Stormwater UIC System Remediation Design Services
City of Portland Bureau of Environmental Services

Category 2 UIC Remediation, Phase 2:
VAI provided engineering services for the design of the second phase of the Category 2 UIC Remediation Project. These UIC facilities are located in Southeast Portland where stormwater runoff has historically been managed by collecting runoff from roadways and discharging runoff into the UIC systems. We provided hydraulic/hydrologic design services for 25 sites to bring the facilities into compliance with DEQ standards. The remediation activities included sump abandonment, sump shallowing, design of subsurface infiltration facilities, and the design of green street facilities. Construction and remediation of these facilities was completed during the summer of 2011.

Category 3 UIC Remediation, Packages 2 and 3:
After providing remediation design services for the initial 25 facilities, VAI was contracted to provide hydraulic/hydrologic design services for the 56 additional facilities in order to bring them into compliance with DEQ standards. Professional services for this contract included the review of existing pre-design information, infiltration testing, coordination of right-of-way improvements with PBOT, and the preparation of plans, specifications, quantity takeoffs, an engineering cost estimate, and providing bid document support.

After VAI completed the 60% design and construction drawings for this project, BES was notified by DEQ that the separation distance between the seasonally high ground water and the bottom of the sump could be reduced from 10 feet to 5 feet. BES asked VAI to evaluate the implications of this new separation requirement. VAI engineering staff found that this new separation requirement would significantly reduce the amount of work necessary to make these existing facilities compliant with DEQ. Also as a part of this evaluation, the VAI design team directly tested the existing capacity of 10 facilities within the project, and developed a methodology for estimating the reduced capacity of a shallowed sump.