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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 * Sulfate (mg/L Calcium (mg/L Arsenic /L /L Iron /L /L TDS m/L Water Quality Objective 10 250 10 50 50** 300 50 450 Background/Compliance Wells MW-201(Continued) 2/2/2010 1st Qtr. NA 48.5 2.0 31 <10 814 <10 899 4/14/2010 2nd Qtr. NA 49.4 2.0 11 <10 515 10 950 7/8/2010 3rd Qtr. NA 52.9 3.0 32 10 849 <10 871 10/13/2010 4th Qtr. NA 48.7 2.OJ 15 <10 926 10 886 1/21/2011 1st Qtr. NA 52.2 NA 4J 21 8.98 736 <10 920 4/14/2011 2nd Qtr. NA 54.1 NA 3J 23 10 326 <10 944 7/21/2011 3rd Qtr. NA 54.1 NA 2J 10 <10 656 <10 1430 10/13/2011 4th Qtr. NA 53.9 NA 2J 13 10 528 <10 940 1/25/2012 1st Qtr. NA 44.6 NA 5.0 17 9 127 <10 975 4/30/2012 2nd Qtr. NA 48.8 NA 3J 14 10.7 357 <10 835 MW-202 6/28/1985 1985-1987 Common Ion 35 16 -- -- -- 580 7/22/1985 1985-1987 Common Ion 66 18 80 550 7/30/1985 1985-1987 Common Ion 26 20 -- 520 11/11/1986 Hist.Sum.GW Quality -- -- 12 -- 1/30/1987 1985-1987 Common Ion 42.1 27 19 605 4/23/1987 Hist.Sum.GW Quality -- -- 20 -- 10/22/1987 Hist.Sum.GW Quality 10 1/14/1988 Hist.Sum.GW Quality 10 7/14/1988 Hist.Sum.GW Quality 10 9/27/1988 Hist.Sum.GW Quality 10 12/14/1988 Hist.Sum.GW Quality 3 4/18/1989 Hist.Sum.GW Quality 2 1/15/1990 Hist.Sum.GW Quality 10 4/24/1990 Hist.Sum.GW Quality 25 1/1/2001 Hist.Sum.GW Quality 7 4/1/2007 Dudek 2007 Annual Rpt -- -- -- 7 -- -- -- 1/9/2008 Background 7.5 45.2 NA <5 <10 <10 227 <10 556 Historic Concentration Range 7.5-66 16-45.2 0 227 520-605 WDR/MRP Suggested Upper Limit Background Concentration 9. 58.8 afinnff13 �� 295.1612 Proposed Upper Limit Background Concentration 58.8 295.1 612 4/1/2008 2nd Qtr./Compliance 8.1 43.7 NA <5 15 <10 218 <10 563 7/10/2008 3rd Qtr./Compliance 9.2 37.9 NA <5 <10 <10 830 <10 636 10/21/2008 4th Qtr./Compliance 7.5 37.6 NA <5 15 <10 <100 <10 620 1/9/2009 1st Qtr./Compliance 8.3 39.8 NA <5 33 <10 <100 <10 573 4/7/2009 2nd Qtr./Compliance 7.3 36.7 NA <5 <10 <10 429 <10 541 7/14/2009 3rd Qtr./Compliance NA 37.0 <5 <10 <10 630 <10 612 10/12/2009 4th Qtr. NA 39.2 3.0 11 <10 604 <10 670 2/1/2010 1st Qtr. NA 38.6 2.0 31 <10 676 <10 798 4/14/2010 2nd Qtr. NA 40.0 3.0 26 <10 423 <10 737 7/7/2010 3rd Qtr. NA 30.5 3.0 8 <10 472 <10 587 10/13/2010 4th Qtr. NA 39.4 3.OJ 15 <10 493 <10 585 1/21/2011 1st Qtr. NA 40.6 NA 4J 12 3.36 360 <10 727 4/13/2011 2nd Qtr. NA 36.2 NA 3J 7J 2.67 233 <10 541 7/20/2011 3rd Qtr. NA 41.0 NA 3J 6J <10 454 <10 621 10/12/2011 4th Qtr. NA 41.7 NA 2J 3J 1.57 327 91 678 1/25/2012 1st Qtr. NA 45.8 NA 2J 5J 4.08 281 <10 585 4/24/2012 2nd Qtr. NA 47.8 NA 3J 10 4.46 281 <10 639 (Page 3 of 10)