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HomeMy WebLinkAboutBarnstable County_PRB slide presentation_5.14.2025 jrpNotice of Intent Barnstable Conservation Commission Former Municipal Fire Training Facility (MFTF) Permeable Reactive Barrier (PRB) Installation Project BARNSTABLE COUNTY REGIONAL GOVERNMENT OF CAPE COD PRESENTED BY GZA GEOENVIRONMENTAL, INC. 3:00PM MAY 13, 2025 Site Locus 2 •155 South Flint Rock Road, Hyannis, MA Former Municipal Fire Training Facility History 3 •1959 to 1983 owned by others and operated by Hyannis Fire Department. •1987 to 2019 made available to towns by the County. •Utilized by all Cape Cod Fire Departments for critical and necessary life-saving training exercises. •The Towns participated in education and essential training that they otherwise could not afford. •Trained with AFFF (aqueous film forming foams) from 1959-2009, provided by individual Fire Departments (i.e., the County did not purchase foam and has no Site usage records). •Water training exercises ceased in 2019. Shallow Groundwater Contour Plan June 2024 PFAS6 Sum Concentrations (ng/L) Shallow Groundwater June 2024 Site History 6 •Public water supply wells impacted by PFAS •Hot spot soil removed (200 tons of soil) •Site capped •Groundwater treatment system in operation •PRB Pilot Test ongoing Interested Parties •Massachusetts Department of Environmental Protection; •Hyannis Airport; •Barnstable Fire District (BFD); •United States Geological Survey (USGS). •Hyannis Water District; •Town of Yarmouth; •Local Neighborhood Groups Project Purpose and Need PFOS •PRB proposed to mitigate migration of PFAS •Nearby public water supply wells (10 seasonal/full-time) •Immediate Response Action under the MCP •PRB using Colloidal Activated Carbon injections •Reason for NOI – Portions of PRB are within regulated wetland Buffer Zones Wetland Resource Areas •Flintrock Pond - Bank •Isolated Vegetated Wetland •PVP •100-Foot Buffer Zone (WPA and Barnstable CC) •50-Foot Buffer Zone (Barnstable CC) •NHESP Priority Habitat 10 Proposed Project •Permeable Reactive Barrier (PRB) using In-situ Colloidal Activated Carbon (CAC) Treatment •Involves injecting activated carbon into the subsurface (Similar to Hyannis treatment system) •Contaminants sorb to the activated carbon and adhere to the soil •Effectively creates an in-situ vertical treatment wall •Mitigates further downgradient contaminant migration Limited Impacts •Work within 50 and 100-Foot Buffer Zones •Access from within existing fence line •No tree removal •No above ground construction •Project Sequence •Mobilize Summer 2025 •Install Erosion and Sediment Controls •Install PRB outside Buffer Zones (< 500 linear feet) •Install PRB within Buffer Zones (< 150 linear feet) Discussion & Questions David E. Leone, LSP Principal, LSP-of-Record GZA GeoEnvironmental, Inc. DavidE.Leone@gza.com John Paquin, P.G. Principal, Project Coordinator GZA GeoEnvironmental, Inc. john.paquin@gza.com Thank You! Paul Ruszala, P.E. Barnstable County Assets and Infrastructure Manager paul.ruszala@capecod.gov Michael Dutton County Administrator Michael.Dutton@capecod.gov