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The Arroyo Seco Improvement Program (ASIP) is intended to provide active channel improvements and stream zone management activities that will reduce current flood and erosion risk while providing additional and improved habitat for critical species that may use the Arroyo Seco at the Sandia National Laboratories, California (SNL/CA). SNL/CA facility is operated by the National Technology and Engineering Solutions of Sandia, LLC (NTESS) under a contract with the U.S. Department of Energy/National Nuclear Security Administration (DOE/NNSA). The DOE/ NNSA’s Sandia Field Office (SFO) oversees the operations of the site.

This document transmits the U.S. Fish and Wildlife Service's (Service) biological and conference opinions based on our review of National Nuclear Security Administration's (NNSA) proposed Maximum Operations Alternative at Sandia National Laboratories (SNL/CA), Alameda County, California.

The purpose of this biological assessment is to review the proposed continued operation of Sandia National Laboratories, California (SNL/CA) in sufficient detail to determine to what extent the proposed action may affect the species listed below. This assessment is prepared in accordance with Section 7 of the Endangered Species Act [16 U.S.C. 1536 (c)].