Erosion and Sediment Control Requirements

Why Erosion and Sediment Control?

During construction, soils are often exposed due to vegetation removal, excavation, and vehicle access roads. Exposed soils can lead to erosion, with sediments washed onto roads and into catch basins, storm sewers and streams. Sediment laden water is detrimental to fish health and can clog or damage the drainage system. To help maintain healthy watercourse ecosystems, the city implemented Stream and Drainage System Protection Bylaw, 2003, No. 7541, which includes Erosion and Sediment Control requirements for development to prevent the discharge of a prohibited substance into the stream and drainage system. 

What Are The Key Requirements of the Bylaw?

Water discharged from a site must not contain any sediment, rock, gravel, sand, clay, silt, sediment, earth, construction or excavation wastes, cement, concrete, exposed aggregate wash water or other substances which, when introduced into a drainage system, will at the point of deposition, result in:

  1. A turbidity of more than 100 Nephelometric Turbidity Units (NTU) during and for 24 hours following a Significant Rainfall Event (>25mm in 24 hours), or more than 25 NTU  during any other time
  2. A pH value outside of the range 6.5 - 8.0; or
  3. A temperature increase of 2 degrees Celsius or more.

Complex Developments (three units & larger, streamside developments, and projects on steep slopes or with slope instability as identified by a geotechnical study) are required to submit an Erosion and Sediment Control Plan prepared by a Professional Engineer or Certified Professional in Erosion and Sediment Control (CPESC).

A monitoring program to measure the suspended solids in the run-off water discharged from the construction work is required for all complex developments. Monitoring must occur at minimum twice a month during dry months (May-September), weekly during wet months (October - April), after a Significant Rainfall Event, and until at least 90% of construction is complete. The results of the monitoring program must be submitted the City’s Engineering Department esc@cnv.org within one week of each site inspection.
Penalties for discharge of a prohibited substance include fines of up to $10,000 per offence. As the City drainage system is connected to fish-bearing streams and Burrard Inlet, any discharges to the storm drains are also prohibited under the Federal Fisheries Act, with fines of up to $300,000 for first time offences.

Water Discharge Criteria

Water discharged from a site must not contain any sediment, rock, gravel, sand, clay, silt, sediment, earth, construction or excavation wastes, cement, concrete, exposed aggregate wash water or other substances which, when introduced into a drainage system, will at the point of deposition, result in:

  1. A turbidity of more than 100 Nephelometric Turbidity Units (NTU) during and for 24 hours following a Significant Rainfall Event (>25mm in 24 hours), or more than 25 NTU  during any other time
  2. A pH value outside of the range 6.5 - 8.0; or
  3. A temperature increase of 2 degrees Celsius or more.

Erosion and Sediment Control Plan

Complex Developments (three units & larger, streamside developments, and projects on steep slopes or with slope instability as identified by a geotechnical study) are required to submit an Erosion and Sediment Control Plan prepared by a Professional Engineer or Certified Professional in Erosion and Sediment Control (CPESC).

Monitoring / Reporting Requirements

A monitoring program to measure the suspended solids in the run-off water discharged from the construction work is required for all complex developments. Monitoring must occur at minimum twice a month during dry months (May-September), weekly during wet months (October - April), after a Significant Rainfall Event, and until at least 90% of construction is complete. The results of the monitoring program must be submitted the City’s Engineering Department esc@cnv.org within one week of each site inspection.

Penalties and Enforcement

Penalties for discharge of a prohibited substance include fines of up to $10,000 per offence. As the City drainage system is connected to fish-bearing streams and Burrard Inlet, any discharges to the storm drains are also prohibited under the Federal Fisheries Act, with fines of up to $300,000 for first time offences.

Coach House, single family or two-family (duplex) developments applying to the City of North Vancouver for a Building Permit must submit an Erosion and Sediment Control Plan.

Developments of three units & larger, streamside developments, and projects on steep slopes or with slope instability as identified by a geotechnical study are required to submit an Erosion and Sediment Control Plan.

Share |