DERR-2024-005078

195 North 1950 West
Mailing Address: P.O. Box 144840 Salt Lake City, UT 84114-4840
Telephone [phone] ) 359-8853 [phone]
www.deq.utah.gov
Printed on 100% recycled paper
State of Utah

SPENCER J. COX
Governor

DEIDRE HENDERSON
Lieutenant Governor
Department of
Environmental Quality

Kimberly D. Shelley
Executive Director

DIVISION OF ENVIRONMENTAL
RESPONSE AND REMEDIATION

Brent H. Everett
Director
ERRC-034-24

March 14, 2024

Mike Gronseth
Kleinfelder
Senior Environmental Project Manager
849 West Levoy Drive, Suite 200
Taylorsville, Utah 84123

RE: Soil Management Report Butterfield Canyon Trail Construction, Salt Lake County
Parks & Recreation, Herriman, Utah

Dear Mr. Gronseth:

The Division of Environmental Response and Remediation (DERR) received the Soil
Management Report Butterfield Canyon Trail Construction, dated October 6, 2023. The report
covers the remedial action performed on approximately 1.7 miles of trail associated with the greater
multi-use trail system within Butterfield Canyon. This section of trail was previously identified to
have elevated levels of lead and arsenic present in the soil and is located within Operable Unit 3 of
the Kennecott South Zone.

The DERR s understanding is that the impacted soil was excavated to one foot below grade,
and the soils on the northern side of the trail were over excavated to 0.5 to one foot and transported
to the Blue Water Repository following characterization sampling. Confirmation soil samples were
collected from the top 6-inches of the soil, that were exposed following excavation, to determine
the concentrations of lead and arsenic in the soil. After the stockpiled soil was removed, an
additional one foot of soil was excavated below the stockpile footprint, and a confirmation
composite was collected below the footprint of the stockpile. The excavated areas were backfilled
with clean soil. The imported soil was monitored using XRF, and a 10-point composite sample was
collected to verify that the import soil was suitable for use on site. It is also our understanding that
an orange marker barrier was placed between the native soil and clean fill material before
backfilling. The DERR recommends regularly monitoring the remediated area for visible signs of
the orange marker barrier and managing any daylighting instances as appropriate under the Salt
Lake County maintenance plans for the trail system. Continued monitoring of the trail will ensure
that the remedy remains protective to the public.
Page 2
Based on our review of the Soil Management Report, this document has been accepted by
the DERR. If you have any questions, please contact me at [phone].

Sincerely,

Mazie J. Cox, Project Manager
Division of Environmental Response and Remediation

MJC\lg

ecc: Hayley Shaffer, Salt Lake County Health Department
Dustin Wiberg, Salt Lake County Parks and Recreation
Ron Lund, Environmental Health Director, Salt Lake County Health Department