Vigil-Agrimis, Inc (VAI) is part of a large, multi-disciplinary team working to design and permit TriMet’s Portland-Milwaukie Light Rail Project. VAI is involved in restoration services at each of the seven stream crossings along the proposed 7.3 mile urban rail corridor. VAI is responsible for the repair, relocation and extension of existing culverts and storm sewers, floodplain mitigation grading, mitigation planting, irrigation design, and permit drawings. VAI is coordinating closely with the design team and TriMet’s CAD staff to develop construction documents that conform to project standards. Services provided by VAI are described below.

Culvert and Storm Sewer Relocation
The culvert and storm sewer work includes a culvert repair and extension design at Crystal Creek, manhole and pipe relocations at Spring Creek, and repair and replacement of an existing storm sewer at Courtney Springs Creek. The existing 36” CMP culvert at Crystal Creek will be retrofitted using a slip-lining technique to repair the existing culvert without the need to disturb the existing railroad. The culvert will also be extended to accommodate a wider rail corridor. The design at Spring Creek includes the relocation of two manholes and jacking and boring a new 36” Concrete Pipe beneath the existing railroad. The design at Courtney Springs Creek includes replacement of 470 linear feet of 60” diameter concrete sewer pipe and 60”x48” concrete box culvert and chemical grouting rehabilitation of approximately 200 linear feet of existing box culvert.

Floodplain Grading Design
VAI is analyzing the impacts of fill material in the 100-year floodplain of both Crystal Springs Creek and Johnson Creek. VAI developed grading designs that remove material from each of the floodplains to offset unavoidable fills related to the rail corridor. We are strategically locating the floodplain cut areas to help remove invasive plant species, improve riparian habitat conditions, and contribute to the overall design aesthetic.

Mitigation Planting
For the segment of the proposed light rail within the City of Milwaukie, VAI is designing mitigation planting for two key areas where the rail corridor crosses protected waterways. These mitigation plant communities are designed to offset the temporary and permanent impacts of light rail construction at Kellogg Lake and an unnamed creek along the Trolley Trail. The plantings occur within Habitat Conservation Areas and Water Quality Resource Areas. The goal of the plantings is to create robust, self-sustaining riparian plant communities that provide habitat for fauna and help to enhance and protect water quality.

Permit Drawings
VAI is preparing permit drawings and narratives for the multiple jurisdictions that the rail corridor travels through. In particular, we are supporting permitting efforts within City of Portland Environmental Zones, and City of Milwaukie Water Quality Resource Areas and Habitat Conservation Areas.

Irrigation
VAI is designing an irrigation network for the entire rail corridor, including 8 stations, street tree areas, and mitigation planting areas. This irrigation system has nearly 60 points of connection and spans multiple jurisdictions.