#SM0018-02 Stockpile Management

Stockpile management procedures and practices are designed to reduce or eliminate air and storm water pollution from stockpiles of soil, paving materials, cement-based products, chemicals, ferrous metals, pressure treated wood, and any other materials stored onsite.

Stormwater runoff can become contaminated when it comes into contact with unprotected stockpiled materials. Contact with cement-based products, such as stucco mix, will cause stormwater’s pH to rise, and contact with spoils or other stockpiled landscape materials, such as mulch, will impact water’s turbidity.  Protection of stockpiles is a year-round requirement to protect stormwater quality during the rainy season and prevent fugitive dust in the dry season.

The following are procedures to properly manage stockpiles, according to the CASQA BMP Handbook:
• Locate stockpiles at least 50 feet away from concentrated flows of storm water, drainage channels, and storm drain inlets.
• Protect all stockpiles from stormwater run-on using temporary perimeter sediment barriers such as berms, fiber rolls, and/or gravel bags. All stockpiles should be protected prior to and during rain events.
• Implement wind erosion control practices as appropriate on all stockpiled materials. For specific information, see WE-1, Wind Erosion Control.
• Manage contaminated soil stockpiles in accordance with WM-7, Contaminated Soil Management.
• Place bagged materials on pallets and cover with plastic.
• If inactive for more than 14 days or if rain is predicted to occur, stockpiles must be covered and bermed.