br /> 211212004 b 87 5 3 <0 50 13 31 9 7 b — 10,000 8 0 19 230 290 <10 <br /> 3/31/2004 b — 51 2 2 <0 50 0 50 16 4 3 -95 — 7,700 5 7 13 180 270 <50 <br /> 4/23/2004 b 5 85 <50 1 5 <0 50 <0 50 <1 0 2 8 b 2 87 6,400 4 8 7 6 120 13 <2 5 <br /> 5/19/2004 b 608 71 41 <0 50 0 87 1 6 4 5 b 569 4,300 5 5 6 5 <2 5 <5 0 <2 5 <br /> 6/16/2004 b 588 120 12 <0 50 3 5 58 97 b 5 52 5,300 4 5 63 110 6 5 <25 <br /> 7/29/2004 b 1 15 130 140 <0 50 3 2 52 69 b 2 50 5,400 63 9 6 110 37 <2 5 <br /> 8/19/2004 b 345 100 5 6 <0 50 <0 50 1 6 77 -86 383 5 300 5 7 8 9 76 8 <2 5 <br /> 9/16/2004 c — — — — -- — — -- -84 007 1,300 3 5 2 8 14 2 <0 50 <br /> 10/2812004 c — — — — — -- -- -64 228 2,000 1 1 2 6 32 24 <1 0 <br /> 11/3012004 d — — 110 51 <0 50 2 2 2 5 8 4 -68 341 3,200 23 41 73 6 4 <0 50 <br /> 12/34/2004 92 842 1 79 6 2 <0 50 23 3 3 8 6 -40 657 3,600 3 5 6 5 79 13 <1 0 <br /> 1/25/2005 b 765 55 4 5 <0 50 13 2 0 7 9 -64 6 54 6200 3 4 71 110 79 <1 0 <br /> 2111/2005 b 373 91 34 <0 50 12 19 1 7 5 -42 203 5,700 2 4 4 8 69 19 <2 5 <br /> 312212005 b 6 34 150 44 <0 50 1 7 27 10 -77 546 4,700 31 so 66 2 8 <1 0 <br /> 4/25/2005 b -- 69 1 3 0 <0 50 13 19 13 113 -- <50 <0 5 <0 5 <0 5 <1 0 <0 5 <br /> 5/11/2005 -24 535 220 23 1 <0 50 098 Is 10 110 5 21 67 <0 5 <0 5 <0 5 <1 0 <0 5 <br /> 6/2212005 116 655 <50 <0 50 <0 50 <0 50 <1 0 1 134 607 <50 <0 5 <0 5 <0 5 <1 0 <0 5 <br /> 7/13/2005 76 6 12 95 6 71 <br /> Definitions Notes <br /> TPHg Total petroleum hydrocarbons as gasoline a Sampled by Gettler Ryan Inc <br /> MtBE Methyl tert butyl ether b Reading is below the lower range of instrument,-99 <br /> µg1L Micrograms per liter c Well MW-16 is dry <br /> ORP Oxidation Reduction Potential d Well MW 16,enough water to sample,not enough to collect readings <br /> my Mdlwolts -- Data not available <br /> DO Dissolved Oxygen a Data not available at time of reporting <br /> mgn Milligrams perliter <br /> 11ConocoPhillips\Retail Sites1698110&m16981 RM&R Ozone Sparge Workbook As <br /> I <br />