Casper PCE Plume

 

The Casper Perchloroethylene (PCE) Plumes orphan site is approximately 150 acres in an area that is bound to the north by the North Platte River, to the south by the Yellowstone Highway, to the west by Elm Street and to the east by Washington Street.  The area is comprised of residential, commercial and industrial neighborhoods.  Environmental testing in the late 1980s and early 1990s revealed the presence of PCE in groundwater at three locations in downtown Casper and two locations in North Casper and in the indoor air of some homes.

 Casper PCE Plumes Orphan Site is one of the high priority orphan sites on the Wyoming Department of Environmental Quality (DEQ) list.  New regulatory standards for PCE and updated technology for testing vapor intrusion, along with newly available funding for the DEQ, is the rationale for this additional investigation into the Casper PCE Plumes Orphan Site.


DEQ Project Manager:  Matt Buchholz, phone:  (307) 777-8937, email: matt.buchholz@wyo.gov    


Public Notice and News:

  • Site Update I - Oct 2009

  • Site Update II - Feb 2010

  • Public Meeting Announcement, Casper Star Tribune - Feb 17, 2010

  • DEQ Releases Water Results, Casper Star Tribune - Feb 18, 2010

  • Officials Say Drinking Water is Not Affected, Casper Star Tribune - Feb 22, 2010

Site Investigation Updates:

  • October 2009:  Public notice regarding pending environmental investigation was given using mailings to residents within the study area and newspaper notices in the Casper Star Tribune. Site investigation began with sampling existing groundwater supply wells.

  • November - December 2009:  DEQ installed 10 (7 shallow and 3 deep) groundwater monitoring wells and 40 soil vapor sampling points throughout the study area.

  • February 2010:  Public notice with the results of the preliminary environmental investigation, path forward and public meeting was given using mailings to residents within the study area and newspaper notices in the Casper Star Tribune.  A public meeting was held at the University of Wyoming Outreach Center on the 18th to notify residents of site investigation results and the path forward.

  • March 2010 – April 2010:  DEQ tested indoor air and subslab soil gas at potentially affected properties.

  • June 2010– December 2010:  The site investigation of groundwater and soil vapor was expanded to further delineate the contaminated groundwater and soil vapor plumes.

  • February – March 2011:  DEQ tested indoor air and subslab soil gas at potentially affected properties.

  • June 2010 – Current:  DEQ installed or will install indoor air mitigation systems at residences and commercial buildings within the study area.

  • August 2011:  Completed installing mitigation systems.

  • August 2011:  Installed additional groundwater monitoring wells along the river and north edge of North Casper to further delineate groundwater plume.

  • May 2012: Completed Site Investigation Report for work that began in 2009.

  • Spring 2014: Further investigation of source areas to help with development of the Remedial Alternatives Evaluation Report.

  • Fall 2016: Begin planning for remedy implementation

 

 


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