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TABLE 7
<br /> TOTAL AND HEXAVALENT CHROMIUM RESULTS EVALUATION
<br /> 2013 SEMIANNUAL GROUNDWATER MONITORING REPORT
<br /> FORMER MARLEY COOLING TOWER SITE
<br /> STOCKTON,CALIFORNIA
<br /> Page 4 of 4
<br /> Total Chromium and Chromium VI(pg(L)
<br /> Percent Change in
<br /> Monitoring Well Screened Water- Chemical Name 4th Qtr and 4th Qtr Supplemental Concentration from
<br /> Location bearing Zone Compliance(October Sampling(December 1st Qtr Compliance 2nd Qtr Compliance Supplemental(May Supplemental(June 3rd Qtr Compliance Supplemental(August 4th Qtr Compliance 1st Qtr Compliance 2nd Qtr Compliance 3rd Qtr Compliance 4th Qtr Compliance 1st Qtr Compliance 2nd Qtr Compliance
<br /> 2010) 2010)
<br /> (January 2011) (Apri12011) 2011) 2011) (July 2011) 2011) (October 2011) (January 2012) (April 2012) (July 2012) (October 2012) (January 2013) (April 2013) Maximum***
<br /> MW-323 Intermediate Chromium 16 NS 11 71 NS NS 10 NS <10 71 81 91 <10 81 NS -72%
<br /> Chromium VI <10 NS 4.73 4.04 NS NS <10 NS <0.5 6.6 6.44 5.53 6.05 6.64 NS -34%
<br /> MW-324(1-10) Intermediate Chromium 17 14 12 16 15 15 13 15 12 14 18 19 16 17 15 -64%
<br /> Chromium Vi <10 10.4 10.6 10.5 10 10 10 12.1 12.4 13.7 15.1 16.7 15.2 17.0 14.7 -12%
<br /> MW-361 Deep Chromium 4.1 NS <10 <10 NS NS <10 NS <10 <10 <10 <10 <10 <10 NS NM
<br /> Chromium VI <10 NS <0.5 <0.5 NS NS <10 NS <0.5 <0.5 <0.5 <0.5 NS NS NS NM
<br /> MW-363 Intermediate Chromium 51 NS 3J NS NS NS NS NS NS NS NS 32 35 NS NS NM
<br /> Chromium Vl <10 NS 1.91 NS NS NS NS NS NS NS NS 30.0 34.5 NS NS NM
<br /> MW-4475 Intermediate Chromium 7,700 6,990 6,650 6,020 5,910 5,130 4,950 815 2,630 2,240 2,160 716 711 590 627 -92%
<br /> Chromium VI 7,670 6,510 5,740 5,980 5,880 5,200 3,350 753 2,630 2,200 1,990 700 698 590 508 -93%
<br /> MW-447D Intermediate Chromium 3,350 2,960 3,460 1,620 2,130 2,600 2,370 2,040 2,290 2,650 2,290 2,350 2,300 1,630 71800 48%
<br /> Chromium VI 3,120 2,730 3,110 1,600 1,920 2,290 1,870 1,950 2,280 2,580 2,150 2,250 2,250 1,620 1,790 -43%
<br /> MW-4485 Intermediate Chromium 2,120 2,170 2,280 1,370 1,350 1,570 1,820 2,240 2,230 2,400 2,570 2,620 2,480 2,450 2,780 0%
<br /> Chromium VI 2,110 2,010 2,030 1,210 1,150 1,570 1,530 2,150 2,230 2,370 2,540 2,550 2,470 2,440 2,730 0%
<br /> MW-448D Intermediate Chromium 12,800 10,800 9,790 7,870 9,240 9,770 9,170 8,320 4,440 2,910 2,460 2,090 2,930 1,470 3,900 -70%
<br /> Chromium VI 12,500 10,300 8,410 7,500 9,040 9,000 8,570 8,220 4,440 2,800 2,360 1,970 2,860 1,460 3,880 -69%
<br /> Chromium NS NS NS NS NS NS NS NS NS NS NS 2,680 1,750 1,770 1,940 -28%
<br /> MW-4495 Intermediate Chromium Vl NS NS NS NS NS NS NS NS NS NS NS 2,620 1,720 1,740 1,930 -26%
<br /> Chromium NS NS NS NS NS NS NS NS NS NS NS 5,710 6,320 7,500 81600 0%
<br /> MW-449D Intermediate Chromium VI NS NS NS NS NS NS NS NS NS NS NS 5,700 6,610 7,490 8,550 0%
<br /> Chromium NS NS NS NS NS NS NS NS NS NS NS 4,040 4,400 4,800 5,200 0%
<br /> MW-4505 Intermediate Chromium Vl NS NS NS NS NS NS NS NS NS NS NS 3,870 4,360 4,700 5,160 0%
<br /> Chromium NS NS NS NS NS NS NS NS NS NS NS 100 85 100 164 64%
<br /> MW-450D Intermediate Chromium VI NS NS NS NS NS NS NS NS NS NS NS 87.8 85.0 16.6 144.0 0%
<br /> EW-3 Intermediate Chromium NS 31,700 37,100 10,100 NS NS 5,210 NS 12,400 4700 NS 12,600 11,400 25,000 27,000 -27%
<br /> Chromium VI NS 28,800 33,300 8,510 NS NS 3,580 NS 12,400.0 4650 NS 12,500 12,000 24,600 26,200 -21%
<br /> EW-4 Intermediate Chromium NS 29 194 38 NS NS 23 NS 15 NS NS NS NS NS NS -92%
<br /> Chromium VI NS 28 232 26 NS NS 10 NS 13.6 NS NS NS NS NS NS -94%
<br /> EW-5 Intermediate Chromium NS 55 54 18 NS NS 16 NS 13 NS NS NS NS NS NS -76%
<br /> Chromium VI NS 54.6 52.7 8.4 NS NS 10 NS 13.2 NS NS NS NS NS NS -76%
<br /> MW-4 Intermediate Chromium NS 770 800 524 691 686 586 589 521 NS NS 982 1,050 1,060 1,130 0%
<br /> Chromium VI NS 696 765 516 620 660 360 559 520 NS NS 981 1,030 1,050 1,120 0%
<br /> MW-212 Intermediate Chromium NS 132 140 87 100 99 80 76 95 NS NS NS NS NS NS -32%
<br /> Chromium VI NS 131 136 82 100 110 60 72 94.5 NS NS NS NS NS NS -31%
<br /> MW-7 Shallow Chromium 13 NS 91 13 NS NS 81 NS <10 6J 81 91 6J 91 NS -83%
<br /> Chromium VI <10 NS 3.03 3.77 NS NS <10 NS 0.88 5.24 5.35 4.96 NS NS NS -75%
<br /> MW-201 Shallow Chromium 15 NS 21 23 NS NS 10 NS 13 17 14 18 14 3J 14 -78%
<br /> Chromium VI <10 NS 8.98 10 NS NS <10 NS 9.74 9.4 10.70 8.48 NS NS NS -21%
<br /> MW-202 Shallow Chromium 15 NS 12 7J NS NS 6J NS M 5J 10 13 7J 4J NS -88%
<br /> Chromium VI <10 NS 3.36 2.67 NS NS <10 NS 1.57 4.08 4.46 4.41 NS NS NS _1%
<br /> MW-210 Shallow Chromium 17 NS 6J 81 NS NS 4J NS <10 3J 51 4J 4J <10 NS -76%
<br /> Chromium VI <10 NS 1.26 1.31 NS NS <10 NS <0.5 1.26 1.00 0.93 NS NS NS -29%
<br /> MW-302 Shallow Chromium 10 NS 6J 81 NS NS M NS 4J <10 <10 4J 4J <10 NS -100%
<br /> Chromium VI <10 NS 2.04 1.59 NS NS <10 NS 2.11 1.47 1.35 1.02 NS NS NS -52%
<br /> MW-304 Shallow Chromium 20 NS 27 15 NS NS 17 NS 6J 10 12 16 11 10 11 -69%
<br /> Chromium VI <10 NS 8.06 8.04 NS NS <10 NS 3.13 9.03 8.27 8.32 NS NS NS -17%
<br /> MW-401 Shallow Chromium 5J NS <10 M NS NS <10 NS <10 <10 <10 M <10 <10 NS -100%
<br /> Chromium VI <10 NS 0.98 0.74 NS NS <10 NS <0.5 <0.5 1.11 1.22 NS NS NS 0%
<br /> MW-310 100-Foot Sand Chromium 26 NS 19 14 NS NS 17 NS <10 81 10 15 91 91 91 -80%
<br /> Chromium VI <10 NS 7.44 7.04 NS NS <10 NS <0.5 5.12 8.36 7.82 NS NS NS -6%
<br /> MW-211 Intermediate Chromium 10 NS 51 5J NS NS 4 NS <10 M M 4J M 3J NS -82%
<br /> Chromium VI <10 NS 1.78 2.07 NS NS <10 NS 0.61 2.09 1.96 2.06 NS NS NS _1%
<br /> MW-325 Intermediate Chromium 14 NS 12 81 NS NS <10 NS <10 8J 8J 91 8J SJ 81 -74%
<br /> Chromium VI <10 NS 6.13 3.55 NS NS <]0 NS <0.5 7 7.82 5.57 NS NS NS -29%
<br /> Notes:
<br /> *=April 2007 data from Dudek M&S Report
<br /> **=baseline samples
<br /> ***=The comparison is between the most recent concentration and the maximum concentration reported since the baseline sampling event in 2008.A value of zero indicates the current concentration is the highest.
<br /> Bold=Concentration greater than Water Quality Objective(WQO)
<br /> J=Estimated laboratory value
<br /> pl Q=microgram per liter
<br /> NM=not meaningful because the chemical has not been detected above the laboratory analytical reporting limit.
<br /> NS=not sampled
<br /> UJ=Non-detect value is estimated
<br />
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