DERR-2024-006651

Underwood Environmental Consulting, Inc.
9475 N. Silver Creek Road  Park City, Utah 84098  Phone [phone]  Fax [phone]

INITIAL SUBSURFACE INVESTIGATION REPORT
RELEASE OIV

April 5, 2024

K & C Trading Post (Sinclair)
161 East Main Street
Bluff, Utah
Facility ID #5000084, Release Site OIV

Submitted To:

Mr. Vance Nielson
JVP, Inc.
P.O. Box 27
Bluff, Utah 84512

Copy To:

Mr. Hong-Lei Tao
Department of Environmental Quality
Division of Environmental Response and Remediation
P.O. Box 144840
Salt Lake City, Utah 84114-4840

Initial Subsurface Investigation Report
K & C Trading Post (Sinclair)
161 East Main St., Bluff, UT
Facility ID #5000084, Release Site OIV

Underwood Environmental Consulting, Inc.
i
EXECUTIVE SUMMARY

Underwood Environmental Consulting, Inc. conducted a subsurface investigation for Mr. Vance Nielson
(JVP, Inc) owner of the K & C Trading Post. The project site, located at 161 East Main Street, Bluff,
Utah, is a retail fueling facility and convenience store. This subsurface investigation was conducted to
assess subsurface conditions following the reported release from a leaking underground storage tank
(UST). On September 18, 2023 a release was reported by the owner based on a failed automatic tank
gauging (ATG) test and confirmed by a certified tank tester. The fueling facility is the only operating
retail gas station in the town of Bluff. The release (OIV) is 100% eligible for Petroleum Storage Tank
(PST) Fund reimbursement.

This report summarizes the results of a subsurface investigation performed in February of 2024. Based
on field observations and the analytical results of soil and groundwater samples, the following
conclusions are presented:

• Five soil borings and four groundwater monitoring wells were installed across the site in
February 2024.

• The native soil types encountered beneath the surface included sand, clayey silts and sands,
clay, sand and gravely sands to the depth explored (25 feet). A four to five foot thick clay
zone below the 10 foot depth was underlain by sand and gravelly sand.

• Groundwater was observed at approximately 18.58 to 19.99 feet below top-of-casing
(TOC) in the four newly installed monitoring wells. The groundwater flow direction was
determined to be southwest. The groundwater gradient was estimated at 0.001 ft/ft.

• Soil samples collected from two boring locations (MW-1 and MW-3) exceeded Tier 1
screening levels for petroleum constituents.

• Groundwater samples were collected from the developed monitoring wells. One well
(MW-3) contained 0.65 ft of gasoline. Well MW-1 exceeded Tier 1 for Benzene and
Toluene while MW-2 and MW-4 exceeded ISL’s for Benzene.

• Two artesian wells are located on site. One is currently in use while the other is temporally
shut off at the well head.

• Additional subsurface investigation is necessary to delineate the extents of impacts.

Based on the findings presented above, UEC recommends additional investigation and monitoring well
installation followed by a high vacuum extraction event to remove free product (gasoline) from the
groundwater.
Initial Subsurface Investigation Report
K & C Trading Post (Sinclair)
161 East Main St., Bluff, UT
Facility ID #5000084, Release Site OIV

Underwood Environmental Consulting, Inc.
ii

Respectfully,
Underwood Environmental Consulting, Inc.

L. Earl Underwood, P.G.
Project Geologist
UST Certified Consultant - CC0018
Initial Subsurface Investigation Report
K & C Trading Post (Sinclair)
161 East Main St., Bluff, UT
Facility ID #5000084, Release Site OIV

Underwood Environmental Consulting, Inc.
iii
TABLE OF CONTENTS

1.0 INTRODUCTION ....................................................................................................................... 4
2.0 SITE DESCRIPTION .................................................................................................................. 4
3.0 TIER 1 CRITERIA ...................................................................................................................... 5
4.0 NATURE OF RELEASE AND ABATEMENT MEASURES ................................................... 5
5.0 METHODOLOGY ...................................................................................................................... 6
5.1 Soil Borings and Monitoring Well Installation .................................................................... 6
5.2 Soil Sampling ....................................................................................................................... 6
5.3 Groundwater Sampling ......................................................................................................... 7
6.0 RESULTS ................................................................................................................................... 7
6.1 Subsurface Lithology ............................................................................................................ 7
6.2 Field Screening ..................................................................................................................... 7
6.3 Soil Analytical Results ......................................................................................................... 7
6.4 Groundwater Flow Direction ................................................................................................ 8
6.5 Groundwater Analytical Results ........................................................................................... 8
6.6 Free Product .......................................................................................................................... 8
7.0 QUALITY ASSURANCE AND QUALITY CONTROL .......................................................... 8
8.0 CONCLUSIONS AND RECOMMENDATIONS ...................................................................... 9
9.0 LIMITATIONS............................................................................................................................ 9

APPENDICES

Appendix A Division of Water Rights
Appendix B Subsurface Logs
Appendix C Laboratory Analytical Reports and Chain of Custody Documentation
Appendix D Photo Documentation

LIST OF FIGURES

Figure 1 Site Area Map
Figure 1A Area Topo Map
Figure 2 Site Vicinity Map
Figure 3 Site Map
Figure 4 Groundwater Gradient Map (Feb 24, 2024)

LIST OF TABLES

Table 1 Soil Sample Analytical Results
Table 2 Groundwater Monitoring Data
Initial Subsurface Investigation Report
K & C Trading Post (Sinclair)
161 East Main St., Bluff, UT
Facility ID #5000084, Release Site OIV

Underwood Environmental Consulting, Inc.
4

1.0 INTRODUCTION

Underwood Environmental Consulting, Inc. (UEC) conducted a subsurface investigation for K and C Trading
Post (Sinclair) in Bluff, Utah on February 15-16th, 2024. The project site, a retail fueling station, convenience
store and hotel is located at 161 East Main Street, Bluff, Utah. The underground fueling system consisted of a
15,000-gallon fiberglass two-compartment gasoline underground storage tank (UST) connected to two
dispensers. In September 2023 the automatic tank gauging system indicated a leak in the 5,000-gallon premium
gasoline compartment. The facility owner contacted a tank tester who confirmed the leak. The tank was emptied
and a release was reported to the Utah Division of Environmental Response and Remediation (DERR). A new
replacement UST was ordered while the 10,000-gallon regular unleaded gasoline tank compartment remained in
service. The 10,000 gallon unleaded tank compartment had passed the tank tightness test.

The subsurface investigation was conducted under approved work plan OIV-01. The site is 100% eligible for
Petroleum Storage Tank (PST) Fund reimbursement. The DERR identifies the project site as Facility ID
#5000084, Release Site OIV. This report summarizes the results of a subsurface investigation performed on
February 15-16, 2024.

2.0 SITE DESCRIPTION

The project site is located on the south side of Main Street (Hwy 191) in the town of Bluff east of Cottonwood
Wash and north of the San Juan River (Figure 1). Commercial businesses are located across Main Street to the
north and a hotel is located on the adjacent property to the west. The site includes a retail gasoline fueling station
(Sinclair), a convenience store (K & C store) and a hotel (Kokopelli Inn).

The fueling system consist of a two-compartment fiberglass UST containing a 10,000 gallon unleaded gasoline
compartment and a 5,000 gallon premium gasoline compartment. The UST is connected to two fueling dispensers
under a canopy structure. A 2,000-gallon diesel aboveground storage tank (AST) is located southeast of the UST
system.

Groundcover consists of asphalt pavement, concrete, gravel, and landscaping. Utilities border the site to the north
along Main Street (water, phone/communications and overhead power). Culinary (City) water connects from
the water main to the Kokopelli Hotel and to the Store. There are no public sewer or natural gas services in the
town of Bluff. A septic system and propane tank are located south of the store and hotel. The project site is
essentially flat and slopes gently to the south and is at an elevation of approximately 4,324 feet above mean sea
level.

Two artesian wells are located on site under water rights number 09-196. Well #1 is located north of the Kokopelli
Inn hotel and Well #2 is located east of the K & C Store near the adjacent Recapture Inn (Figure 3). The wells
were apparently installed in the 1950s and improved in the 1980s. Well #1 is 8-inch diameter and 700 feet deep
and Well #2 is 6-inch diameter and 590 feet deep. In 1981 Well #1 was cased to 63 feet and in 1980 Well #2 was
cased to 60 feet according to drillers reports (Appendix A).

Initial Subsurface Investigation Report
K & C Trading Post (Sinclair)
161 East Main St., Bluff, UT
Facility ID #5000084, Release Site OIV

Underwood Environmental Consulting, Inc.
5

3.0 TIER 1 CRITERIA

Tier 1 Criteria describes the environmental features and possible risks to human health or the environment. The
following site specific information is provided:

The current land use is commercial. The surrounding properties are commercial (Figure 2).

The native soil types encountered during soil borings and installation of monitoring wells included sand, clayey
silts and sands, clay, sand and gravely sands to the depth explored (25 feet). The subsurface logs are attached in
Appendix B.

Groundwater was observed at approximately 18.58 to 19.99 feet below top-of-casing (TOC) in the four newly
installed monitoring wells. The groundwater flow direction was determined to be southwest. The groundwater
gradient was estimated at 0.001 ft/ft (Figure 4).

Distance of petroleum contamination to the nearest underground utility: Underground utilities servicing the site
structures enter from the north (water). The facility uses aboveground propane so there is no buried natural gas
line entering the site. There is no public sewer system connected to the site which uses septic systems south of
the store and hotel. Monitoring well MW-3 is located approximately 50 feet south of the water main located
south of Main Street. The UST is located about 25 feet from the water main.

Distance of petroleum contamination to the nearest property line and building: Monitoring well MW-4 is located
approximately 10 feet from the store. MW-3 is located approximately 50 feet from the store and 50 feet from the
north property line. The distance from the UST to the north property line (highway 191 right of way) is about 25
feet.

A Utah Division of Water Rights (DWR) point-of-diversion plot indicates several points of diversion in the
vicinity of the subject site. Two artesian wells are located on the site (Figure 3). The wells are listed under water
rights number 09-196 and designated as well #1 (west side of property) and well #2 (east side of the property).
Well #1 is about 112 feet from MW-3 (free product well) and well #2 is about 110 feet from MW-1. Water rights
maps, drillers reports and related documents are attached in Appendix A.

4.0 NATURE OF RELEASE AND ABATEMENT MEASURES

Release OIV was opened based upon a failed ATG test and confirmed by a tank tightness test. In September 2023
the premium gasoline tank compartment’s ATG system indicated a loss of fuel. The facility owner promptly
notified his tank tester. The release was confirmed by a tightness test and the tank compartment was immediately
emptied by the fuel distributor. The tank tester then retested the emptied tank compartment and reported that
water was apparently entering the tank when a vacuum was applied. The tank tester further indicated the leak
was slow and likely in the bottom portion of the tank. The regular unleaded tank compartment was also tested
and no leak was detected. Inventory records initially suggested a loss of less than 500 gallons of fuel. The facility
owner subsequently placed an order to purchase a replacement tank. Plans were formulated to remove the existing
2-compartment single walled fiberglass UST immediately prior to delivery of a new double walled UST of the
Initial Subsurface Investigation Report
K & C Trading Post (Sinclair)
161 East Main St., Bluff, UT
Facility ID #5000084, Release Site OIV

Underwood Environmental Consulting, Inc.
6
same capacity and configuration. The K & C Sinclair station is the only operating retail gas station in the town
of Bluff and every effort was made to minimize the down time and get a new fuel system installed and operational.

The existing UST was removed on March 6th, 2024 and an abatement was immediately performed in which
impacted soils and backfill material were excavated. Details of abatement activities are presented in the pending
Abatement Report. A new UST was delivered on March 13th, 2024 and installation of the fueling system
commenced.

5.0 METHODOLOGY

5.1 SOIL BORINGS AND MONITORING WELL INSTALLATION

Five soil borings were installed and four were converted to 2-inch diameter groundwater monitoring wells (MW-
1 through MW-4) on February 15-16th, 2024 at the project site (Figure 3). Direct push drilling methods were
used for boring and well installation. Monitoring well locations were based on data from historical records of
nearby leaking UST projects and other geological parameters. Research from prior subsurface investigations
suggested a groundwater flow direction to the southwest.

Borings for monitoring wells were targeted for a depth of 25 feet. The larger 3.5-inch diameter tooling was used
to accommodate 2-inch wells and collect continuous core samples to the depth of each boring. Wells were set at
depths ranging from approximately 23 – 25 feet below top of casing. Soil only boring SB-1 was intended for
waste characterization and placed as near to the leaking tank as feasible. Static water level measured in wells
ranged from 18.58 to 19.99 feet below top of casing. The wells were screened across the water table, developed
and surveyed by differential leveling to establish vertical control. The monitoring well construction details are
depicted on the subsurface logs provided in Appendix B.

5.2 SOIL SAMPLING

All five boring/well locations were “daylighted” using water-knife soil vacuum techniques to five feet below
grade prior to drilling. Soil samples were collected in a continuous fashion to the total depth of each boring as
drilling progressed. Multiple soil samples were collected from each boring and retained in laboratory-supplied
glass jars, labeled appropriately, and placed on ice. The soil samples were analyzed by Chemtech-Ford
Laboratories for methyl tertiary-butyl ether (MTBE), benzene, toluene, ethylbenzene, xylenes, naphthalene
(BTEXN), total petroleum hydrocarbons – gasoline range organics (TPH-GRO), and TPH – diesel range organics
(TPH-DRO) using EPA methods 8260B and 8015C. The composite sample from SB-1 @ 18-20 feet was
analyzed for BTEXN/DRO/GRO, Total Lead, Flashpoint and pH. Chain of custody documentation was
maintained for all samples from the time of collection until delivered to the laboratory.

Field screening of soil sample intervals was conducted by headspace analysis using a photo-ionization detector
(PID). The samples were field screened using a Mini RAE 3000 PID. The exploratory borings were logged in
the field by a UEC professional geologist using the unified soil classification (USC) system.

Initial Subsurface Investigation Report
K & C Trading Post (Sinclair)
161 East Main St., Bluff, UT
Facility ID #5000084, Release Site OIV

Underwood Environmental Consulting, Inc.
7

5.3 GROUNDWATER SAMPLING

On February 24th, 2024 water levels were measured in the four new monitoring wells using an electronic water
level indicator. Three of the four new wells were subsequently purged of three casing volumes of water prior to
sampling. Well MW-3 contained 0.65 feet of free product and was therefore not sampled. A separate disposable
bailer was utilized for sample collection at each well. The groundwater samples were labeled appropriately,
placed on ice, and submitted to the laboratory under chain-of-custody. The groundwater samples were analyzed
for MTBE, BTEXN, TPH-GRO, and TPH-DRO using EPA methods 8260B and 8015C. During the groundwater
sampling event the east artesian well (Well #2) was also sampled at the hydrant near the store and included in the
same sample set.

6.0 RESULTS

6.1 SUBSURFACE LITHOLOGY

The upper five feet of soil was daylighted. These upper soils appeared to be primarily silty/sandy clay with some
coarse gravel. Soils below five feet were logged and consisted of fine sand and silty sand interbedded with silt
and sandy silt. A clay zone four to five thick was contacted in each boring below the ten-foot level. The clay
was wet and soft in the upper portion, stiff in the center and soft in the lower portion. The clay became stiff at
about 13-14 feet. Below the clay at the 15-foot level a clean fine – medium sand was contacted which coarsened
downwards. The sand became wet at 19-20 feet. Wet gravelly sands were observed below 20 feet. Apparent
hydrocarbon odor was observed at the 10-12 foot level and the 20 foot level in select borings. Very little staining
was observed in any borings. Subsurface lithology was consistent with fluvial or stream deposits as expected
given the proximity of the San Juan River and Cottonwood Wash (Figure 1). The subsurface logs are provided
as an attachment in Appendix B.

6.2 FIELD SCREENING

Field screening of soil was conducted at variable intervals at each boring location using a PID. The results of
field screening are presented on the subsurface logs attached in Appendix B. The field screening generally
suggested that hydrocarbon impacts were greatest in soil at the 10-12 foot depth and near the water table interface
at 19-20 feet.

6.3 SOIL ANALYTICAL RESULTS

Four to five soil samples were submitted for laboratory analysis from each monitoring well boring. The results
of soil sample analysis from this subsurface investigation are presented on Table 1. The analytical results
presented on Table 1 are compared with Initial Screening Levels (ISLs) and Tier 1 Screening Criteria (Tier 1
levels) (DERR, 2005).

Initial Subsurface Investigation Report
K & C Trading Post (Sinclair)
161 East Main St., Bluff, UT
Facility ID #5000084, Release Site OIV

Underwood Environmental Consulting, Inc.
8
Of the five drill holes sampled, hydrocarbon concentrations exceeding Tier 1 criteria were detected in two
locations (MW-1 and MW-3). The depths of hydrocarbon impacts were generally in the 10-12 foot interval and
above the water table at 19-20 feet. Monitoring well boring MW-3 @ 10-12 feet contained the highest
concentration of Benzene (1.94 mg/kg). Boring MW-1 contained benzene at 1.81 mg/kg as well as toluene and
ethyl-benzene concentrations exceeding Tier 1 levels.

The extent of petroleum hydrocarbon impacts in soil are not fully defined in the north, east and west directions.
The laboratory analytical reports and chain-of-custody documentation are provided in Appendix C.

6.4 GROUNDWATER FLOW DIRECTION

On February 24, 2024 the depth to groundwater ranged from approximately 18.58 to 19.99 feet below top-of-
casing (TOC) in the five newly installed monitoring wells (Table 2). Figure 4 depicts a groundwater contour
map for the project site on February 24, 2024. Based on the calculated groundwater elevations, the groundwater
flow direction is to the southeast. The gradient across the study area was approximately 0.001 ft/ft.

6.5 GROUNDWATER ANALYTICAL RESULTS

Three of the four monitoring wells were purged and sampled on February 24, 2024. Well MW-3 contained free
product and was not sampled. A summary of groundwater monitoring data is presented on Table 2. The analytical
results presented on Table 2 are compared with ISLs and Tier 1 levels (DERR, 2005). All three wells sampled
(MW-1, MW-2 and MW-4) exceeded the ISLs for benzene. MW-1 exceeded Tier 1 for benzene and toluene and
exceeded ISLs for TPH/GRO (8.47 mg/L). The extents of petroleum hydrocarbon impacts in groundwater are
not defined to ISL or Tier 1 concentrations. The laboratory analytical reports and chain-of-custody documentation
are provided in the Appendix C. The water sampled collected from the hydrant connected to Well #2 (artesian)
was non-detect for petroleum constituents analyzed.

6.6 FREE PRODUCT

Free product was observed in monitoring well MW-3 at a thickness of 0.65 feet.

7.0 QUALITY ASSURANCE AND QUALITY CONTROL

Soil and groundwater samples collected during subsurface investigation were collected by a State-certified soil
and groundwater sampler under the supervision of a State-certified UST Consultant. Proper sampling protocol,
utilizing industry recognized standards, was followed during the investigation. Samples were retained in
laboratory-supplied containers (4 oz. glass jars or 40 ml vials) and placed on ice until relinquished to the
laboratory. Chain of custody records were maintained and are attached along with the complete laboratory
analytical reports in Appendix C. The analytical laboratory utilized is certified by the State for the analyses
performed and has quality assurance / quality control procedures in place to ensure the accuracy of the analytical
data provided.
Initial Subsurface Investigation Report
K & C Trading Post (Sinclair)
161 East Main St., Bluff, UT
Facility ID #5000084, Release Site OIV

Underwood Environmental Consulting, Inc.
9

8.0 CONCLUSIONS AND RECOMMENDATIONS

Based on field observations and the analytical results of soil and groundwater samples obtained during subsurface
investigation, the following conclusions are presented:

• Five soil borings and four groundwater monitoring wells were installed across the site in February
2024.

• The native soil types encountered beneath the surface included sand, clayey silts and sands, clay,
sand and gravely sands to the depth explored (25 feet). A four to five foot thick clay zone below
the 10 foot depth was underlain by sand and gravelly sand.

• Groundwater was observed at approximately 18.58 to 19.99 feet below top-of-casing (TOC) in the
four newly installed monitoring wells. The groundwater flow direction was determined to be
southwest. The groundwater gradient was estimated at 0.001 ft/ft.

• Groundwater samples were collected from three developed monitoring wells. One well (MW-3)
contained 0.65 ft of gasoline. Well MW-1 exceeded Tier 1 for Benzene and Toluene while MW-2
and MW-4 exceeded ISL’s for Benzene.

• Two artesian wells are located on site. One is currently in use while the other is temporally shut off
at the well head.

• Additional subsurface investigation is necessary to delineate the extent of impacts to soil and
groundwater.

Based on the findings presented above, UEC recommends additional investigation and monitoring well
installation followed by a high vacuum extraction event to remove free product (gasoline) from the groundwater.

9.0 LIMITATIONS

Our services consist of professional opinions from a State-Certified UST Consultant, made in general accordance
with locally accepted environmental practices at the time of execution. Environmental samples are obtained from
specific locations, utilizing methodologies consistent with the Utah Department of Environmental Quality
regulations. Even when field investigative work is performed to an appropriate standard of care, certain site
conditions may present difficult assessment problems. Such conditions may include, but are not limited to,
complex geologic setting and materials, fate and transport character of petroleum hydrocarbons, physical
constraints, presence of utilities overhead and below ground, and the limitations of the assessment tools
employed. UEC makes no guarantee; either expressed or implied, that the analytical results accurately represent
subsurface conditions throughout the entire project site.
Subsurface Investigation Report
K and C Trading Post (Sinclair)
161 East Main St., Bluff, UT
Facility ID #5000084, Release Site OIV
Date Ethyl-Total Naphtha-TPH TPH
Sample Number Collected MTBE Benzene Toluene benzene Xylenes lene GRO DRO
(mg/kg)(mg/kg)(mg/kg)(mg/kg)(mg/kg)(mg/kg)(mg/kg)(mg/kg)
MW-1 @ 3-5 ft 2/16/2024 <0.01 <0.01 0.05 <0.03 0.18 <0.03 <0.283 <59
MW-1 @ 11-12 ft 2/16/2024 <0.01 1.81 15.1 5.19 20.2 0.42 102 99
MW-1 @ 13-15 ft 2/16/2024 <0.12 0.05 0.81 0.39 1.59 0.08 10 <63
MW-1 @ 17-19 ft 2/16/2024 <0.009 <0.009 <0.02 <0.02 0.03 0.02 0.237 <53
MW-2 @ 5-7 ft 2/15/2024 <0.01 <0.01 <0.03 <0.03 <0.03 <0.03 <0.235 <59
MW-2 @ 12-13 ft 2/15/2024 <0.009 <0.009 <0.02 <0.02 <0.02 <0.02 0.235 <65
MW-2 @ 18-19 ft 2/15/2024 <0.009 <0.009 <0.02 <0.02 <0.02 <0.02 <0.224 <54
MW-2 @ 21-22 ft 2/15/2024 <0.009 <0.009 <0.02 <0.02 <0.02 <0.02 <0.213 <61
MW-3 @ 5-7 ft 2/15/2024 <0.01 <0.01 <0.03 <0.03 <0.03 <0.03 0.28 <56
MW-3 @ 10-12 ft 2/15/2024 <0.01 1.94 2.47 1.48 6.33 0.13 21.6 <69
MW-3 @ 15-16 ft 2/15/2024 <0.009 <0.009 <0.02 <0.02 <0.02 <0.02 <0.236 <50
MW-3 @ 19-20 ft 2/15/2024 <0.13 0.74 4.65 0.55 2.30 <0.32 8.23 <65
MW-3 @ 20-21 ft 2/15/2024 <0.01 <0.01 0.15 0.06 0.26 <0.03 2.90 <59
MW-4 @ 5-7 ft 2/16/2024 <0.01 <0.01 <0.03 <0.03 <0.03 <0.03 <0.301 <61
MW-4 @ 10-12 ft 2/16/2024 <0.01 <0.01 <0.02 <0.02 <0.02 <0.02 <0.248 <67
MW-4 @ 19-20 ft 2/16/2024 <0.01 <0.01 <0.03 <0.03 <0.03 <0.03 <0.258 <55
MW-4 @ 22-23 ft 2/16/2024 <0.009 <0.009 <0.02 <0.02 <0.02 <0.02 <0.228 <57
SB-1 @ 18-20 ft 2/16/2024 <0.006 <0.006 0.04 0.01 0.06 0.01 0.327 <78
0.3 0.2 9 5 142 51 150 500
0.3 0.9 25 23 142 51 1,500 5,000
Notes:MTBE = Methyl Tertiary-Butyl Ether mg/kg = Milligrams per Kilogram
TPH-GRO =Total Petroleum Hydrocarbons - Gasoline Range Organics < Indicates below given detection limit
TPH-DRO =Total Petroleum Hydrocarbons - Diesel Range Organics (1) DERR, 2005
Bold values are above Initial Screening Levels Highlighted,bold , values are above Tier 1 Screening Criteria
TABLE 1
SOIL SAMPLE ANALYTICAL RESULTS
Tier 1 Screening Criteria (1)
Initial Screening Level (1)
Underwood Environmental Consulting, Inc.
Initial Subsurface Investigation Report
K and C Trading Post
161 East Main St., Bluff, UT
Facility ID 5000084, Release Site OIV
WELL/DATE DTW FPT
GW
Elev.MTBE Benzene Toluene
Ethyl-
benzene Xylenes
Naphth-
alene
TPH
(GRO)
TPH
(DRO)
ELEV.(feet)(feet)(feet)(mg/L)(mg/L)(mg/L)(mg/L)(mg/L)(mg/L)(mg/L)(mg/L)
MW-1 02/24/24 19.56 80.44 <0.005 0.627 3.58 0.491 1.73 0.027 8.47 <1.0
100.00
MW-2 02/24/24 19.17 80.36 <0.005 0.291 0.013 0.073 <0.012 <0.012 0.665 <1.0
99.53
MW-3 02/24/24 19.99 0.65 80.38
99.89
MW-4 02/24/24 18.58 80.34 <0.005 0.033 0.051 <0.012 0.022 <0.012 <0.125 <1.0
98.92
Initial Screening Levels (1)0.2 0.005 1 0.7 10 0.7 1 1
Tier 1 Screening Criteria (1)0.2 0.3 3 4 10 0.7 10 10
Notes:Arbitrary datum of 100.00 feet established on site.MTBE = Methyl Tertiary Butyl Ether
DTW = Depth to Water TPH (GRO) = Total Petroleum Hydrocarbons - Gasoline Range Organics
FPT = Free Product Thickness TPH (DRO) = Total Petroleum Hydrocarbons - Diesel Range Organics
GW Elev. = Groundwater Elevation < Indicates below given detection limit.
GW Elev. Correction = (Well Elev.-DTW)+(0.75*FPT).Bold values are above Initial Screening Levels.
(1) DERR, 2005 Highlighted,bold , values are above Tier 1 Screening Criteria.
TABLE 2
GROUNDWATER MONITORING DATA
Not Sampled due to Free Product
Underwood Environmental Consulting, Inc.
K & C Trading Post (Sinclair)
161 E Main Street
Bluff, Utah
Facility ID # 5000084
Release Site OIV
FIGURE 1SITE AREA MAP
SITE
Cottonwood Wash
San Juan River
34
0
0

f
t
K & C Trading Post (Sinclair)
161 E Main Street
Bluff, Utah
Facility ID # 5000084
Release Site OIV Figure 1A
AREA TOPO MAP
SITE
UST System
K & C Trading Post
161 East Main Street
Bluff, Utah
Facility ID 5000084
Release OIVN
FIGURE 2Site Vicinity Map
LEGEND
approx. scale in feet
one inch ~ 30 feet
00 3015
K & C Trading Post (Sinclair)
161 E Main Street
Bluff, Utah
Facility ID # 5000084
Release Site OIV
NORTH
Overhead Power
Artesian Well
Landscape
Gravel
Gravel
Asphalt
Asphalt
Asphalt
Asphalt
W W W W WW W W W W W WWWW
C C C
C
C
C C
C
C C CCCCCC
w w wSDSDSDSDW
W
W
?
?
?
Well #1 Well #2
Diesel AST
K & C Store
Canopy
Concrete Pad
Dispensers
15,000 gal UST
U/L Prem
Sign Sign
Hotel
Recapture
Lodge
P
Water Line / MeterW
(Utility Locations Approximate)
Underground Power
Storm Drain
CommunicationsC
2-in Monitoring Well
Soil Boring
FIGURE 3
SITE MAP
MW-1
MW-2
SB-1
MW-3
MW-4
SD
Former UST
HWY 191
LEGEND
approx. scale in feet
one inch ~ 30 feet
00 3015
K & C Trading Post (Sinclair)
161 E Main Street
Bluff, Utah
Facility ID # 5000084
Release Site OIV
NORTH
Overhead Power
Artesian Well
Landscape
Gravel
Gravel
Asphalt
Asphalt Asphalt
W W W W WW W W W W W WWWW
W
W
W
C C C
C
C
C C C C
C
CCCCCC
w w wSDSDSDSD?
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Well #1 Well #2
Diesel AST
K & C Store
Canopy
Concrete Pad
Dispensers
15,000 gal UST
U/LPrem
Sign Sign
Hotel
Recapture
Lodge
P
Water Line / MeterW
(Utility Locations Approximate)
Underground Power
SD Storm Drain
CommunicationsC
2-in Monitoring Well FIGURE 4
Underground Utilities
MW-1
MW-2
MW-3
MW-4
Soil Boring
SB-1
Former UST
HWY 191
80
.
3
5
8
0
.
3
7
8
0
.
3
9
80
.
4
1
80
.
4
3
80.44
80.36
80.34
(0.65 ft FP)
80.38
GROUNDWATER GRADIENT MAP
FEB 24, 2024
Groundwater
Contour with
Flow Direction
(Relative Elev. in ft)