Featured Project

Multi-Phase Project on the West Coast of BC

West Vancouver, BC
Key Services
  • In-situ Technology
  • Soil Excavation and Disposal
  • Soil Management

This comprehensive project highlights the advantages of engaging an Environmental Contractor equipped with the expertise in regulatory and compliance requirements to address diverse environmental issues at a site. The success of this project was driven by a strong emphasis on partnerships and collaboration. 

The installation of the PRB at this particular site stands out as a remarkable achievement, being the longest, widest, and deepest PRB ever installed, especially noteworthy considering the challenging tidal environment. The project unfolded in multiple phases, with the initial stage focusing on the rejuvenation and extension of the PRB through caisson drilling. 

Subsequent phases of the project encompassed managing and stabilizing contaminated soil. Milestone executed soil excavation, transporting the contaminated soil to on-site storage cells, and ensuring proper disposal at a licensed off-site facility. Additionally, the team constructed new soil holding cells, managed the disposal of various waste streams such as wood poles and concrete, backfilled excavations, and undertook the rehabilitation of site roadways.

Key Challenges
  • Remove spent existing PRB wall media, and replace new PRB wall media, through caisson drilling. 
Key Solutions
  • 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). 

Indigenous Engagement:


Fostering engagement, partnership, and sustained collaboration across multiple project phases to achieve a successful outcome. 


Execution of several project phases involved close collaboration with our joint venture partners, KFN Enterprises, and the Kwikwetlem Nation. 


In partnership with the Kwikwetlem Nation, Milestone successfully excavated 40,000 m3 of contaminated soil. On-site cells were constructed for the storage of excavated material. The process included confirmatory sampling, with the contaminated soils being disposed of at a licensed off-site facility. Hazardous waste materials underwent segregation and stabilization before shipment. To facilitate bulk cement storage, a cement silo was mobilized to the site. 

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