Myrtle Point Treatment Plant and Pump Station

PBS supported the Civil West Engineering Services Team by providing geotechnical evaluation, environmental screening, and wetland delineation and mitigation for the design of a new wastewater treatment facility for the City of Myrtle Point, Oregon. Two types of treatment systems were being considered for the site: Sequencing Batch Reactor (SBR) and a Biolac Facility (Biolac). In order keep construction costs down, significant consideration was given to the the presence of wood-waste fill (a by-product of historic use of the site to support a mill) and how much could remain in-place. The historic use of the site lead to additional concerns related to potential presence of subsurface contaminants.

PBS provided a geotechnical investigation to explore subsurface conditions at the site to provide the basis for 30%-design-level geotechnical recommendations for site development and foundation design. Work included geologic reconnaissance, and field exploration (both borings and test pits). While the test pits were primarily for environmental screening, PBS logged the data for use during the next phase of the project, thus saving the Client the added cost of an additional investigation.

A geotechnical feasibility report was prepared containing the results of our work and addressing the general suitability of the site for the proposed construction. Cost-sensitive issues such as excavation, grading, deep foundations, and use of onsite materials were assessed.

PBS conducted environmental screening for the site, including historical research, public records search, and tenant/City staff interviews. A Field Screening Analysis was conducted to collect evidence of environmental contamination. Where the field results indicated potential contamination, PBS collected additional soil samples and submitted them for laboratory analysis. Staff then prepared a report presenting our findings and providing conclusions and recommendations regarding the possible presence of hazardous substances that could impact the site.

PBS also prepared a Wetland and Waters Delineation Report for the project. Work included a background investigation of public records, fieldwork to delineate wetland boundaries, and report preparation. A Biological Assessment was prepared in accordance with the requirements of the National Marine Fisheries Service (NMFS), U.S. Fish and Wildlife Service (USFWS), and the U.S. Army Corps of Engineers (Corps).

Civil West Engineering | City of Myrtle Point
Coos Bay, Oregon

Scope of Services:

  • Geotechnical Engineering
  • Geo-Environmental Screening
  • Foundation Recommendations
  • Wetland Delineation
  • Wetland Functional Assessment
  • Environmental Permitting