DERR-2024-012692

SITE VISIT REPORT
DATE: 12/5/2024
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)
Nancy Saunders (Terracon)
Amy Austin (Terracon)
Catherin Wyffels (SLC)
ARRIVAL TIME: 8:30 AM - DEPARTURE TIME: 9:45 AM
Is the work being performed in a manner consistent with the accepted workplan? Yes

SUMMARY: The purpose of this visit was to observe the installation of a vapor barrier for three
structures on the northern half of the site. The DERR met with Terracon and SLC on-site. A
Vapor Intrusion Mitigation System (VIMS) was being installed for three locations (units 221 &
222, 228 & 229, 204 & 203). Each location was at various stages of install allowing the DERR
and Terracon to observe the entire process. These locations are slab-on-grade with a 20 mil vapor
barrier. An insulated foam was placed on top of the gravel aggregate, followed by the vapor
barrier. All seams were sealed off with tape. They expect to finish with all three locations by
later this afternoon, in which Nancy Saunders will inspect and ultimately sign off. The contractor
will then cover the barriers (including the one for unit 212 installed on 11/22/24) with concrete,
which is scheduled for tomorrow.
When the DERR and Terracon arrived, the weather was about 35 degrees Fahrenheit. Crews
were waiting to finish some of the taping until it got a little warmer.
PHOTO LOG:

Photo 1: Taping at units 228 and 229.

Photo 2: Taping at units 228 and 229.

Photo 3: Taping at units 221 and 222.

Photo 4: Placement of the 20 mil vapor membrane at units 203 and 204. The 4 inch layer of
gravel aggregate can be seen followed by an insulated foam, which will be topped with the vapor
membrane.

Photo 5: Vapor barrier install at unit 212 occurred on 11/22/24. It is currently covered with a tarp
until it will be covered with concrete, which is scheduled for tomorrow.

Photo 6: View of most northern section of the site. Sidewalks are expected to start next week.

Photo 7: No foundation work has begun for the southern half of the site.