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TABLE 4 FIELD PARAMETERS AND WELL DETAILS 2012 ANNUAL GROUNDWATER MONITORING REPORT FORMER MARLEY COOLING TOWER SITE STOCKTON,CALIFORNIA Page 3 of 17 Field Parameters Top of Well Depth to Water Casing Groundwater Cale 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 In'ection Area Wells(Continued) 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 1..4 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 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 MW-105 Shallow 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 1st 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 7/24/2012 3rd Qtr. 9:39 AM 4 80 49.23 30.77 28.62 -20.61 60.25 90 6.56 540 21.7 1.5 109 Clear,no odor 10/23/2012 4th Qtr 3:16 PM 4 80 50.42 29.58 28.62 -21.80 57.92 60 6.59 433 20.0 8.3 43 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 1st 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 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 MW-106 Shallow 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 7/24/2012 3rd Qtr. 5;26 pm 4 73 46.13 26.87 29.03 -17.10 52.61 60 7.38 405 20.9 5.6 207 Clear,no odor 10/24/2012 4th Qtr 5:51 PM 4 73 51.36 21.64 29.03 -22.33 42.37 60 7.16 468 20.2 6.4 220 Clear,no odor 3/19/2008 Baseline 1:42 PM 4 80 61.28 18.72 27.73 -33.55 36.65 60 7.44 793 21.0 5.4 191 Clear,no odor 5/20/2008 Supplemental 4:21 PM 4 80 60.80 19.20 27.73 -33.07 37.59 60 7.49 691 20.9 5.6 156 Clear,no odor 7/11/2008 3rd Qtr. 4:21 PM 4 80 59.35 20.65 27.73 -31.62 40.43 60 7.22 954 21.8 3.5 56 Clear,no odor 10/22/2008 4th Qtr. 6:31 PM 4 80 60.02 19.98 27.73 -32.29 39.12 60 7.36 884 21.7 5.7 122 Turbid,no odor 1/12/2009 1st Qtr. 2:31 PM 4 80 58.59 21.41 27.73 -30.86 41.92 60 6.92 930 15.8 4.2 156 Clear,no odor 4/8/2009 2nd Qtr. 4:15 PM 4 80 66.04 13.96 27.73 -38.31 27.33 30 7.30 936 21.5 5.2 116 Clear,no odor 7/15/2009 3rd Qtr. 4:13 PM 4 80 64.71 15.29 27.73 -36.98 29.93 30 7.31 987 22.5 8.4 139 Turbid,no odor 10/15/2009 4th Qtr. 12:58 PM 4 80 74.89 5.11 27.73 -47.16 10.00 30 7.25 1,021 22.7 5.8 183 Clear,no odor 2/3/2010 1st Qtr. 10:41 AM 4 80 72.90 7.10 27.73 45.17 13.90 30 7.34 1,057 21.5 4.5 224 Clear,no odor 4/15/2010 2nd Qtr. 1:43 PM 4 80 65.88 14.12 27.73 -38.15 27.65 30 7.30 984 20.9 5.4 162 Clear,no odor MW-204(S-8) Shallow 7/8/2010 3rd Qtr. 6:15 PM 4 80 61.07 18.93 27.73 -33.34 37.07 60 7.23 947 23.8 3.5 125 Clear,no odor 10/14/2010 4th Qtr. 12:54 PM 4 80 57.24 22.76 27.73 -29.51 44.57 60 7.28 895 26.1 3.5 167 Clear,no odor 1/25/2011 1st Qtr. 4:00 PM 4 80 56.79 23.21 27.73 -29.06 45.45 60 7.22 879 23.2 5.3 254 Turbid,no odor 4/18/2011 2nd Qtr. 1:21 PM 4 80 58.18 21.82 27.73 -30.45 42.73 60 7.42 762 20.8 7.5 207 Clear,no odor 7/21/2011 3rd Qtr. 4:21 PM 4 80 52.41 27.59 27.73 -24.68 54.02 60 7.43 668 22.4 3.3 217 Gray,no odor 8/22/2011 Supplemental 1:11 PM 4 80 50.97 29.03 27.73 -23.24 56.84 60 7.31 587 21.8 4.1 260 Clear,no odor 10/17/2011 4th Qtr. 1:46 PM 4 80 50.52 29.48 27.73 -22.79 57.72 60 7.40 583 21.6 3.9 204 Clear,no odor 1/24/2012 1st Qtr. 9:51 AM 4 80 50.45 29.55 27.73 -22.72 57.86 60 7.14 520 20.1 2.2 343 Clear,no odor 7/19/2012 3rd Qtr. 2:26 PM 4 80 49.48 30.52 27.73 -21.75 59.76 60 7.13 469 22.1 3.2 159 Turbid,no odor 10/25/2012 4th Qtr 9:51 AM 4 80 50.24 29.76 27.73 -22.51 58.27 60 7.23 575 21.5 1.7 231 Clear,no odor