Question

u.s. army corps of engineers, new england district
heavy equipment in wetlands
operating heavy equipment other than fixed units (drill rigs, fixed cranes, etc.) within wetlands shall be
minimized, and movable equipment shall not be stored, maintained, or repaired in wetlands to the
maximum extent practicable. due to its nature, fixed equipment shall not be moved for such purposes.
where construction requires heavy equipment operation in wetlands, the equipment shall a) have low
ground pressure (typically <4 psi), b) be placed on timber mats that are adequate to support the equipment
in such a way as to minimize disturbance of wetland soil and vegetation, or c) be operated on frozen
wetlands. timber mats are to be placed in the wetland from the upland or from equipment positioned on
other types of swamp mats if working within a wetland. other support structures that are capable of safely
supporting equipment may be used with written corps authorization. an adequate supply of spill
containment equipment shall be maintained on-site. at a minimum, timber mats should be managed in
accordance with the following construction mat best management practices:

• mats should be in good condition to ensure proper installation, use, and removal.
• where feasible, mats should be carried and not dragged unless they are being used as a grading

implement.

• where feasible, place mats in a location that would minimize the amount needed for the wetland

crossing.

• to prevent the spread of invasive plant species, swamp or timber mats are to be thoroughly

cleaned before reuse.

• install adequate erosion and sediment controls at approaches to mats to promote a smooth

transition to, and minimize sediment tracking onto, swamp mats.

• in most cases, timber mats should be placed along the travel area so that the individual boards

are resting perpendicular to the direction of traffic. no gaps should exist between mats. place
mats far enough on either side of the resource area to rest on firm ground.

• provide standard construction mat best management practices to work crews.
• minimize impacts to wetland areas during installation, use, and removal.

construction equipment such as barges in tidal waters shall provide clearance above the substrate to
you are in charge of a construction crew that is
currently working in a wetland area. based on the
document shown, the most important characteristic
of timber mats in relation to operating heavy
equipment in wetlands is their.
a stability.
b spill containment.
c grading.
d erosion controls.
e sediment tracking.

Explanation:

The text discusses the use of timber mats in wetland construction. The key is to determine the most important characteristic of timber mats for operating heavy equipment. The text mentions that mats should support equipment, be placed to minimize disturbance, and support the equipment. Stability is crucial as it ensures the mats can bear the weight of heavy equipment without sinking or shifting, which is essential for safe and effective operation in wetland environments. Other options like sediment tracking (related to minimizing sediment spread but not the core for equipment operation), erosion controls (more about sediment and soil protection rather than equipment support), grading (a construction task, not a mat characteristic for equipment), and spill containment (about preventing spills, not equipment operation support) are less relevant compared to stability.

Answer:

A. stability