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TABLE 7 TOTAL AND HEXAVALENT CHROMIUM RESULTS EVALUATION 2012 SEMIANNUAL GROUNDWATER MONITORING REPORT FORMER MARLEY COOLING TOWER SITE STOCKTON,CALIFORNIA Total Chromium and Chromium VI(pg/L) Percent Change in Monitoring Well Screened Water- 2nd Qtr and 4th Qtr and 4th Qtr Su lemental Chemical Name Q Q Q PP Concentration from Location bearing Zone 3rd Qtr and 1st Qtr Compliance 2nd Qtr Compliance Supplemental(May Supplemental(June 3rd Qtr Compliance Supplemental(August 4th Qtr Compliance 1st Qtr Compliance 2nd Qtr Compliance g Compliance(April Compliance(October Sampling(December Maximum- 2010) Compliance(July 2010) 2010) 2010) (January 2011) (April 2011) 2011) 2011) (July 2011) 2011) (October 2011) (January 2012) (April 2012) Shallow Chromium <10 20 318 NS 14 19 NS 3.1 NS 6J <10 6J -98% MW-6 Chromium VI <10 <10 190 NS <0.5 <0.5 NS <10 NS <0.5 <0.5 <0.5 -100% MW-8 Shallow Chromium 221 102 142 NS 128 385 NS NS 479 NS 320 260 544 -28% Chromium VI 200 100 140 NS 127 384 NS NS 380 NS 307 254 519 -26% MW-9 Shallow Chromium 23 14 NS 91 6J NS NS 8J NS <10 Chromium VI <10 <10 NS <0.5 <0.5 NS NS <10 NS <0.5 MW-101 Shallow Chromium 18 23 13 NS 10 7J NS NS 4J NS 3.1 10 5J -100% Chromium VI <10 20 <10 NS <0.5 <0.5 NS NS <10 NS <0.5 4.52 <0.5 -100% MW-102 Shallow Chromium 106 750 1,200 NS 1,180 1,080 NS NS NS 1050 825 620 615 -49% Chromium VI 100 670 980 NS 1,080 1,030 NS NS NS 988 825 608 600 -44% MW-104(S-2) Shallow Chromium 5 26 77 NS 68 46 NS NS NS 5J <10 5.1 <10 -100% Chromium VI <10 10 <10 NS <0.5 <0.5 NS NS NS <0.2 <0.5 <0.5 <0.5 -100% MW-105 Shallow Chromium 16 8 25 NS 3.1 11 NS NS 6J NS 8J 12 4J -99% Chromium VI <IOUJ <10 <10 NS <0.5 <0.5 NS NS <10 NS <0.5 <0.5 <0.5 -100% MW-106 Shallow Chromium 9 192 143 NS 135 272 NS NS 260 NS 157 230 232 -54% Chromium VI <10 190 140 NS 134 270 NS NS 260 NS 157 228 225 -55% MW-204(S-8) Shallow Chromium 2,120 2,860 4,380 NS 3,250 2,750 NS NS 634 2,030 2,200 500 NS -89% Chromium VI 1,950 2,470 3,630 NS 2,890 2,620 NS NS 480 2,020 2,190 497 NS -86% MW-205(S-7) Shallow Chromium 662 704 714 NS 468 540 NS NS 283 530 450 290 363 -49% Chromium VI 530 560 580 NS 464 523 NS NS 230 503 450 282 342 -50% MW-206 Shallow Chromium 11,200 32,100 122 133 10 11 NS NS 6J NS <10 M 6J -100% Chromium VI 9,900 29,400 <10 <10 <0.5 NS NS <10 NS <0.5 <0.5 <0. -100% MW-207 Shallow Chromium 58 152 72 NS 49 53 NS NS 28 NS 29 95 58 -62% Chromium VI 60 150 70 NS 46.1 52.2 NS NS 20 NS 28.8 34.8 56.3 -62% MW-208 Shallow Chromium 22 20 NS 8J NS NS M NS <10 6J <10 -97% Chromium VI <10 20 NS <0.5 NS NS <10 NS <0.5 <0.5 <0.5 100% MW-300 Shallow Chromium 15 24 16 NS 16 20 NS NS 13 NS 10 29 12 -60% Chromium VI 10 <10 <10 NS 9.63 10.5 NS NS 10 NS 9.94 11.1 9.73 -51% MW-301 Shallow Chromium 125 130 144 NS 100 90 NS NS 100 NS 135 195 6 -68% Chromium VI 120 120 140 NS 98.2 89.5 NS NS 100 NS 135 110 59.6 -57% MW-303 Shallow Chromium 27J 22 18 NS 23 12 NS NS 3.1 NS 51 M 5J -94% Chromium VI <10 <10 <10 NS <0.5 <0.5 NS NS <10 NS <0.5 <0.5 <0.5 -100% TW-12 Shallow Chromium 14 17 16 NS 12 14 NS NS 91 NS M <10 6J -82% Chromium VI <lOUJ <10 <10 NS <0.5 <0.5 NS NS <10 NS <0.5 <0.5 <0.5 -98% TW-14 Shallow Chromium 37 15 11 NS 11 14 NS NS 91 NS <10 NS NS -94% Chromium VI <10 <10 <10 NS <0.5 <0.5 NS NS <10 NS <0.5 NS NS NM TW-17 Shallow Chromium <10 25 18 NS 91 12 NS NS M NS <10 <10 <10 -98% Chromium VI <10 <10 <10 NS 0.2UJ <0.5 NS NS <10 NS <0.5 <0.5 <0.5 NM EW-1 Shallow/Intermediate Chromium 24 11 14 NS l I 6J NS NS 4J NS <10 3.1 <10 -86% Chromium VI <10 <10 <10 NS <0.5 <0.5 NS NS <10 NS <0.5 <0.5 <0.5 NM TW-13 100-Foot Sand Chromium 1,010 9 9 9 10 91 NS NS 14 NS M M 6J -100% Chromium VI 880 <10 <10 <10 <0.5 <0.5 NS NS <10 NS <0.5 <0.5 <0.5 -100% TW-15 100-Foot Sand Chromium 11 17 41 6 <10 4J NS NS 4J NS 16 NS 24 -74% Chromium VI <10 <10 20 <10 0.38J <0.5 NS NS <10 NS 15.8 NS 20.6 -79% TW-16 100-Foot Sand Chromium 18 10 5 5 7J 7J NS NS 4J NS <10 <10 4J -94% Chromium VI <10 <10 <10 <10 <0.5 <0.5 NS NS <10 NS <0.5 <0.5 <0.5 NM I-11 Intermediate Chromium 72 67 60 55 56 80 126 184 196 367 368 450 510 0% Chromium VI 70 60 60 54.3 56.3 79.8 120 180 190 343 367 441 507 0% MW-1 Intermediate Chromium 14 11 NS <10 NS NS 5.1 NS M 4J M -83% Chromium VI 107 - NS 0.64 NS NS <10 NS 2.5 2.71 1.42 -53% MW-2 Intermediate Chromium 35 17 30 NS 25 17 NS NS 16 NS 19 20 16 -66% Chromium VI 40 <10 30 NS 25.3 15.1 NS NS 10 NS 19.4 19.8 15.9 -60% MW-213(I-7) Intermediate Chromium 3,040 2,900 2,590 NS 5J 6J NS NS 125 1,390 1,290 <10 5,410 -25% Chromium VI 2,720 2,740 1,970 NS <0.5 <0.5 NS NS 110 1,320 19220 <0.5 59120 -29% MW-214(1-8) Intermediate Chromium 716 662 11 NS M M NS NS <10 NS <10 4.1 <10 -99% Chromium VI 670 610 <10 NS <0.5 <0.5 NS NS <10 NS <0.5 <0.5 <0.5 -100% MW-320 Intermediate Chromium NS NS NS NS NS 7J NS NS 5 NS M 5J 11 -67% Chromium VI NS NS NS NS NS 3.96 NS NS <10 NS 2.6 4.08 10.9 -73% MW-321(1-9) Intermediate Chromium 430 598 760 474 536 406 140 142 149 136 158 120 41 -100% Chromium VI 360 520 620 447 517353 140 150 150 130 158 116 0.43J -100% MW-322 Intermediate Chromium 58 44 32 26 27 30 NS NS 22 NS 7J 16 20 -68% Chromium VI 1 60 40 1 20 20.8 22.1 22.8 NS NS 10 NS 6.9 15.7 17.4 -71% (Page 3 of 4)