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Key II Industrial Building (Elk Rapids, Antrim County)

EGLE Site Lead: Christiaan Bon, or 989-370-9624. Webpage last updated: July 16, 2021.


Key II Industrial Building is located at 603 Bridge Street.  From the 1950s to the 1980s, the site was used as a tool and die shop. Afterwards, it was an antique shop and retail facility until late 2020. Since then, it has operated as a watercraft sale and rental facility.  EGLE reviewed a Baseline Environmental Assessment (BEA) on June 28, 2021 that was conducted for potential redevelopment of the property. Two temporary monitoring wells had concentrations of PFAS exceeding groundwater cleanup criteria (indicated by yellow highlights below).  Monitoring well TW-6 exceeded groundwater cleanup criteria for PFOS and PFOA and groundwater surface water interface (GSI) criteria for PFOS.  Monitoring well TMW-4 exceeded GSI criteria for PFOS.  

Groundwater flow is to the east towards Elk Lake.

Key II Industrial Building Map

Residential Well Testing/Alternate Water Information

  • Municipal water is available. There are no shallow private wells downgradient from this site.

Sampling Results


TMW-6 (ppt)

TMW-4 (ppt)

PFOA 26 Non-Detect
PFOS 160 13
PFOS-LN 120 Non-Detect
PFOS-BR 36 Non-Detect
PFPeA 11 Non-Detect
Other PFAS Non-Detect Non-Detect


Groundwater monitoring well results are compared to EGLE Part 201 criteria for 7 PFAS compounds effective 12/21/2020:  PFOS (16 ppt), PFOA (8 ppt), PFNA (6 ppt), PFHxS (51 ppt), PFHxA (400,000 ppt), PFBS (420 ppt), and HFPO-DA (370 ppt). 
Groundwater Surface Water Interface Criteria is compared to Rule 57 non-drinking water values of 12 ppt for PFOS and 12,000 ppt for PFOA.