EarthView Environmental, Inc. (EVE) conducted a geoarchaeological assessment of the proposed Unit 4 Expansion of the Sutherland Generating Station in Marshall County, Iowa. EVE worked under contract with the Louis Berger Group, Inc., Marion, Iowa (LBG), to meet the requirements of a research plan prepared by LBG and the University of Iowa Office of the State Archaeologist (OSA) and approved by the Iowa State Historic Preservation Office (SHPO).
The purpose of the investigation was to determine the potential for buried archaeological sites to occur within the proposed project’s Area of Potential Effect, and to provide LBG archaeologists with recommendations for the depth of subsurface testing. An evaluation of aerial photos and soil maps identified additional areas with subsurface potential where little or no subsurface testing for buried sites had been done. These areas were the focus of the investigations conducted by EVE.
Fieldwork consisted of extracting solid, continuous cores, using a
Giddings hydraulic drill rig mounted on a John Deere Gator. Holocene-age surfaces along the proposed gas pipeline extending north from the primary project area were not accessible to the drill rig, and were investigated by hand coring with a manual bucket auger. Cores were described using standard NRCS terminology, identifying soil horizonation and sedimentary depositional environments.