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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/c-) (°C) (mg/L) (mV) Observations Injection Area Wells Continued 5/20/2008 Supplemental 1:42 PM 4 182 54.18 127.82 26.59 -27.59 250.28 270 7.74 481 19.9 1.3 170 Clear,no odor 4/14/2011 2nd Qtr. 9:01 AM 4 182 53.51 128.49 26.59 -26.92 251.60 270 7.48 256 18.5 5.7 230 Clear,no odor MW-320 Intermediate 7/20/2011 3rd Qtr. 1:57 PM 4 182 51.95 130.05 26.59 -25.36 254.65 270 7.73 302 20.2 4.7 192 Clear,no odor 10/12/2011 4th Qtr. 7:05 PM 4 182 50.21 131.79 26.59 -23.62 258.06 270 7.89 250 19.0 5.1 234 Clear,no odor 1/25/2012 1 st Qtr. 2:42 PM 4 182 49.87 132.13 26.59 -23.28 258.72 270 7.64 180 18.3 4.5 267 Clear,no odor 4/24/2012 2nd Qtr. 7:15 PM 4 182 49.69 132.31 26.59 -23.10 259.08 240 7.43 193 19.1 4.4 190 Clear,no odor 4/2/2008 Baseline/2nd Qtr 3:41 PM 4 180 52.16 127.84 24.33 -27.83 45.46 60 7.69 646 19.3 8.4 31 Clear,no odor 5/20/2008 Supplemental 5:02 PM 4 180 56.29 123.71 24.33 -31.96 246.15 270 7.87 561 19.5 7.3 144 Clear,no odor 7/11/2008 3rd Qtr. 3:10 PM 4 180 57.18 122.82 24.33 -32.85 244.41 240 7.64 692 20.3 7.3 138 Clear,no odor 10/22/2008 4th Qtr. 5:24 PM 4 180 59.19 120.81 24.33 -34.86 240.47 240 7.57 660 19.6 9.3 186 Clear,no odor 11/13/2008 4th Qtr./Supplemental 2:35 PM 4 180 NA NA 24.33 NA NA NA 7.16 568 19.9 6.4 73 Clear,no odor 1/12/2009 1 st Qtr. 1:17 PM 4 180 55.21 124.79 24.33 -30.88 248.26 270 7.03 682 19.0 7.7 134 Clear,no odor 4/8/2009 2nd Qtr. 3:09 PM 4 180 61.23 118.77 24.33 -36.90 236.47 240 7.58 700 19.7 7.5 103 Clear,no odor 7/15/2009 3rd Qtr. 2:54 PM 4 180 62.21 117.79 24.33 -37.88 234.56 240 7.68 738 23.1 11.0 130 Clear,no odor 10/15/2009 4th Qtr. 10:54 AM 4 180 62.92 117.08 24.33 -38.59 233.17 240 7.56 760 20.0 7.8 173 Clear,no odor 2/3/2010 1st Qtr. 9:24 AM 4 180 63.32 116.68 24.33 -38.99 232.38 240 7.52 772 18.2 6.7 231 Clear,no odor 4/15/2010 2nd Qtr. 12:34 PM 4 180 61.77 118.23 24.33 -37.44 235.42 240 7.62 709 19.8 6.9 165 Clear,no odor MW-321(I-9) Intermediate 7/8/2010 3rd Qtr. 5:24 PM 4 180 59.64 120.36 24.33 -35.31 235.68 240 7.55 667 20.5 7.3 92 Clear,no odor 10/14/2010 4th Qtr. 11:39 AM 4 180 58.43 121.57 24.33 -34.10 238.05 240 7.64 642 20.1 6.9 180 Clear,no odor 12/6/2010 4th Qtr. 2:57 PM 4 180 53.74 126.26 24.33 -29.41 247.23 270 7.64 735 19.3 7.3 204 Clear,no odor 1/25/2011 1 st Qtr. 1:44 PM 4 180 56.51 123.49 24.33 -32.18 241.81 240 7.55 667 18.7 7.4 237 Clear,no odor 4/18/2011 2nd Qtr. 11:59 AM 4 180 68.71 111.29 24.33 -44.38 217.92 240 7.72 610 19.8 6.3 189 Clear,no odor 5/23/2011 Supplemental 2:39 PM 4 180 67.51 112.49 24.33 -43.18 220.27 240 7.42 575 20.6 3.6 263 Clear,no odor 6/20/2011 Supplemental 12:46 PM 4 180 73.70 106.30 24.33 -49.37 208.15 210 7.44 533 21.0 6.3 211 Clear,no odor 7/21/2011 3rd Qtr. 1:36 PM 4 180 76.80 103.20 24.33 -52.47 202.08 210 7.70 482 21.9 7.0 182 Clear,no odor 8/22/2011 Supplemental 12:14 PM 4 180 71.45 108.55 24.33 -47.12 212.55 240 7.56 451 20.4 6.2 241 Clear,no odor 10/13/2011 4th Qtr. 5:42 PM 4 180 73.65 106.35 24.33 -49.32 208.24 210 7.44 444 20.0 5.0 256 Clear,no odor 1/26/2012 1st Qtr. 9:09 AM 4 180 65.24 114.76 24.33 -40.91 224.71 240 7.32 480 19.0 4.9 325 Clear,no odor 4/30/2012 2nd Qtr. 3:14 PM 4 180 64.80 115.20 24.33 -40.47 225.57 240 7.48 402 20.9 4.3 170 turbid,rotten egg odor 4/1/2008 Baseline/2nd Qtr 2:22 PM 4 183 56.38 126.62 27.38 -29.00 245.97 270 7.71 482 20.9 5.6 154 Clear,no odor 7/10/2008 3rd Qtr. 4:17 PM 4 183 55.33 127.67 27.38 -27.95 249.99 270 7.51 864 22.3 5.4 60 Clear,no odor 10/22/2008 4th Qtr. 11:39 AM 4 183 58.13 124.87 27.38 -30.75 242.54 240 7.44 844 20.4 3.7 96 Clear,no odor 1/8/2009 1st Qtr. 3:24 PM 4 183 58.56 124.44 27.38 -31.18 241.70 240 7.26 849 19.0 2.5 133 Clear,no odor 4/7/2009 2nd Qtr. 7:49 AM 4 183 60.03 122.97 27.38 -32.65 238.82 240 7.49 925 19.6 4.2 75 Clear,no odor 7/14/2009 3rd Qtr. 6:09 PM 4 183 61.23 121.77 27.38 -33.85 236.47 240 7.16 978 22.1 6.2 18 Clear,no odor 10/14/2009 4th Qtr. 11:54 AM 4 183 62.39 120.61 27.38 -35.01 234.20 240 7.34 912 21.8 3.7 111 Clear,no odor 2/2/2010 1st Qtr. 11:04 AM 4 183 62.60 120.40 27.38 -35.22 233.79 240 7.22 985 18.5 4.5 244 Clear,no odor 4/14/2010 2nd Qtr. 1:34 PM 4 183 61.13 121.87 27.38 -33.75 236.67 240 7.49 935 21.0 4.5 164 Clear,no odor MW-322 Intermediate 7/8/2010 3rd Qtr. 10:16 AM 4 183 58.88 124.12 27.38 -31.50 243.04 240 7.56 890 21.0 4.0 109 Clear,no odor 10/13/2010 4th Qtr. 1:34 PM 4 183 57.62 125.38 27.38 -30.24 245.51 240 7.35 866 21.9 3.0 201 Clear,no odor 12/6/2010 4th Qtr. 12:34 PM 4 183 56.43 126.57 27.38 -29.05 247.84 120 7.24 1,047 19.8 5.8 274 Clear,no odor 1/21/2011 1 st Qtr. 4:34 PM 4 183 56.71 126.29 27.38 -29.33 247.29 240 7.37 835 19.0 4.8 241 Clear,no odor 4/14/2011 2nd Qtr. 11:15 AM 4 183 54.98 128.02 27.38 -27.60 250.68 270 7.33 648 20.1 5.1 210 Turbid,no odor 7/21/2011 3rd Qtr. 12:42 PM 4 183 53.48 129.52 27.38 -26.10 253.61 270 7.60 614 21.0 5.4 180 Clear,no odor 10/13/2011 4th Qtr. 9:47 AM 4 183 52.08 130.92 27.38 -24.70 256.35 270 7.60 552 20.4 5.3 210 Clear,no odor 1/25/2012 1 st Qtr. 11:57 AM 4 183 51.55 131.45 27.38 -24.17 257.39 270 7.37 462 19.6 5.5 231 Clear,no odor 4/26/2012 2nd Qtr. 2:27 PM 4 183 51.13 131.87 27.38 -23.75 258.21 270 7.29 522 19.5 5.2 192 Clear,no odor 1/14/2008 Baseline 11:00 AM 4 184 54.70 129.30 27.06 -27.64 140.82 150 7.62 428 18.2 6.4 214 Clear,no odor 4/2/2008 2nd Qtr. 10:33 AM 4 184 54.78 129.22 27.06 -27.72 141.41 150 7.51 777 18.5 7.2 184 Clear,no odor 7/11/2008 3rd Qtr. 8:04 AM 4 184 55.42 128.58 27.06 -28.36 251.77 270 7.52 893 19.6 8.0 105 Clear,no odor 10/21/2008 4th Qtr. 1:54 PM 4 184 57.44 126.56 27.06 -30.38 247.81 240 7.43 823 19.7 8.3 247 Clear,no odor 1/9/2009 1st Qtr. 1:04 PM 4 184 58.61 125.39 27.06 -31.55 245.52 240 7.04 841 18.6 5.6 85 Clear,no odor 4/7/2009 2nd Qtr. 4:30 PM 4 184 59.23 124.77 27.06 -32.17 244.31 240 7.46 901 19.5 8.1 99 Clear,no odor 7/14/2009 3rd Qtr. 1:14 PM 4 184 60.50 123.50 27.06 -33.44 241.82 240 7.32 924 22.2 9.2 189 Clear,no odor 10/12/2009 4th Qtr. 1:58 PM 4 184 61.50 122.50 27.06 -34.44 239.86 240 7.42 838 20.1 9.6 155 Clear,no odor 2/1/2010 1st Qtr. 4:44 PM 4 184 61.71 122.29 27.06 -34.65 239.45 240 7.62 927 18.9 7.9 212 Clear,no odor MW-323 Intermediate 4/13/2010 2nd Qtr. 4:59 PM 4 184 59.93 124.07 27.06 -32.87 242.94 240 7.49 463 19.6 6.1 176 Clear,no odor 7/7/2010 3rd Qtr. 3:34 PM 4 184 57.42 126.58 27.06 -30.36 247.86 270 7.46 855 21.9 6.5 113 Clear,no odor 10/12/2010 4th Qtr. 7:12 PM 4 184 56.29 127.71 27.06 -29.23 250.07 270 7.61 863 20.1 8.0 154 Clear,no odor 1/20/2011 1st Qtr. 3:27 PM 4 184 55.86 128.14 27.06 -28.80 250.91 270 7.53 833 19.0 7.7 269 Clear,no odor 4/13/2011 2nd Qtr. 3:47 PM 4 184 54.01 129.99 27.06 -26.95 254.53 270 7.49 554 19.7 6.1 209 Clear,no odor 7/20/2011 3rd Qtr. 10:02 AM 4 184 52.50 131.50 27.06 -25.44 257.49 270 7.39 668 19.8 6.3 232 Clear,no odor 10/12/2011 4th Qtr. 2:49 PM 4 184 50.80 133.20 27.06 -23.74 260.82 270 7.68 518 19.4 6.2 223 Clear,no odor 1/25/2012 1st Qtr. 3:52 PM 4 184 50.31 133.69 27.06 -23.25 261.78 270 7.36 445 19.1 6.0 281 Clear,no odor 4/24/2012 2nd Qtr. 1:01 PM 4 184 50.13 133.87 27.06 -23.07 262.13 270 7.42 463 19.3 8.2 181 Clear,no odor Page 7 of 13