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TABLE 5 LABORATORY ANALYTICAL RESULTS 2013 SEMIANNUAL GROUNDWATER MONITORING REPORT FORMER MARLEY COOLING TOWER SITE STOCKTON,CALIFORNIA Page 23 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 Quality Control Samples Continued Equipment Rinsate(Continued) 1/8/2009 1st Qtr. <1 5.4 NA <5 <10 <10 <100 <10 708 1.5 1/9/2009 1st Qtr. <1 <1 NA <5 <10 <10 <100 <10 <10 <1.0 1/12/2009 1st Qtr. <1 <1 NA <5 <10 <10 <100 <10 <10 <1.0 4/7/2009 2nd Qtr. <1 <1 NA <5 <10 <10 <50 <10 20 <1.0 4/8/2009 2nd Qtr. <1 <1 NA <5 <10 <10 <50 <10 <10 <1.0 7/14/2009 3rd Qtr. NA <1 NA <5 <10 <10 <10 <10 10 1.7 7/15/2009 3rd Qtr. NA <1 NA 8 <10 <10 1,120 5,140 13 1.6 10/12/2009 4th Qtr. NA <1 NA <5 <10 <10 <50 <10 13 1.2 10/15/2009 4th Qtr. NA <1 NA <5 <10 <10 <50 <10 8 1.0 2/2/2010 1 st Qtr. NA 0.5 NA <5 <10 <10 <50 <10 14 0.2 2/3/2010 1 st Qtr. NA 0.5 NA <5 <10 <10 <50 <10 7 0.3 2/1/2010 1st Qtr. NA 2.4 NA <5 <10 <10 <50 <10 13 0.2 4/13/2010 2nd Qtr. NA <1 NA <5 <10 <10UJ <50 <10 22 0.4 4/14/2010 2nd Qtr. NA <1 NA <5 <10 <10 <50 <10 <10 0.2 4/15/2010 2nd Qtr. NA <1 NA <5 <10 <10 <50 <10 <10 0.5 7/7/2010 3rd Qtr. NA 0.45J NA <0.5 <10 <10 <50 <10 <10 0.51 7/8/2010 3rd Qtr. NA <1 NA <0.5 <10 <10 <50 <10 10 0.2J 8/16/2010 3rd Qtr. NA 4.91 NA <0.5 <10 <10 <50 NA 11 1.0 8/23/2010 3rd Qtr. NA 0.65J NA <0.5 <10 <10 <50 NA 23 1.1 10/12/2010 4th Qtr. NA 0.3J NA <5 <10 <10 <50 <10 16 0.91 10/13/2010 4th Qtr. NA 1.3 NA <5 <10 <10 <50 <10 7J 1.5 10/14/2010 4th Qtr. NA OAJ NA <5 <10 <10 <50 <10 <10 0.2J 12/6/2010 4th Qtr. NA OAJ NA <5 <10 <10 <50 <10 <10 0AJ 12/8/2010 4th Qtr.(2"Pump) NA <1 NA <5 <10 <10 <50 <10 <10 0.3J 12/8/2010 4th Qtr.(4"Pump) NA <1 NA <5 <10 <10 <50 <10 <10 0.51 1/20/2011 1st Qtr. NA 0.3J NA <5 <10 0.2UJ <50 <10 <10 0.07J 1/21/2011 1st Qtr. NA 1AJ NA <5 <10 0.2UJ <50 <10 6.OJ 0.3J 1/25/2011 1st Qtr. NA 0.3J NA <5 <10 <0.2 <50 <10 <10 0.2J 4/13/2011 2nd Qtr. NA <1 NA <5 <10 <0.2 <50 <10 5J 0.11 4/14/2011 2nd Qtr. NA <1 NA <5 <10 <0.2 <50 <10 5J <1.0 4/18/2011 2nd Qtr. NA <1 NA <5 <10 <0.2 <50 <10 <10 <1.0 5/23/2011 Supplemental NA NA NA NA <10 <0.2 <50 <10 NA <1.0 6/20/2011 Supplemental NA NA NA NA <10 <0.2 <50 <10 NA 0.8J 7/19/2011 3rd Qtr. NA 0.3J NA <5 <10 <10 <50 <10 <5 0.3J 7/20/2011 3rd Qtr. NA <1 NA <5 <10 <10 <50 <10 8.OJ 0.91 7/21/2011 3rd Qtr.(4") NA <1 NA <5 <10 <10 <50 <10 8.01 0.3J 7/21/2011 3rd Qtr.(2") NA 0.3J NA <5 <10 <10 <50 <10 <10 0.2J 8/22/2011 Supplemental NA NA NA NA <10 <0.2 <50 <10 <10 1.0 10/12/2011 4th Qtr. NA 0.8J NA <5 <10 <0.5 <50 <10 <10 0.11 10/13/2011 4th Qtr. NA 1.2 NA <5 <10 <0.5 <50 <10 <10 0.11 10/17/2011 4th Qtr. NA <1 NA <5 <10 <0.5 <50 <10 <10 0.2J 1/24/2012 1st Qtr. NA 0.3J NA <5 <10 <0.5 <50 <10 6.OJ 0.8J 1/25/2012 1st Qtr. NA 0.47J NA <5 <10 <0.5 <50 <10 5.01 0.2J 1/26/2012 1st Qtr. NA 0.29J NA <5 <10 <0.5 <50 <10 <10 0.3J 4/24/2012 2nd Qtr. NA <1 NA <5 <10 <0.5 <50 <10 <10 0.7J 4/25/2012 2nd Qtr. NA <1 NA <5 <10 <0.5 <50 <10 8J 1.0 4/26/2012 2nd Qtr. NA <1 NA <5 <10 <0.5 <50 <10 <10 0.91 4/30/2012 2nd Qtr. NA <1 NA <5 <10 <0.5 <50 <10 6J 0.91 5/2/2012 2nd Qtr. NA 1.1 NA <5 <10 <0.5 <50 <10 5J 0.2J 7/18/2012 3rd Qtr NA 0.3J NA <5 <10 <0.5 <50 <10 <10 0.2J 7/19/2012 3rd Qtr NA <1 NA <5 <10 <0.5 <50 <10 6.OJ 0.7J 7/23/2012 3rd Qtr NA 0.3J NA <5 <10 <0.5 <50 <10 5.01 0.51 7/24/2012 3rd Qtr NA 0.3J NA <5 <10 <0.5 <50 <10 5.01 0.5J 7/25/2012 3rd Qtr NA <1 NA <5 <10 <0.5 <50 <10 5.01 0.2J 10/22/2012 4th Qtr NA 5.6 NA <5 <10 <0.5 <50 <10 23.0 1.3 10/23/2012 4th Qtr NA <1 NA <5 <10 <0.5 <50 <10 <10 0.11 10/24/2012 4th Qtr NA <1 NA <5 <10 <0.5 <50 <10 5.01 OAJ 10/25/2012 4th Qtr NA <1 NA <5 <10 <0.5 <50 <10 <10 0.7J 10/29/2012 4th Qtr NA <1 NA <5 <10 <0.5 <50 <10 <10 0.51 1/25/2013 1st Qtr. NA <1 NA <5 <10 <0.5 <50 <10 <10 0AJ 1/29/2013 1st Qtr. NA <1 NA <5 <10 <0.5 <50 <10 <10 0.51 1/30/2013 1st Qtr. NA <1 NA <5 <10 0.34J <50 <10 <10 0.091 4/10/2013 2nd Qtr. NA <1 NA <5 <10 <0.5 <50 <10 <10 0.3J 4/11/2013 2nd Qtr. NA <1 NA <5 <10 <0.5 <50 <10 <10 0.3J 4/12/2013 2nd Qtr. NA <1 NA <5 <10 <0.5 <50 <10 <10 0.3J 4/16/2013 2nd Qtr. NA <1 NA <5 <10 <0.5 <50 <10 <10 <1.0