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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 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 4 185 57.74 127.26 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 4 185 58.68 126.32 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 4 185 59.74 125.26 26.05 -33.69 245.27 270 7.34 955 20.0 8.7 239 Clear,no odor MW-325 Intermediate 2/1/2010 1st Qtr. 1:44 PM 4 185 60.12 124.88 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 4 185 58.86 126.14 26.05 -32.81 246.99 270 7.22 825 19.2 6.9 212 Clear,no odor 7/7/2010 3rd Qtr. 12:31 PM 4 185 56.90 128.10 26.05 -30.85 250.83 270 7.19 706 20.5 6.0 261 Clear,no odor 10/12/2010 4th Qtr. 4:54 PM 4 185 56.03 128.97 26.05 -29.98 252.54 270 7.66 774 20.0 6.9 167 Clear,no odor 1/20/2011 1st Qtr. 1:00 PM 4 185 55.19 129.81 26.05 -29.14 254.18 270 7.47 948 19.7 5.6 235 Clear,no odor 4/13/2011 2nd Qtr. 10:37 AM 4 185 53.70 131.30 26.05 -27.65 257.10 270 7.51 483 18.4 5.3 257 Clear,no odor 7/19/2011 3rd Qtr. 2:58 PM 4 185 51.93 133.07 26.05 -25.88 260.56 270 8.59 184 20.2 3.2 201 Clear,no odor 10/12/2011 4th Qtr. 11:03 AM 4 185 50.58 134.42 26.05 -24.53 263.21 270 7.85 382 20.3 3.4 257 Turbid,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 Page 13 of 13