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TableB-2 Ozone Injection-Groundwater Monitoring Data 76(Former BP)Station No. 11195 16500 Interstate 5 South, Lathrop,California Monitoring Well:MW-3 MonitoringWell:MW-10 Ethyl- Xylenes Ethyl- Xylenes ORP DO TPHg Benzene Toluene benzene (total) MtBE ORP DO TPHg Benzene Toluene benzene (total) MtBE Date m (mg/1) (ugn} (ugn} W! (NgT (pg/4 (Pn m m 11 (Wgll) (Vgr) (ue+i) (Nell) MID (ugr) 11/18/2002 a <500 <5.0 <5.0 <5.0 <10.0 1,300 - - <500 <5.0 <5.0 <5.0 <10 860 211312003 a <500 <5.0 <5.0 <5.0 <10.0 1,500 -- - <50 <0.50 <0.50 <0.50 <1.0 53 3/21/2003 a -- -- 320 <0.50 <0.50 <0.50 <0.50 1,700 - - <50 <0.50 <0.50 <0.50 <1.0 5.1 4/22/2003 a -- 6,700 <2.5 <2.5 <2.5 <2.5 4,400 -- <50 <0.50 <0.50 <0.50 <0.50 <0.50 5112/2003 a <1000 <10 <10 <10 <20 1,300 <50 <0.50 <0.50 <0.50 <1.0 <2.0 6/20/2003 a - 140 <0.50 <0.50 <0.50 <0.50 180 <50 <0.50 <0.50 <0.50 <0.50 1.5 9/23/2003 - - 11,000 <50 <50 <50 1 <50 13,000 1 <50 <0.50 <0.50 <0.50 1 <0.50 <5.0 10/31/2003 - -- <5000 1 <50 <50 <50 <100 6,700 <50 <0.50 2.4 <0.50 2.0 0.60 1/20/2004 100 -- 630 <5 <5 <5.0 <10 1,100 142 <50 <0.50 <0.50 <0.50 <1.0 <2.0 2/27/2004 105 <250 <2.5 <2.5 <2.5 <5.0 300 137 - <50 <0.50 <0.50 <0.50 <1.0 11 3/31/2004 68 220 <1.0 <1.0 <1.0 <2.0 270 128 - <50 <0.50 <0.50 <0.50 <1.0 <0.50 4/27/2004 b 93 1.45 1300 <10 <10 <10 <20 1,200 90 2.39 <50 <0.50 <0.50 <0.50 <1.0 <0.50 5/25/2004 54 6.46 1600 <10 <10 <10 <20 11600 56 6.49 <50 <0.50 <0.50 <0.50 <1.0 <0.50 6/16/2004 37 5.46 760 <2.5 <2.5 <2.5 <5.0 850 87 6.45 <50 <0.50 <0.50 <0.50 <1.0 <0.50 7/6/2004 15 6.47 260 1.9 <1.0 <1.0 <1.0 210 1 94 5.97 <50 <0.50 <0.50 <0.50 <1.0 <0.50 8/9/2004 -9 5.67 120 <0.50 <0.50 <0.50 <1.0 120 94 5.93 <50 <0.50 <0.50 <0.50 <1.0 <0.50 9/23/2004 -39 t 200 <1.0 <1.0 <1.0 <2.0 180 51 c 70 <0.50 <0.50 <0.50 <1.0 S.0 10122!2004 -51 1.89 110 1 <0.50 <0.50 <0.50 <1.0 94 47 3.40 <50 <0.50 <0.50 <0.50 <1.0 <0.50 11/5/2004 6 2.67 1 188 <1.0 I <1.0 <1.0 <2.0 130 56 3.94 <50 <0.50 <0.50 <0.50 <1.0 0.97 12/2/2004 b 99 6.75 330 <1.0 <1.0 <1.0 <2.0 330 102 5.15 71 <0.50 <0.50 <0.50 <11.0 1.1 Definitions: Notes: TPHg=Total petroleum hydrocarbons as gasoline a =Sampled by Gettler-Ryan,Inc. MtBE=Methyl tert-butyl ether b =Hydrocarbon in gasoline range does not match laboratory gasoline standard. pglL=Micrograms per liter c =No data due to meter malfunction µgll=Micrograms per liter -- =Data not available ORP=Oxidation Reduction Potential my=Milivolts DO=Dissolved Oxygen mgll=Miligrams per liter