Geotech Report - Canaan Valley Valley Trail Improvements.pdf

This geotechnical report was prepared by American Geotech, Inc. for Chapman Technical Group regarding a proposed ADA observation deck and ramp project at Canaan Valley State Park Resort in Davis, West Virginia. The document details a subsurface exploration conducted on August 2, 2024, involving eleven soil probe locations to assess foundation conditions for a new ADA-compliant trail, observation platform, deck, and boardwalk. The proposed structures will be approximately 18 to 24 inches above existing ground elevations, with a 5-foot wide boardwalk running along the northwestern bank of Bubbling Spring and an 8 x 12 foot deck overlooking the stream and bog area.

The geotechnical investigation revealed challenging site conditions, with wetland soils characterized as soft, damp, and containing significant organic matter. Due to long-term settlement issues, the report recommends using helical pier foundations extended 5 to 6 feet below the surface. The recommended foundation system includes 1.5-inch diameter helical pier shafts with round-square shafts, three-inch helical bearing plates, and an uncased grout cap. The report suggests site-specific seismic design considerations and notes potential construction challenges such as soft soil, groundwater presence, and tree root interference. The project will require careful engineering and specialized foundation installation to ensure structural stability in the wetland environment.