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Draft 14. Subregional Planning Element ^ Preserve the natural flow and recharge of water and support ecosystem processes • Protect and enhance significant open space and recreation areas and networks ^ Protect scenic historic and cultural resources that contribute to the region's identity TRI-VALLEY SUBREGION Subregion Description The Tri-Valley subregion (Figure ~1-I14-2) encompasses 363 square miles of land generally located in the San Ramon, Livermore, and Amador valleys. It includes Danville, Dublin, Livermore, Pleasanton, San Ramon, and the adjacent unincorporated areas of Alameda and Contra Costa Counties. Major service providers to the area include the East Bay Municipal Utility District, Zone 7 of the Alameda County Flood Control and Water Conservation District, Dublin_San Ramon Services District, Central Contra Costa Sanitary District, xt~the East Bay Regional Park District,_and the Livermore Area Recreation and Park District. The Tri-Valley planning area is bounded generally by the East Bay hills to the west, an east-west line extending through Mount Diablo State Park to the north, Altamont Pass and other features of the Diablo Range to the east, and the watershed lands of the San Francisco Water District and the southern extent of the Livermore Valley to the south. The area consists of expansive grass-covered grazing lands, steep and rolling hills, prominent ridges, oak woodlands, broad valleys, farmlands, and urban communities. Primary natural resources include sand=and=gravel deposits and wind energy generation. Until the 1950s, ~ericultural and related businesses comprised the primary land uses in the Tri-Valley area .The cities of Pleasanton and Livermore incorporated in the late 19th century and provided services for the local agricultural economy. The establishment of the Lawrence Livermore Laboratory and other major research facilities in the 1950s began to change the character of the area. The completion of the freeway system in the 1960s and early 1970s opened the Tri Valley to extensive single-family residential development in both the incorporated and unincorporated areas. The Town of Danville and the City of San Ramon in Contra Costa County, and the City of Dublin in Alameda County, incorporated in the early 1980s and included land within their borders which had previously developed under County jurisdiction. During the 1980s, the Tri-Valley area became a major employment center for the region, with the development of the Bishop Ranch Business Park in San Ramon and the Hacienda Business Park in Pleasanton. Growth in the Tri Valley is projected to be substantial in the coming years. Between ~99~-2005 and 2992025, the number of householdsiHg-wits is expected to increase by 38~ percent, from about Subregional %anning 060507, redline 1FI114-5 City Council 6/5/2007