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! i i Table B 2 Ozone Injection Groundwater Monitoring Data 76(Former BP)Service Station#11192 1403 Country Club Blvd Stockton California Monitoring Well MW 3 Monitoring Well MW-4 Ethyl- Xylenes Ethyl Xylenes ORP DO TPHg Benzene Toluene benzene (total) MtBE TBA ORP 00 TPHg Benzene Toluene benzene (total) MtBE TBA Date mV m (ugri) (Pgt) (PO) (Pgn) (PQA) (Pgm (Pgn) mV Mg/ (w) (P9A) (Pgn) (P9A) Mal 00) WA) 11/15/2002 a — <12000 <120 1 020 <120 <120 <500 180,000 150 <0 50 0 67 <0 50 0 64 156 <500 1/3/2003 a <10 000 <100 <100 <100 <100 <400 150,000 <50 <0 50 <0 50 <0 50 <1 0 130 <500 1/31/2003 a — <25 000 <250 <250 <250 <500 <1 000 160,000 <50 <0 50 <0 50 <0 50 <1 0 64 <100 2/1912003 a — 3,300 <50 <50 <5 0 <10 260 -- <50 <0 50 <0 50 <0 50 <1 0 30 - 3/21/2003 a — 250 <0 50 <0 50 <0 50 <0 50 14 - <50 <0 50 <0 50 <0 50 <0 50 37 — 4/22/2003 a 220 <0 50 <0 50 <0 50 <0 50 15 — <50 <0 50 <0 50 <0 50 <0 50 21 — 5/14/2003 a — — <5 000 <50 <50 <50 <50 <200 120,000 — — <50 <0 50 <0 50 <0 50 <0 50 19 <500 6/20/2003 a — — 180 <0 50 <0 50 <0 50 <0 50 13 160,000 — <50 <0 50 <0 50 <0 50 <0 so 43 i8 7/22/2003 a — <5 000 <50 <50 <50 <50 <200 110,000 65 <0 50 <0 50 <0 50 <0 50 39 146 9/26/2003 — 1,400 <1 0 <1 0 <1 0 <1 0 320 — — <50 <0 50 <0 50 <0 50 <0 50 <5 0 — 10/31/2003 60 — <25000 <250 <250 <250 <500 <250 — 206 -- <50 <0 50 2 5 0 51 2 6 <0 50 — 11/25/2003 7 — <5000 <50 <50 <50 <100 <200 -- 165 — <50 <0 50 <0 50 <0 50 <1 0 <20 - 12/17/2003 - — <10000 <100 <100 <100 <200 <400 110,000 - <50 <0 50 <0 50 <0 50 <1 0 <2 0 <100 1/20/2004 -36 <5000 <50 <50 <50 <100 <200 99,000 166 <50 <0 50 <0 50 <0 50 <1 0 8 1 <100 2/1212004 -- <10000 <100 <100 <100 <200 <400 110,000 - — <50 <0 50 <0 50 <0 50 <1 0 3 9 <100 3/31/2004 -1 <5000 <50 <50 <50 <100 <50 58,000 115 <50 <0 50 <0 50 <0 50 <1 0 3 4 <50 4/23/2004 13 755 <5000 <50 <50 <50 <100 <50 69,000 64 649 <50 <0 50 <0 50 <0 50 <1 0 16 <5 0 5/19/2004 3 2 14 <100000 <100 <100 <100 <200 <100 67,000 67 4 96 <50 <0 50 <0 50 <0 50 <1 0 17 <5 0 6/21/2004 -14 5 94 <100000 <100 <100 <100 <200 <100 61,000 43 635 <50 <0 50 <0 50 <0 50 <1 0 <5 0 4 0 7/29/2004 -30 4 41 <100000 <100 <160 <100 <200 I <100 77,000 55 4 78 <50 <0 50 <0 50 <0 50 <1 0 <5 0 16 811912004 24 2 87 <5000 <50 <50 <50 <100 <50 57,060 16 369 <50 <0 50 <0 50 <0 50 <1 0 <50 12 9/16/2004 58 009 <5000 <50 <50 <50 <100 <50 67,000 26 0 10 <50 <0 50 <0 50 <0 50 <1 0 <5 0 13 1012612004 -25 209 <5000 <50 <50 <50 <100 <50 41,000 25 2 86 <50 <0 50 <0 50 <0 50 <1 0 <0 5 <5 0 11/30/2004 6 4 58 <5000 <50 <50 <50 <100 <50 51,000 35 3 68 1 <50 <0 50 <0 50 <D 50 <1 0 6 8 5 8 12!30!2004 1 003 <2500 <0 50 <0 50 <0 50 <1 0 <25 43,000 43 001 <50 <0 50 <D 50 <0 50 <1 0 <0 5 <5 0 Definitions Notes TPHg=Total petroleum hydrocarbons as gasoline a =Sampled by Gettler Ryan Inc MtBE=Methyl tert-butyl ether — =Data not available pg/I=Micrograms per liter ORP=Oxidation Reduction Potential MV=Milivolts DO=Dissolved Oxygen Mgt]=Miligrams per liter I lConwoPhdhpslRetad Sites%111921o&m\l 1192 RM&R Ozone Sparge workbook 4004 xis