Sequenced Permeable Reactive Barrier for the Pretreatment of Nitrate and Remediation of Trichloroethene - Permeable Reactive Barrier: Sustainable Groundwater Remediation - page 130

0.3

0.25

Jul-10
Nov-10
Feb-11
Jun-11
Dec-11
Mar-12
Jun-12
Sep-12

0.2

0.15

0.1

0.05

0

MWG107B
Upgradient

MWG101B
Denit. PRB

MWG112B
between

MWG104B
ZVI PRB

MWG110B
Downgradient

Monitoring well

FIGURE 7.15
VC concentrations along cross-section C-C′ for B series monitoring wells.

18

16

Jul-10
Nov-10
Mar-11
Jun-11
Dec-11
Mar-12
Jun-12
Sep-12

14

12
10

8

6
4

2
0

MWG107
Upgradient

MWG101
Denit. PRB

MWG112
between

MWG104
ZVI PRB

MWG110
Downgradient

Monitoring location

FIGURE 7.16
Total molar mass of chlorinated ethenes at each location along cross-section C-C′.

attempt to resolve this issue, two multilevel monitoring wells were installed in
the ZVI PRB in June 2011. Subsequent monitoring results have confirmed the
absence of chlorinated ethenes within the ZVI PRB.
To assess the effectiveness of the PRBs in reducing nitrate and remedi-
ating chlorinated ethenes, a comparison between the up- and downgradi-
ent monitoring data has been made (i.e., MWG107 with MWG112 for the