Meridian Campus Campus Glen

Location
Campus Glen Property is part of the 1,540-acre Meridian Campus Development in Lacey, Washington.

History
This 23-acre Property was scheduled for future development into single-family houses. Prior to 2015, this Property was undeveloped and forested.

Why did the Property need cleanup?
In 2005, soil testing found the surface soil contaminated with Arsenic and Lead.  This contamination is likely a result of air pollution from the former Asarco smelter in Tacoma. Air pollution from the smelter settled on the surface soil over more than 1,000 square miles of the Puget Sound basin. The contaminated area is known as the Tacoma Smelter Plume and is managed under the Asarco Tacoma Smelter Site.   Arsenic and lead in soil can cause adverse health effects with long-term exposure. Developers within the Tacoma Smelter Plume are encouraged to cleanup properties within the plume during residential development. Ecology provides free Technical Assistance to developers.

How was the Property cleaned up?
In June 2005, Landau Associates developed a cleanup action plan for the entire Meridian Campus Development.  The cleanup action plan selected soil mixing during development grading activities as a way to remediate the Tacoma Smelter Plume contamination. Ecology agreed with the plan for cleanup and issued an opinion letter in 2006.

In 2005, Meridian Campus Development Partners remediated the Property during its residential development. They removed the contaminated surface soil and placed it in a stockpile. The stockpile was then sampled and reused as fill on the Property.  Mixing contaminated soil with cleaner soil dilutes the concentration of arsenic and lead in the soil. Mixing is typically used when the concentrations of arsenic and lead are below a certain level. In this way, cleanup can be a part of development.  

How do we know if the cleanup was satisfactory?
In 2005, the developer joined the Voluntary Cleanup Program with Ecology, requesting an opinion on the cleanup of the Property.  They provided Ecology with a cleanup report containing the results of the soil sampling after the cleanup.

They sampled the stockpiled soil and the soil below the excavated areas. The arsenic and lead levels met the cleanup standards for unrestricted land use. The soil that was scraped off and stockpiled was sampled using the Tacoma Smelter Plume Model Remedies Guidance. The soil under the excavated areas was also sampled to make sure that the levels of arsenic were below state cleanup standards. Ecology determined that the Property was cleaned to satisfy state requirements and issued a No Further Action determination.  In 2005, Meridian Campus Development Partners started developing the Meridian Campus Glen Property into a single-family housing development.

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