Case Studies

Dufferin Aggregates Mosport Pit

Dufferin Mosport Ontario Aggregates Pit Environmental Noise Compliance Approval (ECA) 3

Location: Town of Clarington, Ontario, Canada
Owner/Operator: Dufferin Aggregates 

Dufferin Aggregates, a division of Holcim (Canada) Inc., is a leading supplier of aggregates for the construction industry in the Greater Toronto Area (GTA) and adjacent municipalities. Operating five limestone quarries and five sand & gravel pits across Ontario, Dufferin Aggregates is a key player in the communities where it operates.

HGC Engineering completed a site-wide Acoustic Assessment of the Mosport Pit in support of an application to the Ontario Ministry of the Environment (“MOE”) for an Environmental Compliance Approval. In addition to point-of-reception measurements of overall facility sound levels, we conducted comprehensive onsite measurements of noise producing equipment using superior sound intensity instrumentation and measurement techniques.

A 3D acoustical model of the site and surrounding area was developed, to which the source measurement data was input in order to predict the individual contribution of each noise source to the overall sound levels of the site in the surrounding community. These overall sound levels were then evaluated with respect to the applicable limits, established in accordance with MOE guidelines.

Primary Sound Sources Include:

  • Excavators
  • 50 tonne haul trucks
  • Primary and cone crushers
  • Primary, secondary and tertiary screens
  • Wash plant
  • Conveyors and front end loader
  • Portable screener

Acoustical Engineering Services Included:

  • Comprehensive onsite and offsite acoustical measurements
  • Predictive acoustical modeling
  • Acoustic Assessment Report


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