Per- and polyfluoroalkyl substances (PFAS) are a class of emerging contaminants known to impact groundwater and surface water. The information surrounding toxicity, laboratory methods, investigations, and remediation strategies is evolving, and the Interstate Technology and Regulatory Council (ITRC) recently published three technical factsheets summarizing current information on PFAS. The fact sheets are available online.
These fact sheets specifically relate to:
1. History and Use
2. Regulations, Guidance, and Advisories
3. Naming Conventions and Physical and Chemical Properties
Later this month, ITRC plans to finalize three additional guidance documents on Fate and Transport, Site Characterization, and Remediation, which will be made available on the ITRC website.
On October 4, 2017, please join the RR Program for a teleconference discussion of the RCL spreadsheet and a substitute method of calculating alternative non-industrial direct-contact residual contaminant levels (RCLs) for select carcinogenic polycyclic aromatic hydrocarbons (cPAHs).
Waste management specialist Paul Grittner and hydrogeologist David Swimm, both with the RR Program, will discuss the modified soil RCL spreadsheet which can be used to attain compliance when the applicable cPAH direct contact RCLs in NR 720 is not practicable. The spreadsheet changes how non-industrial direct contact RCLs for seven cPAHs are assessed. The spreadsheet evaluates cPAH compounds on a cumulative basis only, rather than on an individual compound basis and a cumulative basis.
This approach is allowed under NR 722, but the DNR’s pre-approval is required prior to implementation. Paul and David’s presentation will focus on the process recommended for assessing PAH data using the modified soil RCL spreadsheet, as well as the DNR pre-approval process.
The teleconference will take place at noon on Oct. 4. No pre-registration is required. Call 1-855-947-8255 and use passcode 6612 745#. This presentation will be recorded and available the following day on the RR Program’s Training Library.
The Remediation and Redevelopment Program will host a two-hour “Q & A” regarding the agency’s new guidance on vapor intrusion. The open house event will take place on Tuesday, August 29, in Madison, and via teleconference at the same time.
The guidance – RR-800 – is currently available for written public comment through the DNR’s “proposed program guidance” web page; comment on the document will be accepted through September 8, 2017.
Subjects discussed during the “Q & A” session will not take the place of written comments on the document. Rather, the opportunity is meant to help further clarify the material for those who may have questions about the content, with hope of alleviating potential erroneous comments.
Details of the vapor intrusion “Q & A” open house are:
Date: Tuesday, August 29
Time: 9:00 – 11:00 CST
Location: DNR Central Office, Room G-09, 101 S. Webster St., Madison, WI 53707
Alyssa Sellwood, the Remediation and Redevelopment Program’s vapor intrusion and dry-cleaning team leader, will present our Issues & Trends conference call in September. Alyssa will discuss vapor intrusion sampling, including a discussion of action triggers, mitigation and long-term monitoring.
The RR Program seeks your input on a significantly revised document titled, RR-800, Addressing Vapor Intrusion at Remediation & Redevelopment Sites in Wisconsin. The revisions to RR-800 include: updates from ITRC’s and USPEA’s vapor guidance; additional details on required deliverables; expectations for outreach; clarification on preemptive mitigation; and a significantly expanded discussion on vapor mitigation (design options, performance verifications, long-term operation and maintenance, and continuing obligations).
Alyssa Sellwood, a Hydrogeologist with the Remediation and Redevelopment Program and the leader of the dry cleaning and vapor intrusion teams, will present the next Issues & Trends training event on Wednesday, August 9, at noon. No pre-registration is required.
Sellwood’s presentation will be an overview of forthcoming additions and modifications to the RR Program’s existing guidance on vapor intrusion – RR 800 – Addressing Vapor Intrusion at Remediation and Redevelopment Sites in Wisconsin. We originally published the guidance in 2010, but revisions are necessary as knowledge and understanding of vapor intrusion has grown. The guidance is being readied for public comment and includes such updates as commissioning and inspecting vapor mitigation systems, mitigating vapor risk in new construction, and evaluating and addressing potential vapor risk in large commercial and industrial buildings.
As part of the Remediation and Redevelopment Program’s continuing outreach to its customers, the program wants to remind consultants and responsible parties that:
(1) Wis. Admin. Code § NR 700 rule series (hereafter “NR 700”) specifies the technical reports or documents that must be submitted to the Department of Natural Resources (DNR) regardless of whether the responsible party is requesting a fee review or not; and
(2) Those documents are to be prepared by or under the supervision of a professional engineer, hydrogeologist or scientist as those terms are specifically defined in NR 712.03. This rule chapter requires: (1) appropriate qualifications of the consultant; (2) signatures; and (3) certification language to be included with the appropriate NR 700 submittals.
Semi-annual reporting for the period of January 1, 2017 to June 30, 2017 is due August 8, 2017. Semi-annual reporting is required of responsible parties (RPs) for all “open” sites, including those sites the DNR formerly classified as “conditionally closed,” in the BRRTS online database. Consultants may submit these reports on behalf of the RPs.
An email from the DNR with your unique report identification number will go out on July 7, 2017. If you do not receive an email, you can request a number by submitting the Report ID Request Form. The Report ID number you will receive uniquely identifies the activity for which you wish to report, the reporting period, and verifies the person using the ID is authorized to submit the report. If you have any questions, please contact Tim Zeichert at (608) 266-5788.
This guidance document introduces the modified residual contaminant level (RCL) spreadsheet that allows for an alternative method of calculating non-industrial direct contact RCLs for seven carcinogenic polycyclic aromatic hydrocarbons (cPAHs). The modifications are based on a reassessment of the risk posed by cPAHs by the Wisconsin Department of Health Services.
The modified spreadsheet assesses these cPAHs exclusively on cumulative risk and does not assess their individual compound-specific risk. Use of this spreadsheet complies with the requirements of Wis. Admin. § NR 722.11 for developing alternate standards when meeting the RCLs in Wis. Admin. § NR 720 is not practicable.
The comment period will be open through May 31, 2017. This document can be reviewed on the Department’s public input web page, and comments can be submitted to Paul Grittner.
The RR Program recently added four, new online tools to our vapor intrusion (VI) prevention web page to assist environmental professionals as they prepare VI assessments or plan for outreach on a site impacted by vapor intrusion.
Vapor Intrusion 101 video uses a hand drawn animation technique to introduce the concept of vapor intrusion. It is intended for use in conjunction with factsheets and personal communication when talking with a property owner who is unfamiliar with vapor intrusion.
RR-067: Vapor Intrusion Investigation – Information Sheet for Neighbors can be given to an off-site property owner when access is needed to investigate vapor intrusion on their property. This factsheet provides an introduction to environmental investigations, identifies the parties involved, and clarifies who the property owner can contact with questions.
The fourth new tool is on the same web page, under the “screening levels” tab: