The National Pollutant Discharge Elimination System (NPDES) is an EPA initiative to clean waters, by keeping control of contaminants at their very source. To keep pollution and debris from penetrating rivers, lakes and oceans, NPDES rules require that municipalities, factories and construction sites to keep stormwater runoff from washing hurtful pollutants into regional surface waters.
Following this regulation is tough on construction sites, which can be beset by mud. If trucks depart the job site with their tires coated in mud–which may keep chemicals and other pollutants from building processes–and track the mud over bordering streets, they have broken the rules, and can see their NPDES permit revoked.
This is the reason that construction site entries are paved with gravel or sheets of plywood; they double as “doormats” for the muddied truck tires, cleansing them before they hit the roads. Yet the gravel and plywood are single-use, single-site solutions that can’t be quickly cleaned and transported to the next jobsite. Their use, therefore, is wasteful.
To resolve this issue, a Colorado company known as FODS (Foreign Object Debris System) has designed Trackout Control Mats, a durable, cost-saving, and ecofriendly reusable construction entrance mat. This proprietary mat design cleanses mud and sediment from vehicle tires without harming the tire or the ground surface.
The mats take the form of 7’ x 12’ sheets of HDPE with pyramids molded across the top.
The product’s alternating lines of pyramids are engineered to open a tire’s lugs as vehicles drive over it, prompting the loosening of the mud to loosen and descend into the base of every mat. The mud gathers at the mat’s base, stopping it from reaching the street. It will not access the tires of vehicles that follow, keeping mud, debris, and other pollutants from departing a jobsite and penetrating roadways or stormwater systems.
Once taken to the jobsite, the mats are placed into a roadway and bolted with steel hardware.
Once the work is complete, the mats can be cleaned with a streetsweeper, a broom attachment on a skid steer or a pressure washer.
The durable, reusable mats weigh 430 pounds and can support 250,000 pounds per individual single sheet.
In addition, HDPE mats are recyclable—thus adding to their sustainability.
Source: Core 77