Successful Sediment Remediation Strategies at Contaminated Sites Across the Commonwealth. Mille Garcia-Serrano

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1 Successful Sediment Remediation Strategies at Contaminated Sites Across the Commonwealth Mille Garcia-Serrano Deputy Regional Director MassDEP Environmental Business Council New England Energy Environment Economy

2 Successful Sediment Remediation Strategies at Contaminated Sites Across the Massachusetts Coastline Millie Garcia-Serrano, MPH Deputy Regional Director Bureau Waste Site Cleanup

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4 The Massachusetts Cleanup Program Statute: M.G.L. Chapter 21E (1983) Regulation: 310 CMR Massachusetts Contingency Plan (MCP, 1987) Requirements for notification, assessment, cleanup & closure historic sites & sudden releases OHM Risk-based cleanups / Permanent Solution sought From Command & Control to Semi - Privatized Approach: 3-Legged Stool (1993): Potentially Responsible Parties PRPs (respondents) Licensed Site Pressionals (consultants) MassDEP (overseers)

5 FY07 Notifications (most recent 6-yr period): Where Are They Now Today?

6 Successful Approaches to Sediment Remediation at Sites in Massachusetts Dredging with Sediment Disposal Options Off-site disposal On-site disposal [confined disposal facility (CDF) or confined aquatic disposal (CAD)] Capping / Capping with AUL In-situ Stabilization Today s Featured Sites: Harbor Superfund Site, New Bedford Marine Commerce Facility (South Terminal), New Bedford NSTAR Facility, New Bedford Former Chadwick Mills Lead Facility, Marblehead Former Coal Tar Processing Facility, Everett

7 New Bedford Harbor Superfund Site CERCLA Site listed on NPL Site (1982) Approximately 18,000 acres PCB and metals contaminated sediments / 3 Operable Units play) Record Decision: dredging w/ incineration (1998) Several ROD Modifications (post 1998) through Explanation Significant Differences (ESD) some dredged material disposed in CDF some dredged material transported by rail out state some remainder material to be disposed in CADs State Enhanced Remedy (included in 1998 ROD) less contaminated maintenance/navigational dredge material disposal in CDF or CADs on top Superfund dredge material

8 New Bedford Harbor Superfund Site (cont.) Areas to be dredged Areas that have been dredged

9 New Bedford Harbor Superfund Site (cont.) Hydraulic dredging Mechanical dredging

10 New Bedford Harbor Superfund Site (cont.) Dewatering / water treatment facility

11 New Bedford Harbor Superfund Site (cont.) Dewatered dredge material shipped for f-site disposal via rail Dredge material disposal in shoreline CDF

12 Marine Commerce Facility (South Terminal), New Bedford

13 Marine Commerce Facility (South Terminal), New Bedford (cont.) 1,000 feet new bulkhead needed to sustain loads 4,000 lbs/sq ft Dredge approximately 250,000 cubic yards low-level contaminated sediment placement behind bulkhead (CDF) & in CAD cell Create approx. 28 acres assembly & lay down area Deep dredge draft to 32 ft in front bulkhead Creation environmental & habitat restoration areas

14 Marine Commerce Facility (South Terminal), New Bedford (cont.) CAD cell dredging

15 NSTAR Facility, New Bedford RTN Inner Slip Area Outer Slip Area Remediation Former Manufactured Gas Plant Site

16 NSTAR Facility, New Bedford (cont.) RTN Historic Manufactured Gas Plant (MGP) Site Coal tar impacted sediments resulting in petroleum sheen in Harbor PCB impacted sediments due to proximity Harbor Superfund Site 120 sample locations all but 2 below 50 ppm (TSCA triggered) Major Brownfields and Economic Redevelopment Project EJ area / Economic Target Area Remedial Goal: Achieve a Permanent Solution (Dredge, Cap, AUL) installed sheet pile cut-f wall at end Inner Slip limited dredging Outer Slip sediments - placed in Inner Slip in-situ solidification Inner Slip sediments Cap & Notice Activity & use Limitation (AUL) for Inner and Outer Slip

17 TSCA jurisdiction NSTAR Facility, New Bedford (cont.) RTN proposed remedy suitable public meeting & comment period risk-based approval under (c) Multi-agency coordination EEA/MassDEP, ACOE, USEPA, City 9 regulatory programs Permitting: 18 months Outer Slip dredging & placement material in Inner Slip Construction: 5 months

18 NSTAR Facility, New Bedford (cont.) RTN Water Treatment Facility

19 NSTAR Facility, New Bedford (cont.) RTN Inner Slip In-Situ Solidification (ISS) In addition to Inner / Outer Slip Work: Perimeter Air Monitoring Dredge Sediment Curtain & Boom Vapor & Odor Suppression Foam Offsite Wetlands Mitigation

20 NSTAR Facility, New Bedford (cont.) RTN Outer Slip Cap Details AquaBlok Placement

21 NSTAR Facility, New Bedford (cont.) RTN Permanent Solution w/ AUL achieved for both Inner Slip & Outer Slip (land under water) unique ownership scenario allowed for AUL in a water body property is actually owned by Sprague Petroleum / NSTAR filled, stabilized Inner Slip became upland Inner Slip AUL allows for unrestricted use Inner Slip area provided cap is not disturbed Outer Slip allows for mostly unrestricted use area, provided cap is not disturbed (no mooring in area) Order Conditions required 3-year benthic layer monitoring (part AUL, last cycle due 12/13)

22 Former Chadwick Lead Mill Site, Marblehead RTN Property (6 acres) operated as lead mill between 1831 and 1910 destroyed by fire in 1897, rebuilt & destroyed by fire in 1968, abandoned metals (including lead) and PAHs released to environment surrounded by private residences; former railroad embankment (now bike/walking path); Wyman s Woods; and near-shore sediments Portions site in (& owned by) Salem and Marblehead Multiple Permits & Approvals Needed (2005 start date) MEPA Certificate, Order(s) Conditions Towns ConsComm, ACOE Section 404 Dredge Permit, MassDEP Chapter 91 Waterways Dredge Permit, MassDEP 401 Water Quality Certification, MassCZM Determination Consistency Remedy implemented by Private PRP between October 2010 and June 2012

23 Former Chadwick Lead Mill Site, Marblehead (cont.) RTN Work Areas

24 Former Chadwick Lead Mill Site, Marblehead (cont.) RTN Remediation began in November, 2010 Excavation lead-impacted soils and sediments in Coastal Resource Area Excavation contaminated soils in Wyman Woods, some upland areas (incl. Marblehead bike/walking trail) & abutting residential properties also excavated Goal Achieve No Significant Risk under MCP (Permanent Solution sought)

25 Former Chadwick Mills Lead Facility, Marblehead (cont.) RTN Restoration Coastal Resource Area Clean fill installed along coastal bank, intertidal beach & near-shore harbor edge Beach grades restored to original conditions Coir fascine logs installed along beach and bank to stabilize area New plantings installed along bank & beach

26 Former Chadwick Mills Lead Facility, Marblehead (cont.) RTN Completed Restoration Coastal Resource Area Public bike path/walking trail reopened to public (Nov 2011) Limited annual monitoring restored area (until 2016)

27 Former Coal Tar Processing Facility, Everett RTN Site was historically a tidal marsh filled beginning in 1890s & developed for industrial use by1900, a coal tar processing facility was operating on western bank Island End River operation ceased in 1960s historic fill impacts to the environment (including sediments) buildings demolished & area redeveloped as warehouse & commercial/industrial district

28 Former Coal Tar Processing Facility, Everett (cont.) RTN Historical fill resulted in releases to the environment Release Abatement Measure (RAM) Plan (May 2005) construction confined disposal facility (CDF) on portion western shoreline Island End River mechanical dredging Island End River sediment stabilization sediments in CDF some f-site disposal sediments placement sand layer to stabilize dredge footprint construction a surface cover on CDF and barrier wall along portion shoreline to mitigate potential discharges from upland to river

29 Former Coal Tar Processing Facility, Everett (cont.) RTN Permitting: approximately 12 months RAM construction: completed in July, 2007

30 Former Coal Tar Processing Facility, Everett (cont.) RTN July 2008 RAM activities supplemented to address areas residual sheen generation in RAM area: to fill larger voids in rip-rap placed during CDF construction, 3 to 6 inch stone placed atop existing larger rip-rap at toe CDF; marine mattresses (with organoclay attached to bottom) lowered into place approx. 5 feet away from CDF wall; organoclay placed in 5 foot strip between mattresses and CDF wall & covered with 6-inch layer 2-inch stone to protect the mattresses and organoclay; organoclay placed between seams mattresses to ensure coverage;

31 Former Coal Tar Processing Facility, Everett (cont.) RTN CDF Surface annual inspection visible portions surface water drainage features maintenance, as necessary, to ensure integrity CDF surface material CDF Wall annual inspection for 5 years, then every 5 years visual inspection by pressional engineer, certified diver maintenance, as necessary reapply epoxy coating to prevent wall deterioration fix fender system, if damaged

32 Climate Change & Reuse Clean Sediments Our Changing Coastal Landscape & Climate Change Increased temperature / Variable precipitation Extreme weather events / Sea level rise Loss habitat / Coastal erosion Reduction sediment load to beaches Climate Adaptation Strategy: Beach nourishment : Adding sediment ( beach fill ) to a beach/dunes system State Beach Nourishment Regulatory Process Wetlands Regs 310 CMR (dredging / dredge material disposal) Water Quality Certification Regs (314 CMR 9.00) and Public Waterfront Act (310 CMR 9.00)

33 Many Thanks to Key DEP Presentation Collaborators: Ms. Molly Cote, BWSC-SERO Mr. Steve Johnson, BWSC-NERO Mr. Paul Craffey, BWSC-Boston Mr. Jim Mahala, BRP-SERO For More Information Contact: Millie Garcia-Serrano, BWSC-SERO (508)