The gasification plant of Seattle Gas Light Company was built 1906.
Its primary product was coal gas used for lighting, cooking, refrigeration, and heating homes and water.
The plant ceased production of coal gas in 1956 when Seattle converted to natural gas.
Instead of removing the contaminated soil, Haag decided to deal with it by using natural microbes and sewage.
Haags bio-remediation approach worked, but only to some extent.
Occasionally, tar still oozes from some locations within the site and is isolated and removed.
The park was for many years the exclusive site of a summer series of “Peace Concerts.
The park also has for many years hosted one of Seattle’s two major Fourth of July fireworks events.
In 2013, the park was added to the National Register of Historic Places.
Sources:Wikipedia/The Cultural Landscape Foundation/City Living Seattle
