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7 IJ Consent Decree Exhibit C about 25 to 30 feet thick. The transitional beds are underlain by medium dense to very dense, slightly silty to clean sand. Two manmade perimeter drainage ditches, the East and West Ditches, are within the Site boundary. The East Ditch, recently classified as a Category III wetland (Associated Earth Sciences, Inc., 2000), discharges through culverts into the Snohomish River. An additional ditch, the Mid -East Ditch, is located between the two eastern railroad tracks and is not within the Site boundary. An elevated railroad ballast separates the two ditches. The Mid -East Ditch does not directly receive runoff from the landfill. The Mid -East Ditch has been classified as a Category I wetland due to its hydrological connection to the off -site Category I wetlands located between the most easterly BNSF tracks and the Snohomish River, east of the Site. Ponded water exists in the southern point of the triangular Site, outside the landfill security fence. The ponded water is bounded on the west by the BNSF "turkey" track, on the east by the westernmost of the two eastern tracks and to the north by the southern slope of the landfill. This ponded water discharges into the East Ditch. There are tiree inflows to this pond: 1) a large upland off -site watershed, 2) the West Ditch, and 3) a culvert near the intersection of the BNSF tracks. 2.2 SITE HISTORY Over the years, the Site was used as a burn dump, a scrap metal recycling and burial yard, and a municipal landfill. The southern portion of the Site was the last active fill area, and November 1974 was the last month that waste was received. The next year, the entire landfill was graded and closed in compliance with the then current Regulations Relating to Minimum Functional Standards for Solid Waste Handling (WAC 173-301) and a 12-inch soil layer was placed over the waste and seeded. In 1977, a commercial recycling operation began storing and handling old rubber tires within the central and eastern half of the landfill. Subsequently, two separate fires occurred in the tire piles — one in 1983 and one in 1984. The residue and ash from these fires caused Ecology to request the City perform an environmental characterization of the tire fire ash. The City conducted a preliminary assessment in 1985 and a Remedial Investigation and Feasibility Study (RI/FS) in 1986. The Site was listed in 1989 under the newly enacted Model Toxics Control Act because of concerns relating to the Tire Fire ash. Subsequent regulatory actions and interim and independent cleanup actions implemented to address concerns at the Site are described in Section 2.4. 2.3 EXISTING FACILITIES AND UTILITIES I Currently, three separate facilities operate on the Site: the City of Everett Animal Shelter (Animal Shelter), the City of Everett General Maintenance and Storage Facility (City Yard), and the Everett Recycling and Transfer Station (Transfer Station) operated by Snohomish County. The only access to the Site is from 36th Street East, an existing city road that provides access to both the facilities on the landfill and industrial properties to the north. FINAL - March 2001 2-2 Everett Landfill Tire Fire Site Cleanup Action Plan 1