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UNIVERSITY OF OREGON NORTH CAMPUS CONDITIONAL USE & WILLAMETTE GREENWAY PERMIT APPLICATION areas of the site that are in need of large-scale invasive plant removal. Restoration actions should focus on immediate benefit to riparian function, such as the removal of concrete riprap along the shoreline of the Willamette River. Pristine areas along the riparian corridor should be protected and enhanced to maintain a well-functioning ecosystem. The complete Riparian Assessment and Management Report is included as Exhibit B. 6.4 Infrastructure The site analysis phase of the project included an evaluation of utility infrastructure within and surrounding the project area for the purposes of supporting proposed development, as prepared by consultants with BHE Group. The evaluation focused on stormwater, sanitary sewer, and water systems, with additional analysis of existing steam, power, communications, and natural gas utilities within the study area. Soils and Groundwater Relatively thick deposits of fill are present in the project area, between Riverfront Parkway (on the east) and the Millrace (on the west). Fill deposits range from 5È-15È deep, and are predominantly 9È deep. Fill material in this area consists of silt with some sand and gravel, and may have significantly lower infiltration rates than the native sand and gravel soils. Geotechnical investigation and infiltration testing is recommended for future development. Seasonal high groundwater depth ranges from 10È-15È within the project area. Oregon Water Resources Department well log data indicates a similar depth to groundwater within the project area. Stormwater Stormwater runoff from the project area predominantly drains via sheet flow, and enters the Willamette River. The land slope within the project area is generally flat, with localized depressions throughout. A significant amount of stormwater is expected to infiltrate into the underlying soil. In areas where infiltration rates are low, runoff likely ponds at the ground surface before migrating overland to the river. Per Sheet C01 Storm Drain Plan (Exhibit A), existing public storm drain mains are located along Riverfront Parkway flowing north and south, Millrace Drive flowing west, and Franklin Boulevard flowing west. Two additional public lines exist to the north of the tracks, one of which has an existing destination point in the Willamette River. Potential future destinations points or extensions connect to the two lines to the north of the tracks, and both flow east. An additional potential future destination points or extensions may occur along the Millrace leading to the outfall. Existing private storm drain mains are located south of the tracks, predominantly to the west of Riverfront Parkway. Sanitary sewer Existing gravity-fed public sanitary sewer infrastructure is readily available to areas north of the railroad tracks and east of the Millrace, however gravity-fed sanitary sewer is not readily available for the building sites west of the Millrace. Per Sheet C02 Sanitary Sewer Plan (Exhibit A), existing public sanitary sewer mains are located along Riverfront Parkway flowing south, Millrace Drive flowing west, and Franklin Boulevard flowing west. One additional public line exists to the north of the tracks, which flows south. Potential future destinations points or extensions connect to public lines to the west of Riverfront Parkway. Existing private sanitary sewer mains are located south of the tracks, predominantly to the west of Riverfront Parkway and flow south. Cameron McCarthy FINAL SUBMITTAL | June 22, 2018 38