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TABLE 4 FIELD PARAMETERS AND WELL DETAILS 2012 ANNUAL GROUNDWATER MONITORING REPORT FORMER MARLEY COOLING TOWER SITE STOCKTON,CALIFORNIA Page 15 of 17 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 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 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 MW-201 Shallow 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 7/24/2012 3rd Qtr 3:04 PM 4 82 49.75 32.25 26.95 -22.80 63.15 60 7.42 540 19.7 7.7 197 Clear,no odor 10/24/2012 4th Qtr 10:21 AM 4 80 50.19 29.81 26.95 -23.24 58.37 60 7.26 694 19.1 9.3 253 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 4/1/2008 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 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 MW-202 Shallow 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 7/24/2012 3rd Qtr 2:41 PM 4 82 50.72 31.28 29.02 -21.70 61.25 60 7.42 423 20.7 7.4 190 Clear,no odor 10/24/2012 4th Qtr 8:36 AM 4 80 50.31 29.69 29.02 -21.29 58.14 60 7.02 644 18.7 9.8 357 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 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 MW-210 Shallow 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 1/24/2012 1st Qtr. 11:21 AM 4 82 51.54 30.46 29.67 -21.87 59.64 60 7.07 399 17.8 5.8 248 Clear,no odor 4/24/2012 2nd Qtr. 2:36 PM 4 82 49.36 32.64 29.67 -19.69 63.91 60 7.52 346 19.1 5.9 206 Clear,no odor 7/24/2012 3rd Qtr 9:16 AM 4 82 50.69 31.31 29.67 -21.02 61.31 60 7.05 402 18.6 5.8 271 Clear,no odor 10/23/2012 4th Qtr 12:26 PM 4 82 51.89 30.11 29.67 -22.22 58.96 15 7.29 399 18.1 10.4 206 Turbid,no odor