An on-going TERRA.fluxus project in North Portland involves a number of tasks related to the mitigation of a post-industrial brownfield site along the Willamette River. This parcel abuts the river and used to be used for ship-building and repair activities, and has been out of use for some years. Overall remnant contamination was removed, and some structures were removed to ensure that pollution was stabilized, in anticipation for future use. In addition, an aggressive schedule of planting mitigation was required for selected areas to prevent erosion and provide vegetative cover.
Jason King and TERRA.fluxus was hired to provide preliminary planting recommendations based on the mitigation plans prepared by environmental consultants. This included consultation with property managers to consider types of planting, appropriate site coverage, and temporary irrigation systems. The scope also included annual review and reporting on the health of plant materials through 2012.
The initial remediation plan included a identification of a number of areas within the site that needed landscape coverage, either in the form of plantings, bark, or rock. These were in place to stabilize slopes and keep any exposed soil surface in place. The map below shows a range of required areas delineated in the initial site assessment.
A more detailed planting plan was completed for the buffer area to the SW corner of the site – including native buffer plantings that were required by regulatory agencies to mitigate site disturbance related to cleanup activities. A wide array of native plantings appropriate for riparian areas and the Willamette River Greenway were selected, including Incense Cedar, White Alder, and Big Leaf Maple. The understory was filled in with Red- and Yellow-Twigged Dogwood, Currants, Snowberry, Nootka Rose, Serviceberry and Evergreen Huckleberry – mimicking the dry upland edge of the river habitat.
After the initial planting, TERRA.fluxus provided initial certification of landscaping to City of Portland. A number of site photos show the initial plantings after 1 year. Overall there was some necessary replacement, but overall plant health was maintained and overall invasive weed coverage was minimal, particularly in the native planting mitigation areas. Some minor repairs to irrigation was required, as well as installation of a few replacement plantings, although both were minimal, due to the diligence of the owners property management team.
Stay tuned for more updates as annual reviews are completed, and an upcoming non-project related post about some of the unique site features of this parcel. It’s interesting to think of what the eventual best use of the property will be, as the parkland to the south and Port properties to the North expand, and the need for more access to the Willamette River continues.