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TABLE 4 FIELD PARAMETERS AND WELL DETAILS 2013 SEMIANNUAL GROUNDWATER MONITORING REPORT FORMER MARLEY COOLING TOWER SITE STOCKTON,CALIFORNIA Page 18 of 18 Field Parameters Top of Depth to Water Casing Groundwater Calc Dissolved Screened Water- Well 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 Diameter(in) (ft-btoc) (ft-btoc) Length(ft) (ft-amsl) (ft-amsl) (gal) (gal) units) (PS/CM) (°C) (mg/L) (mV) Observations Background/Compliance Wells(Continued) 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 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 MW-325 Intermediate 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 1/25/2013 1st Qtr. 4:11 PM 4 186 47.93 138.07 26.05 -21.88 270.35 270 7.22 572 19.0 5.2 242 Clear,no odor 4/10/2013 2nd Qtr. 7:07 PM 4 186 48.06 137.94 26.05 -22.01 270.10 270 7.43 789 19.9 4.8 244 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 pS/cm=micro Siemens per centimeter gal=gallon Temp=temperature °C=degrees Celcius in=inch