project 1007 – progress update · 2020. 1. 24. · project 1007 – progress update. 1/24/2020 2...

Rebecca Higgins PG | MPCA

Amanda Lanning and Marie De Los Santos | AECOM

January 14 2020

Project 1007 ndash Progress Update

21242020

Agenda

3

bull As part of the 3M Agreement and Order the MPCA is conducting ldquoa source assessment and feasibility study regarding the role of the Valley Branch Water Districtrsquos project known as Project 1007 in the conveyance of PFCs in the environmentrdquo

3M Settlement Language

4

PFOS ndash East Metro PFAS Area ndash North of I-94

6

Focused Investigation Summer 2020 - 2021

Beta Phase Investigation

Fall 2019 ndash Summer 2020

Baseline Sampling Event

Fall 2019

Investigation Progress

What Do We Need to Consider

Project 1007

A Complex Problem

Surface Water Flow

Ground water Flow

Complicated Geology

Numerous Surface Water

Bodies

Conveyance Infrastructures

Variable Precipitation

RatesMultiple PFAS

Compounds

PFAS ndash The Forever

Chemical

Potential Multiple

PFAS Sources

Project Area Size

High Infiltration

Areas

Depth of Impacted Aquifers

8

PROJECT 1007 PHASED INVESTIGATION APPROACH

VAP = Vertical Aquifer Profiling

9

10

Beta Phase Drilling Locations

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Cake Sponge Layer=

AquiferFrosting Layer

=Confining Layer

Frosting Layers=

Confining Layers

Cake Layers=

Aquifers

What Is the Bedrock Valley

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AquifersAquifers

Confining LayersConfining Layers

What Is the Bedrock Valley

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Variable Glacial Layers

Highly Fractured Zone ndash Leaky

Confining Layer

Narrow Bedrock Valley

Bedrock FindingsPreferential Pathways

Beta Phase InvestigationMethods of Investigation

Baseline Sampling Analytical Results

Project 1007 Overview Map Sampling Areas and Sample Counts - Baseline Investigation

19

Photo Credit McMurdo 2008

Approximately 50 um (005mm) thick

An interface of gaseous exchange High carbon content

Documented reservoir of surface-active chemicals including fatty acids surfactants PFAS and other compounds

Surface Micro Layer (SML)

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PFAS-Containing Foam Appearance

21

PFAS-Containing Foam Appearance

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PFAS-Containing Foam Locations

23

River with previously low level PFAS

PFAS foam in a drainage ditch

PFAS foam on a large creek

PFAS foam on a large creek

Wisconsinrsquos PFAS Foam Experience

24

Frozen foam islands

Infrared Camera imaging for source area seeps

Frozen Foam

Dock on a lake with nearby sources

Michiganrsquos PFAS Foam Experience

PFAS Risk Assessment Values

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bull People and pets should avoid contact with foam

bull Wash skinfur that has come into contact with suspected PFAS-containing foam with soap and water

bull Surface water concentrations of PFAS are much lower indicating water is safe for recreation

bull Additional data will be collected

bull MDH will conduct additional recreational risk assessment to verify these conclusions

Human Health Concerns

Foam

Soil

Surface Water

Sediment

Non-Drinking Water Health Risk Values

NEXT STEPS

Investigating

Communicating

Coordinating

bull Across programsAgencies

bull Appropriate Response Actions

Evaluating

bull Oakdale Disposal Controls

bull Health and Environmental Risks

bull Drinking Water Groundwater Ecosystem Receptors

28

Conclusions

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What has been completed in 1 year Road Map for Comprehensive Investigation First Phase Complete Second Phase In-Progress

Investigation continues through 2021

Complex problem ndash no easy fix to forever chemicals

PFAS-containing foam can be found in PFAS-impacted surface water

People and pets should avoid foam

Thank youRebecca Higgins PG MPCA

RebeccaHigginsstatemnus

Amanda Lanning and Marie De Los Santos AECOM

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