ARCHIVED REPORTS_2011 REVISED FEASABILITY STUDY

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TABLE B.4-6 amec Quantitative Assessment of Intrinsic Remediation Using CSIA Downgradient Total Total Total Distance from TCE cDCE Vinyl Chloride Total COCs TCE TCE COCs COCs trans- WeII ID (feet) Date um µg/L S13C uM µg/L 813C um µg/L S13C CuOMs S13Cbulk f formed f removed TH-10 350 04/26/10 0.36 47 -20.3 1.44 140 -23.9 2.72 170 -37.4 4.52 -31.7 0.08 92% 1.01 0% TH-10 350 08/03/10 0.32 42 -20.6 1.24 120 -23.8 2.08 130 -38.5 3.64 -31.9 0.08 92% 1.05 0% M-20C1 500 04/26/10 0.04 5.7 -19.4 0.14 14 -18.7 0.26 16 -34.8 0.44 -28.1 0.07 93% 0.45 55% M-31 C1 750 04/27/10 0.40 53 -21.9 2.47 240 -25.6 1.14 71 -39.9 4.01 -29.3 0.11 89% 0.58 42% M-31 C1 750 08/03/10 0.38 50 -21.2 2.27 220 -25.4 0.91 57 -40.6 3.56 -28.8 0.10 90% 0.53 47% M-17C1 1750 04/27/10 0.10 13 -15.7 0.42 41 -13.0 0.66 41 -29.5 1.18 -22.4 0.03 97% 0.13 87% M-17C1 1750 08/03/10 0.08 11 -15.4 0.41 40 -14.0 0.48 30 -30.5 0.98 -22.2 0.03 97% 0.12 88% M-6A 3500 04/26/10 0.55 72 -23.8 0.16 16 -14.8 0.01 0.90 ND 0.73 -21.7 0.17 83% 0.11 89% M-6A 3500 08/02/10 0.49 65 -23.7 0.13 13 -15.2 0.01 0.62 ND 0.64 -21.9 0.17 83% 0.11 89% M-6C1 3500 04/26/10 1.37 180 -24.1 0.42 41 -16.1 0.01 0.55 ND 1.80 -22.2 0.18 82% 0.12 88% M-6C1 3500 08/02/10 0.99 130 -22.7 0.39 38 -15.9 0.01 0.89 ND 1.40 -20.8 0.14 86% 0.09 91% M-6C2 3500 04/26/10 0.41 54 -16.0 0.77 75 -8.8 ND <0.50 ND 1.18 -11.3 0.03 97% 0.01 99% M-6C2 3500 08/02/10 0.34 45 -16.2 0.72 70 -8.7 ND <1.0 ND 1.06 -11.1 0.03 97% 0.01 99% M-49A 3500 08/02/10 0.99 130 -23.6 ND <1.0 ND ND <1.0 ND 0.99 -23.6 0.17 83% 0.17 83% M-25C1 3750 04/26/10 0.11 15 -22.8 0.10 9.3 -16.5 ND <0.50 ND 0.21 -19.9 0.14 86% 0.07 93% M-25C2 3750 04/26/10 0.05 6.4 -20.7 0.19 18 -15.8 ND <0.50 ND 0.23 -16.8 0.09 91% 0.04 96% M-113 3900 08/03/10 1.07 140 -21.7 ND <1.0 ND ND <1.0 ND 1.07 -21.7 0.11 89% 0.11 89% EU-3 3900 04/26/10 0.24 31 -26.7 ND <1.0 ND ND <0.50 ND 0.24 -26.7 0.33 67% 0.33 67% EW-1 3900 08/03/10 0.58 76 -24.4 0.06 6 ND ND <1.0 ND 0.58 -24.4 0.20 80% 0.20 80% M-10A DUP 4250 04/26/10 1.90 250 -25.0 0.06 5.6 -17.8 ND <1.0 ND 1.96 -24.8 0.23 77% 0.22 78% M-10A 4250 08/03/10 2.36 310 -25.3 0.06 5.8 ND ND <1.0 ND 2.42 -25.3 0.24 76% 0.24 76% M-10C1 4250 04/27/10 0.06 8.5 -4.3 0.03 3.0 ND ND <0.50 ND 0.10 -4.3 0.00 99.8% 0.00 99.8% Abbreviations TCE=trichloroethene cDCE=cis-dichloroethene d13C=stable carbon isotope ratio in permill relative to VPDB, COCs=TCE+cDCE+vinyl chloride 8"C = stable carbon isotope ration in permill relative to VPDB uM=concentration in micromoles per liter, CDCs=TCE+cDCE+vinyl chloride f=fraction of COC remaining after degradation; DUP=duplicate sample 613Cbulk=[X TCE(613CTCE)+Y CDCE(613CDCE)+ Z vinyl Chloride (613CVC)]/[X + Y + Z] x=uM TCE; y=uM cDCE; z=uM vinyl chloride TCE f=exp[(813CTCE+31.8))/-4.5] TCE f=exp[(613Cb,,1k-(-31.8))/-4.5]