DERR-2024-004767

WASATCH ENVIRONMENTAL, INC.
ENVIRONMENTAL SCIENCE AND ENGINEERING

2410 WEST CALIFORNIA AVENUE
SALT LAKE CITY, UTAH 84104
PHONE [phone]
FAX [phone]
e-mail: [e-mail]
www.wasatch-environmental.com

CORRECTIVE ACTION PLAN
FORMER SMITHS GAS AND VIDEO
905 WEST NORTH TEMPLE
SALT LAKE CITY, UTAH
FACILITY ID: 4000251
RELEASE SITE: IUQ

Project No. 1171-008I

Prepared for:

Ms. Avery Holyoak
Utah Department of Environmental Quality
Division of Environmental Response and Remediation
Leaking Underground Storage Tank Branch
P.O. Box 144840
Salt Lake City, UT 84114-4840

July 12, 2023

Prepared by:

Wasatch Environmental, Inc.
2410 West California Avenue
Salt Lake City, UT 84104

________________________________________
Blake B. Downey, P.G.
Senior Project Hydrogeologist

Corrective Action Plan Former Smiths Gas and Video
Wasatch Environmental, Inc. i

TABLE OF CONTENTS
Section Page No.
1. INTRODUCTION .............................................................................................................................. 1
1.1 Site Description ................................................................................................................... 1
1.2 Site Background .................................................................................................................. 1
1.3 Objective ............................................................................................................................. 2
1.4 Project Milestones ............................................................................................................... 2
2. CORRECTIVE ACTION COMPARISON AND SELECTION ........................................................... 2
2.1 Site Characteristics ............................................................................................................. 2
2.2 Land Use ............................................................................................................................. 3
2.3 Proposed Cleanup Levels ................................................................................................... 3
2.4 Proposed Corrective Action Measures ............................................................................... 3
2.5 Proposed Contingency Measures ....................................................................................... 3
2.5.1 Notification to Blue Stakes of Utah Utility Notification Center ................................ 3
2.5.2 Environmental Covenant and Site Management Plan ............................................ 3
2.5.3 Sample Fractionation to Determine Potential Risks ............................................... 4
3. CORRECTIVE ACTION DESIGN AND CONSTRUCTION ............................................................. 4
3.1 Excavation and Stockpiling of Non-Impacted Soil .............................................................. 4
3.2 Excavation and Off-Site Disposal of Impacted Soil ............................................................ 4
3.3 Extraction, Treatment, and Disposal of Impacted Groundwater ......................................... 4
3.4 Installation of Vapor Barriers ............................................................................................... 5
4. PERMITTING REQUIREMENTS ..................................................................................................... 5
4.1 Blue Stakes Utility Clearance Request ............................................................................... 5
4.2 Salt Lake City Development Permit .................................................................................... 5
4.3 Salt Lake County Health Department ................................................................................. 5
4.4 Utah Pollutant Discharge Elimination System (UPDES) - Groundwater Discharge Permit 5
5. PUBLIC NOTIFICATION .................................................................................................................. 5
6. SAMPLING AND ANALYSIS ........................................................................................................... 5
6.1 Waste Characterization Sampling ....................................................................................... 5
6.2 Excavation Confirmation Soil Sampling .............................................................................. 6
6.3 Excavation Confirmation Groundwater Sampling ............................................................... 6
7. CORRECTIVE ACTION IMPLEMENTATION REPORT .................................................................. 6
8. HEALTH AND SAFETY ................................................................................................................... 7

FIGURES
Figure 1 – Site Location Map
Figure 2 – Site Feature Map
Figure 3 – Selected Historical Sample Location Map
Figure 4 – Proposed Excavation Map

APPENDICES
Appendix A – Historical Data Tables and Selected Isoconcentration Maps
Appendix B – Proposed Cleanup Levels
Appendix C – Vapor Barrier Specifications and Installation Instructions
Appendix D – Example Public Notification
Corrective Action Plan Former Smiths Gas and Video
Wasatch Environmental, Inc. 1

CORRECTIVE ACTION PLAN
FORMER SMITHS GAS AND VIDEO
SALT LAKE CITY, UTAH

1. INTRODUCTION

On behalf of J Fisher Companies, (Client) the prospective purchaser of the former Smiths Gas and Video
property (Site), Wasatch Environmental, Inc., (Wasatch) has prepared this Corrective Action Plan (CAP)
for addressing residual petroleum hydrocarbon impacts to soil and groundwater that have been identified
at the Site.

1.1 Site Description

The Site is located at 905 West North Temple Street in Salt Lake City, Utah, on the southwest corner of
the intersection of North Temple and 900 West (as depicted on Figures 1 and 2). The Site consists of
one parcel (Parcel Number 08-35-456-045) occupying 0.15 acres. The Site is developed with one slab-
on-grade, single-story, 1,180-square-foot, commercial structure constructed in 1969. The Site is currently
occupied by Salt City Auto, a used car dealership.

The Site is a former Leaking Underground Storage Tank (LUST) site identified as Facility ID 4000251 and
Release Site IUQ. Additional details are provided in Section 1.2 of this CAP.

1.2 Site Background

Our research indicates the Site was residential from at least 1891 to 1947, when it was converted to a
gasoline/service station. The Site was occupied by two gasoline/service stations until at least 1985. The
Site was occupied by Smith’s Gas and Video in at least 1991. Since 2003, the Site has been occupied by
several used car dealerships.

The Site was identified as a former underground storage tank (UST) and LUST site. Regulatory agency
information documents that one 250-gallon used oil UST was removed from the Site in 1974; one 8,000-
gallon gasoline UST, one 6,000-gallon gasoline UST, and one 4,000-gallon diesel fuel UST were
removed from the Site in 1997; and two 4,000-gallon USTs with unknown contents were removed from
the Site in 2018.

A release (IUQ) was reported for the Site on January 3, 1995. The majority of the Site investigations
have been completed under the oversight of the LUST Trust program. Several monitoring wells have
been installed on the Site, and numerous soil borings have been completed that facilitated the collection
and analysis of soil and groundwater samples from the Site. Since 1995, numerous subsurface
investigations and groundwater monitoring activities associated with the former USTs have been
conducted. Additionally, enhanced fluid recovery activities were conducted at the Site in 1997 and 1998
which resulted in the extraction of over 9,600 gallons of petroleum-impacted water. Petroleum
hydrocarbon impacts have historically been identified at the Site at concentrations exceeding both the
applicable Utah Initial Screening Levels (ISLs) and Utah Risk-based Corrective Action (RBCA) Tier I
Screening Levels. Groundwater monitoring activities are on-going.

A microbial and nutrient injection pilot study was conducted by Atlas Technical Consultants, LLC (Atlas).
Details are documented in the BOSS0200 Microbial and Nutrient Injection Pilot Study and Groundwater
Monitoring Report dated October 7, 2022. The pilot study was completed on the northwestern portion of
the Site to evaluate if this injection amendment would be a viable remediation technique for the Site.
While petroleum hydrocarbon concentration reduction was observed within the pilot study area, the
reduced concentrations did not meet applicable Utah ISLs. Additionally, residual free product was
observed in monitoring well MW-1R after the injection activities. See Figure 3 for a historical sampling
location map. See Appendix A for historical soil and groundwater data tables and select isoconcentration
maps.
Corrective Action Plan Former Smiths Gas and Video
Wasatch Environmental, Inc. 2

Regulatory closure for this release on the Site has not been granted by the Utah Department of
Environmental Quality (UDEQ). The Site groundwater plume and soil impacts pose an environmental risk
to receptors at the Site and there is a possible vapor migration and vapor intrusion risk from the
petroleum hydrocarbon contamination. Groundwater appears to be located approximately 10 feet below
ground surface (bgs).

Additionally, several petroleum hydrocarbon releases have been documented on the adjoining northeast
and eastern properties. These off-Site releases do not appear to have impacted the Site.

J Fisher Companies has requested that Wasatch complete a CAP that would allow the redevelopment
and potential residential use of the Site.

1.3 Objective

The Client plans to redevelop the Site for residential use; therefore, the objective of this corrective action
is to remediate soil and groundwater at the Site to meet the Utah ISLs and achieve regulatory closure of
the release site with unrestricted land use. If the Site does not meet Utah ISLs following the completion
of this corrective action, the Client may choose to implement engineering controls (e.g., vapor barriers)
and institutional controls (e.g., an environmental covenant) to facilitate redevelopment of the Site for
residential use.

1.4 Project Milestones

The following are the major milestones for the corrective action:

• Public notification posted, public comment period commences – July 25, 2023.
• Public comment period closes - August 25, 2023.
• Final approval of the CAP by the Utah DERR - August 26, 2023.
• Nearby buildings demolished to facilitate the CAP activities – December 20, 2023.
• Collection of waste characterization soil samples – January 15, 2024.
• Blue Stake utility clearance and all permitting completed - March 5, 2024.
• Commencement of corrective action field work – March 15, 2024.
• Corrective action field work completed – April 30, 2024.
• Corrective action implementation report submitted to Utah DERR – May 30, 2024.
• Formal regulatory closure granted by Utah DERR - June 30, 2024.

2. CORRECTIVE ACTION COMPARISON AND SELECTION

2.1 Site Characteristics

Soil at the Site generally consists of gravelly/sandy fill underlain by clays and silty clays with some sand
lenses. In general, there is approximately 8 feet of clean overburden at the Site. However, shallow soil
impacts are present near monitoring well MW-1R. The most significant residual petroleum hydrocarbon
contamination in soil is present at depths of 8 to 16 feet below ground surface (bgs) with some areas
extending down to 20 feet bgs. Petroleum hydrocarbon impacts to soil at concentrations that exceed the
Utah ISLs are located on the central, northwestern, and western portions of the Site.

Depth to groundwater is approximately 10 feet bgs with a hydraulic gradient that has ranged from north
(historically) to west (most recent). Based on the Groundwater Monitoring Report dated August 24, 2020,
completed by ATC the last measured groundwater flow directions was to the West with a hydraulic
gradient of 0.004 feet/foot. Petroleum hydrocarbon impacts to soil at concentrations that exceed the Utah
ISLs are located on the central, northwestern, and western portions of the Site. Petroleum hydrocarbon
impacts to groundwater at concentrations that exceed the Utah ISLs are located on the central,
northwestern, and western portions of the Site.
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Wasatch Environmental, Inc. 3

2.2 Land Use

Our research indicates the Site was residential from at least 1891 to 1947, when it was converted to a
gasoline/service station. The Site was occupied by two gasoline/service stations until at least 1985. The
Site was occupied by Smith’s Gas and Video in at least 1991. Since 2003, the Site has been occupied by
several used car dealerships.

The surrounding land use has historically been a mixed use of residential and commercial properties.
Additionally, several petroleum hydrocarbon releases have been documented on the adjoining northeast
and eastern properties. These off-Site releases do not appear to have impacted the Site.

2.3 Proposed Cleanup Levels

Given that the proposed land use following completion of the corrective action is residential, the proposed
cleanup levels for this corrective action will be Utah ISLs for both soil and groundwater. The proposed
cleanup levels are presented in Appendix B.

2.4 Proposed Corrective Action Measures

Given the Site characteristics, nature and distribution of contaminants, and proposed future land use;
Wasatch proposes excavation and off-Site disposal of petroleum-contaminated soil exhibiting petroleum
hydrocarbon concentrations above the Utah ISLs. Wasatch also proposes the extraction, on-Site
treatment, and disposal of petroleum-contaminated groundwater from the Site. Groundwater may be
extracted from existing monitoring wells and from open excavations where the excavations extend below
the water table. Finally, because the Site is located in an urban area with a higher potential for
groundwater impacts originating from unknown off-Site sources, Wasatch may recommend that vapor
barriers be installed under all of the new residential structures at the Site. Details regarding these
corrective action measures are provided in Section 3 of this CAP.

2.5 Proposed Contingency Measures

The following contingency measures are proposed in the event that the corrective action fails to fully
achieve the proposed cleanup levels. Prior to implementation of the contingency measures, the details
regarding the implementation of these contingency measures would be presented to the DERR in an
addendum to the CAP and would be subject to DERR review and approval.

2.5.1 Notification to Blue Stakes of Utah Utility Notification Center

If soil and/or groundwater contamination originating from the Site, and at concentrations above
the Utah ISLs, remains in a utility corridor or under a roadway where it cannot be reasonably
remediated but is not posing a risk to anyone other than nominal risks to construction and utility
workers; notification could be provided to the Blue Stakes of Utah Utility Notification Center (Blue
Stakes). Blue Stakes, upon receipt of a utility clearance request in the affected area, would then
inform the person or entity making the utility clearance request of the residual contamination so
that appropriate measures could be taken to protect the workers. This would be protective of
construction and utility workers and could facilitate regulatory closure of the release site with
residual soil and/or groundwater contamination left in place a utility corridor or under a roadway.

2.5.2 Environmental Covenant and Site Management Plan

If residual contamination at concentrations above the Utah ISLs but below the Utah RBCA Tier 1
Screening Levels remains on-Site that for whatever reason could not be adequately addressed
during the corrective action, institutional controls (i.e., an environmental covenant and/or site
management plan, etc.) may be implemented to reduce the probability of exposure to the
contaminated soil and/or groundwater by restricting how the property may be used (e.g.,
forbidding the extraction and use of shallow groundwater). This would be protective of Site
Corrective Action Plan Former Smiths Gas and Video
Wasatch Environmental, Inc. 4

occupants and could facilitate regulatory closure of the release site with residual soil and/or
groundwater contamination left in place on-site.

2.5.3 Sample Fractionation to Determine Potential Risks

If residual petroleum contamination at concentrations above the Utah ISLs but below the Utah
RBCA Tier 1 Screening Levels remains on-Site, that for whatever reason could not be adequately
addressed during the corrective action, Wasatch would collect additional samples to be
fractionated to determine potential risks if left in place. If fractionation results indicate all risks are
acceptable, Wasatch would request a “No Further Action” letter be issued for the release.

3. CORRECTIVE ACTION DESIGN AND CONSTRUCTION

3.1 Excavation and Stockpiling of Non-Impacted Soil

Given that a majority of the soil above 8 feet bgs is likely clean overburden (except near monitoring well
MW-1R), it is likely that the excavation will require excavation and stockpiling of clean overburden.
Wasatch proposes that the non-impacted soil be excavated and stockpiled on-Site. The stockpiled soil
will be properly stored to prevent fugitive dust migrating off-Site. If required, visqueen will be placed and
secured over the soil stockpile. Excavation efforts of non-impacted soil would be guided by laboratory
analytical data, field screening with a photoionization detector (PID), and field observations of staining
and petroleum hydrocarbon odors to verify that impacted soil is not stockpiled with the non-impacted soil.
Wasatch would consider all soils exhibiting a PID reading of less than 10 parts per million (ppm) would be
segregated as non-impacted soil. Wasatch anticipates that non-impacted soil will be loaded directly into
transport trucks and stockpiled just south or west of the excavation or loaded directly adjacent to the
excavation at a safe distance away from the sidewalls. Wasatch will direct the non-impacted soil removal.
Areas where excavation is expected to be required are shown in Figure 4.

3.2 Excavation and Off-Site Disposal of Impacted Soil

Wasatch proposes excavating the soil contaminated with petroleum hydrocarbons at concentrations
above the Utah ISLs. Excavation efforts would be guided by laboratory analytical data, field screening
with a PID, and field observations of staining and petroleum hydrocarbon odors. Wasatch would oversee
the excavation contractor during the excavation and removal of impacted soils from the Site. Impacted
soils are planned for removal to meet Utah ISLs. Wasatch anticipates excavating to a maximum depth of
approximately 20 feet bgs with the majority of the excavation only extending to a depth of approximately
16 feet bgs. Impacted soil would be removed and transported off-Site for disposal at the E.T.
Technologies soil regeneration site. Wasatch typically recommends that the portions of the excavation
that extend below the water table be backfilled with clean 2-inch to 3-inch ballast rock, a geotextile filter
fabric be placed over the ballast rock, and that the remainder of the excavation be backfilled with the
clean overburden and clean, 2-inch minus, engineered fill and compacted in loose lifts not exceeding one
foot in thickness. In this case, however, Wasatch will defer to the Client and their excavation contractor to
determine the appropriate fill materials and compaction requirements that would be appropriate for the
proposed residential development. Wasatch estimates that approximately 1,400 tons of impacted soil will
be removed and disposed off-Site. Areas where excavation is expected to be required are shown in
Figure 4. Additionally, appropriate sidewall shoring techniques will be implemented where the excavation
nears the sidewalk areas.

3.3 Extraction, Treatment, and Disposal of Impacted Groundwater

Groundwater collecting in the excavation and groundwater extracted from on-Site monitoring wells (if
needed) will be pumped into a Baker tank, aerated to remove volatile organic compounds, and
discharged through a bag filter and granular activated carbon vessel to the storm sewer. Groundwater
discharge to the storm sewer will require a Utah Pollutant Discharge Elimination System (UPDES) permit
Corrective Action Plan Former Smiths Gas and Video
Wasatch Environmental, Inc. 5

and the water will be tested to verify that the discharged water meets the permitted discharge
requirements. Appropriate permits for discharge will be obtained prior to commencement of work.

3.4 Installation of Vapor Barriers

If cleanup levels or acceptable fractionation risk thresholds cannot be met, Wasatch would propose the
installation of vapor barriers consisting of 15-mil Stego® Wrap (or equivalent) beneath all of the new
residential structures constructed on the Site. The vapor barriers would be installed by a qualified
contractor. All seams, edges, and penetrations would be sealed in accordance with the manufacturer’s
recommendations. Specifications and installation instructions for the vapor barrier are provided in
Appendix C.

4. PERMITTING REQUIREMENTS

4.1 Blue Stakes Utility Clearance Request

A utility clearance request will be submitted to Blue Stakes at least two full business days prior to the
commencement of the excavation work. The Blue Stakes utility clearance will be renewed every 12
calendar days for the duration of the project.

4.2 Salt Lake City Development Permit

A Salt Lake City Development Permit will be obtained prior to the commencement of field work, if
required.

4.3 Salt Lake County Health Department

The Salt Lake County Health Department will be notified 72 hours prior to commencement of field work
related to the corrective action.

4.4 Utah Pollutant Discharge Elimination System (UPDES) - Groundwater Discharge Permit

A UPDES General Permit will be obtained from the Utah Division of Water Quality to facilitate the disposal
of impacted groundwater that has been treated on-Site related to the corrective action.

5. PUBLIC NOTIFICATION

Public notification will be completed, and any relevant comments addressed, prior to final DERR-approval
of the CAP. Public notification will be completed by hand-delivering flyers to businesses and residents
located within a 1/2-block radius of the Site. An example of the public notification is presented in
Appendix D. The dates and addresses where the flyers are delivered will be documented in field notes.
The public comment period is expected to begin on July 10, 2023, and end on August 10, 2023. A copy
of the CAP will be made available for review online at http://eqedocs.utah.gov, at the DERR office
building, and at the Salt Lake City Public Library.

6. SAMPLING AND ANALYSIS

6.1 Waste Characterization Sampling

Wasatch anticipates collecting one composite waste characterization sample from the Site to facilitate
proper soil disposal at E.T. Technologies.

Corrective Action Plan Former Smiths Gas and Video
Wasatch Environmental, Inc. 6

A composite sample will be collected using direct-push drilling techniques from within the area of the
excavation (see Figure 4). The sample will consist of at least five separate composite locations with
portions of each location’s aliquot being collected at multiple depths to accurately represent the
anticipated waste. All aliquots for the sample will then be placed in a plastic bag and homogenized prior
to placing the samples within appropriate laboratory supplied jars by gloved hand. The composite sample
will be immediately placed on ice and delivered to Chemtech-Ford Laboratories (CF), a Utah certified
laboratory, under chain-of-custody protocol for analysis of total lead using United States Environmental
Protection Agency (U.S. EPA) Method 6020A or B, TPH-GRO, methyl tertiary-butyl ether (MTBE),
benzene, toluene, ethylbenzene, xylenes, and naphthalene (MBTEXN) using U.S. EPA Method 8260D,
and TPH-DRO using U.S. EPA Method 8015D with silica gel treatment (SGT).

6.2 Excavation Confirmation Soil Sampling

To confirm that cleanup objectives have been met, Wasatch will collect confirmation soil samples.
Wasatch will collect one floor sample for every 500-square-foot area of floor within the excavation.
Additionally, a minimum of one sidewall sample will be collected from each sidewall of the main
excavation. If the anticipated size of the main excavation increases, sidewall samples will be collected for
at least every 25 linear feet of sidewall. Soil confirmation sample locations from the excavation walls will
be biased to the impacted depth intervals as indicated by subsurface investigation data, field observations
of grey to black staining, petroleum hydrocarbon odors, and elevated PID readings. Soil confirmation
samples collected from the walls and floor of the excavation will be collected using the track hoe bucket.
The track hoe bucket will be decontaminated with Alconox and water before collecting each sample. No
soil confirmation samples will be collected within backfill material.

Soil confirmation samples collected from the excavation will be collected with gloved hands and
dispensed into laboratory supplied 4-ounce glass jars. The samples will be immediately placed on ice
and delivered to CF, under chain-of-custody protocol, for analysis of TPH-GRO and MBTEXN using U.S.
EPA Method 8260D and TPH-DRO using U.S. EPA Method 8015D with SGT. All samples will be
analyzed on a laboratory 24-hour turn-around time.

6.3 Excavation Confirmation Groundwater Sampling

Wasatch anticipates encountering groundwater within the excavation. If groundwater is encountered,
Wasatch will collect at least two groundwater confirmation samples from the open excavation after the
dewatering activities, one from the up-gradient portion and one from the downgradient portion, using a
Teflon dipper. If the detected concentrations within the groundwater confirmation samples exceed any of
the Utah ISLs following the dewatering activities, additional dewatering activities will be completed and at
least two additional groundwater confirmation samples will be collected. The groundwater confirmation
samples will be collected with gloved hands and dispensed into the appropriate laboratory
supplied/preserved jars for the required analysis. The samples will be immediately placed on ice and
delivered to CF, under chain-of-custody protocol, for analysis of TPH-GRO and MBTEXN using U.S. EPA
Method 8260D, and TPH-DRO with SGT using U.S. EPA Method 8015D. All samples will be analyzed on
a laboratory 24-hour turn-around time.

7. CORRECTIVE ACTION IMPLEMENTATION REPORT

Following completion of the corrective action, Wasatch would produce a corrective action implementation
report documenting the results of the corrective action. The report would include:

• narrative text explaining objectives, methods, results, and presenting conclusions and
recommendations.
• comprehensive data tables.
• a figure depicting the extent of the excavation(s) and confirmation sample locations.
• site photographs.
• laboratory analytical reports.
Corrective Action Plan Former Smiths Gas and Video
Wasatch Environmental, Inc. 7

• copies of permits and approvals.
• a copy of the public notification.
• waste characterization data.
• receiving facility approvals; and
• waste manifests.

8. HEALTH AND SAFETY

All corrective action activities at the Site would be performed by Wasatch and our subcontractors in
accordance with Wasatch’s general health and safety policy. A site-specific health and safety plan would
also be prepared to address specific health and safety concerns and establish protocols for conducting
work related activities in a safe manner.

Figures

Former Smiths Gas and Video
Project Site
FIGURE
1
DRAWING DATEPROJECT NO.
Environmental Science and Engineering June 14, 20231171-008I
Former Smiths Gas and Video
905 West North Temple
Salt Lake City, Utah
Site Location Map
Scale: 1-inch equals
approximately 150 feet
North Temple
South Temple
10
0
0

W
e
s
t
90
0

W
e
s
t
80
0

W
e
s
t
300 North
I-15
100 South
FIGURE
2
DRAWING DATEPROJECT NO.
Environmental Science and Engineering June 14, 20231171-008I
Former Smiths Gas and Video
905 West North Temple
Salt Lake City, Utah
Site Feature Map
Scale: 1-inch equals
approximately 15 feet
North Temple
Former Smiths Gas & Video
(CWR Motors)
90
0

W
e
s
t
Asphalt
Approximate Site Boundary
Sig
n
Driveway
Driveway
Driveway
Unknown Utility Line
Natural Gas Line
Water Line
Sanitary Sewer Line
Storm Sewer Line
MW-E
MW-D
MW-A
MW-1R
MW-14MW-C
MW-2R
MW-B
MW-F
Existing Monitoring Well
Former
USTFormer UST
Former UST
Former
UST
Former Dispensers
Former
UST
FIGURE
3
DRAWING DATEPROJECT NO.
Environmental Science and Engineering June 14, 20231171-008I
Former Smiths Gas and Video
905 West North Temple
Salt Lake City, Utah
Selected Historical Sample Location Map
Scale: 1-inch equals
approximately 15 feet
North Temple
Former Smiths Gas & Video
(CWR Motors)
90
0

W
e
s
t
Asphalt
Approximate Site Boundary
Sig
n
Driveway
Driveway
Driveway
Former
USTFormer UST
Former UST
Former
UST
Former Dispensers
Former
UST
Unknown Utility Line
Natural Gas Line
Water Line
Sanitary Sewer Line
Storm Sewer Line
2022 Atlas/Alpine Remediation Boring Location
MW-E
MW-D
MW-A
MW-1R
MW-14
MW-C
MW-2R
MW-B
MW-F
Existing Monitoring Well and 2014 Cardno ATC Soil Sampling Location
FIGURE
4
DRAWING DATEPROJECT NO.
Environmental Science and Engineering June 14, 20231171-008I
Former Smiths Gas and Video
905 West North Temple
Salt Lake City, Utah
Proposed Excavation Map
Scale: 1-inch equals
approximately 15 feet
North Temple
Former Smiths Gas & Video
(CWR Motors)
90
0

W
e
s
t
Asphalt
Approximate Site Boundary
Sig
n
Driveway
Driveway
Driveway
Former
USTFormer UST
Former UST
Former
UST
Former Dispensers
Former
UST
Unknown Utility Line
Natural Gas Line
Water Line
Sanitary Sewer Line
Storm Sewer Line
MW-E
MW-D
MW-A
MW-1R
MW-14MW-C
MW-2R
MW-B
MW-F
Existing Monitoring Well and 2014 Cardno ATC Soil Sampling Location
Proposed Excavation Boundary
Proposed Clean Overburden
Soil Stockpile Area
Proposed Baker
Tank Placement
Potential Treated Groundwater
Discharge Point
*Client owns adjoining western and southern properties and plans to
demolish all buildings prior to Corrective Action Plan Implementation
to facilitate the field activities

Appendix A
Historical Data Tables and Select Isoconcentration Maps

Benzene Toluene Ethyl
Benzene
Total
Xylenes MTBE Naphthalene TPH-GRO TPH-DRO TPH
0.005 1 0.7 10 0.2 0.7 1 1 NE
0.3 3 4 10 0.2 0.7 10 10 NE
MW-1 08/21/95 14 E 0.49 2.5 6.4 NA 2.2 NA NA 380 NM NM
11/22/95 21 <0.5 2.7 6.5 NA 1.2 NA NA 35 8.97 91.11
11/22/95 14 0.32 2.9 6.2 NA 1.5 NA NA 42 8.97 91.11
03/27/96 20 E 1.3 3 5.5 NA 0.61 NA NA 51 8.15 91.93
06/25/96 27 E 0.23 3.6 7.3 NA 1 NA NA 46 8.86 91.22
09/03/96 22 E 0.29 3.8 6.9 NA 0.22 NA NA 43 8.61 91.47
11/07/96 37 E <0.2 2.3 4.5 <0.2 0.69 NA NA 150 8.57 91.51
02/17/97 30 E 0.39 3.1 7.2 <0.2 0.4 NA NA 48 8.58 91.50
06/04/97 9.7 E 2.1 1.9 2.9 <0.1 0.39 NA NA 19 8.51 91.57
08/29/97 25 E 0.86 3.4 5.9 <0.20 0.79 NA NA 92 8.77 91.31
11/25/97 14 E 0.31 2.6 E 5.0 E <0.04 0.51 NA NA 34 9.29 90.79
02/04/98 15 E 0.26 2.9 E 5.6 <0.04 0.54 NA NA 32 8.81 91.27
05/01/98 7.7 E 0.58 2 3.6 E 0.037 0.92 NA NA 26 8.40 91.68
08/07/98 20 E 0.73 3.4 E 7 E <0.05 0.65 NA NA 37 4.14 95.94
08/29/01 7.8 E 0.054 1.8 1.8 <0.04 0.56 NA NA 24 8.59 91.49
04/22/02 6.65 <0.01 0.78 1.23 <0.01 0.52 20.4 8 28.4 7.7 92.38
10/30/02 11.875 0.058 1.14 1.3785 <0.05 0.458 32.2 18.2 50.4 9.00 91.08
10/30/02 10.398 0.05 1.056 1.4435 <0.05 0.783 40 19.5 59.5 9.00 91.08
04/30/03 6.7 0.12 1.7 3.53 0.014 2.25 44.6 20.1 64.7 9.5 90.58
10/29/03 13.9 0.0751 0.94 2.62 <0.001 0.353 32.7 11.7 44.4 10.13 89.95
04/29/04 6.509 0.035 0.539 0.95 <.005 0.555 17.3 <1.0 17.3 8.42 91.66
10/14/04 6.62 0.0825 0.168 0.324 <.005 0.472 9.8 4.1 13.9 9.56 90.52
04/29/05 10 0.0312 0.233 0.154 <0.001 0.924 7.4 4 11.4 7.92 92.16
10/21/05 8.87 0.0589 0.758 2.2 <0.001 0.469 17.3 6.5 23.8 9.4 90.68
04/20/06 3.64 0.0213 0.3 0.363 <0.001 0.88 11.7 9.8 21.5 7.5 92.58
11/17/06 5.5 0.03 0.315 0.485 <0.001 0.76 42.3 26.1 68.4 9.27 90.81
04/20/07 6.16 0.036 0.56 1.4 <0.01 0.64 13.6 10.6 24.2 9.06 91.02
04/20/07 4.89 0.276 0.443 0.87 <0.001 0.0697 9.4 7.4 16.8 9.06 91.02
11/02/07 6.1 0.0289 0.35 0.592 <0.001 0.80 19.5 14 33.5 9.1 90.98
04/29/09 4.3 0.028 0.43 0.0072 <0.0025 0.44 10.3 8.9 19.2 8.91 91.17
10/23/09 4.74 0.0186 0.14 0.178 <0.01 0.64 50 44 94 9.23 90.85
04/22/09 4.13 0.024 0.238 0.37 <0.001 0.595 14.65 14.31 28.96 8.05 92.03
99.50 08/22/14 1.31 0.011 0.037 0.030 <0.005 0.181 4.32 F 4.5 X,M,F 8.82 8.77 90.73
8/22/2014*1.28 0.012 0.043 0.044 <0.005 0.160 5.45 F 3.8 X,M,F 9.25 ----
04/23/15 1.10 0.015 0.050 0.090 <0.005 0.134 4.60 F 1.7 X,M,F 6.3 8.58 90.92
09/11/15 1.52 <0.050 <0.050 <0.050 <0.050 <0.050 7.66 6.3 13.96 9.43 90.07
MW-1R 08/07/19 1.070 0.0266 J 0.0418 J 0.0558 J <0.0500 <0.0500 8.040 5.610 13.650 7.75 91.75
99.90 07/20/20 0.932 0.0163 0.0325 0.0413 <0.00100 <0.0500 7.220 2.590 9.810 8.84 91.06
02/23/22 0.779 0.0130 J 0.0730 0.271 J <0.00202 0.266 8.200 6.590 14.790 9.74 90.16
06/09/22 0.641 0.0139 J 0.0555 0.0291 J <0.00202 0.171 7.970 7.780 15.750 9.24 90.66
09/12/22 10.65 89.28
Relative
Groundwater
Elevation
(feet)
Well Location
No.
TABLE 1
Salt Lake City, Utah
Groundwater Monitoring and Analytical Results
Smith's Gas & Video
905 West North Temple Street
RBCA Initial Screening Level
Date
Groundwater Concentrations (mg/L)Depth to
Groundwater
(feet)
Not Sampled, 0.04' of free product measured in well
RBCA Tier 1 Screening Level
1 of 5
Benzene Toluene Ethyl
Benzene
Total
Xylenes MTBE Naphthalene TPH-GRO TPH-DRO TPH
0.005 1 0.7 10 0.2 0.7 1 1 NE
0.3 3 4 10 0.2 0.7 10 10 NE
Relative
Groundwater
Elevation
(feet)
Well Location
No.
TABLE 1
Salt Lake City, Utah
Groundwater Monitoring and Analytical Results
Smith's Gas & Video
905 West North Temple Street
RBCA Initial Screening Level
Date
Groundwater Concentrations (mg/L)Depth to
Groundwater
(feet)
RBCA Tier 1 Screening Level
MW-2 08/21/95 36.1 45.5 2.62 17.76 NA 0.36 NA NA 205 NM NM
08/21/95 17 E 17 E 2.3 12 NA 0.57 NA NA 200 NM NM
11/22/95 41 51 2.4 16.8 NA 1 NA NA 45 9.09 91.18
11/22/95 16 E 18 E 2.3 12 NA 0.49 NA NA 72 9.09 91.18
03/27/96 22 E 24 E 2.9 16 NA 0.24 NA NA 110 8.27 92.00
06/25/96 49 E 61 E 2.4 20 NA 0.53 NA NA 170 9.08 91.19
09/03/96 29 E 32 E 2.4 18 NA <0.2 NA NA 110 8.74 91.53
11/07/96 57 E 69 E 2 16 <0.2 <0.4 NA NA 180 8.71 91.56
02/17/97 39 E 49 E 3 19 <0.1 0.2 NA NA 130 8.86 91.41
06/04/97 8.2 11 2.5 9.7 <0.1 0.47 NA NA 46 8.67 91.60
08/29/97 20 28 E 3.3 18 <0.2 0.4 NA NA 81 8.94 91.33
11/25/97 13 E 22 E 2.4 E 15 E <0.04 0.31 NA NA 63 9.43 90.84
02/04/98 16 E 23 E 3.2 E 20 E <0.04 0.38 NA NA 81 8.98 91.29
05/01/98 8 E 8.7 E 1.9 8.3 E <0.02 0.58 NA NA 48 8.53 91.74
08/07/98 17 E 1.9 2.4 13 E <0.05 0.35 NA NA 46 3.65 96.62
08/29/01 7.2 E 17 2.9 16 E <0.01 0.52 NA NA 67 8.73 91.54
04/22/02 4.34 11.6 1.66 8.53 <0.05 0.4 130 5.9 135.9 7.85 92.42
10/30/02 8.413 21.615 2.061 15.343 <0.05 0.398 115 10.2 125.2 9 E 91.27 E
04/30/03 6.3 17 2.85 12.5 <0.001 0.3 118 10.2 128.2 9.2 91.07
10/29/03 9.55 31 3.55 16.15 <0.001 0.275 166 9.4 175.4 10.24 90.03
04/29/04 6.236 21.792 2.371 12.192 <0.005 0.436 134 <1 134 8.58 91.69
04/29/04 6.33 19.826 2.305 11.987 <0.005 0.407 113 <1 113 8.58 91.69
10/14/04 5.54 27.8 2.62 16.16 <0.005 0.26 105 1.2 106.2 9.71 90.56
04/29/05 7.93 106 2.55 60 <0.001 0.404 25 2.1 27.1 8 92.27
10/21/05 7.44 24.6 3.75 20.5 <0.001 0.332 9 <1 9 9.51 90.76
04/20/06 2.96 13.7 1.999 9.69 <0.001 0.85 77 10.1 87.1 7.2 E 93.07 E
11/17/06 4.3 15.1 2.7 16.45 <0.001 0.6 97.4 7.9 105.3 9.41 90.86
04/20/07 6.04 21.5 3.1 17.3 <0.01 0.33 103.9 3.7 107.6 9.25 91.02
11/02/07 4.45 13.2 2.91 15.8 <0.01 0.995 94 4.5 98.5 9.28 90.99
04/29/09 4.5 18 2.6 15.1 <0.012 0.31 62.7 4 66.7 9.10 91.17
10/23/09 4.5 12.5 2.16 11.7 <0.01 0.44 160 23 183 9.45 90.82
04/22/09 2.94 14.7 2.4 11.45 <0.1 0.487 31.07 6.58 37.65 8.30 91.97
99.81 08/22/14 1.55 1.19 1.59 7.52 <0.005 0.520 19.7 F 4.5 24.2 9.10 90.71
04/23/15 1.12 3.28 2.02 9.03 <0.005 0.623 19.5 F 1.3 X,M,F 20.8 8.94 90.87
09/11/15 1.10 1.20 1.20 5.32 <0.005 0.687 21.8 9.7 31.5 9.75 90.06
09/11/15*1.69 1.84 1.78 8.56 <0.005 0.656 28.3 9.0 37.3 ----
MW-2R 08/07/19 0.439 0.176 1.010 2.880 <0.0200 0.190 20.400 3.480 23.880 8.05 91.76
99.71 07/20/20 0.554 0.240 1.250 5.710 <0.0100 0.171 J 22.000 3.830 25.830 8.57 91.14
02/23/22 0.892 0.198 0.959 3.110 <0.00202 0.551 26.600 1.320 27.920 9.53 90.18
06/09/22 0.679 0.409 1.400 4.770 <0.00202 0.681 26.900 6.570 33.470 9.01 90.70
09/12/22 0.736 0.168 1.080 4.490 <0.00202 0.496 19.300 3.980 23.280 10.37 89.34
2 of 5
Benzene Toluene Ethyl
Benzene
Total
Xylenes MTBE Naphthalene TPH-GRO TPH-DRO TPH
0.005 1 0.7 10 0.2 0.7 1 1 NE
0.3 3 4 10 0.2 0.7 10 10 NE
Relative
Groundwater
Elevation
(feet)
Well Location
No.
TABLE 1
Salt Lake City, Utah
Groundwater Monitoring and Analytical Results
Smith's Gas & Video
905 West North Temple Street
RBCA Initial Screening Level
Date
Groundwater Concentrations (mg/L)Depth to
Groundwater
(feet)
RBCA Tier 1 Screening Level
MW-14 08/21/95 11 0.075 <0.06 0.11 NA 0.13 NA NA 35 NM NM
11/22/95 6 0.0076 0.0075 0.0354 NA 0.033 NA NA 1.5 9.21 90.53
11/22/95 5.3 0.15 <0.06 0.18 NA 0.14 NA NA 8.2 NM NM
03/27/96 8.8 E 4.4 E 0.23 1.3 NA 0.077 NA NA 24 8.36 91.38
06/25/96 13 E 2.4 0.14 1.2 NA 0.09 NA NA 20 8.77 90.97
09/03/96 18 E 1.6 0.36 3.6 NA <0.12 NA NA 34 8.69 91.05
11/07/96 14 0.6 <0.1 0.6 <0.1 <0.2 NA NA 20 8.68 91.06
02/17/97 16 1.9 0.2 1.2 <0.2 <0.4 NA NA 22 8.67 91.07
06/04/97 10 2.4 1.1 5.2 <0.1 <0.2 NA NA 37 8.52 91.22
08/29/97 25 E <0.2 0.87 5 <0.2 <0.40 NA NA 31 8.79 90.95
11/25/97 17 E <0.1 <0.1 0.86 <0.1 <0.2 NA NA 18 9.24 90.50
02/04/98 7.4 E <0.04 <0.04 0.071 <0.04 <0.08 NA NA 11 8.88 90.86
05/01/98 7.5 E 0.07 0.05 0.28 <0.02 0.14 NA NA 13 8.46 91.28
08/07/98 23 <0.5 0.5 2.8 <0.5 <1.0 NA NA 66 5.6 94.14
08/29/01 0.86 0.01 0.014 0.046 <0.002 0.0096 NA NA 1.3 8.26 91.48
04/22/02 9.5 0.029 0.031 0.079 <0.01 0.1 2.8 <1.0 2.8 7.98 91.76
10/30/02 12.098 <0.025 <0.025 <0.05 <0.05 <0.05 1.8 <1.0 1.8 8.6 91.14
04/30/03 5.6 0.2 0.007 0.024 <0.001 0.15 4.5 <1.0 4.5 9.5 90.24
04/30/03 5.5 0.17 0.0061 0.02 <0.001 0.13 2.8 <1.0 2.8 9.5 90.24
10/29/03 7.86 0.044 0.0152 0.0363 <0.001 0.0468 4.3 1.1 5.4 9.65 90.09
04/29/04 6.743 0.014 <0.005 0.039 <0.005 0.035 1.2 <1.0 1.2 8.55 91.19
10/14/04 2.5 0.0148 <0.005 0.0165 <0.005 0.0378 <1.0 <1.0 <1.0 9.37 90.37
04/29/05 <0.001 <0.001 <0.001 <0.001 <0.001 <0.001 <1.0 <1.0 <1.0 8.1 91.64
10/21/05 5 0.0127 0.0156 0.0408 <0.001 0.0322 2.60 <1.0 2.6 9.21 90.53
04/20/06 0.33 0.0076 0.0021 0.0106 <0.001 0.0061 <1.0 <1.0 <1.0 7.8 91.94
11/17/06 4.03 0.0094 0.0076 0.0321 <0.001 0.0058 1.34 <1.0 1.34 9.2 90.54
04/20/07 2.17 0.0047 0.005 0.0234 <0.001 0.0019 1 <1.0 1 9.04 90.70
11/02/07 4.5 0.0146 0.0119 0.132 <0.01 0.0081 2.7 1.1 3.8 9.00 90.74
04/29/09 2.1 0.0056 0.0071 0.0383 <0.062 0.0072 3 <1.0 3 8.94 90.80
10/23/09 1.83 0.0728 0.0272 0.2 <0.001 0.0007 2.2 0.6 2.8 9.09 90.65
04/22/09 1.18 0.0022 0.0021 0.0136 <0.001 0.0029 <1.0 <1.0 <1.0 8.29 91.45
99.72 08/22/14 8.30 0.049 2.23 8.12 <0.02 0.671 35.1 F 4.7 X,M,F 39.8 8.99 90.73
04/23/15 8.66 0.049 1.91 9.30 <0.01 0.821 26.1 F 4.2 X,M,F 30.3 8.93 90.79
04/23/15*8.21 0.046 2.18 8.29 <0.005 0.768 30.1 F 4.8 X,M,F 34.9 ----
09/11/15 6.67 <0.050 1.89 5.82 <0.050 1.14 28.9 16.0 44.9 9.58 90.14
08/07/19 6.030 0.0349 J 2.430 8.490 <0.050 0.627 52.300 6.220 58.520 7.88 91.84
07/20/20 7.060 0.0275 2.340 7.070 <0.0200 0.438 J 41.000 8.570 49.570 8.51 91.21
02/23/22 4.180 0.0150 1.120 2.870 <0.00101 0.448 21.600 9.120 30.720 9.65 90.07
06/09/22 0.424 <0.00278 0.00516 J 0.0341 <0.00101 0.0182 J 1.270 0.537 1.807 9.23 90.49
09/12/22 0.433 <0.00278 0.00752 J 0.0751 <0.00101 <0.0100 2.210 B 0.974 3.184 10.33 89.39
3 of 5
Benzene Toluene Ethyl
Benzene
Total
Xylenes MTBE Naphthalene TPH-GRO TPH-DRO TPH
0.005 1 0.7 10 0.2 0.7 1 1 NE
0.3 3 4 10 0.2 0.7 10 10 NE
Relative
Groundwater
Elevation
(feet)
Well Location
No.
TABLE 1
Salt Lake City, Utah
Groundwater Monitoring and Analytical Results
Smith's Gas & Video
905 West North Temple Street
RBCA Initial Screening Level
Date
Groundwater Concentrations (mg/L)Depth to
Groundwater
(feet)
RBCA Tier 1 Screening Level
MW-15 09/15/00 0.3 <0.02 0.3 <0.02 <0.1 0.021 1.9 0.43 2.33 10.95 89.29
12/20/00 0.089 <0.005 0.02 0.0096 <0.025 0.012 1.3 1 2.3 10.05 90.19
02/22/01 0.027 <0.001 0.014 0.015 <0.005 0.0024 0.27 <0.25 0.27 9.38 90.86
05/24/01 1 <0.025 0.3 0.51 <0.12 0.061 8.3 0.51 8.81 9.16 91.08
08/15/01 1.1 <0.05 0.26 0.53 <0.25 0.12 6.1 0.47 6.57 10.68 89.56
12/27/01 0.74 <0.02 0.034 0.33 <0.1 0.079 3.7 0.35 4.05 10.87 89.37
02/19/02 0.26 <0.02 0.03 0.077 <0.1 <0.02 1.9 <0.25 1.9 10.89 89.35
05/10/02 1.1 <0.067 0.44 0.42 <0.33 0.097 11 0.46 11.46 10.54 89.70
10/30/02 1.743 <0.025 <0.025 0.118 <0.05 0.0132 3.7 1.5 5.2 10.70 89.54
GW-5 05/01/02 <0.1 <0.1 <0.1 <0.2 3.2 <0.1 3.5 <0.25 3.5 10.95 88.97
10/30/02 <0.0005 <0.0005 <0.0005 <0.001 5.258 <0.001 1.2 <1.0 1.2 11.1 88.82
10/21/05 0.0022 0.0008J <0.001 0.001 0.0874 <0.001 <1.0 <1.0 <1.0 11 88.92
04/20/06 <0.005 0.0017 <0.001 0.0018 0.095 0.0019 <1.0 <1.0 <1.0 10.53 89.39
MW-A 08/22/14 0.018 0.026 0.049 0.210 <0.001 0.007 0.981 F <1 X,M,F 0.981 8.55 90.72
99.27 04/23/15 0.100 0.043 0.292 0.358 <0.005 0.051 2.55 F <1 X,M,F 2.55 8.53 90.74
09/11/15 0.074 0.051 0.254 0.552 <0.005 0.019 5.13 <1.0 5.13 9.21 90.06
08/07/19 0.00640 0.00111 0.00209 0.0132 <0.00100 0.00159 J 0.573 B 0.237 0.810 7.49 91.78
07/20/20 0.0220 0.00143 0.000596 J 0.00799 <0.00100 <0.00500 0.538 0.0335 0.5715 8.14 91.13
02/23/22 0.00632 0.00122 0.000170 J 0.00268 J <0.000101 <0.001 0.891 0.272 1.163 9.07 90.20
MW-B 08/22/14 3 Jcal 0.134 0.810 2.20 <0.001 0.222 13.1 F 3.4 16.5 8.77 90.71
99.48 04/23/15 2.05 0.055 0.332 1.16 <0.01 0.213 10.0 F <1 X,M,F 10.0 8.68 90.80
09/11/15 6.06 0.098 0.836 2.46 <0.050 0.342 17.6 4.8 22.4 9.34 90.14
08/07/19 1.060 0.0209 0.126 0.209 <0.0100 0.104 8.570 1.950 10.520 7.63 91.85
08/07/19*1.100 0.234 0.165 0.318 <0.00100 0.158 9.560 2.350 11.910 ----
07/20/20 1.910 0.0387 0.175 0.303 <0.00100 0.216 10.300 2.690 12.990 8.31 91.17
02/23/22 1.770 0.0333 0.0975 0.180 <0.000101 0.148 8.760 3.310 12.070 9.35 90.13
06/09/22 2.140 0.0734 0.262 0.753 <0.000101 0.234 15.300 4.280 19.580 8.79 90.69
09/12/22 0.816 0.0176 J 0.0885 0.140 <0.00202 0.121 7.900 3.080 10.980 10.05 89.43
MW-C 08/22/14 1.18 0.008 0.047 0.022 <0.001 0.253 4.08 F 3.5 X,M,F 7.58 9.08 90.69
99.77 04/23/15 0.483 0.004 0.015 0.018 <0.001 0.159 1.87 F <1 X,M,F 1.87 8.95 90.82
09/11/15 1.17 0.007 0.027 0.023 <0.005 0.246 4.29 4.00 8.29 9.83 89.94
08/07/19 0.694 0.0120 0.0351 0.0784 <0.0100 0.268 4.700 2.380 7.0800 8.03 91.74
07/20/20 0.296 0.00547 0.00493 0.00934 0.000324 J <0.0250 3.240 2.030 5.270 8.69 91.08
02/23/22 0.533 0.00651 0.00818 0.00995 0.000454 J 0.0409 4.360 3.750 8.110 9.64 90.13
06/09/22 0.584 0.00869 0.0107 0.0107 0.000381 J 0.0357 5.460 3.660 9.120 9.16 90.61
09/12/22 0.365 <0.00556 0.00397 J 0.00875 J <0.00202 <0.020 3.120 3.080 6.200 10.48 89.29
MW-D 08/22/14 0.018 <0.005 0.037 <0.015 <0.005 0.272 2.19 F 3.5 X,M,F 5.69 9.03 90.74
99.77 04/23/15 0.017 0.008 0.034 0.060 <0.005 0.081 1.94 F <1 X,M,F 1.94 8.83 90.94
09/11/15 0.008 <0.005 0.015 <0.005 <0.005 0.117 5.03 3.1 8.04 9.80 89.97
08/07/19 0.00694 0.000906 J 0.00993 0.00137 J <0.00100 0.0796 3.450 1.460 4.910 8.47 91.30
07/20/20 0.000336 J 0.000341 J 0.000984 J <0.00300 <0.00100 0.00398 J 1.170 0.513 1.683 8.81 90.96
02/23/22 0.000566 J 0.0019 0.00122 0.000454 J <0.000101 0.00816 1.660 0.825 2.485 9.54 90.23
06/09/22 NM --Not Sampled
4 of 5
Benzene Toluene Ethyl
Benzene
Total
Xylenes MTBE Naphthalene TPH-GRO TPH-DRO TPH
0.005 1 0.7 10 0.2 0.7 1 1 NE
0.3 3 4 10 0.2 0.7 10 10 NE
Relative
Groundwater
Elevation
(feet)
Well Location
No.
TABLE 1
Salt Lake City, Utah
Groundwater Monitoring and Analytical Results
Smith's Gas & Video
905 West North Temple Street
RBCA Initial Screening Level
Date
Groundwater Concentrations (mg/L)Depth to
Groundwater
(feet)
RBCA Tier 1 Screening Level
MW-E 08/22/14 0.001 <0.001 0.019 0.042 <0.001 0.005 0.887 F <1 X,M,F 0.887 9.15 90.68
99.83 04/23/15 0.009 0.002 0.011 0.020 <0.001 0.004 1.13 F <1 X,M,F 1.13 8.94 90.89
09/11/15 0.009 <0.005 0.067 0.025 <0.005 0.016 5.20 1.3 6.5 9.91 89.92
08/07/19 0.00623 <0.00500 <0.00500 <0.0150 <0.00500 0.0361 0.996 0.349 1.375 8.22 91.61
100.06 07/20/20 0.00326 0.000608 J 0.000821 J 0.00226 J <0.00100 <0.00500 2.010 0.513 2.523 9.15 90.91
02/23/22 0.00472 0.000623 J 0.000927 J 0.00230 J <0.000101 0.00201 J 2.000 0.693 2.693 9.90 90.16
06/09/22 NM --
MW-F 08/22/14 0.014 0.012 0.210 0.475 <0.005 0.043 4.09 F 3.0 X,M,F 7.09 9.28 90.72
100.00 04/23/15 0.010 0.007 0.030 0.032 <0.001 0.024 2.69 F <1 X,M,F 2.69 9.02 90.98
09/11/15 0.010 <0.005 0.045 0.018 <0.005 0.023 4.11 <1.0 4.11 10.00 90.00
08/07/19 0.00650 <0.0050 0.0225 0.0364 <0.00500 0.0108 J 2.390 0.600 2.990 8.30 91.70
07/20/20 0.00653 0.000774 J 0.00377 0.00607 <0.00100 0.00499 J 1.750 0.302 2.052 9.00 91.00
02/23/22 0.185 0.00377 0.00626 0.0106 <0.000101 0.0259 4.080 2.140 6.220 9.78 90.22
06/09/22 NM --
< = analyte not detected above the practical quantitation limit NM = Not Measured F = No Dual Column Confirmation
Jcal = Estimated Value. Results outside linear calibration range of instrument mg/L = milligrams per liter * = Field Duplicate
Bold = indicates Tier 1 Screening Level exceedence NE = Not Established X = Hexane used for extraction
TPH-GRO = gasoline-range total petroleum hydrocarbons RBCA = Risk-Based Corrective Action Screening Level M = Micro-extraction used for TPH-DRO
B = The same analyte is found in the associated blank NA = Not Analyzed
Not Sampled
Not Sampled
TPH-DRO = diesel-range total petroleum hydrocarbons
Notes:
5 of 5
GA
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GA
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GAS
GA
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GA
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GA
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GA
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GA
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GA
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GA
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GAS
GA
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GA
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GA
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GA
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GA
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GA
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GA
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GA
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GA
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GA
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GA
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GA
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GA
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GA
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GA
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GAS
GA
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GA
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GA
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GA
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GA
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GA
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GA
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GA
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GA
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GA
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GA
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GA
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GA
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GA
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GA
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GAS
GA
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GA
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GAS
Former Smith Gas & Video
Sample ID. No.MW-1 MW-1 MW-1 MW-1 MW-1 MW-1 MW-1
Date Sampled 3/25/2022 3/25/2022 3/25/2022 3/25/2022 3/25/2022 3/25/2022 3/25/2022
Sample Depth 4 6 8 10 12 14 16

Reporting
Limit Units Flags
Reporting
Limit Units Flags
Reporting
Limit Units Flags
Reporting
Limit Units Flags
Reporting
Limit Units Flags
Reporting
Limit Units Flags
Reporting
Limit Units Flags
Dimethyl Sulfide ND 50 ug/Kg ND 10 ug/Kg ND 0.5 ug/Kg ND 0.5 ug/Kg ND 10 ug/Kg ND 10 ug/Kg ND 10 ug/Kg
MTBE ND 50 ug/Kg ND 10 ug/Kg ND 0.5 ug/Kg ND 0.5 ug/Kg ND 10 ug/Kg ND 10 ug/Kg ND 10 ug/Kg
1,2-Dichloroethane ND 50 ug/Kg ND 10 ug/Kg ND 0.5 ug/Kg ND 0.5 ug/Kg ND 10 ug/Kg ND 10 ug/Kg ND 10 ug/Kg
Benzene 505 50 ug/Kg ND 10 ug/Kg 1.19 0.5 ug/Kg 17.3 0.5 ug/Kg 47.6 10 ug/Kg 63.2 10 ug/Kg 415 10 ug/Kg
Toluene 58.3 50 ug/Kg ND 10 ug/Kg ND 0.5 ug/Kg 3.28 0.5 ug/Kg ND 10 ug/Kg 10.8 10 ug/Kg 43.6 10 ug/Kg
Ethylbenzene 29000 50 ug/Kg 31.7 10 ug/Kg 0.71 0.5 ug/Kg 4.42 0.5 ug/Kg 75.9 10 ug/Kg 69.0 10 ug/Kg 154 10 ug/Kg
m/p-Xylene 1160 50 ug/Kg 14.9 10 ug/Kg 0.70 0.5 ug/Kg 4.26 0.5 ug/Kg 68.3 10 ug/Kg 17.8 10 ug/Kg 45.1 10 ug/Kg
o-Xylene ND 50 ug/Kg ND 10 ug/Kg ND 0.5 ug/Kg 1.51 0.5 ug/Kg ND 10 ug/Kg ND 10 ug/Kg ND 10 ug/Kg
1,2,4-Trimethylbenzene 893 50 ug/Kg 16.7 10 ug/Kg 0.63 0.5 ug/Kg 0.94 0.5 ug/Kg 23.7 10 ug/Kg 11.4 10 ug/Kg 18.4 10 ug/Kg
Naphthalene 20800 50 ug/Kg 68.9 10 ug/Kg 6.32 0.5 ug/Kg 7.11 0.5 ug/Kg 422 10 ug/Kg 158 10 ug/Kg 176 10 ug/Kg
TVPH 1510 50 mg/Kg 40.4 10 mg/Kg 0.85 0.5 mg/Kg 7.53 0.5 mg/Kg 251 10 mg/Kg 45.1 10 mg/Kg 170 10 mg/Kg
% Surrogate Recovery
1,2-Dichloroethane-d4 74 100 93 92 70 101 98
d8-Toluene 86 100 100 108 88 101 105
p-Bromofluorobenzene 142 102 112 123 107 93 109
DRO 11000 300 mg/Kg 300 30 mg/Kg ND 30 mg/Kg ND 30 mg/Kg 408 30 mg/Kg 59.9 30 mg/Kg 54.7 30 mg/Kg
DRO % Surrogate Recovery 94 100 95 79 109 105 101
Sample ID. No.MW-1 MW-1
Date Sampled 3/25/2022 3/25/2022
Sample Depth 18 20

Reporting
Limit Units Flags
Reporting
Limit Units Flags
Dimethyl Sulfide ND 0.5 ug/Kg ND 0.5 ug/Kg
MTBE ND 0.5 ug/Kg ND 0.5 ug/Kg
1,2-Dichloroethane ND 0.5 ug/Kg ND 0.5 ug/Kg
Benzene 319 0.5 ug/Kg 64.7 0.5 ug/Kg
Toluene 8.97 0.5 ug/Kg 3.63 0.5 ug/Kg
Ethylbenzene 15.7 0.5 ug/Kg 5.34 0.5 ug/Kg
m/p-Xylene 7.44 0.5 ug/Kg 12.3 0.5 ug/Kg
o-Xylene 1.69 0.5 ug/Kg 1.98 0.5 ug/Kg
1,2,4-Trimethylbenzene 1.55 0.5 ug/Kg 3.02 0.5 ug/Kg
Naphthalene 13.2 0.5 ug/Kg 6.12 0.5 ug/Kg
TVPH 8.50 0.5 mg/Kg ND 0.5 mg/Kg
% Surrogate Recovery
1,2-Dichloroethane-d4 95 100
d8-Toluene 105 99
p-Bromofluorobenzene 120 106
DRO NA 30 mg/Kg NA 30 mg/Kg
DRO % Surrogate Recovery
Sample ID. No.MW-2R MW-2R MW-2R MW-2R MW-2R MW-2R MW-2R
Date Sampled 3/25/2022 3/25/2022 3/25/2022 3/25/2022 3/25/2022 3/25/2022 3/25/2022
Sample Depth 4 6 8 10 12 14 16

Reporting
Limit Units Flags
Reporting
Limit Units Flags
Reporting
Limit Units Flags
Reporting
Limit Units Flags
Reporting
Limit Units Flags
Reporting
Limit Units Flags
Reporting
Limit Units Flags
Dimethyl Sulfide ND 0.5 ug/Kg ND 0.5 ug/Kg ND 0.5 ug/Kg ND 0.5 ug/Kg ND 50 ug/Kg ND 50 ug/Kg ND 50 ug/Kg
MTBE ND 0.5 ug/Kg ND 0.5 ug/Kg ND 0.5 ug/Kg ND 0.5 ug/Kg ND 50 ug/Kg ND 50 ug/Kg ND 50 ug/Kg
1,2-Dichloroethane ND 0.5 ug/Kg ND 0.5 ug/Kg ND 0.5 ug/Kg ND 0.5 ug/Kg ND 50 ug/Kg ND 50 ug/Kg ND 50 ug/Kg
Benzene 2.86 0.5 ug/Kg ND 0.5 ug/Kg 1.87 0.5 ug/Kg 0.84 0.5 ug/Kg 117 50 ug/Kg ND 50 ug/Kg 119 50 ug/Kg
Toluene 6.25 0.5 ug/Kg 0.62 0.5 ug/Kg 0.63 0.5 ug/Kg 0.56 0.5 ug/Kg 243 50 ug/Kg 138 50 ug/Kg 191 50 ug/Kg
Ethylbenzene 14.6 0.5 ug/Kg 0.61 0.5 ug/Kg 2.40 0.5 ug/Kg 1.30 0.5 ug/Kg 5500 50 ug/Kg 2460 50 ug/Kg 1410 50 ug/Kg
m/p-Xylene 37.2 0.5 ug/Kg 2.04 0.5 ug/Kg 4.55 0.5 ug/Kg 3.66 0.5 ug/Kg 6000 50 ug/Kg 11600 50 ug/Kg 3830 50 ug/Kg
o-Xylene 5.93 0.5 ug/Kg ND 0.5 ug/Kg 0.59 0.5 ug/Kg ND 0.5 ug/Kg 125 50 ug/Kg 229 50 ug/Kg 94.0 50 ug/Kg
1,2,4-Trimethylbenzene 9.92 0.5 ug/Kg 0.94 0.5 ug/Kg 1.48 0.5 ug/Kg 1.51 0.5 ug/Kg 7060 50 ug/Kg 5510 50 ug/Kg 1740 50 ug/Kg
Naphthalene 41.6 0.5 ug/Kg 11.2 0.5 ug/Kg 62.0 0.5 ug/Kg 32.2 0.5 ug/Kg 4780 50 ug/Kg 296 50 ug/Kg 513 50 ug/Kg
TVPH 0.80 0.5 mg/Kg ND 0.5 mg/Kg 7.03 0.5 mg/Kg 1.20 0.5 mg/Kg 1530 50 mg/Kg 52.5 50 mg/Kg 116 50 mg/Kg
% Surrogate Recovery
1,2-Dichloroethane-d4 109 97 104 97 70 99 64
d8-Toluene 95 97 102 100 89 100 100
p-Bromofluorobenzene 103 107 115 105 100 107 93
DRO 93.6 30 mg/Kg ND 30 mg/Kg ND 30 mg/Kg ND 30 mg/Kg 470 30 mg/Kg 61.4 30 mg/Kg NA 30 mg/Kg
DRO % Surrogate Recovery 99 96 75 87 113 87
Sample ID. No.MW-2R MW-2R
Date Sampled 3/25/2022 3/25/2022
Sample Depth 18 20

Reporting
Limit Units Flags
Reporting
Limit Units Flags
Dimethyl Sulfide ND 0.5 ug/Kg ND 0.5 ug/Kg
MTBE ND 0.5 ug/Kg ND 0.5 ug/Kg
1,2-Dichloroethane ND 0.5 ug/Kg ND 0.5 ug/Kg
Benzene 69.5 0.5 ug/Kg 338 0.5 ug/Kg
Toluene 29 0.5 ug/Kg 223 0.5 ug/Kg
Ethylbenzene 248 0.5 ug/Kg 119 0.5 ug/Kg
m/p-Xylene 690 0.5 ug/Kg E 403 0.5 ug/Kg
o-Xylene 19.5 0.5 ug/Kg 98.0 0.5 ug/Kg
1,2,4-Trimethylbenzene 271 0.5 ug/Kg 66.4 0.5 ug/Kg
Naphthalene 79.1 0.5 ug/Kg 19.4 0.5 ug/Kg
TVPH 25.5 0.5 mg/Kg E 4.68 0.5 mg/Kg
% Surrogate Recovery
1,2-Dichloroethane-d4 99 98
d8-Toluene 108 98
p-Bromofluorobenzene 114 99
DRO NA 30 mg/Kg NA 30 mg/Kg
DRO % Surrogate Recovery
Sample ID. No.MW-14 MW-14 MW-14 MW-14 MW-14 MW-14 MW-14
Date Sampled 3/25/2022 3/25/2022 3/25/2022 3/25/2022 3/25/2022 3/25/2022 3/25/2022
Sample Depth 4 6 8 10 12 14 16

Reporting
Limit Units Flags
Reporting
Limit Units Flags
Reporting
Limit Units Flags
Reporting
Limit Units Flags
Reporting
Limit Units Flags
Reporting
Limit Units Flags
Reporting
Limit Units Flags
Dimethyl Sulfide ND 0.5 ug/Kg ND 10 ug/Kg ND 0.5 ug/Kg ND 50 ug/Kg ND 100 ug/Kg ND 50 ug/Kg ND 25 ug/Kg
MTBE ND 0.5 ug/Kg ND 10 ug/Kg ND 0.5 ug/Kg ND 50 ug/Kg ND 100 ug/Kg ND 50 ug/Kg ND 25 ug/Kg
1,2-Dichloroethane ND 0.5 ug/Kg ND 10 ug/Kg ND 0.5 ug/Kg ND 50 ug/Kg ND 100 ug/Kg ND 50 ug/Kg ND 25 ug/Kg
Benzene 0.60 0.5 ug/Kg ND 10 ug/Kg 1.71 0.5 ug/Kg ND 50 ug/Kg 682 100 ug/Kg 1400 50 ug/Kg 593 25 ug/Kg
Toluene 0.56 0.5 ug/Kg ND 10 ug/Kg ND 0.5 ug/Kg ND 50 ug/Kg ND 100 ug/Kg 53.0 50 ug/Kg 26.1 25 ug/Kg
Ethylbenzene 2.17 0.5 ug/Kg ND 10 ug/Kg 2.08 0.5 ug/Kg 85.2 50 ug/Kg 16800 100 ug/Kg 11500 50 ug/Kg 281 25 ug/Kg
m/p-Xylene 5.82 0.5 ug/Kg ND 10 ug/Kg 3.13 0.5 ug/Kg 52.5 50 ug/Kg 33900 100 ug/Kg 41000 50 ug/Kg 1120 25 ug/Kg
o-Xylene 0.51 0.5 ug/Kg ND 10 ug/Kg ND 0.5 ug/Kg ND 50 ug/Kg ND 100 ug/Kg 76.6 50 ug/Kg ND 25 ug/Kg
1,2,4-Trimethylbenzene 1.82 0.5 ug/Kg ND 10 ug/Kg 0.80 0.5 ug/Kg ND 50 ug/Kg 53500 100 ug/Kg 28200 50 ug/Kg 565 25 ug/Kg
Naphthalene 13.8 0.5 ug/Kg 532 10 ug/Kg 27.6 0.5 ug/Kg 1950 50 ug/Kg 8060 100 ug/Kg 2940 50 ug/Kg 191 25 ug/Kg
TVPH 3.86 0.5 mg/Kg 101 10 mg/Kg 6.28 0.5 mg/Kg 173 50 mg/Kg 884 100 mg/Kg 549 50 mg/Kg ND 25 mg/Kg
% Surrogate Recovery 64 69 62 68 67 68 65
1,2-Dichloroethane-d4 95 100 98 101 96 94 99
d8-Toluene 94 97 98 97 98 97 96
p-Bromofluorobenzene
DRO NA 30 mg/Kg NA 30 mg/Kg 38.6 30 mg/Kg 500 30 mg/Kg 846 30 mg/Kg NA 30 mg/Kg NA 30 mg/Kg
DRO % Surrogate Recovery 42 66 59
Sample ID. No.MW-14 MW-14
Date Sampled 3/25/2022 3/25/2022
Sample Depth 18 20

Reporting
Limit Units Flags
Reporting
Limit Units Flags
Dimethyl Sulfide ND 25 ug/Kg ND 10 ug/Kg
MTBE ND 25 ug/Kg ND 10 ug/Kg
1,2-Dichloroethane ND 25 ug/Kg ND 10 ug/Kg
Benzene 553 25 ug/Kg 88.4 10 ug/Kg
Toluene ND 25 ug/Kg 10.1 10 ug/Kg
Ethylbenzene 48.0 25 ug/Kg 14.3 10 ug/Kg
m/p-Xylene 159 25 ug/Kg 56.6 10 ug/Kg
o-Xylene ND 25 ug/Kg ND 10 ug/Kg
1,2,4-Trimethylbenzene 63.0 25 ug/Kg 17.8 10 ug/Kg
Naphthalene 61.9 25 ug/Kg 23.5 10 ug/Kg
TVPH ND 25 mg/Kg ND 10 mg/Kg
% Surrogate Recovery 67 68
1,2-Dichloroethane-d4 101 101
d8-Toluene 94 93
p-Bromofluorobenzene
DRO NA 30 mg/Kg NA 30 mg/Kg
DRO % Surrogate Recovery
Sample ID. No.MW-B MW-B MW-B MW-B MW-B MW-B MW-B
Date Sampled 3/25/2022 3/25/2022 3/25/2022 3/25/2022 3/25/2022 3/25/2022 3/25/2022
Sample Depth 4 9 10 12 14 16 18

Reporting
Limit Units Flags
Reporting
Limit Units Flags
Reporting
Limit Units Flags
Reporting
Limit Units Flags
Reporting
Limit Units Flags
Reporting
Limit Units Flags
Reporting
Limit Units Flags
Dimethyl Sulfide ND 0.5 ug/Kg ND 0.5 ug/Kg ND 0.5 ug/Kg ND 50 ug/Kg ND 50 ug/Kg ND 50 ug/Kg ND 0.5 ug/Kg
MTBE ND 0.5 ug/Kg ND 0.5 ug/Kg ND 0.5 ug/Kg ND 50 ug/Kg ND 50 ug/Kg ND 50 ug/Kg ND 0.5 ug/Kg
1,2-Dichloroethane ND 0.5 ug/Kg ND 0.5 ug/Kg ND 0.5 ug/Kg ND 50 ug/Kg ND 50 ug/Kg ND 50 ug/Kg ND 0.5 ug/Kg
Benzene ND 0.5 ug/Kg 13.7 0.5 ug/Kg 109 0.5 ug/Kg 555 50 ug/Kg 596 50 ug/Kg 1470 50 ug/Kg 1470 50 ug/Kg
Toluene ND 0.5 ug/Kg 1.6 0.5 ug/Kg 12.2 0.5 ug/Kg 109 50 ug/Kg 116 50 ug/Kg 130 50 ug/Kg 8.97 0.5 ug/Kg
Ethylbenzene 0.56 0.5 ug/Kg 1.44 0.5 ug/Kg 14.5 0.5 ug/Kg 1670 50 ug/Kg 1320 50 ug/Kg 1080 50 ug/Kg 28.1 0.5 ug/Kg
m/p-Xylene 1.35 0.5 ug/Kg 3.79 0.5 ug/Kg 31.2 0.5 ug/Kg 239 50 ug/Kg 6090 50 ug/Kg 4880 50 ug/Kg 103 0.5 ug/Kg
o-Xylene ND 0.5 ug/Kg 0.99 0.5 ug/Kg 7.07 0.5 ug/Kg ND 50 ug/Kg 1920 50 ug/Kg 1050 50 ug/Kg 22.5 0.5 ug/Kg
1,2,4-Trimethylbenzene 1.26 0.5 ug/Kg 1.93 0.5 ug/Kg 7.10 0.5 ug/Kg 65.9 50 ug/Kg 2280 50 ug/Kg 1910 50 ug/Kg 21.1 0.5 ug/Kg
Naphthalene 3.18 0.5 ug/Kg 1.84 0.5 ug/Kg ND 0.5 ug/Kg 590 50 ug/Kg 211 50 ug/Kg 258 50 ug/Kg 3.89 0.5 ug/Kg
TVPH ND 0.5 mg/Kg 1.53 0.5 mg/Kg 97.2 10 mg/Kg 119 50 mg/Kg ND 50 mg/Kg 93.8 50 mg/Kg 2.16 0.5 mg/Kg
% Surrogate Recovery
1,2-Dichloroethane-d4 105 103 103 93 97 63 100
d8-Toluene 97 107 119 106 99 101 99
p-Bromofluorobenzene 94 106 129 104 104 95 110
DRO NA 30 mg/Kg 194 30 mg/Kg 128 30 mg/Kg 153 30 mg/Kg 51.8 30 mg/Kg NA 30 mg/Kg NA 30 mg/Kg
DRO % Surrogate Recovery 97 103 96 96
Sample ID. No.MW-B
Date Sampled 3/25/2022
Sample Depth 20

Reporting
Limit Units Flags
Dimethyl Sulfide ND 0.5 ug/Kg
MTBE ND 0.5 ug/Kg
1,2-Dichloroethane ND 0.5 ug/Kg
Benzene 250 0.5 ug/Kg
Toluene 23.6 0.5 ug/Kg
Ethylbenzene 21.1 0.5 ug/Kg
m/p-Xylene 52.3 0.5 ug/Kg
o-Xylene 15.3 0.5 ug/Kg
1,2,4-Trimethylbenzene 12.0 0.5 ug/Kg
Naphthalene 1.33 0.5 ug/Kg
TVPH ND 0.5 mg/Kg
% Surrogate Recovery
1,2-Dichloroethane-d4 93
d8-Toluene 97
p-Bromofluorobenzene 110
DRO NA 30 mg/Kg
DRO % Surrogate Recovery
Sample ID. No.MW-C MW-C MW-C MW-C MW-C MW-C MW-C
Date Sampled 3/25/2022 3/25/2022 3/25/2022 3/25/2022 3/25/2022 3/25/2022 3/25/2022
Sample Depth 4 6 8 10 12 14 16

Reporting
Limit Units Flags
Reporting
Limit Units Flags
Reporting
Limit Units Flags
Reporting
Limit Units Flags
Reporting
Limit Units Flags
Reporting
Limit Units Flags
Reporting
Limit Units Flags
Dimethyl Sulfide ND 0.5 ug/Kg ND 0.5 ug/Kg ND 0.5 ug/Kg ND 50 ug/Kg ND 50 ug/Kg ND 50 ug/Kg ND 10 ug/Kg
MTBE ND 0.5 ug/Kg ND 0.5 ug/Kg ND 0.5 ug/Kg ND 50 ug/Kg ND 50 ug/Kg ND 50 ug/Kg ND 10 ug/Kg
1,2-Dichloroethane ND 0.5 ug/Kg ND 0.5 ug/Kg ND 0.5 ug/Kg ND 50 ug/Kg ND 50 ug/Kg ND 50 ug/Kg ND 10 ug/Kg
Benzene 1.02 0.5 ug/Kg ND 0.5 ug/Kg ND 0.5 ug/Kg ND 50 ug/Kg ND 50 ug/Kg 85.2 50 ug/Kg 58.7 10 ug/Kg
Toluene ND 0.5 ug/Kg ND 0.5 ug/Kg ND 0.5 ug/Kg ND 50 ug/Kg ND 50 ug/Kg ND 50 ug/Kg ND 10 ug/Kg
Ethylbenzene ND 0.5 ug/Kg ND 0.5 ug/Kg ND 0.5 ug/Kg ND 50 ug/Kg ND 50 ug/Kg 55.6 50 ug/Kg ND 10 ug/Kg
m/p-Xylene 0.52 0.5 ug/Kg ND 0.5 ug/Kg ND 0.5 ug/Kg 102 50 ug/Kg 50.9 50 ug/Kg 87.6 50 ug/Kg 11.6 10 ug/Kg
o-Xylene ND 0.5 ug/Kg ND 0.5 ug/Kg ND 0.5 ug/Kg ND 50 ug/Kg ND 50 ug/Kg ND 50 ug/Kg ND 10 ug/Kg
1,2,4-Trimethylbenzene ND 0.5 ug/Kg ND 0.5 ug/Kg ND 0.5 ug/Kg ND 50 ug/Kg ND 50 ug/Kg 297 50 ug/Kg 58.1 10 ug/Kg
Naphthalene ND 0.5 ug/Kg ND 0.5 ug/Kg ND 0.5 ug/Kg 133 50 ug/Kg 96.1 50 ug/Kg 627 50 ug/Kg 36.8 10 ug/Kg
TVPH ND 0.5 mg/Kg ND 0.5 mg/Kg ND 0.5 mg/Kg 65.6 50 mg/Kg 60.2 50 mg/Kg 133 50 mg/Kg 21.1 10 mg/Kg
% Surrogate Recovery
1,2-Dichloroethane-d4 96 98 98 62 63 65 65
d8-Toluene 96 96 97 100 100 99 99
p-Bromofluorobenzene 102 97 103 94 94 96 95
DRO NA 30 mg/Kg NA 30 mg/Kg NA 30 mg/Kg NA 30 mg/Kg NA 30 mg/Kg NA 30 mg/Kg NA 30 mg/Kg
DRO % Surrogate Recovery
Sample ID. No.MW-C MW-C
Date Sampled 3/25/2022 3/25/2022
Sample Depth 18 20

Reporting
Limit Units Flags
Reporting
Limit Units Flags
Dimethyl Sulfide ND 0.5 ug/Kg ND 10 ug/Kg
MTBE ND 0.5 ug/Kg ND 10 ug/Kg
1,2-Dichloroethane ND 0.5 ug/Kg ND 10 ug/Kg
Benzene 42.7 0.5 ug/Kg 25.4 10 ug/Kg
Toluene 2.61 0.5 ug/Kg ND 10 ug/Kg
Ethylbenzene 1.5 0.5 ug/Kg ND 10 ug/Kg
m/p-Xylene 3.94 0.5 ug/Kg 13.4 10 ug/Kg
o-Xylene 0.6 0.5 ug/Kg ND 10 ug/Kg
1,2,4-Trimethylbenzene 1.77 0.5 ug/Kg ND 10 ug/Kg
Naphthalene 1.68 0.5 ug/Kg 21.8 10 ug/Kg
TVPH 1.51 0.5 mg/Kg ND 10 mg/Kg
% Surrogate Recovery
1,2-Dichloroethane-d4 96 64
d8-Toluene 101 101
p-Bromofluorobenzene 114 93
DRO NA 30 mg/Kg NA 30 mg/Kg
DRO % Surrogate Recovery

Appendix B
Proposed Cleanup Levels

Initial Screening Levels
November 1, 2005

Contaminants

Groundwater
(mg/L)

Soil
(mg/kg)
Benzene 0.005 0.2
Toluene 1.0 9
Ethylbenzene 0.7 5
Xylenes 10.0 142
Naphthalene 0.7 51
Methyl t-butyl ether (MTBE) 0.2 0.3
Total Petroleum Hydrocarbons
(TPH) as gasoline 1 150
Total Petroleum Hydrocarbons (TPH)
as diesel 1 500
Oil and Grease or Total Recoverable
Petroleum
Hydrocarbons (TRPH) 10 1000

Appendix C
Vapor Barrier Specifications and Installation Instructions

Appendix D
Example Public Notification

PUBLIC NOTICE

PUBLIC NOTIFICATION AND COMMENT PERIOD
July 25, 2023 - August 25, 2023
Start Date End Date

Leaking Underground Storage Tank Petroleum Cleanup Project
(Former Smiths Gas and Video, Facility ID 4000251, Release Site IUQ,
located at 905 West North Temple, Salt Lake City, Utah)

J Fisher Companies is requesting approval from the Utah Department of Environmental
Quality, Division of Environmental Response and Remediation (DERR) to remediate
petroleum-contaminated soil and groundwater at the former Smiths Gas and Video facility.
The environmental consultant for this project is Wasatch Environmental, Inc.

Site Description
The Site is located at 905 West North Temple in Salt Lake City, Utah. The facility most recently
operated as Salt City Auto a used automotive dealer and repair shop. Our research indicates the
Site was residential from at least 1891 to 1947, when it was converted to a gasoline/service
station. The Site was occupied by two gasoline/service stations until least 1985. The Site was
occupied by Smith’s Gas and Video in at least 1991. Since 2003, the Site has been occupied by
several used car dealerships. The Site was identified as a former underground storage tank
(UST) and leaking underground storage tank (LUST) site. Regulatory agency information
documents that one 250-gallon used oil UST was removed from the Site in 1974; one 8,000-
gallon gasoline UST, one 6,000-gallon gasoline UST, and one 4,000-gallon diesel fuel UST were
removed from the Site in 1997; and two 4,000-gallon USTs with contents unknown were
removed from the Site in 2018. Since 1995, numerous subsurface investigations and
groundwater monitoring activities associated with the former USTs have been conducted. On-
going groundwater monitoring activities are still being conducted at the Site. The results of the
subsurface investigations and groundwater monitoring activities indicate that soil and
groundwater at the Site are impacted with petroleum hydrocarbons at concentrations that exceed
current Utah Initial Screening Levels (ISLs) and Risk-Based Corrective Action Tier 1 Screening
Levels remain in the central, northwestern, and western portions of the Site.

Cleanup Measures
The proposed cleanup approach is excavation of impacted soil and extraction of impacted
groundwater, and will consist of the following:
1) Excavation and off-site disposal of impacted soil.
2) Extraction and on-site treatment then disposal of impacted groundwater.
3) Installation of vapor barriers under the new residential structures, if required.

Schedule
Corrective action work is planned to begin approximately mid-March 2024 and is expected
to take approximately three to five weeks.

To Submit Comments or For More Information
A copy of the Corrective Action Plan for this site is available online at
http://eqedocs.utah.gov, or at the DERR in Salt Lake City (address below; office hours
8:00 a.m. to 5:00 p.m., Monday through Friday) and at the Salt Lake City Public Library
located at 210 East 400 South. To submit written comments or for additional
information, please contact:

Avery Holyoak, Project Manager (801-536-4100)
Division of Environmental Response and Remediation
195 North 1950 West
P.O. Box 144840
Salt Lake City, Utah 84114-4840

PLEASE NOTE: Public comment is a pre-requisite to challenging permitting decisions. Under Utah Code Ann. § 19-1-301.5(4) and (6)(e), a
person who wishes to challenge an order, application or determination may only raise an issue or argument in a petition for review if the person
raised that issue or argument during the public comment period, and the issue or argument was supported with information or documentation
that is cited with reasonable specificity, and sufficiently enables the Director to fully consider the substance and significance of the issue.
Former Smiths Gas and Video
Project Site
FIGURE
1
DRAWING DATEPROJECT NO.
Environmental Science and Engineering June 14, 20231171-008I
Former Smiths Gas and Video
905 West North Temple
Salt Lake City, Utah
Public Notice Delivery Map
Scale: 1-inch equals
approximately 150 feet
North Temple
South Temple
10
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90
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W
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W
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