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TABLE 5 LABORATORY ANALYTICAL RESULTS 2013 SEMIANNUAL GROUNDWATER MONITORING REPORT FORMER MARLEY COOLING TOWER SITE STOCKTON,CALIFORNIA Page 7 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(gg/L) (Ng/L) TDS(mg/L) TOC(mg/L Water Quality Objective 10 250 10 50 50 300 50 450 In'ection Area Wells Continued MW-301 Shallow 4/2/2008 2nd Qtr. 14.8 30.4 NA <5 108 100 335 <10 804 <1.0 7/11/2008 3rd Qtr. 20.7 41.2 NA <5 100 90 1,200 <10 876 <1.0 10/22/2008 4th Qtr. 16.3 36.0 NA <5 86 80 <100 <10 861J 1.4 1/9/2009 1st Qtr. 17.1 29.8 NA <5 97 50 <100 <10 954 <1.0 4/8/2009 2nd Qtr. 19.7 31.7 NA <5 90 90 667 <10 898 1.3 J 7/15/2009 3rd Qtr. NA 36.1 NA <5 95 100 1,080 <10 816 1.9 10/15/2009 4th Qtr. NA 35.6 NA 3 86 100 735 <10 855 1.3 10/15/2009 4th Qtr.(Dup) NA 35.7 NA 3 91 120 708 <10 856 1.5 2/2/2010 1 st Qtr. NA 42.8 NA 2 88 80 918 <10 873 0.6 4/15/2010 2nd Qtr. NA 44.7 NA 3 125 120 682 <10 806 0.7U 7/8/2010 3rd Qtr. NA 47.3 NA 3J 130 120 782 <10 832 0.91 10/14/2010 4th Qtr. NA 68.6 NA 2J 144 140 1,040 <10 860 1.0 4/18/2011 2nd Qtr. NA 56.7 NA 3J 90 89.5 284 <10 872 0AJ 7/20/2011 3rd Qtr. NA 44.2 NA 2J 100 100 663 <10 807 1.11 10/13/2011 4th Qtr. NA 35.3 NA 2J 135 135.0 563 <10 941 0.5J 1/25/2012 1st Qtr. NA 33.7 NA 2J 195 110 133 8J 935 1.6 4/30/2012 2nd Qtr. NA 41.1 NA 2J 63 59.6 399 130 989 2.8 4/30/2012 2nd Qtr.(Dup) NA 40.5 NA 2J 62 59.0 400 130 966 2.9 7/18/2012 3rd Qtr NA 73.3 NA 2J 49 42.7 596 150 1,150 2.3 10/24/2012 4th Qtr NA 105.0 NA 2J 24 23.2 745 110 961 2.2 1/29/2013 1st Qtr. NA 65.6 NA 2J 10 7.1 638 150 906 1.6 4/11/2013 2nd Qtr. NA 42.5 NA 2J 12 9.29 418 130 881 1.6 4/11/2013 2nd Qtr.(Dup) NA 42.6 NA 2J 12 9.13 432 130 907 1.7 MW-303 Shallow 4/2/2008 Baseline/2nd Qtr 18.4 34.9 NA <5 94 90 452 <10 852 <1.0 5/20/2008 Supplemental 17.8 44.6 NA <5 88 70 538 <10 848J 2.0 7/11/2008 3rd Qtr. 7.2 35.0 NA 6 <10 <10 1,280 4,200 863 42.0 10/21/2008 4th Qtr. 14.3 38.1 NA <5 62 30 <100 1,300 532 3.1 1/9/2009 1st Qtr. 15.4 39.6 NA <5 89 40 <100 480 838 1.7 4/8/2009 2nd Qtr. 10.3 34.6 NA <5 47 30 648 J 170 807 1.4 J 7/15/2009 3rd Qtr. NA 16.7 NA 9 14 10 1,120 5,020 856 23.0 7/15/2009 3rd Qtr.(Dup) NA 16.4 NA 8 <10 <10 1,140 5,000 878 23.0 10/14/2009 4th Qtr. NA 13.9 NA 3 6 <10 1,400 5,380 938 24.0 2/2/2010 1st Qtr. NA 9.9 NA 3 37 <10 1,560 4,910 937 6.9 4/14/2010 2nd Qtr. NA 14.3 NA 2 27J <10 1,060 4,160 891 3.0 7/8/2010 3rd Qtr. NA 66.5 NA 3J 22 <10 1,270 3,650 887 2.3 10/14/2010 4th Qtr. NA 129 NA 11 18 <10 1,870 3,680 880 2.2 1/25/2011 1st Qtr. NA 92.6 NA 4J 23 <0.2 1,710 3,630 888 1.3J 4/14/2011 2nd Qtr. NA 110 NA 8 12 <0.2 2,220 3,650 893 1.3 7/21/2011 3rd Qtr. NA 89 NA 7 3J <10 1,570 4,460 896 1.2 10/13/2011 4th Qtr. NA 80.1 NA 8 5J <0.5 716 3,570 940 0.91 1/25/2012 1st Qtr. NA 32.7 NA 7 3J <0.5 1,250 3,430 826 1.5 4/25/2012 2nd Qtr. NA 26.1 NA 9 5J <0.5 885 4,490 785 1.6 4/25/2012 2nd Qtr.(Dup) NA 26.5 NA 9 4J <0.5 883 4,620 774 1.6 7/24/2012 3rd Qtr NA 29.6 NA 8 5J <0.5 582 3,960 770 1.0 10/23/2012 4th Qtr NA 32.1 NA 9 3J <0.5 468 3,430 883 2.3 10/23/2012 4th Qtr(Dup) NA 31.3 NA 9 3J <0.5 480 3,460 883 0.81 1/25/2013 1st Qtr. NA 31.3 NA 9 4J <0.5 520 3,260 773 0.81 4/10/2013 2nd Qtr. NA 38.9 NA 8 <10 <0.5 356 3,060 776 1.0