Sunset Road Environmental Assessment and Mitigation Report and Section 404 Permitting


The Pima County Department of Transportation is constructing Sunset Road: Silverbell Road to I-10 Eastbound Frontage Road–Segment I from Silverbell Road to the I-10 eastbound frontage road, including a bridge over the Santa Cruz River near Tucson, Arizona. Approximately half of the project limits occur within the 100-year floodplain limits of the Santa Cruz River. The Santa Cruz River flows southeast to northwest through the project area. EcoPlan prepared an Environmental Assessment and Mitigation Report for the project and assisted with Clean Water Act Section 404 permitting. The latter included delineation of jurisdictional waters of the U.S., including wetlands, within the project limits. Delineated waters included a perennial reach of the Santa Cruz River, ephemeral tributaries, and fringe wetlands along the river course. EcoPlan followed Corps guidance for delineation of waters and delineated wetlands following the 1987 Corps Wetlands Delineation Manual. EcoPlan prepared a Section 404 application permit for the project and has provided post-design services including special status species surveys and nesting migratory bird surveys.

 

El Corazon Bank Protection 404 Permitting


The Pima County Regional Flood Control District is planning to construct soil cement bank protection along the east bank of the Santa Cruz River and the south bank of the Cañada del Oro Wash and pedestrian bridges with connections to existing linear parkway segments at the Cañada del Oro Wash and the Rillito River in the town of Marana in Pima County, Arizona. EcoPlan assisted with Clean Water Act Section 404 permitting for the project. This included delineation of jurisdictional waters of the U.S., including wetlands, within the project limits. Delineated waters included a perennial reach of the Santa Cruz River, the ephemeral Cañada del Oro and Rillito River, smaller ephemeral tributaries, and fringe wetlands along the Santa Cruz River. EcoPlan followed Corps guidance for delineation of waters and delineated wetlands following the 1987 Corps Wetlands Delineation Manual. EcoPlan prepared a pre-construction notification requesting authorization under Nationwide Permit 13 (Bank Stabilization).

 

State Route State Route 89A, Oak Creek Canyon


The objective of this project was to repair existing embankment and/or provide new bank protection and to mitigate the erosion caused by stormwater flows and local overland flows along a section of State Route 89A along Oak Creek in northern Arizona. EcoPlan prepared environmental documentation for this project, including preparation of a wetlands delineation, Section 401 certification, a Section 404 individual permit, a hazardous materials evaluation, public and agency scoping, and preparation of two Categorical Exclusions and a superseding environmental clearance. Biological tasks involved close coordination with the U.S. Fish and Wildlife Service, formal Section 7 consultation assistance, and preparation of a Biological Evaluation.