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TABLE 5 LABORATORY ANALYTICAL RESULTS 2013 SEMIANNUAL GROUNDWATER MONITORING REPORT FORMER MARLEY COOLING TOWER SITE STOCKTON,CALIFORNIA Page 20 of 25 Laboratory Analyses Screened Hexavalent Water-bearing Nitrate as N Calcium Chromium Chromium Manganese Well Zone Sample Date Event/Purpose m /L* Sulfate (mg/L (mg/L Arsenic N /L) (pg/L) N /L** Iron(pg/L) (pg/L) TDS(mg/L) TOC(mg/L Water Quality Objective 10 250 10 50 50 300 50 450 Background/Compliance Wells Continued MW-304 Shallow 1/21/2008 Background NA NA NA NA NA NA NA NA NA NA 4/1/2008 2nd Qtr./Compliance NA NA NA NA NA NA NA NA NA NA 7/10/2008 3rd Qtr./Compliance NA NA NA NA NA NA NA NA NA NA 10/22/2008 4th Qtr./Compliance 2.2 31.6 NA <5 24 <10 <100 <10 893J 5.8 1/9/2009 1st Qtr. NA NA NA NA NA NA NA NA NA NA 4/8/2009 2nd Qtr. NA NA NA NA NA NA NA NA NA NA 7/15/2009 3rd Qtr. NA 41.3 NA <5 20 <10 990 <10 864 1.7 10/14/2009 4th Qtr. NA 43.1 NA 3 14 <10 659 <10 904 1.9 2/2/2010 1 st Qtr. NA 44.2 NA 3 35 <10 726 <10 849 0.7U 4/14/2010 2nd Qtr. NA 41.8 NA 3 8 <10 444 <10 823 0.5U 7/8/2010 3rd Qtr. NA 44.2 NA 3J 27 10 714 <10 848 0.8J 10/13/2010 4th Qtr. NA 41.7 NA 5 20 <10 703 <10 843 1.0 1/21/2011 1st Qtr. NA 39.6 NA 4J 27 8.06 313J 5UJ 848 <1.0 4/13/2011 2nd Qtr. NA 39.9 NA 3J 15 8.04 424 <10 856 0.7J 7/20/2011 3rd Qtr. NA 41.1 NA 3J 17 <10 569 <10 856 <1.0 10/12/2011 4th Qtr. NA 42.4 NA 2J 6J 3.13 418 <10 859 0.5J 1/25/2012 1st Qtr. NA 43.4 NA 3J 10 9.03 417 <10 849 1.3 4/26/2012 2nd Qtr. NA 41.6 NA 4J 12 8.27 353 <10 828 1.2 7/24/2012 3rd Qtr NA 41.8 NA 3J 16 8.32 383 <10 853 0.8J 10/24/2012 4th Qtr NA NA NA NA 11 NA NA NA NA NA 1/29/2013 1st Qtr. NA NA NA NA 10 NA NA NA NA NA 4/11/2013 2nd Qtr. NA NA NA NA 11 NA NA NA NA NA MW-401 Shallow 1/9/2008 Background 3.7 16.9 NA <5 <10 <10 93 <10 284 <1.0 7/10/2008 3rd Qtr./Compliance 2.3 16.2 NA <5 <10 <10 157 <10 252 <1.0 10/22/2008 4th Qtr./Compliance 2.4 14.3.1 NA 5 <10 <10 <100 <10 229J 4.OJ 1/8/2009 1st Qtr. 1.8 20.3 J NA 6 11 <10 <100 <10 236 <1.0 4/7/2009 2nd Qtr. 2.7 17.4 NA 5 <10 <10 130 <10 253 11 7/14/2009 3rd Qtr. NA 16.2 NA <5 <10 <10 115 <10 230 1.2 10/12/2009 4th Qtr. NA 15.9 NA 5 5 <10 119 <10 247 1.7 2/1/2010 1st Qtr. NA 17.7 NA 4 6 <10 152 <10 266 0AU 4/13/2010 2nd Qtr. NA 16.2 NA 5 7 <10 <50 <10 283 1.2 7/7/2010 3rd Qtr NA 14.1 NA 5 4J <10 124 <10 235 0.7J 10/12/2010 4th Qtr. NA 14.2 NA 4J 5J <10 69 <10 219 1.4 1/20/2011 1st Qtr. NA 14.OJ NA 6 <10 0.98 39J <10 257 0.81 4/13/2011 2nd Qtr. NA 13.4 NA 5 3J 0.74 120 <10 218 1.3 7/19/2011 3rd Qtr. NA 14.0 NA 5 <10 <10 57 <10 225 <1.0 10/12/2011 4th Qtr. NA 19.4 NA 4J <10 <0.5 99 20 237 0.91 1/24/2012 1st Qtr. NA 22.3 NA 4J <10 1.15 74 <10 245 1.3 4/24/2012 2nd Qtr. NA 21.2 NA 5 <10 1.11 70 <10 253 1.3 7/23/2012 3rd Qtr NA 24.4 NA 4J 3J 1.22 69 <10 324 0.6J 10/23/2012 4th Qtr NA NA NA NA <10 NA NA NA NA NA 1/24/2013 1st Qtr. NA NA NA NA <10 NA NA NA NA NA