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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) (AS/cm) (°C) (mg/L) (mV) Observations Injection Area Wells Continued 1/10/2008 Baseline 10:51 PM 4 75 54.48 20.52 28.83 -25.65 37.43 60 7.54 619 18.1 10.3 244 Clear,no odor 4/2/2008 2nd Qtr. 4:26 PM 4 75 55.11 19.89 28.83 -26.28 52.65 60 7.41 922 19.8 3.3 77 Clear,no odor 7/11/2008 3rd Qtr. 3:44 PM 4 75 55.71 19.29 28.83 -26.88 51.47 60 7.25 1,427 21.3 1.4 131 Clear,no odor 10/22/2008 4th Qtr. 4:06 PM 4 75 58.35 16.65 28.83 -29.52 46.30 60 NA NA NA NA NA NA 1/9/2009 1 st Qtr. 4:01 PM 4 75 59.88 15.12 28.83 -31.05 26.86 30 6.64 1,247 19.9 1.50 47 Clear,no odor 4/8/2009 2nd Qtr. 1:06 PM 4 75 60.71 14.29 28.83 -31.88 41.68 60 7.18 1,240 20.8 1.10 96 Clear,no odor 7/15/2009 3rd Qtr. 2:00 PM 4 75 62.77 12.23 28.83 -33.94 37.65 60 7.15 1,355 22.1 2.40 124 Clear,no odor 10/15/2009 4th Qtr. 12:18 PM 4 75 64.93 10.07 28.83 -36.10 33.42 30 7.18 1,437 21.2 2.50 168 Clear,no odor 2/3/2010 1 st Qtr. 8:15 AM 4 75 63.72 11.28 28.83 -34.89 35.79 60 7.08 1,500 18.4 2.30 177 Clear,no odor MW-102 Shallow 4/15/2010 2nd Qtr. 10:41 AM 4 75 61.83 13.17 28.83 -33.00 25.79 30 7.42 1,180 19.9 2.1 179 Clear,no odor 7/8/2010 3rd Qtr. 4:39 PM 4 75 56.43 18.57 28.83 -27.60 36.36 60 7.38 1,061 20.7 2.3 128 Clear,no odor 10/14/2010 4th Qtr. 10:34 AM 4 75 55.39 19.61 28.83 -26.56 38.40 60 7.40 1,235 20.7 2.2 194 Clear,no odor 1/25/2011 1 st Qtr. 3:06 PM 4 75 56.02 18.98 28.83 -27.19 37.16 60 7.24 1,251 19.5 3.7 258 Clear,no odor 4/18/2011 2nd Qtr. 12:58 PM 4 75 52.93 22.07 28.83 -24.10 43.22 60 7.40 952 20.2 1.9 198 Clear,no odor 8/22/2011 3rd Qtr. 4:19 PM 4 75 48.51 26.49 28.83 -19.68 51.87 90 7.20 725 21.3 2.8 206 Clear,no odor 10/17/2011 4th Qtr. 12:16 PM 4 75 50.81 24.19 28.83 -21.98 47.37 60 7.47 725 20.4 4.0 216 Clear,no odor 1/26/2012 1st Qtr. 10:51 AM 4 75 51.37 23.63 28.83 -22.54 46.27 60 7.41 707 19.2 2.5 287 Clear,no odor 4/30/2012 2nd Qtr. 6:44 PM 4 75 50.39 24.61 28.83 -21.56 48.19 60 7.34 594 20.0 5.0 206 Clear,no odor 1/10/2008 Baseline 12:26 PM 4 90 55.90 34.10 29.27 -26.63 56.78 60 7.16 589 16.8 5.4 200 Clear,no odor 4/1/2008 2nd Qtr. 5:48 PM 4 90 55.69 34.31 29.27 -26.42 17.93 30 7.23 1,010 20.0 6.5 42 Turbid,no odor 5/20/2008 Supplemental 3:02 PM 4 90 55.94 34.06 29.27 -26.67 66.69 90 6.90 819 22.0 5.6 -40 Gray,rotten egg odor 7/11/2008 3rd Qtr. 4:04 PM 4 90 56.65 33.35 29.27 -27.38 65.30 60 6.95 1,153 21.8 6.5 -78 Light gray,no odor 10/21/2008 4th Qtr. 10:53 AM 4 90 58.90 31.10 29.27 -29.63 60.70 60 6.68 1,066 20.6 7.1 62 Clear,no odor 1/9/2009 1st Qtr. 10:11 AM 4 90 60.35 29.65 29.27 -31.08 58.05 60 5.94 1,114 20.1 4.4 7 Turbid,no odor 4/8/2009 2nd Qtr. 9:31 AM 4 90 61.31 28.69 29.27 -32.04 56.17 60 6.52 1,121 21.2 2.9 -53 Light gray,rotten egg odor 7/15/2009 3rd Qtr. 9:11 AM 4 90 62.74 27.26 29.27 -33.47 53.37 60 6.87 1,186 22.4 8.7 -135 Clear,no odor 10/12/2009 4th Qtr. 6:21 PM 4 90 64.70 25.30 29.27 -35.43 49.53 60 6.80 1,213 20.5 6.3 -112 Turbid,no odor MW-104(S-2) Shallow 2/2/2010 1st Qtr. 1:06 PM 4 90 64.63 25.37 29.27 -35.36 49.67 60 6.74 1,267 20.0 6.4 -21 Light gray,no odor 4/14/2010 2nd Qtr. 3:26 PM 4 90 62.92 27.08 29.27 -33.65 53.03 60 6.80 1,239 20.6 4.5 25 Turbid,no odor 7/8/2010 3rd Qtr. 12:07 PM 4 90 59.02 30.98 29.27 -29.75 60.66 240 6.72 1,176 22.8 2.1 -47 Clear,no odor 10/13/2010 4th Qtr. 3:01 PM 4 90 56.48 33.52 29.27 -27.21 65.64 60 7.05 1,697 23.9 4.1 -80 Black,rotten egg odor 1/25/2011 1st Qtr. 10:49 AM 4 90 57.09 32.91 29.27 -27.82 64.44 60 8.77 4,490 20.2 0.0 -301 Black,rotten egg odor 4/14/2011 2nd Qtr. 1:24 PM 4 90 55.34 34.66 29.27 -26.07 67.87 90 7.40 1,961 23.3 0.0 -150 Black,rotten egg odor 8/22/2011 3rd Qtr. 3:49 PM 4 90 51.34 38.66 29.27 -22.07 75.70 90 7.04 872 22.8 4.8 -125 Black,rotten egg odor 10/13/2011 4th Qtr. 11:34 AM 4 90 53.15 36.85 29.27 -23.88 72.16 90 7.16 775 22.4 2.1 -43 Gray,rotten egg odor 1/24/2012 1st Qtr. 10:29 AM 4 90 52.18 37.82 29.27 -22.91 74.06 90 7.02 695 20.9 6.0 20 Black,rotten egg odor 4/24/2012 2nd Qtr. 12:22 PM 4 90 51.67 38.33 29.27 -22.40 75.05 120 6.78 730 22.2 7.1 29 Light gray,no odor 1/10/2008 Baseline 11:56 PM 4 80 55.00 25.00 28.62 -26.38 36.12 60 7.73 205 15.7 6.81 229 Clear,no odor 4/2/2008 2nd Qtr. 2:47 PM 4 80 54.91 25.09 28.62 -26.29 36.20 60 7.22 390 17.9 4.2 31 Clear,no odor 7/11/2008 3rd Qtr. 1:17 PM 4 80 55.71 24.29 28.62 -27.09 53.43 60 7.19 586 20.3 1.9 98 Clear,no odor 10/22/2008 4th Qtr. 2:02 PM 4 80 58.07 21.93 28.62 -29.45 48.81 60 7.19 639 19.8 1.6 52 Clear,no odor 1/8/2009 1st Qtr. 4:21 PM 4 80 59.66 20.34 28.62 -31.04 45.70 60 6.65 532 19.0 LA 71 Gray,no odor 4/7/2009 2nd Qtr. 3:11 PM 4 80 60.63 19.37 28.62 -32.01 43.88 60 7.15 285 19.5 2.4 -16 Clear,no odor 7/14/2009 3rd Qtr. 12:36 PM 4 80 62.03 17.97 28.62 -33.41 41.06 60 7.44 278 26.9 0.9 152 Clear,no odor 10/12/2009 4th Qtr. 1:21 PM 4 80 63.92 16.08 28.62 -35.30 37.36 60 6.93 862 21.3 1.6 -21 Clear,no odor 2/1/2010 1st Qtr. 4:01 PM 4 80 63.92 16.08 28.62 -35.30 37.36 60 7.32 916 18.0 4.9 144 Turbid,no odor MW-105 Shallow 4/13/2010 2nd Qtr. 4:21 PM 4 80 62.20 17.80 28.62 -33.58 34.85 60 6.94 873 20.0 1.2 58 Clear,no odor 7/7/2010 3rd Qtr. 2:54 PM 4 80 58.33 21.67 28.62 -29.71 42.43 60 7.05 559 21.8 1.5 -68 Light gray,no odor 10/12/2010 4th Qtr. 6:36 PM 4 80 56.15 23.85 28.62 -27.53 46.70 60 6.75 1,286 21.0 2.1 -10 Light gray,no odor 1/20/2011 1 st Qtr. 2:36 PM 4 80 56.26 23.74 28.62 -27.64 46.49 60 6.62 1,002 20.5 2.7 2.7 Clear,no odor 4/13/2011 2nd Qtr. 12:26 PM 4 80 54.62 25.38 28.62 -26.00 49.70 60 6.80 860 20.5 1.4 60 Clear,no odor 7/19/2011 3rd Qtr. 5:26 PM 4 80 52.63 27.37 28.62 -24.01 53.59 60 6.63 984 21.3 1.7 126 Turbid,no odor 10/12/2011 4th Qtr. 12:44 PM 4 80 49.90 30.10 28.62 -21.28 58.94 60 7.19 694 21.9 3.4 136 Clear,no odor 1/25/2012 1st Qtr. 12:11 PM 4 80 50.98 29.02 28.62 -22.36 56.82 60 6.82 496 20.4 1.8 168 Clear,no odor 4/26/2012 2nd Qtr. 4:16 PM 4 80 42.95 37.05 28.62 -14.33 72.55 90 7.27 131 19.1 4.4 -3 Turbid,no odor 1/9/2008 Baseline 4:58 PM 4 73 55.20 17.80 29.03 -26.17 34.85 60 7.56 412 17.8 7.11 243 Clear,no odor 4/2/2008 2nd Qtr. 3:04 PM 4 73 55.37 17.63 29.03 -26.34 21.59 30 7.29 633 19.9 6.8 153 Clear,no odor 7/11/2008 3rd Qtr. 2:14 PM 4 73 55.94 17.06 29.03 -26.91 33.40 60 7.19 803 20.9 7.0 66 Clear,no odor 10/22/2008 4th Qtr. 3:03 PM 4 73 58.48 14.52 29.03 -29.45 28.43 30 7.32 816 21.4 6.2 136 Clear,no odor 1/12/2009 1 st Qtr. 9:49 AM 4 73 60.30 12.70 29.03 -31.27 24.86 30 7.55 785 19.2 6.2 140 Clear,no odor 4/8/2009 2nd Qtr. 1:08 PM 4 73 61.21 11.79 29.03 -32.18 23.08 30 7.19 783 20.3 7.1 60 Clear,no odor 7/15/2009 3rd Qtr. 1:43 PM 4 73 62.87 10.13 29.03 -33.84 19.83 30 7.48 839 25.1 2.4 119 Clear,no odor 10/15/2009 4th Qtr. 10:18 AM 4 73 65.00 8.00 29.03 -35.97 15.66 30 7.18 165 22.2 5.7 140 Light gray,no odor 2/2/2010 1st Qtr. 5:34 PM 4 73 66.30 6.70 29.03 -37.27 13.11 30 7.19 173 18.7 2.9 183 Turbid,no odor MW-106 Shallow 4/15/2010 2nd Qtr. 10:23 AM 4 73 62.54 10.46 29.03 -33.51 20.48 30 7.31 192 20.5 1.6 143 Turbid,no odor 7/8/2010 3rd Qtr. 4:26 PM 4 73 58.08 14.92 29.03 -29.05 29.21 30 7.25 859 22.7 3.1 128 Turbid,no odor 10/14/2010 4th Qtr. 10:17 AM 4 73 56.03 16.97 29.03 -27.00 33.23 30 7.41 875 21.1 1.9 191 Clear,no odor 1/25/2011 1st Qtr. 11:48 AM 4 73 56.65 16.35 29.03 -27.62 32.01 30 7.25 1,086 19.3 4.0 245 Clear,no odor 4/18/2011 2nd Qtr. 9:21 AM 4 73 54.59 18.41 29.03 -25.56 36.05 60 7.33 762 20.1 3.2 219 Clear,no odor 7/21/2011 3rd Qtr. 2:59 PM 4 73 52.50 20.50 29.03 -23.47 40.14 60 7.29 612 22.0 2.8 238 Clear,no odor 10/17/2011 4th Qtr. 10:04 AM 4 73 51.00 22.00 29.03 -21.97 43.08 60 7.28 510 21.2 6.3 265 Clear,no odor 1/25/2012 1st Qtr. 5:11 PM 4 73 51.34 21.66 29.03 -22.31 42.41 60 7.42 331 20.0 4.9 248 Clear,no odor 4/30/2012 2nd Qtr. 3:36 PM 4 73 50.82 22.18 29.03 -21.79 43.43 60 7.34 482 21.0 4.4 200 Clear,no odor Page 2 of 13