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The Bureau intends to use this supplement to the FES to satisfy the exemption for a Section 404 permit to discharge dredged and fill material into navigable waters. The Bureau has determined that if the recommended fish and wildlife mitigation plan is implemented in a timely manner, there will be no significant adverse impacts to wetlands, benthos, nekton, and plankton. The draft and final supplements address the project effects on wetlands and flood plains (Executive Orders 11988 and 11990). Public awareness of project effects is provided, in part, through the review and comment process for the draft supplement and through public hearings held by the Bureau. II. PROPOSED ACTION A. General. The project will consist of a system of well fields to be developed in four stages (Stage 1-2 is a combined stage) over an 8-year period. The well field laterals will collect and deliver the pumped ground water to an open conveyance channel about 42 miles long. About 100 miles of laterals, 140 miles of electric transmission lines, and 13 million kilowatt-hours annually of electricity will be required. B. Changes in the project plan. The proposed action is the same as that presented in the 1979 FES except as described below and on the table at the end of this summary. In the 1979 FES, lands within project boundaries including the 13,800-acre Mishak NWR totaled 138,500 acres. About 8,500 acres of the Mishak NWR lands were outside Stages 1-5. With the revised mitigation plan, these 8,500 acres will not be requireu; thus, the total lands within the project boundaries are reduced to 130,000 acres. The remaining 5,300 acres of the Mishak NWR were included in Stage 5 and were to be acquired in fee title. Under the revised mitigation plan, these lands will not be acquired but will remain within Stage 5 and the total project boundary. The FES (1979) stated that 95 to 165 wells would be required. From 30 to 55 wells will be required in Stage 1-2; 25 to 40 in. Stage 3; 25 to 40 in Stage 4; and 15 to 30 in Stage 5. The total estimated for all stages is now 175 wells. The number of wells estimated for Stages 3, 4, and 5 have not changed. However, if the number of wells should change in these stages, there would be no additional environmental impact. It has been determined that use of pipe stands and surge tanks is the most dependable and economical method for controlling surge in the pipelines. In Stage 1-2, 52 pipe stands and surge tanks will be required. Pipe stands will range in height from about 10 to 25 feet above ground and have diameters ranging up to 72 inches. Surge tanks will range in height from about 15 to 25 feet above ground with diameters ranging up to 78 inches. These structures will not be obvious from existing major highways in the area. The 1979 FES did not consider the use of surge tanks and pipe stands. c \.... .. ~'u ....",.' 1! Cl, ',[ t ... #J