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TABLE 4 FIELD PARAMETERS AND WELL DETAILS 2012 ANNUAL GROUNDWATER MONITORING REPORT FORMER MARLEY COOLING TOWER SITE STOCKTON,CALIFORNIA Page 17 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 1/21/2008 Background 12:02 PM 4 125 54.30 70.70 26.26 -28.04 102.21 120 7.72 543 17.1 5.73 143 Clear,no odor 4/1/2008 2nd Qtr./Compliance 3:55 PM 4 125 54.60 70.40 26.26 -28.34 137.85 150 7.59 649 19.4 4.8 154 Clear,no odor 7/10/2008 3rd Qtr. 10:20 AM 4 125 55.60 69.40 26.26 -29.34 135.89 150 7.68 752 20.3 8.8 94 Clear,no odor 10/21/2008 4th Qtr./Compliance 12:53 PM 4 125 56.90 68.10 26.26 -30.64 49.14 60 7.26 1,054 19.5 8.7 232 Clear,no odor 1/9/2009 1st Qtr. 1:53 PM 4 125 57.21 67.79 26.26 -30.95 132.23 150 6.76 780 18.4 5.0 -1 Clear,no odor 4/7/2009 2nd Qtr. 5:00 PM 4 125 57.71 67.29 26.26 -31.45 131.76 150 7.42 912 19.4 5.3 67 Clear,no odor 7/14/2009 3rd Qtr. 1:55 PM 4 125 58.63 66.37 26.26 -32.37 129.95 150 7.17 1,215 21.4 9.2 187 Clear,no odor 10/12/2009 4th Qtr. 3:02 PM 4 125 59.86 65.14 26.26 -33.60 127.55 150 7.27 1,082 20.0 9.3 130 Clear,no odor 2/1/2010 1st Qtr. 5:20 PM 4 125 60.04 64.96 26.26 -33.78 127.19 150 7.45 1,293 18.6 8.4 212 Clear,no odor 4/13/2010 2nd Qtr. 5:30 PM 4 125 58.89 66.11 26.26 -32.63 129.45 150 7.07 1,241 19.6 8.6 206 Clear,no odor MW-310 100-Foot Sand 7/7/2010 3rd Qtr. 4:05 PM 4 125 56.86 68.14 26.26 -30.60 133.42 150 7.24 1,126 21.0 7.6 125 Clear,no odor 10/13/2010 4th Qtr. 8:45 AM 4 125 56.31 68.69 26.26 -30.05 134.50 150 7.17 1,153 19.2 7.1 230 Clear,no odor 1/21/2011 1st Qtr. 9:45 AM 4 125 55.22 69.78 26.26 -28.96 136.64 150 7.08 1,162 17.8 9.3 300 Clear,no odor 4/13/2011 2nd Qtr. 4:35 PM 4 125 53.91 71.09 26.26 -27.65 139.20 150 7.24 773 19.5 7.6 223 Clear,no odor 7/20/2011 3rd Qtr. 10:35 AM 4 125 52.23 72.77 26.26 -25.97 142.49 150 7.25 911 20.1 7.5 236 Clear,no odor 10/12/2011 4th Qtr. 3:17 PM 4 125 50.24 74.76 26.26 -23.98 146.39 150 7.38 630 21.2 6.4 237 Clear,no odor 1/24/2012 1st Qtr. 1:15 PM 4 125 50.19 74.81 26.26 -23.93 146.49 150 7.36 550 19.0 7.5 260 Clear,no odor 4/24/2012 2nd Qtr. 5:55 PM 4 125 49.50 75.50 26.26 -23.24 147.84 150 7.25 530 19.8 9.1 200 Clear,no odor 7/24/2012 3rd Qtr 1:50 PM 4 125 49.23 75.77 26.26 -22.97 148.37 150 7.23 491 20.5 8.4 198 Clear,no odor 10/24/2012 4th Qtr 9:35 AM 4 125 49.53 75.47 26.26 -23.27 147.78 150 7.10 632 18.5 7.4 272 Clear,no odor 1/21/2008 Background 11:16 AM 4 180 53.72 126.28 29.60 -24.12 101.87 120 7.81 552 14.8 5.32 173 Clear,no odor 4/1/2008 2nd Qtr./Compliance 3:32 PM 4 180 55.79 124.21 29.60 -26.19 97.68 120 7.67 589 19.1 5.7 189 Clear,no odor 7/10/2008 3rd Qtr. 9:39 AM 4 180 56.75 123.25 29.60 -27.15 245.25 240 7.60 616 20.0 6.9 84 Clear,no odor 10/21/2008 4th Qtr./Compliance 12:04 PM 4 180 59.32 120.68 29.60 -29.72 240.21 240 7.48 598 18.5 4.3 191 Clear,no odor 1/8/2009 1st Qtr. 1:39 PM 4 180 60.98 119.02 29.60 -31.38 236.96 240 7.30 622 17.8 3.5 137 Clear,no odor 4/7/2009 2nd Qtr. 2:38 PM 4 180 61.92 118.08 29.60 -32.32 235.12 240 7.43 687 18.2 2.7 153 Clear,no odor 7/14/2009 3rd Qtr. 12:14 PM 4 180 64.71 115.29 29.60 -35.11 229.66 240 7.32 719 20.7 4.2 166 Clear,no odor 10/12/2009 4th Qtr. 12:54 PM 4 180 66.68 113.32 29.60 -37.08 225.80 240 7.42 673 19.4 4.1 177 Clear,no odor 2/1/2010 1st Qtr. 3:32 PM 4 180 64.01 115.99 29.60 -34.41 231.03 240 7.64 760 18.0 3.8 199 Clear,no odor 4/13/2010 2nd Qtr. 4:04 PM 4 180 61.78 118.22 29.60 -32.18 231.49 240 7.29 730 18.5 4.6 190 Clear,no odor MW-211 Intermediate 7/7/2010 3rd Qtr. 2:38 PM 4 180 56.60 123.40 29.60 -27.00 241.63 270 7.28 683 19.9 2.9 136 Clear,no odor 10/12/2010 4th Qtr. 6:12 PM 4 180 55.58 124.42 29.60 -25.98 243.63 270 7.73 662 18.9 3.6 184 Clear,no odor 1/20/2011 1st Qtr. 2:19 PM 4 180 56.61 123.39 29.60 -27.01 241.61 240 7.59 608 18.3 5.8 252 Clear,no odor 4/13/2011 2nd Qtr. 12:07 PM 4 180 50.50 129.50 29.60 -20.90 253.57 270 7.67 529 17.5 5.3 243 Clear,no odor 7/19/2011 3rd Qtr. 4:57 PM 4 180 48.70 131.30 29.60 -19.10 257.10 270 7.54 560 19.3 5.6 219 Clear,no odor 10/12/2011 4th Qtr. 12:27 PM 4 180 50.18 129.82 29.60 -20.58 254.20 270 7.78 358 19.7 4.8 242 Clear,no odor 1/24/2012 1st Qtr. 11:57 AM 4 180 51.54 128.46 29.60 -21.94 251.54 270 7.44 367 19.6 4.1 276 Clear,no odor 4/24/2012 2nd Qtr. 3:12 PM 4 180 49.44 130.56 29.60 -19.84 255.65 270 7.41 357 18.7 4.1 184 Clear,no odor 7/24/2012 3rd Qtr 8:57 AM 4 182 50.66 131.34 29.60 -21.06 257.18 270 7.07 390 18.5 2.8 300 Clear,no odor 10/23/2012 4th Qtr 1:07 PM 4 180 52.62 127.38 29.60 -23.02 249.42 270 7.30 381 18.0 7.4 204 Clear,no odor 1/21/2008 Background 12:32 PM 4 186 54.37 131.63 26.05 -28.32 102.07 120 7.85 501 16.9 6.12 164 Clear,no odor 4/1/2008 2nd Qtr./Compliance 1:26 PM 4 186 54.45 131.55 26.05 -28.40 255.62 270 7.73 509 19.2 5.7 125 Clear,no odor 7/10/2008 3rd Qtr. 3:42 PM 4 186 55.59 130.41 26.05 -29.54 253.39 270 7.66 567 21.9 7.7 32 Clear,no odor 10/21/2008 4th Qtr./Compliance 2:34 PM 4 186 56.04 129.96 26.05 -29.99 252.51 270 7.35 910 20.3 7.4 247 Clear,no odor 1/12/2009 1st Qtr. 10:37 AM 4 186 56.98 129.02 26.05 -30.93 250.67 270 8.17 581 18.8 6.1 132 Clear,no odor 4/7/2009 2nd Qtr. 12:17 PM 4 186 57.74 128.26 26.05 -31.69 249.18 270 7.51 622 19.7 3.9 124 Clear,no odor 7/14/2009 3rd Qtr. 10:55 AM 4 186 58.68 127.32 26.05 -32.63 247.34 270 7.25 1,030 21.3 8.9 136 Clear,no odor 10/12/2009 4th Qtr. 11:47 AM 4 186 59.74 126.26 26.05 -33.69 245.27 270 7.34 955 20.0 8.7 239 Clear,no odor 2/1/2010 1st Qtr. 1:44 PM 4 186 60.12 125.88 26.05 -34.07 245.70 270 7.56 1,076 18.6 8.0 190 Clear,no odor 4/13/2010 2nd Qtr. 2:48 PM 4 186 58.86 127.14 26.05 -32.81 248.95 270 7.22 825 19.2 6.9 212 Clear,no odor MW-325 Intermediate 7/7/2010 3rd Qtr. 12:31 PM 4 186 56.90 129.10 26.05 -30.85 252.79 270 7.19 706 20.5 6.0 261 Clear,no odor 10/12/2010 4th Qtr. 4:54 PM 4 186 56.03 129.97 26.05 -29.98 254.49 270 7.66 774 20.0 6.9 167 Clear,no odor 1/20/2011 1st Qtr. 1:00 PM 4 186 55.19 130.81 26.05 -29.14 256.14 270 7.47 948 19.7 5.6 235 Clear,no odor 4/13/2011 2nd Qtr. 10:37 AM 4 186 53.70 132.30 26.05 -27.65 259.06 270 7.51 483 18.4 5.3 257 Clear,no odor 7/19/2011 3rd Qtr. 2:58 PM 4 186 51.93 134.07 26.05 -25.88 262.52 270 8.59 184 20.2 3.2 201 Clear,no odor 10/12/2011 4th Qtr. 11:03 AM 4 186 50.58 135.42 26.05 -24.53 265.17 270 7.85 382 20.3 3.4 257 Turbid,no odor 1/24/2012 1st Qtr. 1:52 PM 4 186 50.09 135.91 26.05 -24.04 266.13 270 7.46 489 18.6 7.2 263 Clear,no odor 4/24/2012 2nd Qtr. 6:37 PM 4 186 49.37 136.63 26.05 -23.32 267.54 270 7.31 466 20.2 6.9 194 Clear,no odor 7/24/2012 3rd Qtr 1:21 PM 4 184 49.43 134.57 26.05 -23.38 263.50 270 7.43 401 20.1 6.8 162 Clear,no odor 10/23/2012 4th Qtr 5:32 PM 4 186 49.31 136.69 26.05 -23.26 267.65 270 7.23 449 19.1 9.2 168 Clear,no odor Notes: Background/Compliance values represent conditions outside the current established chromium plume boundary,and areas of anticipated treatment. EC=Electrical Conductivity mg/L=milligrams per liter Baseline values represent conditions within and around the current established plume boundary,and areas of anticipated treatment,prior to treatment. ft=feet mV=millivolts Quarterly wells were established for the program to track treatment performance by quarter(typically sampled in January,April,July,October). ft-btoc=feet below top of casing NA-Not Available Calculated Purge Volume estimated based on approximately 3 times water column volume. ft-amsl=feet above mean sea level ORP=Oxidation Reduction Potential µS/cm=micro Siemens per centimeter gal=gallon Temp=temperature °C=degrees Celcius in=inch