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Henley's Sealant

Site Contact:
Mike McAteer
On-Scene Coordinator


Site Location:
200 North Wisconsin
Oklahoma City, OK 73117

The Henley’s Sealants Site is located at 200 North Wisconsin Avenue in Oklahoma City Oklahoma County, Oklahoma. The Site was formerly the W. R. Grace Zonolite vermiculite expansion facility. Records indicate vermiculite exfoliation was occurring at the site as early as 1957. The property was purchased by Texas Vermiculite Company on January 3, 1977. There is no available documentation as to the site operations conducted by Texas Vermiculite; however, it is likely that Texas Vermiculite conducted vermiculite exfoliation at the site as records indicate that the facility accepted approximately 113, 905 tons of raw vermiculite between 1967 and 1988, from the WR Grace mine located in Libby, Montana. The date that Zonolite/WR Grace began vermiculite exfoliation at the site is not known; however, WR Grace ceased operations at the facility in 1991 or 1992. WR Grace Company sold the facility to Henley’s Sealants Incorporated in 1994.

EPA’s removal evaluations were conducted at the Site in response to an Agency-wide initiative to investigate current and former vermiculite facilities that received vermiculite ore from the W.R. Grace vermiculite mine in Libby, Montana.

There are two phases of cleanup for the Henley Site. Phase 1 was conducted by EPA in 2010-2011 and activities focused on areas of contamination west of MLK Blvd. Phase 2 activities started in August of 2017 and will continue through early 2018. Phase 2 activities will focus on those areas east of MLK Blvd.

This removal action addresses the need to mitigate the potential threats posed by asbestos contaminated soils located on-site from the processing of vermiculite ore and the disposal of associated waste products at this Site by W.R. Grace/Zonolite Co.

For additional information, visit the Pollution Report (POLREPS) section.