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Table 2 Ozone Injection Groundwater Monitoring Data Circle K Store No 11192 1403 Country Club Blvd Stockton California Monitonng Well MW 3 Monj ring Well MW-4 Ethyl- Xylenes Ethyl Xylenes ORP DO TPHg Benzene Toluene benzene (total) MtBE TBA ORP DO TPI-Ig Benzene Toluene benzene (total) MtBE TBA Date mV m I (>,�s {uo�) (Ua�) (pgm (POA) (w) (U�) mV m !I (usu�) (ua�) (UgA) (Ugn) (UO) (U9nl {UeA1 11/15/2002 a <12 000 <120 <120 <120 <120 <500 180,000 150 <0 50 0 67 <0 50 064 150 <500 113/2003 a — <10000 <100 <100 <100 <100 <400 150,000 <50 <0 50 <0 50 <0 5D 1!3112003 a — <25 000 <250 <250 <250 <500 <1 000 160,000 <50 <0 50 <0 50 <0 50 <1 0 64 <100 291-9/2003 a — 3,300 <5 0 <5 0 <5 0 <10 280 -- — <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 3 7 4/2212003 a — — 220 <0 50 <0 50 <0 50 <0 50 15 - <50 <0 50 <0 50 <0 50 <0 50 2 1 — 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!2012003 a — 180 <0 50 <0 50 <0 50 <0 50 13 160,000 <50 <0 50 <0 50 <D 50 <0 50 43 18 7/22/2003 a — <5 D00 <50 <50 <50 <50 <200 110,000 65 <0 50 <0 50 <0 50 <0 50 39 140 9/26/2003 — 1,400 <1 0 <1 0 <1 0 <1 0 320 - <50 <0 50 <0 50 <0 50 <0 50 <60 - 10/31/2003 60 <25000 <250 <250 <250 <500 <250 - 206 c50 <0 50 2 5 0 51 2 6 c0 50 1 i12512003 7 <5000 <50 <50 <50 <100 <200 - 165 <50 <0 50 <0 50 <0 50 <1 0 <2 0 12/17/2003 — — <10000 <100 <100 <100 <200 <400 110,000 — <50 <0 50 <0 50 <0 50 <1 0 <2 D <100 1!20!2004 36 <5000 <50 <5D <50 <100 <200 99,000 166 — <50 <0 50 <0 50 <0 50 <1 0 81 <100 211212004 -- — <10000 <100 <100 <100 <200 <400 110,000 — — <50 <0 50 <0 50 c0 50 c1-0 3 9 <i00 3!3112004 -1 — <5000 <50 <50 <50 <100 <50 58,000 115 <50 <0 50 <0 50 <0 50 <1 0 3 4 <5.0 412312004 13 7 55 <5000 <50 <50 <50 <100 <50 69,000 64 6 49 <50 <0 50 <0 50 <0 50 <1 0 1 6 <5 0 5119/2004 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 14 594 <100000 <100 <100 <100 <200 <100 61,000 43 6 35 <50 <0 50 <0 50 <0 50 <1 0 <5 0 40. 7129/2004 30 441 <100 000 <100 <100 <100 <200 <100 77,000 55 4 78 <50 <0 50 <0 50 <0 50 <1 0 <50 1 6 8/19/2004 24 2 87 <5000 <50 <50 <50 <100 <50 57,000 16 369 c50 c0 50 <0 50 <0 50 c1 0 <5 0 1 2 9/16/2004 -58 0 09 <5000 <50 <50 <50 <100 <50 67,000 26 010 <50 <0 50 <0 50 <0 50 <1 0 <5 D 13 10/28/2004 25 2 09 <5000 <50 <50 <50 <100 <50 41,000 25 2 86 <50 <0 50 c0 50 <0 50 <1 0 c0 5 <5 D 11/30/2004 6 4 58 <5000 <50 <50 <50 <100 <50 51,000 35 368 <50 <0 50 <0 50 <0 50 <1 0 68 58 12/30/2004 1 D 03 <2500 <0 50 <0 50 <0 50 <1 0 <25 43,000 43 0 01 <50 <0 50 <0 50 <0 50 <1 0 <0 5 <S 0 1!25!2005 b c 58 7 53 <50 <0 50 <0 50 J <0 50 <1 0 0 91 37,000 69 686 <50 <0 50 <0 50 <0 50 <1 0 2 9 <5 0 2125/2005 20 5 58 <2500 <0 50 <0 50 <0 50 <1 D <25 37,000 31 645 <50 <0 50 <0 50 <0 50 <1 0 4 8 <5 0 3!2292005 53 657 <2500 <0 50 <0 50 <0 50 <1 0 <25 25,000 102 6-18 <50 <0 50 <0 50 <0 50 <1 0 16 <5 0 IL Definitions Notes TPHg=Total petroleum hydrocarbons as gasoline a Sampled by Gettler-Ryan Inc MtBE=Methyt tert-butyl ether - Data not available Ugrl=Micrograms per liter b MW 3 The concentration reported reflect(s)individual or discrete unidentified peaks not matching a typical fuel patte ORP=Oxidation Reduction Potential c MW-4 The concentration reported reflect(s)individual or discrete unidentified peaks not matching a typical fuel patte mV=Milivolts d Data not available at time of reporting DO=Dissolved Oxygen mg/l=Mi$igrams per liter