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100,000 Total and Hexavalent Chromium 100,000 Iron and Manganese 1,000 Arsenic 10,000 Total Chromium 1 000 — — — WQO for Arsenic(10 Ng/L) � J Hexavalent Chromium Z 1,000 - - - WQO for Chromium(50 Ng/L) 100 - c 1,000 100 - - - - - - - - - - - 100 v - - - - - - - 10 c 10 Is R r = f Iron d U 1 v 10 == Manganese c 0 - WQO for Iron(300 ug/L) U - - WQO for Manganese(50 Ng/L) 0.1 1 ' 1 Jan.2008 Jan.2009 Jan.2010 Jan.2011 Jan.2012 Jan.2008 Jan. 2009 Jan.2010 Jan.2011 Jan.2012 Jan.2008 Jan.2009 Jan.2010 Jan.2011 Jan.2012 1,000 Sulfate 10,000 Total Organic Carbon 10,000 Total Dissolved Solids and Electrical Conductivity - - - - - - - - - - - - - - - - - - - - - - - - - 1,000 100 1,000 a� :100 Eas N - - - - - - - - - - - - - - - - - - - - c E :L 0 O U 10 w 10 100 0 E o ` r_ U v 1 Cn 0 TDS - - F_ EC WQO Sulfate(250 mg/L) - WQO for TDS(450 mg/L) 1 T - 0 10 Jan.2008 Jan.2009 Jan.2010 Jan.2011 Jan.2012 Jan. 2008 Jan.2009 Jan.2010 Jan.2011 Jan.2012 Jan.2008 Jan.2009 Jan.2010 Jan.2011 Jan.2012 12 pH 600 Oxidation-Reduction Potential Notes 500 The first sample point on the graphs represents baseline conditions before remedial 11 activities affected groundwater in the vicinity of the well 400 Non-detect values are plotted as half of the reporting limit 104 300 Metals samples were filtered before analysis; concentrations are on a dissolved basis w 0Blue shading represents periods of treatment through vertical injection borings g = 200 Red shading represents periods of treatment through the horizontal wells 100 pg/L= micrograms per liter 8 0 0 pS/cm = microSiemens per centimeter mg/L= milligrams per liter N*101 r d -100 WQO=water quality objective (not established if not shown on individual graphs) 6 o -200 M W H -300 FORMER MARLEY COOLING TOWER COMPANY 5 -400 STOCKTON,CALIFORNIA 4 -500 ACHEMICAL CONCENTRATIONS OVER TIME IN Jan.2008 Jan.2009 Jan.2010 Jan.2011 Jan. 2012 Jan.2008 Jan.2009 Jan.2010 Jan.2011 Jan.2012 SHALLOW WELL MW-105 GRAPH 11