Cheyenne PCE Plume
The Cheyenne Perchloroethylene (PCE) Plume orphan site is an area approximately 20 acres in size within a roughly 5 block by 3 block area of downtown Cheyenne, Wyoming. The site is centered 1 block directly west of the Herschler Building, 122 West 25th Street, Cheyenne and consists of a mixture of single and multi-home residential properties, government buildings, and commercial businesses. The chlorinated solvent contamination was first discovered in soil and shallow groundwater (5 to 15 feet below ground surface) following a Limited Subsurface Investigation conducted in December 2002 by ERM on behalf of the former Safeway Store located at 2512 Pioneer Ave, Cheyenne.
Wyoming Department of Environmental Quality (DEQ) Project Manager:
Jaymee Binion, Project Manager, 307-777-7541, firstname.lastname@example.org.
February 17, 2010 held at the Herschler Building, 122 West 25th Street, Cheyenne, WY
Site Investigation Update:
- October 2009: Site investigation began with the sampling of existing groundwater supply wells and sumps
- November -December 2009: The DEQ installed 17 groundwater monitoring wells and 44 permanent soil vapor sampling points throughout the study area
- January 2010: Public notice was initiated using mailings to residents within the study area and newspaper notices
- February 2010: A public meeting was held at the Herschler Building, Cheyenne on the 17th to notify residents of site investigation results
- March 2010: The DEQ began indoor air testing of potentially affected properties (43 locations)
- May 2010: Installation of indoor air mitigation systems began (12 properties)
- July 2010: The site investigation of groundwater and soil gas was expanded along the western edge of the study area, and source investigation into an abandoned underground storage tank was begun
- February - May 2011: DEQ continued indoor air testing of potentially affected properties (27 additional properties)
- February - June 2011: Installation of indoor air mitigation systems continued (10 properties)
- July 2011: Site investigation of soil gas was further expanded along the western edge of the previous expanded area as well as to the south.
- November 2011: Completion of indoor air testing of potentially affected properties (4 additional properties)
- March 2012: Site Investigation Report completed. Initial site investigation activities completed. DEQ begins evaluation for additional investigation requirements and/or remediation of groundwater.
- Spring 2017: Anticipate development of a Remedial Alternatives Evaluation, including additional data collection as needed