Waste Site Cleanup Advisory Committee Meeting Agenda Waste Site Cleanup Advisory Committee Meeting...

Waste Site Cleanup Advisory Committee Meeting Waste Site Cleanup Advisory Committee Meeting AgendaAgenda

April 25, 2013, MassDEP, One Winter Street Boston9:30 am General updates - Assistant Commissioner Ben Ericson

10:00 Forms/guidance to be updated to support MCP amendments- Liz Callahan/Paul Locke

10:15 Gardening BMPs & outreach/implementation - Paul 10:30 Consideration of new approaches to define & evaluate

short-term risk/Imminent Hazards under the MCP (Note: longer term discussion; not part of the current amendments) - Paul

11:00 Source control scenarios & proposed provisions - Liz 11:30 Adjourn

1

Amendment Implementation Amendment Implementation – Guidance & Form Updates

• Timeframes – by effective date, close to effective date, can wait

2

Guidance Revision PrioritiesGuidance Revision Priorities

• LNAPL amendments – revisions to the VPH/EPH guidance (2002) or separate document LNAPL Workgroup

• Interim Final Vapor Intrusion Guidance (2011)• Draft AUL Guidance (2010) - finalize;

incorporating earlier public comment and changes to reflect amendments

• New Q&As to assist in implementation of amendments

3

Other Guidance UpdatesOther Guidance Updates

• Retire NRS Guidance Manual • Lower priority - Update references/terminology

in other guidance, old Q&As, fact sheets and technical updates

4

Forms/Database...Forms/Database...

5

Permanent Solutions With Conditions But No AUL

For Potential Gardening Exposures

Issue #1: What Are the Recommended BMPs?

Other People’s Information

We don’t have to… don’t want to… reinvent the wheel or BMPs…

just Google® it

Issue #2: What Is DEP’s Enforcement Angle?

• As Proposed, the MCP would REQUIRE that the Permanent Solution Statement contain RECOMMENDATIONS for the use of Gardening BMPs under certain conditions.

• The relevant question is:“Does the PSS contain the appropriate BMP

recommendations?

DEP’s Goal is to educate & inform & minimize potential exposures where the direct contact

risks are already demonstrated to pose NSR, and the incremental exposure – even without BMPs – is thought to be minimal but difficult to quantify.

Question for Public Comment:Would the proposal do this?

Source Elimination/ControlSource Elimination/Control

• Source elimination or control is an existing requirement (40.1003(5))

18

Why Change It?Why Change It?• Other proposed amendments – Permanent Sol’n

with Active Pathway Elimination Systems and elimination of the LNAPL UCL - remove requirements that now define the endpoint for cleanup

• Providing more specificity re: adequate source control intended to ensure that the source is stable, prevent occurrence of new/unforeseen exposures after Permanent Sol’n and minimize the time period for existing impacts

19

Some MCP Context Some MCP Context • Difference between source elimination/control

for sudden releases versus historical sites• Other MCP requirements:

– expedite source elimination and control activities...

2- and 72-hour notifications trigger Immediate Response Actions, SRM & CEP require response

– aim at ensuring adequate temporal/spatial characterization of site conditions and risk, e.g., nature and extent, CSM, risk characterization, representativeness

20

Source Elimination/ControlSource Elimination/Control• Provide basic definition of “Source of OHM

Contamination” – refers to the original OHM release location and/or

contaminated media from which OHM can migrate

• Source of OHM Contamination shall be eliminated, if feasible

• If not feasible, then Source must be controlled; performance standards for “Source Control” are specified

Proposed DefinitionProposed DefinitionSource of OHM ContaminationSource of OHM Contamination

means a point of discharge of OHM into environmental media and/or OHM within environmental media, that is migrating or likely to migrate in a dissolved or vapor state or as a separate phase liquid. Sources of OHM may include, without limitation:

1. leaking storage tanks, vessels, drums and other containers;

2. dry wells or wastewater disposal systems that are not in compliance with regulations governing discharges from those systems;

3. contaminated fill, soil and sediment;4. sludges and waste deposits; and5. Nonaqueous Phase Liquids.

Source Control Source Control Performance StandardsPerformance Standards

• Absence of Non-Stable NAPL• Removal of LNAPL to extent feasible

(using LCSM principles)• OHM plumes in any media not expanding• Absence of DNAPL constituent

concentrations greater than 1% of their solubility limit

Scenario #1

OVERBURDEN

GROUNDWATER

BEDROCK

TANK

#1

OVERBURDEN

GROUNDWATER

BEDROCK

LEAK

TANK

#1

OVERBURDEN

GROUNDWATER

BEDROCK

LEAK

TANK

#1

OVERBURDEN

GROUNDWATER

BEDROCK

TANK

#1

OVERBURDEN

GROUNDWATER

BEDROCK

• Tank removed• Soil removed

#1

OVERBURDEN

GROUNDWATER

BEDROCK

• Tank removed• Soil removed

#1

OVERBURDEN

GROUNDWATER

BEDROCK

• Tank removed• Soil removed

#1

Scenario #2

OVERBURDEN

GROUNDWATER

BEDROCK

TANK

#2

OVERBURDEN

GROUNDWATER

BEDROCK

LEAK

TANK

#2

OVERBURDEN

GROUNDWATER

BEDROCK

LEAK

TANK

#2

OVERBURDEN

GROUNDWATER

BEDROCK

TANK

#2

OVERBURDEN

GROUNDWATER

BEDROCK

TANK

#2

OVERBURDEN

GROUNDWATER

BEDROCK

#2

• Tank removed• Soil removed

OVERBURDEN

GROUNDWATER

BEDROCK

#2

• Tank removed• Soil removed

Public Water

SSDS

Scenario #3

OVERBURDEN

GROUNDWATER

BEDROCK

TANK

#3

OVERBURDEN

GROUNDWATER

BEDROCK

LEAK

TANK

#3

OVERBURDEN

GROUNDWATER

BEDROCK

TANK

#3

OVERBURDEN

GROUNDWATER

BEDROCK

#3

• Tank removed• Soil removed

OVERBURDEN

GROUNDWATER

BEDROCK

#3

• Tank removed• Soil removed

OVERBURDEN

GROUNDWATER

BEDROCK

#3

• Tank removed• Soil removed

OVERBURDEN

GROUNDWATER

BEDROCK

#3

• Tank removed• Soil removed

Public Water

SSDS

OVERBURDEN

GROUNDWATER

BEDROCK

#3

• Tank removed• Soil removed

Public Water

SSDS

BEDROCK

#3

• Tank removed• Soil removed

Public Water

SSDS

BEDROCK

#3

• Tank removed• Soil removed

Public Water

SSDS