WASATCH CHEMICAL CO. (LOT 6)
SALT LAKE CITY, UT
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The 18-acre Wasatch Chemical Co. (Lot 6) site is located in Salt Lake City, Utah. From 1957 to 1971, Wasatch Chemical Company used the area to warehouse, produce and package industrial chemical products. Between the 1970s and 1992, site operations included blending and packaging pesticides, herbicides, fertilizers, industrial chemicals and cleaners. The company also discharged wastewater into on-site tanks, evaporation ponds and onto the ground. These activities contaminated soil, sludge and groundwater with hazardous chemicals. Following cleanup, operation and maintenance activities are ongoing.
What Has Been Done to Clean Up the Site?
The site is being addressed through potentially responsible party (PRP) actions.
EPA has conducted several five-year reviews of the site’s remedy. These reviews ensure that the remedies put in place protect public health and the environment, and function as intended by site decision documents. In the most recent review, EPA deferred making a protectiveness statement until additional information can be obtained. This information will be obtained by additional sampling and analysis to fully determine the potential for vapor intrusion at the site, and a dioxin toxicity reassessment.
What Is the Current Site Status?
The long-term remedy included excavation of contaminated soil and sludge; consolidation of the contaminated soil and sludge in the former evaporation pond; treatment of consolidated soil, sludge and dioxin-removal wastes; excavation and landfarming of hydrocarbon-contaminated soil; groundwater extraction and treatment; and institutional controls. Remedy construction took place between 1992 and 1997.
In 2003, groundwater extraction and treatment was discontinued and monitoring of natural attenuation processes began. In May 2004 and July 2006, enhanced biodegradation (implementation of a hydrogen-reducing compound to enhance natural attenuation of chlorinated hydrocarbons) activities began. Groundwater monitoring is ongoing.
Currently, an investigation by the site’s potentially responsible party (PRP) is assessing shallow soil and deep groundwater contamination.
Site cleanup has also included removal actions, or short-term cleanups, to address immediate threats to human health and the environment. Removal actions in 1986 included removal of 50 drums, cylinders and other containers of chemical waste, and temporary on-site storage of several drums of dioxin-containing waste.