Buena Vista and Parkside Drive Safe Routes To School Project (Walnut Creek): The project involved roadway widening, sidewalks, curb and gutter, a reinforced modular retaining wall, drainage improvements, and use of twin steel reinforced HDPE pipe culverts for conveying an existing stream through the project site. Adjacent property walkways and driveways required special attention to design detail development.
Galindo Creek Trail (Concord): Harrison Engineering Inc. led the design for this trail project that closed a critical gap in the California Riding and Hiking Trail system (part of the East Bay Regional Parks District trail system). The project is between Galindo Creek and Ygnacio Valley Road in the City of Concord. The segment of trail that HEI designed provides local residents access to a wide array of regional trails and open space throughout central Contra Costa County, including Mt. Diablo State Park.
The design included an 8-foot wide decomposed granite trail and a 120-foot long section along the trail that required slope stabilization. HEI Value Engineered the slope repair by utilizing a concrete and tie-back retaining wall at the edge of shoulder. This option saved approximately $250K in construction costs over the original geotechnical recommendation. Additional project elements included: retaining walls along the trail alignment, reuse of an existing steel truss bridge from another location, storm water pollution control, traffic handling plans, utility relocations, and drainage improvements. The total construction cost was $1.2 Million.
The design included an 8-foot wide decomposed granite trail and a 120-foot long section along the trail that required slope stabilization. HEI Value Engineered the slope repair by utilizing a concrete and tie-back retaining wall at the edge of shoulder. This option saved approximately $250K in construction costs over the original geotechnical recommendation. Additional project elements included: retaining walls along the trail alignment, reuse of an existing steel truss bridge from another location, storm water pollution control, traffic handling plans, utility relocations, and drainage improvements. The total construction cost was $1.2 Million.
Woodbine Pedestrian Bridge (Danville): HEI led the project team for this $400K pedestrian bridge replacement project, which involved CEQA documentation, regulatory permitting, geomorphology analysis for siting the new bridge, HEC-RAS analysis, and preparation of PS&E. The PS&E package included demolition plans, planting plans, erosion control, layout and structural plans.
Sycamore Avenue Pedestrian Improvement Project (Mill Valley): HEI provided the PS&E for this federally funded pedestrian improvement project, which involves the construction of a bike path connecting the multi-use path on Camino Alto to the Sausalito-Mill Valley bike path.