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TABLE 9 ANALYSIS OF CHROMIUM CONCENTRATIONS AND REDUCTION POTENTIAL FORMER MARLEY COOLING TOWER SITE STOCKTON,CALIFORNIA Page 1 of 3 Fourth Quarter 2012 Percent ChangeinConcentration 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 Potential Chromium Chromium VI Chromium VI Since e Reduction Injection Area Wells Below WQO after spike Revert to sitewide compliance monitoring MW-6 6J <0.5 -98% -100% 1/2011 in 10/2010 Stable above WQO Stable above WQO Low Positive Goal achieved programd Above WQO,below Low;gradual decrease MW-8 195 195 -74% -72% Exceeds baseline Near baseline Stable below WQO following 2008 Positive Low Continue performance monitoring per the MRP injections MW-9 6J <0.5 -82% NM Before 2008 Stable below WQO Above WQO, Increasing since 7/2010 Low Positive Goal achieved Continue performance monitoring per the MRP increasing 0 o Fluctuating,currently Above WQO, Revert to sitewide compliance monitoring MW-101 4J <0.5 -100% -100% 1/2009 Stable below WQO below WQO increasing Low Positive Goal achieved pro amd Stable above WQO, Above WQO,possibly Possibly decreasing, MW-102 570 568 -53% -47% Exceeds Low Positive Moderate Continue performance monitoring per the MRP decreasing increasing currently below WQO 4/2011 Above WQO, Above WQO, Spike after 2010 Revert to sitewide compliance monitoring MW-104(S-2) 4J <0.5 -100% -100% Stable below WQO Positive Goal achieved d (5/2008) increasing trend increasing trend injections,decreasing program 0 o Fluctuating above Fluctuating above Revert to sitewide compliance monitoring MW-105 <10 <0.5 -100% -100% 4/2008 Stable below WQO WQO WQO program Low Positive Goal achieved d Stable above WQO, Below WQO and Slightly above baseline MW-106 155 154 -69% -69% Exceeds Low Positive Low Continue performance monitoring per the MRP below baseline baseline (ND)but below WQO MW-204(S-8) 346 322 -92% -91% 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) 340 331 -52% -51% Exceeds Above WQO, Slightly above baseline Baseline(ND) Low Positive Low Continue performance monitoring per the MRP decreasing trend and WQO Increased after 2010 12/2010 Increased after 2010 Revert to sitewide compliance monitoring MW-206 5J NS -100% -100% (7/2010) Stable below WQO injections,slightly injections,decreasing Low Possitive Goal achieved program d below WQO 0 o Fluctuating near and Above baseline but Near baseline below Revert to sitewide compliance monitoring MW-207 50 48.2 -67% -68/o at WQO equal to the WQO below WQO WQO Low Positive Low program d 0 o Slightly above WQO Fluctuating;currently MW-208 <10 <0.5 -100% -100/o Before 2008 Stable below WQO and baseline above WQO and Low Positive Goal achieved Continue performance monitoring per the MRP baseline Above WQO and Near baseline below Revert to sitewide compliance monitoring MW-300 11 10.50 -63% -48% Before 2008 Stable below WQO baseline WQO Low Positive Goal achieved program d ° ° Decreasing,below Slightly above WQO Increased above WQO MW-301 24 23.2 -88/o -83/0 7/2012 Low Positive Low Continue performance monitoring per the MRP WQO and baseline in 2nd quarter 2012 MW-303 3J <0.5 -97% -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 4J <0.5 -88% -100% Before 2008 Stable below WQO Above baseline Above baseline Variable,decreasing Positive Goal achieved d program TW-14e <10 <0.5 -97% 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 3J <0.5 -99% NM 2008) Stable below WQO Above baseline Above baseline after injections Positive Goal achieved Continue performance monitoring per the MRP EW-1 <10 <0.5 -100% NM 5/2008 Stable below WQO Slightly above baseline Above baseline Low Positive Goal achieved Continue performance monitoring per the MRP TW-13 262 254 -97% -97% Exceeds Above baseline Above baseline Above baseline Low Positive Low Continue performance monitoring per the MRP