The Other Side Village (TOSV) Environmental Information
Background
Salt Lake City owns a 70-acre parcel located at 1850 W Indiana Avenue. This parcel is a historical municipal landfill that accepted waste from 1923 to 1962. In the late 1970s, the landfill was bisected by the construction of I-215, creating a West Pile and an East Pile. Since the development of I-215, Salt Lake City has used portions of the East Pile and surrounding land for processing green waste; however, municipal dumping stopped in the 1960s.
The Other Side Academy (TOSA) is seeking approval to develop The Other Side Village (TOSV) pilot project within an 8-acre area in southeastern corner of the site, which is the area least impacted by past landfill activities. To accommodate the proposed development, the city council approved a rezone of the development site on October 18, 2022. For more background on the rezone of the site and associated agreements and approvals visit the Salt Lake City Council’s page.
On February 28, 2023, TOSA submitted a Planned Development application to the Planning Division for review. For more information on the Planned Development request, please visit Planning’s virtual open house page. The pilot project will provide housing and supportive services for those experiencing homelessness and struggling with substance abuse, mental illness and/or physical disability. This innovative project is a step toward creating more affordable housing choices and options for residents to thrive.
To ensure that the area is safe for residents, the City entered the site into the Utah Department of Environmental Quality’s (UDEQ) Voluntary Cleanup Program (VCP). Under the VCP, the City is working closely with regulators to investigate the pilot area and develop a remediation plan that will make the area safe for residential use. The City is also coordinating closely with TOSA to ensure that the sampling and remediation actions align with the TOSV development plans.
The City will only allow residents to occupy the site after the remediation is deemed complete by UDEQ.
Summary of Environmental Conditions
Several environmental investigations have been conducted at this parcel since the 1990s, but these investigations were focused primarily on the areas used as a landfill and not the pilot project area. Since the TOSV project started being considered in 2021, additional investigations have been conducted in the pilot area. This page summarizes the results of the pilot project area investigations since 2021.
Characterization of the site has included the collection of soil samples, groundwater samples, and soil gas samples for analyses of all potential environmental impacts associated with former landfills. Characterization and sample analyses has been conducted in coordination with UDEQ to ensure all potential impacted media, contaminants, and exposure pathways are identified and evaluated. After analyzing samples for an extensive list of potential contaminants, the following impacts were identified:
- Fill material was found to be impacted by one polycyclic aromatic hydrocarbon (benzo(a)pyrene) and two metals (arsenic and cadmium). Samples of native materials beneath the fill have reported impacts from arsenic; however, benzo(a)pyrene and cadmium have not been reported.
- Groundwater was found to be impacted by1,4-dioxane (a volatile organic compound), PFAS compounds (known as an emerging contaminant) and one metal (arsenic).
- Soil gas samples reported elevated concentrations of chloroform.
All compounds reported are chemicals that are commonly identified at residential, commercial, and industrial sites in developed cities.
Source: Site Characterization Report Redwood Road Dump Pilot Phase Project, Terracon, January 18, 2023
Remediation
The City is working with regulators to develop a remediation plan that will address the environmental concerns in the pilot area. Remediation strategies and exposure pathways will be carefully addressed to make development of this community safe for anyone living, working, or visiting the site. Some of the remediation strategies being considered include:
- Excavate impacted soils and dispose at a permitted facility or place below roads or in onsite repositories that will be constructed with protected covering
- Install vapor intrusion mitigation systems under buildings to prevent soil gas infiltration
- Implement institutional controls and engineering controls to manage any impacts remaining on site post-remediation, such as fencing, signage, routine groundwater monitoring, and inspections to ensure integrity of remedial actions
The final Remediation Action Plan will be available for review and public comment on DEQ’s website. This website will be updated with a link to the public notice when available.
While remediation will be conducted as part of construction of the TOSV, residents will only be allowed to live at the property after remediation is completed and DEQ issues a Certificate of Completion for the project (see Next Steps for more details).
Next Steps
The next steps and anticipated timeline for environmental tasks are listed below. This timeline is for informational purposes only and is subject to change.
- March 2023 – Additional sampling to define extent of soil contamination, finalize Site Characterization Report
- March/April 2023 – Finalize Remedial Action Plan
- April/May 2023 – Remedial Action Plan published for public comment
- Spring/Summer 2023 – Construction and remediation will start after the Remedial Action Plan is approved and all public comments are addressed
- Winter/Spring 2024 – DEQ will issue a Certificate of Completion after construction is complete and all remedies are put in place.
- Winter/Spring 2024 – City will issue Certificate of Occupancy after receiving the Certificate of Completion from DEQ
Resources
Project files related to the VCP efforts can be found on DEQ’s website: http://eqedocs.deq.utah.gov/
If you have any questions on the environmental work at this site, contact Catherine Wyffels in Sustainability (Catherine.wyffels@slcgov.com)