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TABLE 6 HISTORIC GROUNDWATER ANALYTICAL RESULTS AND PROPOSED COMPLIANCE WELL BACKGROUND CONCENTRATION LIMITS FULL SCALE IN SITU HEXAVALENT CHROMIUM REDUCTION TREATMENT FORMER MARLEY COOLING TOWER SITE STOCKTON, CALIFORNIA Laboratory Analyses Hexavalent Nitrate as N Chromium Chromium Manganese Well Sample Date Event/Purpose m L * Sulfate (mg/L Calcium (mg/L Arsenic(pg/L) (gg/L L Iron L /L TDS m L Water Quality Objective 10 250 -- 10 50 50** 300 50 450 Background/Compliance Wells MW-302 7/14/1988 Hist. Sum.GW Quality -- -- -- 10 -- -- -- -- 9/28/1988 Hist. Sum.GW Quality -- -- -- 4 -- -- -- -- 12/13/1988 Hist. Sum.GW Quality -- -- -- 10 -- -- -- -- 10/26/1989 Hist. Sum.GW Quality -- -- -- 43 -- -- -- -- 1/15/1990 Hist. Sum.GW Quality -- -- -- 157 -- -- -- -- 4/24/1990 Hist. Sum.GW Quality -- -- -- 41 -- -- -- -- 7/18/1990 Hist. Sum.GW Quality -- -- -- 56 -- -- -- -- 1/17/1996 Hist. Sum.GW Quality -- -- -- 480 -- -- -- -- 1/29/1997 Hist. Sum.GW Quality -- -- -- 110 -- -- -- -- 4/1/1998 Hist. Sum.GW Quality -- -- -- 20 -- -- -- -- 1/1/2001 Hist. Sum.GW Quality -- -- -- 5 -- -- -- -- 4/1/2006 Dudek 2007 Annual Rpt -- -- -- -- 7.6 -- -- -- -- 4/1/2007 Dudek 2007 Annual Rpt -- -- -- -- 3 -- -- -- -- 1/9/2008 Background 3.5 16.2 NA <5 <10 <10 167J <10 377 Historic Concentration Range v 167 <10 WDR/MRP Suggested Upper Limit Background Concentration 217 Proposed Upper Limit Background Concentration 01 4/1/2008 2nd Qtr./Compliance 3.4 23.2 NA <5 10 <10 140 <10 423 7/10/2008 3rd Qtr./Compliance 4.2 24.5 NA <5 <10 <10 492 <10 471 10/21/2008 4th Qtr./Compliance 4.5 18.7 NA <5 13 <10 <100 <10 436 1/9/2009 1st Qtr./Compliance 4.5 20.3 NA <5 37 <10 <100 <10 464 4/7/2009 2nd Qtr./Compliance 3.9 57.1 NA <5 <10 <10 340 <10 537 7/14/2009 3rd Qtr./Compliance NA 23.1 <5 <10 <10 386 <10 474 10/12/2009 4th Qtr. NA 24.8 4.0 9 <10 326 <10 455 2/1/2010 1st Qtr. NA 17.2 4.0 14 <10 290 <10 388 4/14/2010 2nd Qtr. NA 18.9 4.0 14 <10 134 <10 404 7/7/2010 3rd Qtr. NA 16.6 4.0 9 <10 371 <10 386 10/13/2010 4th Qtr. NA 16.7 4.OJ 10 <10 287 <10 388 1/21/2011 1st Qtr. NA 15.4 NA 5.0 6J 2.04 155 <10 426 4/14/2011 2nd Qtr. NA 14.6 NA 5.0 8J 1.59 129 <10 334 7/20/2011 3rd Qtr. NA 14.3 NA 4J 3J <10 232 30 322 10/12/2011 4th Qtr. NA 48.2 NA 3J 4J 2.11 227 <10 499 MW-304 1/21/1987 1985-1987 Common Ion 61.6 74 -- -- -- -- -- 730 1/29/1987 1985-1987 Common Ion 37.7 46 -- -- -- -- -- 735 7/13/1988 Hist. Sum.GW Quality -- -- -- 10 -- -- -- -- 1/1/2001 Hist. Sum.GW Quality -- -- -- 7 -- -- -- -- 4/1/2006 Dudek 2007 Annual Rpt -- -- -- -- <5 -- -- -- -- 4/1/2007 Dudek 2007 Annual Rpt -- -- -- -- 10 -- -- --1/21/2008 Background NA NA NA NA NA NA NA NA NA Historic Concentration Range 37.7-61.6 46-74 730-735 WDR/MRP Suggested Upper Limit Background Concentration 10.0 Proposed Upper Limit Background Concentration 10.0 _�60 300 808.5 4/1/2008 2nd Qtr./Compliance NA NA NA NA NA -- NA NA NA 7/10/2008 3rd Qtr./Compliance NA NA NA NA NA -- NA NA NA 10/22/2008 4th Qtr./Compliance 2.2 31.6 NA <5 24 -- <100 <10 893J 1/9/2009 1st Qtr./Compliance NA NA NA NA NA NA NA NA NA 4/8/2009 2nd Qtr./Compliance NA NA NA NA NA NA NA NA NA 7/15/2009 3rd Qtr./Compliance NA 41.3 <5 20 <10 990 <10 864 10/14/2009 4th Qtr. NA 43.1 3.0 14 <10 659 <10 904 2/2/2010 1st Qtr. NA 44.2 3.0 35 <10 726 <10 849 4/14/2010 2nd Qtr. NA 41.8 3.0 8.0 <10 444 <10 823 7/8/2010 3rd Qtr. NA 44.2 3.0 27 10 714 <10 848 10/13/2010 4th Qtr. NA 41.7 5.0 20 <10 703 <10 843 1/21/2011 1st Qtr. NA 39.6 NA 4J 27 8.06 313J 5UJ 848 (Page 6 of 9)