SR 06:208 - Laserfiche WebLink

would mitigate flooding impacts due to stormwater runoff. Plan implementation would increase the watercourse carrying capacity in the Tri Valley and provide additional stormwater storage in the Chain of Lakes. See also Chain of Lakes discussion under Sand and Gravel, below. Sand and Gravel The General Plan Map designates about 1,600 acres of regionally significant sand and gravel deposits in the eastern Planning Area for Sand and Gravel Harvesting. TIlls land generally lies east of Martin Avenue, west of Isabel Avenue, and north of Vineyard Avenue. The Planning Area contains the largest single concentration of sand and gravel deposits in the entire Bay Area. Large sand and gravel harvesting companies own most of this land. Alameda County has granted Vulcan Materials Company and CEMEX permits entitling them to extract sand and gravel deposits. Over half of this land within the Planning Area has been or is in the process of being mined, with the remainder expected to last until about the year 2030.16 The California Division of Mines and Geology has designated the sand and gravel land in and adjacent to the PIeasanton Planning Area as an "Aggregate Resource Area of Regional Significance."" TIlls designation notifies the City and adjacent entities to identify these areas, assist in their management, and promote the conservation and development of this construction grade aggregate in their General Plans. Figure VII-3 shows the location of these lands, which are mostly owned by sand and gravel companies and designated for Sand and Gravel Harvesting use, on the General Plan Map. TIlls land is used for the managed production of natural resources. The Specific Plan for Livermore-Amador Valley Quarry Area Reclamation regulates and guides future sand and gravel harvesting and gravel quarry reclamation." The Specific Plan contains quarry operation phasing plans, a map showing usable land remaining after quarry pits reclamation, and a plan identifying future reclaimed land uses (i.e., a chain of lakes, a recreational trail, and areas potentially supporting future development). The Specific Plan for these lands, together with the State regional sigrtificance designation and the Pleasanton General Plan Sand and Gravel Harvesting designation, effectively protect this valuable resource until quarry operators deplete construction-grade aggregate deposits within the Pleasanton Planning Area. At the center of the County's reclamation efforts is the Chain of Lakes, a series of nine existing and future reclaimed gravel-mining pits. These lakes have the potential to provide storage for and recharge of potable water, and storage of stormwater and non-potable water. (See the Public Facilities Element for a Chain of Lakes water supply discussion under Water and for a flood control discussion under Stormwater Facilities, Flood Control.) These lakes can also provide recreational opporturtities to the 16 Zone 7 Water Agency, Stream Management Master Plan, March 2006. J7 Alameda County Board of Supervisors, Specific Plan for Livermore-Amador Vallfy Quarry Area Reclamation, adopted Nov. 5, 1981. 11\ Ibid. Con os Element, CC 082906, clean VII-14 City Council 8/29/2006