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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 1 of 4
<br /> Total Chromium and Chromium VI(pg(L)
<br /> Monitoring Well Screened Water- Chemical Name South Yard Baseline 2nd Q[r and 4th Qtr and 1st Qtr and 2nd Qtr and 4th Qtr and ls[Qtr and 2nd Qtr and
<br /> Location bearing Zone Background Event North Yard Baseline Supplemental (May 3rd Qtr and Supplemental 3rd Qtr and 3rd Qtr and
<br /> g (**) ad 2nd Qtr Compliance Compliance(October Compliance(January Compliance(April Compliance(October Compliance(February Compliance(April
<br /> (2008) Event(2008) Event(2008) (April 2008) 2008) Compliance(July 2008) 2008) (November 2008) 2009) 2009) Compliance(July 2009) 2009) 2010) 2010) Compliance(July 2010)
<br /> MW-6 Shallow Chromium NS NS NS NS NS QO 30 49J 93 16 16 21 23 <10 20
<br /> Chromium Vi NS NS NS NS NS <10 <10 <10 <10 <10 <10 <10 <10 <10 <10
<br /> MW-8 Shallow Chromium NS 760 15 NS NS <10 87 NS 119 134 134 228 234 221 102
<br /> Chromium VI NS 7 <10 NS NS <10 80 NS 110 140 140 160 230 200 100
<br /> MW-9 Shallow Chromium NS NS 21J** NS NS 13 14 NS 26 QO <10 17 33 23 14
<br /> Chromium Vi NS NS 10** NS NS <10 <10 NS <10 <10 <10 <10 <10 <10 <10
<br /> MW-101 Shallow Chromium NS 850J 1,400 NS NS 1,200 666 NS 50 <10 <10 10 29J 18 23
<br /> Chromium VI NS 800 1,400 NS NS 1,200 700 NS <10 <10 <10 <10 <10 <10 20
<br /> MW-102 Shallow Chromium NS 11000 815 NS NS 240 83 NS 155 212 212 168 132 106 750
<br /> Chromium VI NS 1,000 810 NS NS 230 100 NS 100 230 230 180 110 100 670
<br /> MW-104(S-2) Shallow Chromium NS 2,500 11130 NS <10 <10 18 NS 64 15 15 18 20 5 26
<br /> Chromium VI NS 2,300 500 NS <10 <10 <10 NS <10 <10 <10 <10 <10 <10 10
<br /> MW-105 Shallow Chromium NS 218 795 NS NS 70 <10 NS 23 <10 <10 18 18 16 8
<br /> Chromium VI NS 200 200J NS NS 70 <10 NS <10 <10 <10 <10 <10 <IOUJ <10
<br /> MW-106 Shallow Chromium NS 500 92 NS NS 132 116 NS 121 158 158 25 30 9 192
<br /> Chromium VI NS 500 90 NS NS 130 100 NS 120 170 170 30 <10 <10 190
<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 2,860
<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 2,470
<br /> MW-205(S-7) Shallow Chromium NS 570 NS NS NS 186 340 NS 682 381 381 520 659 662 704
<br /> Chromium VI NS 500 NS NS NS 180 400 NS 680 370 370 540 620 530 560
<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 32,100
<br /> Chromium V1 NS NS NS NS NS 3,240 25,100 21,400 21,300 12,800 12,800 13,600 20,000 9,900 29,400
<br /> MW-207 Shallow Chromium NS 20 32 NS NS 35 49 NS 60 58 58 41 44 58 152
<br /> Chromium VI NS 20 30 NS NS 30 40 NS 40 60 60 40 50 60 150
<br /> MW-208 Shallow Chromium NS 180 186 NS 114 114 73J NS 40 <10 <10 19 30 22 18
<br /> Chromium VI NS 100 180 NS 120 110 70J NS <10 <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 24
<br /> Chromium VI NS <10 10 NS NS <10 10 NS <10 20 20 <10 <10 10 <10
<br /> MW-301 Shallow Chromium NS NS 108 NS NS 100 86 NS 97 90 90 91 88 125 130
<br /> Chromium VI NS NS 100 NS NS 90 80 NS 50 90 90 120 80 120 120
<br /> MW-303 Shallow Chromium NS NS 94** NS 88 <10 62 NS 89 47 47 6 37 27J 22
<br /> Chromium VI NS NS 90** NS 70 <10 30 NS 40 30 30 <10 <10 <10 <10
<br /> TW-12 Shallow Chromium NS <10 12 NS NS 13 12 NS 13 <10 <10 19 34 14 17
<br /> Chromium VI NS <10 <10 NS NS 10 <10 NS <10 <10 <10 <10 <10 <101-JJ <10
<br /> TW-14 Shallow Chromium NS NS 16** NS NS 27 12 NS 86 <10 <10 10 25 37 15
<br /> Chromium VI NS NS 10** NS NS <10 <10 NS <10 <10 <10 <10 <10 <10 <10
<br /> TW-17 Shallow Chromium NS NS 15** NS NS 46 83 NS 204 27 27 7 <10 <10 25
<br /> Chromium VI NS NS <10** NS NS <10 <10 NS <10 <10 <10 <10 <10 <10 <10
<br /> EW-1 Shallow/Intermediate Chromium NS 150* NS NS NS <10 12 NS 37 <10 <10 16 29 24 11
<br /> Chromium VI NS 150* NS NS <0.50R <IOUJ <10 NS <10 <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 11010 9
<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 <10
<br /> TW-15 100-Foot Sand Chromium NS NS 76** NS NS 63 94 NS 104J <10 <10 5 4 11 17
<br /> Chromium VI NS NS 70J** NS NS <10 100 NS 80 <10 <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 10
<br /> Chromium VI NS NS 1000*' NS NS <10 <10 NS <10 <10 <10 <10 <10 <10 <10
<br /> 1-I1 Intermediate Chromium NS NS NS NS 481 200 110 NS 112 90 90 76 68 72 67
<br /> Chromium VI NS NS NS NS 470 200 100 NS 100 100 100 90 80 70 60
<br /> MW-1 Intermediate Chromium NS <10 10 NS NS <10 <10 NS 17 <10 <10 <IO <IO IOJ <10
<br /> Chromium VI NS <10 <10 NS NS <10 <10 NS <10
<br /> MW-2 Intermediate Chromium NS 39 42 NS NS 37 <10 NS 47 16 16 4 4 35 17
<br /> Chromium VI NS 30 40 NS NS 30 <10 NS 40 20 20 <10 <10 40 <10
<br /> MW-213(1-7) Intermediate 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 2,900
<br /> 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 2,740
<br /> MW-214(1-8) Intermediate Chromium NS NS NS NS NS 680 665 NS 758 734 734 720 718 716 662
<br /> Chromium VI NS NS NS NS NS 680 700 NS 720 350 350 750 690 670 610
<br /> MW-320 Intermediate Chromium NS NS NS NS 33 NS NS NS NS NS NS NS NS NS NS
<br /> Chromium VI NS NS NS NS 40 NS NS NS NS NS NS NS NS NS NS
<br /> MW-321(1-9) Intermediate Chromium NS NS 380J** NS 372J 730 860 818 789 604 604 340 418 430 598
<br /> Chromium VI NS NS 380*• NS 380J 700 900 800 740 580 580 390 370 360 520
<br /> MW-322 Intermediate Chromium NS NS 11** NS NS 23 <10 NS 38 14 14 45 63 58 44
<br /> Chromium Vl NS NS <]().* NS NS <10 <10 NS 10 <10 <10 30 50 60 40
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