Remediation of the Plant Area Continues
The former HoltraChem manufacturing facility was constructed in 1967 for the purpose of manufacturing chlorine and sodium hydroxide for use in the pulp and paper industry in Maine. Other products were also produced at the plant over the years before it ceased operation 2000.
The Plant Area at the Site is approximately 12 acres on which the former manufacturing processes took place. This area included numerous buildings and related infrastructure such as storage tanks and associated piping. The former “Cell Building” was where the majority of manufacturing operations occurred, although there were (with the exception of the new water treatment plant) other buildings for various ancillary production processes, maintenance and materials storage. All of the remaining tanks and piping will be demolished upon final completion of the remediation and restoration at the Site.
The soils in and around the plant area have been investigated and some have been impacted by prior facility operations.
The original Corrective Measures Implementation Plan (CMIP) for the Plant Area was submitted in early 2017. Based on subsequent discussions between the Maine DEP and Mallinckrodt, the remediation of the Plant Area has been separated into different phases of work. The Phase 1 design was submitted to the DEP in December 2017 and involves excavating impacted soils above the MPS and transporting offsite to a secure landfill. DEP approved Phase 1 in January 2018 and the removal of impacted soils was completed in early 2019. Final backfill was completed in early summer 2019 and final restoration will be completed in 2019. Technical discussions were held with DEP in December 2018 and design plans for the Phase 2 approach were approved by Maine DEP in September 2019. Phase 2 work will continue into 2020.