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TABLE 8 ANALYSIS OF CHROMIUM CONCENTRATIONS AND REDUCTION POTENTIAL FORMER MARLEY COOLING TOWER SITE STOCKTON,CALIFORNIA Current Concentration Percent Change in Concentration Description of Trend for Key Indicator Parameters Concentrations from Potential for Monitoring (µg/L) has been Further Maximum Oxidation Reduction Recommendation Well Total Chromium Total Chromium Below 50µg/L Chromium Iron Manganese Total Organic Carbon Potential Chromium Chromium VI Chromium VI Sincea Reduction Injection Area Wells Below WQO after spike Stable above WQO Stable above WQO, Variable currently Revert to sitewide compliance monitoring MW-6 6J <0.5 -98% -100% 10/2010 in 10/2010 possibly decreasing slight increase Low possitive Goal achieved programa Below WQO, o Above WQO,below Decreasing since 2008 MW-8 544 519 -28% -26% Exceeds baseline injections Near baseline Decreasing after 2008 Positive Low Continue performance monitoring per the MRP injections MW-9 5J <0.5 -85% NM Before 2008 Stable below WQO Stable below WQO, Increasing since 7/2010 Low Positive Goal achieved Continue performance monitoring per the MRP near baseline Revert to sitewide compliance monitoring MW-101 5J <0.5 -100% -100% 10/2008 Stable below WQO Below WQO Above baseline Low Positive Goal achieved a program MW-102 615 600 -49% -44% Exceeds Stable above Near baseline,possibly Stable above baseline Low Positive Moderate Continue performance monitoring per the MRP WQO,decreasing trend decreasing 1/2011 Above WQO Above WQO Spike after 2010 Revert to sitewide compliance monitoring MW-104(S-2) <10 <0.5 -100% -100% Stable below WQO Positive Goal achieved a (4/2008) increasing trend increasing trend injections,decreasing program Above WQO and Above WQO and Revert to sitewide compliance monitoring MW-105 4J <0.5 -99% -100% 4/2008 Stable below WQO baseline,on a flucuating baseline,on a flucuating Low to moderate Negative Goal achieved a decreasign trend decreasign trend program MW-106 232 225 -54% -55% Exceeds Stable above WQO, Below WQO and Baseline(ND) Low Positive Low Continue performance monitoring per the MRP below baseline baseline MW-204(S-8) 500 497 -89% -86% Exceeds Above WQO, Slightly above WQO Previously increased, Low Positive Low Continue performance monitoring per the MRP decreasing trend and baseline and possibly decreasing MW-205(S-7) 363 342 -49% -50% Exceeds Above WQO, Below WQO and Baseline(ND) Low Positive Low Continue performance monitoring per the MRP decreasing trend baseline Increased after 2010 12/2010 Increased after 2010 Revert to sitewide compliance monitoring MW-206 6J <0.5 -100% -100% Stable below WQO injections,decreasing Low Possitive Goal achieved a (7/2010) near WQO injections,decreasing program 0 o Fluctuating near and Revert to sitewide compliance monitoring MW-207 58 56.3 -62% -62/o Exceeds currently above WQO Near baseline Increasing,above WQO Low Positive Low pro ram MW-208 <10 <0.5 -97% ° Slightly above WQO, Increase in 2nd quarter Revert to sitewide compliance monitoring -100% Before 2008 Stable below WQO below baseline 2012 program Low Positive Goal achieved a Below WQO and Revert to sitewide compliance monitoring MW-300 12 9.73 -60% -51% Before 2008 Stable below WQO Baseline(ND) Low Positive Goal achieved a baseline program MW-301 63 59.6 -68% -57% Exceeds Fluctuating near and Slightly above WQO Increase in 2nd quarter Low Positive Low Continue performance monitoring per the MRP currently above WQO and baseline 2012 MW-303 5J <0.5 -94% -100% Before 2008 Stable below WQO Near baseline Above baseline Spiked in 2009,since Positive Goal achieved Continue performance monitoring per the MRP decreased Revert to sitewide compliance monitoring TW-12 6J <0.5 -82% -98% Before 2008 Stable below WQO Above baseline Above baseline Variable,decreasing Positive Goal achieved a program TW-14e <10 <0.5 -94% NM 1/2009(Before Stable below WQO Above baseline Above baseline Low Positive Goal achieved Continue performance monitoring per the MRP 2008) 1/2009(Before Decreasing from high TW-17 <10 <0.5 -98% NM Stable below WQO Above baseline Above baseline Negative Goal achieved Continue performance monitoring per the MRP 2008) after injections EW-1 <10 <0.5 -86% NM 5/2008 Stable below WQO Slightly above WQO, Above baseline Low Positive Goal achieved Continue performance monitoring per the MRP below baseline Revert to sitewide compliance monitoring TW-13 6J <0.5 -100% -100% 4/2010 Stable below WQO Above baseline Above baseline Low Positive Goal achieved a program (Page 1 of 3)