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TABLE 5 LABORATORY ANALYTICAL RESULTS 2011 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 (pg/L) (pg/L) (pg/L)** Iron (pg/L) (pg/L) TDS (mg/L) TOC (mg/L) Water Quality Objective 10 250 -- 10 50 50 300 50 450 -- Injection Area Wells Continued 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 0.4U 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 0.4J 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 3.1 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 MW-2 Intermediate 2/4/2008 Baseline 6.4 38.0 NA 6 39 30 123 <10 345 <1.0 4/2/2008 2nd Qtr. 7.4 45.9 NA 5 42 40 117 <10 380 <1.0 7/11/2008 3rd Qtr. 8.5 53.1 NA 5 37 30 343 <10 386 <1.0 10/22/2008 4th Qtr. 2.6 49.6 NA <5 <10 <10 <100 20 298J <1.0 1/8/2009 1st Qtr. 6.5 53.8 NA 6 47 40 <100 <10 373 <1.0 4/7/2009 2nd Qtr. 5.6 51.4 NA <5 16 20 198 10 415 <1.0 7/15/2009 3rd Qtr. NA 47.1 NA 6 35 40 316 <10 371 1.2 10/15/2009 4th Qtr. NA 38.3 NA 2 4 <10 461 30 265 2.2 2/2/2010 1 st Qtr. NA 26.7 NA 2 4 <10 161 10 217 0.6 2/2/2010 1st Qtr. (Dup) NA 27.3 NA 2 4 <10 134 10 207 0.7 4/14/2010 2nd Qtr. NA 40.8 NA 5 35 40 186 <10 353 0.51_1 7/8/2010 3rd Qtr. NA 42.6 NA 2J 17 <10 414 30 262 0.6J 10/13/2010 4th Qtr. NA 210 NA 6 30 30 110 <10 349 0.7J 1/21/2011 1st Qtr. NA 35.4 NA 6 25 25.3 143 <10 346 <1.0 4/14/2011 2nd Qtr. NA 68.9 NA 6 17 15.1 590 <10 295 0.081 7/20/2011 3rd Qtr. NA 27.3 NA 5 16 10 193 <10 307 11.11 7/20/2011 3rd Qtr. (Dup) NA 26.9 NA 5 16 10 196 <10 306 1.01 10/13/2011 4th Qtr. NA 33.7 NA 5 19 19.4 137 <10 396 0.11 10/13/2011 4th Qtr. (Dup) NA 32.9 NA 5 19 19.5 134 <10 348 0.11 MW-213 (1-7) Intermediate 1/10/2008 Baseline 7.022J 39.8J NA 5 4,600 4,600 228 <10 476 <1.0 4/1/2008 2nd Qtr. 9.3 70.8 NA 5 7,220 7,200 297 <10 683 <1.0 5/20/2008 Supplemental 6.0 41.6 61.7 6 3,960 4,140 245 30 493J 16.0 7/11/2008 3rd Qtr. 6.7 41.5 NA 6 3,960 3,900 528 30 479 <1.0 10/22/2008 4th Qtr. 6.0 40.8 NA 7 3,860 3,640 <100 30 461J 1.7J 10/22/2008 4th Qtr. (Dup) 6.2 40.6 NA 7 3,830 3,700 <100 30 469J 1.4J 1/12/2009 1st Qtr. 6.2 38.9 NA 7 4,030 4,020 <100 30 458 <1.0 4/8/2009 2nd Qtr. 5.7 40.2 NA 7 3,840 3,190 322 20 433 11 7/15/2009 3rd Qtr. NA 34.9 NA 6 3,430 3,400 495 30 454 1.0 10/15/2009 4th Qtr. NA 34.9 NA 7 3,200 3,410 293 30 470 0.8 2/3/2010 1 st Qtr. NA 37.5 NA 5 3,480 2,960 442 30 492 0.4 4/15/2010 2nd Qtr. NA 36.1 NA 6 3,040 2,720 452 60 441 0AU 7/8/2010 3rd Qtr. NA 39.9 NA 6 2,900 2,740 392 70 469 0.3J 10/14/2010 4th Qtr. NA 50.0 NA 5 2,590 1,970 627 1,250 576 24.0 1/25/2011 1st Qtr. NA 37.1 NA 4J 5J <0.2 320 3,940 598 6.8 4/13/2011 2nd Qtr. NA 39.1 NA 3J 6J <0.2 309 3,000 495 0.91 7/20/2011 3rd Qtr. NA 50.0 NA 3J 125 110 345 2,550 555 3.7J 8/22/2011 Supplemental NA NA NA NA 1,390 1,320 134 2,200 NA 2.6 10/17/2011 4th Qtr. NA 44.2 NA 5 1,290 1,220 338 2,400 606 5.1 (Page 9 of 19)