Huron River: 2018 - Present
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2018 | 2019
- January 17 - Willow Run Airport requested an extension to gather wet-weather PFAS samples related to the short-term storm water characterization study until August 31, 2020. This request was reviewed and approved by the WRD's compliance staff and district supervisor.
- January 15 - EGLE received a work plan from the Daimler Chrysler Scio facility for additional PFAS sampling at the site including a potable well on-site.
- January 21 -- The effluent from the Wixom WWTP was 40 ppt for PFOS.
- February 13 - EGLE collected fish from Silver Lake in the Pinckney Recreation Area.
- February 18 -- The effluent from the Wixom WWTP was 18 ppt for PFOS.
- February 20 -- Sampling of Quality Steel (Milford, MichiganI) source water well. These results were ND for all tested PFAS compounds.
- February 24 - EGLE approved the work plan for additional sampling at the Daimler Chrysler Scio facility.
- February 25 - EGLE had an internal meeting to discuss the need for residential well sampling at the Daimler Chrysler Scio facility. It was decided that Dr. David W. Hyndman of Michigan State University would be contracted to select wells for potential sampling. The MDHHS will work with the Washtenaw County Health Department to perform the sampling.
- March 7 - EGLE received recommendations from Dr. Hyndman of Michigan State University for sampling at seven residential homes in the vicinity of the Daimler Chrysler Scio site.
- March 9 - EGLE received a status report from the Brighton WWP providing sample results showing low PFOS in the collection system, industrial user effluent, and WWTP influent but WWTP effluent exceeding water quality standards. The City of Brighton reporteds that there could be a buildup of PFOS in their WWTP dosing cell and sand filters.
- March 17 - Sampling of residential wells in the vicinity of the Daimler Chrysler Scio facility delayed due to problems related to sampling during the COVID-19 forced shut-down.
- March 23 - The effluent from the Wixom WWTP was 16 ppt for PFOS.
- March 24 - EGLE published a staff report "Investigation of the Occurrence and Source(s) of Per- and Polyfluorinated Substances (PFAS) in the Huron River Watershed July 2018-December 2019".
- April 1 - EGLE received results from Polar Organic Integrative Sampler (POCIS) membrane PFAS analysis from ten sites in Norton Creek, Willow Run, and the Huron River. EGLE is working on a summary report of the data.
- April 8 - The DNR issued contract for the research project, "Fate, Transport, and Bioaccumulation of PFAS in the Huron River Watershed."
- April 14 -- The effluent from the Wixom WWTP was 12 ppt for PFOS.
- April 16 - EGLE approved a proposal from Daimler Chrysler Scio facility to conduct a feasibility study for elimination of PFAS discharge to the Huron River.
- May 11 - EGLE staff met to discuss potential sources of PFAS to Portage Lake and tributaries to Portage Lake.
- May 13 - The effluent from the Wixom WWTP was 17 ppt for PFOS.
- May 16 - EGLE received results for fish collected on September 26, 2019, from Ore Lake.
- May 20 - EGLE received a report from the City of Dexter showing that its industrial user PFOS source had reduced PFOS to <1.92 ppt. Dexter WWTP effluent has remained below WQS.
- June 4 - EGLE collected fish and surface water from Argo Pond in Washtenaw County.
- June 11 - EGLE and the MDHHS provided an update via a webinar for local units of government, local health departments, and other stakeholders on PFAS findings and activities in the Huron River Watershed.
- June 14 - EGLE collected fish and surface water samples from Kent Lake in Oakland County.
- June 23 - The effluent from the Wixom WWTP was 29 ppt for PFOS.
- June 26 - EGLE received surface water PFAS results collected from Argo Pond on June 4, 2020. PFOS was 1.98 ppt.
- July 9 - EGLE received surface water PFAS results collected from Kent Lake on June 14, 2020. PFOS was 3.9 ppt.
- July 21 - The effluent from the Wixom WWTP was 51 ppt for PFOS.
- July 22 - EGLE received the investigation report from TRC regarding additional PFAS investigation at the former Daimler Chrysler Scio site. Twelve additional groundwater samples, one surface water sample, and samples at two locations from the potable well on-site used to service the current facility were collected. The results from the groundwater samples were used to further delineate the extent of PFOA and PFOS present at the site above drinking water and/or GSI criteria. This delineation is now largely completed. The results from the surface water sample was used to demonstrate a connection between shallow groundwater and surface water at the site via evaluation of geochemical signatures of the shallow groundwater and the surface water at the site, One of the two samples from the on-site potable well had PFOS detected at 1.9 ppt, the other sample was non-detect; therefore, all of these results are below all current drinking water criteria.
- July 23 - EGLE published a staff report "Investigation of the Occurrence and Source(s) of Per-‑ and Polyfluorinated Substances (PFAS) in the Huron River Watershed Using Polar Organic Chemical Integrative Samplers (POCIS)" (MI/EGLE/WRD-20-020). The report summarizes POCIS sampling that occurred in September and October 2019. The results suggest that there are potential sources of PFAS in Norton Creek and Willow Run with significantly higher concentrations of PFOS in these two tributaries (this supports previous surface water sampling data). Please see the full report for additional details.
- July 26 - EGLE collected fish and surface water from Ford Lake in Washtenaw County.
- August 3-4 - EGLE collected surface water samples from the following areas: Huron River, Norton Creek, South Ore Creek, Portage Lake tributaries, Honey Creek in Washtenaw County, Willow Run, Washago Pond, and three lakes not connected to the river (Silver, Mirror, and Fonda). See June-August 2020 status update for more details.
- August 12 - EGLE received surface water PFAS results collected from Ford Lake on July 26, 2020. PFOS was 3.6 ppt.
- August 13 - EGLE collected fish and surface water samples from Base Line Lake in Livingston and Washtenaw Counties and fish from Kent Lake in Oakland County.
- August 20 and 24 - EGLE received results from August 3 through -4, 2020, surface water sampling. Samples collected from Norton Creek, Willow Run, and Washago Pond (on Regan Drain in Willow Metropark) exceeded the WQS for PFOS. PFOS concentrations in Norton Creek have continued to decline since July 2018 when it was first observed at 5,600 ng/L. Samples collected from Portage Lake tributaries were below the WQS for PFOS. Samples collected from Honey Creek (Washtenaw County) were below the WQS for PFOS. Additional source-tracking work is ongoing in Willow Run and the Regan Drain (Washago Pond). See June-August 2020 status update for more details.
- August 24 - EGLE received a quarterly effluent monitoring report from the Ann Arbor WWTP with results of 3three ppt PFOS. WWTP effluent has remained below four ppt since August 2019.
- August 25 - EGLE collected fish and surface water from the Flat Rock Impoundment on the Huron River and Regan Drain (Washago Pond in the Willow Metropark) in Wayne County.
- August 26 - EGLE received surface water PFAS results from August 13, 2020, collection at Base Line Lake. PFOS was 4.8 ppt.
- September 8 - EGLE collected fish from Argo Pond in Washtenaw County.
- September 14 - EGLE received results from August 25, 2020, follow-up surface water sampling in the Washago Pond (Willow Metropark) area. Two samples from Regan Drain (in Washago Pond and upstream of Washago Pond) exceeded the PFOS WQS and confirmed the previous elevated result in Washago Pond. See June-August 2020 status update for more details. Source-tracking in Regan Drain is ongoing.
- September 18 - After being informed in late August by EGLE staff regarding the findings at the 1279 Rickett Road site, EGLE received an IPP PFAS Status Report from the Brighton WWTP that outlined plans to sample 3three areas near the site to investigate whether contaminated groundwater could be infiltrating into the sanitary sewer. The report listed PFOS in WWTP final effluent on August 11, 2020, as 25 ppt PFOS.
- September 24 - EGLE staff met to discuss potential sources of PFAS to Regan Drain and Washago Pond in the Willow Metropark.