Project Timeline

Site-specific studies addressing various aspects of the Grasse River have been conducted throughout the course of the remediation project. These studies have yielded significant data that will be used to determine the best way to remediate the river. Major projects include:

  • Land-Based Remediation Activities - a comprehensive program on the Arconic (formerly Alcoa) West plant site to eliminate and minimize the discharge of contaminants to the Grasse River.
  • 1995 Non-Time-Critical Removal Action - a pilot project in which PCB-containing sediments were removed from a small area of the Grasse River.
  • 2001 Capping Pilot Study - a trial of various capping techniques.
  • 2005 Remedial Options Pilot Study - a combination trial of capping and sediment removal techniques.
  • 2006 Activated Carbon Pilot Study - to evaluate the effectiveness of applying and mixing activated carbon in sediments of the lower Grasse River.
  • Ice Management Evaluation - a study to determine the best way to manage ice in the river to prevent bottom scour of contaminated sediments due to an ice jam.
  • 2013 to 2016 - In river studies (pre-design investigations) to define remediation boundaries, look for Threatened and Endangered species that could be impacted by the project, understand geotechnical conditions, and support the development of a habitat reconstruction plan.
  • 2016 - Submittal of the Intermediate Design (60% design) for Agency Review
  • 2017-2018 - Constructed land-based facilities and conduct other support activities in preparation for the future in-river remediation work. These activities included expanding the Secure Landfill on the Arconic Massena West property to safely store dredged material, as well as and construction of a staging area near the Route 131 bridge that will be used to unload sediment from the river and load capping materials onto the river during in-water remediation work. Completed other support activities including remediating select upland areas and the Unnamed Tributary, and performing preliminary capping work in the river to verify construction sequencing.
  • 2019-2020+ - Complete the Final Design. In-river remedial construction activities began in 2019 and and are anticipated to take 3-4 years to complete with work starting in April and continuing through November each year (weather pending).

Click on an event below to read more Project Timeline ROD View a larger image of this timeline. 2010 Near Shore Sampling Ice Management Evaluations 2010 Ecological Risk Assessment Revised Analysis of Alternatives Report Revised Analysis of Alternatives Report 2006 Activated Carbon Pilot Study Ice Management Evaluations 2003 Ice Jam 2001 Capping Pilot Study 2001 CCLGR 1995 NTCRA 1991-2001 Land-based Cleanup Phase I and II RSI Leave this website and visit the EPA website to view the 1989 EPA Administrative Order. Land-based Cleanup Phase I and II RSI Timeline Supplemental Remedial Studies 1993 Risk Assessment Fish Consumption Advisory Supplemental Remedial Studies 2002 Human Health Risk Assessment 2002 Analysis of Alternatives Report 2005 Remedial Options Pilot Study Ice Breaking Demonstration CCLGR Addendum Proposed Plan 2013 Pre-Design Pre-Design Investigations 2017-2018 Staging & Construction 2019-2020+ In-River Construction