Reclamation of Clark Creek Pit

Client: 
Metro Vancouver

Clark Creek Pit was used as a source of aggregate for the construction of Highway 5 in the early 1990’s.  This decommissioned pit encompasses approximately 8.5 hectares of land that required reclamation.

On behalf of the Ministry of Transportation and Infrastructure (MoTI), SYLVIS undertook biosolids applications at Clark Creek Pit.  Clark Creek Pit is the third in a series of pits within the Southern Interior of British Columbia to be reclaimed by SYLVIS on behalf of the MoTI.

Over 2,500 bulk tonnes of Class A and Class B biosolids from three Metro Vancouver Waste Water Treatment Plants were beneficially used by SYLVIS in reclamation of the Clark Creek Pit.  Biosolids were applied and incorporated throughout the disturbed areas, at two different application rates – a bare-ground reclamation rate and a tree fertilization rate in areas where juvenile Lodgepole pine recruits were established. Following application, biosolids were incorporated into the soil surface and the area was seeded with native grasses.  Cattle seasonally graze in the region and the vegetation cover will provide high quality forage. Biosolids applications were completed by SYLVIS staff using SYLVIS’s application and incorporation equipment.

Biosolids applications provide nutrients and organic matter which improves the soil and provides a stable growing medium for grasses in the short term.  In the long-term, the slow-release properties of biosolids-based nutrients enhance the natural succession of trees.  Biosolids applications are vital to a successful reclamation program.  The application of biosolids provided an additional 3% soil organic matter resulting in a tenfold increase from pre-application soil concentrations.

SYLVIS managed all aspects of the project including site and road preparation, stakeholder and First Nations consultation, operational logistics and qualified professional oversight.  Efficient operations from the initial access road improvement until final seeding resulted in the successful completion of operational work within a brief six month period.