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TABLE 5 LABORATORY ANALYTICAL RESULTS 2013 SEMIANNUAL GROUNDWATER MONITORING REPORT FORMER MARLEY COOLING TOWER SITE STOCKTON,CALIFORNIA Page 24 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 Field Blank 1/9/2008 Baseline <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 <1 <1 NA <5 <10 <10 <50 <10 12 <1.0 1/21/2008 Baseline <1 2.9 NA <5 <10 <10 <50 <10 <10 <1.0 2/4/2008 Background <1 4.5 NA <5 <10 <10 <50 <10 <10 <1.0 3/19/2008 Baseline <1 4.6 NA <5 <10 <10 <50 <10 12 <1.0 4/1/2008 Baseline/2nd Qtr <1 1.0 NA <5 <10 <10 <50 <10 <10 <1.0 4/2/2008 Baseline/2nd Qtr <1 1.3 NA <5 <10 <10 <50 <10 <10 <1.0 5/20/2008 Supplemental <1 5.3 NA <5 <10 <10 <50 <10 18 <1.0 7/10/2008 3rd Qtr. <1 <1 NA <5 <10 <10 <50 <10 25 <1.0 7/11/2008 3rd Qtr. 0.9 5.6 NA <5 <10 <10 <50 <10 18 <1.0 10/21/2008 4th Qtr. <1 <1 NA <5 <10 <10 <100 <10 24 7.1 10/22/2008 4th Qtr. <1 5.6 NA <5 <10 <10 <100 <10 <10UJ <1.0 1/8/2009 1st Qtr. <1 6.0 NA <5 <10 <10 <100 <10 25 <1.0 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 28 1.8 4/8/2009 2nd Qtr. <1 <1 NA <5 <10 <10 <50 <10 <10 1.5 7/14/2009 3rd Qtr. NA <1 NA <5 <10 <10 <50 <10 13 1.7 7/15/2009 3rd Qtr. NA 1.1 NA <5 <10 <10 <50 <10 12 3.2 10/14/2009 4th Qtr. NA 5.8 NA 2 5 <10 759 20 16 1.6 2/2/2010 1 st Qtr. NA <1 NA <5 <10 <10 <50 <10 14 0.3 2/3/2010 1 st Qtr. NA 3.5 NA <5 <10 <10 <50 <10 8 0.3 2/1/2010 1st Qtr. NA 2.2 NA <5 <10 <10 <50 <10 <10 0.3 4/13/2010 2nd Qtr. NA <1 NA <5 <10 <10UJ <50 <10 42 0.4 4/14/2010 2nd Qtr. NA <1 NA <5 <10 <10 <50 <10 8 0.2 4/15/2010 2nd Qtr. NA <1 NA <5 <10 <10 <50 <10 27J 0.2 7/7/2010 3rd Qtr. NA <1 NA <5 <10 <10 <50 <10 <10 0.51 7/8/2010 3rd Qtr. NA <1 NA <5 <10 <10 <50 <10 <10 0.2J 8/16/2010 3rd Qtr. NA 5.62 NA <5 <10 <10 <50 NA <10 <1.0 8/23/2010 3rd Qtr. NA 1.10 NA <5 <10 <10 <50 NA 29 0.7J 10/12/2010 4th Qtr. NA 1.3 NA <5 <10 <10 <50 <10 21 0.51 10/13/2010 4th Qtr. NA 6.3 NA <5 <10 <10 <50 <10 15 0.8J 10/14/2010 4th Qtr. NA 1.2 NA <5 <10 <10 <50 <10 <10 0.2J 12/6/2010 4th Qtr. NA <1 NA <5 <10 <10 <50 <10 <10 0.3J 12/8/2010 4th Qtr. NA <1 NA <5 <10 <10 <50 <10 <10 0.4J 1/20/2011 1st Qtr. NA 2.9J NA <5 <10 0.2UJ <50 <10 7.OJ 0.08J 1/21/2011 1st Qtr. NA 0.3J NA <5 <10 0.2UJ <50 <10 <10 0.1J 1/25/2011 1st Qtr. NA 1.8 NA <5 <10 <0.2 <50 <10 <10 0.2J 4/13/2011 2nd Qtr. NA <1 NA <5 <10 <0.2 <50 <10 <10 <1.0 4/14/2011 2nd Qtr. NA <1 NA <5 <10 <0.2 <50 <10 <10 <1.0 4/18/2011 2nd Qtr. NA 1.6 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 0.51 7/19/2011 3rd Qtr. NA OAJ NA <5 <10 <10 <50 <10 <5 0.3J 7/20/2011 3rd Qtr. NA 1.2 NA <5 <10 <10 <50 <10 7.OJ 0.91 7/21/2011 3rd Qtr. NA 0.3J NA <5 <10 <10 <50 <10 <10 0.1J 8/22/2011 Supplemental NA NA NA NA <10 <0.2 <50 <10 <10 0.91 10/12/2011 4th Qtr. NA <1 NA <5 <10 <0.5 <50 <10 <10 0.2J 10/13/2011 4th Qtr. NA <1 NA <5 <10 <0.5 <50 <10 <10 0.7J 10/17/2011 4th Qtr. NA <1 NA <5 <10 <0.5 <50 <10 <10 0.2J 1/24/2012 1st Qtr. NA <1 NA <5 <10 <0.5 <50 <10 <10 0.7J 1/25/2012 1st Qtr. NA <1 NA <5 <10 <0.5 <50 <10 <10 0.3J 1/26/2012 1st Qtr. NA <1 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 0.51 4/25/2012 2nd Qtr. NA <1 NA <5 <10 <0.5 <50 <10 8J 0.8J 4/26/2012 2nd Qtr. NA 0.8J NA <5 <10 <0.5 <50 <10 <10 1.1 4/30/2012 2nd Qtr. NA <1 NA <5 <10 <0.5 <50 <10 8J 0.91 5/2/2012 2nd Qtr. NA <1 NA <5 <10 <0.5 <50 <10 7J 0.1J