DERR-2024-009964

SITE VISIT REPORT
DATE: 8/14/2024
SITE: Chromalox VCP #073
SITE ADDRESS: 2150 North Rulon White Boulevard, Ogden UT 84404
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)
Michael Ozier (Tetra Tech)
Molly Wabel (Chromalox)
Jeremy Speas (Chromalox)
Nate Meyerhoffer (Chromalox)

ARRIVAL TIME: 9:15 AM - DEPARTURE TIME: 10:45 AM

SUMMARY: The purpose of the visit was for the new DERR project manager to meet the
Chromalox team and observe the installation of the passive vapor barrier installation for a section
of the new building expansion. The vapor barrier will extend the entire footprint of the new
building and Tetra Tech has been on-site for each of the vapor barrier installs. The vapor barrier
is followed by approximately six to twelve inches of dirt, road-base, and a foot of concrete. The
membrane sheets are overlapped and sealed. Five soil gas vent stacks were also identified. There
is only one section left of the new expansion needing a vapor barrier.
The site visit also consisted of walking the Site and identifying the active monitoring wells. The
status of some of the monitoring wells was unknown so Chromalox and Tetra Tech are going to
follow-up before the next monitoring event in September.

PHOTO LOG:

Photo 1: North-east corner (office space) of the new building expansion for Chromalox.

Photo 2: North end of the new building expansion (looking east).

Photo 3: Vapor barrier install inside of the building. The mat (material rolled up) lays underneath
the vapor membrane (yellow) to help direct vapors to the vent stacks. Dirt and road base are
next, eventually followed by concrete.

Photo 4: Application of dirt over the membrane.

Photo 5: Location for a soil gas vent stack.

Photo 6: Monitoring well MW-10B that will need to be followed up on before the next sampling
event.

Photo 7: Monitoring well GMW-6 and injection wells INJ-2, INJ-1, and INJ-6.

Photo 8: Monitoring and Injection wells inside area of concern (AOC) 6.

Photo 9: Monitoring well MW-18.