HomeMy WebLinkAbout03.a. Update on the Regional Per-and Polyfluoroalkyl substances (PFAS) Phase II StudyPage 1 of 5
Item 3.a.
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March 19, 2024
TO: REAL ESTATE, ENVIRONMENTAL AND PLANNING COMMITTEE
FROM: COLLEEN HENRY, ENVIRONMENTAL COMPLIANCE PROGRAM
ADMINISTRATOR
BLAKE BROWN, LABORATORY PROGRAM ADMI NISTRATOR
REVIEWED BY: LORI SCHECTEL, ENVIRONMENTALAND REGULATORY COMPLIANCE
DIVISION MANAGER
GREG NORBY, DEPUTY GENERAL MANAGER - OPERATIONS
ROGER S. BAILEY, GENERAL MANAGER
SUBJECT: UPDATE ON THE REGIONAL PER -AND POLYFLUOROALKYL
SUBSTANCES (PFAS) PHASE 11 STUDY
Central San participated in a two-phase Per- and Polyfluoroalkyl Substances (PFAS) study administered
by Bay Area Clean Water Agencies (BACWA) and San Francisco Estuary Institute (SFEI) in response to
State Water Board Order, WQ 2020-0015-DWQ. The study was approved by the Water Board in lieu of
the statewide order for Region 2's Publicly Owned Treatment Works (POTWs), with the intent of providing
complimentary data. The first phase was completed in 2020, and the results of the second phase were
released in early 2024. Phase two sought to investigate the removal of total oxidizable precursors (TOP)
from influent to effluent and to quantify residential and industrial sources of PFAS.
Strategic Plan Tie -In
GOAL TWO: Environmental Stewardship
Strategy 1 - Achieve compliance in all regulations
ATTACHMENTS:
1. Presentation
March 19, 2024 REEP Committee Meeting Agenda Packet - Page 3 of 17
Page 2 of 5
March 19, 2024
BACWA Region 2
PFAS Update
Real Estate, Environmental &
Planning Committee Meeting
Lori Schectel I
Environmental & Regulatory Compliance Division Manager - -
Blake Brown
Laboratory Program Administrator
Colleen Henry
Environmental Compliance Program Administrator
1
BACWA Region 2 PFAS Study Overview
2019 Statewide Investigative Order (WQ 2020-0015-DWQ)
Phased investigation to test drinking water systems and site
investigations at high -risk locations for per -and polyfluoroalkyl —
substances (PFAS)
Bay Area Clean Water Agencies (BACWA) worked with State and
Regional Water Boards to design a parallel study in -lieu of the State
Order ,
BACWA-SFEI Region 2 Study �_ BA AREA
CLEAN WATER
Complimentary to Statewide Investigative Order rf A G E N C I E S
Sub -set of Bay Area publicly owned treatment works (POTWs)
Two phases •a" " "'
Added analysis of Total Oxidizable Precursors (TOP)°"°°°•°`° °�•
One lab used for all analyses
001
2
March 19, 2024 REEP Committee Meeting Agenda Packet - Page 4 of 17 1
Page 3 of 5
BACWA Region 2 PFAS Study Recap
Phase I
Fall 2020 Median Phase 1 Influent and Effluent Results
250
Observed Target PFAS conc. in Effluent>lnfluent
TOP analysis was able to explain why p°
No observable correlation between industry and PFAS
concentration
—a SDD
Data Gaps
No TOP data for Effluent so
■
Upstream Contributions °
in��ont
EM�NI
Phase II
Spring 2022 Source: BACWA PFAS Fact Sheet, Phase
I Study Results
Explored unanswered questions from Phase I
Targeted Residential & Industrial Contributionsmi
TOP Analysis
Explore useability of AOF (Adsorbable Organofluorine)
Plant sampling at Influent and Effluent
Sewershed Sampling to establish a residential baseline me to �eF pras'1
''+o oompowmm i
Targeted industrial sampling ^^°sue "^
❑�.n K,nam �.•
Source: BACWA,
Fact Sheet - Feb
PF4',
2024 PFAS Study
[onpwna
IcA.. PFMII
Summary
3
Phase II Sewershed SamplingAW
3 Residential Sites:
Ruth Drive, Pleasant Hill (-234 single-family homes)
Rosincress Drive, San Ramon (-252 single-family homes)
Creekside Drive, Walnut Creek (-9 apartment complexes & Elks Lodge)
3 Industrial Discharger Sites:
San Ramon Regional Medical Center
Nu West Textile Group
John Muir Medical Center, WC
4
March 19, 2024 REEP Committee Meeting Agenda Packet - Page 5 of 17 2
Page 4 of 5
5
Phase II Findings: Treatment Plant
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5 378
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tap ■T�rget
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2W LAuo ®TOP
176
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Source: BACWA, Fact Sheet - Feb 2024 HAS Study Summary
Findings:
Total Oxidizable Precursors Influent>Effluent
Demonstrates removal across the treatment process
On average, about half of the mass of total quantifiable PFAS
contained in POTW influent was partitioned to biosolids
Phase II Findings: Sewershed
Findings:
• TOP Residential < Influent (slightly)
• TOP Industrial Laundry > Influent (significantly)
• TOP Car Washes > Influent (moderately)
Irmo
goo
00
N
mo
�C sm
200
4 ■ Targea
Source: BACWA,
Fact Sheet - Feb
2024 PFAS Study
Summary
March 19, 2024 REEP Committee Meeting Agenda Packet - Page 6 of 17 3
Page 5 of 5
Next Steps
BACWA Phase III study
San Francisco Estuary Institute (SFEI) applied for grant funding from EPA's
Water Quality Improvement fund
BACWA provided a support letter and pledge of $100,000
Tentative plan to start Phase III in July 2025 &EM
EPA:s PFAS Strategic Roadmap:
Identification of controllable sources into sewer Second Annual Progress Report
Two PFAS Analytical Methods Finalized in January 2024
Method 1633 — 40 PFAS compounds (Can be used for National Pollutant
Discharge Elimination System permits)
Method 1621— Adsorbable Organic Fluorine r- • . �-
March 19, 2024 REEP Committee Meeting Agenda Packet - Page 7 of 17 4