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Herriman Asphalt Discharge

 
Site Contact:
Martin McComb
On-Scene Coordinator

(McComb.Martin@epa.gov)

Site Location:
Herriman, UT 84096
 response.epa.gov/HerrimanAsphaltDischarge
NRC#: 1430820

On May 11, 2025, Herriman City’s Stormwater Department notified the National Response Center that a tanker trailer containing a mixture of asphalt emulsion and butyl alcohol had discharged and affected Rose Creek. Rose Creek is a tributary of the Jordan River.

The discharge is being investigated by local officials as an act of vandalism. The vandalism caused approximately 400-600 gallons of material to be discharged from the tanker into a dirt parking lot. The discharged liquid then followed a stormwater pathway and entered Rose Creek. 

An EPA On Scene Coordinator (OSC) was deployed to the incident and arrived on-Site the morning of May 12, 2025.

The OSC integrated with Herriman City and the asphalt company's response contractor and established the following response objectives:

Response Objectives

  1. Ensure the safety of response contractors.
  2. Clear the surface of the parking lot and stormwater pathway of emulsified tar.
  3. Collect recoverable tar deposits from Rose Creek.
  4. Transition to continued remediation under authority of Utah DEQ.

These objectives were achieved on May 14, 2025 and EPA’s OSC demobilized from the Site.


Asphalt tar slurry was discharged to a parking lot / laydown yard during the vandalism. Asphalt tar slurry was discharged to a parking lot / laydown yard during the vandalism. Cap was pulled off the tanker and left on the ground by vandals during the discharge. Asphalt tar slurry remaining in the tanker. Approximately 7 Asphalt tar slurry remaining in the tanker. Approximately 7 Drainage channel leading to stormwater intake along the path that the discharge took to Rose Creek. Stormwater intake along the path that the discharge took to Rose Creek. Stormwater drainage box along the path that the discharge took to Rose Creek. Asphalt tar slurry on rip rapped outlet of stormwater culvert leading to Rose Creek. Asphalt tar slurry on rip rapped outlet of stormwater culvert leading to Rose Creek. Asphalt tar slurry on rip rapped outlet of stormwater culvert leading to Rose Creek. Asphalt tar slurry on land between the stormwater outlet and Rose Creek. Asphalt tar slurry on land between the stormwater outlet and Rose Creek. Asphalt tar slurry on land between the stormwater outlet and Rose Creek. Asphalt tar slurry on land between the stormwater outlet and Rose Creek. Asphalt tar slurry on land between the stormwater outlet and Rose Creek. Absorbent material placed by local Hazmat / Fire Department. Absorbent boom and pads placed in Rose Creek by PRP's response contractor as a precaution. Rose Creek as it flows downstream through Rosecrest Park. Looking upstream at Rose Creek from Rosecrest Park. Looking downstream at Rose Creek from Rosecrest Park. Rose Creek. Rose Creek. Looking upstream at Rose Creek from Rosecrest Park. Tanker of asphalt tar slurry which was vandalized after the product had been removed from the nearby soil. Parking lot / lay down yard where the discharge occurred after product had been removed. Banks of Rose Creek after contamination had been removed from below the stormwater spillway. Banks of Rose Creek after contamination had been removed from below the stormwater spillway. Banks of Rose Creek after contamination had been removed from below the stormwater spillway. Banks of Rose Creek after contamination had been removed from below the stormwater spillway. View of Rose Creek as it passes through culvert into a concrete settling pond AFTER tar slurry had been removed. This was furthest downstream extent of visible contamination witnessed by On-Scene Coordinator. View of Rose Creek as it passes through culvert into a concrete settling pond AFTER tar slurry had been removed. This was furthest downstream extent of visible contamination witnessed by On-Scene Coordinator. View of Rose Creek as it passes through culvert into a concrete settling pond AFTER tar slurry had been removed. This was furthest downstream extent of visible contamination witnessed by On-Scene Coordinator.