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TABLE 7
<br /> TOTAL AND HEXAVALENT CHROMIUM RESULTS EVALUATION
<br /> 2012 ANNUAL GROUNDWATER MONITORING REPORT
<br /> FORMER MARLEY COOLING TOWER SITE
<br /> STOCKTON,CALIFORNIA
<br /> Page 4 of 4
<br /> Total Chromium and Chromium VI(µg/L) Percent Change in
<br /> Monitoring Well Screened Water- Chemical Name 4th Qtr Supplemental Concentration from
<br /> Location bearing Zone 3rd Qtr and 4th Qtr and Compliance 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 ***
<br /> Compliance(July 2010) (October 2010) (January 2011) (Apri12011) 2011) 2011) (July 2011) 2011) (October 2011) (January 2012) (April 2012) (July 2012) (October 2012) Maximum
<br /> 2010)
<br /> Chromium 14 16 NS 11 7J NS NS 10 NS <10 7J 81 91 <10 -100%
<br /> MW-323 Intermediate Chromium VI <10 <10 NS 4.73 4.04 NS NS <10 NS <0.5 6.6 6.44 5.53 6.05 -40%
<br /> Chromium 22 17 14 12 16 15 15 13 15 12 14 18 19 16 -62%
<br /> MW-324(I-10) Intermediate Chromium VI 10 QO 10.4 10.6 10.5 10 10 10 12.1 12.4 13.7 15.1 16.7 15.2 -9%
<br /> MW-361 Deep Chromium 3 4J NS <10 <10 NS NS <10 NS <10 <10 <10 <10 <10 NM
<br /> Chromium VI <10 <10 NS <0.5 <0.5 NS NS <10 NS <0.5 <0.5 <0.5 <0.5 NS NM
<br /> MW-363 Intermediate Chromium NS 5J NS 3J NS NS NS NS NS NS NS 32 35 NM
<br /> Chromium VI NS <10 L NS 1.9 NS NS NS NS NS NS NS 30.0 34.5 NM
<br /> Chromium 7,090 7,700 6,990 6,650 6,020 5,910 5,130 4,950 815 2,630 2,240 2,160 716 711 -91%
<br /> MW-4475 Intermediate Chromium VI 7,080 7,670 6,510 5,740 5,980 5,880 5,200 3,350 753 2,630 2,200 1,990 700 698 -91%
<br /> Chromium 2,530 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 -34%
<br /> MW-447D Intermediate Chromium VI 2,360 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 -28%
<br /> Chromium 2,300 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 -5%
<br /> MW-4485 Intermediate Chromium VI 2,220 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 -3%
<br /> MW-448D Intermediate Chromium 4,110 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 -77%
<br /> Chromium VI 4,060 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 -77%
<br /> MW-4495 Intermediate Chromium NS NS NS NS NS NS NS NS NS NS NS NS 2,680 1,750 -35%
<br /> Chromium VI NS NS NS NS NS NS NS NS NS NS NS NS 2,620 1,720 -34%
<br /> Chromium NS NS NS NS NS NS NS NS NS NS NS NS 5,710 6,320 0%
<br /> MW-449D Intermediate Chromium VI NS NS NS NS NS NS NS NS NS NS NS NS 5,700 6,610 0%
<br /> MW-4505 Intermediate Chromium NS NS NS NS NS NS NS NS NS NS NS NS 4,040 4,400 0%
<br /> Chromium VI NS NS NS NS NS NS NS NS NS NS NS NS 3,870 4,360 0%
<br /> Chromium NS NS NS NS NS NS NS NS NS NS NS NS 100 85 -15%
<br /> MW-450D Intermediate Chromium VI NS NS NS NS NS NS NS NS NS NS NS NS 87.8 85.0 -3%
<br /> EW-3 Intermediate Chromium NS NS 31,700 37,100 10,100 NS NS 5,210 NS 12,400 4700 NS 12,600 11,400 -69%
<br /> Chromium VI NS NS 28,800 33,300 8,510 NS NS 3,580 NS 12,400.0 4650 NS 12,500 12,000 -64%
<br /> Chromium NS NS 29 194 38 NS 23 NS 15 NS NS NS NS -92%
<br /> EW-4 Intermediate Chromium VI NS NS 28 232 26 NS 10 NS 13.6 NS NS NS NS -94%
<br /> Chromium NS NS 55 54 18 NS NS 16 NS 13 NS NS NS NS -76%
<br /> EW-5 Intermediate Chromium VI NS NS 54.6 52.7 8.4 NS NS 10 NS 13.2 NS NS NS NS -76%
<br /> Chromium NS NS 770 800 524 691 686 586 589 521 NS NS 982 1,050 0%
<br /> MW-4 Intermediate Chromium VI NS NS 696 765 516 620 660 360 559 520 NS NS 981 1,030 0%
<br /> MW-212 Intermediate Chromium NS NS 132 140 87 100 99 80 76 95 NS NS NS NS -32%
<br /> Chromium VI NS NS 131 136 82 100 110 60 72 94.5 NS NS NS NS -31%
<br /> Chromium 13 13 NS 9J 13 NS NS 8J NS <10 6J 8J 9J 6J -89%
<br /> MW-7 Shallow Chromium VI QO QO NS 3.03 3.77 NS NS QO NS 0.88 5.24 5.35 4.96 NS -75%
<br /> MW-201 Shallow Chromium 32 15 NS 21 23 NS NS 10 NS 13 17 14 18 14 -78%
<br /> Chromium VI 10 <10 NS 8.98 10 NS NS <10 NS 9.74 9.4 10.70 8.48 NS -21%
<br /> MW-202 Shallow Chromium 8 15 NS 12 7J NS NS 6J NS 3J 5J 10 13 7J -79%
<br /> Chromium VI QO QO NS 3.36 2.67 NS NS QO NS 1.57 4.08 4.46 4.41 NS _1%
<br /> MW-210 Shallow Chromium 10 17 NS 6J 8J NS NS 4J NS <10 3J 5J 4J 4J -76%
<br /> Chromium VI <10 <10 NS 1.26R8.04
<br /> NS NS <10 NS <0.5 1.26 1.00 0.93 NS -29%
<br /> MW-302 Shallow Chromium 9 10 NS 6J NS NS 3J NS 4J <10 <10 4J 4J -89%
<br /> Chromium VI <10 <10 NS 2.04 NS S QO NS 2.11 1.47 1.35 1.02 NS -52%
<br /> MW-304 Shallow Chromium 27 20 NS 27 NS NS 17 NS 6J 10 12 16 11 -69%
<br /> Chromium VI 10 <10 NS 8.06 NS NS <10 NS 3.13 9.03 8.27 8.32 NS -17%
<br /> MW-401 Shallow Chromium 4 5J NS <10 <10 NS <10 <10 <10 3J <10 -100%
<br /> Chromium VI QO QO NS 0.98 NS QO NS <0.5 <0.5 1.11 1.22 NS 0%
<br /> MW-310 100-Foot Sand Chromium 30 26 NS 19 NS NS 17 NS <10 81 10 15 91 -80%
<br /> Chromium VI <10 <10 NS 7.44 7.04 NS NS <10 NS <0.5 5.12 8.36 7.82 NS -6%
<br /> Chromium 11 10 NS SJ NS S 777 4 NS <10 3J 3J 4J 3J -82%
<br /> MW-211 Intermediate Chromium VI <10 <10 NS 1.78 2.07 NS NS QO NS 0.61 2.09 1.96 2.06 NS _1%
<br /> MW-325 Intermediate Chromium 12 14 NS 12 81 NS NS <10 NS <10 81 81 91 81 -74%
<br /> Chromium VI <10 <10 NS 6.13 3.55 NS NS <10 NS <0.5 7 7.82 5.57 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(WOO)
<br /> J=Estimated laboratory value
<br /> µg/L=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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