MICA LANDFILL WASHINGTON EPA ID# WAD980511661

EPA Region 10 Spokane County Mica 5th Congressional District Other Names: Spokane Co Utilities Dept - Office, Spokane Co - Mica Landfill

Last Update: April, 2010

Site Description

The Mica Landfill site has been owned by Spokane County Utilities since 1972, and covers 65 acres near Mica, WA. Prior to 1991, the landfill was licensed by the State to handle hazardous, domestic, and industrial waste. Landfill operations ended in late 1991. Groundwater beneath the landfill is contaminated with volatile organic compounds (VOCs), heavy metals, and phenol. About 115 domestic water wells and two municipal wells are located within three miles of the site and serve approximately 4,000 people .

Site Responsibility: This site is being addressed through state and county actions.

NPL Listing History	Dates
Proposed Date:	10/15/1984
Removed Date:
Withdrawal Date:
Final Date:	06/10/1986
Deleted Date:

Threats and Contaminants

Media Affected: Groundwater, Soil & Sludges
Groundwater contains VOCs, heavy metals, and phenols. Leachate (liquid moving through the land fill masses) is contaminated with at least 20 regulated organic compounds along with inorganic ions and metals. People who might ingest or come into direct contact with contaminated groundwater and leachate might be at risk. The presence of explosive levels of methane gas generated at the landfill, represents additional threats to public health and the environment.


Cleanup Progress

Between 1991 and 1994, Spokane County constructed a number of leachate collection trenches and three leachate collection ponds. These ponds are pumped out as needed and the leachate is conveyed to a local plant for treatment and disposal. Later, a Remedial Investigation/Feasibility Study (RI/FS) was prepared by Spokane County pursuant to a Consent Decree with the State. In 1995, Spokane County finished building a permanent cover system with two impervious barrier layers and gas collection/treatment. The performance of the cover system was reviewed after five years of operation and it was determined to be operating effectively. A Cleanup Action Plan was completed in which the interim action was selected as the final remedy. Ground water monitoring will continue until cleanup levels are achieved. The cleanup action will be reviewed at least every five years. The site was designated construction complete on February 12, 2002.


Regional Contacts

SITE MANAGER(S):	Sandra Treccani (state)
E-MAIL ADDRESS:	satr461@ecy.wa.gov
PHONE NUMBER:	509-329-3412 Tim Brincefield (EPA contact) brincefield.timothy@epa.gov 206-553-2100
COMMUNITY INVOLVEMENT COORDINATOR:	Washington Department of Ecology
E-MAIL ADDRESS
PHONE NUMBER:

Information pertaining to this site is housed at the following location(s):
Washington Department of Ecology (Administrative Record)
Eastern Regional Office
4601 North Monroe Street, Suite 202
Spokane, WA 99205-1295

Spokane County - Utilities Division (Selected Documents)
1026 West Broadway Avenue
Spokane, WA 99260-0180

Spokane Public Library (Selected Documents)
906 West Main Avenue
Spokane, WA 99201-0976

Valley Public Library (Selected Documents)
12004 East Main Avenue
Spokane, WA 99206-5114