NEW BEDFORD HARBOR SUPERFUND SITE · i hot spot dredging i . new bedford harbor superfund site ....

NEW BEDFORD HARBOR SUPERFUND SITE

COMMUNITY FORUM NOVEMBER 29, 1995

POSTER SESSION

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IHOT SPOT DREDGING I


COMMUNITY FORUM NOVEMBER 29,1995

POSTER SESSION .~

-----:

Hot Spot Dredging Facts

"

• Dredging started in late April 1994 and was completed in early September 1995

• 14,000 cubic yards of sediment were dredged (about 20,000 tons)

• 5 acres of the river bottom with PCB levels above 4000 parts per million were dredged 1.5 to 2 feet deep (see adjoining map)

• 300 tons of PCBs removed from the Acushnet River

• 160 million gallons of seawater which was collected by the dredge along with the sediments were treated, tested and returned to the river

• The hot spot sediment is now stored temporarily at the Sawyer Street hot spot confined disposal facility or CDF (see adjoining map), until an alternative treatment process is selected and implemented

• Total construction and operation costs for this dredging project was about $28 million

ITREATABILITY STUDIES I



POSTER SESSION

TREATABILITY STUDY TEST OBJECTIVES

• PROVIDE A WASTE PROFILE FOR Tt-E HOT SPOT SEDIMENTS

• EVALUATE AN) QUANTIFY THE EFFECTIVENESS OF EACH TREA ThENT TECHNOLOGY TO MEET THE PROJECT GOALS.

• QUANTIFY THE DISPOSITION OF ALL MA TERIALS TO SUPPORT A MASS BALANCE EVALUATION.

• PRODUCE OAT A OF SUFFICENT QUAUTY SUCH THAT A RISK ASSESSMENT OF TREA TMENT RESIDUALS, IF REQUIRED, CAN BE CONDUCTED FOR EACH TECHNOLOGY.

• EV ALUA TE Tt£ VIABILITY OF THE TREA TMENT TECHNOLOGES/PROCESSES TO BE SCALED-UP TO FULL SCALE OPERATIONS INCLUDING THE OVERALL DEVELOPMENT TIME-FRAME AND ESTNATED FULL SCALE TREATMENT COSTS.

• CHARACTERIZE THE OPERATIONAL HAZARDS ASSOCIATED WITH FULL SCALE IMPLEMENTATION OF THE TECHNOLOGIES.

• EVALUATE THE TECHNOLGES' PERFORMANCE AGAINST THE NINE DET AILED EV ALUA TION CRITERIA CONTAINED IN THE NA nONAL CONTINGENCY PLAN (NCP).

BENCH SCALE TREATABILITY STUDIES

• EVALUATE THE ABILITY OF SOLIDIFICA T10N/ST ABILIZA TION (SIS) ADMIXTURES TO REDUCE THE LEACHABILITY OF THE PCBs AND HEAVY METALS.

• EV ALUA TE 3 DIFFERENT ADMIXTURES :

- WORLD ENVIRONMENTAL ADMIXTURE

- MARCOR ENVIRONMENTAL ADMIXTURE

- EBASCO CEMENT-BASED ADMIXTURE

• TEST BOTH "RAW" UNTREATED HOT SPOT SEDIMENT FROM THE CDF AND SOUD PHASE "TREA TED RESDUALS· RESULTNG FROM THE ON-SITE CHEMICAL DESTRUCTION TREA T ABIUTY STUDIES.

• SAMPLES TESTED FOR :

- LEACHABLITY OF CONTAMINANTS

- COMPRESSIVE STRENGTH

- OFF-GASING

HL8RD6.DWG

PILOT SCALE TREATABILITY STUDIES

• EVALUATE THE ABLITY OF CHEMICAL DESTRUCTION TECHNOLOGES TO TREAT THE HOT SPOT SEDIMENTS.

• ALSO EVALUATE TE~OLOGIES WHICH USE A CONTAMINANT SEPARATION STEP PRIOR TO CHEMICAL DESTRUCTION.

• TEST SEVERAL DFFERENT TREATMENT TECHNOLOGIES/ PROCESSES (HOPEFlLL Y 3).

• CONDUCT TESTS AT THE SAWYER STREET SITE IN CONJUNCTION WITH THE TECHNOLOGY VENDORS.

• ON-SITE LOGISTICAL SUPPORT PROVIDED BY THE ARMY CORPS OF ENGINEERS.

----

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PROPOSED CLEANUP PLAN FOR ROD II



POSTER SESSION

New Bedford Harbor Superfund Site

Summary ofProposed Cleanup Plan for ROD /I

I. Estuary Portion of the Site

• dredge approximately 415,000 cubic yards (cy) in areas with sediment PCBs greater than 10 parts per million (ppm) (about 128 acres - see adjoining poster), except. ..

• ...in salt marsh areas along the Fairhaven shore, a 50 ppm action level would be used to minimize salt marsh destruction;

• build confined disposal facilities (CDFs) above contaminated sediments in areas 1 and 1 B (see adjoining map) on the New Bedford shoreline for containment of the dredged sediments (avoids dredging an additional 116,000 cy);

• treatment of the seawater drained from the dredged sediments

• long term monitoring and maintenance of CDFs;

• beneficial reuse of both CDFs 1 and 1 B (for example, as athletic fields, bike paths, or bird sanctuaries)

New Bedford Harbor Superfund Site

Summary ofProposed Cleanup Plan for ROD /I (Cont'd)

II. Lower Harbor Portion of the Site

• dredge approximately 60,000 cy in areas greater than 50 ppm PCBs, including two spots just south of the hurricane barrier (see adjoining poster);

• build a CDF above contaminated sediments in area 7 in the North Marine Terminal area (avoids dredging an additional 17,000 cy) for containment of the dredged sediments. This CDF would be constructed for future use as a commercial waterfront facility, and for future expansion to store some of New Bedford's maintenance dredge material;

• as with the estuary CDFs, decanted seawater would be treated, and a comprehensive monitoring and maintenance program would be implemented.

Xey

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Ar... of .ediment above cleanup level.

New Bedford Harbor ROD II

proposed Dredging Areas and CDFs

IPOTENTIAL CDF OPTIONS I



POSTER SESSION

Location of hot spot COF

L--__

KeyCDF Volume (ey)

CDF 1 270,000 • portion of CDF 7 reserved forCDF 1A 28,)00 CDr 1B 90,000 navigational dredged materia; CDF 3 134,700 cor 4 20,000 COF 6 91,200 cor 7 120,000 cor 8 42,000 UNIVERSE OF MOST PROMISING CDF LOCATIONS cor 10/10A 267,000 ISLAND 1 354,000 (Not all locations would be needed) ISLAND 2 246,000

Volume of sediments using COFs 1, 10 and 7 a 475,000 cy

AND 2

VSt-lN£T

COF 6, or potential site for temporary water treatment plant

VolUme if CDFs located outside of contaminated areD ~ 60R,OOO cy

Location of hot spot CDP

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OPTION 1: CDFs 1B, 7 & ISLAND CDF 1

Location of hot spot CDF

COF S II N C I ne tJ

OPTION 2: CDFs IB,6,7 & 10

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OPTION 3: CDFs lA, 1B,3,4,6,7,8,& 10% OF 10


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OPTION 4: CDFs I (reduced) lA, IB, 3,(reduced) & 7

PHOTOSIMULATIONS OF CDFs I AND 18

• CDF IS (foreground}s CDF I (background) - Simulated • Estuary - Existing • CDFI - Simulated • CDFI Area - Existing



POSTER SESSION

BUILDING A CONFINED DISPOSAL FACILITY (CDF)



POSTER SESSION

BUILDING A CDF

STEP 1 : CONSTRUCT THE PERIMETER DIKES

• TWO TYPES OF EARTHEN DIKES :

A. TYPICAL IN-WATEA DI<E

1.6' STatE PR01EC11ON wmt f <R\VB.. BASE

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B. TYPICAL LAND DKE

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• A VERTICAL BULKHEAD-BASED DESIGN WOULD BE USED AT CDF 7 TO ALLOW FOR REUSE AS A DOCKING FACILITY

• INSDE SLOPES OF ALL DIKES WOULD BE LINED WITH IMPERMEABLE MATERIAL

• MONITORING WELLS AROUND THE CDF PERIMETER WOULD ALSO BE INSTALLED AT THIS 8TAGE

BUILDING A CDF STEP 2 : FILL WITH CONTAMINATED SEDIMENTS

~T8) WAlER

RET\IHD TO HAABOFI

DREDGE AN) CDF DISPOSAL

• ONCE A WATER TREATMENT PLANT IS CONSTRUCTED, DREDGING IS STARTED. SEDIMENTS SETTLE IN THE MAIN SECTION, AND SEA WATER IS DRAltED OFF INTO A SECON>ARY SECTION AND SENT TO THE WATER TREATMENT PLANT.

STEP 3 : ADD PRELIMINARY CAP USING . CLEANER SEDIMENTS FROM NAVIGATIONAL DREDGING

• 2-4' THICK LAYER OF SEDIMENTS ADDED (FROM SHIP CHANNEL DREDGING) TO ACCELERATE SEDIMENT CONSOLDATION.

STEP 4 : 3-5 YEAR CONSOLIDATION & PORE WATER COLLECTION PERIOD

• THE DREDGED SEDIMENTS NEED TME TO SETTLE AND COMPACT N ORDER TO PRODUCE A FIRM FOUNDATION FOR FINAL CAP AND ~AL LAND USE.

• ·WICK" DRAINS COULD BE ADDED TO MAXIMIZE THE AMOUNT OF CONTAMINATED PORE WATER COLLECTED FOR TREATMENT.

• THE ELEVATION COULD DROP FIVE FEET OR MORE DURING THIS 3-5 YEAR SETTLING PERIOD.

BUILDING A CDF

STEP 5 : INSTALL FINAL IMPERMEABLE CAP

• THE FNAL CAP WOULD ACT AS A PERMANENT U~RELLA OVER TtE DREDGED SEDNENTS. THE LAVERS WITHIN THE CDF WOULD THEN BE TYPICALL Y AS FOLLOWS:

ClAY LOAM TOPSOIL

I*ERMEABLE CAP -

CO~ACTED-RrE MATERIAL

NAVIGATIONAL DREDGED MATERIAL

CONTAMNATEDDREDGED __ MATERIAL

STEP 6 : IMPLEMENT FINAL LAND USE DESIGN

• ONCE THE FINAL CAP IS COMPLETED, THE CDFs COULD BE BENEFICIALLY RE-USED AS DETERMINED BY THE COMMUNITY. EXAMPLE END USES COULD BE:

- BIRD SANCTUARES - LIGHT COMMERCIAL FACILITIES - ATHLETIC FIELDS - SHORELINE PARKS - BIKE PATHS

ITHE COMMUNITY FORUM I



POSTER SESSION

How to be informed and involved in the New Bedford Harbor cleanup?

• Speak to your Forum representatives

• Attend Forum Meetings (next one 12/7/95) or Subcommittee Meetings

• Attend upcoming public meetings (Jan-Feb 1996)

• Get on EPA's mailing list

• Watch the forum sessions on local cable stations

• Read EPA's progress reports in the Standard Times

New Bedford Harbor Forum Representation

• Concerned Parents of Fairhaven

• Downwind Coalition

• Hands Across the River Coalition

• Massachusetts Department of Environmental Protection

• New Bedford Business Groups

• New Bedford City Council

• New Bedford Harbor Development Commission

• New Bedford Mayor's Office

• National Oceanic and Atmospheric Administration

• State Elected Officials

• Town of Acushnet

• Town of Dartmouth

• Town of Fairhaven

• U.S. Environmental Protection Agency

• Wampanoag Tribe

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