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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 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 1 st 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 1 st 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 MW-204(S-8) Shallow 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 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 3/19/2008 Baseline 2:27 PM 4 80 55.00 25.00 27.47 -27.53 65.30 67.5 7.40 890 21.2 5.4 201 Clear,no odor 7/11/2008 3rd Qtr. 12:16 PM 4 80 55.20 24.80 27.47 -27.73 50.51 52.5 7.18 1,237 24.3 4.0 99 Turbid,no odor 10/22/2008 4th Qtr. 3:26 PM 4 80 57.36 22.64 27.47 -29.89 46.28 60 7.32 1,031 22.0 6.1 156 Clear,no odor 1/12/2009 1st Qtr. 3:13 PM 4 80 61.28 18.72 27.47 -33.81 23.73 30 6.80 1,279 20.7 4.4 170 Yellow,no odor 4/8/2009 2nd Qtr. 1:54 PM 4 80 59.35 20.65 27.47 -31.88 42.39 60 7.19 1,128 22.1 5.4 54 Light gray,rotten egg odor 7/15/2009 3rd Qtr. 2:18 PM 4 80 60.35 19.65 27.47 -32.88 40.43 60 7.30 1,200 23.0 7.2 128 Clear,no odor 10/15/2009 4th Qtr. 11:35 AM 4 80 61.71 18.29 27.47 -34.24 37.77 37.5 7.39 1,286 23.2 5.3 152 Clear,no odor 2/3/2010 1st Qtr. 8:46 AM 4 80 62.00 18.00 27.47 -34.53 37.20 37.5 7.15 1,409 19.8 4.2 233 Clear,no odor 4/15/2010 2nd Qtr. 11:11 AM 4 80 60.40 19.60 27.47 -32.93 38.38 45 7.30 1,434 20.5 4.8 180 Clear,no odor MW-205(S-7) Shallow 7/8/2010 3rd Qtr. 4:56 PM 4 80 56.12 23.88 27.47 -28.65 46.76 60 7.51 1,211 21.9 5.3 118 Clear,no odor 10/14/2010 4th Qtr. 11:03 AM 4 80 56.57 23.43 27.47 -29.10 45.88 52.5 7.41 1,026 21.0 5.5 177 Clear,no odor 1/25/2011 1 st Qtr. 2:16 PM 4 80 55.86 24.14 27.47 -28.39 47.27 60 7.30 1,021 20.3 6.6 251 Clear,no odor 4/18/2011 2nd Qtr. 11:06 AM 4 80 54.28 25.72 27.47 -26.81 50.36 60 7.24 850 21.0 5.2 211 Clear,no odor 7/21/2011 3rd Qtr. 2:41 PM 4 80 54.64 25.36 27.47 -27.17 49.66 60 7.35 707 21.9 5.5 231 Turbid,no odor 8/22/2011 Supplemental 12:52 PM 4 80 51.46 28.54 27.47 -23.99 55.88 60 7.51 621 21.3 7.3 241 Clear,no odor 10/17/2011 4th Qtr. 9:39 AM 4 80 50.78 29.22 27.47 -23.31 57.22 60 7.18 643 21.0 5.7 286 Clear,no odor 1/26/2012 1 st Qtr. 10:31 AM 4 80 50.61 29.39 27.47 -23.14 57.55 60 7.25 645 20.2 5.4 285 Clear,no odor 4/30/2012 2nd Qtr. 5:02 PM 4 80 50.20 29.80 27.47 -22.73 58.35 60 7.34 553 22.4 6.1 188 Clear,no odor 7/10/2008 3rd Qtr. 11:41 AM 4 80 56.21 23.79 30.11 -26.10 50.49 60 7.98 612 27.1 2.9 130 Clear,no odor 10/22/2008 4th Qtr. 6:42 PM 4 80 59.61 20.39 30.11 -29.50 43.84 60 7.17 1,135 21.7 2.1 134 Yellow,no odor 11/13/2008 4th Qtr./Supplemental 3:35 PM 4 80 59.50 20.50 30.11 -29.39 39.97 60 6.78 1,530 21.4 1.30 50 Yellow,no odor 1/12/2009 1st Qtr. 3:13 PM 4 80 61.28 18.72 30.11 -31.17 23.73 30 6.80 1,279 20.7 4.40 170 Yellow,no odor 4/8/2009 2nd Qtr. 5:11 PM 4 80 61.97 18.03 30.11 -31.86 39.22 60 7.10 1,229 21.5 4.00 132 Yellow,no odor 7/15/2009 3rd Qtr. 5:11 PM 4 80 64.00 16.00 30.11 -33.89 35.24 60 7.06 1,261 23.7 4.80 179 Lime,no odor 10/15/2009 4th Qtr. 1:56 PM 4 80 60.18 19.82 30.11 -30.07 42.72 60 7.12 1,432 24.4 6.60 201 Yellow,no odor 2/3/2010 1st Qtr. 11:31 AM 4 80 65.10 14.90 30.11 -34.99 33.09 60 7.15 1,047 20.7 5.60 250 Bright yellow,no odor MW-206 Shallow 4/15/2010 2nd Qtr. 2:43 PM 4 80 63.13 16.87 30.11 -33.02 33.03 30 7.11 1,195 22.0 5.0 164 Yellow,no odor 7/8/2010 3rd Qtr. 7:00 PM 4 80 58.03 21.97 30.11 -27.92 43.02 60 7.03 1,241 22.2 5.5 166 Yellow,no odor 10/14/2010 4th Qtr. 4:31 PM 4 80 56.47 23.53 30.11 -26.36 46.07 60 6.96 1,008 22.2 4.1 55 Light gray,rotten egg odor 1/25/2011 1st Qtr. 12:01 PM 4 80 56.92 23.08 30.11 -26.81 45.19 60 6.84 1,054 20.8 6.6 58 Black,rotten egg odor 4/13/2011 2nd Qtr. 1:51 PM 4 80 53.85 26.15 30.11 -23.74 51.20 60 6.96 799 20.5 5.3 80 Black,rotten egg odor 7/19/2011 3rd Qtr. 6:26 PM 4 80 52.63 27.37 30.11 -22.52 53.59 60 7.47 815 22.6 4.9 133 Cloudy,no odor 10/12/2011 4th Qtr. 1:49 PM 4 80 50.88 29.12 30.11 -20.77 57.02 60 6.93 620 22.0 2.0 45 Black,no odor 1/24/2012 1st Qtr. 10:56 AM 4 80 52.21 27.79 30.11 -22.10 54.42 60 6.84 508 19.2 3.5 119 Clear,no odor 4/30/2012 2nd Qtr. 5:29 PM 4 80 47.68 32.32 30.11 -17.57 63.29 60 7.27 312 23.1 6.5 48 Turbid,no odor 1/9/2008 Baseline 4:08 PM 4 82 54.18 27.82 29.02 -25.16 54.47 60 7.84 285 17.1 6.41 246 Clear,no odor 4/2/2008 2nd Qtr. 12:01 PM 4 82 54.98 27.02 29.02 -25.96 36.18 60 7.70 496 19.4 4.2 154 Clear,no odor 7/11/2008 3rd Qtr. 9:26 AM 4 82 55.95 26.05 29.02 -26.93 51.00 60 7.47 622 19.3 4.6 -18 Clear,no odor 10/22/2008 4th Qtr. 12:16 PM 4 82 58.50 23.50 29.02 -29.48 46.01 60 7.42 640 20.6 4.1 61 Clear,no odor 1/9/2009 1st Qtr. 2:40 PM 4 82 60.15 21.85 29.02 -31.13 42.78 60 6.52 478 19.0 3.1 94 Clear,no odor 4/8/2009 2nd Qtr. 8:56 AM 4 82 61.00 21.00 29.02 -31.98 41.12 60 7.40 658 19.5 3.9 157 Clear,no odor 7/15/2009 3rd Qtr. 11:41 AM 4 82 63.13 18.87 29.02 -34.11 36.94 60 7.33 698 21.3 3.9 72 Clear,no odor 10/15/2009 4th Qtr. 9:08 AM 4 82 65.24 16.76 29.02 -36.22 32.81 30 7.12 429 20.1 3.6 118 Clear,no odor 2/2/2010 1st Qtr. 3:49 PM 4 82 63.75 18.25 29.02 -34.73 35.73 60 7.15 560 18.8 3.2 209 Clear,no odor MW-207 Shallow 4/15/2010 2nd Qtr. 8:46 AM 4 82 61.73 20.27 29.02 -32.71 39.69 60 7.20 647 17.2 4.2 187 Turbid,no odor 7/8/2010 3rd Qtr. 3:20 PM 4 82 57.20 24.80 29.02 -28.18 48.56 60 7.32 798 20.8 5.0 78 Clear,no odor 10/14/2010 4th Qtr. 8:42 AM 4 82 55.17 26.83 29.02 -26.15 52.54 60 7.41 737 19.4 6.0 155 Clear,no odor 1/25/2011 1st Qtr. 10:36 AM 4 82 56.03 25.97 29.02 -27.01 50.85 60 7.30 701 18.7 5.0 275 Clear,no odor 4/14/2011 2nd Qtr. 4:56 PM 4 82 52.02 29.98 29.02 -23.00 58.70 60 7.50 663 19.3 5.6 182 Clear,no odor 7/21/2011 3rd Qtr. 9:46 AM 4 82 50.56 31.44 29.02 -21.54 61.56 60 7.56 501 20.0 5.5 212 Clear,no odor 10/13/2011 4th Qtr. 1:46 PM 4 82 49.64 32.36 29.02 -20.62 63.36 60 7.50 417 19.2 4.5 234 Clear,no odor 1/25/2012 1st Qtr. 4:31 PM 4 82 51.16 30.84 29.02 -22.14 60.39 60 7.52 281 17.3 5.9 278 Clear,no odor 4/30/2012 2nd Qtr. 1:21 PM 4 82 49.90 32.10 29.02 -20.88 62.86 60 7.36 393 19.6 4.8 214 Clear,no odor Page 3 of 13