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• SUMMARY SHEETS significant. .Results from Stage One would be evaluated before deciding to proceed with construction of the rest of the unit. Stage One development would involve the concrete lining and rehabilita- tion of structures along a 6.7-mile section of the Government Highline Canal between Big Salt Wash and Mack Wash in the western end of Grand Valley. Fourteen laterals that now serve the area under the canal sec- tion to be lined would be consolidated into 12-and placed in pipe sec- tions. About 6.5 miles of interceptor ditch and three small detention ponds would be constructed above the canal section to prevent runoff from entering the canal. Some existing cross-drainage features would be enlarged. Afield station would be constructed as part of the Stage One development for use as a construction headquarters anc~ permanent operat- ing facilities for the entire unit. To compensate for wildlife habitat losses, an area of suitable land would be acquired and initially de- veloped, and a watering pond would be constructed above the Government Highline Canal. A proportion of the cost of the Irrigation Management Services program for the overall unit would be assigned to the Stage One development, although the program would be implemented independent of the Stage One development. • EFFECTS ON THE COLORADO RIVER (average annual) Decrease in salt load (tons). 24,000 Reduction in depletion (acre-feet). 200 Reduction in salt concentration at Imperial Dam from decrease in salt load (mg/1) 2.5 PROJECT FEATURES Canal to be lined (miles) 6.7 Laterals to be improved (miles) Exi-sting 34.2 After construction 29.7 Interceptor ditch (miles) 6.5 • Detention ponds (number) 3 2