Soil Contamination- Overview and Case Study. Christopher Lyles ESS 315. How soil becomes Contaminated. Urban runoff Agricultural runoff Mining Industrial Operations Atmospheric Deposition Contaminated Groundwater. Sources of Contamination. Gas Works Park. Gas Works Park.
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Previous site of coal and oil gasification (1900 to 1956)
Waste accmulations include: coal, tar, and oil
Polynuclear aromatic hydrocarbons (PAH’s )and volatile organic compounds (VOC’s) are present in groundwater
PCB’s, heavy metals, and cyanides also present
“Gas Works deposit” is as thick as 9 feet across the park and overlies the Vashon Till- consists of waste products from prior operations (
Developed by Seattle Parks and Recreation and subsequently studies by USGS and UW
…to become a superfund site (in 1980)
But polluted enough to cost tens of millions of dollars to clean up…
Puget Sound Energy and City of Seattle still continuing to monitor and clean the site
Naphthalene (Toxic/ non-carcinogenic)
PAHs (vary depending on type but can be both Toxic and Carcinogenic)
Air sparging/ Soil Vapor Extraction (AS/SVE)
Monitored Natural Attenuation (possible phyto-remediation to be used in future)
Direct Soil contact RemedyMain Concerns/ Remediation Techniques