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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) O'S/cm) (°C) (mg/L) (mV) Observations Background/Compliance Wells Continued 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 MW-201 Shallow 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 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 1/9/2008 Background 1:21 PM 4 80 54.98 25.02 29.62 -25.36 36.24 60 7.65 509 16.9 6.59 228 Clear,no odor 4/1/2008 2nd Qtr./Compliance 12:30 PM 4 80 55.26 24.74 29.62 -25.64 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 29.62 -26.60 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 29.62 -29.18 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 29.62 -30.70 42.45 60 6.69 846 18.5 5.1 96 Turbid,no odor 4/7/2009 2nd Qtr. 5:39 PM 4 82 61.00 21.00 29.62 -31.38 41.12 60 7.40 863 18.9 5.7 40 Turbid,no odor 7/14/2009 3rd Qtr. 2:26 PM 4 82 62.99 19.01 29.62 -33.37 37.22 60 7.30 977 21.0 6.9 159 Clear,no odor 10/12/2009 4th Qtr. 3:33 PM 4 82 65.99 16.01 29.62 -36.37 33.30 30 7.42 940 19.1 7.7 154 Clear,no odor MW-202 Shallow 2/1/2010 1st Qtr. 6:01 PM 4 82 64.09 17.91 29.62 -34.47 35.06 30 7.51 1,172 18.3 8.5 152 Clear,no odor 4/14/2010 2nd Qtr. 8:59 AM 4 82 61.94 20.06 29.62 -32.32 39.28 60 7.27 1,026 18.9 6.2 202 Clear,no odor 7/7/2010 3rd Qtr. 4:30 PM 4 82 56.31 25.69 29.62 -26.69 50.30 60 7.33 881 19.9 6.6 113 Clear,no odor 10/13/2010 4th Qtr. 9:23 AM 4 82 55.87 26.13 29.62 -26.25 51.17 60 7.49 839 19.2 5.8 216 Clear,no odor 1/21/2011 1st Qtr. 10:31 AM 4 82 56.58 25.42 29.62 -26.96 49.77 60 7.40 822 18.6 6.7 257 Clear,no odor 4/13/2011 2nd Qtr. 5:26 PM 4 82 52.83 29.17 29.62 -23.21 57.12 60 7.56 627 18.5 7.5 242 Clear,no odor 7/20/2011 3rd Qtr. 11:41 AM 4 82 51.54 30.46 29.62 -21.92 59.64 60 7.41 737 20.0 7.1 222 Clear,no odor 10/12/2011 4th Qtr. 4:16 PM 4 82 50.61 31.39 29.62 -20.99 61.46 60 7.60 546 20.1 5.1 246 Clear,no odor 1/9/2008 Background 11:53 AM 4 82 53.55 28.45 29.67 -23.88 55.70 60 7.50 407 16.9 5.91 320 Clear,no odor 4/1/2008 2nd Qtr./Compliance 11:16 AM 4 82 55.32 26.68 29.67 -25.65 52.24 60 7.50 583 18.0 6.1 90 Clear,no odor 7/10/2008 3rd Qtr. 1:44 PM 4 82 56.42 25.58 29.67 -26.75 50.08 60 7.48 652 20.6 6.8 81 Clear,no odor 10/21/2008 4th Qtr./Compliance 11:34 AM 4 82 58.96 23.04 29.67 -29.29 45.11 60 7.31 689 18.6 5.0 144 Turbid,no odor 1/8/2009 1st Qtr. 1:10 PM 4 82 60.61 21.39 29.67 -30.94 41.88 60 6.45 741 17.8 2.7 128 Clear,no odor 4/7/2009 2nd Qtr. 10:57 AM 4 82 61.47 20.53 29.67 -31.80 40.19 60 7.30 665 18.8 2.8 201 Clear,no odor 7/14/2009 3rd Qtr. 9:40 AM 4 82 64.04 17.96 29.67 -34.37 35.16 60 7.15 678 19.4 1.4 120 Clear,no odor 10/12/2009 4th Qtr. 10:34 AM 4 82 66.29 15.71 29.67 -36.62 30.76 30 7.42 641 18.9 2.4 200 Turbid,no odor MW-210 Shallow 2/1/2010 1st Qtr. 12:26 PM 4 82 63.55 18.45 29.67 -33.88 36.12 60 7.36 702 18.7 5.3 188 Turbid,no odor 4/13/2010 2nd Qtr. 1:32 PM 4 82 61.82 20.18 29.67 -32.15 39.51 60 7.06 640 17.9 4.5 240 Clear,no odor 7/7/2010 3rd Qtr. 11:06 AM 4 82 54.39 27.61 29.67 -24.72 54.06 60 6.89 613 18.5 4.9 282 Clear,no odor 10/12/2010 4th Qtr. 3:32 PM 4 82 54.91 27.09 29.67 -25.24 53.04 60 7.56 768 19.2 6.0 186 Clear,no odor 1/20/2011 1st Qtr. 11:26 AM 4 82 56.31 25.69 29.67 -26.64 50.30 60 7.29 696 18.0 5.8 311 Clear,no odor 4/13/2011 2nd Qtr. 9:16 AM 4 82 50.43 31.57 29.67 -20.76 61.82 60 7.35 583 17.6 6.5 249 Clear,no odor 7/19/2011 3rd Qtr. 1:29 PM 4 82 49.07 32.93 29.67 -19.40 64.48 90 7.34 578 19.2 6.2 273 Clear,no odor 10/12/2011 4th Qtr. 9:49 AM 4 82 49.82 32.18 29.67 -20.15 63.01 60 7.39 522 18.4 6.8 353 Clear,no odor 1/9/2008 Background 10:21 AM 4 83 56.18 26.82 32.85 -23.33 43.97 60 7.45 367 17.7 2.68 480 Clear,no odor 4/1/2008 2nd Qtr./Compliance 10:00 AM 4 83 56.77 26.23 32.85 -23.92 51.36 60 7.43 599 18.5 4.0 70 Clear,no odor 7/10/2008 3rd Qtr. 1:01 PM 4 83 57.51 25.49 32.85 -24.66 49.91 60 7.53 703 20.6 4.2 86 Clear,no odor 10/21/2008 4th Qtr./Compliance 12:17 PM 4 83 60.43 22.57 32.85 -27.58 44.19 60 7.43 663 19.1 3.7 192 Clear,no odor 1/9/2009 1st Qtr. 9:11 AM 4 83 62.26 20.74 32.85 -29.41 40.61 60 6.84 687 17.7 2.2 391 Turbid,no odor 4/7/2009 2nd Qtr. 7:11 AM 4 83 62.95 20.05 32.85 -30.10 39.25 60 7.36 855 18.8 4.8 63 Clear,no odor 7/14/2009 3rd Qtr. 4:05 PM 4 83 65.04 17.96 32.85 -32.19 35.16 60 7.35 793 21.7 5.1 52 Clear,no odor 10/12/2009 4th Qtr. 4:48 PM 4 83 67.25 15.75 32.85 -34.40 30.84 30 7.47 671 18.7 3.5 118 Clear,no odor MW-302 Shallow 2/1/2010 1st Qtr. 7:15 AM 4 83 65.82 17.18 32.85 -32.97 33.64 30 7.61 647 17.5 6.0 216 Clear,no odor 4/14/2010 2nd Qtr. 10:24 AM 4 83 63.84 19.16 32.85 -30.99 37.52 60 7.43 602 18.6 3.9 223 Clear,no odor 7/7/2010 3rd Qtr. 5:49 PM 4 83 58.33 24.67 32.85 -25.48 48.31 60 7.31 585 19.5 3.7 120 Clear,no odor 10/13/2010 4th Qtr. 10:56 AM 4 83 57.01 25.99 32.85 -24.16 50.89 60 7.54 584 19.1 3.6 179 Clear,no odor 1/21/2011 1st Qtr. 12:21 PM 4 83 57.98 25.02 32.85 -25.13 48.99 60 7.44 548 18.2 6.0 267 Clear,no odor 4/14/2011 2nd Qtr. 8:07 PM 4 83 54.31 28.69 32.85 -21.46 56.18 60 7.19 457 17.9 5.3 212 Clear,no odor 7/20/2011 3rd Qtr. 12:56 PM 4 83 52.51 30.49 32.85 -19.66 59.70 60 7.61 440 19.2 5.9 202 Clear,no odor 10/12/2011 4th Qtr. 6:06 PM 4 83 51.52 31.48 32.85 -18.67 61.64 60 7.46 455 18.8 6.0 232 Clear,no odor Page 11 of 13