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TABLE 8 ANALYSIS OF CHROMIUM CONCENTRATIONS AND REDUCTION POTENTIAL FORMER MARLEY COOLING TOWER SITE STOCKTON,CALIFORNIA Page 1 of 3 Percent Change in Most Recent Concentration Description of Trend for Key Indicator Parameters Potential for Monitoring Concentration(µ Concentrations fromg/L) has been Further Maximum Oxidation Reduction Recommendation` Well Total Chromium Total Chromium Below 50µg/L Chromium Iron Manganese Total Organic Carbon Chromium Potential Chromium VI Chromium VI Since' Reduction Injection Area Wells Below WQO after spike Reverted to MRP Section I Groundwater MW-6 29 16.2 91% 91% 1/2011 in 10/2010 Stable above WQO Decreasing above WQO Low Positive Goal achieved Monitorign Requirements Above WQO,below Reverted to MRP Section I Groundwater MW-8 175 175 -77% -75% Exceeds baseline,decreasing Near baseline Stable below WQO Low;decreasing Positive Low Monitorign Requirements MW-9 3J <0.5 -91% NM Before 2008 Stable below WQO Above WQO, Above WQO, Low Positive Goal achieved Continue performance monitoring per the MRP fluctuating fluctuating ° ° Fluctuating,currently Above WQO Reverted to MRP Section I Groundwater MW-101 <10 <0.5 -100/o -100/0 1/2009 Stable below WQO below WQO fluctuating Low Positive Goal achieved Monitorign Requirements Stable above WQO, Above WQO Above WQO Reverted to MRP Section I Groundwater MW-102 735 731 -39% -32% Exceeds decreasing increasing increasing Low Positive Moderate Monitorign Requirements 4/2011 Above WQO Above WQO Spike after 2010 Reverted to MRP Section I Groundwater MW-104(S-2) <10 <0.5 -100% -100% (5/2008) Stable below WQO increasing trend increasing trend injections,decreasing Positive Goal achieved Monitorign Requirements MW-105 <10 <0.5 -100% -100% 4/2008 Stable below WQO Below WQO Decreasing, above Reverted to MRP Section I Groundwater Low Positive Goal achieved Monitorign Requirements Stable above WQO, Above WQO Reverted to MRP Section I Groundwater MW-106 195 192 -61% -62% Exceeds below baseline fluctuating Below WQO Low Positive Low Monitorign Requirements MW-204(S-8) 6J <0.5 -100% -100% 4/2013 Below WQO Slightly above WQO Increasing,above WQO Low Positive Goal achieved Continue performance monitoring per the MRP and baseline MW-205(S-7) 450 339 -37% -50% Exceeds Stable above WQO, Slightly above WQO Baseline(ND) Low Positive Low Continue performance monitoring per the MRP below baseline 12/2010 Decreasing,above Reverted to MRP Section I Groundwater MW-206 6J <0.5 -100% -100% (7/2010) Stable below WQO Slightly above WQO WQLow Positive Goal achieved Monitorign Requirements Fluctuatingbelow the Reverted to MRP Section I Groundwater MW-207 21 21.2 -86% -86% 7/2012 WO Below WQO Below WQO Low Positive Goal achieved Monitorign Requirements Slightly above WQO Fluctuating;above Reverted to MRP Section I Groundwater MW-208 <10 <0.5 -100% -100% Before 2008 Stable below WQO and baseline WQO,increasing Low Positive Goal achieved Monitorign Requirements Below WQO and Near baseline,below Reverted to MRP Section I Groundwater MW-300 9J 7.45 -70% -63% Before 2008 Stable below WQO baseline WQO Low Positive Goal achieved Monitorign Requirements MW-301 12 9.29 -94% -93% 7/2012 Below WQO Slightly above WQO Stable above WQO Low Positive Goal achieved Continue performance monitoring per the MRP and baseline MW-303 <10 <0.5 -100% -100% Before 2008 Stable below WQO Decreasing near WQO Stable above WQO Low Positive Goal achieved Continue performance monitoring per the MRP Above WQO, Above WQO, Reverted to MRP Section I Groundwater TW-12 <10 <0.5 -100% -100% Before 2008 Stable below WQO increasing increasing Low Positive Goal achieved Monitorign Requirements 1/2009(Before Above WQO, Decreasing,above TW-14 <10 <0.5 -100% NM 2008) Stable below WQO fluctuating WQO Low Positive Goal achieved Continue performance monitoring per the MRP ° 1/2009(Before Above WQO, Above WQO, TW-17 <10 <0.5 -100/o NM 2008) Stable below WQO fluctuating increasing Low Positive Goal achieved Continue performance monitoring per the MRP EW-1 <10 <0.5 -100% NM 5/2008 Stable below WQO Below WQO Fluctuating;above Low Positive Goal achieved Continue performance monitoring per the MRP Below WQO after spike Above WQO, Above WQO Reverted to MRP Section I Groundwater TW-13 31 <0.5 -100% -100% 1/2013 in 10/2012 fluctuatingfluctuatingLow Positive Goal achieved Monitorign Requirements