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jasonthorsness 19 days ago  [ - ]

Seattle’s Gas Works Park has some strange equipment to address the benzene contamination. Bold move to make industrial sites into parks (it is one of the best in Seattle though!)

Edit: better link https://apps.ecology.wa.gov/cleanupsearch/site/2876

Original link was older 2005 report: https://apps.ecology.wa.gov/cleanupsearch/document/1509

robocat 19 days ago  [ - ]

Relevant sections from the 2005 report:

  3.1 Benzene. On the east side of the Park, south of the Play Barn the groundwater is contaminated with benzene. An interim action removed a benzene containing LNAPL that had been discovered during site investigation. The remedy chosen for benzene was an air-sparging/soil vapor extraction (AS/SVE). The AS/SVE system covers approximately 1.5 acres of the Park. It is unnoticeable to Park users except for a small equipment box near the Towers. . An action level was calculated based on MTCA Method B surface water criteria and a dilution attenuation factor (DAF). The calculation used to set the DAF and the action level for benzene is given in appendix 1.

  4.1 Benzene. Benzene concentration in the compliance well OBS-1 remains below the action level but above the method B groundwater cleanup level. The remedy, therefore, remains effective. See figure 3 below.