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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 1 of 4
<br /> Total Chromium and Chromium VI(pg/L)
<br /> Monitoring Well Screened Water- Chemical Name South Yard Baseline 2nd Qtr and 2nd Qtr and 2nd Qtr and
<br /> Location bearing Zone Background Event North Yard Baseline Supplemental (May 3rd Qtr and 4th Qtr and Compliance Supplemental 1st Qtr and Compliance 3rd Qtr and 4th Qtr and Compliance 1st Qtr and Compliance
<br /> g (**)and 2nd Qtr Compliance Compliance(April Compliance(April
<br /> (2008) Event(2008) Event 2008 (April 2008) 2008) Compliance(July 2008) (October 2008) (November 2008) (January 2009) 2009) Compliance(July 2009) (October 2009) (February 2010) 2010)
<br /> MW-6 Shallow Chromium NS NS NS <10 30 <10
<br /> Chromium VI NS NS NS NS NS <10 <10 QO QO QO QO QO QO QO
<br /> MW-8 Shallow Chromium N 5 N N QO 87 N 134 134 228 234 221
<br /> Chromium VI NS 700 <10 NS NS <10 80 NS 110 140 140 160 230 200
<br /> MW-9 Shallow Chromium NS NS 21J** NS NS 13 14 NS 26 <10 <10 17 33 23
<br /> Chromium VI NS NS 10** NS NS <10 <10 NS <10 <10 <10 <10 <10 <10
<br /> Chromium NS 850J 1,400 NS NS 1,200 666 NS 50 <10 <10 10 29J 18
<br /> MW-101 Shallow Chromium VI NS 800 1,400 NS NS 1,200 700 NS <10 <10 <10 <10 <10 <10
<br /> MW-102 Shallow Chromium NS 1,000 815 NS NS 240 83 NS 155 212 212 168 132 106
<br /> Chromium VI NS 1,000 810 NS NS 230 100 NS 100 230 230 180 110 100
<br /> Chromium NS 2,500 1,130 NS <10 <10 18 NS 64 15 15 18 20 5
<br /> MW-104(S-2) Shallow Chromium VI NS 2,300 500 NS <10 <10 <10 NS <10 <10 <10 <10 <10 <10
<br /> MW-105 Shallow Chromium NS 218 795 NS NS 70 QO NS 23 QO QO 18 18 16
<br /> Chromium VI NS 200 200J NS NS 70 <10 NS <10 <10 <10 <10 <10 <IOUJ
<br /> MW-106 Shallow Chromium NS 500 92 NS NS 132 116 NS 121 158 158 25 30 9
<br /> Chromium VI NS 500 90 NS NS 130 100 NS 120 170 170 30 QO QO
<br /> MW-204(S-8) Shallow Chromium NS 3,090 NS NS 3,140 3,040 2,850 NS 2,800 2,750 2,750 2,120 2,120 2,120
<br /> Chromium VI NS 3,000 NS NS 3,190 3,000 2,800 NS 2,770 2,450 2,450 2,160 1,780 1,950
<br /> MW-205(S-7) Shallow Chromium NS 570 NS NS NS 186 340 NS 682 381 381 520 659 662
<br /> Chromium VI NS 500 NS NS NS 180 400 NS 680 370 370 540 620 530
<br /> MW-206 Shallow Chromium NS NS NS NS NS 3,300 24,000 21,800 21,600 14,800 14,800 12,700 21,400 11,200
<br /> Chromium VI NS NS NS NS NS 3,240 25,100 21,400 21,300 12,800 12,800 13,600 20,000 9,900
<br /> MW-207 Shallow Chromium NS 20 32 NS NS 35 49 NS 60 58 58 41 44 58
<br /> Chromium VI NS 20 30 NS NS 30 40 NS 40 60 60 40 50 60
<br /> Chromium NS 180 186 NS 114 114 73J NS 40 <10 <10 19 30 22
<br /> MW-208 Shallow Chromium VI NS 100 180 NS 120 110 70J NS <10 <10 <10 <10 <10 <10
<br /> MW-300 Shallow Chromium NS <10 24 NS NS 15 21 NS 42J 14 14 30 30 15
<br /> Chromium VI NS <10 10 NS NS <10 10 NS <10 20 20 <10 <10 10
<br /> MW-301 Shallow Chromium NS NS 108 NS NS 100 86 NS 97 90 90 91 88 125
<br /> Chromium VI NS NS 100 NS NS 90 80 NS 50 90 90 120 80 120
<br /> MW-303 Shallow Chromium NS NS 94** NS 88 <10 62 NS 89 47 47 6 37 27J
<br /> Chromium VI NS NS 90** NS 70 <10 30 NS 40 30 30 QO <10 <10
<br /> Chromium NS <10 12 NS NS 13 12 NS 13 <10 <10 19 34 14
<br /> TW-12 Shallow Chromium VI NS QO <10 NS NS 10 <10 NS <10 <10 <10 <10 <10 <IOUJ
<br /> TW-14 Shallow Chromium NS NS 16** NS NS 27 12 NS 86 <10 <10 10 25 37
<br /> Chromium VI NS NS 10** NS NS <10 <10 NS <10 <10 <10 <10 <10 <10
<br /> TW-17 Shallow Chromium NS NS 15** NS NS 46 83 NS 204 2727 <10 <10Chromium VI NS NS <10** NS NS <10 <10 NS <10 <10 <10 <10 <10 <10
<br /> Chromium NS 150* NS NS NS <10 12 NS 37 <10 <10 16 29 24
<br /> EW-1 Shallow/Intermediate Chromium VI NS 150* NS NS <0.50R <IOUJ <10 NS <10 <10 <10 <10 <10 <10
<br /> TW-13 100-Foot Sand Chromium NS 8,500 2,420 NS NS 980 4,360 1,720 2,080 2,460 2,460 1,800 1,340 1,010
<br /> Chromium VI NS 8,500 2,420 NS NS 950 4,200 1,700 1,960 2,030 2,030 1,850 1,230 880
<br /> Chromium NS NS 76** NS NS 63 94 NS 104J <10 <10 5 4 11
<br /> TW-15 100-Foot Sand Chromium VI NS NS 70J** NS NS <10 100 NS 80 <10 <10 <10 <10 <10
<br /> TW-16 100-Foot Sand Chromium NS NS 1080** NS NS 19 45 NS 69 <10 <10 4 13 18
<br /> Chromium VI NS NS 1000** NS NS QO <10 NS QO QO QO QO QO QO
<br /> Chromium NS NS NS NS 481 200 110 NS 112 90 90 76 68 72
<br /> I-11 Intermediate Chromium VI NS NS NS NS 470 200 100 NS 100 100 100 90 80 70
<br /> Chromium NS <10 10 NS NS <10 <10 NS 17 <10 <10 6 18 14
<br /> MW-1 Intermediate Chromium VI NS QO <10 NS NS QO <10 NS QO QO QO QO QO 10J
<br /> Chromium NS 39 42 NS NS 37 <10 NS 47 16 16 4 4 35
<br /> MW-2 Intermediate Chromium VI NS 30 40 NS NS 30 <10 NS 40 20 20 <10 <10 40
<br /> Chromium NS 4,600 7,220 NS 3,960 3,960 3,860 NS 4,030 3,840 3,840 3,200 3,480 3,040
<br /> MW-213(I-7) Intermediate Chromium VI NS 4,600 7,200 NS 4,140 3,900 3,640 NS 4,020 3,190 3,190 3,410 2,960 2,720
<br /> Chromium NS NS NS NS NS 680 665 NS 758 734 734 720 718 716
<br /> MW-214(I-8) Intermediate Chromium VI NS NS NS NS NS 680 700 NS 720 350 350 750 690 670
<br /> Chromium NS NS NS NS 33 NS NS NS NS NS NS NS NS NS
<br /> MW-320 Intermediate Chromium VI NS NS NS NS 40 NS NS NS NS NS NS NS NS NS
<br /> Chromium NS NS 380J** NS 372J 730 860 818 789 604 604 340 418 430
<br /> MW-321(I-9) Intermediate Chromium VI NS NS 380** NS 380J 700 900 800 740 580 580 390 370 360
<br /> Chromium NS NS 11** NS NS 23 <10 NS 38 14 14 45 63 58
<br /> MW-322 Intermediate Chromium VI NS NS <10** NS NS <10 <10 NS 10 <10 <10 30 50 60
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