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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 Ke Indicator Parameters Concentrations from p y Potential for Monitoring (µg/L) has been Further Well Maximum Below 50 /L Chromium Recommendation Total Chromium Total Chromium Rg Chromium Iron Manganese Total Organic Carbon Oxidation Reduction Sincea Potential Reductionb Chromium VI Chromium VI Injection Area Wells Continued TW-15 24 20.6 -74% -79% 1/2009 Stable below WQO Slightly above WQO Variable,above Variable,decreasing Positive Goal achieved Continue performance monitoring per the MRP and baseline baseline TW-16 4J <0.5 -93% NM 1/2009 Stable below WQO Slightly above WQO Above baseline Decreasing trend Positive Goal achieved Continue performance monitoring per the MRP (4/2008) and baseline I-11 510 507 0% 0% Exceeds Previous increasing Below WQO and Baseline(ND) Low Positive Low Continue performance monitoring per the MRP trend is leveling out baseline Below WQO and Below WQO and Revert to sitewide compliance monitoring MW-1 3J 1.42 -83% -53% Before 2008 Stable below WQO Low Positive Goal achieved a baseline baseline program Below WQO and Revert to sitewide compliance monitoring MW-2 16 15.9 -66% -60% Before 2008 Stable below WQO Baseline(ND) Low Positive Goal achieved a baseline program Below WQO and near Increased after 2008 MW-213(1-7) 5,410 5,120 -25% -29% Exceeds Fluctuating baseline and 2010 injections, Low Positive Low Continue performance monitoring per the MRP starting to decrease MW-214(I-8) <10 <0.5 -99% -100% 7/2010 Stable below WQO Below WQO and near Decreasing trend,above Low Positive Goal achieved Revert to sitewide compliance monitoring baseline WQO program MW-320 11 10.9 -67% ° Below WQO and Revert to sitewide compliance monitoring -73/o Before 2008 Below WQO baseline program Baseline(ND) Low Positive Goal achieved a Below WQO and Increased after 2010 Increased after 2010 MW-321 (I-9) 4J 0.43J -100% -100% 4/2012 Below WQO Positive Goal achieved Continue performance monitoring per the MRP baseline injections injections, MW-322 20 17.4 -68% -71% 4/2010 Below WQO Below WQO and near Above baseline Low Positive Goal achieved Continue performance monitoring per the MRP baseline Below WQO and near Revert to sitewide compliance monitoring MW-323 81 6.44 -72% -36% Before 2008 Stable above WQO Baseline(ND) Low Positive Goal achieved a baseline program MW-324(I-10) 18 15.1 -57% 0% Before 2008 Stable above WQO Below WQO and near Baseline(ND) Low Positive Goal achieved Continue performance monitoring per the MRP baseline Below WQO and near Near WQO and below Revert to sitewide compliance monitoring MW-361 <10 <0.5 NM NM Before 2008 Stable above WQO Low Positive Goal achieved a baseline baseline program MW-447S 2,160 1,990 -72% -74% Exceeds Above WQO, Near WQO Below WQO Low Positive Low Continue performance monitoring per the MRP decreasing trend MW-447D 2,290 2,150 -34% -31% Exceeds Stable above WQO Below WQO and ND Low Positive Low Continue performance monitoring per the MRP baseline MW-448S 2,570 2,540 0% 0% Exceeds Stable above WQO Near WQO and below Below WQO,Non- Low Positive Low Continue performance monitoring per the MRP baseline detect MW-448D 2,460 2,360 -81% -81% Exceeds Above WQO, Below WQO and ND Low Positive Low Continue performance monitoring per the MRP decreasing trend baseline EW-3 4,700 4,650 -87% -86%o Exceeds Decreased but above Below WQO and WQO baseline ND Low Positive Low Continue performance monitoring per the MRP Decreased after 2010 Sampling is not required b MRP;Sampling EW-4e 15 13.6 -92% -94% 4/2011 Below WQO Below WQO ND injections,recent Positive Goal achieved p g q y p g ceased. increase 0 o Decreased after 2010 Sampling is not required by MRP;Sampling EW-5 13 13.2 -76/o -76/0 4/2011 Below WQO Below WQO ND Positive Goal achieved injections ceased. MW-4e 521 520 -35% -32% Exceeds Stable above WQO Below WQO ND Low Positive Low Continue performance monitoring per the MRP Revert to sitewide compliance monitoring MW-212e 95 94.5 -32% -31% Exceeds Stable above WQO Below WQO ND Low Positive Low a program (Page 2 of 3)