Moss Point, Mississippi

Moss Point, Mississippi

Moss Point, Mississippi

Site Location:
Moss Point, MS — 2017-2019

Contaminants:
The select primary contaminants of concern (COCs) in the groundwater at the site include [1,2-Dichloroethane, 2-Chloroethanol, 1,4-Dioxane, bis(2-Chloroethoxy)methane, and bis(2-Chloroethyl)ether].

Project Objective:
To evaluate the potential for utilizing phytoremediation to contain the potential off-site flow of COC contaminants in the groundwater through hydraulic control and containment of groundwater (or leachate).

Implementation:
The TreeMediation implementation consisted of 65 TreeWell units which were installed in November, 2017 at approximately 25 feet below ground surface. Root cameras were installed in four of the units to monitor the root systems of each species of tree. Eight piezometers were installed within individual TreeWell units. In January, 2018, willow trees were planted in each unit.

Results to Date:
In the first growing season (2018), tree growth and viability were observed to be “very good” for the entire TreeWell study. The tree health assessments do not show any significant indicators of plant stress. The height and canopy of most of the trees in the TreeWell units have continued to increase. Trees are displaying vigorous growth and, based on hydrogeologic monitoring data, are providing hydraulic capture. Preliminary hydrogeologic data suggest they are on track to perform as designed.