Many companies managing scrap metal bins and roll off boxes in Michigan request information
from the Department of Environmental Quality regarding controls that can help prevent storm
water pollution. Staff have observed companies successfully managing the oil and metal
wastes in various ways, including a combination of the following practices.
Structural Controls
Structural controls are physical features that control and prevent storm water pollution, which
range from preventive measures to treatment systems. While these controls are sectorspecific, the effectiveness of these controls is directly related to successful implementation of
nonstructural and preventative controls, some of which are identified in the next sections.
Covering is partial or total enclosure of the scrap metal dumpster or of the entire material
storage area to eliminate exposure to rain and/or runoff. This prevents the contamination of
storm water and stops the generation of additional wastewater from storm water combining with
the cutting oils in the dumpster.
Temporary covering methods include tarps and plastic sheeting. Considerations:
? Can become torn or ripped, or removed by wind
? Require frequent inspections; inspecting coverings must be part of an overall preventive
maintenance program. Maintenance involves frequent inspection of the covering for rips,
holes, general wear, and removal by wind.
? Evaluate durability and compatibility with material or activity being covered.
Permanent coverings can include an appropriate structure with a permanent roof.
Considerations include:
? A permanent structure may allow the facility to avoid the need for a National Pollutant
Discharge Elimination System permit for storm water discharges associated with industrial
activity (Industrial Storm Water Permit) if it covers all of the site's exposure.
? Health or safety problems may develop with enclosure built over certain materials or
activities.
? A structure with only a roof may not keep out all precipitation.
? Costs may prohibit the building of complex structures.
? Design considerations should minimally address ventilation and temperature needs,
vehicle and materials access, handling, and transfer.
? The structure may need internal drainage if it is not effective in keeping all water out.
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