The Hennepin Energy Recovery Center (HERC), located in downtown Minneapolis, is a waste-to-energy facility that burns garbage to generate energy. HERC provides reliable, renewable electricity that is sold to Xcel Energy and steam that supplies the downtown district energy system and Target Field. In 2013 Marcie performed civil engineering design services for the Inventory Storage Addition for HERC’s operator Covanta Energy. Steve managed the special inspections and testing while working for his former employer. The Inventory Storage Addition is a 5 story steel framed structure founded on steel pipe piles.