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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 12/6/2010 Baseline/4th Qtr. 10:08 AM 4 159.00 59.30 99.70 30.60 -28.70 195.22 240 7.65 723 5.8 5.8 216 Clear,no odor 1/25/2011 1st Qtr. 2:49 PM 4 159.00 59.24 99.76 30.60 -28.64 195.34 240 7.62 602 18.7 6.3 239 Clear,no odor 4/18/2011 2nd Qtr. 12:40 PM 4 159.00 56.75 102.25 30.60 -26.15 200.22 240 7.79 497 20.4 5.8 182 Clear,no odor 5/23/2011 Supplemental 1:09 PM 4 159.00 56.48 102.52 30.60 -25.88 200.74 240 7.42 547 20.1 6.9 393 Clear,no odor MW-4 Intermediate 6/20/2011 Supplemental 11:29 AM 4 159.00 56.13 102.87 30.60 -25.53 201.43 240 7.23 506 20.6 6.3 260 Clear,no odor 7/21/2011 3rd Qtr. 3:49 PM 4 159.00 55.24 103.76 30.60 -24.64 203.17 240 7.73 425 21.9 6.8 231 Turbid,no odor 8/22/2011 Supplemental 11:09 AM 4 159.00 53.57 105.43 30.60 -22.97 206.44 240 7.57 409 20.3 5.6 248 Turbid,no odor 10/17/2011 4th Qtr. 11:29 AM 4 159.00 53.88 105.12 30.60 -23.28 205.84 240 7.59 443 20.1 5.0 175 Clear,no odor 12/8/2010 Baseline/4th Qtr. 8:42 AM 4 180.00 56.51 123.49 28.61 -27.90 241.81 240 7.58 653 19.0 3.8 254 Clear,no odor 1/25/2011 1st Qtr. 12:34 PM 4 180.00 56.26 123.74 28.61 -27.65 242.30 240 7.36 609 19.3 4.5 254 Clear,no odor 4/18/2011 2nd Qtr. 10:07 AM 4 180.00 52.59 127.41 28.61 -23.98 249.48 270 7.81 510 20.2 6.0 216 Clear,no odor 5/23/2011 Supplemental 1:57 PM 4 180.00 53.33 126.67 28.61 -24.72 248.03 270 7.42 542 20.5 3.8 307 Clear,no odor MW-212 Intermediate 6/20/2011 Supplemental 12:12 PM 4 180.00 52.91 127.09 28.61 -24.30 248.85 270 7.22 499 20.6 5.7 208 Clear,no odor 7/21/2011 3rd Qtr. 11:57 AM 4 180.00 50.90 129.10 28.61 -22.29 252.79 270 7.73 431 21.4 5.7 197 Clear,no odor 8/22/2011 Supplemental 9:26 AM 4 180.00 48.30 131.70 28.61 -19.69 257.88 270 7.55 402 19.8 5.5 322 Clear,no odor 10/13/2011 4th Qtr. 4:31 PM 4 180.00 50.32 129.68 28.61 -21.71 253.93 270 7.65 395 20.7 5.1 200 Clear,no odor 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 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 MW-7 Shallow 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 1 st 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 1/24/2012 1 st Qtr. 3:44 PM 4 100 52.90 47.10 29.78 -23.12 92.23 90 7.52 470 18.9 5.4 268 Clear,no odor 4/25/2012 2nd Qtr. 3:19 PM 4 100 51.51 48.49 29.78 -21.73 94.95 90 7.37 547 20.1 6.0 230 Turbid,no odor 2/4/2008 Background 3:16 PM 4 80 55.34 24.66 26.95 -28.39 52.20 60 7.38 1,063 18.0 6.57 67 Clear,no odor 4/2/2008 2nd Qtr./Compliance 11:40 AM 4 80 55.00 25.00 26.95 -28.05 37.20 60 9.32 1,022 18.8 7.8 126 Clear,no odor 5/20/2008 Supplemental 12:01 PM 4 80 54.02 25.98 26.95 -27.07 54.78 60 7.21 986 20.1 3.0 44 Clear,no odor 7/11/2008 3rd Qtr. 9:03 AM 4 80 55.22 24.78 26.95 -28.27 52.43 60 7.38 1,372 19.6 6.9 32 Clear,no odor 10/22/2008 4th Qtr./Compliance 9:19 AM 4 80 57.39 22.61 26.95 -30.44 48.28 60 7.27 1,149 18.3 7.9 250 Clear,no odor 1/9/2009 1st Qtr. 11:56 AM 4 80 58.47 21.53 26.95 -31.52 46.07 60 7.03 1,250 18.9 5.8 62 Clear,no odor 4/8/2009 4/8/2009 9:16 AM 4 80 59.00 21.00 26.95 -32.05 45.03 60 7.18 1,270 19.7 6.1 130 Clear,no odor 7/15/2009 3rd Qtr. 10:11 AM 4 82 60.17 21.83 26.95 -33.22 42.74 60 7.25 1,342 21.0 9.4 410 Clear,no odor 10/14/2009 4th Qtr. 2:31 PM 4 82 61.27 20.73 26.95 -34.32 40.59 60 7.36 1,306 20.5 4.9 57 Clear,no odor MW-201 Shallow 2/2/2010 1st Qtr. 2:22 PM 4 82 61.45 20.55 26.95 -34.50 40.23 60 7.35 1,454 18.7 7.7 204 Clear,no odor 4/14/2010 2nd Qtr. 4:46 PM 4 82 59.85 22.15 26.95 -32.90 43.37 60 7.18 1,377 19.5 6.7 216 Clear,no odor 7/8/2010 3rd Qtr. 1:20 PM 4 82 57.70 24.30 26.95 -30.75 47.58 60 7.13 1,283 20.6 7.9 125 Clear,no odor 10/13/2010 4th Qtr. 4:36 PM 4 82 56.64 25.36 26.95 -29.69 49.66 60 7.44 1,290 20.3 2.9 191 Clear,no odor 1/21/2011 1st Qtr. 6:41 PM 4 82 55.94 26.06 26.95 -28.99 51.03 60 7.21 1,236 18.6 7.6 286 Clear,no odor 4/14/2011 2nd Qtr. 3:02 PM 4 82 54.19 27.81 26.95 -27.24 54.45 60 7.48 1,086 19.1 7.6 172 Clear,no odor 7/21/2011 3rd Qtr. 8:51 AM 4 82 52.63 29.37 26.95 -25.68 57.51 60 7.32 846 20.0 8.0 245 Clear,no odor 10/13/2011 4th Qtr. 12:44 PM 4 82 51.03 30.97 26.95 -24.08 60.64 60 7.38 659 19.6 6.9 228 Clear,no odor 1/25/2012 1st Qtr. 1:16 PM 4 82 50.64 31.36 26.95 -23.69 61.41 60 7.34 611 19.0 5.8 276 Clear,no odor 4/30/2012 2nd Qtr. 8:51 AM 4 82 50.30 31.70 26.95 -23.35 62.07 60 7.11 720 19.4 6.6 257 Clear,no odor 1/9/2008 Background 1:21 PM 4 80 54.98 25.02 29.02 -25.96 36.24 60 7.65 509 16.9 6.59 228 Clear,no odor 4/l/2008 2nd Qtr./Compliance 12:30 PM 4 80 55.26 24.74 29.02 -26.24 52.35 60 7.41 759 19.5 5.9 82 Clear,no odor 7/10/2008 3rd Qtr. 2:56 PM 4 80 56.22 23.78 29.02 -27.20 54.39 60 7.36 969 22.0 7.9 -14 Clear,no odor 10/21/2008 4th Qtr./Compliance 11:10 AM 4 80 58.80 21.20 29.02 -29.78 45.42 60 7.40 826 18.9 7.3 169 Turbid,no odor 1/9/2009 1st Qtr. 9:46 AM 4 80 60.32 19.68 29.02 -31.30 42.45 60 6.69 846 18.5 5.1 96 Turbid,no odor 4/7/2009 2nd Qtr. 5:39 PM 4 80 61.00 19.00 29.02 -31.98 41.12 60 7.40 863 18.9 5.7 40 Turbid,no odor 7/14/2009 3rd Qtr. 2:26 PM 4 80 62.99 17.01 29.02 -33.97 37.22 60 7.30 977 21.0 6.9 159 Clear,no odor 10/12/2009 4th Qtr. 3:33 PM 4 80 65.99 14.01 29.02 -36.97 33.30 30 7.42 940 19.1 7.7 154 Clear,no odor 2/1/2010 1st Qtr. 6:01 PM 4 80 64.09 15.91 29.02 -35.07 35.06 30 7.51 1,172 18.3 8.5 152 Clear,no odor MW-202 Shallow 4/14/2010 2nd Qtr. 8:59 AM 4 80 61.94 18.06 29.02 -32.92 35.36 60 7.27 1,026 18.9 6.2 202 Clear,no odor 7/7/2010 3rd Qtr. 4:30 PM 4 80 56.31 23.69 29.02 -27.29 46.39 60 7.33 881 19.9 6.6 113 Clear,no odor 10/13/2010 4th Qtr. 9:23 AM 4 80 55.87 24.13 29.02 -26.85 47.25 60 7.49 839 19.2 5.8 216 Clear,no odor 1/21/2011 1st Qtr. 10:31 AM 4 80 56.58 23.42 29.02 -27.56 45.86 60 7.40 822 18.6 6.7 257 Clear,no odor 4/13/2011 2nd Qtr. 5:26 PM 4 80 52.83 27.17 29.02 -23.81 53.20 60 7.56 627 18.5 7.5 242 Clear,no odor 7/20/2011 3rd Qtr. 11:41 AM 4 80 51.54 28.46 29.02 -22.52 55.73 60 7.41 737 20.0 7.1 222 Clear,no odor 10/12/2011 4th Qtr. 4:16 PM 4 80 50.61 29.39 29.02 -21.59 57.55 60 7.60 546 20.1 5.1 246 Clear,no odor 1/25/2012 1st Qtr. 8:56 AM 4 80 51.55 28.45 29.02 -22.53 55.71 60 7.43 510 18.5 5.3 308 Clear,no odor 4/24/2012 2nd Qtr. 2:02 PM 4 80 50.60 29.40 29.02 -21.58 57.57 60 7.40 485 19.2 7.1 202 Clear,no odor Page 11 of 13