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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-7 7/22/1985 1985-1987 Common Ion 13 18 -- -- -- -- 510 7/30/1985 1985-1987 Common Ion 13 19 -- -- -- -- 540 10/22/1985 Hist. Sum.GW Quality -- -- -- 20 -- -- -- 2/3/1986 Hist. Sum.GW Quality -- -- -- 21 -- -- -- 4/8/1986 Hist. Sum.GW Quality -- -- -- 22 -- -- -- 7/9/1986 Hist. Sum.GW Quality -- -- -- 14 -- -- -- 11/12/1986 Hist. Sum.GW Quality -- -- -- 14 -- -- -- 1/30/1987 Hist. Sum.GW Quality -- -- -- 15 -- -- -- 4/23/1987 Hist. Sum.GW Quality -- -- -- 20 -- -- -- 7/9/1987 Hist. Sum.GW Quality -- -- -- 10 -- -- -- 10/22/1987 Hist. Sum.GW Quality -- -- -- 20 -- -- -- 1/14/1988 Hist. Sum.GW Quality -- -- -- 10 -- -- -- 4/6/1988 Hist. Sum.GW Quality -- -- -- 20 -- -- -- 7/14/1988 Hist. Sum.GW Quality -- -- -- 20 -- -- -- 1/15/1990 Hist. Sum.GW Quality -- -- -- 10 -- -- -- 7/16/1990 Hist. Sum.GW Quality -- -- -- 11 -- -- -- 1/19/1995 Hist. Sum.GW Quality -- -- -- 10 -- -- -- 1/11/1996 Hist. Sum.GW Quality -- -- -- 10 -- -- -- 4/11/1996 Hist. Sum.GW Quality -- -- -- 10 -- -- -- 1/1/2001 Hist. Sum.GW Quality -- -- -- 6 -- -- -- 4/1/2006 Dudek 2007 Annual Rpt -- -- -- 11 -- -- -- 4/1/2007 Dudek 2007 Annual Rpt -- -- -- 8 -- -- -- 1/9/2008 Background 8.6 42.0 NA <5 <10 <10 287 <10 577 Historic Concentration Range 8.6-13 18-42 287 <10 510-577 WDR/MRP Suggested Upper Limit Background Concentratio 11.2 54.6 373 13 634.7 Proposed Upper Limit Background Concentration 11.2 54.6 373 634.7 4/1/2008 2nd Qtr./Compliance 8.6 44.6 NA <5 13 <10 273 <10 587 7/10/2008 3rd Qtr./Compliance 11.8 38.6 NA <5 10 <10 9w 1,000 V 10 612 10/22/2008 4th Qtr./Compliance 1.9 66.7 NA <5 18 <10 <100 10 688J 1/9/2009 1st Qtr./Compliance 7.5 26.0 NA <5 53 <10 <100 10 681 4/8/2009 2nd Qtr./Compliance 6.1 27.0 J NA <5 14 20 479 <10 519 7/15/2009 3rd Qtr./Compliance NA 34.4 <5 <10 <10 663 20 587 10/12/2009 4th Qtr. NA 41.7 3.0 14 <10 496 10 616 2/2/2010 1st Qtr. NA 44.1 2.0 14 <10 522 10 608 4/14/2010 2nd Qtr. NA 45.5 2.0 7.0 <10 270 10 561 7/8/2010 3rd Qtr. NA 48.1 3.0 13 <10 466 20 551 10/13/2010 4th Qtr. NA 41.9 4.OJ 13 <10 486 91 603 1/21/2011 1st Qtr. NA 43.0 NA 4J 91 3.03 436 10 642 4/14/2011 2nd Qtr. NA 42.7 NA 3J 13 3.77 240 <10 648 7/20/2011 3rd Qtr. NA 44.4 NA 3J 81 <10 558 <10 647 10/13/2011 4th Qtr. NA 42.7 NA 2J <10 0.88 339 20 696 (Page 1 of 9)