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TABLE 8 ANALYSIS OF CHROMIUM CONCENTRATIONS AND REDUCTION POTENTIAL FORMER MARLEY COOLING TOWER SITE STOCKTON,CALIFORNIA Current Concentration Concentration Change Concentration Description of Trend for Key Indicator Parameters Potential for Monitoring (µg/L) Since 2008 has been Further Oxidation Reduction Recommendation` Well Total Chromium Total Chromium Below 50µg/L Chromium Iron Manganese Total Organic Carbon Chromium Sincea Potential Reductionb Chromium VI Chromium Injection Area Wells Below WQO after spike Stable above WQO, Stable above WQO, Decreasing since 2008 Variable,currently MW-6 6J <0.5 -98% -100% 10/2010 Goal achieved Continue performance monitoring in 10/2010 slight increase possibly decreasing injections possitive Above WQO,below Below WQO, Decreasing since 2008 Continue performance monitoring; supplemental MW-8 320 307 -58% -56% Exceeds Near baseline Decreasing after 2008 Positive Low baseline injections injections are being considered injections Revert to sitewide compliance monitoring MW-9 <10 <0.5 -85% NM Before 2008 Stable below WQO Stable near baseline Increased since 7/2010 Low Positive Goal achieved d program Stable above baseline Revert to sitewide compliance monitoring MW-101 3J <0.5 -100% -100% 10/2008 Stable below WQO possibly decreasing program Above baseline Low Positive Goal achieved d MW-102 825 825 -31% -24% Exceeds Stable above WQO Near baseline,possibly Stable above baseline Low Positive Moderate Continue performance monitoring decreasing 0 0 1/2011 Recent increase,now Stable above baseline, Spike after 2010 MW-104(S-2) <10 <0.5 -100% -100% (4/2008) below WQO possibly decreasing Above baseline injections Negative Likely Continue performance monitoring MW-105 8J <0.5 -99% -100% 4/2008 Stable below WQO Above baseline Above baseline Low to moderate Positive Goal achieved Revert to sitewide compliance monitoringd program MW-106 157 157 -69% -69% Exceeds Above WQO,below Near baseline Below WQO. Slight Decreased to baseline Positive Low Continue performance monitoring baseline increase above baseline MW-204(S-8) 2,200 2,190 -50% -40% Exceeds Stable above WQO Near baseline Previously increased, Low Positive Low Continue performance monitoring; supplemental and possibly decreasing injections are being considered MW-205(S-7) 450 450 -37% -34% Exceeds Stable above WQO Near baseline Baseline(ND) Low Positive Low Continue performance monitoring; supplemental injections are being considered Increased after 2010 12/2010 Increased after 2010 Increased after 2010 Decreased after 2010 MW-206 <10 <0.5 -100% -100% (7/2010) Decreased below WQO injections injections injections,and now injections Goal achieved Continue performance monitoring decreasing MW-207 29 28.8 -81% -81% 7/2011 Stable below WQO Near baseline Near baseline Low Positive Goal achieved Continue performance monitoring; supplemental injections are being considered Above baseline Revert to sitewide compliance monitoring MW-208 <10 <0.5 -97% -100% Before 2008 Stable below WQO Near baseline decreasing program Variable Positive Goal achieved d Revert to sitewide compliance monitoring MW-300 10 9.94 -67% -50% Before 2008 Stable below WQO Near baseline Baseline(ND) Low Positive Goal achieved d program MW-301 135 135 -6% -4% Exceeds Stable above WQO Near baseline Baseline(ND) Low Positive Low Continue performance monitoring 0 o Spiked in 2009, since Revert to sitewide compliance monitoring MW-303 5J <0.5 -94% -100/o Before 2008 Stable below WQO Near baseline Above baseline decreased program Positive Goal achieved d Revert to sitewide compliance monitoring TW-12 3J <0.5 -91% -98% Before 2008 Stable below WQO Above baseline Above baseline Variable,decreasing Positive Goal achieved d program 1/2009(Before Revert to sitewide compliance monitoring TW-14 <10 <0.5 -94% NM 2008) Stable below WQO Above baseline Above baseline Low Positive Goal achieved d program 1/2009(Before Decreasing from high Revert to sitewide compliance monitoring TW-17 <10 <0.5 -98% NM 2008) after injections program Stable below WQO Above baseline Above baseline Positive Goal achieved d Revert to sitewide compliance monitoring EW-1 <10 <0.5 -86% NM 5/2008 Stable below WQO Near baseline Above baseline Low Positive Goal achieved d program TW-13 3J <0.5 -100% -100% 4/2010 Stable below WQO Above baseline Above baseline Low Positive Goal achieved Continue performance monitoring (Page 1 of 3)