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TABLE 5 LABORATORY ANALYTICAL RESULTS 2013 SEMIANNUAL GROUNDWATER MONITORING REPORT FORMER MARLEY COOLING TOWER SITE STOCKTON,CALIFORNIA Page 13 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-214(1-8) Intermediate 7/10/2008 3rd Qtr. 5.6 26.3 NA 6 680 680 350 <10 370 <1.0 10/22/2008 4th Qtr. 5.5 30.3 NA 6 665 700 <100 <10 370J 1.2J 1/12/2009 1st Qtr. 5.3 26.4 NA 7 758 720 <100 <10 367 <1.0 4/8/2009 2nd Qtr. 5.5 26.4 NA 6 734 350 248 <10 312 10.0 7/15/2009 3rd Qtr. NA 25.8 NA 6 751 750 328 <10 367 1.0 10/15/2009 4th Qtr. NA 25.2 NA 6 700 770 206 <10 378 1.0 10/15/2009 4th Qtr.(Dup) NA 24.9 NA 6 720 750 227 <10 378 1.1 2/3/2010 1 st Qtr. NA 28.0 NA 5 718 690 299 <10 422 0.5 4/15/2010 2nd Qtr. NA 26.0 NA 6 716 670 212 <10 373 0AU 7/8/2010 3rd Qtr. NA 27.4 NA 5 662 610 272 <10 363 0.3J 10/14/2010 4th Qtr. NA 10.3 NA 3J 11 <10 634 4,970 423 28 10/14/2010 4th Qtr.(Dup) NA 10.8 NA 4J 91 <10 426 4,800 360 29 1/21/2011 1st Qtr. NA 38.9 NA 5 3J <0.2 204 2,450 478 1.01 4/13/2011 2nd Qtr. NA 40.1 NA 3J 3J <0.2 230 2,880 421 4.1 7/19/2011 3rd Qtr. NA 70.9 NA 1J <10 <10 167 2,490 383 <1.0 10/12/2011 4th Qtr. NA 69.4 NA 4J <10 <0.5 213 1,780 371 0.81 1/24/2012 1st Qtr. NA 53.8 NA 4J 4J <0.5 155 1,360 408 1.0 4/24/2012 2nd Qtr. NA 55.7 NA 3J <10 <0.5 177 1,260 418 1.3 7/23/2012 3rd Qtr NA 72.0 NA 5 4J <0.5 207 1,790 535 0.5J 7/23/2012 3rd Qtr(Dup) NA 71.2 NA 5 3J <0.5 200 1,690 490 0.6J 10/23/2012 4th Qtr NA 69.0 NA 6 <10 <0.5 236 1,760 518 1.9 1/24/2013 1st Qtr. NA 69.4 NA 6 <10 <0.5 639 2,020 508 0.5J MW-320 Intermediate 5/20/2008 Supplemental 4.3 26.7 NA 6 33 40 144 <10 371J 1.2 4/14/2011 2nd Qtr. NA 13.1 NA 10 7J 3.96 65 <10 230 0.11 7/20/2011 3rd Qtr. NA 12.2 NA 8 5J <10 129 <10 220 <1.0 10/12/2011 4th Qtr. NA 12.9 NA 8 3J 2.60 75 5J 287 2.9 10/12/2011 4th Qtr.(Dup) NA 12.9 NA 7 3J 2.59 76 6J 248 2.9 1/25/2012 1st Qtr. NA 13.2 NA 3J 5J 4.08 376 2,880 203 0.91 4/24/2012 2nd Qtr. NA 13.3 NA 10 11 10.90 92 <10 233 0.7J 4/24/2012 2nd Qtr.(Dup) NA 13.4 NA 10 11 10.90 88 <10 240 .6J 7/23/2012 3rd Qtr NA 8.1 NA 6 <10 <0.5 239 260 190 4.4 10/22/2012 4th Qtr NA 15.0 NA 7 <10 <0.5 120 90 229 3.8 1/24/2013 1st Qtr. NA 21.3 NA 6 41 41.00 140 10 379 0AJ 4/11/2013 2nd Qtr. NA 21.3 NA 6 49 49.10 142 <10 373 0.51 MW-321 (1-9) Intermediate 4/2/2008 Baseline/2nd Qtr 9.7 23.7 NA 8 380 380 260 <10 453 <1.0 5/20/2008 Supplemental 9.0 28.5 54.6 8 372J 380J 240J <10 470J 5.2 5/20/2008 Supplemental(Dup) 5.0 26.3 NA 7 482 480 188 <10 392J <1.0 7/11/2008 3rd Qtr. 11.0 28.7J NA 8 730 700 535 <10 470 <1.0 7/11/2008 3rd Qtr.(Dup) 9.0 31.1 NA 8 728 700 556 <10 478 <1.0 10/22/2008 4th Qtr. 8.6 30.2 NA 8 860 900 <100 <10 450 1.2 11/13/2008 Supplemental 8.7 29.3 NA 8 818 800 <100 <10 453J <1J 1/12/2009 1st Qtr. 9.7 27.2 NA 8 789 740 <100 <10 467 <1.0 4/8/2009 2nd Qtr. 8.6 26.5 NA 9 604 580 354 <10 436 <1.0 UJ 7/15/2009 3rd Qtr. NA 26.0 NA 8 492 490 518 <10 458 <1.0 10/15/2009 4th Qtr. NA 23.7 NA 9 340 390 298 <10 464 1.2 2/3/2010 1 st Qtr. NA 24.1 NA 7 418 370 440 <10 460 0.4 4/15/2010 2nd Qtr. NA 23.6 NA 8 430 360 343 <10 441 0AU 7/8/2010 3rd Qtr. NA 25.6 NA 8 598 520 368 <10 455 0.3J 10/14/2010 4th Qtr. NA 26.2 NA 8 760 620 457 <10 498 0.8J 12/6/2010 4th Qtr. NA 23.8 NA 10 474 447 214 40 495 7.2 1/25/2011 1st Qtr. NA 25.4 NA 8 536 517 224 130 520 4.8 4/18/2011 2nd Qtr. NA 25.3 NA 8 406 353 112 450 471 11 5/23/2011 Supplemental NA NA NA NA 140 140 314 570 NA 6.4 6/20/2011 Supplemental NA NA NA NA 142 150 155 480 NA 5.6 7/21/2011 3rd Qtr. NA 23.9 NA 8 149 150 295 790 448 14.0 7/21/2011 3rd Qtr.(Dup) NA 23.2 NA 8 154 150 294 790 430 13.0 8/22/2011 Supplemental NA NA NA NA 136 130 125 640 NA 6.6 10/13/2011 4th Qtr. NA 26.1 NA 6 158 158 239 810 488 5.3 1/26/2012 1 st Qtr. NA 21.3 NA 7 120 116 182 610 414 5.4 4/30/2012 2nd Qtr. NA 23.5 NA 10 4J 0.43J 160 920 429 3.9 7/19/2012 3rd Qtr NA 10.5 NA 8 150 149 258 510 646 1.8 10/25/2012 4th Qtr NA 24.3 NA 9 57 49.5 295 730 476 12.0 10/25/2012 4th Qtr(Dup) NA 24.8 NA 9 58 51.6 312 710 469 10.0 1/29/2013 1st Qtr. NA 28.4 NA 8 <10 <0.5 356 2,190 530 1.9 1/29/2013 1st Qtr.(Dup) NA 28.5 NA 8 <10 <0.5 306 2,200 543 2.1 4/10/2013 2nd Qtr. NA 28.7 NA 8 10 7.16 213 1,040 527 0.8J 4/10/2013 2nd Qtr.(Dup) NA 28.5 NA 8 10 7.15 230 1,050 554 0.7J