Reclaimed coal mine rock pile (Okane Archive)

State-of-the-Art Field Performance Monitoring System

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Background

Enterprise Cape Breton Corporation (ECBC) implemented a remediation program for the closure of historic coal mines located near Sydney, Nova Scotia. Multiple mine rock stockpiles (MRSs) were reclaimed with cover systems, and three of them incorporated a geosynthetic layer. Okane was engaged to design and install an advanced field performance monitoring system across several of the MRSs to assess the effectiveness of different remediation cover systems.

Approach

Analyzing the in-service performance of cover systems that use geosynthetics and natural materials revealed unique water balances variations resulting from subtle differences in cover system design at various sites. Data showed that successful performance (in terms of managing net percolation) relied on robust lateral drainage, reduced seepage-induced erosion, landform stability and plant-available water, rather than managing hole development during construction.

Client Benefit

Okane’s detailed performance monitoring achieved high data capture rates which allowed for informed and effective communication of performance to stakeholders. Integration with cover system construction crews allowed for the schedule to be maintained.

Reclaimed coal mine rock pile [Digital Image]. Okane Archives.

Performance monitoring showed that the sites had unique water balances and water dynamics stemming from subtle design differences; all of which have significant impact on performance in terms of closure.