Design and construction of the City of Napa’s Compost Facility improvements included a covered aerated static pile (CASP) drying system consisting of covered concrete bunkers with in-slab aeration piping to expedite the composting process. The project also included modifications to the facility’s existing stormwater management system through a series of earthen settling and filter ponds. The scope of work included site development, structural concrete, installation of all process equipment such as digester access doors, pipe chases, biogas upgrading skid, hydronic boiler, and flares. The project received the Dave Hardy Leadership in Organics Award in 2021 and was named Large-Scale Compost Manufacturer of the Year in 2023 by United States Composting Council.
