This document is a government generated Section 106 report consisting of a historic property inventory and an assessment of adverse effects associated with the A5 Powerline Replacement Project. The purpose of the document is to compile any prior or current studies performed in support of the A5 Powerline replacement project as a single Section 106 report. This report provides the information needed by the California State Historic Preservation Officer to concur on the project findings and determinations for individual resources as presented by the Vandenberg Air Force Base Cultural Resource Manager. The report specifically examines project impacts and/or avoidance strategies for twenty-seven archaeological sites; CA-SBA-592, -702, -775, -776, -1779, -2086, -2569H, -2570, -2571, -2883, -2884, -2885, -2886, -2887, -2888, -2889, -2894, -3213, -3215, -3232, -3348, -3376, -3527H, -3552H, -3560H, -3747, -3748.