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Thomes Avenue Mercury Spill

 
Site Contact:
Paul Peronard
On-Scene Coordinator

(peronard.paul@epa.gov)

Site Location:
Intersection of W. 5th St. and Thomes Ave
Cheyenne, WY 82007
 response.epa.gov/ThomesAveMercurySpill

Click here for an interactive Story Map that shows the response efforts conducted at the Thomes Avenue Mercury Spill Site.

Interactive Story Map



The Wyoming DEQ contacted EPA to report that there are beads of mercury spread over a city street near the intersection of West 5th Street and Thomes Avenue in Cheyenne, Wyoming. The beads are spread over approximately 100 yards of the street, including immediately adjacent to a storm drain. The storm drain leads to Crow Creek.


EPA START contractor monitoring for mercury along drainage. EPA START contractor sampling towards Crow Creek for mercury. EPA START contractor sampling downstream in Crow Creek for mercury. EPA START contractor monitoring for mercury in storm drain. Sample containers drawn from Crow Creek. Sample containers drawn from along Crow Creek. EPA contractor monitoring for mercury along drainage. Location of mercury spill at W 5 St and Deming Dr EPA response truck on site. EPA ERRS contractor vacuuming up visible mercury in the background. Visible mercury seen along drainage. EPA ERRS contractor vacuuming visible mercury. Vacuum operations removing visible mercury. EPA START contractor monitoring opposite side of street from spill area. Visible Mercury Screening drainage area after vacuum operations and Mercon-X application Pipe completely removed. Excavated to about 5 ft bgs. Elevated Hg reading observed from hole. Vac truck excavation of Manhole 02 (MH02) Cheyenne Board of Public Utilities jackhammering/removing valve box at Manhole 02 (MH02) START personnel screening the Vac truck air filters for mercury vapors after it had been used to clean out a valve box. No mercury was detected Spill source post removal MH02 Post removal screening Groundwater infiltrating MH-02 excavation Screening vac truck Soil stockpile Covered soil and drums for disposal. Vac truck Cap to MH-01. Log book used for scale. Utilities view from NW corner of intersection BHE utility marking View toward spill area Utilities Utilities view from NE corner of intersection Intersection of W 5 St and Thomes Ave Cap on MH-03 and view toward spill area
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