Downtown Waterfront Redevelopment Plan - City of Alma

Downtown Waterfront Brownfield ProjectB. Soil and Groundwater ContaminationAfter environmental site assessments were performed, potential reuse plans were evaluated in context to contaminationissues identified. Soil and groundwater contamination on the site is critical for determining how land uses are arrangedand phased. Generalized areas of contamination are delineated in the figures that follow. A more detailed reporting ofthe soil and groundwater contamination is included in the Appendix.Evaluation conclusions indicate that the type of mixed use development proposed in the master plan could be accommodatedat the site with reasonable remediation. In addition, the following issues will be considered as the projectmoves into implementation:High Groundwater Level and Fill Issues:• Require performance of building-specific geotechnical assessments in all areas previously identifiedas containing fill.• Require performance of building-specific geotechnical borings in all areas where structures mayextend into or below water table.• Design frost protection for unheated slabs and paved areas (underdrains, etc).• Incorporate in construction documents measures for managing contaminated water during constructionbelow groundwater table.• Design footings/foundations to accommodate high water table (i.e. extending footings to clay,structurally tying foundations to slabs, etc).GroundwaterWade-TrimNTH Consultants36