HELIX Environmental Planning (HELIX) provided regulatory permitting assistance for the Commons at Prairie City project located in the City of Folsom. The proposed project required placement of fill into an isolated, seasonally-inundated depression on the site, which was assumed to be waters of the State and required a permit from the Central Valley Regional Water Quality Control Board. HELIX prepared the permit applications and managed agency coordination. Additionally, HELIX provided arborist services including a tree permit application for the removal of protected trees, a tree mitigation and preservation plan, and construction monitoring.