SEH serves as prime consultant for a multidisciplinary team providing design, land-surveying, public involvement, and construction-related services to the Town of Castle Rock. SEH designed the roadway and utility improvements for over a mile of Gilbert Street between Plum Creek Parkway and South Street. The sanitary sewer trunk line was too small to meet flow demands, restricting the operations of an existing upstream lift station. This collection system was at maximum capacity during peak flow times and was in danger of surcharging sanitary manholes. Models and evaluation of the existing water infrastructure indicated that the existing water service mains were antiquated and undersized for future development needs.

Features

• Road widening including addition of center turn lane, bike lanes, curb, gutter, and detached walkways
• Pedestrian bridge provides off-street crossing of existing drainageway
• Upsized and replaced sanitary main
• Replaced antiquated, undersized water main
• Collection and conveyance of 100-year storm flows
• Biological Assessment for Preble’s Meadow Jumping Mouse
• Nationwide 404 Permit

SEH Services

• Provided preliminary survey of roadway and utilities for design
• Verified existing control and established new project control with GPS RTK methods using Trimble equipment and conventional leveling
• Surveyed topographic features using Sokkia equipment
• Modeled project with a one-foot contour using Autodesk Survey and AutoCAD Land Development Desktop
• Prepared descriptions and exhibits for right-of-way acquisitions and easements