Project 1007

In 1987, the Valley Branch Watershed District constructed Project 1007, a large flood control project for the Tri-Lakes Area (lakes Jane, Olson, and DeMontreville). Project 1007 is a system of stormwater pipes, open channels, catchbasins, and two dams that direct the flow of water from the Tri-Lakes area to the St. Croix River. It also uses a number of lakes and creeks to connect to the St. Croix River.

Illustration map of Project 1007

One of those creeks, Raleigh Creek, flows through the former 3M Oakdale disposal site. Additionally, between the late 1980s to the early 1990s, untreated water from Washington County Landfill was discharged to Project 1007​.

Why it matters

Included in the 3M Settlement agreement: "The MPCA shall conduct a source assessment and feasibility study regarding the role of the Valley Branch Water District's project known as Project 1007 in the conveyance of PFCs in the environment.”

The goal of the assessment is to understand how Project 1007 may be contributing to the PFAS contamination in the East Metro area.

The map to the right, courtesy of Valley Branch Watershed District, outlines Project 1007 area.

What we're doing

The project is looking into the connections between the waste source areas, soil, sediment, surface water and groundwater from Project 1007. AECOM Technical Services Inc. is providing assessment and evaluation.

Investigation process

The results of the source assessment will help with the evaluation of near-term actions to address PFAS. The success of those near-term actions will be an important part of the Feasibility Study, which will include potential options for long-term drinking water protection to address PFAS impacts in the East Metro area.


Source assessment and feasibility study

A source assessment looks at a defined area (delineation), in this case Project 1007, to investigate. A feasibility study is a detailed evaluation of alternative cleanup options. Data from the source assessment will help to develop the feasibility study.

  • PFAS foam
    Information on foam found on lakes and streams or firefighting foam

2021 source assessment update

The 2021 source assessment update includes progress reports for specific areas of the Project 1007 corridor, called Focused Investigation Segments. The corridor is divided into seven segments to demonstrate the unique ways PFAS move through the Project 1007 corridor and may pose risks to human health and the environment. The progress reports represent the current understanding of where PFAS exists and moves through the environment. Further updates will be provided as the study continues.

Map outlining locations of Focused Investigation Segments 1-7. PDFs with corresponding reports for each segment below image.


2020 source assessment update

The 2020 source assessment update is provided below in a six-month progress report. The report includes data and observations made during the initial Project 1007 investigation. Some of these files are very large.