On behalf of the over 400 members of the National Stone, Sand & Gravel Association (NSSGA), I am writing to express our opposition to S. 1466, a bill that would adjust the boundary of the Santa Monica Mountains National Recreation Area to include the Rim of the Valley Corridor. 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 and was recognized by the California Department of Conservation as a “regionally significant construction aggregate resource.” In 2018, the Department identified the region as having less than 10 years of available aggregate reserves, currently only 17 million tons yet a 50-year demand of more than 385 million tons.