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NC-2009 SSp1:Construction Activity Pollution Prevention

Perimeter protection

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Martin Meehan
Principal
Meehan Associates
LEEDuser Basic Member
14 thumbs up

We have a number of LEED projects in infill locations in Ireland. Since we don't really have a standard code for site Erosion and Sedimentation we have to stick to the U.S. EPA's CGP. Most of the requirements (inlet protection, dust prevention, etc.) are standard practice here, but I have never seen perimeter protection of any kind in this type of projects here. Is the perimeter erosion/sedimentation protection (i.e. silt fences) a must in projects at infill locations in the U.S.? Thanks very much.

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Michael DeVuono
Regional Stormwater Leader
Arcadis North America
LEEDuser Expert
144 thumbs up

Thu, 02/11/2016 - 15:09

I don't know that I would call it "perimeter protection" as silt fence and filter socks should really only be implemented on the downhill slopes, and parallel to the contours. There are rules of thumb to follow when implementing these practices (slope length, ft/ft) but some form of erosive protection is always required to prevent sediment transport from the site. We typically use the orange snow fence to mark the limits of disturbance or "perimeter" of a site, regardless of infill or not.
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Martin Meehan
Principal
Meehan Associates
LEEDuser Basic Member
14 thumbs up

Thu, 02/11/2016 - 15:59

Thanks Michael, that was very useful. So if I understand correctly, in a non-sloping site, vehicle entryway stabilization (i.e. gravel mat) and/or wheel washing will suffice for this purpose?
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Michael DeVuono
Regional Stormwater Leader
Arcadis North America
LEEDuser Expert
144 thumbs up

Thu, 02/11/2016 - 18:22

That's a minimum, yes. You really need to employ engineering judgment here. If it rains will soil run off the site? Even if it doesn't you may have areas subject to rilling that may need to be seeded if construction in these areas isn't expected immediately. You probably have a topsoil stockpile somewhere, that needs to be controlled from wind and rain erosion (tarps and silt fence). A flat site such as yours isn't hard, just employ a little common sense engineering and construction practice.

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