Wolfkill Feed and Fertilizer Royal City

The Wolfkill Royal City property is now owned by Cenex Harvest States (CHS) and is used for storing, mixing, and distributing herbicides and pesticides. The site has an office building, a large storage building, two small wood storage buildings, and a maintenance shop and equipment storage building. Five above-ground storage tanks are next to one of the small wood storage buildings. The tanks contained chemicals used for agricultural purposes.
 
Investigations found elevated levels of nitrate and ammonia at the dry fertilizer loading area. Groundwater samples had nitrate at levels requiring cleanup.
 
Contaminated soil was removed and spread over land to reduce it to levels that meet state regulations. Groundwater monitoring wells were installed and samples were taken over a period of time. Nitrate is the only contaminant that is still higher than state standards.
 
A restrictive covenant was placed on the property because nitrate levels continue to exceed state standards. The covenant prohibits pumping contaminated groundwater for domestic use and limits any activities that might interfere with the cleanup or create an exposure to humans or the environment.

Ecology has completed two periodic reviews for this site. The first in 2009 and the second in 2015. Both times we found that the cleanup remains effective and contaminated groundwater is not being used.