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