Stockpiling materials on site
Protection of stockpiles is important to prevent offsite discharge of sediment. Stockpiles should be located close to the centre of site and away from any streams, drains or other locations where the material could migrate off site. Stockpiles must not be placed on asphalt or anywhere else where runoff goes directly to Porirua City’s stormwater network.
If material is being temporarily stockpiled to be taken off site, arranging the removal quickly and before rain prevents erosion from occurring and is preferable to long-term stockpiling.
If the material being stockpiled is not going to be used or removed immediately, silt fencing can be installed around the stockpile. Alternatively, the stockpile can be protected using geofabric or plastic (that is pinned down) or covered in hay.
A properly protected stockpile.
If a stockpile is going to be in place long term (three months or more), the most appropriate action may be to seed or hydroseed the stockpile and allow grass to stabilise the stockpile. This is especially relevant for topsoil stockpiles that are going to be reused as part of the final landscaping of the site.
