DERR-2024-013266

Site Visit Report- Redwood Road Dump VCP #121
Date(s): 8/29/22
Project Manager: Chris Howell.
Purpose of Site Visit: Initial Site Visit/ Site Walk
Observations:
DERR arrived on-site at 10:00 am to conduct the initial site walk. In attendance DERR Chris
Howell and Lincoln Grevengoed, Salt Lake City Corp Catherine Wyffels, Terracon Nancy
Saunders and Amy Findley, TOSA Tim Stay, Lew Swain and Joseph Grenny (departed early).
The site is located at 1850 W Indiana Ave in an industrial area. SLC is still using the site for
green waste mulching. We also observed the parks department using the area to store trash
and debris (appears to have come from cleaning up homeless encampments). Catherine was
not aware that the site was being used to store and sort trash. DERR mentioned that additional
characterization would be needed in this area.
The group walked along the road that roughly marks the western boundary of the VCP site. It
appears that MW-2 may have been damaged and can not be located and may need to be
repaired or reinstalled if the well can not be located or repaired. Due to the known contaminates
(PFAS) in the groundwater and variability in the flow direction DERR asked for another round of
groundwater sampling and groundwater elevation measurements. Terracon believes the PFAS
is migrating from the west where the landfill material is located.
TOSA had shared the preliminary thoughts/hopes on a remedy. The fill above the native will
need to be removed for geotechnical purposes and moved west onto another portion of the
Redwood Road Dump off of the VCP site but still owned by the applicant. This fill material that
needs to be relocated has not previously been sampled. I let the applicant know that we would
need the fill to be sufficiently characterized prior to proposing a remedy to ensure the fill does
not need additional disposal needs. I also recommended that the workplan include opportunity
samples to be collected if the field staff identifies any unknowns.
On the northern side on the historic Redwood Road Dump SLC is still actively adding to
wood/debris piles. These piles are off the VCP site and were not inspected. As the group
reached the northern edge of the VCP property we could see a few large clearings and test pits
completed by the UGS to map fault lines in the area. We could also see a low-lying area known
as the North Ditch. According to SLC and TOSA the source of the ditch is completely unknown
by the city and there are plans to put in a pipe to move water across the landfill. The ditch has
previously been sampled in historic events.
On the eastern portion of the site, Terracon has previously identified significant volumes of
debris encroaching onto the VCP site from the Alvie Carter Trust property. SLC had contacted
the owner and asked them to remove their debris. During our visit a back hoe was observed and
a significant amount of debris had been pushed over the property line. Some debris and burn
pits were observed remaining. The debris consisted of automotive, building debris, household
debris and slag created in the burn pits. Additional characterization will be needed in this area to
characterize what was left behind. Measures may be needed to prevent storm runoff from
washing potential contamination back onto the site.
Due to the open spaces I recommended that the applicant work with a surveyor to clearly mark
the VCP legal description of the site.
TOSA is very eager to get to a remedy on the site and asking many questions about the timeline
to being shovel ready. DERR let them know that we are going to be working to be as efficient as
possible but we are only on the ground floor of the program. There are numerous steps that
need to be followed in the VCP. Terracon and DERR laid out the steps to move forward;
1. DERR will review the EA and provide comments
2. QAPP
3. SC Workplan
4. DERR review and approval of SC Workplan
5. Conduct fieldwork and Analyze data
6. Compile data and write the SC Report,
7. DERR review and comment or accept the SC Report
(If data gaps are identified additional characterization may be needed)
8. Work with DERR to develop the RAP
9. 30-day public comment period, address any pubic comments
10. DERR accepts the RAP