DERR-2025-003433

Stantec Consulting Services Inc.
2890 East Cottonwood Parkway
Suite 300
Salt Lake City UT 84121-7283
April 29, 2025
Project/File: 203724520
Liberty Coe
Utah Department of Environmental Quality
Division of Environmental Response and Remediation
195 North 1950 West, First Floor
Salt Lake City, Utah 84116
Reference: Work Plan and Budget NGN-17: Corrective Action Plan Execution
7-Eleven Store No. 35508
712 South State Street, Clearfield, Utah
Facility ID 3000334, Release Site NGN
Dear Ms. Coe,
On behalf of 7-Eleven, Inc. (7-Eleven), Stantec Consulting Services Inc. (Stantec) has prepared the following
work plan and budget (WP&B) to perform remedial excavation and groundwater removal as the Corrective
Action Plan (CAP) at 7-Eleven Store No. 35508 (the Site), located at 712 South State Street, Clearfield, Utah
(Figure 1). The Utah Department of Environmental Quality (UDEQ), Division of Environmental Response and
Remediation (DERR) refers to the Site as Facility ID 3000334 and Release Site NGN. The Site is eligible for
reimbursement under the Utah Petroleum Storage Tank Trust Fund. The scope of work proposed herein
would be designated as WP&B NGN-17.
WP&B NGN-17 presents a summary of the public notification process and the remedial alternatives
evaluation authorized under WP&B NGN-16 and a technical approach and cost estimate for the following
WP&B NGN-17 scope of work.
 Remedial excavation and off-site disposal of petroleum impacted soils and addition of agricultural
gypsum soil amendment
 Groundwater removal, on-site treatment, and discharge via the North Davis Sewer District (NDSD)
 Reporting
 Reimbursement services
Public Notification Summary
DERR provided approval of the public notice document prepared by Stantec via email on April 8, 2025. On
April 9, Stantec distributed hard copies of the public notice (with the CAP meeting summary letter as an
attachment) to the following adjacent businesses.
 Kyle Long at Caliber Collison located at 520 East 700 South
 Kathy Hamm at Utah Title Loans located at 710 South State Street
No one was present at Westbridge Auto on April 9. On April 10, Stantec emailed a copy of the public notice
and CAP meeting summary letter to Aaron Olsen of Westbridge Auto. Stantec has not received any public
comments regarding the CAP to date.
April 29, 2025
Page 2 of 7
Reference: Work Plan and Budget NGN-17: Corrective Action Plan Execution
7-Eleven Store No. 35508
712 South State Street, Clearfield, Utah
Facility ID 3000334, Release Site NGN

Remedial Alternatives Evaluation
Stantec conducted a remedial alternatives evaluation to compare potential remedial alternatives to mitigate
soil and groundwater impacts at the Site following underground storage tank removal. Potential remedial
alternatives included excavation and off-site disposal of source area soils, off-site disposal of groundwater or
on-site treatment with on-site discharge to the NDSD, and application of a soil amendment to address soil
and groundwater impacts that may not be mitigated by soil excavation and disposal and treatment of pumped
groundwater.
Soil Excavation and Disposal
Soil excavation was chosen as part of the CAP because it was anticipated that petroleum impacted soil (PIS)
would be exposed during UST closure activities. Off-site disposal of PIS is feasible because of the relative
proximity of the Site to the ET Technologies Soil Regeneration Site (SRS).
Groundwater
Based on an anticipated total excavation depth of 15 feet below ground surface and historical data indicating
a relatively fast groundwater recharge rate (a 30-day CalClean dual phase extraction event in 2017 and
numerous single-day dual phase extraction events via vacuum truck) Stantec anticipated that excavation
dewatering will be necessary to maintain excavation wall stability. As groundwater pumped from the
excavation will be impacted with petroleum hydrocarbons, off-site disposal or treatment prior to on-site
discharge will be a necessary component of the CAP.
Through communication with Jonas Reeder (the Industrial Pretreatment Coordinator for the NDSD) Stantec
learned that there is no fee associated with discharge of pretreated industrial process water into the NDSD.
Charges may be imposed if industrial discharges cause process disruptions at the NSDS. Some cost will be
associated with monitoring the volume of groundwater discharged to the NDSD and laboratory analysis of
effluent samples. Off-site disposal of groundwater was not evaluated further due to the relatively low costs
of discharge to the NDSD.
Two on-site groundwater treatment techniques were evaluated for the pumped groundwater: granular
activated carbon (GAC) treatment and air sparging (AS) in an open top frac tank. AS treatment of the pumped
groundwater was found to be advantageous over GAC treatment for two main reasons. The AS treatment
timeframe can be shorter than typical gravity fed GAC treatment systems. Also, relatively high petroleum
hydrocarbon concentrations are expected which could saturate the GAC and cause concentration break
through.
Soil Amendment
Stantec evaluated two soil amendments to address soil and groundwater impacts that may remain after and
groundwater pumping and treatment: BOS 200® and agricultural gypsum. Agricultural gypsum was chosen
based on its lower cost and better applicability as a soil amendment coupled with impacted soil excavation.
April 29, 2025
Page 3 of 7
Reference: Work Plan and Budget NGN-17: Corrective Action Plan Execution
7-Eleven Store No. 35508
712 South State Street, Clearfield, Utah
Facility ID 3000334, Release Site NGN

The recommended dosage rate of both BOS 200® and agricultural gypsum is one percent by weight of the
backfill material. Stantec’s estimated delivered price of BOS 200® is $12,000 per ton, whereas the estimated
delivered price of agricultural gypsum is $550 per ton. Due to the significant relative cost of BOS 200® it was
not evaluated further as a soil amendment.
Stantec conducted monitored natural attenuation (MNA) parameters sampling on April 16 through 18, 2025.
Samples were submitted for analysis of nitrate and sulfate by United States Environmental Protection Agency
(EPA) Method 9056A, dissolved iron by EPA Method 6020B, and dissolved methane by the RKS-175 Method.
Samples were submitted for 4-day rush turnaround to Pace Analytical National of Mount Juliet, Tennessee.
The MNA parameters analytical results (presented in Table 1) indicated that concentrations of known electron
acceptors utilized in anaerobic biological degradation were lower in impacted groundwater monitoring wells
compared to non-impacted wells. Impacted wells also exhibited higher concentrations of dissolved methane
compared to non-impacted wells indicating methanogenesis is occurring. Methanogenesis degrades
petroleum hydrocarbons more slowly than other anaerobic biological degradation processes that utilize other
electron acceptors.
Agricultural gypsum was selected as a soil amendment to be mixed with backfill material to provide sulfate
as an electron acceptor to promote further anaerobic biological degradation for the following reasons.
 Gypsum soil amendment is a relatively low-cost addition to the existing soil excavation and disposal
and groundwater treatment and discharge scope of work.
 Impacted groundwater monitoring wells show lower concentrations of known anaerobic biological
degradation electron acceptors and higher concentrations of dissolved methane than non-impacted
wells.
 Gypsum will provide sulfate as an alternative electron acceptor allowing for enhanced anaerobic
biological degradation of petroleum hydrocarbons through sulfate reduction instead of relatively slower
degradation through methanogenesis.
Scope of Work
Task 1.1 – Remedial Excavation
The UST system removal is scheduled to begin on Monday, May 5, 2025. Spackman Enterprises
(Spackman) has been selected as the tank removal contractor. The UST system removal and closure
sampling will be completed prior to beginning any portion of the remedial excavation scope of work. It is
estimated that the UST system removal and closure sampling will be completed by May 7, and remedial
excavation will be able to begin on May 7. Costs for the portion of the excavation necessary to remove the
UST system will be the responsibility of 7-Eleven, and reimbursement will not be requested for those costs.
The proposed maximum lateral extent of the remedial excavation is shown in Figure 1; the actual extent of
the excavation (both laterally and vertically) will be determined based on field screening observations (soil
staining and photoionization detector [PID] readings) coupled with soil sample laboratory analytical results.
April 29, 2025
Page 4 of 7
Reference: Work Plan and Budget NGN-17: Corrective Action Plan Execution
7-Eleven Store No. 35508
712 South State Street, Clearfield, Utah
Facility ID 3000334, Release Site NGN

Stantec will oversee soil potholing by Spackman on Monday, May 5, 2025. Potholing will provide soil samples
for waste characterization analytical data requirements and begin to provide soil analytical data to correlate
with field screening observations. Potholing samples will be submitted for 24-hour rush turn around. UST
closure soil samples will also be submitted for 24-hour rush turn around. If it is determined that soil analytical
results correlate well with field screening observations, 24-hour rush turn around may not be necessary for
remedial excavation confirmation samples.
The excavation extents may also be limited by Site infrastructure. Shoring will not be used; therefore,
Spackman will use excavation sloping to provide stability to the excavation walls and protect existing
infrastructure. This may limit the lateral and vertical extents of the excavation.
The proposed maximum excavation extents were assumed based on a history of measurable light non-
aqueous phase liquid (LNAPL) being present in monitoring wells MW-2 and MW-2R, historical soil and
groundwater analytical data, and the age of the release. Table 2 shows historical soil analytical results. In
addition to a history of measurable LNAPL at MW-2 and MW-2R, soil samples collected from the soil borings
for MW-2 and MW-2R showed concentrations above UDEQ DERR Petroleum Storage Tank (PST) Branch
Initial Screening Levels (ISLs). Measurable LNAPL was also detected at MW-5/5R in March and June 2017.
Historical dissolved petroleum hydrocarbon concentrations at MW-5/5R have consistently remained above
ISLs and Tier 1 Screening Levels.
Monitoring wells MW-2 and MW-2R will likely be destroyed during remedial excavation activities. MW-5R
maybe be destroyed as well. It is Stantec’s intention to maintain monitoring wells MW-1 and MW-3. Following
CAP execution, Stantec will prepare a WP&B for follow-up groundwater monitoring and sampling; that WP&B
will also include replacement of any monitoring wells destroyed during remedial excavation.
Using the anticipated area of the remedial excavation and a planned total excavation depth of 15 feet below
the original ground surface, Stantec estimates that approximately 2,700 tons of soil will be excavated (in
addition to the volume of soil excavated to remove the UST system). It is anticipated that the 2,700 ton total
excavation soil volume may include up to 1,300 tons of PIS. Excavated soils will be screened for visual
staining and using a PID and segregated into PIS and non-impacted stockpiles. Non-impacted soil that is
deemed suitable for use as backfill will be stockpiled on site for later use. Stantec will coordinate disposal of
PIS at the ET Technologies SRS.
Stantec anticipates the collection of up to 13 soil confirmation samples (in addition to the required UST closure
soil samples) from the excavation bottom and sidewalls; proposed confirmation soil sample locations are
shown on Figure 1. Samples will be collected by a PST Branch certified soil and groundwater sampler.
Samples will be collected from the excavator bucket; neither Stantec nor Spackman personnel will enter the
excavation to collect samples. Samples will be collected into laboratory supplied containers, labeled with the
sample identification, collection date, and time, and placed into an ice chilled cooler for delivery to the project
laboratory under chain-of-custody (COC) documentation.
April 29, 2025
Page 5 of 7
Reference: Work Plan and Budget NGN-17: Corrective Action Plan Execution
7-Eleven Store No. 35508
712 South State Street, Clearfield, Utah
Facility ID 3000334, Release Site NGN

Samples will be submitted for analysis of methyl tertiary-butyl ether, benzene, toluene, ethylbenzene, total
xylenes, and naphthalene (MBTEXN) by EPA Method 8260 and gasoline range total petroleum hydrocarbons
(TPH-GRO) and diesel range TPH (TPH-DRO) by EPA Method 8015. Samples will be submitted to
Chemtech-Ford Analytical Laboratories (Chemtech-Ford) of Sandy, Utah.
Spackman will provide additional backfill material as needed to account for excavated soil that is removed
from the site. Backfill material and labor costs resulting from excavation of PIS will be submitted for
reimbursement; however, costs associated with the UST closure backfilling will be accounted for separately
and will not be submitted for reimbursement. Agricultural gypsum will be mixed with backfill material as a
sulfate amendment to promote continued anaerobic biological degradation within the dissolved plume.
Gypsum will be mixed with backfill material via the excavator bucket.
Task 1.2 – Groundwater Removal
It is anticipated that petroleum impacted groundwater will be encountered at a depth between11 and 12 feet
below ground surface. Spackman will provide dewatering services in conjunction with the remedial
excavation to maintain excavation stability. Groundwater will be pumped into an open top, 17,000-gallon frac
tank on site and treated via AS prior to discharge into the NDSD. For the purposes of this work plan, Stantec
estimates that a total of approximately 19,000 gallons of groundwater will be removed from the excavation.
To the extant practical, in an effort to minimize the amount of groundwater produced by dewatering,
excavation will be conducted in approximate north to south cross sections and proceed to the southwest.
Should groundwater production exceed estimates, Spackman has the capability to bring an additional frac
tank on site within the same day.
Stantec has submitted a NDSD industrial discharge permit application to discharge the treated groundwater.
The discharge permit will require Stantec to collect three effluent samples: one each at the beginning, middle,
and end of the project. Samples will be collected into laboratory containers, labeled with the sample
identification, collection date, and time, and placed into an ice chilled cooler for delivery to the project
laboratory under chain-of-custody (COC) documentation. Samples will be submitted for 24-hour rush
analysis of (MBTEXN) by EPA Method 8260 and TPH-GRO) and TPH-DR) by EPA Method 8015. Samples
will be submitted to Chemtech-Ford.
The UDEQ Division of Air Quality (DAQ) New Source Review Section requires submission of their Form 16
to document the estimated emissions from soil and groundwater hydrocarbon remediation projects. Stantec
has completed the required emissions estimates for the processes of excavating PIS and air sparging
hydrocarbon impacted groundwater within a frac tank. The estimated emissions are well below the annual
small source exemption criteria listed in Utah Administration Code R301-401-9 of less than five tons of volatile
organic compounds, 500 pounds of any hazardous air pollutant (HAP), and less than one ton of combined
HAPs. Stantec will submit DAQ New Source Review Section Form 16 and associated emissions estimates
prior to the project start date.
April 29, 2025
Page 6 of 7
Reference: Work Plan and Budget NGN-17: Corrective Action Plan Execution
7-Eleven Store No. 35508
712 South State Street, Clearfield, Utah
Facility ID 3000334, Release Site NGN

Precautions will be taken to allow groundwater to drain from excavated soils throughout the excavation and
loading process. Loaded trucks will not leave the Site until groundwater has been removed in order to avoid
the loss of impacted material while in transit to the ET Technologies SRS.
Task 2 – Reporting
Upon the completion of field activities and the receipt of all analytical results, Stantec will prepare a report
documenting UST removal and remedial activities. The report will include a summary of field activities, actual
volumes of materials removed and placed (backfill to accommodate excavated PIS volumes and agricultural
gypsum), soil and other material disposal documentation, confirmation sample results, and laboratory reports.
Task 3 – Reimbursement Services
Stantec’s services will include preparation of reimbursement claims on behalf of 7-Eleven. This task includes
assembling invoices paid by 7-Eleven, invoices for subcontracted services, details of charges, Stantec
invoices, proof of payment documentation, the DERR Standardized Invoice Form, and the DERR Request
for Payment Voucher Summary Worksheet.
Estimated Costs
The estimated costs for the scope of work described in this work plan are presented in Table 3. Non-
reimbursable costs, such as subcontractor markup, have been omitted from the cost breakdown. Spackman’s
subcontracted cost estimate is provided as Attachment A.
The costs presented in Table 3 represent Stantec’s estimate of likely charges to be incurred during the
implementation of the scope of work described above. Actual charges to the tasks and activities included in
the scope may vary from those presented in the estimate as activities and tasks require either more or less
effort than estimated. Stantec will contact the DERR project manager if there is significant diversion from the
estimated cost breakdown, or if additional authorization above the total estimated cost of this work plan is
required.

April 29, 2025
Page 7 of 7
Reference: Work Plan and Budget NGN-17: Corrective Action Plan Execution
7-Eleven Store No. 35508
712 South State Street, Clearfield, Utah
Facility ID 3000334, Release Site NGN
Should you have any questions or require any additional information, please contact Anna Skinner at
[phone].
Sincerely,
STANTEC CONSULTING SERVICES INC.
Anna Skinner
Project Manager
Certified Consultant #0271
Phone: [phone]
[e-mail]
Ally Auffermann PE
Environmental Engineer
Phone: [phone]
[e-mail]
Attachments: Figure 1 – Site Plan
Table 1 – MNA Analytical Results
Table 2 – Soil Analytical Results
Table 3 – Estimated Costs for WP&B NGN-16
Attachment 1 – Spackman Cost Estimate

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7-ELEVEN STORE
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1SITE PLANSTORE NO. 35508
712 SOUTH STATE STREET
CLEARFIELD, UTAH
FOR:
JOB NUMBER:DRAWN BY:CHECKED BY:APPROVED BY:DATE:
FIGURE:
No warranty is made by Stantec Consulting Services Inc. as to the accuracy, reliability, or completeness of these data. Original data were
compiled from various sources. This information may not meet National Map Accuracy Standards. This product was developed
electronically, and may be updated without notification. Any reproduction may result in a loss of scale and or information.
N 0 40 80
APPROXIMATE SCALE IN FEET
ELEVEN
PHONE:
2890 E COTTONWOOD PKWY, STE 300
SALT LAKE CITY, UTAH
[phone]
E
MW-1R
GW-1
SS-2
GW-2
SS-4
SS-5
SS-6
SS-7
SS-1/
USC-1
SS-3/
USC-2
SS-10/
USC-3
SS-9
SS-8
No warranty is made by Stantec Consulting Services Inc. as to the accuracy, reliability, or completeness of these data. Original data were
LEGEND
TELEPHONE LINE
ELECTRIC LINE
X X X X X
G G
T T
E E
MW-1
STORM DRAINSDSD
CS-1
SS-1 UST CLOSURE SAMPLE LOCATION
MONITORING WELL LOCATION
CONFIRMATION SAMPLE LOCATION
APPROXIMATE PROPERTY BOUNDARY
FENCE LINE
GAS LINE
APPROXIMATE UST
RESURFACING
BOUNDARY
APPROXIMATE
EXCAVATION
BOUNDARY

Tables
Sample
Location Date Sulfate Iron Methane
MW-1R 4/16/2025 7.15
T8 63.2 <0.100 <0.0100
MW-2R 4/17/2025 1.84
T8 31.1 6.84 0.544
MW-3R 4/17/2025 3.09
T8 46 <0.100 <0.0100
MW-4R 4/18/2025 2.47 45.2 0.111 0.0106
MW-5R 4/17/2025 <0.100
T8 <5.00 17.3 0.417
MW-6R 4/16/2025 5.76 65.9 0.359 <0.0100
MW-7R 4/17/2025 3.02
T8 47.4 <0.100 <0.0100
MW-8 4/17/2025 0.364
T8 18.8 0.237 0.0847
MW-9 4/18/2025 0.241 29.1 4.35 1.10
MW-10 4/16/2025 3.58
T8 44.4 <0.100 <0.0100
MW-11 4/17/2025 4.14
T8 45.9 <0.100 <0.0100
MW-12 4/16/2025 8.8
T8 62 <0.100 <0.0100
Notes:
All concentrations are in milligrams per liter (mg/L).
T8 = Sample(s) received too close to holding time expiration.
Table 1
MNA Analytical Results
7-Eleven Store No. 35508
712 South State Street, Clearfield, Utah
Nitrate
Page 1 of 1 Stantec Consulting Services Inc.
MW-1 7.0 08/03/15 <0.00189 0.00524 0.0130 0.00279 0.0168 <0.00473 0.280 <4.90
MW-1 14.0 08/03/15 <0.00188 0.00502 0.0117 <0.00188 0.0104 <0.00470 0.224 <4.87
MW-1R 17.5 10/05/16 <0.00189 0.00218 0.00308 <0.00189 <0.00567 <0.00473 <0.0945 <4.84
MW-2 11.0 08/03/15 <0.0975 0.678 4.99 1.33 10.9 <0.244 80.0 <4.87
MW-2 12.0 08/03/15 <0.0990 0.307 2.41 0.795 7.96 <0.248 52.1 <4.93
MW-2R 17.5 10/05/16 <0.00180 0.292 1.49 0.0659 0.564 <0.00450 3.65 <4.85
MW-2R 20.0 10/05/16 <0.00193 0.0172 0.129 0.0110 0.0922 <0.00484 0.503 <4.90
MW-3 12.5 08/03/15 <0.00188 0.0553 0.200 0.00338 0.192 <0.00469 0.638 <4.81
MW-3 14.0 08/03/15 <0.00195 0.0561 0.242 0.0213 0.200 <0.00486 1.06 <4.90
MW-3R 20.0 10/05/16 <0.00185 0.00285 0.00535 <0.00185 <0.00554 <0.00461 <0.0923 <4.98
MW-4 13.0 08/03/15 <0.00173 0.00533 0.0128 0.00199 0.0118 <0.00433 33.0 <4.96
MW-4 14.0 08/03/15 <0.00188 0.00655 0.0154 0.00367 0.0153 <0.00470 46.7 <4.71
MW-4R 19.0 10/05/16 <0.00196 0.00322 0.00524 <0.00196 <0.00588 <0.00490 <0.0980 <4.92
MW-5 12.0 12/08/15 <0.00168 0.0162 0.0655 0.00521 0.0450 <0.00419 0.310 <4.98
MW-5 15.0 12/08/15 <0.00188 0.00821 0.0578 0.0112 0.107 0.00618 0.843 <4.94
MW-5R 20.0 10/05/16 <0.00180 0.0295 0.0789 0.0125 0.0405 <0.00449 0.320 <4.93
MW-6 15.0 12/08/15 <0.00167 0.00336 0.00841 0.00167 0.00672 <0.00417 <0.0835 <4.94
MW-6 20.0 12/08/15 <0.00188 0.00461 0.0106 0.00198 0.00738 <0.00469 <0.0938 <4.92
MW-6R 18.0 10/04/16 <0.00189 0.00255 0.00395 <0.00189 <0.00566 <0.00472 <0.0943 <4.84
MW-7 10.0 12/08/15 <0.00182 0.00267 0.00688 <0.00182 <0.00547 <0.00456 <0.0912 <4.87
MW-7 15.0 12/08/15 <0.00185 0.00327 0.00757 <0.00185 0.00655 <0.00463 <0.0926 <4.96
MW-7R 17.5 10/04/16 <0.00190 <0.00190 <0.00190 <0.00190 <0.00569 <0.00474 <0.0949 <4.91
MW-8 11.0 10/04/16 <0.00196 <0.00196 0.00257 <0.00196 <0.00587 <0.00489 <0.0978 <4.91
MW-8 14.0 10/04/16 <0.00189 0.00226 0.00323 <0.00189 <0.00568 <0.00473 0.174 <4.93
MW-8 18.5 10/04/16 <0.00188 0.00271 0.00418 <0.00188 <0.00565 <0.00471 <0.0942 <4.86
MW-9 5.5 - 6.5 11/14/17 <0.00192 <0.00192 <0.00192 <0.00192 <0.00576 <0.00480 <0.0960 <4.83
MW-9 9 - 10 11/14/17 <0.00189 <0.00189 0.00212 <0.00189 <0.00566 <0.00472 <0.0956 <4.96
MW-9 13.0 - 13.5 11/14/17 <0.00194 0.00266 0.00434 <0.00194 <0.00581 <0.00484 <0.0859 <4.90
MW-9 18.5 - 19.0 11/14/17 <0.00184 0.00267 0.00534 <0.00184 <0.00551 <0.00460 <0.0942 <4.93
MW-10 10.3 08/29/19 <0.0101 <0.00504 <0.00504 <0.00504 <0.00504 <0.00504 <0.504 1.19
MW-10 20.0 08/29/19 <0.00990 <0.00495 <0.00495 <0.00495 <0.00495 <0.00495 <0.495 <0.993
MW-11 8.0 08/29/19 <0.0101 <0.00503 <0.00503 <0.00503 <0.00503 <0.00503 <0.477 <1.01
MW-11 20.0 08/29/19 <0.00998 <0.00499 <0.00499 <0.00499 <0.00499 <0.00499 <0.499 <0.995
MW-12 10.5 08/29/19 <0.00984 <0.00492 <0.00492 <0.00492 <0.00492 <0.00492 <0.492 <0.993
MW-12 20.0 08/29/19 <0.00967 <0.00484 <0.00484 <0.00484 <0.00484 <0.00484 <0.479 0.983
0.3 0.2 9 5 142 51 150 500
0.3 0.9 25 23 142 51 1,500 5,000
bgs
mg/Kg
MBTEXN
TPH-GRO
TPH-DRO
MTBE
<
--
UDEQ
RBCA
bold
= analyte not detected above the specified reporting limit
= not measured or analyzed
= Utah Department of Environmental Quality
= Risk-Based Corrective Action
= analytical result exceeds the specified UDEQ Initial Screening Level
= below ground surface
= milligrams per kilogram
= methyl tertiary butyl ether, benzene, toluene, ethylbenzene, total xylenes, and naphthalene by EPA Method 8260B
= gasoline-range total petroleum hydrocarbons by EPA Method 8260B
= diesel-range total petroleum hydrocarbons by EPA Method 8015D
= methyl tertiary butyl ether
Ethyl-
benzene
Total
Xylenes Naphthalene
UDEQ Initial Screening Level
RBCA Tier 1 Screening Level
Explanation of Abbreviations
Sample
Location
Depth
(feet bgs)
Date
Sampled
MBTEXN Compounds
TPH-GRO
(mg/Kg)
TPH-DRO
(mg/Kg)
(mg/Kg)
MTBE Benzene Toluene
Table 2
Soil Analytical Results
7-Eleven Store No. 35508
712 South State Street
Clearfield, Utah
Page 1 of 1 Stantec Consulting Services Inc.
PE, subcontractor procurement P102 4 hours @ $157.00 = $628.00
PE, DAQ and NDSD permitting P102 4 hours @ $157.00 = $628.00
Senior PM, soil waste profile application P101 2 hours @ $163.00 = $326.00
Senior PM, on site P101 4 hours @ $163.00 = $652.00
Field Scientist, on site P104 45 hours @ $109.00 = $4,905.00
Field Scientist, travel P104 9 hours @ $109.00 = $981.00
Subcontractor Bid 1 bid @ $106,300.00 = $106,300.00
Agricultural Gypsum 14 tons @ $83.71
= $1,171.94
Soil Disposal 1300 tons @ $25.07
= $32,591.00
Health and Safety Plan 1 NTE @ $470.00
= $470.00
PID 1 week @ $285.00
= $285.00
Sampling Supplies 1 week @ $100.00
= $100.00
MNA Laboratory Analyses 12 sample @ $198.00
= $2,376.00
Soil Waste Profile Laboratory Analyses 2 sample @ $182.00
= $364.00
Soil MBTEXN/GRO/DRO Analyses 13 sample @ $85.00
= $1,105.00
-- 24-hour rush turnaround 13 sample @ $85.00
= $1,105.00
Water MBTEXN/GRO/DRO Analyses 3 sample @ $85.00
= $255.00
-- 24-hour rush turnaround 3 sample @ $85.00
= $255.00
Senior PM, review P101 1 hour @ $163.00 = $163.00
PE, review P102 2 hour @ $157.00 = $314.00
PM, preparation P103 20 hours @ $127.00 = $2,540.00
Field Scientist, preparation P104 10 hours @ $109.00 = $1,090.00
Drafter P107 8 hours @ $90.00 = $720.00
Clerical P109 1 hours @ $66.00
= $66.00
Senior PM, review P102 3 hours @ $157.00 = $471.00
PST Specialist, preparation P108 8 hours @ $84.00 = $672.00
Task 3 Subtotal $1,143.00
Table 3
Corrective Action Plan Execution
7-Eleven Store No. 35508
712 South State Street, Clearfield, Utah
Facility ID 3000334, Release Site NGN
Total Budget $160,533.94
Estimated Costs for WP&B NGN-17
Task 2 - Reporting
Task 2 Subtotal $4,893.00
Task 1 - Remedial Excavation and Groundwater Treatment
Task 1 Subtotal $154,497.94
Task 3 - Reimbursement
• PST Fund Claim Preparation
Page 1 of 1 Stantec Consulting Services Inc.

Attachment
E S T I M A T E
Spackman Enterprises, L.C.
PO Box 1276
Centervi ll e, UT 84014
tspackman@spackmanenterprises.c
om
[phone]
65-352 Stantec (7 Eleven Stores)
Bill to
Stantec C onsulting Corporation
2890 E Cottonwood Pa rkwa y Suite 300
SLC , UT 84121
Ship to
Sta ntec Consulting Corp ora tion
3995 South 700 Ea st Suite 300
U tah
Murra y, UT 84107
Estimate details
Estim ate no.: 1125
Estim ate date: 02/28/2025
Job Site: 7-11 Clearfi eld Rem ediation
#Product or service Descrip tion Qty Rate Am ount
1.Excavation Cutting and Removal of up to 2500 sq feet
of asphalt
1 $1,750.00 $1,750.00
2.Excavation Excavatio n and Transpo rtation Only of 1300
tons of impacted soil
1300 $19.00 $24,700.00
3.Excavation Excavatio n and o nsite staging o f up to
1400 to ns or 933 CY o f clean overburden.
1 $6,300.00 $6,300.00
4.Excavation Backfill and compact with clean o verburden
up to 1400 tons or 933 CY, excludes any
testing due to material inconsistency
1 $6,300.00 $6,300.00
5.Excavation Unit co st for dispo sal o f unusable
overburden, 20.00 per to n if it is accepted
by co nro ck recycling as clean fill.
1 $0.00 $0.00
6.Excavation Additio nal backfill and compaction to
replace impacted so il volume 1300 tons.
1300 $35.00 $45,500.00
7.Excavation Additio nal asphalt resurfacing 3"thick up to
2500 sq feet
2500 $3.50 $8,750.00
8.Excavation Dug in dewatering sump at time of
excavatio n
1 $1,000.00 $1,000.00
9.Excavation Daily dewatering pump rate for a manned
2" trash pump. **up to 8 hours daily**
excludes weekend, overnight, o r overtime
4 $900.00 $3,600.00
pumping. **3 days to pump while digging,
1 day to discharge frac tank.
10.Excavation Price per Frac Tank to
Mobe/Demobe/Clean and Sediment
removal/disposal (if clean sediment, if
co ntaminated will take it to ET like the o ther
so il. )
1 $3,200.00 $3,200.00
11.Excavation Frac Tank per day 14 $50.00 $700.00
12.Excavation Cost fo r one pot filter, two carbon drums,
set up and take do wn. Assumes being
gravity fed ** excludes any mo nitoring or
testing o r additio nal carbo n o r drums if
needed** $5,500.00
1 $0.00 $0.00
13.Excavation Air sparging with a blower o r compresso r
would be 800.00 per
8 ho ur day. U nmonito red. Rate includes
fueling generator or co mpresso r daily.
5 $800.00 $4,000.00
14.Excavation Additio nal 15 days of fence 1 $500.00 $500.00
15.Excavatio n should take 3 days, backfill 4
days, resurfacing 1 day.
16.** Excludes any shoring, utility repair,
co ncrete repair, or remobilization. Priced
based on being able to excavate as soo n
as removal is complete and backfill as
so o n as excavation is complete.
Total $106,300.00
Accepted date A ccepted by