NV5 provided full construction management and construction staking services for this $25 million roadway widening and interchange reconstruction project. The project widens Kiernan Avenue from two lanes to four lanes in each direction, improving freeway access as well as the entrance to downtown Salida, California.
Activities include constructing a new pump station, replacing an existing bridge spanning SR 99, and reconstructing SR 219 and associated freeway ramps. The project was constructed to Stanislaus County Standards with Caltrans oversight. There were four stages of construction to accommodate traffic, numerous utility relocations, and demanding SWPPP challenges, as project runoff flows directly to the Stanislaus River.
Elements of the work include constructing a new storm water pump station on SR 99, replacing the existing overcrossing bridge spanning SR 99, and reconstructing SR 219 and associated freeway ramps. The new 2 mgd storm water pump station with a 300,000-gallon storage basin was constructed 40 feet below original ground and 16 feet below the water table. The project also included a 180-foot long box culvert and a 170-foot long 96″ pipe culvert. The project required extensive shoring, as well as dewatering using a combination of seal courses and sump pumps with drawdown wells.