DERR-2024-011257

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Arcadis U.S., Inc.
630 Plaza Drive
Suite 200
Highlands Ranch
Colorado 80129
Tel [phone]
Fax [phone]
www.arcadis.com
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Ms. Liberty Coe
Utah Department of Environmental Quality
Division of Environmental Response and Remediation
195 North 1950 West
Salt Lake City, UT 84114-4840
Subject:
Additional Subsurface Investigation and Groundwater Monitoring Well
Installation Work Plan
CEMC Site No. 377352
1917 West 1700 South, Salt Lake City, Utah
DERR Facility Identification 4002428, Release Site MKS

Dear Ms. Coe:
On behalf of Chevron Environmental Management Company (CEMC), Arcadis
U.S., Inc. (Arcadis) has prepared this Additional Subsurface Investigation and
Groundwater Monitoring Well Installation Work Plan (workplan) for CEMC Site No.
377352, located at 1917 West 1700 South in Salt Lake City, Utah (the Site;
Figure 1). On April 16, 2024, the Utah Division of Environmental Response and
Remediation (DERR) received the Additional Subsurface Investigation and
Groundwater Monitoring Well Installation Report. On May 2, 2024, the DERR
responded requesting further investigation to determine the full extent of
subsurface contamination. Specifically, the extent of contamination has not been
defined to the west of the plume as free product was observed in MW-1, MW-2,
MW-9, MW-10, and MW-12. Prior to completing additional investigation activities,
Arcadis proposed a groundwater monitoring event to observe if site conditions
had changed. This additional monitoring event was approved by the DERR in an
email dated May 21, 2024, where it was agreed that a new due date for the report
associated with the additional investigation activities would be established after
the submittal of the Groundwater Monitoring Report.
The groundwater event was completed on July 10, 2024 and revealed that free
product (i.e., light non-aqueous phase liquid [LNAPL]), mobilized into wells that
previously did not contain LNAPL (MW-11 and MW-14). A Groundwater
Monitoring Report summarizing these activities was submitted to DERR on
September 20, 2024. This workplan details the installation of four proposed
monitoring wells to support delineation of LNAPL to the north and west of the
existing LNAPL plume.
ENVIRONMENT

Date:
September 26, 2024

Contact:
Jason Cristino

Phone:
312 229-5473

Email:
[e-mail]

Our ref:
30064298

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Utah DERR
September 26, 2024

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SITE DESCRIPTION AND BACKGROUND
The Site is located at 1917 West 1700 South, Salt Lake City, Utah, in an industrial area of the city (Figure
1). Some portions of the former Site are currently located in the public Right-of-Way (ROW) of 1700 South
Street; the remaining portions of the Site are now on private property currently owned by Church of Jesus
Christ Latter-Day Saints (LDS). The private property south of the former UST area currently operates as a
Printing and Distribution Center, while the property north of the former UST area currently operates as a
Thrift Store and Donation Center.
According to lease records, the Site was developed as a gas station and service shop prior to
approximately 1955. Per the historic lease information from 1957, inventory present at the Site included
two 15,000-gallon USTs and one 30,000-gallon AST. In addition, dispensers and USTs may have been
located to the north of the former site building. Site features of note include railroad tracks that extended
to the former site building. It is unclear if the rail cars were able to pull into the building or if they
terminated at the building. Per the 1981 aerial photograph, the site features appear to have been
removed concurrent with the widening of 1700 South and the gas station activities reportedly ended prior
to 1981.
In 2008, Questar Gas excavated test pits in conjunction with planned utility work in the vicinity of the Site.
Questar collected soil samples and test results indicated a potential petroleum hydrocarbon release which
sparked the subsurface investigation by AECOM Technical Services (AECOM) in 2019, as requested by
Utah DERR. In 2019, AECOM advanced three boreholes to total depths approximately 15 feet below
ground surface (bgs). The soil and groundwater results from this Site investigation indicated the presence
of petroleum hydrocarbons in soil and groundwater which exceeded Utah DERR’s leaking UST (LUST)
initial screening levels (ISLs) for both total petroleum hydrocarbons (TPH) as gasoline range organics
(GRO) and diesel range organics (DRO) (AECOM 2019).
In November 2020, Arcadis installed four monitoring wells in the right-of-way of 1700 South and collected
soil samples. Several soil sample results were identified with petroleum hydrocarbon impacts exceeding
the Utah LUST ISLs. LNAPL was observed in MW-1 during the December 2020 groundwater sampling
event (Arcadis 2021a).
In March 2021, Arcadis conducted a groundwater monitoring event and removed free product.
Measurable LNAPL was detected in MW-1. Free product removal was conducted by bailing out the
LNAPL. A total of 2.11 gallons of LNAPL and groundwater mixture was evacuated from well MW-1. An
absorbent sock was installed at well MW-1 during the March 2021 event to continue recovery of LNAPL
from the well (Arcadis 2021c).
In September 2021 a groundwater gauging and free product removal event was conducted. Measurable
LNAPL, observed in MW-1, was removed via bailing. Approximately 6 gallons of LNAPL and groundwater
mixture was removed from well MW-1. A two-stage absorbent sock assembly was deployed in MW-1
during the event to continue recovery of LNAPL.
In October 2023, Arcadis oversaw the installation of ten monitoring wells (MW-5 through MW-14). Wells
were installed on-site, within the right-of-way of 1700 South, and on the property to the north located at
1663 Wallace Road (Figure 2). Soil samples collected during well installation activities contained
detectable concentrations of TPH-GRO, TPH-DRO, oil and grease above the ISLs. On October 30
through November 3, 2023, Arcadis conducted groundwater sampling at the Site. LNAPL was observed

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Utah DERR
September 26, 2024

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in monitoring wells MW-1, MW-2, MW-9, MW-10, and MW-12. LNAPL was removed from the wells and
dissolved phase groundwater concentrations were evaluated at each of these locations. TPH-DRO (with
and without SGT), TPH-GRO, and benzene (MW-2 only) were detected above their respective ISL. For
wells that did not contain LNAPL, concentrations exceeding their respective ISLs were limited to TPH-
GRO (MW-4 and MW-5) and TPH-DRO (MW-8 and MW-11).
In July 2024 Arcadis conducted additional groundwater sampling and LNAPL bailing activities. Fourteen
monitoring wells, MW-1 through MW-14 (Figure 2) were gauged, and seven monitoring wells were
sampled. LNAPL was observed and subsequently removed in seven of the site monitoring wells including
MW-1, MW-2, MW-9 through MW-12, and MW-14. Groundwater samples collected from wells without
LNAPL exhibited detectable concentrations just above the ISL’s for TPH-DRO (MW-8) and TPH-GRO
(MW-4 and MW-5).
Geology and Hydrogeology
The Site lies in the Salt Lake Valley which is bordered by the Basin and Range Physiographic province to
the east. Site topography is relatively flat. Geologic information gathered during site investigations
indicate the geology at the Site consists predominately of clay, with interbedded layers of silty clay, sandy
clay, or sand. Depth to groundwater measurements were collected on July 8, 2024 and ranged from 4.61
feet below top of casing (btoc) (MW-6) to 9.09 btoc (MW-12), with groundwater elevations ranging from
4226.28 (MW-12) to 4227.66 (MW-4). The 2021 groundwater sampling event interpreted a northwest flow
with a gradient of 0.0069 feet per foot. Note that the groundwater elevation at wells with observed
LNAPL, MW-1, MW-2, MW-9, MW-10, MW-11, MW-12 and MW-14 is calculated assuming a specific
gravity of 0.75.
PROPOSED SCOPE OF WORK
Initial tasks include the preparation of a health and safety plan (HASP), laboratory coordination, conducting an
internal readiness review, subsurface hazard avoidance and utility clearance screening. A Site meeting with
the property owner during the utility marking to establish the exploration locations and oversight of the drilling
subcontractor may also be held. Both drilling and encroachment permits will be obtained, as required, prior to
implementing the investigation activities.
Arcadis proposes the installation of groundwater monitoring wells at four locations to a depth of 20 feet bgs as
shown on Figure 2.
 One downgradient monitoring well is proposed to the north of MW-13 and MW-14 on the property
located at 1663 Wallace Road.
 Two side gradient monitoring wells are proposed to the west of MW-10, MW-12, and MW-13 on the
property located at 1665 Bennett Road.
 One side gradient monitoring well is proposed west of the former AST area and west of MW-8 and
MW-9 on the south side of 1700 South.
The location and rationale for each monitoring well location is provided in Table 1.
Wells will be installed, developed, and sampled by a Utah Licensed driller in accordance with the State of
Utah Water Well Handbook (Utah Division of Water Rights [DWR] 2018) and the Utah Groundwater and

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Utah DERR
September 26, 2024

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Soil Sampling Study Guide (Utah Department of Environmental Quality [UDEQ] 2013). The well locations
will be advanced using continuous core sonic drilling techniques past the groundwater table, which is
anticipated to be at approximately 5 to 8 feet bgs and to a maximum depth of 20 feet bgs. The final well
depths may be adjusted based on field observations. Based on the anticipated total depth for each well
(which is less than 30 feet bgs), a drilling permit is not required.
Soil Sampling
Soils will be logged for lithologic properties including soil type, color, and moisture content in accordance
with the Unified Soil Classification System (American Society for Testing and Materials D2488). In
addition, observations will be noted regarding observed staining and relative volatile organic compound
(VOC) concentrations as measured with a photoionization detector (PID). Retrieved soils will be logged
by experienced field personnel, under a Utah UST soil and groundwater certified sampler. Soil samples
will be collected for analytical testing from zones with elevated PID readings and/or the capillary fringe. In
addition, a soil sample will be collected from the bottom of the boring to confirm vertical delineation.
Additional soil samples may be collected as necessary based on field observations. Laboratory analysis
and sampling handling procedures are described in the following section.
Well Construction and Groundwater Sampling
The groundwater monitoring wells will be constructed using 2-inch outer diameter (OD) schedule 40
polyvinyl chloride (PVC) casing with approximately 15 feet of 0.010-inch slotted screen. A filter pack
consisting of #10/20 sand will extend from the bottom of the boring to approximately two feet above the
screen interval. A minimum of a two-foot thick hydrated bentonite seal will be placed above the filter pack.
Neat cement will be placed above the bentonite seal to the surface. The wellhead will be sealed with a
locking cap and contained within a flush mounted, traffic-rated, watertight well box. The total well
completion depth and screen interval will be determined based on observations in the field. Each
monitoring well location will be surveyed using a licensed land surveyor.
The newly installed monitoring wells will be developed, a minimum of, 24 hours following installation. The
well development will use a combination of surging, bailing, and pumping. A surge block will be moved up
and down across the screened interval to remove fine-grained sediments. After the well is surged, a bailer
will be used to remove sediment and turbid water. The final development task will consist of pumping the
well at a steady flow rate while monitoring groundwater parameters (including temperature, pH,
conductivity, turbidity, dissolved oxygen, and oxygen reduction potential) using a water quality meter.
Analytical groundwater sample collection will occur after well development. Groundwater sample
collection will follow United States Environmental Protection Agency (USEPA) Standard Operating
Procedure (SOP) for Low-Stress (Low Flow)/Minimal Drawdown Groundwater Sample Collection (USEPA
2015) and the Utah Petroleum Storge Tank Environmental Media Sampling Handbook April, 1, 2024
(UDEQ 2024).
Laboratory Analyses
Soil and groundwater samples collected for laboratory analytical testing will be completed by a Utah
Environmental Laboratory Certification Program (ELCP)-certified laboratory. Samples will be analyzed for
the following:
 TPH-GRO by United States Environmental Protection Agency (USEPA) Method 8260B;

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Utah DERR
September 26, 2024

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 TPH-DRO and TPH-ORO by USEPA Method 8015;
 Oil and grease by USEPA Method 9071B (solid) and 1664A (water);
 Benzene, toluene, ethylbenzene, total xylenes (BTEX, collectively) and Naphthalene (N), 1,2-
dichloroethane (1,2-DCA or EDC), 1,2-dibromoethane (1,2-DBA or EDB) and methyl-tert butyl ether
(MTBE) by USEPA Method 8260B; and
 Total organic carbon (TOC) by Method USEPA 9060.
Furthermore, Arcadis plans to collect additional soil and groundwater samples from select intervals for
TPH fractionation analysis (by Methods 8260D and 8270E). One soil sample will be collected and
analyzed for TPH fractionation from a location with the highest PID Reading. One water sample from the
well exhibiting the highest TPH-GRO/DRO/ORO concentration in groundwater will be analyzed for TPH
Fractionation.
Soil samples for laboratory analysis of TPH-GRO (by Method 8015B), BTEXN/MTBE (by Method 8260B),
and TPH fractionation (by Methods 8260D and 8270E) will be collected using Terracore or Encore™
sampling devices. Soil samples for laboratory analysis of TPH-DRO and TPH-ORO (by Method 8015) and
oil and grease (by Method 9071B) will be submitted using laboratory-provided glass jars. Groundwater
samples for laboratory analysis will be collected in laboratory-provided containers (i.e., VOA vials with HCl
and glass containers). Groundwater and soil samples will be stored on ice in coolers and transported to
the ELCP-certified laboratory under proper chain-of-custody procedures. Arcadis plans to submit the soil
and groundwater samples to Pace Analytical, except for TPH fractionation, which will be submitted to
Chemtech-Ford Laboratories in Sandy, Utah.
Decontamination Methods and Waste Handling
Downhole drilling and sampling equipment will be decontaminated following the completion of each
boring. Downhole equipment will be washed in an Alconox® solution and rinsed with distilled between
samples. Any reusable sampling equipment (i.e., downhole pump for well development) will also be
decontaminated between locations.
Investigation-derived waste generated during drilling operations will be containerized in United States
Department of Transportation-approved 55-gallon drums and temporarily stored at a pre-determined location
pending characterization. Arcadis will manage the waste profile and arrange for a certified waste contractor to
transport and dispose of the waste. Waste removal documentation will be presented within the additional
subsurface investigation and monitoring well completion report.
DATA EVALUATION AND REPORTING
At the conclusion of subsurface investigation activities, Arcadis will evaluate field and analytical data to
produce an additional subsurface investigation and well installation completion report for electronic
submittal to DERR. The report will include an introduction, site description and maps, Tier 1 criteria,
nature of the release and abatement measures, methodology (e.g., sampling activities summaries,
analytical results, supporting field documentation, etc.), results, conclusions and recommendations as
required in the Leaking Underground Storage Tank (LUST) Subsurface Investigation Report Guide
(DERR 2014).

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Utah DERR
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Moving forward, once delineation is considered complete, Arcadis proposes to monitor the well network
quarterly for approximately 4 quarters to assess seasonality, establish COC concentration trends, and
verify groundwater flow direction and plume geometry. Arcadis plans to discuss with Utah DERR the
appropriate number of monitoring wells and COC analytes to incorporate into this routine monitoring
effort.

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Utah DERR
September 26, 2024

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PROJECT SCHEDULE AND CLOSING
Work will begin upon receipt of written workplan approval from DERR and acquisition of property access
for the proposed monitoring well locations. A completion report will be submitted to DERR within 60 days
of receipt of the laboratory analytical data.
If you have any questions regarding the contents of this work plan, please contact Jason Cristino by
phone [phone]) or email ([e-mail]).
Sincerely,
Arcadis U.S., Inc.

Jason Cristino
Certified Project Manager

Taura Nichols, P.E.
UST Certified Consultant CC 0247
Copies:
John Amato, CEMC
Enclosures:
Figures
1 Site Location Map
2 Historical Sampling Locations and Proposed Monitoring Well Locations
Table
1 Proposed Monitoring Well Location Rationale

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Utah DERR
September 26, 2024

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REFERENCES
AECOM. 2019. Corner Service Subsurface Investigation Report, 1917 West 1700 South, Salt Lake City,
Utah, Facility ID #4002428, Release ID MKS, Work Assignment MKS-2-AEC, December 16.
Arcadis. 2021. Subsurface Investigation Report. Chevron Site No. 377352, 1917 West 1700 South, Salt
Lake City, Utah. February 5.
DERR. 2014. Leaking Underground Storage Tank (LUST) Subsurface Investigation Guide. May.
UDEQ. 2013. Utah Groundwater and Soil Sampling Study Guide. June.
UDEQ. 2024. Utah Petroleum Storage Tank Environmental media Sampling Handbook. April 1.
Utah DWR. 2018. State of Utah Well Water Well Handbook. May.
USEPA. 2015. Standard Operating Procedure for Low-Stress (Low Flow)/ Minimal Drawdown
Groundwater Sample Collection. June 17.

FIGURES
REFERENCE:BASE MAP USGS 7.5. MIN. TOPO. QUAD., SALT LAKE CITY SOUTH AND SALT LAKE CITY NORTH, UTAH, 2020
APPROXIMATE SCALE : 1 in. = 2,000 ft.
0 2,000'4,000'
N
SITE LOCATION MAP
CHEVRON SITE NO. 377352
1917 WEST 1700 SOUTH
SALT LAKE CITY, UTAH
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15153010120000 FORMER CHEVRON SITE NO. 377352
1917 WEST 1700 SOUTH
SALT LAKE CITY, UTAH
60'120'
APPROXIMATE SCALE : 1 in. = 60 ft.
SITE PLAN
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NOTE:
THIS DRAWING IS REFERENCED FROM THE FOLLOWING:
A.“FIGURE 2, SITE PLAN” , BY AECOM
DATED: DECEMBER 2019, SCALE: 1’’=100’
FIGURE
2
GROUNDWATER MONITORING WELL
FORMER DIRECT-PUSH BORING
LOCATION
FORMER ABOVEGROUND STORAGE TANK
FORMER CORNER SERVICE GAS STATION
BUILDING
FORMER UNDERGROUND STORAGE
TANKS/DISPENSER
APPROXIMATE LOCATION OF QUESTAR
GAS TEST PIT (8'W x 10'L x 6'D)
FORMER SECONDARY CONTAINMENT
AERIAL SOURCE:
©2023 MICROSOFT CORPORATION © 2022 MAXAR
©CNES (2022)
PROPOSED WELL LOCATION
PARCEL BOUNDARY
PARCEL ID15151520180000
1665 BENNETT ROAD
1663 WALLACE ROAD
1680 INDUSTRIAL ROAD
1999 W 1700 S
1918 W 1700 S
TABLE
MW-15
MW-16
MW-17
MW-18
Note
Monitoring Well ID may change based on field execution
This well is proposed on the property located at 1999 W. 1700 South to support dissolved phase impacts and LNAPL delineation efforts west of MW-8 and MW-9.
The well is proposed on the property at 1663 Wallace Road to support LNAPL delineation efforts to the north of MW-14.
This well is proposed on the property located at 1665 Bennett Road to support LNAPL delineation efforts west of MW-10.
This well is proposed on the property located at 1665 Bennett Road to support LNAPL delineation efforts west of MW-13.
TABLE 1
PROPOSED MONITORING WELL LOCATION RATIONALE
Chevron #377352
1917 West 1700 South, Salt Lake City, Utah
Installation RationaleMonitoring Well ID
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