My question is in regards to an assignment from the Introduction to Paralegalism book by William Statsky. The assignment given to us is from page 359 and it says,

"Identify the elements of the following rules:"

The one I'm struggling with says,

" 179(a)(7). If at any time it is determined that application of best available control technology by 1988 will not assure protection of public water supplies, agricultural and industrial uses, and the protection and propagation of fish, shellfish, and wildlife, and allow recreational activities in and on the water, additional effluent limitations must be established to assure attainment or maintenance of water quality. In setting such limitations, the Environmental Protection Agency must consider the relationship of the economic and social costs of their achievement, including any economic or social dislocation in the affected community or communities, the social and economic benefits to be obtained, and determine whether or not such effluent limitations can be implemented with available technology or other alternative control strategies. "

What are the elements of this rule? I'm not sure what is important information that should be listed as an element and what information should be left out.