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WP017 - Inactive Oxidation Ponds

One of Several Oxidation Ponds

The Oxidation Pond Site (WP017) is located in the southern part of the North/East/West Industrial Operable Unit and consists of a series of oxidation ponds that supported a former sewage treatment plant from the 1950's to the late 1970's. The treatment plant processed both domestic and industrial wastes until the late 1970's, when wastes were transferred to the Fairfield-Suisun Sewer District for treatment. Ponds along the southern base boundary were used from the late 1970's to 1990 for the burial of construction material, old tires, paint and oil containers, and landscape debris. Three northeastern ponds are currently used as overflow for the sewage transfer station.

PCBs, metals and pesticides were detected in soil at this site.  Based on human health and ecological assessments of the potential risks posed by the contaminants, the North/East/West Industrial Operable Unit Soil, Sediment, and Surface Water Record of Decision selected No Action for the soil at this site. Since there are no other media of concern associated with the Oxidation Pond site, it is a closed site.