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oc Collect and remove debris from paved areas before snowfall to avoid collecting debris when plowing. co Store materials away from areas where it could get mixed with snow and moved around when the area is plowed. Keep materials out of accumulated or dumped snow. oo Inspect containers and drums throughout the winter to be sure they withstand the cold. co Sweep sand, salt, and spilled materials from paved surfaces throughout the winter and before snow melts. oc Cover salt storage areas to help minimize contact with stormwater. oo Use judicious amounts of de-icing and anti-skid chemicals and road salt. co Keep plowed snow out of retention ponds. This ensures the treatment capacity of the pond is available during snowmelt or rain on frozen ground. Stormwater treatment best management practices Stormwater treatment Best Management Practice(s) (BMPs) are engineered structures that treat stormwater runoff or reduce the stormwater runoff rate, volume and velocity. In combination with P2 practices, stormwater treatment BMPs such as retention ponds act as a second line of defense against polluting downstream waterbodies. Treatment BMPs should be used down -gradient of areas where P2 activities have been fully implemented. Specific guidance on stormwater treatment BMPs is in the Minnesota Stormwater Manual and the BMP Guidebook, which are linked in the Resources section at the end of this fact sheet. Automotive salvage yards are prohibited from expanding or building new stormwater infiltration systems such as infiltration trenches, filter strips or rain gardens. However, they may continue to use infiltration systems that existed before April 2010. Retention ponds must be built with a liner that meets the requirements listed in the permit. See Part VII of the permit for details. Groundwater pollution potential Auto salvage yards and similar facilities have the potential to contaminate groundwater with pollutants such as solvents, heavy metals, fuels, oils, grease and mercury in their stormwater runoff. Groundwater contamination is of greatest concern where there is a high water table and in karst regions. A water table that is close to the surface can allow pollutants to enter the groundwater system quickly. Karst is common in southeastern Minnesota and is largely shaped by the dissolving action of water on limestone. Over time, this creates features such as sinkholes, disappearing streams, complex underground drainage systems and caves. Water and pollutants can flow rapidly through these features to wells and streams. In these areas it is critical to prevent infiltration of any contaminants by providing physical barriers around vehicle and parts storage areas. Examples of physical barriers include impervious surfaces with cover or perimeter berming and a wastewater collection system. Unpaved storage yards and processing areas are unacceptable in areas of high groundwater pollution potential. Stormwater treatment BMPs should be designed with sensitivity to local conditions. Resources BMP Guidebook (fact sheet #wq-strm3-26) is available on the MPCA website at http://www.pca.state.mn.us/index.php/view-document.html?gid=10557. EPA industrial stormwater fact sheet, Sector M: Automobile Salvage Yards, is available on the EPA website at http://www.epa.gov/npdes/pubs/sector m autosalvage.pdf. EPA refrigerant webpage, Just the Facts for MVACs: EPA Regulatory Requirements for Servicing of Motor Vehicle Air Conditioners, available on the EPA website at http://www.epa.gov/ozone/title6/609/iustfax.html. Industrial stormwater webpages on the MPCA website at http://www.pca.state.mn.us/industrialstormwater. Industrial stormwater permit (document #wq-strm3-67a) is available on the MPCA website at http://www.pca.state.mn.us/index.php/view-document.htmi?gid=20797. Low Impact Development for Businesses webpage on the MPCA website at http://www.pca.state.mn.us/veiz7d0. Page 4 of 5 April 2015 1 p-p2s8-03