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I I I I I I I I I I 'I I I' I I I I I I' Ou234~ purpose has international involvement and potential environmental impacts in Mexico. Therefore, startup and ioperation of the YDP for water marketing will be negotiated with Mexico by IBWC, the :Federal agency responsible for ensuring that all treaties and agreements between the United States and Mexico are honored, including environmental agreements such as the North American Agreement on Environmental Cooperation. The 5-mile zone is a 36,OOO-acre area 10 miles south of Yuma, Arizona, containing Reclamation-acquired and other lands needed to construct, operate, and maintain a well field providing water to Mexico in partial fulfillment of the 1944 Treaty with Mexico and as required by Title I of the Salinity Control Act. Reclamation's discretionary activities in the zone are limited to maintaining the 21 wells in the well field, the associated delivery canal, and the YDP sludge disposal site. 9. Endangered Species Conservation Activities Reclamation has discretion to conduct activities benefitting threatened and endangered species under section 7(a)(1) of the ESA. Under the Act, Reclamation and other Federal agencies are permitted to: ' , "utilize their authorities in furtherance of the purposes of this Act by carrying out programs for the conservation of endangered species and threatened species listed pursuant to section 4 of this Act". In addition to aiding the recovery of listed species, Reclamation's endangered species program also has, as an objective, the conservation of non-listed species of concern to prevent their future lis~ng. C. Lower Colorado River Operation and Maintenance Procedures 1. Flood Control Flood control was specified as a primary project purpose by the Boulder Canyon Project Act, the act authorizing Hoqver Dam. The COE is responsible for developing the flood control operation 'plan for Hoover Dam and Lake Mead as indicated in 43 CFR 208.11. The plan is the result of a coordimited effort by the COE and Reclamation, but the COE is responsible for providing the flood control regulations and has authority for final approval. Any deviations from the flood control operating instructions must be authorized by the COE and the Secretary is responsible for operating Hoover Dam in accordance with these regulations. Flood control regulations for Lake Mead were established to deal with two distinct types of flooding: rain and sno~melt. Snowmelt constitutes about 70 percent of the annual runoff of the Colorado River intc;> Lake Mead. Lake Mead's uplrmost 1.5 maf of storage capacity, between elevations 1219.6 and 1229.0, is allocated exclt'~vely to control floods from rain events. Within this capacity allocation, I 35 .J