- Groundwater Characterization and Investigation
- Landfill Gas Monitoring
- Remedial Investigation and Feasibility Study
The Olalla Landfill is a small municipal solid waste landfill owned by Kitsap County Public Works (KCPW) that is located approximately 0.75 miles east of Highway 16 at the intersection of SE Burley-Olalla Road and Bandix Road in Kitsap County. The parcel contains the landfill and contains the adjacent Olalla Recycling and Garbage Facility, which was never used as a landfill and was established as a transfer station at the time the landfill stopped accepting waste in 1988.
The landfill was officially closed in 1989 in accordance with the Olalla Final Closure Plan. Post-closure activities have been ongoing since closure of the landfill. Post-closure activities consist primarily of quarterly monitoring and maintenance per Washington Administrative Code (WAC) 173-304-407 (Minimum Functional Standards for Solid Waste Handling), “General Closure and Post Closure Requirements,” Kitsap County Board of Health Ordinance 2004-2 and 2010-1, “Solid Waste Regulations,” and Post Closure Solid Waste Handling Permits issued annually by Kitsap Public Health District (KPHD).
EPI also performed a Remedial Investigation/Feasibility Study (RI/FS) for the landfill, which included installing, developing, and sampling two additional downgradient monitoring wells, which required building a gravel road to allow access, temporarily plugging the landfill gas flares and obtaining representative landfill gas samples, performing a test pit investigation to evaluate the nature of material contained in one of the landfill’s two cells, sampling off-site water supply wells, and developing two additional surface water monitoring locations.