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TABLE 8 ANALYSIS OF CHROMIUM CONCENTRATIONS AND REDUCTION POTENTIAL FORMER MARLEY COOLING TOWER SITE STOCKTON,CALIFORNIA Page 2 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(Continued) TW-15 10 6.16 -89% -94% 1/2009 Below WQO Below WQO and Above baseline, Low Positive Goal achieved Continue performance monitoring per the MRP baseline decreasing TW-16 <10 <0.5 -100% NM 1/2009 Stable below WQO Slightly below WQO Fluctuating;above Low Positive Goal achieved Continue performance monitoring per the MRP (4/2008) and baseline WQO I-11 100 82 -80% -84% Exceeds Decreasing Below WQO Above WQO Low Positive Low Continue performance monitoring per the MRP Below WQO and Below WQO and Reverted to MRP Section I Groundwater MW-1 <10 NS -100% -24% Before 2008 Stable below WQO baseline baseline Low Positive Goal achieved Monitorign Requirements Below WQO,slightly Reverted to MRP Section I Groundwater MW-2 22 21.2 -53% -47% Before 2008 Stable below WQO above baseline Baseline(ND) Low Positive Goal achieved Monitorign Requirements MW-213(I-7) 2,600 2,560 -64% -64% Exceeds Fluctuating Below WQO Above WQO, Low Positive Low Continue performance monitoring per the MRP decreasing MW-214(I-8) <10 <0.5 -100% -100% 7/2010 Stable below WQO Above WQO FluctuatingReverted to MRP Section I Groundwater above WQO trend, Low Positive Goal achieved Monitorign Requirements MW-320 49 49.10 0% 0% Before 2008 At or below WQO Below WQO Below WQO Low Positive Goal achieved Continue performance monitoring per the MRP MW-321 (I-9) 10 7.16 -99% -99% 1/2012 Below WQO Below WQO and Fluctuating trend, Low Positive Goal achieved Continue performance monitoring per the MRP baseline above WQO 0 o Below WQO, Below WQO and above Fluctuating trend, MW-322 14 13.3 -78/o -78/0 4/2010 decreasing trend baseline above WQO Low Positive Goal achieved Continue performance monitoring per the MRP Below WQO, Below WQO, Reverted to MRP Section I Groundwater MW-323 8J 6.64 -72% -34% Before 2008 Stable below WQO fluctuating fluctuating Low Positive Goal achieved Monitorign Requirements MW-324(I-10) 15 14.7 -64% -12% Before 2008 Stable below WQO Below WQO, Baseline(ND) Low Positive Goal achieved Continue performance monitoring per the MRP fluctuating MW-361 <10 <0.5 0% 0% Before 2008 Stable below WQO Below WQO Below WQO Low Positive Goal achieved Reverted to MRP Section I Groundwater Monitorign Requirements MW-4475 627 508 -92% -93% Exceeds Above WQO, Below WQO Above WQO Low Positive Low Continue performance monitoring per the MRP decreasing MW-447D 1,800 1,790 -48% -43% Exceeds Fluctuating above Increased since fourth Below WQO Below WQO Positive Moderate Continue performance monitoring per the MRP WQO,decreasing quarter 2012 MW-4485 2,780 2,730 0% 0% Exceeds Stable above WQO Below WQO and Non-detect Low Positive Low Continue performance monitoring per the MRP baseline MW-448D 3,900 3,880 -70% -69% Exceeds Above WQO, Below WQO and Non-detect Low Positive Low Continue performance monitoring per the MRP fluctuating trend baseline MW-4495 1,940 1,930 -28% -26% Exceeds Above WQO, Above WQO, Below WQO Low Positive Low Continue performance monitoring per the MRP fluctuating trend decreasing MW-449D 8,600 8,550 0% 0% Exceeds Above WQO, Below WQO and Non-detect Low Positive Low Continue performance monitoring per the MRP increasing trend baseline MW-4505 5,200 5,160 0% 0% Exceeds Above WQO, Below WQO and Non-detect Low Positive Low Continue performance monitoring per the MRP increasing trend baseline MW-450D 164 144.0 64% 0% Exceeds Above WQO, Below WQO and Non-detect Low Positive Low Continue performance monitoring per the MRP fluctuating trend baseline EW-3 27,000 26,200 -27% -21% Exceeds Increasing trend above Near WQO and Below WQO,Increase Low Positive Low Continue performance monitoring per the MRP WQO baseline in 1/2013 MW-4 1,130 1,120 0% 0% Exceeds Stable above WQO Below WQO Non-detect Low Positive Low Continue performance monitoring per the MRP