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TABLE 4 FIELD PARAMETERS AND WELL DETAILS 2011 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) (µS/cm) (°C) (mg/L) (mV) Observations Injection Area Wells Continued 8/10/2010 Baseline 1:48 PM 2 156.45 59.05 97.40 27.69 -31.36 600.00 600 7.90 751 24.5 3.6 111 Yellow,no odor 8/16/2010 Baseline 11:36 AM 2 156.50 59.04 97.46 27.69 -31.35 47.72 52.5 7.39 943 21.0 1.6 219 Clear,no odor 8/23/2010 Baseline 9:41 AM 2 156.00 58.76 97.24 27.69 -31.07 47.61 52.5 7.45 994 20.5 1.5 161 Clear,no odor 10/14/2010 4th Qtr. 4:11 PM 2 156.50 58.48 98.02 27.69 -30.79 47.99 52.5 7.39 864 22.1 6.5 158 Light yellow,no odor 12/6/2010 4th Qtr. 11:15 AM 2 156.24 57.32 98.92 27.69 -29.63 48.43 52.5 7.35 855 21.0 6.9 252 Light yellow,no odor 1/25/2011 1st Qtr. 5:57 PM 2 156.24 57.34 98.90 27.69 -29.65 48.42 52.5 7.41 672 19.6 9.2 247 Light yellow,no odor MW-448D Intermediate 4/18/2011 2nd Qtr. 3:56 PM 2 156.50 55.58 100.92 27.69 -27.89 49.41 52.5 7.48 621 21.0 7.4 192 Light lime,no odor 5/23/2011 Supplemental 6:24 PM 2 156.50 54.76 101.74 27.69 -27.07 49.81 52.5 7.50 674 20.6 7.4 271 Light yellow,no odor 6/20/2011 Supplemental 5:11 PM 2 156.50 54.55 101.95 27.69 -26.86 49.91 52.5 7.47 634 22.5 7.5 224 Clear,no odor 7/21/2011 3rd Qtr. 6:22 PM 2 156.50 53.95 102.55 27.69 -26.26 50.21 52.5 7.57 537 21.5 8.2 233 Light yellow,no odor 8/22/2011 Supplemental 3:22 PM 2 156.50 52.73 103.77 27.69 -25.04 50.81 52.5 7.55 479 21.5 8.5 230 Light lime,no odor 10/17/2011 4th Qtr. 4:06 PM 2 156.50 52.70 103.80 27.69 -25.01 50.82 52.5 7.60 428 20.6 7.8 211 Clear,no odor 10/12/2010 Baseline 3:13 PM 4 208.00 54.03 153.97 23.37 -30.66 301.49 300 7.86 280 21.4 4.4 181 Clear,no odor MW-363 (D-1) Intermediate 1/20/2011 1st Qtr. 11:05 AM 4 208.00 53.39 154.61 23.37 -30.02 302.74 300 7.69 284 19.3 6.3 339 Clear,no odor 4/12/2011 2nd Qtr. 5:39 PM 4 208.00 51.21 156.79 23.37 -27.84 307.01 330 7.50 266 21.1 4.1 167 Turbid,no odor 12/6/2010 Baseline/4th Qtr. 11:33 AM 4 60.13 56.06 4.07 28.46 -27.60 7.97 30 6.95 1,066 20.0 4.1 272 Yellow,no odor 1/25/2011 1st Qtr. 6:24 PM 4 89.64 55.66 33.98 28.46 -27.20 66.54 90 7.12 939 19.1 8.4 298 Yellow,no odor EW-3 Intermediate 4/18/2011 2nd Qtr 4:29 PM 4 89.64 52.24 37.40 28.46 -23.78 73.23 90 7.45 543 20.1 7.9 187 Light green,no odor 7/21/2011 3rd Qtr. 6:49 PM 4 89.64 50.70 38.94 28.46 -22.24 76.25 90 7.69 402 20.2 8.6 240 Light yellow,no odor 10/17/2011 4th Qtr. 4:23 PM 4 59.35 49.41 9.94 28.46 -20.95 19.46 30 7.38 466 20.3 7.2 226 Lime green,no odor 12/8/2010 Baseline/4th Qtr. 9:18 AM 6 94.00 55.45 38.55 28.06 -27.39 169.84 180 7.06 563 18.5 3.7 283 Clear,no odor 1/21/2011 1st Qtr. 2:53 PM 6 94.00 54.79 39.21 28.06 -26.73 172.75 180 7.27 691 19.3 6.5 244 Clear,no odor EW-4 Intermediate 4/18/2011 2nd Qtr. 10:41 AM 6 94.00 51.13 42.87 28.06 -23.07 188.88 210 7.46 547 20.2 4.6 195 Clear,no odor 7/21/2011 3rd Qtr. 11:17 AM 6 94.00 49.53 44.47 28.06 -21.47 195.93 210 7.57 432 20.3 5.0 202 Clear,no odor 10/13/2011 4th Qtr. 3:27 PM 6 94.00 48.53 45.47 28.06 -20.47 200.33 210 7.66 370 20.2 6.1 201 Clear,no odor 12/8/2010 Baseline/4th Qtr. 10:08 AM 6 98.50 56.63 41.87 29.20 -27.43 184.47 180 7.39 602 18.6 6.2 300 Clear,no odor 1/25/2011 1st Qtr. 9:51 AM 6 98.50 56.19 42.31 29.20 -26.99 186.41 360 7.50 535 18.6 7.2 267 Clear,no odor EW-5 Intermediate 4/18/2011 2nd Qtr. 8:41 AM 6 98.50 52.95 45.55 29.20 -23.75 200.68 210 7.39 492 19.2 4.9 195 Clear,no odor 7/21/2011 3rd Qtr. 10:21 AM 6 98.50 51.03 47.47 29.20 -21.83 209.14 210 7.52 443 20.3 6.0 203 Clear,no odor 10/13/2011 4th Qtr. 2:21 PM 6 98.50 50.00 48.50 29.20 -20.80 213.68 210 7.58 488 21.4 7.2 220 Clear,no odor 12/6/2010 Baseline/4th Qtr. 10:08 AM 4 170.00 59.30 110.70 30.60 -28.70 216.76 240 7.65 723 5.8 5.8 216 Clear,no odor 1/25/2011 1st Qtr. 2:49 PM 4 170.00 59.24 110.76 30.60 -28.64 216.88 240 7.62 602 18.7 6.3 239 Clear,no odor 4/18/2011 2nd Qtr. 12:40 PM 4 170.00 56.75 113.25 30.60 -26.15 221.75 240 7.79 497 20.4 5.8 182 Clear,no odor 5/23/2011 Supplemental 1:09 PM 4 170.00 56.48 113.52 30.60 -25.88 222.28 240 7.42 547 20.1 6.9 393 Clear,no odor MW-4 Intermediate 6/20/2011 Supplemental 11:29 AM 4 170.00 56.13 113.87 30.60 -25.53 222.97 240 7.23 506 20.6 6.3 260 Clear,no odor 7/21/2011 3rd Qtr. 3:49 PM 4 170.00 55.24 114.76 30.60 -24.64 224.71 240 7.73 425 21.9 6.8 231 Turbid,no odor 8/22/2011 Supplemental 11:09 AM 4 170.00 53.57 116.43 30.60 -22.97 227.98 240 7.57 409 20.3 5.6 248 Turbid,no odor 10/17/2011 4th Qtr. 11:29 AM 4 170.00 53.88 116.12 30.60 -23.28 227.37 240 7.59 443 20.1 5.0 175 Clear,no odor 12/8/2010 Baseline/4th Qtr. 8:42 AM 4 182.00 56.51 125.49 28.61 -27.90 245.72 240 7.58 653 19.0 3.8 254 Clear,no odor 1/25/2011 1st Qtr. 12:34 PM 4 182.00 56.26 125.74 28.61 -27.65 246.21 240 7.36 609 19.3 4.5 254 Clear,no odor 4/18/2011 2nd Qtr. 10:07 AM 4 182.00 52.59 129.41 28.61 -23.98 253.40 270 7.81 510 20.2 6.0 216 Clear,no odor 5/23/2011 Supplemental 1:57 PM 4 182.00 53.33 128.67 28.61 -24.72 251.95 270 7.42 542 20.5 3.8 307 Clear,no odor MW-212 Intermediate 6/20/2011 Supplemental 12:12 PM 4 182.00 52.91 129.09 28.61 -24.30 252.77 270 7.22 499 20.6 5.7 208 Clear,no odor 7/21/2011 3rd Qtr. 11:57 AM 4 182.00 50.90 131.10 28.61 -22.29 256.71 270 7.73 431 21.4 5.7 197 Clear,no odor 8/22/2011 Supplemental 9:26 AM 4 182.00 48.30 133.70 28.61 -19.69 261.80 270 7.55 402 19.8 5.5 322 Clear,no odor 10/13/2011 4th Qtr. 4:31 PM 4 182.00 50.32 131.68 28.61 -21.71 257.84 270 7.65 395 20.7 5.1 200 Clear,no odor J-- Background/Compliance Wells 1/9/2008 Background 1:51 PM 4 100 55.75 44.25 29.78 -25.97 50.71 60 7.61 524 17.6 6.44 214 Clear,no odor 4/1/2008 2nd Qtr./Compliance 2:59 PM 4 100 55.93 44.07 29.78 -26.15 86.29 90 7.53 784 20.2 7.2 135 Clear,no odor 7/10/2008 3rd Qtr. 4:32 PM 4 100 55.75 44.25 29.78 -25.97 84.57 90 7.30 1,112 21.0 6.5 84 Clear,no odor 10/22/2008 4th Qtr./Compliance 9:04 AM 4 100 59.20 40.80 29.78 -29.42 79.77 90 7.25 970 19.7 5.7 244 Turbid,no odor 1/9/2009 1st Qtr. 10:37 AM 4 100 60.77 39.23 29.78 -30.99 76.81 90 6.59 1,010 19.1 4.7 50 Turbid,no odor 4/8/2009 2nd Qtr. 8:39 AM 4 100 61.61 38.39 29.78 -31.83 75.17 90 7.20 965 20.6 4.8 363 Turbid,no odor 7/15/2009 3rd Qtr. 8:56 AM 4 100 63.41 36.59 29.78 -33.63 71.64 90 7.29 929 21.5 7.2 152 Turbid,no odor 10/12/2009 4th Qtr. 6:06 PM 4 100 65.49 34.51 29.78 -35.71 67.57 90 7.33 929 19.8 6.8 -25 Turbid,no odor MW-7 Shallow 2/2/2010 1st Qtr. 12:34 PM 4 100 64.62 35.38 29.78 -34.84 69.27 90 7.24 979 18.9 5.3 221 Turbid,no odor 4/14/2010 2nd Qtr. 3:14 PM 4 100 62.70 37.30 29.78 -32.92 73.03 90 7.39 891 20.0 5.0 204 Clear,no odor 7/8/2010 3rd Qtr. 11:38 AM 4 100 53.53 46.47 29.78 -23.75 90.99 90 7.38 813 21.1 5.9 123 Light brown,no odor 10/13/2010 4th Qtr. 2:40 PM 4 100 56.70 43.30 29.78 -26.92 84.79 90 7.51 858 21.2 5.3 203 Turbid,no odor 1/21/2011 1st Qtr. 5:44 PM 4 100 57.13 42.87 29.78 -27.35 83.94 90 7.41 852 19.3 7.2 281 Clear,no odor 4/14/2011 2nd Qtr. 12:52 PM 4 100 54.05 45.95 29.78 -24.27 89.97 90 7.43 687 20.1 6.3 220 Clear,no odor 7/20/2011 3rd Qtr. 5:54 PM 4 100 52.41 47.59 29.78 -22.63 93.19 90 7.55 690 20.6 6.1 267 Clear,no odor 10/13/2011 4th Qtr. 11:16 AM 4 100 51.32 48.68 29.78 -21.54 95.32 90 7.57 546 20.2 5.7 245 Turbid,no odor Page 10 of 13