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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 Since' Potential Reductionb Chromium VI Chromium Injection Area Wells Continued TW-15 16 15.8 -83% -84% 1/2009 Stable below WQO Variable near baseline Variable,above Variable Positive Goal achieved Revert to sitewide compliance monitoring baseline program 1/2009 Revert to sitewide compliance monitoring TW-16 <10 <0.5 -93% NM (4/2008) program Stable below WQO Near baseline Above baseline Decreasing trend Positive Goal achieved d Below baseline Continue performance monitoring; supplemental I-11 368 367 -23% -22% Exceeds Near baseline Baseline(ND) Low Positive Low evidence of increase injections are being considered Revert to sitewide compliance monitoring MW-1 3J 2.5 -83% -17% Before 2008 Stable below WQO Near baseline Near baseline Low Positive Goal achieved d program Decreased to below Revert to sitewide compliance monitoring MW-2 19 19.4 -60% -52% Before 2008 Near baseline Near baseline Low Positive Goal achieved WQO programa Increased after 2008 Decreasing after 2010 MW-213 (I-7) 1,290 1,220 -82% -83% Exceeds Increased Near baseline and 2010 injections injections,recent Positive Low Continue performance monitoring increase MW-214(I-8) <10 <0.5 -99% -100% 7/2010 Decreased to below Near baseline Increased after 2010Spiked after injections Positive Goal achieved Continue performance monitoring WQO injections decreasing MW-320 3J 2.6 -91% -94% Before 2008 Below WQO Near baseline Near baseline Low Positive Goal achieved Revert to sitewide compliance monitoring d program MW-321 (1-9) 158 158 -82% o Above WQO,recent Increased after 2010 Increased after 2010 y p g -82/o Exceeds Near baseline Positive Likely Continue performance monitoring decrease injections injections MW-322 7J 6.9 -89% -89% 4/2010 Below WQO Near baseline Above baseline Low Positive Goal achieved Continue performance monitoring Below WQO increase Revert to sitewide compliance monitoring MW-323 <10 <.0.5 -83% -98% Before 2008 Below WQO Near baseline from previous ND program Low Positive Goal achieved d Revert to sitewide compliance monitoring MW-324(I-10) 12 12.4 -71% 0% Before 2008 Below WQO Near baseline Baseline(ND) Low Positive Goal achieved d program Revert to sitewide compliance monitoring MW-361 <10 <0.5 NM NM Before 2008 Below WQO Near baseline Baseline Low Positive Goal achieved d program MW-447S 2,630 2,360 -66% -66% Exceeds Stable above WQO Near WQO ND Low Positive Low Continue performance monitoring; supplemental injections are being considered MW-447D 2,290 2,280 -34% -27% Exceeds Stable above WQO Below WQO ND Low Positive Low Continue performance monitoring; supplemental injections are being considered Variable but below Present at low Continue performance monitoring; supplemental MW-448S 2,230 2,230 -3% 0% Exceeds Stable above WQO Near WQO WQO concentrations Positive Low injections are being considered MW-448D 4,440 4,440 -65% -64% Exceeds Stable above WQO Below WQO ND Low Positive Low Continue performance monitoring; supplemental injections are being considered EW-3 12,400 12,400 -67% -63%o Exceeds Below WQO Low Positive Low Decreased but above Below WQO,recently Sampling is not required by MRP; Sampling WQO increasing ceased. Decreased after 2010 Sampling is not required by MRP; Sampling 15 13.6 -92% -94% 4/2011 Below WQO Below WQO ND injections,recent Positive Goal achieved ceased. increase EW-5 13 13.2 -76% -76% 4/2011 Below WQO Below WQO ND Decreased after 2010 Positive Goal achieved Sampling is not required by MRP injections MW-4 521 520 -35% -32% Exceeds Stable above WQO Below WQO ND Low Positive Low Sampling is not required by MRP; Sampling ceased. MW-212 95 94.5 -32% -31% Exceeds Stable above WQO Below WQO ND Low Positive Low Sampling is not required by MRP; Sampling ceased. (Page 2 of 3)