Water Quality Update at City Council Meeting
Update on PFAS results for Horn Pond, regulatory information, city's actions regarding PFAS, treatment methods, compliance with MassDEP standards, drinking water systems exceeding standards, and reasons behind EPA's new health advisory levels.
Uploaded on | 0 Views
Download Presentation
Please find below an Image/Link to download the presentation.
The content on the website is provided AS IS for your information and personal use only. It may not be sold, licensed, or shared on other websites without obtaining consent from the author. If you encounter any issues during the download, it is possible that the publisher has removed the file from their server.
You are allowed to download the files provided on this website for personal or commercial use, subject to the condition that they are used lawfully. All files are the property of their respective owners.
The content on the website is provided AS IS for your information and personal use only. It may not be sold, licensed, or shared on other websites without obtaining consent from the author.
E N D
Presentation Transcript
Water Quality Update Carol A. Rego, P.E. City Council Meeting October 4, 2022
Outline 1. Update: PFAS Results for Horn Pond; Regulatory Info 2. Update: What is the City Doing about PFAS? 3. Update: Treatment to Remove PFAS 4. Next Steps and Timeline 5. Questions/Discussion 2
Updated PFAS6 Sampling Results 3rd Quarter 2022 30 25 Invalidated by MassDEP* 20 Awaiting Lab Results 15 10 5 0 11/12/21 01/31/22 04/25/22 07/27/22 10/07/19 11/07/19 03/23/20 06/25/20 09/29/20 12/01/20 12/28/21 01/22/21 02/26/21 03/11/21 04/23/21 05/28/21 06/15/21 07/26/21 08/05/21 08/31/21 09/24/21 09/28/21 10/29/21 12/14/21 12/29/21 02/24/22 03/09/22 05/24/22 06/24/22 08/10/22 09/01/22 09/23/22 Average = 17.9 ppt *7/27/22 sample results were not accepted by MassDEP due to laboratory QAQC issue 4
Compliance with MassDEP Standard April 2021 New MassDEP Regulation Effective 30 24 25 22 22 20 16 16 15 13 13 10 5 0 Q1 2021 Q2 2021 Q3 2021 Q4 2021 Q1 2022 Q2 2022 Q3 2021 PFAS6 Quarterly Average (ppt) MassDEP Standard (ppt) 5
Drinking Water Systems with PFAS6 Over MassDEP Standard of 20 ppt https://www.mass.gov/info-details/per-and-polyfluoroalkyl-substances-pfas#pfas-detected-in-drinking-water-supplies-in-massachusetts- 6
Why Did EPA Issue New Health Advisory Levels? To protect public health & keep communities informed when new science becomes available Non-enforceable & non-regulatory Calculated to offer a margin of protection against adverse health effects and take into account other potential sources of exposure beyond drinking water EPA Health Advisory Level (June 2022) Woburn Results (since 2019) Currently Regulated in Massachusetts? PFAS Compound Value* Type Average* Maximum* PFOA 0.004** Interim Yes 7.1 10.4 PFOS 0.02** Interim Yes 8.0 11.0 Gen-X 10 Final No Never detected Never detected PFBS 2,000 Final No 3.9 5.1 * All values in parts per trillion ** Below levels that can be measured by current technology
Update: What is the City Doing? Oct. 2019 Dec. 2020 June 2021 Jan. 2022 March 2022 July 2022 Aug. 2022 Began Proactive Sampling Submitted Applicatio n for MassDEP Grant Grant Awarded and Treatment Study Started Submitted Short- term Corrective Action Plan to MassDEP Bottle Filling Station in Service Began Field Investiga- tions at Horn Pond Submitted SRF Funding Request to MassDEP Submitted Bench- Scale Testing Study Results to MassDEP Aug. 2022 New MassDEP PFAS Standard Effective Apr. 2021 Submitted Long-Term Corrective Action Plan to MassDEP Feb. 2022 Bottled Water Rebate Program Jan, 2022 MassDEP SRF Funding Meeting March 2022 Completed Field Investiga- tions Sept. 2022 New MassDEP Regulation Oct. 2020 Provide regular updates on levels detected and actions taken Updates since 4/19/22 City Council Meeting shown in green 9
Original Pump Station 2002 Treatment Building 2011 Treatment Support Building PFAS 2011 Treatment Upgrade (Manganese Removal) Treatment 11
Geotechnical Field Investigations Original Pump Station Placeholder for site plan whole drawing to provide context (maybe outline existing buildings in color) 2002 Treatment Building 2011 Treatment Support Building PFAS Treatment 2011 Treatment Upgrade (Manganese Removal) 12
Field Investigations Geotechnical Four borings advanced on July 7 and 8 1 boring encountered refusal and terminated at depth of ~ 6 feet 3 borings were advanced to a depth of about 26 feet Topographic Survey and Wetlands Flagging Ground Penetrating Radar (underground utilities) Awaiting data and CADD files 13
Next Steps Submit Conceptual Design to MassDEP as part of Long-Term Corrective Action Plan (due February 8) Meet with Clean Water Trust re: funding process (including state disbursement of federal Infrastructure funds) Site investigations Subsurface investigations (borings) Survey Environmental features (wetlands flagging, etc.) August 2022 Submit funding application (State Revolving Fund; potential infrastructure funding) Design (30/60/90/100% milestones) Cost estimates at 60 and 100% Permitting Bidding/contract award Construction Startup In Parallel 15
