Greenfield, MA: Greenfield Remediation Project - Phase I, The Berkshire Gas Company
Geo-Solutions, Inc. was contracted by Berkshire Gas to perform remedial construction at the site of a former Manufactured Gas Plant (MGP) located along the Green River in Greenfield, MA. The barrier wall consists of two technical aspects; construction of the barrier wall for hydraulic containment of impacted groundwater and structural support to allow future remedial excavation of the river bank.
Using the single auger soil mixing method, a barrier wall was installed 658 feet long by installing 4 1/2 foot diameter overlapping columns up to 32 feet bgs.
Approximately half of the wall length has steel beams vertically installed on 4 foot centers to provide structural support for future remedial excavation. In addition, a passive groundwater management system was installed to allow ground water to pass through the barrier wall. Additionally, a passive NAPL separation and recovery system was installed to prevent NAPL from passing through the passive groundwater management system.