DERR-2024-011500

Prepared for:

REH Marketing, Inc.
550 East South Temple
Salt Lake City, Utah 84130

Amended Additional
Site Investigation Work Plan
Basin Markets #105
5380 South 900 East
Murray, Salt Lake County, Utah
Utah Release Site: MRR
Prepared by:

186 East Main Street,
Suite 99
Sandy, Utah 84070
[phone]
www.broadbentinc.com

October 17, 2024

Project No. 23-14-106

October 17, 2024 Project No. 23-14-106

REH Marketing, Inc.
550 East South Temple
Salt Lake City, Utah 84130

Attn.: Mr. Scott Mayeda, Vice President/General Counsel

Re: Amended Additional Site Investigation Work Plan, Basin Markets #105, 5380 South 900
East, Murray, Salt Lake County, Utah. Release Site: MRR. Work Plan: MRR-15

Dear Mr. Mayeda:

Broadbent & Associates, Inc. is pleased to submit this Amended Additional Site Investigation Work
Plan which was prepared to assist with evaluating residual subsurface impacts of hydrocarbon mass
associated with the Basin Markets #105 (Former Sinclair #43005) site located at 5380 South 900 East
in Murray, Salt Lake County, Utah (Site or Basin Markets #105). Additional Site investigation activities
were requested to be conducted by the Utah Division of Environmental Response and Remediation
(DERR) in their July 3, 2024 letter. Additional Site investigation actions will include installation of four
(4) groundwater monitoring wells (MW-23 through MW-26) and conduct of one groundwater
monitoring and sampling event on Site associated wells.

Please do not hesitate to contact us directly at [phone] if you should have questions or require
additional information.

Sincerely,
BROADBENT & ASSOCIATES, INC.
Aric C. Morton, PG
Principal Geologist
Certified UST Consultant CC 0276 (expires 12/31/25)

TABLE OF CONTENTS

1.0 INTRODUCTION .............................................................................................................. 1
1.1 Site Setting ..................................................................................................................... 1
1.2 Generalized Site Background ......................................................................................... 1
2.0 ADDITIONAL SITE INVESTIGATION ACTIVITIES ................................................................ 2
2.1 Permitting and Utility Clearance.................................................................................... 2
2.2 Health and Safety Plan Preparation .............................................................................. 2
2.3 Soil Boring and Monitoring Well Installation ................................................................ 3
2.4 Soil Sampling .................................................................................................................. 3
2.5 Laboratory Analysis........................................................................................................ 3
2.6 Well Development and Groundwater Sampling ........................................................... 3
2.7 Site Surveying ................................................................................................................. 4
2.8 Investigation-Derived Residuals Management ............................................................. 4
3.0 GROUNDWATER MONITORING EVENT ........................................................................... 4
4.0 SITE INVESTIGATION AND GROUNDWATER MONITORING REPORT ............................... 4
5.0 GENERAL PROJECT MANAGEMENT AND REIMBURSEMENT PACKET .............................. 5
PREPARATION ................................................................................................................. 5
6.0 SCHEDULE & COST ......................................................................................................... 5
7.0 LIMITATIONS .................................................................................................................. 5

LIST OF FIGURES

Figure 1: Site Map with Proposed Monitoring Well Locations

LIST OF APPENDICES

Appendix A: Cost Estimate

Broadbent & Associates, Inc.
Salt Lake City, Utah
Amended Additional Investigation Work Plan
Basin Markets #105/Murray
October 17, 2024
Page 1

1.0 INTRODUCTION

Broadbent & Associates, Inc. is pleased to submit this Amended Additional Site Investigation Work
Plan (Work Plan) which was prepared to assist with evaluating residual subsurface impacts of
hydrocarbon mass and address data gaps associated with the Basin Markets #105 (Former Sinclair
#43005) site located at 5380 South 900 East in Murray, Salt Lake County, Utah (Site or Basin Markets
#105). Activities documented in this Work Plan were requested to be conducted by the Utah Division
of Environmental Response and Remediation (DERR) in their July 3, 2024 letter. Additional Site
investigation actions will include installation of four (4) groundwater monitoring wells (MW-23
through MW-26) and conduct of one groundwater monitoring and sampling event on Site associated
wells.

DERR requested the following scope of work in their July 3, 2024 letter, to be undertaken as part of
this Work Plan:

1. Perform one (1) round of groundwater sampling for all the monitoring wells associated with
this Site.
2. Install two (2) monitoring wells in the northern dispenser area to delineate the soil and
groundwater contamination in this area.
3. Install one (1) monitoring well near the southwest corner of the Italian Village Restaurant,
and another monitoring well (1) near the storm drain located on the east side of existing
MW-11.
4. Collect representative soil samples from the four (4) borings during installation of the ne
monitoring wells.
5. Analyze collected soil and groundwater samples for TPH-GRO, TPH-DRO, BTEXN, and MTBE
by a Utah ELCP-certified laboratory.
6. Submit a monitoring well installation and groundwater sampling report that includes the
following information:

a. A comprehensive data table with all groundwater analytical results and depths to
groundwater (historic and current).
b. A comprehensive data table with all soil analytical results including sampling dates and
sampling depths.
c. Laboratory reports and chain-of-custody documentation including Utah DERR-certified
sampler information.
d. A groundwater gradient map depicting the groundwater flow direction.
e. A figure depicting Site groundwater monitoring wells, and other relevant Site features.

1.1 Site Setting
Basin Markets #105 is located in the northwest corner of the intersection of S 900 E and E 5400 S. The Site
is bounded to the north by the Italian Village restaurant and a commercial parking lot, to the south by E
5400 S, to the east by S 900 E and to the west by the same commercial parking lot. The primary use of
surrounding properties is commercial. It appears that the closest residential area is approximately 500
feet northeast of the Site. The Site is depicted in Figure 1.

1.2 Generalized Site Background
The following is a generalized Site background summary. Semi-annual groundwater monitoring and
sampling has been ongoing roughly at the Site since 2014. Twenty-two groundwater monitoring wells have
been installed to monitor residual petroleum hydrocarbon impacts associated with the Site, including at
Broadbent & Associates, Inc.
Salt Lake City, Utah
Amended Additional Investigation Work Plan
Basin Markets #105/Murray
October 17, 2024
Page 2

both on and off-Site locations. The locations of existing groundwater monitoring wells and other features
associated with the Site are depicted on Figure 1. As of February 2021, the installed network of
groundwater monitoring wells appears to have adequately delineated dissolved petroleum hydrocarbon
perimeter impacts with the limited exclusion of specific areas that are the subject of this Work Plan.
Residual impacts consist of dissolved-phase hydrocarbon mass of benzene and total petroleum
hydrocarbons (TPH), both gasoline range organics (GRO) and diesel range organics (DRO), which are
primarily observed in on-Site groundwater monitoring wells.

Broadbent submitted the August 11, 2023 Corrective Action Plan (CAP) which proposed implementation
of remedial action via ISCO methods utilizing DeepEarth Technologies, Inc., (DeepEarth) to design and
implement their Cool-Ox® ISCO process at the Site.

2.0 ADDITIONAL SITE INVESTIGATION ACTIVITIES

The purpose of this Work Plan is to address data gaps associated with residual subsurface impacts prior to
consideration of remedial action. As previously stated, four (4) borings will be installed to facilitate
collection of soil samples and will be completed as groundwater monitoring wells for future sampling.
Review of Figure 1 indicates that new groundwater monitor wells will be installed in the following
locations: one (1) monitoring well (MW-26) will be installed east of MW-11 and the adjacent storm
water drain east of the Site’s c-store building; one (1) monitoring well (MW-23) near the southwest
corner of the Italian Village Restaurant, and two (2) monitoring wells (MW-24 & MW-25) will be installed
in the northern section of the fueling canopy east and west of previous boring B-2. Additional details
regarding subsurface sampling and monitoring well installation are provided below. It is also
recommended that three (3) existing monitoring well vaults be replaced due to damage.

2.1 Permitting and Utility Clearance
Project setup activities will initially include contracting with a Utah licensed drilling contractor to perform
well installation activities. Broadbent will coordinate the drilling schedule, and the driller will obtain
appropriate permits as required. Broadbent will verify that an existing or a new access agreement will be
completed prior to implementation of field work. Broadbent will mark the proposed drilling locations and
ensure that the drilling contractor notifies Blue Stakes of the pending work a minimum of five (5) days
prior to initiating field investigation. Broadbent will contract with a private utility locating company as
additional measures for subsurface utility clearance. The borehole location will also be cleared to a depth
of 6.5 feet bgs using a hand auger or air knife vacuum rig by the drilling contractor prior to borehole
advancement. Finally, Broadbent will provide adequate notification of drilling activities to appropriate
parties.

2.2 Health and Safety Plan Preparation
Before work is initiated, an existing Health and Safety Plan (HASP) will be updated/modified for worker
protection and hazard identification. The HASP will be Site specific and include the following at a minimum:

• Site and task specific hazards;
• Information on chemicals to be in use (SDS);
• Directions and map to nearest hospital; and
• Contact information for utilities, Pilot, and Broadbent.

A copy of the HASP will be provided to the Utah State licensed drilling contractor to inform them of
potential hazards associated with the Site and emergency procedures.

Broadbent & Associates, Inc.
Salt Lake City, Utah
Amended Additional Investigation Work Plan
Basin Markets #105/Murray
October 17, 2024
Page 3

2.3 Soil Boring and Monitoring Well Installation
Monitoring wells MW-23 and MW-26 will be installed off-Site while MW-24 and MW-25 will be installed
on-Site. Broadbent has been contacted by other consulting companies regarding conduct of a Phase I
environmental site assessment on the adjacent property and is assuming ownership has changed. With
that stated, Broadbent will coordinate off-Site property access to verify approval for well installation.
During drilling activities, soil cuttings will be described by the on-Site Broadbent representative using the
Universal Soil Classification System (USCS) in accordance with ASTM D 2488-93 Standard Practice for
Description and Identification of Soils (Visual-Manual Procedure). Soil cuttings will be examined using
visual and manual methods for parameters including odor, staining, color, grain size, and moisture
content. Drill cuttings will be monitored with a photo-ionization detector (PID), and placed in labeled 55-
gallon drums, prior to temporary storage for ultimate disposal. Broadbent’s representative will also be a
Utah-certified sampler and project oversight will be conducted under the direction of a Utah UST
Consultant.

The monitoring wells will be constructed of two (2)-inch diameter Schedule 40 PVC pipe. The total depth
of each well is proposed to be approximately 13.5 feet bgs. The screen interval will consist of 10 feet of
0.010-inch factory slotted screen extending from approximately 3.5 feet bgs to approximately 13.5 feet
bgs. Blank casing will extend from 3.5 feet bgs to just below land surface. Clean washed silica sand will
extend from total depth drilled to approximately 3.0 feet bgs. Approximately 1.0 ft of bentonite clay will
be placed above the sand interval and hydrated in place as part of the annular seal. Neat cement grout
will be placed above the bentonite plug completing the surface seal. Wellheads will be secured with locking
well caps and protected by traffic rated well vaults installed just below local land surface(s) to prevent
damage. Three (3) existing monitor well vaults at MW-6, MW-8, and MW-12 will be replaced during this
drilling event.

2.4 Soil Sampling
The soil boring will be continuously cored, if possible, to assist with lithologic classification, PID monitoring,
and soil sample collection. Soil samples will be collected for laboratory analysis at approximate intervals
of five (5) feet. An additional sample will be collected at the groundwater interface based on depth to
groundwater measured in adjacent existing wells. It is assumed that at least two (2) samples per boring
will be collected for laboratory analysis.

2.5 Laboratory Analysis
Collected samples will be submitted to Chemtech-Ford Laboratories in Sandy, Utah. Chemtech-Ford is a
Utah State-certified environmental laboratory which will conduct the following analysis: GRO and
DRO by EPA Method 8015B; Benzene, Toluene, Ethylbenzene, Total Xylenes, and Naphthalene
(BTEXN) by EPA Method 8260B; and for Methyl Tert-Butyl Ether (MTBE) by EPA Method 8260B as
well.

2.6 Well Development and Groundwater Sampling
Broadbent will mobilize with DPS to initiate well development activities approximately 72 hours after well
installation. Well development will consist of surging and pumping each well until relatively silt free water
is removed. After development, the wells will be left to hydraulically equilibrate for approximately 48
hours prior to water level measurement and sampling. The new wells will be included in the subsequent
Site-related groundwater monitoring event described below in Section.

Broadbent & Associates, Inc.
Salt Lake City, Utah
Amended Additional Investigation Work Plan
Basin Markets #105/Murray
October 17, 2024
Page 4

2.7 Site Surveying
New monitoring wells will be surveyed based on the existing Site datum by Broadbent personnel to
support generation of a new Site figure.

2.8 Investigation-Derived Residuals Management
Residual solids and liquids generated during the Site investigation activities will be stored temporarily on-
Site in appropriately labelled Department of Transportation (DOT) approved 55-gallon drums pending
analytical results and profiling. Drummed wastes will be scheduled for transport to an appropriate facility
for treatment or disposal following the receipt of the certified laboratory analytical reports for analyses
run on their contents.

3.0 GROUNDWATER MONITORING EVENT

Broadbent will conduct a groundwater monitoring and sampling event utilizing 31 monitoring wells
associated with the Site (MW-1 through MW-26, SV-1, EW-1, EW-2, EW-3, and A-1-1). Depth to
groundwater and the presence of LNAPL will be measured in each well prior to sampling using an oil/water
interface probe (OWIP). Monitoring wells containing a sufficient volume of groundwater and lacking
measurable LNAPL will be purged and sampled. Monitoring wells suitable for sampling will be purged
utilizing low-flow methods until general water quality parameters stabilize (temp., pH, conductivity, etc.).
Purged groundwater from wells without measurable LNAPL will be poured over an impervious surface on
Site and allowed to evaporate.

Monitoring wells that do not already have dedicated tubing will have it installed from which groundwater
samples will be collected in laboratory-provided volatile organic analysis (VOA) containers utilizing a
submersible low-flow electric or peristaltic pump. The electric pump, if used, will be decontaminated prior
to its use in each well. Samples will be submitted on ice, under chain-of-custody procedures, to Chemtech-
Ford. Groundwater samples will be analyzed for the same constituents described above in Section 2.5.

Site-associated monitoring wells with measurable LNAPL present will not be sampled but will be hand
bailed utilizing a new poly bailer until either the well is bailed dry, measurable LNAPL is no longer detected,
or until there is a consistent LNAPL thickness after three casing volumes of groundwater have been
removed. Recovered LNAPL will be placed in 55-gallon drums and stored at the Site until enough is
generated to warrant disposal. LNAPL disposal costs are not included in this Work Plan.

4.0 SITE INVESTIGATION AND GROUNDWATER MONITORING REPORT

Broadbent will prepare a report summarizing Site investigation and groundwater monitoring activities as
requested in DERR’s July 3, 2024, letter. The report will document fieldwork and laboratory analytical
results and will include at a minimum the following information:

• Description of field activities associated with Site investigation drilling, sampling, and
groundwater monitoring
• Monitoring well construction and lithologic logs
• Comprehensive soil and groundwater analytical data tables
• Site location and layout figures
• Groundwater potentiometric surface and analytical results figures
• Groundwater sampling data sheets
• Project-related photographs (if required)
• Laboratory analytical reports
Broadbent & Associates, Inc.
Salt Lake City, Utah
Amended Additional Investigation Work Plan
Basin Markets #105/Murray
October 17, 2024
Page 5

• Discussion and recommendations

5.0 GENERAL PROJECT MANAGEMENT AND REIMBURSEMENT PACKET
PREPARATION

Broadbent will provide project management and oversight of field staff. A PST Fund Reimbursement
Packet will be prepared after conduct of field work with a second submittal expected after submittal of
the summary report.

6.0 SCHEDULE & COST

Broadbent will make every attempt to carry out field work associated with this Work Plan; however,
contractor availability may delay proposed activities. It is estimated that field work associated with
well installation may require two (2-2.5) days based on Site-marking, utility location, monitoring well
installation, and existing vault replacement. Well development and surveying are expected to
require approximately one-half (0.5) day. Groundwater monitoring is expected to require up to
three (3) days based on sampling of 31 monitoring wells. It is anticipated that a summary report will
be submitted to DERR within 60-70 days after receipt of authorization to proceed in provided. Off-
Site access for new monitoring well installation may require additional time.

Anticipated costs associated with Work Plan activities are estimated at $32,521.45. These costs were
developed based on the Utah PST Fund Guidelines.

Preparations to conduct the proposed work will commence upon approval of this Work Plan. The
total anticipated cost to complete project-related activities described herein is presented below. A
detailed breakdown of costs is attached as Table 1.

Task 1: Work Plan Preparation & Site Access $ 1,200.00
Task 2: Monitoring Well Installation, etc. $14,230.65
Task 3: Monitoring Well Development & Surveying $ 1,956.83
Task 4: Groundwater Monitoring/Sampling Event $ 7,383.98
Task 5: Site Investigation and GWM Report Preparation $ 7,750.00

Cost Estimate $32,521.45

7.0 LIMITATIONS

Discovery of hazardous conditions not reasonably anticipated or addressed in the scope of this associated
Work Plan, which may impact REH Marketing, Inc., or other Site personnel associated with field work, may
constitute a changed condition mandating re-negotiation of the scope of work described herein or
termination of services. Broadbent will do its best to alert REH Marketing, Inc. of matters which, in the
opinion of Broadbent require immediate attention to protect public health, safety, and environment.
Broadbent will make every effort to advise REH Marketing, Inc. of matters which should be reported to
government regulatory agencies. However, REH Marketing, Inc. is solely responsible for reporting such
matters, and Broadbent shall not be held liable in the event that the proper agency is not notified. Our
services will be performed in accordance with generally accepted practice at the time work commences.
Results and recommendations will be based on review of available documentation and written or verbal
correspondence with appropriate regulatory agencies, laboratory results, observations of field personnel,
and the points investigated. No warranty is expressed or implied.

FIGURES
HILLCREST
INVESTMENT CO.
MW-21
STORM
DRAIN
MW-22
MW-14
MW-18
LIGHT
DUMPSTER
MW-12
GAS LINE
MW-15
ITALIAN VILLAGE
RESTUARANT
GAS LINEIVP-1
SV
MW-9
LANDSCAPE
MW-6
MW-8
OVERHEAD POWER LINE
STORM
DRAIN MW-20
MW-17
PARKING LOT MW-1
GP-1
MW-10
SVMW-2
A1-1
EW-3
MW-19
FIBER OPTIC LINE
5400 SOUTH STREET
MW-13
MW-3
EW-1 GP-2
EW-2
CANOPY
UL UL UL MW-5
MW-4
ELECTRICAL
SIDEWALK FIBER OPTIC LINE
SW-1
UST BASIN
MW-7
C-STORE DISPENSER
B-1
WATER LINE
ELECTRICAL
MW-11 ENCLOSURE B-2
STORM DRAIN AC
DU
M
P
S
T
E
R
S
CO
N
C
R
E
T
E

P
A
D
SI
D
E
W
A
L
K
90
0

E
A
S
T

S
T
R
E
E
T
OVERHEAD POWER

L
I
N
E
WATE
R

L
I
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E
O
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R
H
E
A
D

P
O
W
E
R

L
I
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E
PMW-23
PMW-24 PMW-25
MW-16
PMW-26
Site Map with Proposed Monitoring Well Locations
Basin Market Sinclair 105
5380 South 900 East
Murray, Utah
Project No. 23-14-106
Figure
Prepared by: JEH Reviewed by: ACM Date: 8/129/24
1
0
SCALE: 1 inch = 40 feet
40 80
LEGEND
Property Boundary (Approximate)
Proposed Monitoring Well LocationPMW-23
Existing Monitoring Well LocationMW-1
Site Features and Existing Monitoring Well
Locations provided by Hamilton Environmental
Historical Geoprobe LocationEW-1

APPENDICES

Appendix A
Cost Estimate

Title Number Unit Rate %Markup Amount
Site Investigation/GWM Work Plan 1 Unit $1,100.00 $1,100.00
Site Access Update 1 Unit $100.00 $100.00
Task 1 Subtotal:$1,200.00
Title Number Unit Rate %Markup Amount
P101 Sr. Project Manager 2 Hr $152.00 $304.00
P103 Project Manager 6 Hr $118.00 $708.00
P104 Field Scientist 25 Hr $101.00 $2,525.00
P109 Administrative Assistant 0 Hr $62.00 $0.00
Outside Expenses
Drilling Contractor (Direct Push Services + Utility Locate)1 Invoice $9,415.00 $9,415.00
Field Equipment - PID 1 Day $95.00 $95.00
Bailers (weighted)4 Ea $11.00 $44.00
Sampling Supplies 2 Days $25.00 $50.00
Oil/Water Interfrace Probe 1 Day $40.00 $40.00
Traffic Safety Equipment 1 Day $15.00 $15.00
Mileage 30 Miles $0.66 $19.65
Waste Disposal 1 Drum $250.00 $250.00
Laboratory - Soil, 8015/8260 (TPH D-G/BTEXN/MTBE)9 samples $85.00 $765.00
$14,230.65
Task 3: Monitoring Well Development Coordination/Oversight and Wellhead Surveying (MW-23 through MW-26)
Title Number Unit Rate %Markup Amount
P101 Sr. Project Manager 1 Hr $152.00 $152.00
P103 Project Manager 0 Hr $118.00 $0.00
P104 Field Scientist 5 Hr $101.00 $505.00
P107 Drafter 0 Hr $85.00 $0.00
P108 PST Trust Fund Claim Specialist 0 Hr $78.00 $0.00
P109 Administrative Assistant 0 Hr $62.00 $0.00
Outside Expenses
Drilling/Development Contractor (Direct Push Services)1 Invoice $1,000.00 $1,000.00
Field Supplies 1 Day $25.00 $25.00
Waste Disposal (Sediment laden water)1 Drum $250.00 $250.00
Traffic Safety Equipment 1 Day $15.00 $15.00
Mileage 15 Miles $0.66 $9.83
$1,956.83Task 3 Subtotal:
5380 South 900 East,Murray, Salt Lake County, Utah
Utah Release Site: MRR
Table 1: Additional Site Investigation and Groundwater Monitoring/Sampling Event
Basin Markets #105 (former Sinclair)
Task 1: Additional Site Investigation and GWM Event Work Plan and Property Access
Task 2: Site Investigation/Well Installation (subcontractor scheduling, site visit for well inspection/marking, utility locating, SI/Well
Installation, well vault replacement x3)
Task 2 Subtotal:
(Installation of Additional Monitoring Wells MW-23 through MW-26)
5380 South 900 East,Murray, Salt Lake County, Utah
Utah Release Site: MRR
Table 1: Additional Site Investigation and Groundwater Monitoring/Sampling Event
Basin Markets #105 (former Sinclair)

(Installation of Additional Monitoring Wells MW-23 through MW-26)
Task 4: Groundwater Monitoring/Sampling Event (31 Monitoring Wells)
Title Number Unit Rate %Markup Amount
P101 Sr. Project Manager 1 Hr $152.00 $152.00
P103 Project Manager 2 Hr $118.00 $236.00
P104 Field Scientist 33 Hr $101.00 $3,333.00
P107 Drafter 0 Hr $85.00 $0.00
P108 PST Trust Fund Claim Specialist 0 Hr $78.00 $0.00
P109 Administrative Assistant 0 Hr $62.00 $0.00
Outside Expenses
Bailers (weighted)31 Ea $11.00 $341.00
Sampling Supplies 1 Week $75.00 $75.00
Water Level Meter 1 Week $75.00 $75.00
Water Quality Meter 1 Week $120.00 $120.00
Peristaltic Pump 1 Week $90.00 $90.00
Traffic Safety Equipment 1 Week $60.00 $60.00
Tubing 475 Feet $0.50 $237.50
Mileage 45 Miles $0.66 $29.48
Laboratory - Water, 8015/8260 (TPH D-G/BTEXN/MTBE)31 samples $85.00 $2,635.00
Waste Disposal (assume thin spread)0 Drums $250.00 $0.00
$7,383.98
Task 5: Site Investigation (Well Installation) & GWM Report Preparation
Title Number Unit Rate %Markup Amount
P100 Principal 1 Hr $169.00 $169.00
P101 Sr. Project Manager 4 Hr $152.00 $608.00
P102 Professional Engineer/Geologist 5 Hr $147.00 $735.00
P103 Project Manager 28 Hr $118.00 $3,304.00
P104 Field Scientist 18 Hr $101.00 $1,818.00
P107 Drafter 8 Hr $85.00 $680.00
P108 PST Trust Fund Claim Specialist 4 Hr $78.00 $312.00
P109 Administrative Assistant 2 Hr $62.00 $124.00
$7,750.00
Total Anticipated Project Fees :$32,521.45
Task 3 Subtotal:
Task 5 Subtotal: