DERR-2024-012491

SITE VISIT REPORT
DATE: 11/22/2024
SITE: Redwood Road Dump
SITE ADDRESS: 1850 West Indiana Avenue, Salt Lake City, UT
PREPARED BY: David Bird
Utah Department of Environmental Quality
Division of Environmental Response and Remediation
195 North 1950 West
Salt Lake City, UT 84116

ATTENDEES: David Bird (DERR)
ARRIVAL TIME: 12:15 PM - DEPARTURE TIME: 1:50 PM
Is the work being performed in a manner consistent with the accepted workplan? Yes

SUMMARY: This was a site visit by the DERR to check on the status of the site. The DERR,
along with representatives of Terracon (Nancy Saunders, Amy Austin, and Andrew Turner)
observed installation of a 20 mil liner in the crawl space of the home being built on lot #212.
The liner is part of the Vapor Intrusion Mitigation System (VIMS) planned for certain homes in
this development. The DERR and Terracon had discussions with the contractor regarding the
requirements for taping of the of the seams, a minimum overlap of 12 inches between separate
pieces of liner material, and the fact that a slab of concrete is planned to cover this liner.

We also observed placement of rigid foam insulation at lots #221 and #222 in preparation for
two homes that will be built adjacent and connected with each other. The actual placement of
liner material for the VIMS was expected to commence at ~3:30 pm that day. Terracon was
planning a return to the site to observe this process.

Looking west at Lot #212. Placement of 20 mil liner material is underway. Pink/purple material
is rigid foam to underlay the liner. A concrete slab is to be poured over these materials.