This presentation will focus on a case study of an Industrial facility located in McMinnville, OR. This case study will review the stormwater challenges the facility dealt with including; consolidation of multiple drainage basins with various contributing pollutants, and compliance with strict permit regulations and potential future regulation through Oregon’s Department of Environmental Quality (DEQ). Finally, the case study will discuss what steps the facility did ahead of time in order to evaluate, select and implement a cost effective long-term stormwater treatment Best Management Practice (BMP).
This industrial facility (Facility) is a Materials Recovery Facility that accepts recyclables, bulky items, electronic waste, and a variety of other items. The Facility operates two solid waste related facilities on the same site in McMinnville, Oregon: the Northwest Greenlands-McMinnville (NWGM) composting facility and the Valley Recovery Zone Material Recovery Facility (VRZ-MRF). Both facilities share coverage under a 1200-Z Industrial Stormwater General Permit (ISGP), operated by DEQ. The 1200-Z Permit requires regularly monitoring of stormwater for various pollutants, some of which apply only to certain industries or receiving waters. Under the 1200-Z Permit, the Facility had experienced challenges in meeting benchmarks and reference concentrations for various pollutants, specifically Total Suspended Solids (TSS). Consequently, the Facility had triggered a Tier II corrective action, requiring the facility to provide stormwater treatment measures to fulfill the permit requirement.
PBS Engineering and Environmental (PBS) and Clear Water Services, LLC. (Clear Water), teamed up to assist the Facility in the design, permitting and installation of a stormwater treatment system that would meet Tier II DEQ requirements, while also incorporating existing landscape without altering current facility activities. The facility’s existing landscape included an existing swale (overgrown vegetation) and wetland. Runoff from each drainage basin was conveyed through the existing swale into a single outfall, than an adjacent wetland, east of the VRZ-MRF. With varying stormwater characteristics through a compost facility and MRF, the facility conducted some preliminary studies in order to narrow down treatment technologies. It was through this preliminary study and a pilot-scale treatment system that the facility was able to effectively determine which treatment technology and media and/or chemistry was suitable to retain compliance.
Through a design-build approach, Clear Water assisted PBS and the Facility through the following: water quality characterization, benchscale and treatability testing, pilot-scale treatment system implementation, stormwater design, fabrication, installation and long-term O&M. This presentation will follow the intricacies of the treatability study and how the treatability study affected the technologies chosen for the pilot-scale treatment system. The presentation will also present percent reduction data from each treatment technology and discuss why the technology was chosen.