Facility Site ID: 695 Cleanup Site ID: 1140

Independent Cleanup Complete

Cap surface from the south
Cap surface from the south
The Sparks & Buttercup Subdivision site was a non-permitted landfill from approximately 1928 until 1960. Household garbage, construction debris, scrap metal, and other types of debris were buried here. The site remains undeveloped.
 
Soil and groundwater samples were collected from the site in 1991. Petroleum products, 4,4 dichloro-diphenyl-trichloroethane (DDT), antimony, arsenic, barium, beryllium, cadmium, chromium, lead, mercury, nickel, and zinc were all detected in soil at levels requiring cleanup.
 
In 1992, Kleinfelder, Inc., conducted a subsurface investigation to address groundwater contamination. Groundwater was found between 56 and 121 feet below the ground surface in three monitoring wells. Arsenic, chromium, and lead were found in soil samples collected between 24 and 29 feet during the installation of these wells. DDT, lead, arsenic, and chromium were found at levels requiring cleanup in groundwater samples collected from two of the monitoring wells. 
 
A landfill gas survey was also done at this time. Six landfill gas probes were installed in and around the landfill and sampled for two days. These samples did not detect combustible gas in either the landfill or in near-surface soils surrounding the landfill.
 
In 1995, two more groundwater monitoring wells were installed north of the landfill boundary. These wells were monitored four times a year for total petroleum hydrocarbons (TPH), pesticides, polychlorinated biphenyls (PCBs), arsenic, chromium, and lead. Also, gas vapor monitoring was done again at six locations around the perimeter of the site to determine if any landfill gas was being emitted. These samples did not detect combustible gas in either the landfill or in near-surface soils surrounding the landfill.
 
Sample results from the two years of groundwater monitoring did not detect pesticides, PCBs, TPH, or metals at levels requiring cleanup.
 
The landfill was covered with a one-foot protective cap of clean soil. The soil was covered with a plastic liner and an additional 1.5 to 2 feet of topsoil. New grass was planted on the topsoil. Additionally, a groundwater compliance monitoring program was started in 1993 to assure the protection of groundwater.
 
A restrictive covenant was filed that limits how the property may be used. Ecology then issued a no further action letter stating that cleanup is complete.

Periodic Reviews

Periodic reviews were completed for this site in 2008, 2014, and 2019. Petroleum products, pesticides, and metals in soil continue to exceed state standards. The protective cap prevents human exposure to the remaining contaminants by eliminating potential ingestion or direct contact. The restrictive covenant for the property ensures that the cap will be protected. 

Site use restrictions called institutional controls are in effect

Institutional controls can be fences, signs, or restrictions on how the property is used. For instance, an institutional control may prohibit installing drinking water wells or disturbing a protective cap that isolates contamination. These restrictions keep the contamination contained and keep people from being exposed to the contamination. The controls are usually listed in environmental covenants recorded with the county.

Periodic reviews are required when institutional controls are required at a site. Ecology conducts reviews to make sure the controls remain effective and the cleanup still protects human health and the environment. We conduct periodic reviews about every five years.

Environmental Covenant

County Recording #: 4004878
County Recording Date: 5/16/1996

Restrictions/Requirements

  • Ongoing Maintenance of Remedy
  • Prohibit Soil Disturbance
  • Restrict Land Use

Restricted Media

  • Soil
Legal 1
Document Title Document Date Document Type
Sparks and Buttercup Subdivision Restrictive Covenant 5/16/1996 Environmental Covenant; Alternative Mechanism
Technical Reports 5
Document Title Document Date Document Type
Spark & Buttercup Subdivision- Annual Inspection 11/15/2020 Site Specific Technical Document - other
Third Periodic Review: Sparks & Buttercup Subdivision 10/18/2019 Periodic Review (5 Year)
Sparks and Buttercup Subdivision Periodic Review 2014 5/30/2014 Periodic Review (5 Year)
Sparks and Buttercup Subdivision Periodic Review 10/1/2008 Periodic Review (5 Year)
Sparks & Buttercup Subdivision- Independent Remedial Action Report 7/25/1994 Site Specific Technical Document - other
Voluntary Cleanup Program 1
Document Title Document Date Document Type
Sparks & Buttercup Subdivision- IRAP Opinion on Site Cleanup- No Further Action 6/24/1996 VCP Opinion on Site Cleanup – NFA
There may be more documents related to this site. To obtain documents not available electronically, you will need to make a public records request.

Places to see print documents

  • Eastern Regional Office
    N 4601 Monroe St
    Spokane, 99205-1265
    Please schedule an appointment to view print documents at this location.

Contaminants 3

Contaminant Type
Soil
Groundwater
Surface Water
Air
Sediment
Bedrock
Metals - Metals Priority Pollutants C
Non-Halogenated Organics - Petroleum Products-Unspecified C
Pesticides - Pesticides-Unspecified C
S
Suspected
C
Confirmed Above Cleanup Levels
B
Below Cleanup Levels
RA
Remediated-Above
RB
Remediated-Below
R
Remediated
This contaminant list was based on our best information at the time it was entered. It may not reflect current conditions at the site.