Featured Project

Multi-Phase Project on the West Coast of BC

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Location
West Vancouver, BC
Year
2017, 2018, 2020

Engagement, partnership and continuity through multiple phases of work produces successful outcomes

This multi-phase project is a testament to the benefits of using an Environmental Contractor who has the regulatory and compliance requirement knowledge to tackle a site that requires a multitude of services to address environmental concerns.

Partnerships and collaboration have been a key focus in creating successful outcomes. Many of the Milestone team members have been involved in remediation activities over the years and with the PRB (passive reactive barrier) technology on other sites. When the PRB was installed at the site, it was the longest, widest, deepest PRB installed; an especially impressive feat given the tidal environment.

The initial phase was to rejuvenate, and extend, a PRB all using caisson drilling. Subsequent phases involved contaminated soil management and stabilization services, Milestone conducted soil excavation of contaminated soil, hauling to onsite storage cells, and disposal at a licensed, off-site facility. Additionally, Milestone constructed new soil holding cells, disposed of various waste streams (e.g., wood poles, concrete), backfilled excavations and rehabilitated site roadways.

Several phases of work were completed working with our joint venture partners, KFN Enterprises and the Kwikwetlem Nation. Together with the Kwikwetlem Nation Milestone excavated 40,000 m3 of contaminated soil. Cells were constructed on site for storage. Confirmatory sampling was completed, and soils were disposed of at a licensed, off-site facility. Hazardous waste materials were segregated and stabilized, prior to shipment. A cement silo was mobilized to site to allow for storage of bulk cement.

Type of Work
  • Soil and Groundwater Remediation
Key Services
  • In-situ Technology
  • Soil Excavation and Disposal
  • Soil Management
Key Highlights
  • Two types of wall media were produced: M1 and M2. The production of wall media, through blending of the wall media elements (pea gravel, compost, sand, ZVI, limestone) was strictly controlled, from a QA/QC point of view, requiring care / attention of all involved. Blending was undertaken using excavators enabling efficient blending but requiring great care.
  • The lower portion of the PRB wall is made up of M1 with the upper portion M2. The media was placed within the caisson, once the spent wall media / native material was removed, and great care was taken the ensure media was placed in such a fashion to minimize media element separation and ensure that media was placed at design depths.
Project Scope
  • Produce Permeable Reactive Barrier (PRB) media through blending predetermined quantities of pea gravel, limestone, sand, compost and zero valent iron (ZVI).
  • Remove spent existing PRB wall media, and replace new PRB wall media, through caisson drilling.

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