DERR-2024-009960

SITE VISIT REPORT
DATE: 8/13/24
SITE: Redwood Road Dump VCP #121
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)
JR Murphy (Terracon)

TIME: 7:30-9:30 AM and 11:00-12:00 PM
Split Samples Collected: No
Is the work being performed in a manner consistent with the accepted workplan? Yes

SUMMARY:
DERR arrived on-site with Terracon at 7:30 AM to oversee the installation of the Vapor
Intrusion Mitigation System (VIMS) at the Pavilion. A safety briefing was conducted among
DERR and Terracon. Upon arrival, the contractor (Big D) was filling the footprint of the
Pavilion with gravel before laying down the membrane. The membrane installation occurred at
approximately 8:20 AM. The install consisted of laying down one sheet at a time with
approximately 2 feet of overlap between sheets. For places with exposed rebar, the membrane
was cut and later taped so that the membrane extended a few inches past the rebar. For areas with
no rebar, the membrane extended a few inches up the concrete. When the DERR left the Site,
Big D was working to seal areas around the piping. Terracon was back on-site later in the day for
oversight and to ensure that the exterior was sealed properly.
For other areas around the Site, most of the Site looked to be up-to-grade with fill material.
Terracon conducted confirmation samples a few weeks prior to define the extent of
contamination at TP-37 and identify impacts underneath the asphalt pad. The impacted material
at TP-37 was excavated and taken to a disposal facility on August 14, 2024. The asphalt tested
clean and was being trucked off to a recycling facility or landfill. The soil underneath the asphalt
will be stockpiled and sampled to verify that it’s clean and can go to the west-adjoining property.

PHOTO LOG:

Photo 1: Gravel layer that will be underneath the membrane for the Pavilion.

Photo 2: Laying down the membrane.

Photo 3: Cuts of the membrane to allow for rebar.

Photo 4: Membrane up against the concrete.

Photo 5: Multiple sheets of membrane with approximately 2 feet of overlap.

Photo 6: Fill material looks up-to-grade (looking north-east).

Photo 7: Looking south-east.

Photo 8: Asphalt pad has been removed and is being trucked to a recycling facility or landfill.
The soil underneath the asphalt will be stockpiled and sampled to verify that it can go to the
west-adjoining property.

Photo 9: Location of TP-37 where impacted soils will be excavated and disposed of accordingly.