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TABLE 4 FIELD PARAMETERS AND WELL DETAILS 2012 ANNUAL GROUNDWATER MONITORING REPORT FORMER MARLEY COOLING TOWER SITE STOCKTON,CALIFORNIA Field Parameters Top of Well Depth to Water Casing Groundwater Calc Dissolved Screened Water- Diameter Well Depth Water Column Elevation Elevation Purge Vol Purge Vol pH(standard EC Temp Oxygen ORP Well bearing Zone Sample Date Event/Purpose Sample Time (in) (ft-btoc) (ft-btoc) Length(ft) (ft-amsl) (ft-amsl) (gal) (gal) units) (pS/cm) (°C) (mg/L) (mV) Observations Injection Area Wells Continued 1/14/2008 Baseline 10:21 AM 4 80 54.55 25.45 27.14 -27.41 38.61 60 7.52 484 16.5 6.36 216 Clear,no odor 4/2/2008 2nd Qtr. 10:51 AM 4 80 54.27 25.73 27.14 -27.13 39.04 60 7.38 867 18.2 7.2 171 Clear,no odor 5/20/2008 Supplemental 12:26 PM 4 80 53.98 26.02 27.14 -26.84 54.86 60 7.22 747 19.3 1.6 87 Clear,no odor 7/11/2008 3rd Qtr. 12:52 PM 4 80 54.89 25.11 27.14 -27.75 53.08 60 7.24 1,118 20.0 4.1 138 Clear,no odor 10/22/2008 4th Qtr. 2:48 PM 4 80 57.25 22.75 27.14 -30.11 48.46 60 7.36 1,017 18.7 3.9 196 Turbid,no odor 1/9/2009 1 st Qtr. 3:26 PM 4 80 58.61 21.39 27.14 -31.47 45.79 60 6.67 1,071 18.1 2.9 31 Clear,rotten egg odor 4/7/2009 2nd Qtr. 8:06 PM 4 80 59.32 20.68 27.14 -32.18 44.40 60 7.27 1,129 18.2 2.5 53 Clear,no odor 7/14/2009 3rd Qtr. 4:21 PM 4 80 60.50 19.50 27.14 -33.36 42.09 60 7.23 1,157 20.3 1.7 78 Clear,no odor 10/12/2009 4th Qtr. 2:28 PM 4 80 62.00 18.00 27.14 -34.86 39.16 60 7.12 1,161 19.2 1.6 30 Clear,no odor MW-208 Shallow 2/1/2010 1st Qtr. 7:31 AM 4 80 62.02 17.98 27.14 -34.88 39.12 60 7.20 1,207 17.9 2.7 130 Turbid,no odor 4/14/2010 2nd Qtr. 10:46 AM 4 80 60.41 19.59 27.14 -33.27 42.27 60 6.99 1,192 18.2 1.6 83 Clear,no odor 7/8/2010 3rd Qtr. 8:20 AM 4 80 57.37 22.63 27.14 -30.23 44.31 60 7.07 1,167 18.9 1.6 31 Clear,no odor 10/13/2010 4th Qtr. 11:16 AM 4 80 55.91 24.09 27.14 -28.77 47.17 60 7.06 1,153 18.8 1.4 207 Clear,no odor 1/21/2011 1 st Qtr. 3:46 PM 4 80 55.61 24.39 27.14 -28.47 47.76 60 6.99 893 18.2 3.6 198 Clear,no odor 4/14/2011 2nd Qtr. 8:31 AM 4 80 53.78 26.22 27.14 -26.64 51.34 60 6.91 743 17.8 4.2 206 Clear,no odor 7/20/2011 3rd Qtr. 1:21 PM 4 80 52.01 27.99 27.14 -24.87 54.81 60 7.23 554 19.4 3.0 124 Clear,no odor 10/12/2011 4th Qtr. 6:26 PM 4 80 50.22 29.78 27.14 -23.08 58.31 60 7.62 448 18.3 3.1 225 Clear,no odor 1/25/2012 1 st Qtr. 3:21 PM 4 80 50.43 29.57 27.14 -23.29 57.90 60 7.17 492 18.2 1.1 282 Clear,no odor 4/24/2012 2nd Qtr. 1:21 PM 4 80 50.00 30.00 27.14 -22.86 58.74 60 7.17 516 18.4 5.4 188 Clear,no odor 1/9/2008 Baseline 3:33 PM 4 80 54.37 25.63 27.18 -27.19 54.10 60 7.58 614 18.2 7.96 188 Clear,no odor 4/2/2008 2nd Qtr. 11:03 AM 4 80 54.19 25.81 27.18 -27.01 37.45 60 7.43 907 19.2 7.2 181 Clear,no odor 7/11/2008 3rd Qtr. 8:47 AM 4 80 54.00 26.00 27.18 -26.82 53.06 60 7.40 1,027 19.8 8.7 70 Clear,no odor 10/22/2008 4th Qtr. 10:04 AM 4 80 57.14 22.86 27.18 -29.96 48.67 60 7.38 927 19.5 9.8 228 Clear,no odor 1/9/2009 1st Qtr. 11:42 AM 4 80 58.43 21.57 27.18 -31.25 46.15 60 6.98 971 19.3 7.0 74 Clear,no odor 4/7/2009 2nd Qtr. 8:51 AM 4 80 59.20 20.80 27.18 -32.02 44.64 60 7.36 1,034 19.9 7.1 103 Clear,no odor 7/15/2009 3rd Qtr. 8:40 AM 4 80 60.39 19.61 27.18 -33.21 42.31 60 7.35 1,118 20.9 10.6 159 Clear,no odor 10/12/2009 4th Qtr. 2:11 PM 4 80 61.81 18.19 27.18 -34.63 39.53 60 7.41 1,004 20.5 10.2 150 Clear,no odor 2/2/2010 1st Qtr. 12:11 PM 4 80 61.92 18.08 27.18 -34.74 39.31 60 7.40 1,168 19.0 8.5 235 Clear,no odor MW-300 Shallow 4/14/2010 2nd Qtr. 2:51 PM 4 80 60.21 19.79 27.18 -33.03 42.66 60 7.41 1,085 19.0 7.5 186 Clear,no odor 7/8/2010 3rd Qtr. 11:10 AM 4 80 57.14 22.86 27.18 -29.96 44.76 60 7.31 1,042 19.6 8.0 204 Clear,no odor 10/13/2010 4th Qtr. 2:21 PM 4 80 55.88 24.12 27.18 -28.70 47.23 60 7.49 1,013 20.6 7.0 185 Clear,no odor 1/21/2011 1 st Qtr. 4:01 PM 4 80 54.49 25.51 27.18 -27.31 49.95 60 7.42 985 19.3 8.5 266 Clear,no odor 4/14/2011 2nd Qtr. 12:21 PM 4 80 53.78 26.22 27.18 -26.60 51.34 60 7.41 759 19.1 8.0 252 Clear,no odor 7/20/2011 3rd Qtr. 5:33 PM 4 80 52.13 27.87 27.18 -24.95 54.57 60 7.47 733 20.7 8.1 261 Clear,no odor 10/13/2011 4th Qtr. 10:53 AM 4 80 50.37 29.63 27.18 -23.19 58.02 60 7.56 585 20.1 8.3 244 Clear,no odor 1/25/2012 1st Qtr. 4:11 PM 4 80 50.46 29.54 27.18 -23.28 57.84 60 7.43 481 19.5 6.2 283 Clear,no odor 4/24/2012 2nd Qtr. 1:41 PM 4 80 49.80 30.20 27.18 -22.62 59.13 60 7.29 507 20.1 7.4 193 Clear,no odor 4/2/2008 2nd Qtr. 2:24 PM 4 82 55.51 26.49 28.01 -27.50 36.20 60 7.43 961 20.6 4.6 200 Clear,no odor 7/11/2008 3rd Qtr. 11:46 AM 4 82 55.79 26.21 28.01 -27.78 51.32 60 7.11 1,314 21.3 5.1 96 Clear,no odor 10/22/2008 4th Qtr. 2:26 PM 4 82 57.94 24.06 28.01 -29.93 47.11 60 7.15 1,225 20.7 5.9 141 Clear,no odor 1/9/2009 1 st Qtr. NA 4 82 59.12 22.88 28.01 -31.11 44.80 60 6.65 1,403 19.9 4.4 97 Clear,no odor 4/8/2009 2nd Qtr. 11:13 AM 4 82 59.96 22.04 28.01 -31.95 43.15 60 7.14 1,304 20.8 5.0 36 Clear,no odor 7/15/2009 3rd Qtr. 11:56 AM 4 82 61.00 21.00 28.01 -32.99 41.12 60 7.19 1,288 22.3 6.9 81 Clear,no odor 10/15/2009 4th Qtr. 10:06 AM 4 82 62.45 19.55 28.01 -34.44 38.28 60 7.19 1,332 21.1 5.1 179 Clear,no odor 2/2/2010 1st Qtr. 4:16 PM 4 82 62.59 19.41 28.01 -34.58 38.01 60 7.23 1,425 19.4 5.5 234 Clear,no odor MW-301 Shallow 4/15/2010 2nd Qtr. 9:09 AM 4 82 61.26 20.74 28.01 -33.25 40.61 60 7.20 1,278 19.8 4.6 224 Clear,no odor 7/8/2010 3rd Qtr. 3:34 PM 4 82 58.99 23.01 28.01 -30.98 45.06 60 7.27 1,207 21.3 5.2 108 Clear,no odor 10/14/2010 4th Qtr. 9:04 AM 4 82 57.60 24.40 28.01 -29.59 47.78 60 7.25 1,193 20.5 6.2 188 Clear,no odor 1/25/2011 1st Qtr. 11:21 AM 4 82 56.77 25.23 28.01 -28.76 49.40 60 7.28 1,192 19.7 4.9 196 Clear,no odor 4/18/2011 2nd Qtr. 11:21 AM 4 82 55.31 26.69 28.01 -27.30 52.26 60 7.22 941 21.0 4.8 212 Clear,no odor 7/20/2011 3rd Qtr. 4:17 PM 4 82 53.50 28.50 28.01 -25.49 55.81 60 7.19 831 21.3 4.6 209 Clear,no odor 10/13/2011 4th Qtr. 5:11 PM 4 82 51.62 30.38 28.01 -23.61 59.49 60 7.16 657 21.0 4.2 254 Clear,no odor 1/25/2012 1 st Qtr. 4:52 PM 4 82 51.42 30.58 28.01 -23.41 59.88 60 6.99 581 20.0 3.5 298 Clear,no odor 4/30/2012 2nd Qtr. 2:56 PM 4 82 51.01 30.99 28.01 -23.00 60.68 60 7.00 649 21.1 4.9 191 Clear,no odor 4/2/2008 Baseline/2nd Qtr 1:58 PM 4 82 54.73 27.27 26.64 -28.09 37.38 60 7.38 1,076 19.2 8.7 211 Clear,no odor 5/20/2008 Supplemental 12:46 PM 4 82 53.82 28.18 26.64 -27.18 55.17 60 7.37 920 19.5 5.3 172 Clear,no odor 7/11/2008 3rd Qtr. 11:26 AM 4 82 54.89 27.11 26.64 -28.25 53.08 60 7.03 1,252 20.3 4.5 -28 Clear,no odor 10/21/2008 4th Qtr. 12:37 PM 4 82 56.90 25.10 26.64 -30.26 49.14 60 7.14 1,157 19.5 3.9 235 Clear,no odor 1/9/2009 1st Qtr. 3:00 PM 4 82 57.90 24.10 26.64 -31.26 47.19 60 6.69 1,234 18.8 3.8 120 Clear,no odor 4/8/2009 2nd Qtr. 10:36 AM 4 82 58.63 23.37 26.64 -31.99 45.76 60 7.10 1,240 19.2 NA NA Clear,no odor 7/15/2009 3rd Qtr. 10:56 AM 4 82 59.67 22.33 26.64 -33.03 43.72 60 7.02 1,380 20.8 2.6 -71 Clear,no odor 10/14/2009 4th Qtr. 11:04 AM 4 82 60.87 21.13 26.64 -34.23 41.37 60 6.99 1,452 20.3 1.4 -31 Clear,no odor 2/2/2010 1st Qtr. 3:26 PM 4 82 61.13 20.87 26.64 -34.49 40.87 60 7.04 1,569 18.6 1.7 -26 Clear,no odor MW-303 Shallow 4/14/2010 2nd Qtr. 5:42 PM 4 82 59.78 22.22 26.64 -33.14 43.51 60 7.02 1,452 19.0 1.4 -6 Turbid,no odor 7/8/2010 3rd Qtr. 3:06 PM 4 82 57.91 24.09 26.64 -31.27 47.17 60 6.91 1,308 20.4 2.1 -70 Clear,no odor 10/14/2010 4th Qtr. 8:21 AM 4 82 56.79 25.21 26.64 -30.15 49.36 60 6.98 1,240 19.4 4.1 39 Clear,no odor 1/25/2011 1st Qtr. 8:26 AM 4 82 55.94 26.06 26.64 -29.30 51.03 60 6.90 1,193 18.4 5.1 47 Clear,no odor 4/14/2011 2nd Qtr. 3:56 PM 4 82 54.37 27.63 26.64 -27.73 54.10 60 7.18 1,020 19.2 5.2 97 Clear,no odor 7/21/2011 3rd Qtr. 9:26 AM 4 82 52.59 29.41 26.64 -25.95 57.59 60 7.06 798 19.4 3.5 143 Clear,no odor 10/13/2011 4th Qtr. 1:26 PM 4 82 51.00 31.00 26.64 -24.36 60.70 60 7.05 657 20.0 3.4 124 Clear,no odor 1/25/2012 1st Qtr. 10:21 AM 4 82 50.44 31.56 26.64 -23.80 61.80 60 7.00 563 18.7 2.4 163 Clear,no odor 4/25/2012 2nd Qtr. 6:11 PM 4 82 49.89 32.11 26.64 -23.25 62.87 60 7.17 599 19.0 5.7 96 Clear,no odor Page 4 of 13