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TABLE 5 LABORATORY ANALYTICAL RESULTS 2013 SEMIANNUAL GROUNDWATER MONITORING REPORT FORMER MARLEY COOLING TOWER SITE STOCKTON,CALIFORNIA Page 11 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 In'ection Area Wells Continued TW-16 100-Ft.Sand 1/21/2011 1st Qtr. NA 152 NA <5 7J <0.2 534 1,540 896 <1.0 (Continued) 4/14/2011 2nd Qtr. NA 422 NA <5 7J <0.2 687 1,840 1,210 0.5J 7/20/2011 3rd Qtr. NA 341 NA <5 4J <10 956 1,860 1,090 1.11 10/13/2011 4th Qtr. NA 149 NA <5 <10 <0.5 369 1,360 779 0AJ 1/24/2012 1st Qtr. NA 164 NA <5 <10 <0.5 415 1,930 762 1.0 1/24/2012 1st Qtr.(Dup) NA 164 NA <5 <10 <0.5 466 1,930 768 1.0 4/25/2012 2nd Qtr. NA 149 NA <5 4J <0.5 478 3,250 866 1.1 7/18/2012 3rd Qtr NA 147 NA <5 3J <0.5 557 3,200 991 0.6J 10/23/2012 4th Qtr NA 182 NA <5 4J <0.5 559 3,410 961 1.9 1/25/2013 1st Qtr. NA 146 NA <5 <10 <0.5 602 3,290 886 0.6J 1/25/2013 1st Qtr.(Dup) NA 145 NA <5 <10 <0.5 639 3,400 867 0.7J 4/10/2013 2nd Qtr. NA 212 NA <5 <10 <0.5 407 3,390 902 0.7J I-11 Intermediate 5/20/2008 Supplemental 5.0 26J 43.9 8 481 470 179 <10 380J 1.0 7/11/2008 3rd Qtr. 5.9 24.2J NA 8 200 200 375 <10 397 <1.0 10/22/2008 4th Qtr. 5.2 27.1 J NA 9 110 100 <100 40 383J 1.3J 1/12/2009 1st Qtr. 6.2 25.7 NA 9 112 100 <100 40 410 <1.0 4/8/2009 2nd Qtr. 6.3 25.7 NA 8 90 100 283 30 423 1.1 J 7/15/2009 3rd Qtr. NA 26.0 NA 8 74 100 443 10 436 1.3 10/15/2009 4th Qtr. NA 23.8 NA 8 76 90 295 7 445 1.5 2/2/2010 1 st Qtr. NA 24.6 NA 7 68 80 422 5 467 0.5 4/15/2010 2nd Qtr. NA 24.7 NA 8 72 70 325 <10 431 0.3U 7/8/2010 3rd Qtr. NA 27.2 NA 8 67 60 363 <10 492 0.6J 10/14/2010 4th Qtr. NA 26.2 NA 7 60 60 414 <10 449 0.81 12/6/2010 4th Qtr. NA 25.5 NA 8 55 54.3 293 <10 605 0.51 1/25/2011 1st Qtr. NA 23.8 NA 6 56 56.3 170 <10 513 <1.0 4/14/2011 2nd Qtr. NA 25.6 NA 7 80 79.8 258 <10 424 0.07J 5/23/2011 Supplemental NA NA NA NA 126 120 227 <10 NA <1.0 6/20/2011 Supplemental NA NA NA NA 184 180 170 <10 NA <1.0 7/21/2011 3rd Qtr. NA 24.9 NA 6.0 196 190 276 <10 416.0 <1.0 8/22/2011 Supplemental NA NA NA NA 367 343 84 <10 NA 0.6J 10/17/2011 4th Qtr. NA 23.5 NA 7.0 368 367 217 <10 483 0.2J 10/17/2011 4th Qtr.(Dup) NA 24.6 NA 7.0 370 369 208 <10 453 0.3J 1/26/2012 1st Qtr. NA 27.0 NA 7.0 450 441 207 <10 424 0.51 1/26/2012 1st Qtr.(Dup) NA 27.0 NA 7.0 463 440 221 <10 412 0.51 4/30/2012 2nd Qtr. NA 26.0 NA 9.0 510 507 170 <10 439 1.1 4/30/2012 2nd Qtr.(Dup) NA 25.8 NA 9.0 511 508 180 <10 430 1.0 7/18/2012 3rd Qtr NA 2.6 NA 7.0 440 438 206 <10 516 0.3J 10/25/2012 4th Qtr NA 26.2 NA 9.0 305 303 285 <10 461 0.51 1/29/2013 1st Qtr. NA 27.5 NA 7.0 360 346 296 100 450 3.3 4/12/2013 2nd Qtr. NA 30.8 NA 7.0 100 82 207 200 471 3.6 MW-1 Intermediate 1/21/2008 Baseline 4.7 40.5 NA <5 <10 <10 360 30 460 <1.0 4/1/2008 2nd Qtr. 5.4 43.9 NA <5 10 <10 216 10 452 <1.0 7/10/2008 3rd Qtr. 5.8 43.3 NA <5 <10 <10 530 <10 466 <1.0 10/21/2008 4th Qtr. 5.3 42.8 NA <5 <10 <10 <100 <10 484 1.5 1/8/2009 1st Qtr. 5.9 45.1 NA 5 17 <10 <100 <10 487 <1.0 4/7/2009 2nd Qtr. 6.3 43.6 NA <5 <10 <10 319 20 497 <1.0 7/14/2009 3rd Qtr. NA 44.4 NA <5 <10 <10 384 <10 474 1.1 10/12/2009 4th Qtr. NA 42.4 NA 2 14 <10 390 30 523 1.7 10/12/2009 4th Qtr.(Dup) NA 42.2 NA 3 6 <10 408 20 531 1.6 2/1/2010 1st Qtr. NA 45.4 NA 3 18 <10 387 7 479 0AU 4/13/2010 2nd Qtr. NA 44.3 NA 4 14 101 230 <10 521 0.6U 7/7/2010 3rd Qtr. NA 45.3 NA 3J 11 <10 389 6J 560 0AJ 10/12/2010 4th Qtr. NA 45.5 NA 3J 11 <10 308 6J 491 0.91 1/20/2011 1st Qtr. NA 44.5 NA 3J <10 0.64 290 10 556 <1.0 4/13/2011 2nd Qtr. NA 45.4 NA 4J 6J 3.00 279 <10 526 0.91 7/19/2011 3rd Qtr. NA 45.0 NA 3J 5J <10 223 6J 484 <1.0 10/12/2011 4th Qtr. NA 44.9 NA 3J 3J 2.50 293 7J 555 0.3J 1/25/2012 1st Qtr. NA 44.1 NA 3J 4J 2.71 213 7J 502 0.8J 4/24/2012 2nd Qtr. NA 43.3 NA 4J 3J 1.42 230 10 500 1.1 7/24/2012 3rd Qtr NA 47.4 NA 3J 5J 2.29 229 91 508 0.6J 10/23/2012 4th Qtr NA NA NA 4J 6 NA NA NA NA NA 1/25/2013 1st Qtr. NA NA NA NA <10 NA NA NA NA NA