Base de données de recherche des TNO

étiquettes: contaminants, site remediation, water quality, geotechnical survey, soil chemistry

Objectif(s): To remove and dispose of exposed solid waste (including barrels, batteries, debris, wood, and other waste); and, construct a contaminated soil and waste containment structure on top of the existing buried waste area.

Description du projet: The 2016 Limited Site Investigations may include a Site reconnaissance to assess Site conditions, conduct maintenance, obtain water samples to determine water resources for the planned 2017 temporary camp, install a weather station, and obtain environmental soil and water samples as potentially required by regulators. The objectives of the Site Remediation Program are to: 1) remove and dispose of exposed solid waste (including barrels, batteries, debris, wood, and other waste); and, 2) construct a contaminated soil and waste containment structure on top of the existing buried waste area. The proposed 2016 activities would not require a camp to be set-up on Site and could include the following: Assessment of Water Supply – Samples may be collected from potential potable water supply locations (rivers, lakes). The water samples would then be analyzed for potable water quality and bacterial parameters. This will help in determining the requirements for water treatment. Weather Station - This may be installed to allow the team to monitor and communicate weather conditions at the Site. Environmental Sampling – This could involve any other sampling as requested by regulators. The proposed 2017 Site activities will include several investigations in support of the remediation program: Thermal Investigation – Four additional thermistors will be installed at different locations in the containment structure to facilitate permanent temperature monitoring at different depth intervals. Confirmatory Environmental Sampling - Previously delineated contaminated soil will be excavated from the active layer beyond the footprint of the containment structure and relocated directly on top of the left in-place impacted material. Confirmatory soil sampling will be performed after construction is complete. Topographic Survey – A high resolution topographic survey will be conducted at the containment structure and the borrow areas. It will capture the layout of ground control points for the UAV survey. The survey will also be used to determine the installation of permanent bench marks. UAV Survey Field Program – A low altitude UAV survey of the containment structure, the borrow areas and ground control points will be performed. The planned 2017 project intends to mobilize heavy equipment, materials and supplies, camp components and the field crew through Mould Bay to Satellite Bay to remediate the site. Two temporary camps will be established, one at each site. Remediation will include removing waste and debris currently at the site and constructing a contaminated soil and waste containment structure with a thermal cover at the site. The structure will measure approximately 8,500 m2 plus a 10 m wide buffer zone (resulting in a total of 12,500 m2). The thermal cover will provide a cap on the contaminated material that is sufficiently thick (approximately 2.4 m) to contain estimated seasonal thawing within the cap, thereby ensuring that all buried waste and contaminated soils remain at ground temperatures less than 0°C. The construction will also include the development and short-duration, operation of two borrow pits to source local material needed for building the containment structure, backfilling dewatered surface depressions areas and upgrading existing trails at the site. The duration of the planned 2017 project (construction portion) will be approximately eight weeks in July and August, however parts of the 2017 project could extend into 2018. Two temporary camps will be required. One eight-person, temporary emergency camp will be established at Mould Bay for the duration of the project. It is anticipated that this camp will not be utilized full time. One 24-person temporary camp will be established at Satellite Bay for approximately eight weeks during the field activities. Camp components will be transported from Mould Bay to Satellite Bay and what is not needed at Satellite Bay will be transported back to Inuvik once mobilization to Satellite Bay is complete. As in previous project-related research at the site, a follow-up report will be submitted to the Hunters and Trappers Committees of Sachs Harbour and Ulukhaktok, the Government of the Northwest Territories Lands Department and the Aurora Research Institute. This will include a plain language summary of investigation findings. The fieldwork for this study will be conducted from September 13, 2016 to December 31, 2016.