Location: Esquimalt, BC

The project consisted of the design and installation of an engineered barrier wall, directly adjacent to the marine harbour, up to depths of 15M below grade to prevent the seepage of tidal water from entering the excavation. More than 2,200 square meters of face were installed on three sides of the excavation up to the high water mark. In constructing the wall, 2,500m3 of concrete was poured and 350m of steel piles or beams were used. Three drill rigs and six excavators were utilized in addition to an on site portable concrete mixing plant.

Prior to the start of work on the barrier wall, construction of three new lay down areas was undertaken and the relocation of steel racks, steel sheets, reels of cable, sea containers, a warehouse tent structure and a warehouse building to the three new areas. Over 30,000 man hours were used without any lost time incidents.

Upon completion of the barrier wall, the scope of work included the following:

• Excavation of over 100,000mt of soil to 15m below grade with limited stockpile area.
• Transport & disposal of roughly 67,000mt of impacted soils via truck, marine barge and rail transport. Of this total, roughly 2,800mt were impacted with hazardous waste level hydrocarbons or leachable metals and 52,000mt were impacted with waste levels of hydrocarbons and / or metals.
• Stabilization of roughly 1,800mt of leachable metals impacted soil.
• Approximately 28 Million Litres of water was pumped, handled, treated and discharged. Ground water, tidal water and rain water was collected from the excavation and run off was collected from stockpile areas to prevent impact to the base storm drains.
• 27,000mt of excavated soil was placed back into the clean excavation along with 35,000mt of clean import fill.
• On site screening of impacted soils was undertaken to reduce the disposal costs for the client. Clean screened rock was used as backfill on site. The site was located on a busy Canadian Military base with an active base road running between the site and the project stockpile area. Liaison between various military groups to minimize disruption to the base activities was required. 27 barges were loaded and transported to the Mainland and the US without incident.

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