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TABLE 6 <br /> HISTORIC GROUNDWATER ANALYTICAL RESULTS AND PROPOSED COMPLIANCE WELL BACKGROUND CONCENTRATION LIMITS <br /> FULL SCALE IN SITU HEXAVALENT CHROMIUM REDUCTION TREATMENT <br /> FORMER MARLEY COOLING TOWER SITE <br /> STOCKTON,CALIFORNIA <br /> Laboratory Analyses <br /> Hexavalent <br /> Nitrate as N Chromium Chromium Manganese <br /> Well Sample Date Event/Purpose (m* Sulfate (mg/L Calcium (mg/L Arsenic Iron TDS m <br /> Water Quality Objective 10 250 10 50 50- 300 50 450 <br /> Rackground/Compliance Wells <br /> NIW-304 1/21/1987 1985-1987 Common Ion 61.6 74 -- -- -- -- -- 730 <br /> 1/29/1987 1985-1987 Common Ion 37.7 46 -- 735 <br /> 7/13/1988 Hist.Sum.GW Quality -- -- 10 -- <br /> 1/1/2001 Hist.Sum.GW Quality 7 <br /> 4/l/2006 Due 2007 Annual Rpt -- -- -- <br /> <5 <br /> 4/1/2007 Dudek 2007 Annual Rpt 10 <br /> 1/21/2008 Background NA NA NA NA NA NA NA NA NA <br /> Historic Concentration Range 37.7-61.6 730-735 <br /> WDR/MRP Suggested Upper Limit Background oncentration 10.0 <br /> Proposed Upper Limit Background Concentration AWL 808.5 <br /> 4/1/2008 2nd Qtr./Compliance NA NA NA NA NA NA NA NA <br /> 7/10/2008 3rd Qtr./Compliance NA NA NA NA NA -- NA NA NA <br /> 10/22/2008 4th Qtr./Compliance 2.2 31.6 NA <5 24 <100 <10 893J <br /> 1/9/2009 1st Qtr./Compliance NA NA NA NA NA NA NA NA NA <br /> 4/8/2009 2nd Qtr./Compliance NA NA NA NA NA NA NA NA NA <br /> 7/15/2009 3rd Qtr./Compliance NA 41.3 <5 20 <10 990 <10 864 <br /> 10/14/2009 4th Qtr. NA 43.1 3.0 14 <10 659 <10 904 <br /> 2/2/2010 1stQtr. NA 44.2 3.0 35 <10 726 <10 849 <br /> 4/14/2010 2nd Qtr. NA 41.8 3.0 8.0 <10 444 <10 823 <br /> 7/8/2010 3rd Qtr. NA 44.2 3.0 27 10 714 <10 848 <br /> 10/13/2010 4th Qtr. NA 41.7 5.0 20 <10 703 <10 843 <br /> 1/21/2011 1st Qtr. NA 39.6 NA 4J 27 8.06 313J 5UJ 848 <br /> 4/13/2011 2nd Qtr. NA 39.9 NA 3J 15 8.04 424 <10 856 <br /> 7/20/2011 3rd Qtr. NA 41.1 NA 3J 17 <10 569 <10 856 <br /> 10/12/2011 4th Qtr. NA 42.4 NA 2J 6J 3.13 418 <10 859 <br /> 1/25/2012 1st Qtr. NA 43.4 NA 3J 10 9.03 417 <10 849 <br /> 4/26/2012 2nd Qtr. NA 41.6 NA 4J 12 8.27 353 <10 828 <br /> 7/24/2012 3rd Qtr NA 41.8 NA 3J 16 8.32 383 <10 853 <br /> 10/24/2012 4th Qtr NA NA NA NA 11 NA NA NA NA <br /> 1/29/2013 1stQtr. NA NA NA NA 10 NA NA NA NA <br /> 4/11/2013 2nd Qtr. NA NA NA NA 11 NA NA NA NA <br /> Page 7 of 10 <br />