An amendment to require the EPA with projects that have a variety of designs to conduct the design and efforts in a manner that leads to sound design decisions at reasonable costs. To effect this the agency is 1) discourage duplicative studies and reviews, 2) encourage use of engineering and economic data and conclusions in existence from other projects, 3) encourage procedures that allow early elimination of unattractive designs, and 4) see that study and design costs are reasonable and in line with engineering and work industry standards for comparable work.