FERC License Compliance 
Sigma has cost-effectively managed the license compliance issues associated with FERC hydro licenses across the US and in doing so has successfully addressed issues such as minimum flows, dissolved oxygen levels, wetland impacts, habitat impacts, and fish impingement and entrainment.

Tank Replacement Program
Sigma has managed the design, construction, scheduling, and budgets for the removal, replacement, upgrading, and repair of underground and aboveground storage tanks at over 1,000 locations in New England since 1991.  The total cost of this program has reached over $17,000,000.