DERR-2025-001941

SITE VISIT REPORT
DATE: 03/12/2025
SITE: Redwood Road Dump
SITE ADDRESS: 1850 West Indiana Avenue, Salt Lake City, UT
PREPARED BY: Allison Stanley
Utah Department of Environmental Quality
Division of Environmental Response and Remediation
195 North 1950 West
Salt Lake City, UT 84116

ATTENDEES: Allison Stanley (DERR); Stephen Maliszeski (Terracon)
ARRIVAL TIME: 8:45 AM - DEPARTURE TIME: 12:00 PM
Is the work being performed in a manner consistent with the accepted workplan? Yes
SUMMARY:
The purpose of this site visit was to observe the installation of the vapor barrier for the Medical
Building. DERR met Terracon on-site at approximately 8:45 AM, who was there to inspect the
install. Due to windy conditions that day, they had laid down a portion of the barrier the day
prior. Terracon and the DERR observed some issues with the taped seal around the concrete
foundations and the pipes, and worked with the contractor to address. By 12:00 PM, the barrier
had been laid down for approximately half of the building footprint, but adequate sealing still
needed to be done for most of the pipes. Terracon was planning to come back for additional
inspections early that afternoon.

PHOTO LOG:

Photo 1: By mid-day, approximately half of the medical building footprint had the vapor barrier
laid down. Most of the piping in this area still needed to be adequately sealed.

Photo 2: View of the remaining footprint of the medical building. Four-inches of gravel
aggregate lays beneath the barrier.

Photo 3: Some small holes were observed in the membrane. As part of the inspection later that
afternoon, Terracon expressed that they would walk the membrane with the contractor and seal
these areas.

Photo 4: Initial taping around the piping. To ensure a proper seal, Terracon has requested that
another piece of the membrane be added over the pipes, to allow for the membrane to be taped to
the pipes directly.

Photo 5: Approximately 1.5 feet of overlap between sheets.

Phot 6: For some of the pipes, the plumbers were installing a drain, which needed to be several
inches below the final floor grade, putting the drain into the gravel aggregate. Here, a depression
in the gravel shows the pipe underneath.

Photo 7: To ensure that the membrane dropped low enough to seal around the pipe and allow for
enough space for the drain to glue on, some of the gravel around the pipe was removed. An extra
piece of membrane was added over the top and taped to the pipe and the surrounding barrier.

Photo 8: An example of the final taping for the pipes requiring a drain.