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Las Vegas Wash Uni t A contract waS awarded to construct the 3.5 mile Pittman bypass pipeline with the completion date set for November 28, 1984. The curtailment of seepage from the unlined ditches is expected to cause a rapid drop in ground-water levels in the !Pittman area, resulting in reduced loading 01'8,000 tons per year to Las Vegas Wash. Monitoring of the resulting ground-water changes is expected to cont i nue through FY 1987 when an asses sment will be made of the results of the Pittman Verification Program. w 00 -..J A draft supplement to the March 1980 Definite Plan Report was prepared in ~Jl June 1983. Completion of the draft environmental statement is scheduled for mid-1985. Another strategy which may be cost-effective to further reduce salinity loading is usir'lg ground-water barriers in other areas of the Wash. Continued close coordination with local interests will be necessary to gain support on further plans for salinity control, wastewater treatment,'wetlahds park, and recreation land use. A verification effort has been proposed to test the effectiveness Of the ground-water barrier concept with a monitoring program because the effectiveness of the barrier concept has not been proven. Paradox Valley Unit Deep well injection still appears the most cost-effective solution for disposal of collected brines. Contract work is underway to identify a new injection well site in a shallower receiving formation with the objective of drilling and testing a well. Two independent contracts were selected for geophysical data interpretation. Their task is to identify the best location for a test well .from the geophysical data that Reclamation has obtained; The current deep' well site selection process has delayed the well drilling contract award until at least March 1985; A proposed boundary of a wilder- ness study area may interfere with access to a potential injection well site location. Proposed for Construction (5.752) (H.R. 2790) Lower Gunnison Basin Unit The Planning Report and Final Environmental Statement were filed with EPA on January 12, 1984. Reclamation has recommended to the Secretary of the Interior that the Planning Report and Final Environmental Statement be adopted and trans~itted to OMB (Office of Mnagement and Budget) and to the President for advlce on forwarding the report to Congress for consideration for authorization. Advance planning studies were initiated on the winter water portion in FY 1984. The winter water replacement plan alone would reduce salinity at Imperial Dam by about 8 mg/L with the total plan reducing 12 <J';'; ~1