This local plan for Contra Costa County limits urban development in the county to no more than thirty-five percent of the land in the county. At least sixty-five percent of all land in the county shall be preserved for agriculture, open space, wetlands, parks and other nonurban uses. To ensure the enforcement of the 65/35 standard, this ordinance establishes an urban limit line to be recorded on the “Contra Costa County Urban Limit Line Map.”