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SUMMARY Water quality program (pages C-29 through C-39 of FES) In the FES, two main water quality concerns were noted. The first stemmed from the high nutrient (phosphorous) loading and eutrophication of existing Deer Creek Reservoir that also would likely occur in Jordan- elle Reservoir. The second was related to abandoned mine wastes (tail- ings ponds) located in and near the north arm of the proposed Jordanelle Reservoir. Phosphorous Loading Jordanelle Reservoir is expected to retain some of the nutrient load that currently impacts Deer Creek Reservoir, and control of phosphorous inflows is crucial to maintaining the water quality of both reservoirs. Accordingly, Reclamation is committed to an areawide joint Federal/ State/local government Water Quality Management Plan (WQMP) which has been approved by the Environmental Protection Agency (EPA). Since Jor- danelle Reservoir would reduce phosphorous loading in Deer Creek Reser- voir by about 4,800 kilograms per year (kg/yr), construction of Jordan- elle Reservoir is a part of the overall Water Quality Management Plan. A number of other provisions are in the plan, including those concerning construction-related permits, the Jordanelle Reservoir management bound- ary, the approval/coordination/monitoring/maintenance process, installa- tion of a multilevel outlet, and mine tailings stabilization, as noted below. Mine Tailings Stabilization The 1979 FES addressed two separate mine tailings sites which had the potential for harmful impact to Jordanelle Reservoir water quality. The Olson/Neihart site is the major concern, as it will be inundated by the proposed Jordanelle Reservoir. The Mayflower tailings are adjacent to the proposed new management boundary. The Olson/Neihart site will be stabilized, probably by removal from the reservoir basin, by either EPA through the National Priority List Superfund program, or by the Bureau of Reclamation. The Mayflower site will be stabilized by the landowner. Reclamation has developed an agreement with the landowner to study the potential for consolidating and stabilizing both Olson/Neihart and Mayflower tailings at the Mayflower site without damaging the development capability of the Mayflower property. Should the Mayflower property owner fail to stabil- ize the tailings by initial reservoir filling, then Reclamation will stabilize the tailings through easement or purchase, as discussed in this supplement. Construction activity and schedule By early 1987, the Jordan and Alpine Aqueducts were about 97 per- cent complete. Reach 1, Reach 2, and Reach 3 of the Jordan Aqueduct and Reach 1 of the Alpine Aqueduct (see Frontispiece Map) are complete. s-s