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MassDEP refines Subpart I Q&A to clarify ‘‘visible’’ coal-tar deposits and exposure-point calculations
Summary
MassDEP staff said outreach with the LSPA and National Grid prompted revisions to the Subpart I Q&A to clarify when coal-tar deposits trigger MCP requirements and how legacy data should be used in exposure-point concentration determinations.
Unidentified Speaker 1, a MassDEP program staff member, said the agency is revising the draft Subpart I Q&A after meetings with the LSPA and National Grid in July to clarify when coal-tar deposits meet MCP reporting and remediation thresholds.
The revisions, staff said, focus on two issues: defining a "visible coal tar waste deposit" and clarifying how to calculate exposure-point concentrations. "The intent is that is that the DEP's focus is not the fringe impacts that can otherwise be characterized with soil sampling, but the main concern is significant…
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