Publication Summary

This is the study plan for Sumas-Blaine Surficial Aquifer Long-Term Ambient Groundwater Monitoring.

The purpose of this project is to implement a long-term ambient groundwater monitoring program in the Sumas-Blaine surficial aquifer. This aquifer has been identified as one of the most severely contaminated aquifers in Washington State (Erickson, 2000).

The aquifer is contaminated with elevated concentrations of nitrate. A previous study examining trends and seasonal variations determined that nitrate is increasing in the aquifer at a rate of approximately 0.5 mg/l per year. Seventy-one percent of the wells sampled had at least one concentration higher than the groundwater quality nitrate standard of 10 mg N/l, and 31% of the wells displayed a statistically increasing nitrate tend over the 2003-2005 sampling period (Redding, 2008).

This study is designed to build on the previous monitoring efforts in order to provide an annual assessment of the status of the groundwater quality. Additionally, this monitoring program can assist in identifying new groundwater problems which may arise. Thirty-five wells will be sampled annually for nitrate, chloride, and bromide in March beginning in 2009. This project will continue as long as funding is available.

Each study conducted by the Washington State Department of Ecology (Ecology) must have an approved Quality Assurance Project Plan. The plan describes the objectives of the study and the procedures to be followed to achieve those objectives. After completion of the study, a final report describing the study results will be posted to the Internet.

Link to EIM data for User Study ID mred0001