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TABLE 4 Groundwater Analytical Results-Water Chemistry 102 South Wilson Way Stockton,CA Total BrO Date 3Ve11ID Well Zuce DO ORP EC pH Temp Hardness TDS Alkaliidty Cr" Br' NO, 50,' (millivolts) (u:ME /cn0 (°C) (PPm) (➢Pm) m 'Cr- (PPm) (ClPPm) (pp-) (Ppm) (ppm) Baseline Groundwater Monitoring Weil Analytical Results 911,10 MWI Backwound 0.5 28 1,300 6.8 21.5 450 870 460 10.20 <L0 66 12.5 16 10.050 MW2 Transition 0.4 83 1400 6.7 22.2 430 900 550 10.20 <I.0 200 8.1 27 N.O50 MW5 Transition 0.5 .132 1400 6.8 22.8 450 910 600 <0.20 <I.0 1 230 1 1.5 1 2.3 It10.050 MW6 Back ound 0.8 132 1011 7.2 22.2 490 1100 l80 10.20 <I.0 260 22 35 0.40 MW8 Com lance 0.4 -100 960 7.0 21.9 240 560 270 <0.20 <I.0 140 Q.5 6.2 0.50 MW 12 Co. fiance 0.4 124 1 00 6.8 20.6 370 800 490 10.30 q.0 130 4.0 41 c0.050 MW13B Transition 0.5 -113 1800 6.8 23.1 600 1500 410 10.20 3.3 560 Q.5 4A 0.50 Baseline Vapor Extraction Well(Injecdou Well Analytical Results 8/12110 VWI Treaunent 0.6 -114 1,300 6.6 22.9 370 820 560 10.20 <L0 38 l.0 0.87 10.050 VW2 Treabnent 04 -140 1,600 6.6 23.0 Mal 1100 810 10.20 3.6 94 4.6 I] <q.050 VWb Treatrnent 0.5 -85 1500 6.6 23.1 460 1000 540 10.20 <IO 200 Q.5 4.2 '0.050 Analytical Remlts Afler First Peroxide Injection 12/23/10 VWI Tr'aMent ZS 22 140 ].0 2J.9 100 140 130 0.56 10.10 2.9 <0.50 13 1(.050 VW2 Treaonent 13.9 2.0 590 7.4 22.8 180 280 230 1.2 <uA0 11 0.51 17 10.050 VW6 treatment - - - - AnalytouL Results After Second Peroxide Injection 2/2/11 MWl Back ound 0.9 48 1,279 7.1 21.6 580 990 320 '0.20 <0.50 260 <2.5 21 10.005 MW2 Transition 0.8 -163 1725 7.0 20.1 670 960 520 10.20 <L0 160 <5.0 <5.0 <0.005 MW5 Transition 1.2 -197 1 50 7.1 18.9 b00 950 560 10.20 10.50 160 ¢.5 Q.5 10.005 MW6 Back ound 1.9 45 1 25 7.2 21.8 600 980 460 <0.20 11U 41 9.9 Il co.005 M Co. Bance 0.8 -247 1.935 7.1 19A Sl0 1,000 480 <0.20 10.50 210 12.5 Q.5 10.005 MW12 Com Dance 2.4 47 1410 7.5 20A 500 850 500 <0.20 <0.50 120 14 65 10.005 MW13B Transition 0.8 -227 1.924 7.1 32.3 690 1100 420 <0.20 <0.50 200 12.5 12.5 10.005 MW 15B Cont fiance 0.4 -55 1820 ].2 21.4 600 1100 360 <T20 <0.50 48 3.7 68 10.005 Vapor Extraction Wen(Injection Well)Analytical Results after Second Peroxide Injection 2/2/11VWI Treatment 20 138 422 7.4 23.8 260 500 350 0.30 10.10 9.0 0.60 12 <0.W VW2 Trea�ent 20 66 989 7.7 23.2 290 1 530 350 7.3 1 <0.10 37 12 29 '0.005 "- Vapor Extraction W ell(Injection W ell)Analytical Resuls after Third Peroxide Injection 3/28/11 VWI Treavnent 1.8 81 260 6.9 22.8 89 1 140 1 80 1 <0.20 10.10 8.0 2.8 5.9 <0.010 VW2 Treatrvmt 0.4 -19 600 1 7.0 1 21.4 1 250 1 240 1 240 1 O.35 10.10 21 5.3 10 <0.010 VW6 Treatment ." _ _ I _ _ - _ _ I _ Vapor Extraction(Injection Well)and I leansition Zone Monitoring Well Analytical Results after Fifth Peroxide briecliov 5/1]/II VWI Treannem 11.3 80 720 6.9 22.4 280 380 300 10.20 <0.20 21 <1.0 16 0.53 VW2 Treatrnent 17.6 98 700 7.1 1 22.0 280 1 380 260 1 4.1 1 10.20 29 4.8 21 0.35 it VW6 Treavnenl _ _ _ MW2 Transition 0.8 10 1400 6.7 20.8 570 1 920 1480 '0 <0.20 250 11.0 2.6 10.10 MWS Transition 0.6 34 1,400 6.8 21.7 560 900 V., 10.20 <0.20 210 11.0 2.1 <0.10 IMW13BI Transition 1 1.0 78 1 690 6.6 1 20.6 200 1 430 1 180 1 U. 10.20 71 50 23 0.46 Notes: DO =Dissolved Oxygen(messueed by field instrument on 9/3/10) SO,' =Sulfate by EPA Method 300.0 ORP =Oxydalion reduction Potential(measured by field instrument on 9/3/10) BrOj =Bromate by EPA Method 300.1 EC =Electrical Condcetivity by EPA Method 120.1 ppm =pans per milfion pH =Measured by SM 4500-H+B ppb =pans per billion Temp =Temptta[ore(measured by field instrument) umluwmn =unit of electrical conductivity TOS =Total dissolved solids by EPA Method 160.1 Cy' -Chromium VI by EPA Method 218.6 B( =Bromide by EPA Method 300.0 CF =Chloride by EPA Method 300.0 NO; =Nitrate by EPA Method 300.0