On behalf of the over 400 members of the National Stone, Sand & Gravel Association (NSSGA), I am writing to express our opposition to S. 1769, the “Rim of the Valley Corridor Preservation Act.” NSSGA represents aggregates producers and those who manufacture equipment and services that support the construction industry. As drafted, this legislation could severely impede future aggregate production in California, limiting critical building materials in Los Angeles County and the surrounding region. The Santa Clarita Valley is home to one of the state’s largest sand and gravel deposits and has been used for mining since the 1960s. In fact, it was recognized by the California Department of Conservation as a “regionally significant construction aggregate resource.” S. 1769 would also ignore prior actions of Congress and the U.S. National Park Service (NPS). P.L. 110-229 directed NPS to study the Rim of the Valley Corridor. In its final report, transmitted to this Committee on February 16, 2016, the NPS identified a preferred alternative and recommended a 170,000-acre expansion. The Rim of the Valley Corridor Preservation Act would go beyond this recommendation and further expand acreage for “trail connections” despite the fact these additional areas are not contiguous with the Corridor and were not studied by NPS. This further expansion of federally owned lands could negatively impact two existing BLM contracts to mine 56 million tons of sand and gravel by adding onerous NPS special use permitting requirements and could serve as a catalyst for future land acquisition on either the state or federal level.