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. , I . . I I I ! 4 Mexico pumped from its San Luis Mesa well field within five miles (eight kilometers) of the boundary near San Luis the following quantity in calendar years 1976 and 1977: Calendar Year 1976 1977 Acre-Feet 97,870 129,636 Cubic Meters 120,722,000 159,905,000 The United States pumped from domestic, municipal, and irrigation wells located within five miles (eight kilometers) of the boundary near San Luis the following quantity: Calendar Year Acre-Feet Cubic Meters 1976 22,7.18 28,047,000 1977 * * The Bureau of Reclamation has planned a U.S. well field of 22 wells for protective and regulatory pumping within five miles of the Arizona-Sonora Boundary near San Luis. Six wells have been constructed and another eight wells are under contract. The remaining wells are to be completed as needed to maintain flows across the southerly international boundary up to an annual rate of 140,000 acre feet per year. To provide a technical basis for consideration of groundwater basins in the border areas, contemplated in Minute No. 242, the Commission has initiated a program for exchange of groundwater data for the major groundwater basins lying partly in the United States and partly in Mexico including the Colorado River Delta area. The objective of the exchange is to make available hydro- logic, geologic, and water quality data in either country available to both countries for study to determine if there are present or potential problems, and to analyze such problems as exist. Preliminary findings relating to groundwater in the Colorado River Delta area were presented to Federal, State, and local authorities at a meeting in Phoenix, Arizona on October 7, 1977. New Developments. Point 6 of Minute No. 242 provides that: " . . . the United States and Mexico shall consult with each other prior to undertaking any new development of either the surface or the g"coundwate.r resources, 01- undertaking substantial modifications of present developments, in its own territory in the border area that might adversely affect the other country." 0Data to be supplied later)