Landmark Care Center
Site Description
Cleanup Activities
All media suspected of having residual concentrations of agricultural chemicals could be effectively used on-site for fill material. Preliminary investigations on behalf of the owner indicated that site soil should be suitable for compaction. Considering probable duration of historical application of chemicals at this site (~1930 - 1970), observed depth of maximum downward migration of residual chemicals is consistent with predicted low leachability of metals in soil. Given the low mobility of chemicals and the distance to groundwater at this site, managing soils onsite will effectively prevent groundwater impact.
At completion of site grading and construction, soils not covered by impermeable capping material (asphalt or building footprint) were capped with clean topsoil and vegetation or landscaping. Confirmation of remediation was verified by sampling of surface capping material. Post-remediation arsenic analysis documented one area in the upper 6 inches above the selected remedial threshold. Post-remediation arsenic statistical analysis had a mean site value of 7.42 milligrams per kilogram (mg/kg), a range of 2.2 to 29.5 mg/kg, and an upper confidence level of 9.73 mg/kg.
Because contamination was capped at the site at concentrations exceeding Model Toxics Control Act (MTCA) Method A cleanup levels, institutional controls were required for the site to be eligible for a no further action determination. An environmental covenant was recorded for the site in 2010.
Cleanup Complete
Based upon cleanup activities and the recording of the environmental covenant, Ecology has determined the site is no longer a threat to human health and the environment. Ecology issued a no further action determination in May 2010.
Periodic Review
Periodic reviews are conducted every 5 years by Ecology for sites that have institutional controls. The review is intended to examine the effectiveness of cleanup activities and to assure the continued protection of human health and the environment.
Periodic review results
Based on site visits conducted in 2010, 2015, 2021, the cleanup actions completed at the site are protective of human health and the environment.
Soil cleanup levels have not been met at the site; however, the cleanup action is determined to comply with cleanup standards under WAC 173-340-740(6)(f), since the long-term integrity of the containment system is ensured and the requirements for containment technologies have been met.
The environmental covenant for the property is in place and will be effective in protecting public health and the environment from exposure to hazardous substances and protecting the integrity of the cleanup action.
Based on the periodic reviews, Ecology has determined that the requirements of the covenant are being followed. No additional remedial actions are required by the property owner. It is the property owner’s responsibility to continue to inspect the site to assure that the integrity of the cap is maintained.
Voluntary Cleanup Program
This site was cleaned up under our Voluntary Cleanup Program, which provides technical help to owners of contaminated sites.
Voluntary Cleanup Program customers pay fees to cover our costs for technical help and reviewing cleanup reports. Sites in this program must meet the same cleanup standards as the sites Ecology manages under legal orders.
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.
Institutional Controls 1
Environmental Covenant
Restrictions/Requirements
- Ongoing Maintenance of Remedy
- Prohibit Soil Disturbance
- Restrict Access
- Restrict Land Use
Restricted Media
- Soil
Documents 6
Legal 1
Document Title | Document Date | Document Type |
Landmark Care Center RC | 5/12/2010 | Environmental Covenant; Alternative Mechanism |
Technical Reports 4
Document Title | Document Date | Document Type |
Landmark Care Center - Notice of 3rd Periodic Review | 11/15/2021 | Site Specific Administrative Document - other (Administrative correspondence) |
Landmark Care Center 2021 Periodic Review | 4/1/2021 | Periodic Review (5 Year) |
Landmark Care Center 2015 Periodic Review | 7/1/2015 | Periodic Review (5 Year) |
Landmark Care Center 2010 Periodic Review | 2/22/2010 | Periodic Review (5 Year) |
Voluntary Cleanup Program 1
Document Title | Document Date | Document Type |
Landmark Care Center NFA letter | 5/24/2010 | VCP Opinion on Site Cleanup – NFA |
Places to see print documents
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Central Regional Office1250 W Alder StUnion Gap, 98903-0009Please schedule an appointment to view print documents at this location.
Contaminants 3
Contaminant Type | Soil |
Groundwater |
Surface Water |
Air |
Sediment |
Bedrock |
---|---|---|---|---|---|---|
Pesticides - Halogenated Pesticides | RA | |||||
Metals - Arsenic | RA | |||||
Metals - Lead | RA |
- S
- Suspected
- C
- Confirmed Above Cleanup Levels
- B
- Below Cleanup Levels
- RA
- Remediated-Above
- RB
- Remediated-Below
- R
- Remediated