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TABLE 5 LABORATORY ANALYTICAL RESULTS 2013 SEMIANNUAL GROUNDWATER MONITORING REPORT FORMER MARLEY COOLING TOWER SITE STOCKTON,CALIFORNIA Page 22 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 Background/Compliance Wells Continued MW-325 Intermediate 1/21/2008 Background 5.0 17.3 NA 9 <10 <10 157 <10 330 <1.0 4/1/2008 2nd Qtr./Compliance 5.2 15.4 NA 9 <10 <10 140 <10 360 <1.0 7/10/2008 3rd Qtr./Compliance 5.5 16.3 NA 10 <10 <10 382 <10 394 <1.0 10/21/2008 4th Qtr./Compliance 12.7 31.4 NA 5 31 <10 <100 <10 638 3.1 1/12/2009 1st Qtr. 6.5 17.0 NA 10 15 <10 <100 <10 382 <1.0 4/7/2009 2nd Qtr. 6.4 17.8 NA 10 <10 <10 264 <10 403 <1.0 7/14/2009 3rd Qtr. NA 29.0 NA <5 <10 <10 528 <10 646 1.1 10/12/2009 4th Qtr. NA 28.1 NA 5 20 <10 498 <10 660 1.3 2/1/2010 1st Qtr. NA 30.0 NA 5 26 <10 623 <10 636 0AU 4/13/2010 2nd Qtr. NA 22.4 NA 6 14 <10 319 <10 514 0.6 7/7/2010 3rd Qtr. NA 21.6 NA 6 12 <10 359 <10 492 0.3J 10/12/2010 4th Qtr. NA 23.9 NA 5 14 <10 350 <10 503 0.8J 1/20/2011 1st Qtr. NA 30.3 NA 5 12 6.13 476 <10 636 0.3J 4/13/2011 2nd Qtr. NA 15.9 NA 8 8J 3.55 240 <10 395 1.1 7/19/2011 3rd Qtr. NA 5.6 NA 19 <10 <10 42J 70 162 <1.0 10/12/2011 4th Qtr. NA 13.6 NA 4J <10 <0.5 171 20 315 1.5 1/24/2012 1st Qtr. NA 30.1 NA 4J 8J 7.00 272 <10 605 0.91 4/24/2012 2nd Qtr. NA 30.1 NA 5 8J 7.82 307 <10 610 0.8J 7/24/2012 3rd Qtr NA 24.5 NA 5 91 5.57 229 5J 518 0.6J 10/23/2012 4th Qtr NA NA NA NA 8J NA NA NA NA NA 1/25/2013 1st Qtr. NA NA NA NA 8J NA NA NA NA NA 4/10/2013 2nd Qtr. NA NA NA NA 8J NA NA NA NA NA Quality Control Samples Equipment Rinsate 1/9/2008 Basline <1 <1 NA <5 <10 <10 <50 <10 <10 <1.0 1/10/2008 Baseline <1 <1 NA <5 <10 <10 <50 <10 <10 <1.0 1/14/2008 Baseline 0.3 1.3 NA <5 <10 <10 <50 <10 18 <1.0 1/21/2008 Background <1 4.8 NA <5 <10 <10 <50 <10 <10 <1.0 2/4/2008 Background <1 3.4 NA <5 <10 <10 <50 <10 <10 <1.0 3/19/2008 Baseline <1 3.7 NA <5 <10 <10 <50 <10 25 <1.0 4/1/2008 Baseline/2nd Qtr <1 <1 NA <5 <10 <10 <50 <10 <10 <1.0 4/2/2008 Baseline/2nd Qtr <1 <1 NA <5 <10 <10 <50 <10 <10 <1.0 5/20/2008 Supplemental 0.4 6.3 NA <5 <10 <10 <50 <10 18 <1.0 7/10/2008 3rd Qtr. <1 <1 NA <5 <10 <10 <50 <10 45 <1.0 7/11/2008 3rd Qtr. <1 6.6 NA <5 <10 <10 <50 <10 33 <1.0 10/21/2008 4th Qtr. <1 <1 NA <5 <10 <10 <100 <10 <10 7.0 10/22/2008 4th Qtr. <1 5.3 NA <5 <10 <10 <100 <10 54J 1.0