5900 36TH AVE W SEPA 015 - 034 - SOUNDVIEW BUSINESS CAMPUS - VERITAS Land Use Decision Documents 2025-04-22

... the geographic area or areas within which an undertaking may directly or indirectly ' cause alterations in the character or use of historic properties, if any such properties exist. The area of potential effects is influenced by the scale and nature of an undertaking and may be different for different kinds of effects caused by the ' undertaking. If NRHP-eligible historic properties are identified within the APE, then potential adverse effects to the historic properties must be assessed and a resolution of adverse effects recommended. Under Section 106, the responsible Federal agency must, at minimum, consult with and seek comment from the State Historic Preservation Officer (SHPO) and/or the Tribal Historic Preservation Officer (THPO), as applicable, and consult with any affected or potentially affected Native ' American Tribe(s). For the purposes of this analysis, the degree to which the project adversely affects NRHP-eligible historic properties is the primary criterion for determining significant impacts. Secondary criteria include whether an alternative has the potential to affect districts, sites, buildings, structures, and objects listed in or eligible for listing in the Washington Heritage Register (WHR), the State of Washington's equivalent of the NRHP. ENVIRONMENTAL CONTEXT Literature review for this project included a review of environmental data on the project area illustrated in geologic and soils maps and of reports on recent geological and geomorphological investigations that described subsurface conditions and the post -depositional processes likely to ' affect any cultural deposits in the study area. Physiographic Province ' The APE is located within the western hemlock (Tsuga heterophylla) vegetation zone of the Puget - Willamette Lowland physiographic province (Franklin and Dyrness 1988). Vegetation would have included western red cedar (lhuja plicata), western hemlock, and Douglas fir (Pseudotsuga men�iesii) ' prior to clearing. The project area presently consists of tall grasses, thistle, and wetland deciduous trees. Geomorphology The project area is located on a glacially deposited terrace overlooking the Japanese Gulch drainage in the southeastern portion of the Puget Lowland. The Puget Lowland is a geological and physiographic province that was shaped by at least four periods of extensive glaciation during the Pleistocene (Easterbrook 2003; Lasmanis 1991). The bedrock was depressed and deeply scoured by glaciers, and sediments were deposited and often reworked as the glaciers advanced and retreated. A mantle of glacial drift and outwash deposits were left across much of the region at the end of the last of these glacial periods, the Fraser Glaciation (Easterbrook 2003). The Vashon Stade of the Fraser Glaciation began around 18,000 B.P. with an advance of the Cordilleran Ice Sheet into the lowlands (Porter and Swanson 1998). The Puget Lobe of the ice sheet flowed down into the Puget Lowland and reached its terminus just south of Olympia between ' 14,500-14,000 B.P. (Clague and James 2002; Easterbrook 2003; Waitt and Thorson 1983). The Puget Lobe was thicker towards the north and thinned towards its terminus in the south. The Puget Lobe began to retreat shortly after reaching its terminus, allowing marine waters to enter the lowlands. Tierra Archaeological Report No. 2014-077 7