Four sites at a former AFB were originally opened due to VOC impacts. Two purge well fields and two P&T systems were constructed in the 1980s and 1990s to capture and treat groundwater migrating from the sites. Recent investigations identified PFOA and PFOS in groundwater at concentrations above regulatory cleanup criteria within the capture zones of the purge well fields. In 2018, an LGAC groundwater treatment system known as the Central Treatment System (CTS) was constructed to treat the groundwater recovered from two purge well fields. Bay West provided oversight while the CTS was being constructed and has operated, maintained, and optimized the CTS since it was brought online in August 2018.
The CTS was designed to treat PFOA and PFOS, but also captures and treats the VOCs present in the groundwater. The VOCs consume dissolved oxygen and create favorable conditions for iron/magnesium reducing bacteria that cause biofouling. The biofouling increases the pressure within the vessels and backwashing is required two to three times per week to keep the system operational. The backwashing generates a significant amount of water, which must be treated prior to being discharged. Bay West developed procedures to keep some of the purge wells online while the backwash water is being treated to maintain the desired capture zones. Bay West has also developed a comprehensive well rehabilitation procedure consisting of acid cleaning and pH enhanced disinfection to address the biofouling at the purge well fields. We are also evaluating filtration technologies including green sand filters as potential additions to the treatment train to reduce the biofouling.
The CTS is becoming a focal point for the restoration activities at this former DoD facility, as PFOA and PFOS are becoming the primary chemicals of concern. Since the CTS was designed, multiple stakeholder outreach efforts have been made, including the following tours to present the CTS:
• Restoration Advisory Board Construction Tour – April 2018
• Restoration Advisory Board Construction Completion Tour – August 2018
• Congressional Tour – September 2018
• Assistant Secretary of Defense Tour – April 2019
Bay West supported these stakeholder tours by preparing the CTS to eliminate potential hazards, developing tour narratives to highlight key aspects of the CTS design and operation, and leading the tours including question and answer sessions. In addition, Bay West supports the DoD in meetings where restoration activities are discussed with the project stakeholders and regulators. The on-site staff also perform routine site inspections and property owner interviews to verify that the land use controls are in compliance.
Excellent response time and made quick work of a cleanup with many moving parts.
PCBs Multi-Phase Cleanup
October 4, 2017
I have been extremely satisfied with Bay West services to date, and plan to continue our working relationship moving forward. Great Job!
Remediation, Groundwater Sampling
April 2, 2018
The team from Baywest is great! I appreciate how they are collaborative they are with us.
August 21, 2018
Our Bay West PM has proven to be a tremendous asset. Her hard work and dedication to the project are obvious and her customer service to the residents that we deal with is excellent.
Superfund Site Sampling
July 12, 2017
Bay West gains valuable experience to their Commercial Program by hiring new Industrial Services Group Manager. Bay West LLC, an environmental consulting and industrial services company headquartered in St. Paul, Minnesota, is pleased to announce the hiring of Josh Sima as their new Industrial Services Group Manager. Josh will be a key addition to their […]
Bay West’s growth continues with internal promotion of Donovan Hannu as Chief Operating Officer (COO). Bay West LLC, an environmental consulting and industrial services company headquartered in St. Paul, Minnesota, is pleased to announce the internal promotion of Donovan Hannu to Chief Operating Officer (COO), effective June 1, 2021. Mr. Hannu had been serving as […]
To celebrate Women’s History Month, we want to turn the spotlight on our company’s talented professionals, specifically our Women in STEM (Science, Technology, Engineering, Math). Enjoy our series featuring these accomplished women as we get to know more about the paths that have led each of them into successful careers in STEM. Click here to […]
Dr. Ramaswami Expands Bay West’s US EPA Program and Management Capabilities. Bay West LLC, an environmental consulting and industrial services company headquartered in St. Paul, Minnesota, has brought on Dr. Ram D. Ramaswami, Ph.D., P.E., BCEE, to manage Bay West’s US EPA program. Ram comes to Bay West with 40 years of experience in the […]