DERR-2024-011231

Monitoring Well
Installation Work Plan
Former Murray Fleet Facility
4400 South Main Street
Murray, Utah
October 7, 2024 | Terracon Project No. 61237057
Prepared for:
Lumen Technologies, Inc.
Broomfield, Colorado
6952 South High Tech Drive
Midvale, Utah 84057
P [phone]
Terracon.com
Facilities |Environmental | Geotechnical | Materials i
October 7, 2024
Utah Department of Environmental Quality
Division of Environmental Response and Remediation
Voluntary Cleanup Program
P.O. Box 144840
195 North 1950 West
Salt Lake City, Utah 84114-4840
Attention:Ms. Liberty Coe
Telephone: [phone]
Email:[e-mail]
RE: Monitoring Well Installation Work Plan
Former Murray Fleet Facility
4400 South Main Street, Murray, Utah
Terracon Project No. 61237057
Dear Ms. Coe:
Terracon Consultants, Inc. (Terracon) has developed this Monitoring Well Installation Work
Plan for the Former Murray Fleet Facility site located at 4400 South Main Street in Murray,
Utah, on behalf of Lumen Technologies, Inc. (Lumen).
Corrective action, consisting of excavation and disposal of impacted soil and groundwater
treatment has been completed at the site to address petroleum impacts originating from a
release from an underground petroleum storage tank owned by Lumen. This work plan is
designed to satisfy the requirement of the Utah Department of Environmental Quality (DEQ)
Division of Environmental Response and Remediation (DERR) for a minimum of two
consecutive groundwater monitoring events indicating that petroleum impacts to the
groundwater are below DERR’s Initial Screening Levels (ISLs) to complete closure of the
site.
Please contact Andrew Turner at 385-388-7028 if you have questions regarding this
information.
Sincerely,
Terracon Consultants, Inc.
Andrew S. Turner Amy Austin
Project Manager Authorized Project Reviewer
' P \ ' X V W L Q
Facilities |Environmental | Geotechnical | Materials ii
Table of Contents
1.0 Introduction ........................................................................ 1
1.1 Site Description ..................................................................................... 1
1.2 Project Information ................................................................................ 1
1.3 Objectives ............................................................................................. 2
2.0 Methodology ....................................................................... 2
2.1 Groundwater Sampling Event................................................................... 3
3.0 Groundwater Monitoring Report ............................................. 3
APPENDICES
Appendix A Exhibits
Exhibit 1: Topographic Site Overview
Exhibit 1: Proposed Groundwater Monitoring Well
Appendix B UDEQ DERR Letter Dated September 19, 2024
Facilities |Environmental | Geotechnical | Materials 1
1.0 Introduction
1.1 Site Description
Site Name Former Murray Fleet Facility
Site Location/Address 4400 South Main Street, Murray, Utah
General Site
Description
The entire site is approximately 1.94 acres occupying one
parcel. The site building has been demolished and the site is
currently under development.
Exhibit 1 (Appendix A) illustrates the approximate location of this parcel in relation to the
surrounding area.Exhibit 2 is a site diagram indicating the approximate locations of the
excavations conducted at the site and the proposed location for the monitoring well.
1.2 Project Information
The former Murray Fleet Facility site is located at 4400 South Main Street in Murray, Utah.
The facility had previously been operated by US WEST, Qwest Communications, and
CenturyLink (now Lumen) and included offices, fleet maintenance facilities, service vehicles,
and support equipment. The property is now owned by Evergreen – 45th & Main Land, LLC.
Two petroleum underground storage tank (UST) releases reported to the Utah Department
of Environmental Quality (UDEQ) Division of Environmental Response and Remediation
(DERR) were identified at the facility during ownership and operation by Lumen. One of the
releases, Release HDA, involved a former gasoline and diesel fuel UST area in the northern
portion of the site, and the second release, Release NCD, involved a former used oil UST in
the southern portion of the site. Site investigations, groundwater monitoring, and
remediation activities to address the releases were conducted from early 1990s to the
middle 2010s. A corrective action remediation was performed in 2013 with removal of
impacted subsurface soils, and post-remediation reports detailing this work in both areas
were submitted to DERR. Release HDA received regulatory “No Further Action” status from
the DERR in March 2014, and the northern portion of the site has since been redeveloped
for multifamily residential use.
However, a portion of the impacted soils of Release NCD could not be removed and was left
in place below the western portion of the facility’s maintenance building. DERR agreed to
wait until the on-site building located above a portion of Release NCD was demolished prior
to requiring further remedial action in that area.
Soil excavation, transportation, disposal, and groundwater treatment were conducted at the
site between August 16, 2024, and August 23, 2024 after the building was removed.
Monitoring Well Installation Work Plan
Former Murray Fleet Facility | Murray, Utah
October 7, 2024 | Terracon Project No. 61237057
Facilities |Environmental | Geotechnical | Materials 2
Backfilling and compaction continued at the site until August 27, 2024. The impacted soils
were transported to and disposed of at ET Technologies Soil Regeneration Site in Salt Lake
City (ET Technologies). Characterization sampling of the impacted soil was conducted per ET
Technologies requirements. Approximately 255 tons of petroleum-impacted soils were
transported to ET under proper waste manifest.
Upon completion of the soil excavation, a confirmation soil sample was collected from each
of the four sidewalls and one from the floor of the excavation. Confirmation samples
indicated that soil concentrations were below ISLs.
In order to treat the groundwater, a 55-gallon drum containing a 35% solution of hydrogen
peroxide was added directly into the groundwater at the bottom of the excavation via the
use of a pump and hose. Specific areas were targeted based on where residual
contamination appeared most likely to remain. After hydrogen peroxide application, 10
pounds of ferrous sulfate was added into the excavation to further advance the chemical
reaction.
A Corrective Action Implementation Report was issued by Terracon on September 16, 2024,
detailing the remediation work conducted at the site. The DERR sent a letter dated
September 19, 2024 (Appendix B), indicating post-remedial groundwater monitoring is
required to evaluate the effectiveness of the remedial action. Groundwater monitoring is
required to continue until two consecutive quarterly rounds indicate that petroleum impacts
to the groundwater are below ISLs.
1.3 Objectives
The objective of this Work Plan is to detail the monitoring well construction and sampling to
be conducted at the site in order to receive a No Further Action status for Release ID NCD.
2.0 Methodology
Prior to monitoring well drilling, the public utility location service (Blue Stakes) will be
notified at least 48 hours prior to digging or drilling as required by law. A subcontracted
private utility location service will be used to identify and mark subsurface utilities around
the planned excavation area. The monitoring well will be installed by a Utah-certified well
driller.
Based on the size of the excavation area and former remediation work performed on the
site, as well as current site development activities, Terracon proposes to install one
groundwater adjacent to the recent excavation area. The proposed location of the
groundwater monitoring well is shown on Exhibit 2. The monitoring well is expected to be
drilled via a direct-push drill rig to approximately 15 feet below ground surface (bgs).
Monitoring Well Installation Work Plan
Former Murray Fleet Facility | Murray, Utah
October 7, 2024 | Terracon Project No. 61237057
Facilities |Environmental | Geotechnical | Materials 3
Proposed well construction is as follows:
Installation of 10 feet of 2-inch diameter (15-5 feet bgs), 0.010-inch machine slotted
polyvinyl chloride (PVC) well screen with a threaded bottom cap.
Installation of 2-inch diameter, threaded, flush-joint PVC riser pipe to the surface.
Addition of silica sand pack for annular sand pack around the well screen from the
bottom of the boring to approximately 2 feet above the top of the well screen.
Placement of hydrated bentonite chips above the sand pack to just below the well
box (approximately one-foot bgs).
Installation of a traffic-rated, circular, bolt-down, steel, monitoring well cover with a
locking well cap inset in a flush-mount concrete well pad.
After installation and prior to sampling, the well will be developed per Terracon Standard
Operating Procedures.
2.1 Groundwater Sampling Event
Prior to collecting the groundwater sample for each event, the well will be purged using a
single-use disposable plastic bailer and twine which will be discarded after use. The water
meter used for depth to water measurements will be decontaminated using an Alconox
wash followed by rinsing with potable and distilled water. The well will be purged of a
minimum of three well volumes (calculated volume of water within the initial water column)
prior to sampling. Low-flow sampling may also be utilized as a substitute for well purging
using a bailer. Any odors or sheen observed during sampling will be noted. Purge water will
be thin-spread across the surface of the site and allowed to evaporate or infiltrate into
surface soils. The sample will be collected by a Utah-Certified Groundwater and Soil
Sampler.
The groundwater sample will be submitted to Chemtech-Ford Laboratories in Sandy, Utah,
for analysis of Total Petroleum Hydrocarbons (TPH) Gasoline Range Organics (GRO), TPH
Diesel Range Organics (DRO), Total Recoverable Petroleum Hydrocarbons (TRPH), and
methyl tert-butyl ether, benzene, toluene, ethylbenzene, xylenes, and naphthalene
(MBTEXN).
3.0 Groundwater Monitoring Report
A Groundwater Monitoring Report will be prepared after each monitoring event.
Groundwater results will be compared to Utah DERR ISLs and Tier 1 Screening Levels. Once
two consecutive rounds of groundwater sampling indicate that all analytes are below ISLs,
Terracon will request closure of the site with no additional land use restrictions.
Facilities |Environmental | Geotechnical | Materials 1
APPENDIX A
Exhibits
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Exhibit
terracon.comPH. 801-545-8500
6952 S High Tech Dr, Ste B
Midvale, UT
Reviewed By:
Drawn By:
Oct 2024
Date:
61237057
Project No.:
Former Murray Fleet Facility
4400 South Main Street
Murray, Utah
Proposed Groundwater Monitoring Well
2
ABA
AST
DATA SOURCES:
ESRI - Basemaps
@AMW-20
0 40 8020
Feet
³
³
@A Proposed Monitoring Well
Soil Excavation Area
Former UST
Historic Excavation Area
Approximate Site Boundary
Facilities |Environmental | Geotechnical | Materials
APPENDIX B
UDEQ DERR Letter Dated September 19, 2024
195 North 1950 West • Salt Lake City, UT
Mailing Address: P.O. Box 144840 • Salt Lake City, UT 84114-4840
Telephone [phone] • Fax [phone] • T.D.D. [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
ERRL-0409-24
September 19, 2024
CERTIFIED MAIL
RETURN RECEIPT REQUESTED
Stephanie M. Miller
Lumen
1025 Eldorado Boulevard 23-201
Broomfield, Colorado 80021
Re: Post Remediation Groundwater Monitoring
Former Murray Fleet, located at 4400 South Main Street, Murray, Utah
Facility Identification No. 4000598, Release Site NCD
Dear Ms. Miller:
On September 16, 2024, the Division of Environmental Response and Remediation (DERR)
received a Corrective Action Implementation Report for the above-referenced Site. After reviewing
this information, the DERR project manager has recommended further investigation to determine
the full extent of subsurface contamination.
The Corrective Action Plan for this site was approved by the DERR on August 1, 2023 and
remedial activities were carried out from August 16, 2024 through August 27, 2024. This included
the excavation and removal of 225 tons of contaminated soil and the treatment of groundwater.
Groundwater was treated by adding a 35% hydrogen peroxide solution and ferrous sulfate to the
bottom of the soil excavation. No groundwater samples were collected as part of the Corrective
Action. However, a Limited Subsurface Investigation conducted in April 2023 indicated
groundwater contamination above Initial Screening Levels (ISLs).
Due to the presence of contaminated groundwater, the Division Director is requiring Post-
Remediation Groundwater Monitoring to evaluate the effectiveness of the Corrective Action Plan.
Groundwater monitoring should occur quarterly until two consecutive sampling events indicate the
petroleum impacts to the groundwater are below ISLs.
All environmental samples must be collected by a Utah certified groundwater and soil
sampler following sampling protocol as outlined in Utah Admin. Code R311-205. The report
associated with these requirements must be submitted to our office within 90 days from the receipt
Facility ID# 4000598
Page 2
of this letter. Environmental samples must be analyzed for gasoline and diesel using the methods
indicated in the enclosed Table of Analytical Methods for Sampling.

If you have any questions regarding this matter, please contact Liberty Coe, the DERR
project manager, at [phone].

Sincerely,

Brent H. Everett, Director
Division of Environmental Response and Remediation

BHE/LC/rr

Enclosure: Table of Analytical Methods for Sampling

cc: Dorothy Adams, Executive Director, Salt Lake County Health Department
Jay Clark, Environmental Health Director, Davis County Health Department
Andrew Turner, P.G., Terracon Consultants, Inc.
Amy Austin, Terracon Consultants, Inc.
Analytical Methods for Environmental Sampling at
Petroleum Storage Tank Sites in Utah
(September 2022)

Substance or
Product Type
Contaminant Compounds to be Analyzed for Each
Substance or Product Type
ANALYTICAL METHODS1
Soil, Groundwater
or Surface Water

Gasoline
Total Petroleum Hydrocarbons (purgeable TPH as gasoline
range organics C6 - C10)
EPA 8015 or EPA 8260
Benzene, Toluene, Ethyl benzene, Xylenes, Naphthalene,
(BT EXN) and MTBE
EPA 8021 or EPA 8260

Diesel
Total Petroleum Hydrocarbons (extractable TPH as diesel
range organics C10 – C28)
EPA 8015
Benzene, Toluene, Ethyl benzene, Xylenes, and Naphthalene
(BT EXN)
EPA 8021 or EPA 8260
Used Oil
Oil and Grease (O&G) or
Total Recoverable Petroleum Hydrocarbons (T RPH)
EPA 1664 or
EPA 1664 (SGT*)
Benzene, Toluene, Ethyl benzene, Xylenes, Naphthalene
(BT EXN) & MTBE; and Halogenated Volatile Organic
Compounds (VOX)
EPA 8021 or EPA 8260
New Oil Oil and Grease (O&G) or
Total Recoverable Petroleum Hydrocarbons (T RPH)
EPA 1664 or
EPA 1664 (SGT*)
Other Type of analyses will be based upon the substance or product
stored, and as approved by the DERR Division Director
Method will be based upon the
substance or product type
Unknown
Total Petroleum Hydrocarbons (purgeable TPH as gasoline
range organics C6 - C10)
EPA 8015 or EPA 8260
Total Petroleum Hydrocarbons (extractable TPH as diesel
range organics C10 – C28)
EPA 8015
Oil and Grease (O&G) or
Total Recoverable Petroleum Hydrocarbons (T RPH)
EPA 1664 or
EPA 1664 (SGT*)
Benzene, Toluene, Ethyl benzene, Xylenes, and Naphthalene
(BT EXN) and MT BE; and Halogenated Volatile Organic
Compounds (VOX)
EPA 8021 or EPA 8260

1 The following modifications to these certified methods are considered acceptable by the DERR Division Director:
• Dual column confirmation may n ot be required for TP H and BTEXN/MTBE analysis.
• A micro-extraction or scale-down technique may be used for aqueous samples, but only for the
determination of extractable TP H as diesel range organics (C10 – C28).
• Hexane may be used as an extraction solvent.
• *Silica Gel Treatment (SGT) may be used in the determination of Total Recoverable P etroleum Hydrocarbons.
NOTE: The sample preparation method and any modification(s) to a certified method must be reported by the laboratory.