S.R. 87 SLOPE STABILIZATION

Euthenics developed the S.R. 87 slope stabilization project design in two parts. Part 1 consisted of an alternatives analysis. As described in the request for qualifications, two retaining wall system types were considered: sheet pile and drilled shafts. The previously prepared Subsurface Exploration Report dated December 8, 2017 evaluated various buttress and sheet pile alternatives, and the project scope indicated that the buttress alternative had been eliminated from further consideration. The sheet pile alternative was a two-wall system with one wall located near the bottom of the slope and one wall located at the top of the slope. For the two-wall system, Euthenics recommended investigating a soldier pile/drilled shaft wall as an alternative because this wall type could be constructed with smaller equipment, which was beneficial given the challenging site access and terrain. A single drilled shaft/soldier pile wall located near the top of the slope was also investigated as an alternative to the two-wall system. Euthenics prepared a report comparing the alternatives for Village review and approval. Part 2 consisted of preparing contract plans, quantities, and specifications for the slope stabilization method approved in Part 1. Chagrin Valley Engineering, Ltd. provided basemapping information, including the existing ground digital terrain model, in AutoCAD format suitable for use in the slope remediation alternatives analysis and detailed design. CVE developed plans not related to the retaining wall system components.