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TABLE 5 LABORATORY ANALYTICAL RESULTS 2012 ANNUAL GROUNDWATER MONITORING REPORT FORMER MARLEY COOLING TOWER SITE STOCKTON,CALIFORNIA Laboratory Analyses Screened Hexavalent Water-bearing Nitrate as N Calcium Chromium Chromium Manganese Well Zone Sample Date Event/Purpose (mg/L)' Sulfate(mg/L) (mg/L) Arsenic(ug/L) (Ng/L) (Ng/L)" Iron(lag/L) (Ng/L) TDS(mg/L) TOC(mg/L) Water Quality Objective 10 250 10 50 50 300 50 450 Injection Area Wells Continued EW-5 Intermediate 12/8/2010 4th Qtr. NA 16.2 NA 4J 55 54.6 206 <10 388 0.7J 1/25/2011 1st Qtr. NA 14.5 NA 4J 54 52.7 96 <10 391 <1.0 4/18/2011 2nd Qtr. NA 13.7 NA 5 18 8.42 44J 5J 345 0.2J 7/21/2011 3rd Qtr. NA 15.2 NA 4J 16 10 264 <10 378 <1.0 10/13/2011 4th Qtr. NA 16.4 NA 3J 13 13.2 165 <10 378 0.3J MW-4 Intermediate 12/6/2010 4th Qtr. NA 26.9 NA 5 770 696 187 <10 489 0AJ 12/6/2010 4th Qtr.(Dup) NA 26.6 NA 5 772 694 224 <10 525 0.5J 1/25/2011 1st Qtr. NA 26.3 NA 4J 800 765 131 <10 511 <1.0 4/18/2011 2nd Qtr. NA 20.1 NA 5 524 516 40J <10 350 0.11 4/18/2011 2nd Qtr.(Dup) NA 21.7 NA 5 517 507 26J <10 370 <1.0 5/23/2011 Supplemental NA NA NA NA 691 620 235 <10 NA <1.0 6/20/2011 Supplemental NA NA NA NA 686 660 168 <10 NA <1.0 7/21/2011 3rd Qtr. NA 22.4 NA 4J 586 360 279 <10 373 <1.0 8/22/2011 Supplemental NA NA NA NA 589 559 76 <10 NA 0.5J 10/17/2011 4th Qtr. NA 25.6 NA 5 521 520 196 <10 473 0.2J 10/17/2011 4th Qtr.(Dup) NA 25.4 NA 5 521 521 190 <10 428 0.2J MW-212 Intermediate 12/8/2010 4th Qtr. NA 22.0 NA 5 132 131 294 <10 438 0.7J 1/25/2011 1st Qtr. NA 22.7 NA 4J 140 136 147 <10 424 <1.0 1/25/2011 1stQtr.(Dup) NA 22.5 NA 4J 139 134 150 <10 437 <1.0 4/18/2011 2nd Qtr. NA 18.5 NA 6 87 82.1 51 <10 378 0.2J 5/23/2011 Supplemental NA NA NA NA 100 100 198 <10 NA <1.0 6/20/2011 Supplemental NA NA NA NA 99 110 140 <10 NA <1.0 7/21/2011 3rd Qtr NA 18.4 NA 4J 80 60 227 <10 367.0 <1.0 8/22/2011 Supplemental NA NA NA NA 76 72.4 66 <10 NA 0.6J 10/13/2011 4th Qtr. NA 18.8 NA 4J 95 94.5 170 <10 383.0 0.2J Background/Compliance Wells MW-7 Shallow 1/9/2008 Background 8.6 42.0 NA <5 <10 <10 287 <10 577 <1.0 4/1/2008 2nd Qtr./Compliance 8.6 44.6 NA <5 13 <10 273 <10 587 <1.0 7/10/2008 3rd Qtr./Compliance 11.8 38.6 NA <5 10 <10 1,000 10 612 <1.0 10/22/2008 4th Qtr./Compliance 1.9 66.7 NA <5 18 <10 <100 10 688J <1.0 1/9/2009 1st Qtr. 7.5 26.0 NA <5 53 <10 <100 10 681 <1.0 4/8/2009 2nd Qtr. 6.1 27 J NA <5 14 20 479 <10 519 1.0 J 7/15/2009 3rd Qtr. NA 34.4 NA <5 <10 <10 663 20 587 1.4 10/12/2009 4th Qtr. NA 41.7 NA 3 14 <10 496 10 616 1.7 2/2/2010 1st Qtr. NA 44.1 NA 2 14 <10 522 10 608 0.5 4/13/2010 2nd Qtr. NA 45.5 NA 2 7 <10 270 10 561 0.7U 7/8/2010 3rd Qtr. NA 48.1 NA 3J 13 <10 466 20 551 0.7J 10/13/2010 4th Qtr. NA 41.9 NA 4J 13 <10 486 91 603 0.7J 1/21/2011 1st Qtr. NA 43.0 NA 4J 91 3.03 436 10 642 <1.0 4/14/2011 2nd Qtr. NA 42.7 NA 3J 13 3.77 240 <10 648 0AJ 7/20/2011 3rd Qtr. NA 44.4 NA 3J 8J <10 558 <10 647 16.0 10/13/2011 4th Qtr. NA 42.7 NA 2J <10 0.88 339 20 696 0.3J 1/24/2012 1st Qtr. NA 41.5 NA 3J 6J 5.24 288 <10 595 0.91 4/25/2012 2nd Qtr. NA 43.0 NA 4J 8J 5.35 199 <10 620 1.0 MW-201 Shallow 2/4/2008 Background 14.3 49.4 NA <5 17 <10 390 <10 786 <1.0 4/2/2008 2nd Qtr./Compliance 12.5 47.0 NA <5 28 <10 307 <10 807 <1.0 5/20/2008 Supplemental 11.4 51.1 NA <5 <10 <10 493J <10 877J 3.8 5/20/2008 2nd Qtr./Supplemental(Dup) 11.1 49.9 NA <5 <10 <10 503 <10 8501 <1.0 7/11/2008 3rd Qtr./Compliance 12.4 51.5 NA <5 13 <10 1,220 <10 956 <1.0 7/11/2008 3rd Qtr. 11.4 50.5 NA <5 13 <10 1,340 <10 893 <1.0 10/22/2008 4th Qtr./Compliance 6.3 44.7 NA <5 22 <10 <100 <10 832J 1.01 1/9/2009 1st Qtr. 10.8 58.1 NA <5 63 <10 <100 <10 841 1.5 4/8/2009 2nd Qtr. 12.0 53.2 NA <5 19 10 637 <10 879 1.3 J 7/15/2009 3rd Qtr. NA 50.9 NA <5 21 <10 1,000 <10 851 1.2 10/14/2009 4th Qtr. NA 52.0 NA 1 7 <10 688 20 907 2.4 2/2/2010 1st Qtr. NA 48.5 NA 2 31 <10 814 <10 899 0.6 4/14/2010 2nd Qtr. NA 49.4 NA 2 11 <10 515 10 950 0.61.1 7/8/2010 3rd Qtr. NA 52.9 NA 3J 32 10 849 <10 871 1.6 10/13/2010 4th Qtr. NA 48.7 NA 2J 15 <10 926 10 886 1.3 (Page 14 of 19)