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TABLE 7 TOTAL AND HEXAVALENT CHROMIUM RESULTS EVALUATION 2012 ANNUAL GROUNDWATER MONITORING REPORT FORMER MARLEY COOLING TOWER SITE STOCKTON,CALIFORNIA Page 3 of 4 Total Chromium and Chromium VI(µg/L) Percent Change in Monitoring Well Screened Water- Chemical Name 4th Qtr Supplemental Concentration from 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 Compliance(July 2010) (October 2010) 2010) (January 2011) (April 201 1) 2011) 2011) (July 2011) 2011) (October 2011) (January 2012) (April 2012) (July 2012) (October 2012) Maximum*** Chromium < - o MW-6 Shallow Chromium VI QO 190 NS <0.5 <0.5 NS NS QO NS <0.5 <0.5 <0.5 <0.5 <0.5 -100% MW-8 Shallow Chromium 102 142 N N N N -74% Chromium VI 100 140 NS 127 384 NS NS 380 NS 307 254 519 388 195 -72% Chromium 14 14 NS 91 6J NS NS 81 NS <10 <10 5J 3.1 6J - MW-9 Shallow Chromium VI <10 <10 NS <0.5 <0.5 NS NS <10 NS <0.5 <0.5 <0.5 <0.5 <0.5 NM MW-101 Shallow Chromium 23 13 NS 10 7J NS NS 4J NS 3J 10 5J 3J 4J -100% Chromium VI 20 <10 NS <0.5 <0.5 NS NS <10 NS <0.5 4.52 <0.5 <0.5 <0.5 -100% Chromium 750 1,200 NS 1,180 1,080 NS NS NS 1050 825 620 615 503 570 -53% MW-102 Shallow Chromium VI 670 980 NS 1,080 1,030 NS NS NS 988 825 608 600 503 568 -47% MW-104(S-2) Shallow Chromium 26 77 NS 68 46 NS NS NS 5J <10 5J <10 7J 4J -100% Chromium VI 10 <10 NS <0.5 <0.5 NS NS NS <0.2 <0.5 <0.5 <0.5 <0.5 <0.5 -100% MW-105 Shallow Chromium 8 25 NS 7 11 NS NS 6J NS 8.1 12 4.1 J <10 -100% Chromium VI <10 <10 NS 5 <0.5 NS NS <10 NS <0.5 <0.5 <0.5 5 <0.5 -100% Chromium 192 143 NS 135 272 NS NS 260 NS 157 230 232 143 155 -69% MW-106 Shallow Chromium VI 190 140 NS 134 270 NS NS 260 NS 157 228 225 139 154 -69% -mr Chromimn 2,860 4,380 NS 3,250 2,750 NS S 634 2,030 2,200 500 NS 390 346 -92% MW-204(S-8) Shallow Chromium VI 2,470 3,630 NS 2,890 2,620 NS NS 480 2,020 2,190 497 NS 331 322 -91% Chromium 704 714 NS 468 540 NS NS 283 530 450 290 363 380 340 -52% MW-205(S-7) Shallow Chromium VI 560 580 NS 464 523 NS NS 230 503 450 282 342 355 331 -51% Chromium 32,100 122 133 10 13 NS NS 6J NS <10 3J 6J 6J 51 -100% MW-206 Shallow Chromium VI 29,400 QO <10 <0.5 <0.5 NS NS <10 NS <0.5 <0.5 <0.5 NS NS -100% Chromium 152 72 NS 49 53 NS NS 28 NS 29 95 58 27 50 -67% MW-207 Shallow Chromium VI 150 70 NS 46.1 52.2 NS NS 20 NS 28.8 34.8 56.3 25.4 48.2 -68% Chromium 18 20 NS 8J 13 NS NS 3J NS <10 6J <10 3J <10 -100% MW-208 Shallow Chromium VI <10 20 NS <0.5 <0.5 NS NS <10 NS <0.5 <0.5 <0.5 <0.5 <0.5 -100% Chromium 24 16 NS 16 20 NS NS 13 NS 10 29 12 15 11 -63% MW-300 Shallow Chromium VI <10 <10 NS 9.63 10.5 NS NS 10 NS 9.94 11.1 9.73 9.54 10.5 -48% Chromium 130 144 NS 100 90 NS NS 100 NS 135 195 63 49 24 -88% MW-301 Shallow Chromium VI 120 140 NS 98.2 89.5 NS ANS 100 NS 135 110 59.6 42.7 23.2 -83% MW-303 Shallow Chromium 22 18 NS 23 12 NS NS D NS 5J M 5J 5J M -97% Chromium VI <10 <10 NS <0.5 <0.5 NS NS <10 NS <0.5 <0.5 <0.5 <0.5 <0.5 -100% TW-12 Shallow Chromium 17 16 NS 12 14 NS 91 NS 3.1 QO 6.1 3.1 4J -88% Chromium VI QO <10 NS <0.5 <0.5 NS <10 NS <0.5 <0.5 <0.5 <0.5 <0.5 -100% TW-14 Shallow Chromium 15 11 NS 11 14 NS NS 91 NS <10 NS NS 6J M -97% Chromium VI <10 <10 NS <0.5 <0.5 NS NS <10 NS <0.5 NS NS <0.5 <0.5 NM Chromium 25 18 NS 91 12 NS S 3J NS <10 <10 <10 3J 3J -99% TW-17 Shallow Chromium VI <10 <10 NS 0.2UJ <0.5 NS NS <10 NS <0.5 <0.5 <0.5 <0.5 <0.5 NM Chromium 11 14 NS 11 6J NS NS 4J NS <10 M <10 <10 <10 -100% EW-1 Shallow/Intermediate Chromium VI <10 <10 NS <0.5 <0.5 NS NS <10 NS <0.5 <0.5 <0.5 <0.5 <0.5 NM TW-13 100-Foot Sand Chromium 9 9 9 10 91 NS NS 14 NS 3J 3J 6J 12 262 -97% Chromium VI QO QO <10 <0.5 <0.5 NS NS <10 NS <0.5 <0.5 <0.5 <0.5 254 -97% Chromium 17 41 6 <10 4J NS NS 4J NS 16 NS 24 43 37 -61% TW-15 100-Foot Sand Chromium VI <10 20 <10 0.38J <0.5 NS NS <10 NS 15.8 NS 20.6 39.2 36.8 -63% TW-16 100-Foot Sand Chromium 10 5 5 7J 7J NS NS 4J NS <10 <10 4J 3J 4J -94% Chromium VI QO QO <10 <0.5 <0.5 NS NS <10 NS <0.5 <0.5 <0.5 <0.5 <0.5 NM Chromium 67 60 55 56 80 126 184 196 367 368 450 510 440 305 -40% I-11 Intermediate Chromium VI 60 60 54.3 56.3 79.8 120 180 190 343 367 441 507 438 303 -40% Chromium 11 11 NS <10 6J NS NS 5J NS 3J 4J 3J 5J 6 -67% MW-1 Intermediate Chromium VI QO <10 NS 0.64 3 NS S <10 NS 2.5 2.71 1.42 2.29 NS -24% Chromium 17 30 NS 25 17 NS NS 16 NS 19 20 16 20 20 -57% MW-2 Intermediate Chromium VI <10 30 NS 25.3 15.1 NS NS 10 NS 19.4 19.8 15.9 18.0 19.0 -53% Chromium 2,900 2,590 NS 5 6J NS S 125 1,390 1,290 <10 5,410 670 2,880 -60% MW-213(I-7) Intermediate Chromium VI 2,740 1,970 NS <0.5 <0.5 NS NS 110 1,320 1,220 <0.5 5,120 561 2,710 -62% Chromium 662 11 NS D D NS NS <10 NS <10 4J <10 4J <10 -100% MW-214(I-8) Intermediate Chromium VI 610 <10 NS <0.5 <0.5 NS NS <10 NS <0.5 <0.5 <0.5 <0.5 <0.5 -100% Chromium NS NS NS NS 7J NS NS 5 NS K 5J 11 <10 <10 -100% MW-320 Intermediate Chromium VI NS NS NS NS 3.96 NS NS <10 NS 2.6 4.08 10.9 <0.5 <0.5 -100% Chromium 598 760 474 536 406 140 142 149 136 158 120 4J 150 57 -93% MW-321(I-9) Intermediate Chromium VI 520 620 447 517 353 140 150 150 130 158 116 0.43J 149 49.5 -95% Chromium 44 32 26 27 30 NS NS 22 NS 7J 16 20 24 15 -76% MW-322 Internediate Chromium VI 40 20 20.8 22.1 22.8 NS NS 10 NS 6.9 15.7 17.4 23.4 14.9 -75%