Oil Pit Considerations
Oil pits cannot be covered with a sealed material covering. After oil drilling has ceased at a location, the oil pit remains in place so the fluids can naturally evaporate. Each state has different regulations for allowing pits to remain stagnant, ranging from 30 to 365 days. After the allotted time has passed, the remaining oil debris within the pit must be collected and buried. However, the evaporation period can attract birds and insects, mistaking the area for a body of water. Organisms become trapped within the sticky pit, slowly dying from exhaustion and exposure to contaminants.
Wire Mesh
A common type of oil pit cover is a mesh structure made of wire. Oil drilling workers use the wire mesh as fencing along the oil pit's perimeter, as well as above the pit itself. However, wire mesh can deteriorate over extended periods of time, such as from rusting. Any breaks within the mesh allows access to the oil, possibly injuring wildlife.
Plastic Netting
Plastic netting, comprised of polypropylene, offers a durable material for extended periods in the weather elements. Unlike wire mesh, plastic netting does not rust. Wildlife can land on the plastic, but will not receive cuts or injuries from touching the material. Wildlife within a specific region can be identified, matching the netting's structural size to larger or smaller animals. The netting's openings can vary from 0.5 to 2 inches wide, depending on the wildlife the net is intended to protect.
Plastic Netting Considerations
Although strong, plastic netting can sag over time. Netting installed too close to the oil pit's surface can easily sag into the drilling muds, exposing wildlife to contaminants. Earthworks recommends installing the netting at least 4 to 5 feet above an oil pit in consideration of sagging factors.