DERR-2024-010264

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

Mr. Craig Larson July 26, 2024
Wind River Petroleum Project No.: 1241-004D
5097 South 900 East
Salt Lake City, Utah 84117

SUBJECT: Groundwater Monitoring Report
Vernal Top Stop
1355 East Highway 40
Vernal, Utah
Release Site: EFDL
Facility I.D.: 9000221

In accordance with the approved Corrective Action Plan, Wasatch Environmental, Inc., (Wasatch) has
prepared the following Groundwater Monitoring Report for sampling activities conducted in May 2024 at
the Top Stop facility in Vernal, Utah.

The groundwater monitoring event was conducted by Wasatch Senior Field Geologist, Jake Scott P.G.,
on May 9 and 10, 2024.

FIELD MEASUREMENTS

Depth to groundwater measurements were performed using an electronic oil/water interface probe.
Depth to water was measured in monitoring wells MW-2, MW-3, MW-4, MW-5, MW-6, MW-12, MW-13,
MW-14, and MW-15. The probe was decontaminated between wells with an Alconox® wash and distilled
water rinse. Groundwater and top of free-product elevations were referenced to a 100-foot datum at well
MW-2. Summaries of current and previous field measurements are presented in Table 1.

No measurable accumulations of free-product were encountered during the May 2024 groundwater
monitoring event.

The groundwater elevation data were utilized to construct a potentiometric surface map presented as
Figure 3. When measurable accumulations of free-product are encountered, depth to groundwater and
groundwater elevations are corrected for the wells exhibiting measurable free-product. The
potentiometric map indicates that the direction of groundwater flow is generally to the southeast. The
average hydraulic gradient; calculated as a three-point problem using monitoring wells MW-5, MW-12,
and MW-15; was approximately 0.024 feet/foot. The average potentiometric surface increased by
approximately 0.43 feet since the November 2023 groundwater monitoring event.

GROUNDWATER SAMPLING METHODS

Groundwater samples were collected from monitoring wells MW-3, MW-5, MW-13, and MW-14 after
purging the wells of a minimum of three well bore volumes using a new disposable bailer and allowing the
wells to recharge. Monitoring wells MW-6, MW-12, and MW-15 were bailed dry, and were allowed to
recharge to a minimum of 90% of their initial water level before they were sampled using a new
disposable bailer. Monitoring well locations are shown on Figure 2.

Groundwater samples from each of the monitoring wells were collected and dispensed into four
preserved, 40-milliliter, glass vials equipped with Teflon® septa caps. The vials, which were supplied by
the analytical laboratory, contained several drops of hydrochloric acid as a preservative. The vials were
filled slowly until a meniscus formed at the top of each vial, then each vial was sealed with a septa cap.

Wasatch Environmental, Inc.
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This procedure eliminates headspace within the vials and minimizes the loss of volatiles. The sample
vials were each labeled with the analysis required, samplers name, sample identification, sample location,
date, and time of sample collection. The samples were placed in a cooler with ice and transported under
chain-of-custody protocol to Chemtech-Ford (CTF), a Utah-certified laboratory, for analysis. All purge
water generated during the groundwater monitoring activities was poured over the pavement near the
monitoring well locations.

No measurable free-product was detected on the influent or the effluent side of the oil/water separator. A
water sample was collected from the effluent side of the oil/water separator and submitted to CTF for
analysis.

GROUNDWATER SAMPLING ANALYTICAL RESULTS

The groundwater samples collected from the monitoring wells and the oil/water separator were
transported under chain-of-custody to CTF for analysis of methyl tertiary-butyl ether (MTBE), benzene,
toluene, ethylbenzene, total xylenes, naphthalene (MBTEXN), total petroleum hydrocarbons as gasoline -
range organics (TPH-GRO) using United States Environmental Protection Agency (U.S. EPA) method
8260D, and total petroleum hydrocarbons as diesel-range organics (TPH-DRO) using U.S. EPA Method
8015C. The laboratory analytical report and chain-of-custody documentation are attached in Appendix A.
Analytical results are summarized in Table 2. Analytical results for all monitoring locations, except for
monitoring well MW-6, have been compared to Interim Cleanup Levels (ICLs) that have been established
for the site. Because monitoring well MW-6 is located at the eastern property boundary, analytical results
for this well have been compared to Utah Initial Screening Levels (ISLs).

Benzene concentrations that exceed ed the ICL of 0.005 milligrams per liter (mg/L) were detected in
groundwater samples collected from monitoring wells MW-12 (0.165 mg/L), MW-13 (0.054 mg/L), MW-14
(0.834 mg/L), and MW-15 (0.034 mg/L). When compared to historical benzene concentrations, since the
horizontal trench soil vapor extraction (HT SVE) / density-driven convection (DDC) system was shut down
in December 2004, benzene concentrations in groundwater appear to be stable to slowly decreasing.
Benzene concentrations in groundwater are depicted in Figure 4.

No groundwater samples contained TPH-GRO at concentrations exceeding the ICL or Utah ISL for TPH-
GRO. TPH-GRO concentrations in the monitoring wells at this site have generally been stable to slowly
decreasing since December 2004.

TPH-DRO exceeded the Utah ISL of 1 mg/L in the groundwater sample collected from MW-6 (22.8 mg/L)
and exceeded the ICL of 10 mg/L in the groundwater sample collected from monitoring well MW-13 (123
mg/L). No other groundwater samples contained TPH-DRO at concentrations exceeding the ICL for TPH-
DRO. TPH-DRO concentrations at the site appear to be generally stable to slowly decreasing. TPH-
DRO concentrations in groundwater are depicted in Figure 5.

The laboratory analytical results revealed that none of the groundwater samples collected from any of the
monitoring wells contained toluene, ethylbenzene, total xylenes, naphthalene, or MTBE at concentrations
above their applicable ICLs or Utah ISLs.

The sample collected from the oil/water separator effluent exhibited a TPH-DRO concentration of 10.0
mg/L, which meets the ICL for TPH-DRO of 10 mg/L. No other analytes were detected in this sample at
concentrations above their applicable ICLs.

FREE-PRODUCT ABATEMENT

On May 9 and 10, 2024, prior to collecting groundwater samples, Wasatch checked for free-product and
the condition of the absorbent socks in monitoring wells MW-2, MW-4, MW-13, and MW-14.

Wasatch Environmental, Inc.
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The groundwater in monitoring well MW-2 exhibited a petroleum hydrocarbon odor. The absorbent sock
in monitoring well MW-2 was 100% saturated with free-product. The absorbent sock from monitoring well
MW-2 was discarded, and a new absorbent sock was deployed after the sampling was completed. The
groundwater in monitoring well MW-4 exhibited a petroleum hydrocarbon odor. The absorbent sock in
monitoring well MW-4 was 50% saturated with free-product. The absorbent sock in monitoring well MW-4
was inverted and redeployed after the sampling was completed. The groundwater in monitoring well MW-
13 exhibited a strong petroleum hydrocarbon odor and an oily sheen. The absorbent sock was 20%
saturated with free-product. The absorbent sock in monitoring well MW-13 was inverted and redeployed
after the sampling was completed. The groundwater in monitoring well MW-14 exhibited a petroleum
hydrocarbon odor and an oily sheen. The absorbent sock was 20% saturated with free-product. The
absorbent sock in monitoring well MW-14 was inverted and redeployed after the sampling was
completed.

OIL/WATER SEPARATOR OPERATION AND MAINTENANCE

The oil/water separator was cleaned out using a vacuum truck on November 2, 2023. The next service
event is scheduled for November of 2024.

Summary of Oil/Water Separator Service

Date of Service Inspected? Cleaned? Volume of Fluid Removed
July 2008 Yes No None
November 2008 Yes Yes 450 gallons of sludge and water
May 2013 Yes No None
October 2013 Yes Yes ~200 gallons of sludge, ~100 gallons of free-product
December 2014 Yes Yes ~1,000 gallons of sludge and water
November 2015 Yes Yes ~850 gallons of sludge and water, ~2 gallons of free-product
November 2016 Yes Yes ~880 gallons of sludge and water
November 2017 Yes Yes ~1,290 gallons of sludge and water
November 2018 Yes Yes ~1,560 gallons of sludge and water
November 2019 Yes Yes ~1,470 gallons of sludge and water
November 2020 Yes Yes ~1,470 gallons of sludge and water
November 2021 Yes Yes ~925 gallons of sludge and water
November 2022 Yes Yes ~900 gallons of sludge and water
November 2023 Yes Yes ~800 gallons of sludge and water

RECOMMENDATIONS

The oil/water separator should continue to be periodically cleaned out using a vacuum truck, and the
waste properly disposed. Cleaning with a vacuum truck should be performed annually.

As free-product remains at the site, and appears to be highly weathered, the free-product is not likely to
be remediated by either DDC or HTSVE and may be spread around the site by running the DDC system.
Restarting the remediation systems at this time would not be advisable.

Free-product removal efforts will continue using absorbent socks in affected monitoring wells, with semi-
annual sock monitoring by Wasatch personnel. In addition, if appreciable amounts of free-product are
encountered during sampling events, the free-product will be pumped or bailed out and disposed
appropriately.

The next groundwater monitoring event is scheduled for November 2024. At the request of the Division
of Environmental Response and Remediation (DERR), Wasatch is currently scoping additional
subsurface investigation work to support risk-based closure of the release.

Wasatch Environmental, Inc.
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Our services consist of professional opinions and recommendations made in accordance with generally
accepted environmental engineering principles and practices. This warranty is in lieu of all other
warranties either expressed or implied.

Should you have any questions, please do not hesitate to contact us.

Sincerely,

WASATCH ENVIRONMENTAL, INC.

Jake Scott, P.G. Michael S. Cronin, P.G
Senior Field Geologist Senior Project Geologist/Senior Project Manager

FIGURES

Figure 1 – DDC/HTSVE System Layout
Figure 2 – Site Map
Figure 3 – Potentiometric Surface Map
Figure 4 – Benzene Concentrations in Groundwater
Figure 5 – TPH-DRO Concentrations in Groundwater

TABLES

Table 1 – Summary of Monitoring Well Construction and Field Measurements
Table 2 – Summary of Groundwater Chemical Analysis

APPENDIX

Appendix A – Laboratory Analytical Results

Copies: (1) Addressee
(1) Craig Larson, Wind River Petroleum
(1) Eileen Brennan, DERR

Figures

FIGURE 1DATE: 12/19/2018PROJECT NO.: 1241-004DEnvironmental Science and Engineering
H
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4
0
500 South
Diesel
Dispensers
Top
Stop
Canopy &
Gasoline
Dispensers
Propane
AST
MW-3Fuel
ASTs
Pro
d
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L
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DDC/HTSVE SYSTEM LAYOUT
Top Stop C40
Vernal, Utah
MW-6
MW-7
(not found)
MW-5MW-4
MW-13
MW-2
MW-12
MW-1
MW-15
Drain
Sump
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Gas Line
Sewer Line
Manhole
Scale: 1” equals
approximately 50’
Monitoring Well Location
Sew
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Lin
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HTSVE Air Emissions Stack
Equipment Shed
DDC/HTSVE Trunk Lines
MW-14
DDC Well Location
DDC Line and Screen Location
DDC Valve Location
FIGURE 2DATE: 12/19/2018PROJECT NO.: 1241-004DEnvironmental Science and Engineering
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500 South
Diesel
Dispensers
Top
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Canopy &
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Dispensers
Propane
AST
MW-3Fuel
ASTs
Pro
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SITE MAP
Top Stop C40
Vernal, Utah
MW-6
MW-7
(not found)
MW-5
MW-14
MW-4
MW-13
MW-2
MW-12
MW-1
MW-15
Drain
Sump
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Gas Line
Sewer Line
Manhole
Scale: 1” equals
approximately 50’
Monitoring Well Location
Sew
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Lin
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FIGURE 3DATE: 5/22/2024PROJECT NO.: 1241-004DEnvironmental Science and Engineering
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4
0
500 South
Top
Stop
Canopy &
Gasoline
Dispensers
Propane
AST
MW-3
(93.82)
Fuel
ASTs
Pro
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Potentiometric Surface Map
Top Stop C40
Vernal, Utah
MW-6
(91.18)
MW-7
(not found)
MW-5
(92.06)
MW-4
(93.18)
MW-13
(94.07)
M
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1
2
(9
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MW-1
(not found)
Drain
Sump
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Gas Line
Sewer Line
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Scale: 1” equals
approximately 50’
Sew
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MW-14
(93.24)
MW-2
(94.39)
Groundwater Contour
0.01 Groundwater Elevation (feet)
Monitoring Well Location
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FIGURE 4DATE: 5/22/2024PROJECT NO.: 1241-004DEnvironmental Science and Engineering
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Diesel
Dispensers
Top
Stop
Canopy &
Gasoline
Dispensers
Propane
AST
MW-3
(<0.005 mg/L)Fuel
ASTs
Pro
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L
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s
Benzene Concentration in Groundwater
Top Stop C40
Vernal, Utah
MW-6
(<0.005 mg/L)
MW-7
(not found)
MW-5
(<0.005 mg/L)
MW-4
MW-13
(0.054 mg/L)
M
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2
(
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1
6
5

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Gas Line
Sewer Line
Manhole
Scale: 1” equals
approximately 50’
Monitoring Well Location
Sew
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Lin
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Benzene Concentration
Benzene Contour
0.01
MW-2
0
.
1
5
MW-14
(0.834 mg/L)
MW-1
(not found)
MW-15
(0.034 mg/L)
0
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2
5
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3
5
0
.
4
5
0
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0.
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5
FIGURE 5PROJECT NO.: 1241-004DEnvironmental Science and Engineering
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0
500 South
Diesel
Dispensers
Top
Stop
Canopy &
Gasoline
Dispensers
Propane
AST
MW-3
(4.1 mg/L)
Fuel
ASTs
Pro
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TPH-DRO Concentation in Groundwater
Top Stop C40
Vernal, Utah
MW-7
(not found)
Drain
Sump
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Oil/water
Separator
W
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Gas Line
Sewer Line
Manhole
Scale: 1” equals
approximately 50’
Monitoring Well Location
Sew
e
r
Lin
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TPH-DRO Concentration
TPH-DRO Contour
0.01
MW-12
(4.1 mg/L)MW-15
(4.5 mg/L)
30
MW-13
(123 mg/L)MW-6
(22.8 mg/L)
MW-14
(9.4 mg/L)
MW-4
MW-2
DATE: 5/22/2024
MW-1
(not found)
50 40607080 20 20MW-5
(3.0 mg/L)
90100
110

Tables

TABLE 1
SUMMARY OF MONITORING WELL CONSTRUCTION AND FIELD MEASUREMENTS
C-40 TOP STOP
VERNAL, UTAH
Well Well Screened Reference Date Depth to Free Corrected Corrected Temperature Dissolved pH Observations
Number Depth Interval Elevation Groundwater Product Depth to Groundwater (Celsius)Oxygen (Standard
(feet)(feet)(feet)(feet)Thickness Groundwater Elevation (mg/L)Units)
(feet)(feet)(feet)
MW-1 11.5 1.5-11.5 101.52 11/10/1996 3.80 0.00 3.80 97.72 15.2 1.7 7.8 4" well
4/29/1997 3.86 0.00 3.86 97.66 11.8 0.5 7.2
7/30/1997 4.55 0.00 4.55 96.97 24 1.2 NM
10/15/1997 3.69 0.00 3.69 97.83 NM NM 7.4
1/15/1998 3.93 0.00 3.93 97.59 7 1.8 7.4
8/25/1998 3.94 0.00 3.94 97.58 21.3 0.4 7
11/18/1998 3.91 0.00 3.91 97.61 12 1.1 7.3
4/5/1999 4.64 0.00 4.64 96.88 10 1.4 7
10/14/1999 4.48 0.00 4.48 97.04 18 1.6 7.5
4/27/2000 4.78 0.00 4.78 96.74 11 1.8 7.5
11/16/2000 4.61 0.00 4.61 96.91 NM NM NM
12/4/2002 NM NM NM NM NM NM NM
5/13/2003 NM NM NM NM NM NM NM not found
12/14/2005 4.06 0.00 4.06 97.46 NM NM NM
6/12/2006 3.36 0.00 3.36 98.16 NM NM NM
11/7/2006 3.63 0.00 3.63 97.89 NM NM NM
5/2/2007 4.56 0.00 4.56 96.96 NM NM NM
5/30/2008 3.98 0.00 3.98 97.54 NM NM NM
10/23/2008 5.85 0.00 5.85 95.67 NM NM NM
4/14/2009 4.37 0.00 4.37 97.15 NM NM NM
11/13/2009 5.65 0.00 5.65 95.87 NM NM NM
4/27/2010 4.95 0.00 4.95 96.57 NM NM NM
11/1/2010 5.22 0.00 5.22 96.30 NM NM NM
5/19/2011 4.08 0.00 4.08 97.44 NM NM NM
11/1/2011 5.01 0.00 5.01 96.51 NM NM NM
5/17/2012 5.03 0.00 5.03 96.49 NM NM NM
11/5/2012 5.02 0.00 5.02 96.50 NM NM NM no sheen or odor
5/7/2013 4.65 0.00 4.65 96.87 NM NM NM
11/18/2013 4.91 0.00 4.91 96.61 NM NM NM
5/7/2014 4.95 0.00 4.95 96.57 NM NM NM
11/3/2014 4.82 0.00 4.82 96.70 NM NM NM
5/11/2015 4.41 0.00 4.41 97.11 NM NM NM
11/11/2015 4.79 0.00 4.79 96.73 NM NM NM
5/10/2016 3.64 0.00 3.64 97.88 NM NM NM casing is broken, dirt is in the well
1/11/2017 4.75 0.00 4.75 96.77 NM NM NM casing is broken, dirt is in the well
5/11/2017 4.80 0.00 4.80 96.72 NM NM NM casing is broken, dirt is in the well
11/8/2017 5.11 0.00 5.11 96.41 NM NM NM casing is broken, dirt is in the well
5/15/2018 5.01 0.00 5.01 96.51 NM NM NM casing is broken, dirt is in the well
11/6/2018 NM NM NM NM NM NM NM casing is broken, dirt is in the well
7/8/2019 NM NM NM NM NM NM NM well could not be located
11/6/2019 NM NM NM NM NM NM NM well could not be located
5/7/2020 NM NM NM NM NM NM NM well could not be located
Page 1
TABLE 1
SUMMARY OF MONITORING WELL CONSTRUCTION AND FIELD MEASUREMENTS
C-40 TOP STOP
VERNAL, UTAH
Well Well Screened Reference Date Depth to Free Corrected Corrected Temperature Dissolved pH Observations
Number Depth Interval Elevation Groundwater Product Depth to Groundwater (Celsius)Oxygen (Standard
(feet)(feet)(feet)(feet)Thickness Groundwater Elevation (mg/L)Units)
(feet)(feet)(feet)
MW-2 14.5 1.5-14.5 100 11/10/1996 3.83 0.00 3.83 96.17 17 0.2 NM 4" well
4/29/1997 3.92 0.00 3.92 96.08 NM NM NM
7/30/1997 4.46 0.00 4.46 95.54 NM NM NM
10/15/1997 3.69 0.00 3.69 96.31 NM NM 7
1/15/1998 3.69 0.00 3.69 96.31 9 0.6 7.5
8/25/1998 3.84 0.00 3.84 96.16 NM NM NM
11/18/1998 3.98 0.00 3.98 96.02 NM NM NM
1/5/1999 4.76 0.00 4.76 95.24 NM NM NM
4/5/1999 4.98 0.00 4.98 95.02 11 2.4 7.5
7/1/1999 4.16 0.00 4.16 95.84 26 0.2 7
10/14/1999 4.54 0.00 4.54 95.46 NM NM NM
1/28/2000 4.95 0.00 4.95 95.05 10.1 0.5 7
4/27/2000 4.98 0.00 4.98 95.02 15 0.7 7
7/10/2000 4.80 0.00 4.80 95.20 25 3.3 7
11/16/2000 4.77 0.00 4.77 95.23 NM NM NM
1/11/2001 4.84 0.00 4.84 95.16 NM NM NM
7/18/2001 4.29 0.00 4.29 95.71 NM NM NM
10/25/2001 4.32 0.00 4.32 95.68 20.5 0.5 6.5
1/29/2002 4.11 0.00 4.11 95.89 8 1.2 7.3
4/4/2002 3.43 0.00 3.43 96.57 NM NM 7
6/25/2002 4.80 0.00 4.80 95.20 24 0.4 NM
12/4/2002 NM NM NM NM NM NM NM
5/13/2003 4.20 0.00 4.20 95.80 NM NM NM trace of product
1/6&7/2004 6.05 0.00 6.05 93.95 12.05 0.30 6.69 sheen
5/4&5/2004 5.96 0.00 5.96 94.04 14.68 0.11 7.14
99.74 12/14/2004 3.45 0.00 3.45 96.29 NM NM NM
6/22/2005 3.60 0.00 3.60 96.14 NM NM NM sheen
12/14/2005 4.05 0.00 4.05 95.69 NM NM NM
6/12/2006 3.16 0.00 3.16 96.58 NM NM NM
11/7/2006 3.71 0.00 3.71 96.03 NM NM NM
5/2/2007 4.53 0.00 4.53 95.21 NM NM NM
1/25/2008 NM NM NM NM NM NM NM well frozen
5/30/2008 4.01 0.00 4.01 95.73 NM NM NM
10/23/2008 6.19 0.00 6.19 93.55 NM NM NM
4/14/2009 4.67 0.00 4.67 95.07 NM NM NM sheen
11/13/2009 6.01 0.02 5.99 93.75 NM NM NM 0.02 feet product
4/27/2010 5.56 0.00 5.56 94.18 NM NM NM trace of free product
11/1/2010 5.79 0.05 5.75 93.99 NM NM NM 0.05 feet product
5/19/2011 4.85 0.00 4.85 94.89 NM NM NM trace of free product
11/1/2011 5.71 0.02 5.69 94.05 NM NM NM 0.02 feet product
5/17/2012 5.76 0.08 5.69 94.05 NM NM NM 0.08 feet product
11/6/2012 5.65 0.03 5.63 94.11 NM NM NM 0.03 feet product
5/7/2013 5.44 0.05 5.40 94.34 NM NM NM 0.05 feet product
11/18/2013 5.51 0.00 5.51 94.23 NM NM NM sheen, petroleum odor
5/7/2014 5.52 0.00 5.52 94.22 NM NM NM sheen, petroleum odor
11/4/2014 5.47 0.00 5.47 94.27 NM NM NM sheen, petroleum odor
5/12/2015 5.11 0.00 5.11 94.63 NM NM NM sheen, petroleum odor
11/11/2015 5.47 0.00 5.47 94.27 NM NM NM sheen, petroleum odor
5/10/2016 4.31 0.00 4.31 95.43 NM NM NM sheen, petroleum odor
1/11/2017 5.15 0.00 5.15 94.59 NM NM NM heavy sheen, petroleum odor
5/11/2017 5.24 0.00 5.24 94.50 NM NM NM
11/8/2017 5.58 0.00 5.58 94.16 NM NM NM
5/15/2018 5.55 0.00 5.55 94.19 NM NM NM sheen, petroleum odor
11/6/2018 NM NM NM NM NM NM NM
7/8/2019 5.59 0.00 5.59 94.15 NM NM NM
11/6/2019 5.99 0.00 5.99 93.75 NM NM NM
5/7/2020 5.10 0.00 5.10 94.64 NM NM NM
11/2/2020 6.13 0.00 6.13 93.61 NM NM NM petroleum odor
5/4/2021 5.26 0.00 5.26 94.48 NM NM NM
11/12/2021 5.28 0.00 5.28 94.46 NM NM NM
5/12/2022 5.31 0.00 5.31 94.43 NM NM NM
11/18/2022 5.40 0.00 5.40 94.34 NM NM NM
5/11/2023 5.02 0.00 5.02 94.72 NM NM NM
11/1/2023 5.88 0.00 5.88 93.86 NM NM NM
5/9/2024 5.35 0.00 5.35 94.39 NM NM NM petroleum odor
Page 2
TABLE 1
SUMMARY OF MONITORING WELL CONSTRUCTION AND FIELD MEASUREMENTS
C-40 TOP STOP
VERNAL, UTAH
Well Well Screened Reference Date Depth to Free Corrected Corrected Temperature Dissolved pH Observations
Number Depth Interval Elevation Groundwater Product Depth to Groundwater (Celsius)Oxygen (Standard
(feet)(feet)(feet)(feet)Thickness Groundwater Elevation (mg/L)Units)
(feet)(feet)(feet)
MW-3 14.5 1.5-14.5 99.57 11/10/1996 3.83 0.00 3.83 95.74 14.5 0.2 NM 4" well
4/29/1997 4.20 0.00 4.20 95.37 10.7 0.4 7
7/30/1997 5.12 0.00 5.12 94.45 9 0.8 7.4
10/15/1997 4.03 0.00 4.03 95.54 NM NM 7.3
1/15/1998 4.10 0.00 4.10 95.47 24 0.4 NM
8/25/1998 4.22 0.00 4.22 95.35 21.6 0.3 7
11/18/1998 4.26 0.00 4.26 95.31 11 0.7 7.6
4/5/1999 5.15 0.00 5.15 94.42 9 1 7.5
10/14/1999 5.12 0.00 5.12 94.45 17.5 0.5 7
4/27/2000 5.11 0.00 5.11 94.46 13 1 7
1/16/2001 5.10 0.00 5.10 94.47 NM NM NM
10/25/2001 4.15 0.00 4.15 95.42 20.5 0.78 NM
1/29/2002 4.49 0.00 4.49 95.08 6 1.8 7.6
4/4/2002 3.47 0.00 3.47 96.10 NM NM 6.6
6/25/2002 5.25 0.00 5.25 94.32 24 1.4 NM
12/4/2002 NM NM NM NM NM NM NM
5/13/2003 4.31 0.00 4.31 95.26 12.75 1.6 6.4
1/6&7/2004 6.06 0.00 6.06 93.51 11.20 1.04 6.46
5/4&5/2004 5.93 0.00 5.93 93.64 14.19 0.40 7.13
99.30 12/14/2004 4.02 0.00 4.02 95.28 NM NM NM
6/22/2005 4.27 0.00 4.27 95.03 NM NM NM
12/14/2005 4.48 0.00 4.48 94.82 NM NM NM
6/12/2006 3.68 0.00 3.68 95.62 NM NM NM
11/7/2006 3.97 0.00 3.97 95.33 NM NM NM
5/2/2007 4.87 0.00 4.87 94.43 NM NM NM
1/25/2008 NM NM NM NM NM NM NM not found
5/30/2008 4.29 0.00 4.29 95.01 NM NM NM
10/23/2008 6.17 0.00 6.17 93.13 NM NM NM
4/14/2009 4.70 0.00 4.70 94.60 NM NM NM sheen
11/13/2009 6.00 0.00 6.00 93.30 NM NM NM
4/27/2010 5.35 0.00 5.35 93.95 NM NM NM
11/1/2010 5.75 0.00 5.75 93.55 NM NM NM
5/19/2011 4.16 0.00 4.16 95.14 NM NM NM
11/1/2011 5.62 0.00 5.62 93.68 NM NM NM
5/17/2012 5.79 0.00 5.79 93.51 NM NM NM
11/6/2012 5.62 0.00 5.62 93.68 NM NM NM petroleum odor
5/7/2013 5.18 0.00 5.18 94.12 NM NM NM sheen, petroleum odor
11/18/2013 5.45 0.00 5.45 93.85 NM NM NM sheen, petroleum odor
5/7/2014 5.53 0.00 5.53 93.77 NM NM NM petroleum odor
11/3/2014 5.32 0.00 5.32 93.98 NM NM NM sheen, petroleum odor
5/11/2015 4.83 0.00 4.83 94.47 NM NM NM sheen, petroleum odor
11/11/2015 5.43 0.00 5.43 93.87 NM NM NM petroleum odor
5/10/2016 3.91 0.00 3.91 95.39 NM NM NM sheen, petroleum odor
1/10/2017 5.30 0.00 5.30 94.00 NM NM NM very heavy sheen, strong petroleum odor
5/11/2017 5.35 0.00 5.35 93.95 NM NM NM heavy sheen, strong petroleum odor
11/8/2017 5.70 0.00 5.70 93.60 NM NM NM heavy sheen, petroleum odor
5/14/2018 5.61 0.00 5.61 93.69 NM NM NM sheen, petroleum odor
11/6/2018 5.69 0.00 5.69 93.61 NM NM NM petroleum odor
7/8/2019 5.62 0.00 5.62 93.68 NM NM NM petroleum odor
11/6/2019 6.05 0.00 6.05 93.25 NM NM NM moderate petroleum odor
5/7/2020 5.43 0.00 5.43 93.87 NM NM NM moderate petroleum odor
11/2/2020 6.18 0.00 6.18 93.12 NM NM NM moderate petroleum odor
5/4/2021 5.43 0.00 5.43 93.87 NM NM NM slight sheen, no odor
11/12/2021 5.32 0.00 5.32 93.98 NM NM NM slight sheen, slight petroleum odor
5/12/2022 5.48 0.00 5.48 93.82 NM NM NM Water clear with no odor
11/18/2022 5.50 0.00 5.50 93.80 NM NM NM slight sheen, petroleum odor
5/11/2023 5.02 0.00 5.02 94.28 NM NM NM slight sheen, petroleum odor
11/1/2023 5.90 0.00 5.90 93.40 NM NM NM
5/9/2024 5.48 0.00 5.48 93.82 NM NM NM slight sheen, petroleum odor
Page 3
TABLE 1
SUMMARY OF MONITORING WELL CONSTRUCTION AND FIELD MEASUREMENTS
C-40 TOP STOP
VERNAL, UTAH
Well Well Screened Reference Date Depth to Free Corrected Corrected Temperature Dissolved pH Observations
Number Depth Interval Elevation Groundwater Product Depth to Groundwater (Celsius)Oxygen (Standard
(feet)(feet)(feet)(feet)Thickness Groundwater Elevation (mg/L)Units)
(feet)(feet)(feet)
MW-4 12 2-12 99.41 11/10/1996 3.78 0.00 3.78 95.63 16.8 0.8 NM 4" well
4/29/1997 3.78 0.00 3.78 95.63 11.4 0.5 7.1
7/30/1997 4.45 0.00 4.45 94.96 29 0.6 NM
10/15/1997 3.76 0.00 3.76 95.65 NM NM 7.3
1/15/1998 3.79 0.00 3.79 95.62 9 0.6 7.3
8/25/1998 3.89 0.00 3.89 95.52 NM NM NM
11/18/1998 4.17 0.00 4.17 95.24 NM NM NM
1/5/1999 4.86 0.00 4.86 94.55 NM NM NM
4/5/1999 5.54 0.00 5.54 93.87 NM NM NM
7/1/1999 5.25 0.00 5.25 94.16 NM NM NM
10/14/1999 5.15 0.00 5.15 94.26 NM NM NM
1/28/2000 5.35 0.00 5.35 94.06 NM NM NM
4/27/2000 5.71 0.00 5.71 93.70 NM NM NM
7/10/2000 4.76 0.00 4.76 94.65 NM NM NM
11/16/2000 4.98 0.00 4.98 94.43 NM NM NM
1/11/2001 4.65 0.00 4.65 94.76 NM NM NM
10/25/2001 4.16 0.00 4.16 95.25 20.4 0.72 NM
12/30/2001 4.18 0.00 4.18 95.23 8.25 1.65 7.2
4/4/2002 3.45 0.00 3.45 95.96 NM NM 7.3
6/25/2002 4.72 0.00 4.72 94.69 NM NM NM
12/4/2002 NM NM NM NM NM NM NM
5/13/2003 4.45 0.13 4.34 95.07 NM NM NM 0.13 feet product
1/6&7/2004 6.45 0.05 6.41 93.00 NM NM NM 0.05 feet product
5/4/2004 6.58 0.31 6.32 93.09 NM NM NM 0.31 feet product
12/14/2004 4.08 0.01 4.07 95.34 NM NM NM ~0.01 feet product
6/22/2005 3.87 0.01 3.86 95.55 NM NM NM 0.01 feet product
12/14/2005 4.55 0.05 4.51 94.90 NM NM NM 0.05 feet product
6/12/2006 3.48 0.01 3.47 95.94 NM NM NM 0.01 feet product
11/7/2006 4.15 0.02 4.13 95.28 NM NM NM 0.02 feet product
5/2/2007 5.28 0.01 5.27 94.14 NM NM NM 0.01 feet product
1/25/2008 6.97 NM NM NM NM NM NM Product present
5/30/2008 4.42 0.00 4.42 94.99 NM NM NM
10/23/2008 6.72 0.00 6.72 92.69 NM NM NM sheen
4/14/2009 5.17 0.00 5.17 94.24 NM NM NM sheen
11/13/2009 6.55 0.00 6.55 92.86 NM NM NM
4/27/2010 6.24 0.00 6.24 93.17 NM NM NM
11/1/2010 6.46 0.00 6.46 92.95 NM NM NM
5/19/2011 5.53 0.00 5.53 93.88 NM NM NM
11/1/2011 6.40 0.03 6.38 93.03 NM NM NM 0.03 feet product
5/17/2012 6.40 0.45 6.03 93.38 NM NM NM 0.45 feet product
11/6/2012 6.35 0.12 6.25 93.16 NM NM NM 0.12 feet product
5/7/2013 6.14 0.03 6.12 93.29 NM NM NM 0.03 feet product
11/18/2013 6.20 0.08 6.13 93.28 NM NM NM 0.08 feet product
5/7/2014 6.40 0.08 6.33 93.08 NM NM NM Droplets of free product, odors
11/4/2014 6.20 0.00 6.20 93.21 NM NM NM sheen, petroleum odor
5/12/2015 5.92 0.00 5.92 93.49 NM NM NM sheen, petroleum odor
11/11/2015 6.29 0.00 6.29 93.12 NM NM NM sheen, petroleum odor
5/10/2016 5.23 0.00 5.23 94.18 NM NM NM sheen, petroleum odor
1/11/2017 6.09 0.00 6.09 93.32 NM NM NM heavy sheen, petroleum odor
5/11/2017 6.11 0.00 6.11 93.30 NM NM NM no sheen, petroleum odor
11/8/2017 6.41 0.00 6.41 93.00 NM NM NM
5/15/2018 6.36 0.00 6.36 93.05 NM NM NM heavy sheen, strong petroleum odor
11/6/2018 NM NM NM NM NM NM NM
7/8/2019 6.41 0.00 6.41 93.00 NM NM NM
11/6/2019 6.74 0.00 6.74 92.67 NM NM NM
5/7/2020 6.24 0.00 6.24 93.17 NM NM NM
11/2/2020 6.83 0.00 6.83 92.58 NM NM NM strong petroleum odor
5/4/2021 6.44 0.16 6.31 93.10 NM NM NM strong petroleum odor
11/12/2021 6.44 0.21 6.27 93.14 NM NM NM 0.21 feet free product
5/12/2022 6.36 0.00 6.36 93.05 NM NM NM strong petroleum odor, no measurable product
11/18/2022 6.35 0.00 6.35 93.06 NM NM NM strong petroleum odor, no measurable product
5/11/2023 5.96 0.00 5.96 93.45 NM NM NM strong petroleum odor, no measurable product
11/1/2023 6.64 0.00 6.64 92.77 NM NM NM slight petroleum odor, no measurable product
5/9/2024 6.23 0.00 6.23 93.18 NM NM NM petroleum odor
Page 4
TABLE 1
SUMMARY OF MONITORING WELL CONSTRUCTION AND FIELD MEASUREMENTS
C-40 TOP STOP
VERNAL, UTAH
Well Well Screened Reference Date Depth to Free Corrected Corrected Temperature Dissolved pH Observations
Number Depth Interval Elevation Groundwater Product Depth to Groundwater (Celsius)Oxygen (Standard
(feet)(feet)(feet)(feet)Thickness Groundwater Elevation (mg/L)Units)
(feet)(feet)(feet)
MW-5 12 2-12 97.94 11/10/1996 3.39 0.00 3.39 94.55 15.9 1.6 NM 4" well
4/29/1997 3.39 0.00 3.39 94.55 11.4 0.3 7
7/30/1997 4.00 0.00 4.00 93.94 25 1 NM
10/15/1997 3.25 0.00 3.25 94.69 NM NM 7.3
1/15/1998 3.42 0.00 3.42 94.52 8 1 7.4
8/25/1998 3.38 0.00 3.38 94.56 22.7 0.3 7
11/18/1998 3.59 0.00 3.59 94.35 13 0.8 7.2
4/5/1999 4.60 0.00 4.60 93.34 8.5 0.8 7.5
10/14/1999 4.52 0.00 4.52 93.42 19 0.6 8
4/27/2000 4.64 0.00 4.64 93.30 12 0.6 7.5
11/16/2000 4.48 0.00 4.48 93.46 NM NM NM
1/29/2002 3.85 0.00 3.85 94.09 8 1.2 7.5
4/4/2002 3.22 0.00 3.22 94.72 NM NM NM
6/25/2002 4.37 0.00 4.37 93.57 24 1 NM
12/4/2002 NM NM NM NM NM NM NM
5/13/2003 4.00 0.00 4.00 93.94 14.75 1.2 6.6 sheen
1/6&7/2004 6.04 0.00 6.04 91.90 13.10 0.28 6.62
5/4&5/2004 5.96 0.00 5.96 91.98 14.79 0.19 6.93
12/14/2004 3.88 0.00 3.88 94.06 NM NM NM
6/22/2005 3.65 0.00 3.65 94.29 NM NM NM
12/14/2005 4.28 0.00 4.28 93.66 NM NM NM
6/12/2006 3.31 0.00 3.31 94.63 NM NM NM
11/7/2006 3.93 0.00 3.93 94.01 NM NM NM
5/2/2007 4.94 0.00 4.94 93.00 NM NM NM
1/25/2008 NM NM NM NM NM NM NM not found
5/30/2008 4.05 0.00 4.05 93.89 NM NM NM
10/23/2008 6.33 0.00 6.33 91.61 NM NM NM sheen
4/14/2009 4.81 0.00 4.81 93.13 NM NM NM sheen
11/13/2009 6.18 0.00 6.18 91.76 NM NM NM
4/27/2010 5.94 0.00 5.94 92.00 NM NM NM
11/1/2010 6.18 0.00 6.18 91.76 NM NM NM
5/19/2011 5.15 0.00 5.15 92.79 NM NM NM
11/1/2011 6.17 0.00 6.17 91.77 NM NM NM
5/17/2012 6.21 0.00 6.21 91.73 NM NM NM
11/5/2012 6.08 0.00 6.08 91.86 NM NM NM petroleum odor
5/7/2013 5.80 0.00 5.80 92.14 NM NM NM sheen, petroleum odor
11/18/2013 5.90 0.00 5.90 92.04 NM NM NM petroleum odor
5/7/2014 6.01 0.00 6.01 91.93 NM NM NM sheen, petroleum odor
11/3/2014 5.87 0.00 5.87 92.07 NM NM NM sheen, petroleum odor
5/11/2015 5.52 0.00 5.52 92.42 NM NM NM sheen, petroleum odor
11/11/2015 5.98 0.00 5.98 91.96 NM NM NM petroleum odor
5/11/2016 4.82 0.00 4.82 93.12 NM NM NM sheen, petroleum odor
1/11/2017 5.76 0.00 5.76 92.18 NM NM NM sheen, petroleum odor
5/11/2017 5.73 0.00 5.73 92.21 NM NM NM sheen, petroleum odor
11/8/2017 6.11 0.00 6.11 91.83 NM NM NM sheen, petroleum odor
5/14/2018 6.00 0.00 6.00 91.94 NM NM NM sheen, petroleum odor
11/6/2018 6.08 0.00 6.08 91.86 NM NM NM petroleum odor
7/9/2019 6.00 0.00 6.00 91.94 NM NM NM petroleum odor
11/6/2019 6.44 0.00 6.44 91.50 NM NM NM slight sheen and petroleum odor
5/7/2020 5.91 0.00 5.91 92.03 NM NM NM petroleum odor
11/2/2020 6.50 0.00 6.50 91.44 NM NM NM petroleum odor
5/4/2021 5.98 0.00 5.98 91.96 NM NM NM petroleum odor
11/12/2021 5.89 0.00 5.89 92.05 NM NM NM slight sheen and petroleum odor
5/12/2022 6.02 0.00 6.02 91.92 NM NM NM no sheen, slight odor
11/18/2022 6.09 0.00 6.09 91.85 NM NM NM slight sheen and petroleum odor
5/11/2023 5.55 0.00 5.55 92.39 NM NM NM slight sheen and petroleum odor
11/1/2023 6.25 0.00 6.25 91.69 NM NM NM
5/9/2024 5.88 0.00 5.88 92.06 NM NM NM sheen, petroleum odor
Page 5
TABLE 1
SUMMARY OF MONITORING WELL CONSTRUCTION AND FIELD MEASUREMENTS
C-40 TOP STOP
VERNAL, UTAH
Well Well Screened Reference Date Depth to Free Corrected Corrected Temperature Dissolved pH Observations
Number Depth Interval Elevation Groundwater Product Depth to Groundwater (Celsius)Oxygen (Standard
(feet)(feet)(feet)(feet)Thickness Groundwater Elevation (mg/L)Units)
(feet)(feet)(feet)
MW-6 12.5 2.5-12.5 96.07 11/10/1996 2.95 0.00 2.95 93.12 14.1 0.9 NM 4" well
4/29/1997 2.88 0.00 2.88 93.19 10.6 0.3 7
7/30/1997 3.76 0.00 3.76 92.31 24 1 NM
10/15/1997 2.69 0.00 2.69 93.38 NM NM 7.4
1/15/1998 2.85 0.00 2.85 93.22 8 1 7.4
8/25/1998 2.76 0.00 2.76 93.31 24.3 0.3 NM
11/18/1998 3.05 0.00 3.05 93.02 12 0.8 6.8
4/5/1999 4.06 0.00 4.06 92.01 9 0.8 7.5
10/14/1999 4.03 0.00 4.03 92.04 18.5 0.8 7.5
4/27/2000 4.05 0.00 4.05 92.02 9 0.9 7.5
96.81 7/18/2001 4.15 0.00 4.15 92.66 NM NM NM
1/29/2002 4.07 0.00 4.07 92.74 NM NM 7
4/4/2002 3.51 0.00 3.51 93.30 NM NM 7.4
6/25/2002 4.78 0.00 4.78 92.03 24.5 0.425 NM
12/4/2002 NM NM NM NM NM NM NM
96.68 5/13/2003 4.00 0.00 4.00 92.68 15 1.3 6.8
1/6&7/2004 6.09 0.01 6.08 90.60 NM NM NM 0.01 feet product
5/4&6/2004 5.96 0.00 5.96 90.72 14.80 0.19 7.08
12/14/2004 4.11 0.00 4.11 92.57 NM NM NM
6/22/2005 4.07 0.00 4.07 92.61 NM NM NM
12/14/2005 4.63 0.00 4.63 92.05 NM NM NM
6/12/2006 3.59 0.00 3.59 93.09 NM NM NM
11/7/2006 4.19 0.00 4.19 92.49 NM NM NM
5/2/2007 5.14 0.00 5.14 91.54 NM NM NM
1/25/2008 NM NM NM NM NM NM NM not found
5/30/2008 4.30 0.00 4.30 92.38 NM NM NM
10/23/2008 6.46 0.00 6.46 90.22 NM NM NM
4/14/2009 5.00 0.00 5.00 91.68 NM NM NM
11/13/2009 6.36 0.00 6.36 90.32 NM NM NM
4/27/2010 6.02 0.00 6.02 90.66 NM NM NM
11/1/2010 6.37 0.00 6.37 90.31 NM NM NM
5/19/2011 5.05 0.00 5.05 91.63 NM NM NM
11/1/2011 6.33 0.00 6.33 90.35 NM NM NM
5/17/2012 6.45 0.00 6.45 90.23 NM NM NM
11/5/2012 6.25 0.00 6.25 90.43 NM NM NM sheen
5/7/2013 5.93 0.00 5.93 90.75 NM NM NM sheen, petroleum odor
11/18/2013 6.08 0.00 6.08 90.60 NM NM NM sheen, petroleum odor
5/7/2014 6.21 0.00 6.21 90.47 NM NM NM sheen, petroleum odor
11/4/2014 5.50 0.00 5.50 91.18 NM NM NM sheen, petroleum odor
5/11/2015 5.48 0.00 5.48 91.20 NM NM NM sheen, petroleum odor
11/11/2015 6.59 0.00 6.59 90.09 NM NM NM sheen, petroleum odor
5/11/2016 4.51 0.00 4.51 92.17 NM NM NM petroleum odor
1/10/2017 5.88 0.00 5.88 90.80 NM NM NM petroleum odor
5/11/2017 5.82 0.00 5.82 90.86 NM NM NM
11/8/2017 6.15 0.00 6.15 90.53 NM NM NM no sheen, petroleum odor
5/14/2018 6.18 0.00 6.18 90.50 NM NM NM sheen, petroleum odor
11/6/2018 6.24 0.00 6.24 90.44 NM NM NM petroleum odor
7/9/2019 6.12 0.00 6.12 90.56 NM NM NM purge water black with sheen and foul odor
11/6/2019 6.64 0.00 6.64 90.04 NM NM NM purge water black with sheen and foul odor
5/7/2020 6.10 0.00 6.10 90.58 NM NM NM purge water black
11/2/2020
5/4/2021 6.08 0.00 6.08 90.60 NM NM NM purge water black with foul odor
11/12/2021 5.90 0.00 5.90 90.78 NM NM NM purge water black with foul odor
5/12/2022 6.17 0.00 6.17 90.51 NM NM NM purge water black with foul odor
11/18/2022 6.18 0.00 6.18 90.50 NM NM NM purge water black with foul odor
5/11/2023 5.63 0.00 5.63 91.05 NM NM NM purge water black with foul odor
11/1/2023 6.45 0.00 6.45 90.23 NM NM NM
5/9/2024 5.50 0.00 5.50 91.18 NM NM NM purge water black with foul odor
Well Obstructed No Measurement
Page 6
TABLE 1
SUMMARY OF MONITORING WELL CONSTRUCTION AND FIELD MEASUREMENTS
C-40 TOP STOP
VERNAL, UTAH
Well Well Screened Reference Date Depth to Free Corrected Corrected Temperature Dissolved pH Observations
Number Depth Interval Elevation Groundwater Product Depth to Groundwater (Celsius)Oxygen (Standard
(feet)(feet)(feet)(feet)Thickness Groundwater Elevation (mg/L)Units)
(feet)(feet)(feet)
MW-7 11.5 1.5-11.5 96.72 11/10/1996 3.80 0.00 3.80 92.92 15.1 3.7 7.3
4/29/1997 3.78 0.00 3.78 92.94 10.6 0.4 7
7/30/1997 4.43 0.00 4.43 92.29 21.5 0.7 NM
10/15/1997 3.56 0.00 3.56 93.16 NM NM 7.3
1/15/1998 3.69 0.00 3.69 93.03 8 1.2 7.3
11/13/2009 NM NM NM NM NM NM NM well not found
4/27/2010 NM NM NM NM NM NM NM well not found
11/1/2010 NM NM NM NM NM NM NM well not found
MW-8 12.5 2.5-12.5 95.94 11/10/1996 3.33 0.00 3.33 92.61 14.5 0.9 NM
4/29/1997 3.30 0.00 3.30 92.64 10.6 0.4 7
7/30/1997 4.08 0.00 4.08 91.86 24.5 0.5 NM
10/15/1997 3.08 0.00 3.08 92.86 NM NM 7.3
MW-9 12 2-12 93.62 11/10/1996 2.95 0.00 2.95 90.67 13.1 0.36 7.4
4/29/1997 2.87 0.00 2.87 90.75 9.9 1.1 7
7/30/1997 3.41 0.00 3.41 90.21 21.5 0.4 NM
10/15/1997 2.66 0.00 2.66 90.96 NM NM 7.4
1/15/1998 3.06 0.00 3.06 90.56 8 0.3 7.5
MW-10 12 2-12 93.73 11/10/1996 3.10 0.00 3.10 90.63 14.7 2.4 7.2
4/29/1997 2.99 0.00 2.99 90.74 9.7 0.3 7.2
7/30/1997 3.98 0.00 3.98 89.75 22 0.6 NM
10/15/1997 2.71 0.00 2.71 91.02 NM NM 7.4
1/15/1998 3.10 0.00 3.10 90.63 8 0.8 7.3
MW-11 12 2-12 92.46 11/10/1996 3.62 0.00 3.62 88.84 13.3 0.3 NM
4/29/1997 3.68 0.00 3.68 88.78 10.3 0.4 7
7/30/1997 4.31 0.00 4.31 88.15 22.5 0.6 NM
10/15/1997 4.31 0.00 4.31 88.15 NM NM 7.3
1/15/1998 3.85 0.00 3.85 88.61 9 0.6 7.3
Page 7
TABLE 1
SUMMARY OF MONITORING WELL CONSTRUCTION AND FIELD MEASUREMENTS
C-40 TOP STOP
VERNAL, UTAH
Well Well Screened Reference Date Depth to Free Corrected Corrected Temperature Dissolved pH Observations
Number Depth Interval Elevation Groundwater Product Depth to Groundwater (Celsius)Oxygen (Standard
(feet)(feet)(feet)(feet)Thickness Groundwater Elevation (mg/L)Units)
(feet)(feet)(feet)
MW-12 8 2-8 100.53 10/17/1997 3.91 0.00 3.91 96.62 NM NM 7.2 2" well
1/15/1998 4.12 0.00 4.12 96.41 9 0.8 7.5
8/25/1998 4.08 0.00 4.08 96.45 21.9 0.3 7
11/18/1998 4.15 0.00 4.15 96.38 12 0.6 7.4
1/5/1999 4.85 0.00 4.85 95.68 8 0.6 8
4/5/1999 5.00 0.00 5.00 95.53 10.5 0.8 7
7/1/1999 4.32 0.00 4.32 96.21 22 0.2 7
10/14/1999 4.64 0.00 4.64 95.89 18.5 1 7.5
1/28/2000 4.7 0.00 4.70 95.83 8.8 0.4 7.5
4/27/2000 4.94 0.00 4.94 95.59 15 1 7.5
7/10/2000 5.01 0.00 5.01 95.52 21.7 1.8 7
11/16/2000 1.8 0.00 1.80 98.73 NM NM NM
1/11/2001 2.44 0.00 2.44 98.09 NM NM NM
7/18/2001 4.27 0.00 4.27 96.26 NM NM NM
10/25/2001 3.63 0.00 3.63 96.90 18.5 0.38 7
1/29/2002 3.1 0.00 3.10 97.43 6.5 3 7.8
4/4/2002 2.54 0.00 2.54 97.99 NM NM 7.4
6/25/2002 4.9 0.00 4.90 95.63 21 0.825 NM
6/25/2002 NM NM NM NM NM NM NM
5/13/2003 4.24 0.00 4.24 96.29 14 5.0 6.7
1/6&7/2004 6.35 0.00 6.35 94.18 10.05 9.13 6.24
1/4&5/2004 5.98 0.00 5.98 94.55 14.42 2.50 7.16
12/14/2004 2.17 0.00 2.17 98.36 NM NM NM
6/22/2005 4.01 0.00 4.01 96.52 NM NM NM
12/14/2005 4.40 0.00 4.40 96.13 NM NM NM
6/12/2006 3.52 0.00 3.52 97.01 NM NM NM
11/7/2006 3.98 0.00 3.98 96.55 NM NM NM
5/2/2007 4.95 0.00 4.95 95.58 NM NM NM
1/25/2008 NM NM NM NM NM NM NM well frozen
5/30/2008 4.22 0.00 4.22 96.31 NM NM NM
10/23/2008 6.30 0.00 6.30 94.23 NM NM NM
4/14/2009 4.79 0.00 4.79 95.74 NM NM NM
11/13/2009 6.14 0.00 6.14 94.39 NM NM NM
4/27/2010 5.57 0.00 5.57 94.96 NM NM NM
11/1/2010 5.84 0.00 5.84 94.69 NM NM NM
5/19/2011 4.95 0.00 4.95 95.58 NM NM NM
11/1/2011 5.73 0.00 5.73 94.80 NM NM NM
5/17/2012 5.78 0.00 5.78 94.75 NM NM NM
11/5/2012 5.70 0.00 5.70 94.83 NM NM NM petroleum odor
5/7/2013 5.36 0.00 5.36 95.17 NM NM NM petroleum odor
11/18/2013 5.58 0.00 5.58 94.95 NM NM NM petroleum odor
5/7/2014 5.63 0.00 5.63 94.90 NM NM NM strong petroleum odor
11/2/2014 5.46 0.00 5.46 95.07 NM NM NM sheen, petroleum odor
5/11/2015 5.05 0.00 5.05 95.48 NM NM NM sheen, petroleum odor
11/11/2015 5.12 0.00 5.12 95.41 NM NM NM petroleum odor
5/10/2016 4.47 0.00 4.47 96.06 NM NM NM sheen, petroleum odor
1/10/2017 5.39 0.00 5.39 95.14 NM NM NM strong petroleum odor
5/11/2017 5.40 0.00 5.40 95.13 NM NM NM petroleum odor
11/8/2017 5.74 0.00 5.74 94.79 NM NM NM no sheen, petroleum odor
5/14/2018 5.63 0.00 5.63 94.90 NM NM NM sheen, petroleum odor
11/6/2018 5.70 0.00 5.70 94.83 NM NM NM petroleum odor
7/9/2019 5.63 0.00 5.63 94.90 NM NM NM petroleum odor
11/6/2019 6.10 0.00 6.10 94.43 NM NM NM slight petroleum odor
5/8/2020 5.48 0.00 5.48 95.05 NM NM NM petroleum odor
11/2/2020 6.20 0.00 6.20 94.33 NM NM NM petroleum odor
5/4/2021 5.54 0.00 5.54 94.99 NM NM NM slight sheen and petroleum odor
11/12/2021 5.47 0.00 5.47 95.06 NM NM NM slight petroleum odor
5/12/2022 5.59 0.00 5.59 94.94 NM NM NM slight petroleum odor
11/18/2022 5.62 0.00 5.62 94.91 NM NM NM
5/11/2023 5.07 0.00 5.07 95.46 NM NM NM sheen, slight petroleum odor
11/1/2023 5.93 0.00 5.93 94.60 NM NM NM
5/9/2024 5.53 0.00 5.53 95.00 NM NM NM sheen, petroleum odor
Page 8
TABLE 1
SUMMARY OF MONITORING WELL CONSTRUCTION AND FIELD MEASUREMENTS
C-40 TOP STOP
VERNAL, UTAH
Well Well Screened Reference Date Depth to Free Corrected Corrected Temperature Dissolved pH Observations
Number Depth Interval Elevation Groundwater Product Depth to Groundwater (Celsius)Oxygen (Standard
(feet)(feet)(feet)(feet)Thickness Groundwater Elevation (mg/L)Units)
(feet)(feet)(feet)
MW-13 9 2-9 99.96 10/17/1997 3.50 0.00 3.50 96.46 NM NM 7.2 2" well
1/15/1998 3.68 0.00 3.68 96.28 7.5 1.2 7.3
8/25/1998 3.69 0.00 3.69 96.27 25.8 0.3 7
11/18/1998 3.85 0.00 3.85 96.11 13 0.4 7.2
1/5/1999 4.59 0.00 4.59 95.37 9.2 0.7 7
4/5/1999 4.83 0.00 4.83 95.13 11 0.6 7
7/1/1999 3.96 0.00 3.96 96.00 25 0.2 7
10/14/1999 4.40 0.00 4.40 95.56 18 0.6 7.5
1/28/2000 4.82 0.00 4.82 95.14 7.4 0.2 7
4/27/2000 4.80 0.00 4.80 95.16 10 0.8 7
7/10/2000 4.59 0.00 4.59 95.37 23.6 3.5 7
11/16/2000 4.77 0.00 4.77 95.19 NM NM NM
1/11/2001 4.74 0.00 4.74 95.22 NM NM NM
99.75 7/18/2001 4.06 0.00 4.06 95.69 NM NM NM
1/29/2002 3.80 0.00 3.80 95.95 NM NM 7.7
4/4/2002 3.35 0.00 3.35 96.40 NM NM 7.7
6/25/2002 4.37 0.00 4.37 95.38 NM NM NM
12/4/2002 NM NM NM NM NM NM NM
5/13/2003 4.10 0.24 3.90 95.85 NM NM NM 0.24 feet product
1/6&7/2004 6.70 0.97 5.90 93.85 NM NM NM 0.97 feet product
5/4/2004 7.01 1.41 5.84 93.91 NM NM NM 1.41 feet product
12/14/2004 3.73 0.27 3.51 96.24 NM NM NM 0.27 feet product
6/23/2005 3.75 0.31 3.49 96.26 NM NM NM 0.31 feet product
12/14/2005 4.35 0.33 4.08 95.67 NM NM NM 0.33 feet product
6/13/2006 3.19 0.14 3.07 96.68 NM NM NM 0.14 feet product
11/8/2006 3.77 0.15 3.65 96.10 NM NM NM 0.15 feet product
5/2/2007 4.76 0.10 4.68 95.07 NM NM NM 0.10 feet product
1/25/2008 6.3 0.00 6.30 93.45 NM NM NM free product
5/30/2008 4.07 0.05 4.03 95.72 NM NM NM 0.05 feet product
10/23/2008 6.79 0.70 6.21 93.54 NM NM NM 0.7 feet product
4/14/2009 4.79 0.15 4.67 95.08 NM NM NM 0.15 feet product
11/13/2009 5.96 0.31 5.70 94.05 NM NM NM 0.31 feet product
4/27/2010 5.56 0.45 5.19 94.56 NM NM NM 0.45 feet product
11/1/2010 5.78 0.12 5.68 94.07 NM NM NM 0.12 feet product
5/19/2011 4.74 0.02 4.72 95.03 NM NM NM 0.02 feet product
11/1/2011 5.75 0.07 5.69 94.06 NM NM NM 0.07 feet product
5/17/2012 5.77 0.12 5.67 94.08 NM NM NM 0.12 feet product
11/6/2012 5.77 0.03 5.75 94.00 NM NM NM 0.03 feet product
5/7/2013 5.14 0.00 5.14 94.61 NM NM NM petroleum odor
11/18/2013 5.59 0.00 5.59 94.16 NM NM NM sheen, droplets, petroleum odor
5/7/2014 5.74 0.00 5.74 94.01 NM NM NM heavy sheen, strong petroleum odor
11/4/2014 6.20 0.00 6.20 93.55 NM NM NM sheen, petroleum odor
5/12/2015 5.28 0.00 5.28 94.47 NM NM NM sheen, petroleum odor
11/11/2015 5.66 0.00 5.66 94.09 NM NM NM sheen, petroleum odor
5/10/2016 4.59 0.00 4.59 95.16 NM NM NM sheen, petroleum odor
1/11/2017 5.47 0.00 5.47 94.28 NM NM NM sheen, petroleum odor
5/12/2017 5.53 0.00 5.53 94.22 NM NM NM sheen, petroleum odor
11/8/2017 5.86 0.00 5.86 93.89 NM NM NM heavy sheen, petroleum odor
5/14/2018 5.71 0.00 5.71 94.04 NM NM NM sheen, petroleum odor
11/6/2018 5.81 0.00 5.81 93.94 NM NM NM sheen, petroleum odor
7/9/2019 5.84 0.00 5.84 93.91 NM NM NM sheen, petroleum odor
11/6/2019 6.14 0.00 6.14 93.61 NM NM NM sheen, strong petroleum odor
5/7/2020 5.57 0.00 5.57 94.18 NM NM NM droplets of free-product, strong petroleum odor
11/2/2020 6.23 0.02 6.21 93.54 NM NM NM free-product, strong petroleum odor
5/4/2021 5.66 0.00 5.66 94.09 NM NM NM sheen, droplets, petroleum odor
11/12/2021 5.62 0.00 5.62 94.13 NM NM NM sheen, droplets, petroleum odor
5/12/2022 5.74 0.00 5.74 94.01 NM NM NM sheen, droplets, petroleum odor
11/18/2022 5.78 0.00 5.78 93.97 NM NM NM sheen, petroleum odor
5/11/2023 5.35 0.00 5.35 94.40 NM NM NM sheen, petroleum odor
11/1/2023 6.08 0.00 6.08 93.67 NM NM NM
5/9/2024 5.68 0.00 5.68 94.07 NM NM NM sheen, petroleum odor
Page 9
TABLE 1
SUMMARY OF MONITORING WELL CONSTRUCTION AND FIELD MEASUREMENTS
C-40 TOP STOP
VERNAL, UTAH
Well Well Screened Reference Date Depth to Free Corrected Corrected Temperature Dissolved pH Observations
Number Depth Interval Elevation Groundwater Product Depth to Groundwater (Celsius)Oxygen (Standard
(feet)(feet)(feet)(feet)Thickness Groundwater Elevation (mg/L)Units)
(feet)(feet)(feet)
MW-14 10 2.5-10 99.16 10/17/1997 3.53 0.00 3.53 95.63 NM NM 7.3 2" well
1/15/1998 3.68 0.00 3.68 95.48 9 0.8 7.4
8/25/1998 3.85 0.00 3.85 95.31 23.2 0.2 7
11/18/1998 3.86 0.00 3.86 95.30 13 0.7 6.9
1/5/1999 1.00 0.00 1.00 98.16 9 0.6 7.5
7/1/1999 4.05 0.00 4.05 95.11 26 0.8 7
10/14/1999 4.94 0.00 4.94 94.22 20 0.2 8
1/28/2000 4.91 0.00 4.91 94.25 9 0.2 7.5
4/27/2000 4.80 0.00 4.80 94.36 11 0.6 7.5
7/10/2000 4.22 0.00 4.22 94.94 23.7 6.7 7.5
1/11/2001 5.50 0.00 5.50 93.66 NM NM NM
99.38 7/18/2001 4.37 0.00 4.37 95.01 NM NM NM
10/25/2001 4.31 0.00 4.31 95.07 19.4 0.5 6.5
1/29/2002 4.18 0.00 4.18 95.20 7 1.45 7.2
4/4/2002 3.42 0.00 3.42 95.96 NM NM 7.4
6/25/2002 4.85 0.00 4.85 94.53 NM NM NM
12/4/2002 NM NM NM NM NM NM NM
5/13/2003 4.38 0.00 4.38 95.00 15 1.0 6.7 sheen
1/6&7/2004 6.40 0.00 6.40 92.98 NM NM NM 0.02 feet product
5/4&6/2004 6.27 0.00 6.27 93.11 15.03 1.6 7.23
12/14/2004 4.11 0.00 4.11 95.27 NM NM NM
6/22/2005 4.13 0.00 4.13 95.25 NM NM NM
12/14/2005 4.63 0.00 4.63 94.75 NM NM NM
6/12/2006 3.70 0.00 3.70 95.68 NM NM NM
11/7/2006 4.24 0.00 4.24 95.14 NM NM NM
5/2/2007 5.25 0.00 5.25 94.13 NM NM NM
1/25/2008 NM NM NM NM NM NM NM not found
5/30/2008 4.43 0.00 4.43 94.95 NM NM NM sheen
10/23/2008 6.63 0.00 6.63 92.75 NM NM NM sheen
4/14/2009 5.08 0.00 5.08 94.30 NM NM NM sheen
11/13/2009 5.96 0.00 5.96 93.42 NM NM NM
4/27/2010 6.01 0.00 6.01 93.37 NM NM NM
11/1/2010 6.29 0.00 6.29 93.09 NM NM NM
5/19/2011 5.29 0.00 5.29 94.09 NM NM NM
11/1/2011 6.23 0.00 6.23 93.15 NM NM NM
5/17/2012 6.30 0.00 6.30 93.08 NM NM NM
11/5/2012 6.18 0.00 6.18 93.20 NM NM NM sheen
5/7/2013 5.96 0.00 5.96 93.42 NM NM NM sheen, petroleum odor
11/18/2013 6.00 0.00 6.00 93.38 NM NM NM sheen, petroleum odor
5/7/2014 6.13 0.00 6.13 93.25 NM NM NM sheen, petroleum odor
11/3/2014 5.61 0.00 5.61 93.77 NM NM NM sheen, petroleum odor
5/12/2015 5.68 0.00 5.68 93.70 NM NM NM sheen, petroleum odor
11/11/2015 6.12 0.00 6.12 93.26 NM NM NM sheen, petroleum odor
5/10/2016 4.88 0.00 4.88 94.50 NM NM NM sheen, petroleum odor
1/11/2017 5.85 0.00 5.85 93.53 NM NM NM slight sheen, petroleum odor
5/12/2017 5.91 0.00 5.91 93.47 NM NM NM petroleum odor
11/8/2017 6.22 0.00 6.22 93.16 NM NM NM no sheen, petroleum odor
5/14/2018 6.12 0.00 6.12 93.26 NM NM NM sheen, petroleum odor
11/6/2018 6.22 0.00 6.22 93.16 NM NM NM petroleum odor
7/9/2019 6.12 0.00 6.12 93.26 NM NM NM petroleum odor
11/6/2019 6.60 0.00 6.60 92.78 NM NM NM slight petroleum odor
5/8/2020 6.10 0.00 6.10 93.28 NM NM NM slight petroleum odor
11/2/2020 6.69 0.00 6.69 92.69 NM NM NM strong petroleum odor
5/4/2021 6.14 0.00 6.14 93.24 NM NM NM slight petroleum odor
11/12/2021 6.15 0.00 6.15 93.23 NM NM NM droplets and petroleum odor
5/12/2022 6.19 0.00 6.19 93.19 NM NM NM slight sheen and petroleum odor
11/18/2022 6.27 0.00 6.27 93.11 NM NM NM sheen, petroleum odor
5/11/2023 5.77 0.00 5.77 93.61 NM NM NM sheen, strong petroleum odor
11/1/2023 6.61 0.00 6.61 92.77 NM NM NM slight petroleum odor
5/9/2024 6.14 0.00 6.14 93.24 NM NM NM sheen, petroleum odor
Page 10
TABLE 1
SUMMARY OF MONITORING WELL CONSTRUCTION AND FIELD MEASUREMENTS
C-40 TOP STOP
VERNAL, UTAH
Well Well Screened Reference Date Depth to Free Corrected Corrected Temperature Dissolved pH Observations
Number Depth Interval Elevation Groundwater Product Depth to Groundwater (Celsius)Oxygen (Standard
(feet)(feet)(feet)(feet)Thickness Groundwater Elevation (mg/L)Units)
(feet)(feet)(feet)
MW-15 8 2-8 98.99 10/17/1997 3.33 0.00 3.33 95.66 NM NM 7.1 2" well
1/15/1998 3.78 0.00 3.78 95.21 8 0.8 7.4
8/25/1998 3.78 0.00 3.78 95.21 23 0.2 7
11/18/1998 3.89 0.00 3.89 95.10 13 0.6 7.2
1/5/1999 4.65 0.00 4.65 94.34 7.4 0.4 8
4/5/1999 5.00 0.00 5.00 93.99 10.5 0.8 7.5
7/1/1999 4.16 0.00 4.16 94.83 24 0.2 7
10/14/1999 4.79 0.00 4.79 94.20 19 0.4 7.5
1/28/2000 4.85 0.00 4.85 94.14 7.6 0.3 7
4/27/2000 4.85 0.00 4.85 94.14 14.5 1.2 7
7/10/2000 4.79 0.00 4.79 94.20 26.7 4 7
11/16/2000 4.75 0.00 4.75 94.24 NM NM NM
98.75 7/18/2001 3.98 0.00 3.98 94.77 NM NM NM
10/25/2001 4.16 0.00 4.16 94.59 19.7 0.37 6.5
1/29/2002 3.80 0.00 3.80 94.95 6 0.8 7.7
4/4/2002 3.12 0.00 3.12 95.63 NM NM 7.1
6/25/2002 4.60 0.00 4.60 94.15 23 0.85 NM
12/4/2002 NM NM NM NM NM NM NM
5/13/2003 3.94 0.00 3.94 94.81 14 1.1 6.9
1/6&7/2004 5.78 0.00 5.78 92.97 9.12 3.13 6.26
5/4&5/2004 5.73 0.00 5.73 93.02 16.84 0.21 7.10
12/14/2004 3.80 0.00 3.80 94.95 NM NM NM
6/22/2005 3.81 0.00 3.81 94.94 NM NM NM
12/14/2005 4.23 0.00 4.23 94.52 NM NM NM
6/12/2006 3.33 0.00 3.33 95.42 NM NM NM
11/7/2006 3.78 0.00 3.78 94.97 NM NM NM
5/2/2007 4.76 0.00 4.76 93.99 NM NM NM
1/25/2008 NM NM NM NM NM NM NM well frozen
5/30/2008 4.04 0.00 4.04 94.71 NM NM NM
10/23/2008 6.15 0.00 6.15 92.60 NM NM NM
4/14/2009 4.62 0.00 4.62 94.13 NM NM NM
11/13/2009 5.98 0.00 5.98 92.77 NM NM NM
4/27/2010 5.46 0.00 5.46 93.29 NM NM NM
11/1/2010 5.81 0.00 5.81 92.94 NM NM NM
5/19/2011 4.61 0.00 4.61 94.14 NM NM NM
11/1/2011 5.75 0.00 5.75 93.00 NM NM NM
5/17/2012 5.82 0.00 5.82 92.93 NM NM NM
11/6/2012 5.70 0.00 5.70 93.05 NM NM NM petroleum odor
5/7/2013 5.36 0.00 5.36 93.39 NM NM NM
11/18/2013 5.54 0.00 5.54 93.21 NM NM NM petroleum odor
5/7/2014 5.62 0.00 5.62 93.13 NM NM NM strong petroleum odor
11/3/2014 5.44 0.00 5.44 93.31 NM NM NM petroleum odor
5/11/2015 4.99 0.00 4.99 93.76 NM NM NM sheen, petroleum odor
11/11/2015 5.55 0.00 5.55 93.20 NM NM NM sheen, petroleum odor
5/10/2016 3.14 0.00 3.14 95.61 NM NM NM petroleum odor
1/10/2017 5.37 0.00 5.37 93.38 NM NM NM strong petroleum odor
5/12/2017 5.36 0.00 5.36 93.39 NM NM NM petroleum odor
11/8/2017 5.71 0.00 5.71 93.04 NM NM NM no sheen, petroleum odor
5/14/2018 5.60 0.00 5.60 93.15 NM NM NM sheen, petroleum odor
11/6/2018 5.69 0.00 5.69 93.06 NM NM NM petroleum odor
7/9/2019 5.64 0.00 5.64 93.11 NM NM NM petroleum odor
11/6/2019 6.12 0.00 6.12 92.63 NM NM NM slight petroleum odor
5/8/2020 5.49 0.00 5.49 93.26 NM NM NM petroleum odor
11/2/2020 6.21 0.00 6.21 92.54 NM NM NM petroleum odor
5/4/2021 5.50 0.00 5.50 93.25 NM NM NM slight petroleum odor and sheen
11/12/2021 5.42 0.00 5.42 93.33 NM NM NM
5/12/2022 5.55 0.00 5.55 93.20 NM NM NM slight odor
11/18/2022 5.59 0.00 5.59 93.16 NM NM NM
5/11/2023 5.10 0.00 5.10 93.65 NM NM NM slight petroleum odor
11/1/2023 5.94 0.00 5.94 92.81 NM NM NM strong petroleum odor
5/9/2024 5.52 0.00 5.52 93.23 NM NM NM sheen, petroleum odor
NM = parameter not measured
Page 11
TABLE 2
SUMMARY OF GROUNDWATER CHEMICAL ANALYSIS
C-40 TOP STOP
VERNAL, UTAH
(all values in mg/L)
Well Sample TPH Benzene Toluene Ethyl-Total Naphtha-MTBE
Number Date GRO DRO Extract (DRO)benzene Xylenes lene
MW-1 11/10/1996 NT <2.0 <0.002 <0.002 <0.002 <0.002 <0.004 NT
4/29/1997 <2.0 <0.002 <0.002 <0.002 <0.002 <0.004 <0.002
7/30/1997 <2.0 <0.002 <0.002 <0.002 <0.002 <0.004 <0.002
10/15/1997 <2.0 <0.002 <0.002 <0.002 <0.002 <0.004 <0.002
1/15/1998 <2.0 0.005 <0.002 <0.002 <0.002 <0.004 0.025
8/25/1998 NT <0.002 <0.002 <0.002 <0.002 <0.004 <0.002
11/18/1998 NT <0.002 <0.002 <0.002 <0.002 <0.004 <0.002
4/5/1999 NT <0.002 <0.002 <0.002 <0.002 <0.004 <0.002
10/14/1999 NT <0.002 <0.002 <0.002 <0.002 <0.004 <0.002
4/27/2000 <0.02 <0.02 NT <0.002 <0.002 <0.002 <0.002 <0.004 <0.002
11/16/2000 <0.02 <0.02 NT <0.001 <0.002 <0.002 <0.002 <0.004 <0.002
4/5/2001 <0.02 <0.02 NT <0.001 <0.002 <0.002 <0.002 <0.004 <0.002
12/4/2002
5/14/2003
12/15/2005 <0.020 <0.020 NT <0.001 <0.002 <0.002 <0.0020 <0.002 <0.002
5/30/2008 <0.020 NT <0.50 <0.001 <0.002 <0.002 <0.0020 <0.002 <0.002
10/24/2008 <0.020 NT <0.50 <0.001 <0.002 <0.002 <0.0020 <0.002 <0.002
4/15/2009 <0.020 NT <0.50 <0.001 <0.002 <0.002 <0.002 <0.002 <0.002
11/13/2009 <0.02 NT <0.5 <0.001 <0.002 <0.002 <0.002 <0.002 <0.002
4/27/2010 <0.020 NT <0.50 <0.0010 <0.0020 <0.0020 <0.0020 <0.0020 <0.0020
11/2/2010 <0.0200 NT <0.500 <0.00100 <0.00200 <0.00200 <0.00200 <0.00200 <0.00200
5/19/2011 <0.0200 NT <0.500 <0.00100 <0.00200 <0.00200 <0.00200 <0.00200 <0.00200
11/1/2011 <0.0200 NT <0.500 <0.00100 <0.00200 <0.00200 <0.00200 <0.00200 <0.00200
5/17/2012 <0.0200 NT <0.500 <0.00100 <0.00200 <0.00200 <0.00200 <0.00200 <0.00200
11/5/2012 <0.0200 NT <0.500 <0.00100 <0.00200 <0.00200 <0.00200 <0.00200 <0.00200
5/7/2013 <0.0200 NT <0.500 <0.00100 <0.00200 <0.00200 <0.00200 <0.00200 <0.00200
11/18/2013 <0.0200 NT <0.500 <0.00100 <0.00200 <0.00200 <0.00200 <0.00200 <0.00200
5/7/2014 0.0208 NT <0.500 <0.00100 <0.00200 <0.00200 <0.00200 <0.00200 <0.00200
11/3/2014 <0.0200 NT <0.500 <0.00100 <0.00200 <0.00200 <0.00200 <0.00200 <0.00200
5/11/2015 <0.0200 NT <0.500 <0.00100 <0.00200 <0.00200 <0.00200 <0.00200 <0.00200
11/11/2015 <0.0200 NT 0.958 <0.00100 <0.00200 <0.00200 <0.00200 <0.00200 <0.00200
5/10/2016 <0.0200 NT <0.500 <0.00100 <0.00200 <0.00200 <0.00200 <0.00200 <0.00200
1/11/2017 <0.0200 NT <0.485 <0.00100 <0.00200 <0.00200 <0.00200 <0.00200 <0.00200
5/11/2017 <0.0200 NT <0.499 <0.00100 <0.00200 <0.00200 <0.00200 <0.00200 <0.00200
INTERIM CLEANUP LEVELS 10 10 10 0.005 1 0.7 10 0.7**0.2
Not Sampled
Not Found
TPH Purge
<0.02
<0.02
<0.02
<0.02
<0.02
<0.02
<0.02
<0.02
TABLE 2
SUMMARY OF GROUNDWATER CHEMICAL ANALYSIS
C-40 TOP STOP
VERNAL, UTAH
(all values in mg/L)
Well Sample TPH Benzene Toluene Ethyl-Total Naphtha-MTBE
Number Date GRO DRO Extract (DRO)benzene Xylenes lene
TPH Purge
MW-2 11/10/1996 3.9 0.011 0.045 0.013 0.13 0.038 NT
MW-2 Duplicate 11/10/1996 6.8 0.008 0.049 0.013 0.13 0.017 NT
MW-2 1 Split 11/10/1996 15.43 0.004 0.042 0.032 0.16 0.141 NT
4/29/1997 150 0.36 6.7 4.6 20 1.3 <0.2
7/30/1997 <4.0T 0.17 0.32 0.064 0.44 0.04 <0.010
10/15/1997 9 0.016 0.067 0.018 0.46 0.11 <0.002
see note 2 10/16/1997 256 0.015 0.022 <0.010 0.257 0.1 <0.002
1/15/1998 <4.0 0.006 0.004 <0.002 0.004 <0.004 0.023
8/25/1998
11/18/1998
1/5/1999
4/5/1999 NT <0.010 0.027 <0.02T 0.25 <0.004 <0.02
7/1/1999 NT 0.046 0.028 0.015 0.075 0.022 <0.002
10/14/1999 NT 0.019 0.0056 <0.002 0.019 <0.004 <0.002
1/28/2000 NT <0.001 <0.002 <0.002 <0.002 <0.004 <0.002
4/27/2000 1 1.7 NT 0.038 <0.002 0.0026 0.011 0.0099 0.0022
7/10/2000 <0.020 <0.020 NT 0.0022 <0.002 <0.002 <0.002 <0.004 <0.002
11/16/2000 0.62 0.098 NT 0.011 <0.002 <0.002 <0.002 <0.004 <0.002
1/11/2001 0.22 0.029 NT 0.0031 <0.002 <0.002 <0.002 <0.004 <0.002
4/5/2001 0.54 <0.02 NT 0.031 0.0034 0.0053 0.052 0.013 <0.002
7/18/2001 0.32 0.16 NT 0.036 0.0071 0.0023 0.016 0.0025 <0.002
10/26/2001 0.12 <0.020 NT 0.031 <0.0020 0.0022 0.0036 <0.0020 0.0021
1/30/2002 0.65 <0.020 NT 0.27 0.01 0.01 0.039 0.0066 0.0044
4/4/2002 0.75 NT <5.0 0.21 0.011 0.013 0.055 0.0099 0.0041
12/4/2002
5/14/2003
1/7/2004 0.57 <0.020 NT 0.19 0.0020 0.0084 0.0064 <0.002 <0.002
5/5/2004 0.68 <0.020 NT 0.23 0.0028 0.011 0.0022 <0.0020 <0.0020
12/15/2004 0.048 <0.020 NT 0.0074 <0.0020 <0.0020 <0.0020 <0.0020 <0.0020
6/22/2005 Not sampled due to sheen of yellowish-brown weathered free product accumulation
12/15/2005 <0.020 <0.020 NT 0.06 <0.020 <0.020 <0.020 <0.020 <0.020
6/13/2006 0.11 <0.020 NT 0.045 <0.0020 0.0026 <0.0020 <0.0020 <0.0020
11/8/2006 <0.20 <0.20 NT 0.094 <0.020 <0.020 <0.020 <0.020 <0.020
5/3/2007 0.64 0.15 NT 0.23 <0.0020 0.010 0.0033 <0.0020 <0.0020
1/25/2008
5/30/2008 <0.20 NT 0.72 0.04 <0.020 <0.020 <0.020 <0.020 <0.020
10/24/2008 0.76 NT 7.8 0.23 0.0042 0.014 0.036 <0.002 <0.0020
4/15/2009 0.47 NT 9.4 0.12 0.0031 0.0038 0.019 0.0026 <0.0020
11/13/2009 1.1 NT 0.86 0.22 0.0041 0.025 0.077 0.012 <0.002
4/27/2010 0.43 NT 5.8 0.075 <0.0020 0.0033 0.057 0.016 <0.0020
11/2/2010 0.612 NT 31.2 0.147 0.00259 0.0277 0.0542 0.0193 <0.00200
5/19/2011 0.912 NT 15.0 0.125 <0.0200 <0.0200 0.0319 <0.0200 <0.0200
11/1/2011 0.549 NT 22.4 0.130 <0.00200 0.0186 0.0183 0.00684 <0.00200
5/17/2012 <0.200 NT 34.6 0.0471 <0.00200 <0.0200 0.0209 <0.0200 <0.00200
11/5/2012 <0.200 NT 13.6 0.0319 <0.0200 <0.0200 0.0839 0.0604 <0.0200
5/7/2013 0.249 NT 0.711 0.0652 <0.00200 <0.00200 0.00640 0.00668 <0.00200
11/18/2013 <0.200 NT 22.7 0.0458 <0.0200 <0.0200 <0.0200 <0.0200 <0.0200
5/8/2014 0.333 NT 12.7 0.0478 <0.0200 <0.0200 <0.0200 <0.0200 <0.0200
11/4/2014 0.511 NT 14.7 0.0965 <0.0200 <0.0200 <0.0200 <0.0200 <0.0200
5/12/2015 0.318 NT 6.05 0.0247 <0.0200 <0.0200 <0.0200 <0.0200 <0.0200
11/11/2015 0.231 NT 3.30 0.0366 <0.00200 <0.00200 <0.00200 <0.00200 <0.00200
5/10/2016 0.178 NT 13.3 0.00438 <0.00200 <0.00200 <0.00200 <0.00200 <0.00200
1/11/2017 0.122 NT 3.42 0.0524 <0.00200 0.00377 <0.00200 <0.00200 <0.00200
5/11/2017 <0.0200 NT 4.15 0.0123 <0.0200 <0.0200 <0.0200 <0.0200 <0.0200
INTERIM CLEANUP LEVELS 10 10 10 0.005 1 0.7 10 0.7**0.2
Not sampled due to 0.01 feet of free product accumulation
Not sampled due to trace of free product accumulation
NT
NT
0.9
NT
Not sampled due to 0.01 feet of free product accumulation
<0.02
Not sampled due to 0.05 feet of free product accumulation
Not sampled due to 0.02 feet of free product accumulation
100
1.2
4.4
1.5
0.15
0.54
9.7
Well not sampled - top of well frozen solid
TABLE 2
SUMMARY OF GROUNDWATER CHEMICAL ANALYSIS
C-40 TOP STOP
VERNAL, UTAH
(all values in mg/L)
Well Sample TPH Benzene Toluene Ethyl-Total Naphtha-MTBE
Number Date GRO DRO Extract (DRO)benzene Xylenes lene
TPH Purge
MW-3 11/10/1996 3.2 0.015 <0.002 0.003 0.008 0.01 NT
4/29/1997 <2.0 0.016 <0.002 <0.002 0.002 <0.004 <0.002
7/30/1997 <4.0T 0.046 <0.010 <0.010 <0.010 0.048 <0.010
10/15/1997 <2.0 0.044 <0.002 0.006 0.005 <0.004 <0.002
1/15/1998 <4.0 0.047 0.003 0.009 0.018 0.016 0.029
8/25/1998 NT <2.13E <0.002 0.046 0.008 <0.004 <0.002
11/18/1998 NT 0.061 <0.002 0.023 0.0047 <0.004 <0.002
4/5/1999 NT 0.064 <0.002 0.027 0.0051 <0.004 <0.002
10/14/1999 0.17 NT 0.06 <0.002 0.021 0.0051 <0.004 <0.002
4/27/2000 0.16 <0.02 NT 0.045 <0.002 0.025 0.014 0.0066 <0.002
11/16/2000 0.33 0.046 NT 0.038 <0.002 0.024 0.013 0.005 <0.002
4/5/2001 0.23 <0.020 NT 0.013 <0.002 0.01 <0.002 <0.004 <0.002
10/25/2001
1/30/2002 0.65 <0.020 NT 0.27 0.01 0.01 0.039 0.0066 0.0044
4/4/2002 0.16 NT <5.0 0.026 <0.0020 0.01 0.0095 0.0035 <0.0020
12/4/2002
5/14/2003 <0.05 NT <2.0 0.002 <0.001 0.002 <0.003 0.002 <0.001
1/7/2004 0.18 <0.020 NT 0.011 <0.0020 0.024 0.0025 0.0047 <0.0020
5/5/2004 0.067 <0.020 NT 0.0037 <0.0020 0.0041 <0.0020 <0.0020 <0.0020
12/15/2004 0.51 <0.020 NT 0.036 <0.0020 0.073 0.14 0.034 <0.0020
6/23/2005 0.24 <0.020 NT 0.020 <0.0020 0.031 0.021 0.0097 <0.0020
12/15/2005 0.11 <0.020 NT 0.008 <0.0020 0.013 0.015 0.0046 <0.0020
6/13/2006 0.17 <0.020 NT 0.013 <0.0020 0.020 0.027 0.0067 <0.0020
11/8/2006 0.13 <0.020 NT 0.0093 <0.0020 <0.013 0.028 0.0083 <0.0020
5/3/2007 0.19 <0.020 NT 0.0075 <0.0020 0.010 0.015 0.0037 <0.0020
1/25/2008
5/30/2008 0.62 NT 3.7 0.0071 <0.0020 0.017 0.045 0.027 <0.0020
10/24/2008 0.17 NT 1.2 0.0062 <0.0020 0.007 0.011 0.004 <0.0020
4/15/2009 0.039 NT 0.99 0.0046 0.0030 0.005 0.0054 <0.002 <0.0020
11/13/2009 0.012 NT 0.58 0.011 <0.002 0.015 0.027 0.012 <0.002
4/27/2010 0.041 NT 2.3 0.0047 <0.0020 0.0070 0.0062 0.0023 <0.0020
11/2/2010 0.207 NT 7.30 0.0117 <0.00200 0.0304 0.0644 0.0258 <0.00200
5/19/2011 0.0774 NT 3.09 0.00509 <0.00200 0.0156 0.0136 0.0104 <0.00200
11/2/2011 0.193 NT 1.20 0.00833 <0.00200 0.0407 0.0688 0.0295 <0.00200
5/18/2012 0.0424 NT <0.500 0.00296 <0.00200 0.00967 0.00935 0.00556 <0.00200
11/6/2012 0.135 NT 0.685 0.00475 <0.00200 0.0195 0.0362 0.0156 <0.00200
5/7/2013 <0.0200 NT <0.500 0.00114 <0.00200 0.00327 0.00212 0.00295 <0.00200
11/18/2013 0.0842 NT 0.553 0.00317 <0.00200 0.0141 0.0199 0.00728 <0.00200
5/7/2014 0.0377 NT 0.588 0.00185 <0.00200 0.00526 0.00746 0.00598 <0.00200
11/3/2014 0.0465 NT 0.676 0.00280 <0.00200 0.00858 0.0173 <0.00200 <0.00200
5/11/2015 0.124 NT <0.500 0.00439 <0.00200 0.0117 0.0385 0.0131 <0.00200
11/11/2015 0.0836 NT 0.856 0.00409 <0.00200 0.0090 0.03 0.0214 <0.00200
5/10/2016 0.0452 NT 7.40 <0.00100 <0.00200 0.00565 0.0155 <0.00200 <0.00200
1/10/2017 4.39 NT 2.53 0.00526 0.00268 0.605 3.68 0.0187 <0.00200
5/11/2017 8.49 NT 43.7 <0.0500 <0.100 0.462 8.03 <0.100 <0.100
11/8/2017 1.06 NT 12.9 0.00132 <0.00200 0.107 0.882 <0.00200 <0.00200
5/14/2018 0.290 NT 6.32 <0.0100 <0.0200 0.0399 0.250 <0.0200 <0.0200
11/6/2018 0.0453 NT 0.764 <0.00100 <0.00200 0.00673 0.0137 0.00217 <0.00200
7/9/2019 0.238 NT 49.5 0.00278 <0.00200 0.0350 0.139 0.00638 <0.00200
11/6/2019 0.326 NT 21.0 0.0207 0.0405 0.0220 0.124 0.00571 <0.00200
5/7/2020 0.0927 NT 6.33 0.00163 <0.00200 0.0130 0.0339 0.00351 <0.00200
11/2/2020 <0.0200 NT 1.92 <0.00100 <0.00200 0.00259 0.00509 <0.00200 <0.00200
5/4/2021 <0.0200 NT <0.504 0.00137 <0.00200 0.00859 0.00586 <0.00200 <0.00200
11/11/2021 0.0308 NT 4.98 <0.00100 <0.00200 0.00353 0.00410 0.00211 <0.00200
5/12/2022 <0.125 NT 1.2 <0.005 <0.012 <0.012 <0.012 <0.012 <0.005
11/18/2022 <0.125 NT 4.7 <0.005 <0.012 <0.012 <0.012 <0.012 <0.005
5/11/2023 0.144 NT 5.0 <0.005 <0.012 <0.012 <0.012 <0.012 <0.005
11/2/2023 <0.125 NT <1.0 <0.005 <0.012 <0.012 <0.012 <0.012 <0.005
5/9/2024 <0.125 NT 4.1 <0.005 <0.012 <0.012 <0.012 <0.012 <0.005
INTERIM CLEANUP LEVELS 10 10 10 0.005 1 0.7 10 0.7**0.2
0.52
Not sampled due to .75 inches of free product accumulation
Not Measured
Well not sampled - buried beneath 1 foot of snow
NT
0.75
1.8
0.17
0.61
0.43
0.85
TABLE 2
SUMMARY OF GROUNDWATER CHEMICAL ANALYSIS
C-40 TOP STOP
VERNAL, UTAH
(all values in mg/L)
Well Sample TPH Benzene Toluene Ethyl-Total Naphtha-MTBE
Number Date GRO DRO Extract (DRO)benzene Xylenes lene
TPH Purge
MW-4 11/10/1996 <2.0 <0.002 <0.002 <0.002 0.002 0.01 NT
4/29/1997 <2.0 <0.002 <0.002 <0.002 <0.002 <0.004 <0.002
7/30/1997 63 0.008 <0.005 0.028 0.11 0.06 0.063
10/15/1997 760 <0.002 0.005 0.005 0.033 0.099 <0.002
10/15/1997 10.1 0.012 <0.010 0.063 0.16 1.3 <0.002
see note 2,3 1/15/1998 24 <0.001 <0.002 <0.002 <0.002 0.017 <0.002
8/25/1998
11/18/1998
1/5/1999
4/5/1999
7/1/1999
10/14/1999
1/28/2000
4/27/2000
7/10/2000
11/16/2000 1.3 0.58 NT <0.001 <0.002 0.0086 0.023 0.048 NT
1/11/2001 0.67 0.1 NT <0.001 <0.002 0.004 0.0066 0.034 <0.002
4/5/2001 0.43 0.25 NT <0.001 <0.002 <0.002 0.0021 0.021 <0.002
7/18/2001 0.47 0.22 NT <0.001 <0.002 <0.002 <0.002 0.023 <0.002
10/25/2001
1/30/2002 0.074 <0.02 NT 0.0021 <0.002 0.0022 <0.002 0.0023 <0.002
4/4/2002 0.19 NT <5.0 0.0012 <0.002 <0.002 <0.002 0.0026 <0.002
6/25/2002
12/4/2002
5/14/2003
1/6/2004 Not sampled due to 0.05 feet of free product accumulation
5/4/2004
12/14/2004
6/22/2005 Not sampled due to 0.01 feet of free product accumulation
12/14/2005 Not sampled due to 0.05 feet of free product accumulation
6/13/2006 Not sampled due to 0.01 feet of free product accumulation
11/7/2006
5/2/2007
1/25/2008 <0.2 <0.2 NT <0.01 <0.02 <0.02 <0.02 <0.02 <0.02
5/30/2008 <0.2 5.1 NT <0.01 <0.02 <0.02 <0.02 <0.02 <0.02
Duplicate 5/30/2008 <0.2 NT 4.9 <0.01 <0.02 <0.02 <0.02 <0.02 <0.02
10/24/2008 0.26 NT 22 <0.001 <0.002 <0.002 <0.002 <0.002 <0.002
4/15/2009 0.037 NT 1.4 <0.0010 <0.0020 <0.0020 <0.0020 <0.0020 <0.0020
11/13/2009 0.031 NT 1.2 <0.001 <0.002 <0.002 <0.002 <0.002 <0.002
4/27/2010 0.048 NT 1.1 <0.0010 <0.0020 <0.0020 <0.0020 <0.0020 <0.0020
11/2/2010 0.0213 NT 11.2 <0.00100 <0.00200 <0.00200 <0.00200 <0.00200 <0.00200
5/19/2011 <0.0200 NT 5.22 <0.00100 <0.00200 <0.00200 <0.00200 <0.00200 <0.00200
11/1/2011 0.0371 NT 11.2 <0.00100 <0.00200 <0.00200 <0.00200 0.00450 <0.00200
5/17/2012 <0.200 NT 19.6 <0.0100 <0.0200 <0.0200 <0.0200 0.0549 <0.0200
11/6/2012 0.221 NT 106 <0.0100 <0.0200 <0.0200 <0.0200 0.221 <0.0200
5/7/2013 0.0279 NT <0.500 <0.00100 <0.00200 <0.00200 <0.00200 0.00663 <0.00200
11/18/2013 <0.200 NT 11.7 <0.0100 <0.0200 <0.0200 <0.0200 <0.0200 <0.0200
5/8/2014 <0.200 NT 6.02 <0.0100 <0.0200 <0.0200 <0.0200 <0.0200 <0.0200
11/4/2014 <0.200 NT 4.11 <0.0100 <0.0200 <0.0200 <0.0200 <0.0200 <0.0200
5/12/2015 0.0332 NT 0.946 <0.00100 <0.00200 <0.00200 <0.00200 <0.00200 <0.00200
11/11/2015 0.0405 NT 6.43 <0.00100 <0.00200 0.00262 <0.00200 <0.00200 <0.00200
5/10/2016 0.0219 NT 4.99 <0.00100 <0.00200 0.00262 <0.00200 <0.00200 <0.00200
1/11/2017 <0.200 NT 1.85 <0.0100 <0.0200 <0.0200 <0.0200 <0.0200 <0.0200
5/11/2017 <0.0200 NT 0.790 <0.00100 <0.00200 <0.00200 <0.00200 <0.00200 <0.00200
INTERIM CLEANUP LEVELS 10 10 10 0.005 1 0.7 10 0.7**0.2
Not sampled due to 0.13 feet of free product accumulation
Not sampled due to 0.31 feet of free product accumulation
Not sampled due to 0.01 feet of free product accumulation
Not sampled due to 0.02 feet of free product accumulation
Not sampled due to 0.01 feet of free product accumulation
Not sampled due to 0.98 feet of free product accumulation
Not sampled due to .25 inches of free product accumulation
Not sampled due to free product in well
Not sampled due to 1.00 feet of free product accumulation
Not sampled due to 1.90 feet of free product accumulation
Not sampled due to 1.30 feet of free product accumulation
Not sampled due to 0.71 feet of free product accumulation
Not sampled due to 0.71 feet of free product accumulation
Not sampled due to 0.13 feet of free product accumulation
Not sampled due to 0.03 feet of free product accumulation
Not sampled due to 0.01 feet of free product accumulation
Not sampled due to 0.12 feet of free product accumulation
1.9
2.7
3.7
1.6
NT
<0.02
TABLE 2
SUMMARY OF GROUNDWATER CHEMICAL ANALYSIS
C-40 TOP STOP
VERNAL, UTAH
(all values in mg/L)
Well Sample TPH Benzene Toluene Ethyl-Total Naphtha-MTBE
Number Date GRO DRO Extract (DRO)benzene Xylenes lene
TPH Purge
MW-5 11/10/1996 <2.0 <0.002 <0.002 <0.002 <0.002 <0.004 NT
4/29/1997 <2.0 <0.002 <0.002 <0.002 <0.002 <0.004 <0.002
7/30/1997 <4.0 <0.002 <0.002 <0.002 <0.002 <0.004 <0.002
10/15/1997 <2.0 <0.002 <0.002 <0.002 <0.002 <0.004 <0.002
1/15/1998 <4.0 <0.001 <0.002 <0.002 <0.002 <0.004 <0.002
8/25/1998 NT 0.001 <0.002 0.003 0.002 <0.004 <0.002
11/18/1998 NT <0.001 <0.002 <0.002 <0.002 <0.004 <0.002
4/5/1999 NT <0.001 <0.002 <0.002 <0.002 <0.004 <0.002
10/17/1999 NT <0.001 <0.002 <0.002 0.0023 <0.004 <0.002
4/27/2000 0.11 <0.02 NT <0.001 <0.002 <0.002 <0.002 <0.004 <0.002
11/16/2000 0.14 0.052 NT <0.001 <0.002 <0.002 <0.002 <0.004 <0.002
4/5/2001 0.12 <0.02 NT <0.001 <0.002 <0.002 <0.002 <0.004 <0.002
1/30/2002 0.15 <0.02 NT <0.001 <0.002 <0.002 <0.002 <0.002 <0.002
12/4/2002
5/14/2003 0.544 NT <2.0 0.005 <0.001 0.010 0.050 0.022 <0.001
1/7/2004 0.77 <0.020 NT 0.0036 <0.0020 <0.0020 <0.0020 0.0020 <0.0020
5/5/2004 0.87 0.023 NT 0.015 0.0022 0.043 0.051 0.0140 <0.0020
12/15/2004 0.66 0.029 NT <0.0010 <0.0020 0.011 <0.0020 0.0037 <0.0020
6/23/2005 0.041 <0.020 NT <0.0010 <0.0020 <0.0020 <0.0020 <0.0020 <0.0020
12/15/2005 0.080 <0.020 NT <0.0010 <0.0020 <0.0020 <0.0020 <0.0020 <0.0020
6/13/2006 <0.020 <0.020 NT <0.0010 <0.0020 <0.0020 <0.0020 <0.0020 <0.0020
11/8/2006 0.18 <0.020 NT <0.0010 <0.0020 <0.0020 <0.0020 <0.0020 <0.0020
5/3/2007 0.27 0.12 NT <0.0010 <0.0020 <0.0020 <0.0020 <0.0020 <0.0020
1/25/2008
5/30/2008 <0.2 NT <0.50 <0.0010 <0.0020 <0.0020 <0.0020 <0.0020 <0.0020
10/24/2008 0.17 NT 1.1 <0.0010 <0.0020 <0.0020 <0.0020 <0.0020 <0.0020
4/15/2009 0.16 NT 1.8 0.0018 <0.0020 <0.0020 <0.0020 <0.0020 <0.0020
11/13/2009 0.15 NT 1.7 <0.001 <0.002 <0.002 <0.002 <0.002 <0.002
4/27/2010 0.16 NT <0.50 0.0045 <0.0020 <0.0020 <0.0020 <0.0020 <0.0020
11/2/2010 0.131 NT 7.34 <0.00100 <0.00200 <0.00200 <0.00200 <0.00200 <0.00200
5/19/2011 0.223 NT 8.34 <0.00100 <0.00200 <0.00200 <0.00200 <0.00200 <0.00200
11/1/2011 0.236 NT 2.27 <0.00100 <0.00200 <0.00200 <0.00200 <0.00200 <0.00200
5/18/2012 0.126 NT 2.16 <0.00100 <0.00200 <0.00200 <0.00200 <0.00200 <0.00200
11/5/2012 0.206 NT 3.27 <0.00500 <0.0100 <0.0100 <0.0100 0.0230 <0.0100
5/7/2013 0.0239 NT 1.52 0.00326 <0.00200 <0.00200 <0.00200 <0.00200 <0.00200
11/18/2013 <0.0200 NT 2.23 <0.00100 <0.00200 <0.00200 <0.00200 <0.00200 <0.00200
5/7/2014 0.181 NT 2.35 0.00402 <0.00200 <0.00200 <0.00200 <0.00200 <0.00200
11/3/2014 0.190 NT 2.67 <0.00100 <0.00200 <0.00200 <0.00200 <0.00200 <0.00200
5/11/2015 0.158 NT 0.734 <0.00100 <0.00200 <0.00200 <0.00200 <0.00200 <0.00200
11/11/2015 0.149 NT 0.611 <0.00100 <0.00200 <0.00200 <0.00200 <0.00200 <0.00200
5/11/2016 0.135 NT 3.18 0.00170 <0.00200 <0.00200 <0.00200 <0.00200 <0.00200
1/11/2017 0.229 NT 1.24 <0.00100 <0.00200 <0.00200 <0.00200 <0.00200 <0.00200
5/11/2017 0.214 NT 1.48 0.00196 <0.00200 <0.00200 <0.00200 <0.00200 <0.00200
11/8/2017 0.233 NT 1.22 <0.00100 <0.00200 <0.00200 <0.00200 <0.00200 <0.00200
5/14/2018 0.209 NT <0.479 <0.00100 <0.00200 <0.00200 <0.00200 <0.00200 <0.00200
11/6/2018 0.0944 NT <0.486 <0.00100 <0.00200 <0.00200 <0.00200 <0.00200 <0.00200
7/9/2019 0.262 NT 4.13 0.00277 <0.00200 <0.00200 <0.00200 <0.00200 <0.00200
11/6/2019 0.190 NT 3.68 <0.00100 <0.00200 <0.00200 <0.00200 <0.00200 <0.00200
5/7/2020 0.158 NT 2.26 <0.00100 <0.00200 <0.00200 <0.00200 <0.00200 <0.00200
11/2/2020 0.132 NT 2.21 <0.00100 <0.00200 <0.00200 <0.00200 <0.00200 <0.00200
5/5/2021 0.155 NT <0.501 <0.00100 <0.00200 <0.00200 <0.00200 <0.00200 <0.00200
11/11/2021 0.138 NT 1.56 <0.00100 <0.00200 <0.00200 <0.00200 <0.00200 <0.00200
5/12/2022 0.125 NT <1.0 <0.005 <0.012 <0.012 <0.012 <0.012 <0.005
11/18/2022 <0.125 NT 1.1 <0.005 <0.012 <0.012 <0.012 <0.012 <0.005
5/11/2023 0.646 NT 6.4 0.020 <0.012 <0.012 <0.012 <0.012 <0.005
11/2/2023 <0.125 NT <1.0 <0.005 <0.012 <0.012 <0.012 <0.012 <0.005
5/9/2024 <0.125 NT 3.0 <0.005 <0.012 <0.012 <0.012 <0.012 <0.005
INTERIM CLEANUP LEVELS 10 10 10 0.005 1 0.7 10 0.7**0.2
1.6
0.33
Not sampled
Well not sampled - buried beneath 6 inches of packed ice
0.035
0.29
0.86
0.27
NT
0.039
0.099
TABLE 2
SUMMARY OF GROUNDWATER CHEMICAL ANALYSIS
C-40 TOP STOP
VERNAL, UTAH
(all values in mg/L)
Well Sample TPH Benzene Toluene Ethyl-Total Naphtha-MTBE
Number Date GRO DRO Extract (DRO)benzene Xylenes lene
TPH Purge
MW-6 11/10/1996 <2.0 <0.002 <0.002 <0.002 <0.002 <0.004 NT
4/29/1997 <2.0 0.019 <0.002 <0.002 <0.002 <0.004 <0.002
7/30/1997 <4.0 0.002 <0.002 <0.002 <0.002 0.005 <0.002
10/15/1997 <2.0 0.015 <0.002 0.022 <0.002 <0.004 <0.002
1/15/1998 <4.0 0.022 <0.005 0.007 <0.005 <0.010 <0.005
8/25/1998 NT 0.006 <0.002 <0.002 <0.002 <0.004 <0.002
11/18/1998 NT 0.0053 <0.002 <0.002 <0.002 <0.004 <0.002
4/5/1999 NT 0.026 <0.002 <0.002 0.0021 <0.004 <0.002
10/17/1999 NT 0.38E 0.0056 0.19E 0.026 0.051 <0.002
4/27/2000 1.2 <0.02 NT 0.31E 0.004 0.075 0.041 <0.004 0.0024
7/18/2001 1.5 0.067 NT 0.14 0.008 0.24 0.059 0.0091 <0.002
1/29/2002
1/30/2002 1.9 0.023 NT 0.2 0.02 0.41 0.18 0.015 <0.002
4/4/2002 3 NT <5.0 0.24 0.018 0.42 0.13 0.0024 <0.002
12/4/2002
5/14/2003 1.3 NT <2.0 0.185 0.017 0.018 0.066 0.034 <0.001
1/6/2004 Not sampled due to 0.01 feet of free product accumulation
5/6/2004 1.2 0.037 NT 0.27 0.017 0.046 0.088 0.027 0.018
12/15/2004 1.4 0.17 NT 0.28 0.012 0.085 0.085 0.027 0.0056
6/23/2005 1.2 0.12 NT 0.30 0.0073 0.074 0.047 0.013 0.016
12/15/2005 0.38 <0.20 NT 0.020 <0.020 0.027 <0.020 <0.020 <0.020
6/13/2006 0.55 0.18 NT 0.045 0.0030 0.023 0.018 0.0050 <0.0020
11/8/2006 0.33 <0.20 NT 0.038 <0.020 <0.020 <0.020 <0.020 <0.020
5/3/2007 0.54 0.045 NT 0.015 <0.0020 0.0059 <0.0020 <0.0020 <0.0020
1/25/2008
5/30/2008 0.67 NT 3.9 0.038 <0.0020 0.011 0.011 0.0052 <0.0020
10/24/2008 0.46 NT 2.6 0.023 <0.0020 0.0062 0.0048 <0.0020 <0.0020
4/15/2009 0.14 NT 1.6 0.031 0.0035 0.0047 0.0031 <0.0020 <0.0020
11/13/2009 0.46 NT 6.6 0.060 0.0040 0.028 0.066 0.033 <0.002
4/27/2010 0.13 NT 3.3 0.024 <0.0020 0.0038 0.0041 0.0021 <0.0020
11/2/2010 0.0720 NT 3.74 0.00632 <0.00200 <0.00200 <0.00200 <0.00200 <0.00200
5/19/2011 0.145 NT 2.44 0.0146 <0.00200 0.00276 <0.00200 <0.00200 <0.00200
11/1/2011 0.0807 NT 4.09 0.00374 <0.00200 <0.00200 <0.00200 <0.00200 <0.00200
5/17/2012 <0.0200 NT 2.61 0.00431 <0.00200 <0.00200 <0.00200 <0.00200 <0.00200
11/5/2012 0.0417 NT 2.12 0.00382 <0.00200 <0.00200 0.00810 <0.00200 <0.00200
5/7/2013 0.0348 NT 1.33 0.0130 <0.00200 <0.00200 <0.00200 0.00234 <0.00200
11/18/2013 0.0272 NT 7.59 0.00294 <0.00200 <0.00200 <0.00200 <0.00200 <0.00200
5/7/2014 0.0763 NT 3.41 0.00936 <0.00200 0.00223 <0.00200 <0.00200 <0.00200
11/4/2014 <0.200 NT 10.2 <0.0100 <0.0200 <0.0200 <0.0200 <0.0200 <0.0200
5/11/2015 0.0807 NT 4.12 0.00322 <0.00200 <0.00200 <0.00200 <0.00200 <0.00200
11/11/2015 0.0950 NT 4.31 0.00632 <0.00200 0.0030 <0.00200 <0.00200 <0.00200
5/11/2016 0.0963 NT 2.68 0.0111 <0.00200 0.00317 <0.00200 <0.00200 <0.00200
1/10/2017 <0.200 NT 18.6 0.0102 <0.0200 <0.0200 <0.0200 <0.0200 <0.0200
5/11/2017 0.0336 NT 9.87 0.00637 <0.00200 0.00275 <0.00200 <0.00200 <0.00200
11/8/2017 0.115 NT 6.40 0.0102 <0.00200 0.00257 0.00204 <0.00200 <0.00200
5/14/2018 <0.00200 NT 2.27 0.00242 <0.00200 <0.00200 <0.00200 <0.00200 <0.00200
11/6/2018 0.0798 NT 1.82 0.00751 <0.00200 0.00232 <0.00200 <0.00200 <0.00200
7/9/2019 <0.200 NT 9.69 <0.0100 <0.0200 <0.0200 <0.0200 <0.0200 <0.0200
11/6/2019 0.0694 NT 16.6 0.0141 <0.00200 0.00300 <0.00200 <0.00200 <0.00200
5/7/2020 0.0688 NT 40.8 0.00294 <0.00200 <0.00200 <0.00200 <0.00200 <0.00200
11/2/2020
5/5/2021 0.0422 NT 2.73 0.00595 <0.00200 0.00289 <0.00200 <0.00200 <0.00200
11/11/2021 <0.200 NT 1.37 0.0148 <0.0200 <0.0200 <0.0200 <0.0200 <0.0200
5/12/2022 <0.125 NT 5.8 0.011 <0.012 <0.012 <0.012 <0.012 <0.005
11/18/2022 <0.125 NT 18.8 0.024 <0.012 <0.012 <0.012 <0.012 <0.005
5/11/2023 <0.125 NT 57.9 <0.005 <0.012 <0.012 <0.012 <0.012 <0.005
11/2/2023 <0.125 NT 49.9 <0.005 <0.012 <0.012 <0.012 <0.012 <0.005
5/10/2024 <0.125 NT 22.8 <0.005 <0.012 <0.012 <0.012 <0.012 <0.005
INITIAL SCREENING LEVELS 1 1 1 0.005 1 0.7 10 0.7 0.2
Well Obstructed No Sample Collected
Well not sampled - buried beneath 1 foot of snow
Not sampled due to surface water running into well
0.3
1.4
1.5
Sheen on water table prior to purging and sampling
0.048
0.49
0.83
0.16
NT
0.17
TABLE 2
SUMMARY OF GROUNDWATER CHEMICAL ANALYSIS
C-40 TOP STOP
VERNAL, UTAH
(all values in mg/L)
Well Sample TPH Benzene Toluene Ethyl-Total Naphtha-MTBE
Number Date GRO DRO Extract (DRO)benzene Xylenes lene
TPH Purge
MW-7 11/10/1996 <2.0 <0.002 <0.002 <0.002 <0.002 <0.004 NT
4/29/1997 <2.0 <0.002 <0.002 <0.002 <0.002 0.005 <0.002
7/30/1997 <4.0 <0.002 <0.002 <0.002 <0.002 <0.004 <0.002
10/15/1997 <2.0 <0.002 <0.002 <0.002 <0.002 <0.004 <0.002
1/15/1998 <4.0 <0.001 <0.002 <0.002 <0.002 <0.004 <0.002
1/25/2008
5/30/2008
4/15/2009
11/13/2009 Well not located - paved over
4/27/2010 Well not located - paved over
11/2/2010 Well not located - paved over
MW-8 11/10/1996 2 <0.002 <0.002 <0.002 <0.002 <0.004 NT
4/29/1997 <2.0 <0.002 <0.002 <0.002 <0.002 <0.004 <0.002
7/30/1997 <4.0 <0.002 <0.002 <0.002 <0.002 <0.004 <0.002
10/15/1997 <2.0 <0.002 <0.002 <0.002 <0.002 <0.004 <0.002
MW-9 11/10/1996 <2.0 <0.002 <0.002 <0.002 <0.002 <0.004 NT
4/29/1997 <2.0 <0.002 <0.002 <0.002 <0.002 <0.004 <0.002
7/30/1997 <4.0 <0.002 <0.002 <0.002 <0.002 <0.004 <0.002
10/15/1997 <2.0 <0.002 <0.002 <0.002 <0.002 <0.004 <0.002
1/15/1998 <4.0 <0.002 <0.002 <0.002 <0.002 <0.004 <0.002
MW-10 11/10/1996 <2.0 <0.002 <0.002 <0.002 <0.002 <0.004 NT
4/29/1997 <2.0 <0.002 <0.002 <0.002 <0.002 <0.004 <0.002
7/30/1997 <4.0 <0.002 <0.002 <0.002 <0.002 <0.004 <0.002
10/15/1997 <2.0 <0.002 <0.002 <0.002 <0.002 <0.004 <0.002
1/15/1998 <4.0 <0.002 <0.002 <0.002 <0.002 <0.004 <0.002
MW-11 11/10/1996 <2.0 <0.002 <0.002 <0.002 <0.002 <0.004 NT
4/29/1997 <2.0 <0.002 <0.002 <0.002 <0.002 <0.004 <0.002
7/30/1997 <4.0 <0.002 <0.002 <0.002 <0.002 <0.004 <0.002
10/15/1997 <2.0 <0.002 <0.002 <0.002 <0.002 <0.004 <0.002
1/15/1998 <4.0 <0.002 <0.002 <0.002 <0.002 <0.004 <0.002
INTERIM CLEANUP LEVELS 10 10 10 0.005 1 0.7 10 0.7**0.2
Well not sampled - buried beneath 1 foot of snow
<0.02
<0.02
<0.02
NT
<0.02
<0.02
NT
<0.02
<0.02
<0.02
<0.02
<0.02
<0.02
<0.02
<0.02
<0.02
<0.02
NT
<0.02
<0.02
<0.02
NT
Well not located - paved over
Well not located - paved over
NT
0.11
TABLE 2
SUMMARY OF GROUNDWATER CHEMICAL ANALYSIS
C-40 TOP STOP
VERNAL, UTAH
(all values in mg/L)
Well Sample TPH Benzene Toluene Ethyl-Total Naphtha-MTBE
Number Date GRO DRO Extract (DRO)benzene Xylenes lene
TPH Purge
MW-12 10/17/1997 NT 3.7E 2.3E 1.1E 4.8E 0.35 <0.01
1/15/1998 43 4.6E 1.5 1.2 8.6 0.38 <0.02
8/25/1998 NT 4.4E 1.1E 1.3E 6.3E 0.39 <0.02
11/18/1998 NT 8.5E 1.3 1.6 8 0.49 <0.01
1/5/1999 NT 7.7E 1.3 1.5 8.1 0.29 <0.01
4/5/1999 NT 0.54E 0.35E 0.26E 0.91E 0.30E 0.0099
7/1/1999 NT 1.6E 0.38 0.56 4.0E 0.37 <0.01
10/14/1999 NT 2.1E 0.11 0.55 0.13E 0.21E <0.01
1/28/2000 NT 0.37 0.035 0.15 0.65 0.11 <0.02
4/27/2000 6.9 0.15 NT 0.93E 0.093 0.29E 0.99E 0.15 <0.002
7/10/2000 19 1.2 NT 1.8 0.049 0.22 1.6 0.18 <0.020
11/16/2000 0.055 0.035 NT 0.0022 <0.002 <0.002 <0.002 <0.004 <0.002
1/11/2001 0.2 <0.02 NT 0.0053 <0.002 <0.002 0.0086 0.0022 <0.002
4/5/2001 0.093 <0.02 NT 0.0036 <0.002 <0.002 0.0045 <0.002 <0.002
7/18/2001 0.92 0.072 NT 0.088 0.0063 0.007 0.081 0.0066 <0.002
10/26/2001 0.1 <0.020 NT 0.0037 <0.002 <0.002 0.008 <0.002 <0.002
1/30/2002 <0020 <0.020 NT <0.0010 <0.002 <0.002 <0.002 <0.002 <0.002
4/4/2002 <0020 NT <5.0 <0.0020 <0.0010 <0.0020 <0.0020 <0.0020 <0.0020
12/4/2002
5/14/2003 0.066 NT <2.0 <0.001 <0.001 <0.001 <0.003 <0.001 <0.001
1/7/2004 0.077 <0.020 NT 0.0038 <0.0020 <0.0020 <0.0020 0.0050 <0.0020
5/5/2004 0.11 <0.020 NT 0.069 0.0048 <0.0020 <0.0020 <0.0020 <0.0020
12/15/2004 <0.020 <0.020 NT <0.0010 <0.0020 <0.0020 <0.0020 <0.0020 <0.0020
6/23/2005 1.8 0.025 NT 1.1 0.016 0.028 0.088 0.0065 0.0027
12/15/2005 2.2 <0.20 NT 1.6 0.024 0.041 0.16 <0.020 <0.020
6/13/2006 2.7 <0.020 NT 1.8 0.023 0.063 0.22 0.011 <0.0020
11/8/2006 3.9 <0.20 NT 2.8 0.022 0.11 0.41 0.033 <0.020
5/3/2007 3.8 0.037 NT 2.3 0.0052 0.10 0.31 0.016 <0.0020
1/25/2008
5/30/2008 1.2 NT 1.6 0.7 0.0048 0.03 0.073 0.002 <0.0020
10/24/2008 1.8 NT 1.2 0.67 0.008 0.04 0.13 0.006 <0.0020
4/15/2009 3.2 NT 1.3 2.1 <0.020 0.15 0.26 <0.020 <0.020
11/13/2009 1.7 NT 0.72 0.49 0.0052 0.072 0.13 0.013 <0.002
4/27/2010 0.87 NT 0.88 0.40 0.0032 0.087 0.10 0.012 <0.0020
11/2/2010 1.60 NT 1.22 1.03 0.00858 0.0935 0.174 0.0134 <0.00200
5/20/2011 2.40 NT 1.41 1.01 0.0134 0.138 0.253 0.0277 <0.00200
11/2/2011 2.13 NT 2.07 1.17 0.0155 0.153 0.280 0.0221 <0.00200
5/18/2012 2.13 NT 2.46 1.14 0.0149 0.210 0.292 0.0403 <0.00200
11/6/2012 2.66 NT 1.26 1.15 0.0192 0.149 0.280 0.0473 <0.00200
5/7/2013 1.63 NT 1.10 0.956 0.0118 0.165 0.207 0.0234 <0.00200
11/18/2013 1.83 NT 1.55 0.709 0.0199 0.140 0.247 0.0158 <0.00200
5/8/2014 1.33 NT 1.41 0.624 0.00846 0.126 0.103 0.0173 <0.00200
11/4/2014 2.19 NT 1.25 0.890 0.0359 0.178 0.362 <0.0200 <0.0200
5/12/2015 2.25 NT 1.05 1.05 0.0246 0.179 0.356 <0.0200 <0.0200
11/11/2015 1.55 NT 1.30 0.67 0.0125 0.215 0.256 0.0495 <0.00200
5/11/2016 1.73 NT 0.981 0.735 0.0178 0.185 0.264 0.0253 <0.00200
1/11/2017 1.40 NT 0.866 0.500 0.00655 0.216 0.0898 0.0230 <0.00200
5/12/2017 1.10 NT 0.732 0.223 0.00640 0.178 0.163 0.0186 <0.00200
11/9/2017 0.784 NT 0.601 0.250 0.00501 0.152 0.0498 0.0272 <0.00200
5/15/2018 0.933 NT 0.817 0.267 0.00539 0.0936 0.0362 0.0207 <0.00200
11/6/2018 1.66 NT 0.781 0.565 0.0164 0.236 0.108 0.0217 <0.00200
7/9/2019 1.48 NT <0.494 0.137 0.00647 0.105 0.120 0.0126 <0.00200
11/6/2019 0.296 NT 2.98 0.0578 <0.00200 0.0364 0.00784 0.00418 <0.00200
5/8/2020 0.700 NT 1.23 0.121 <0.00200 0.0950 0.0173 0.00258 <0.00200
11/3/2020 1.24 NT 0.944 0.297 0.00649 0.0993 0.0328 0.00598 <0.00200
5/5/2021 0.838 NT <0.507 0.334 0.00302 0.136 0.0180 0.0152 <0.00200
11/12/2021 1.05 NT 1.33 0.331 0.00910 0.122 0.0623 0.00768 <0.00200
5/12/2022 1.05 NT 4.2 0.434 <0.012 0.157 0.030 0.018 <0.00200
11/18/2022 1.16 NT 3.4 0.248 <0.012 0.097 0.037 0.013 <0.005
5/11/2023 1.09 NT 2.5 0.094 <0.012 0.084 0.039 <0.012 <0.005
11/2/2023 0.392 NT 3.8 0.173 <0.012 0.092 <0.012 <0.012 <0.005
5/10/2024 0.921 NT 4.1 0.165 <0.012 0.114 0.020 <0.012 <0.005
INTERIM CLEANUP LEVELS 10 10 10 0.005 1 0.7 10 0.7**0.2
Well not sampled - top of well frozen solid
17
2.5
10.25
Not sampled
25
41
36
56
20
28
TABLE 2
SUMMARY OF GROUNDWATER CHEMICAL ANALYSIS
C-40 TOP STOP
VERNAL, UTAH
(all values in mg/L)
Well Sample TPH Benzene Toluene Ethyl-Total Naphtha-MTBE
Number Date GRO DRO Extract (DRO)benzene Xylenes lene
TPH Purge
MW-13 10/17/1997 NT 0.2 <0.010 0.1 0.39 0.25 0.011
1/15/1998 9.7 0.18 <0.02 0.076 0.18 0.21 <0.02
8/25/1998 NT 0.18E <0.002 0.13E 0.24E 0.26E <0.02
11/18/1998 NT 0.12 <0.050 0.091 0.22 0.2 <0.05
1/5/1999 NT 0.1 <0.02 0.11 0.22 0.15 <0.02
4/5/1999 NT 0.088 <0.002 0.059 0.086 0.097 0.016
7/1/1999 NT 0.075 <0.002 0.035 0.032 0.05 0.0088
10/14/1999 NT 0.099 <0.002 0.04 0.046 0.062 0.013
1/28/2000 1.9 NT 0.087 <0.020 0.034 0.039 <0.040 <0.020
4/27/2000 2.0 6.7 NT 0.11 <0.02 0.044 0.052 0.064 <0.02
7/10/2000 1.2 0.063 NT 0.071 <0.002 0.029 0.021 0.023 0.0098
11/16/2000
1/11/2001
4/5/2001 2.8 0.18 NT 0.066 <0.002 0.05 0.11 0.086 0.0077
7/18/2001
1/29/2002
1/30/2002 0.67 0.036 NT 0.1 <0.002 0.052 0.12 0.11 0.012
4/4/2002 1.6 NT 5.1 0.079 <0.002 0.038 0.11 0.12 0.0087
6/25/2002
12/4/2002
5/14/2003
1/6/2004 Not sampled due to 0.97 feet of free product in well
5/4/2004 Not sampled due to 1.41 feet of free product in well
12/14/2004
6/22/2005 Not sampled due to 0.31 feet of free product in well
12/15/2005 Not sampled due to 0.33 feet of free product in well
6/13/2006 Not sampled due to 0.14 feet of free product in well
11/8/2006
5/2/2007
1/25/2008
5/30/2008
10/24/2008
4/15/2009 1.3 NT 2600 0.1 <0.0020 0.064 <0.0020 0.11 0.021
11/13/2009 Not sampled due to 0.31 feet of free product in well
4/27/2010 0.47 NT 360 0.14 <0.0020 0.054 <0.0020 0.083 0.02
11/2/2010 0.464 NT 780 0.0821 <0.00200 0.0456 0.00360 0.0995 0.0200
5/20/2011 0.392 NT 89.1 0.0712 <0.0200 0.0389 <0.0200 0.0682 <0.0200
11/2/2011 0.342 NT 127 0.0830 <0.0200 0.0506 <0.0200 0.0657 <0.0200
5/17/2012 0.286 NT 52.6 0.0851 <0.0200 0.0466 <0.0200 0.0606 <0.0200
11/6/2012 <0.200 NT 51.9 0.0607 <0.0200 0.0322 <0.0200 0.0909 <0.0200
5/7/2013 0.342 NT 2.57 0.101 <0.0200 0.0558 <0.0200 0.0716 0.0236
11/18/2013 0.486 NT 13.5 0.120 <0.0200 0.0702 <0.0200 0.0829 <0.0200
5/8/2014 0.625 NT 31.8 0.114 <0.0200 0.0644 <0.0200 0.105 <0.0200
11/4/2014 0.441 NT 19.9 0.111 <0.0200 0.0754 <0.0200 0.102 <0.0200
5/12/2015 0.499 NT 6.91 0.0975 <0.0200 0.0617 <0.0200 0.104 <0.0200
11/11/2015 0.626 NT 8.35 0.1100 <0.00200 0.0988 <0.00200 0.173 0.00623
5/10/2016 0.455 NT 63.1 0.0790 <0.0200 0.0666 <0.0200 0.103 <0.0200
1/11/2017 0.451 NT 6.21 0.0879 <0.0200 0.0777 <0.0200 0.0957 <0.0200
5/12/2017 0.582 NT 4.70 0.103 <0.00200 0.0932 <0.00200 0.118 0.00611
11/8/2017 0.484 NT 6.88 0.0712 <0.00200 0.0683 <0.00200 0.0925 0.00625
5/14/2018 0.472 NT 21.40 0.0652 <0.0200 0.0526 <0.0200 0.0884 <0.0200
11/6/2018 0.562 NT 3.27 0.0709 <0.00200 0.0784 <0.00200 0.107 0.00481
7/9/2019 0.697 NT 489 0.0684 <0.0200 0.0628 <0.0200 0.185 <0.0200
11/6/2019 0.467 NT 4.80 0.0663 <0.00200 0.0713 <0.00200 0.0954 0.00291
5/7/2020 0.508 NT 16.3 0.0784 <0.0200 0.0725 <0.0200 0.0781 <0.0200
11/2/2020 0.462 NT 10.6 0.0511 <0.00200 0.0584 <0.00200 0.0641 <0.00200
5/5/2021 0.479 NT 20.3 0.0677 <0.00200 0.0754 <0.00200 0.0941 0.00293
11/12/2021 0.560 NT 55.1 0.0586 <0.00200 0.0719 <0.00200 0.118 0.00342
5/12/2022 0.555 NT 31.9 0.066 <0.012 0.079 <0.012 0.109 <0.005
11/18/2022 0.652 NT 175 0.037 <0.012 0.050 <0.012 0.094 <0.005
5/11/2023 2.16 NT 100 0.042 <0.012 0.087 <0.012 <0.012 <0.005
11/2/2023 0.283 NT 18.8 0.035 <0.012 0.033 <0.012 <0.012 <0.005
5/9/2024 0.741 NT 123 0.054 <0.012 0.063 <0.012 0.060 <0.005
INTERIM CLEANUP LEVELS 10 10 10 0.005 1 0.7 10 0.7**0.2
Not sampled due to 0.10 feet of free product in well
Not sampled due to 0.10 feet of free product in well
Not sampled due to 1.12 feet of free product in well
Not sampled due to 0.12 feet of free product accumulation
Not sampled due to 0.06 feet of free product accumulation
Prior to sampling measured 0.375 inch of free product
Not sampled due to free product in well
Not sampled due to 0.27 feet of free product in well
Not sampled due to 0.15 feet of free product in well
Not sampled due to 0.05 feet of free product in well
Not sampled due to 0.72 feet of free product in well
Not sampled due to 0.17 feet of free product accumulation
0.55
16
2.2
5.9
3.1
3.1
7.4
3.7
Not sampled due to 0.24 feet of free product in well
TABLE 2
SUMMARY OF GROUNDWATER CHEMICAL ANALYSIS
C-40 TOP STOP
VERNAL, UTAH
(all values in mg/L)
Well Sample TPH Benzene Toluene Ethyl-Total Naphtha-MTBE
Number Date GRO DRO Extract (DRO)benzene Xylenes lene
TPH Purge
MW-14 10/17/1997 NT 2.2E 4.2E 1.3E 4.0E 0.36 <0.01
1/15/1998 46 2.4E 4.0E 1.4E 5.9E 0.42 <0.01
8/25/1998 NT 2.9E 5.1E 1.5E 6.2E 0.37 <0.02
11/18/1998 NT 4.3 6.9E 1.7 7.3 0.42 <0.01
1/5/1999 NT 0.94E 1.3E 0.49E 1.3E 0.40E <0.002
7/1/1999 NT 0.38E 0.55E 0.35E 1.5E 0.072 <0.002
10/14/1999 NT 2.6E 2.8E 1.1E 3.9E 0.45 <0.020
1/28/2000 NT 3.5E 3.0E 1.4 6.6E 0.34E <0.020
4/27/2000 25 0.24 NT 2.5E 3.7E 0.97 4.7 0.24 <0.020
7/10/2000 <0.020 <0.020 NT <0.001 <0.002 <0.002 <0.002 <0.004 <0.002
1/11/2001 4.6 0.042 NT 0.33E 0.22E 0.12 0.72 0.039 <0.002
4/5/2001 17 0.14 NT 2.0E 1.1 0.5 2.2 0.19 <0.010
7/18/2001 38 <1.0 NT 2.9 4.1 0.98 8.5 0.46 <0.10
10/26/2001 12 0.19 NT 2 1.4 0.13 4.7 0.6 <0.002
1/29/2002
1/30/2002 22 <1.0 NT 4.8 4.8 0.82 6.9 0.23 <0.10
4/4/2002 25 NT 17 2.8 2.5 0.44 7.8 0.41 <0.020
6/25/2002
12/4/2002
5/14/2003 23.8 NT 5.1 1.89 1.22 0.428 3.18 <0.001 <0.001
1/6/2004 Not sampled due to 0.02 feet of free product in well
5/6/2004 8.2 0.21 NT 0.84 0.42 0.28 1.2 0.12 <0.020
12/15/2004 9.0 0.23 NT 0.43 0.48 0.41 2.2 0.11 <0.020
6/23/2005 8.2 <0.20 NT 0.56 0.14 0.36 1.3 0.10 <0.020
12/15/2005 7.8 <0.20 NT 0.61 0.12 0.35 1.3 0.098 <0.020
6/13/2006 7.2 <0.40 NT 0.52 0.11 0.32 1.4 0.100 <0.040
11/8/2006 7.4 <0.20 NT 0.67 0.073 0.34 1.3 0.090 <0.020
5/3/2007 15 <0.40 NT 0.81 0.077 0.41 1.5 0.096 <0.040
1/25/2008
5/30/2008 23 NT 63 0.99 0.062 0.52 2.1 0.140 <0.020
10/24/2008 14 NT 11 1.2 0.05 0.46 1.6 0.130 <0.020
4/15/2009 6.4 NT 12 1.2 0.044 0.4 1.3 0.280 <0.020
11/13/2009 11 NT 5.6 1.0 0.044 0.39 1.1 0.16 <0.02
4/27/2010 5.6 NT 18 1.2 0.051 0.43 1.2 0.17 <0.0020
11/2/2010 6.32 NT 7.78 1.02 0.0368 0.362 1.06 0.165 <0.0200
5/19/2011 9.23 NT 7.12 0.650 <0.0200 0.229 0.496 0.0690 <0.0200
11/2/2011 3.89 NT 4.69 0.853 0.0219 0.257 0.361 0.0950 <0.00200
5/18/2012 2.50 NT 8.98 0.893 <0.0200 0.273 0.257 0.0666 <0.0200
11/5/2012 2.98 NT 2.95 0.751 <0.0200 0.257 0.213 0.0896 <0.0200
5/7/2013 3.35 NT 1.32 1.08 0.0109 0.276 0.146 0.0659 <0.00200
11/18/2013 3.16 NT 2.34 1.00 0.0146 0.318 0.111 0.0776 <0.00200
5/7/2014 3.92 NT 3.90 1.02 <0.0200 0.348 0.105 0.105 <0.00200
11/3/2014 3.84 NT 1.86 1.00 <0.0400 0.370 0.0566 0.0922 <0.0400
5/12/2015 3.62 NT 1.99 0.987 <0.0200 0.344 0.0329 0.100 <0.0200
11/11/2015 4.90 NT 7.68 0.793 0.0137 0.488 0.0887 0.183 <0.00200
5/10/2016 3.26 NT 5.85 0.728 0.0114 0.344 0.0655 0.124 <0.00200
1/11/2017 3.67 NT 4.88 0.705 0.0111 0.404 0.0296 0.112 <0.00200
5/12/2017 3.78 NT 2.19 0.773 0.0128 0.467 0.0302 0.107 <0.00200
11/8/2017 3.68 NT 2.81 0.586 0.0134 0.428 0.0533 0.145 <0.00200
5/14/2018 3.71 NT 9.48 0.692 <0.0200 0.375 0.0493 0.123 <0.0200
11/6/2018 3.30 NT 2.87 0.788 0.0149 0.440 0.0419 0.122 <0.00200
7/9/2019 3.23 NT 36.5 1.10 <0.100 0.550 <0.100 <0.100 <0.100
11/6/2019 2.37 NT 2.21 0.332 0.00823 0.345 0.0131 0.0905 <0.00200
5/8/2020 4.76 NT 3.91 0.951 0.0198 0.568 0.0478 0.179 <0.00200
11/2/2020 4.91 NT 3.26 0.394 0.0105 0.384 0.0263 0.136 <0.00200
5/5/2021 3.48 NT 2.19 0.675 0.0101 0.354 0.0193 0.101 <0.00200
11/12/2021 3.34 NT 3.21 0.660 0.0125 0.372 0.0266 0.134 <0.00200
5/12/2022 7.01 NT 3.3 0.729 0.019 0.524 0.028 0.145 <0.005
11/18/2022 7.22 NT 12.2 0.509 0.018 0.490 0.063 0.158 <0.005
5/11/2023 29.9 NT 8.7 0.761 0.017 0.591 0.050 0.122 <0.005
11/2/2023 4.02 NT 3.4 0.421 <0.012 0.318 0.032 <0.012 <0.005
5/9/2024 9.46 NT 9.4 0.834 0.020 0.614 0.098 0.170 <0.005
INTERIM CLEANUP LEVELS 10 10 10 0.005 1 0.7 10 0.7**0.2
Not sampled due to 0.11 feet of free product in well
Well not sampled - buried beneath 6 inches of packed ice
Sheen on water table prior to purging and sampling
Not sampled due to free product in well
37
57
35
8
37
13
17
30.27
TABLE 2
SUMMARY OF GROUNDWATER CHEMICAL ANALYSIS
C-40 TOP STOP
VERNAL, UTAH
(all values in mg/L)
Well Sample TPH Benzene Toluene Ethyl-Total Naphtha-MTBE
Number Date GRO DRO Extract (DRO)benzene Xylenes lene
TPH Purge
MW-15 10/17/1997 NT 3.1E 4.2E 1.7E 6.0E 0.56 0.053
1/15/1998 41 2.3E 3.1E 1.6E 6.8E 0.57 0.031
8/25/1998 NT 3.1 3.6 1.4 7.9 1.7 <0.10
11/18/1998 NT 4.8 5.2E 1.7 7.6 0.47 <0.10
1/5/1999 NT 0.61E 0.59E 0.33E 0.92E 0.29E 0.0084
4/5/1999 NT 0.54E 0.59E 0.32E 0.92E 0.33E 0.0072
7/1/1999 NT 0.56E 0.64E 0.28E 1.5E 0.14 0.0066
10/14/1999 NT 4.8 2.9 1.3 6 0.58 <0.002
1/28/2000 NT 1.7 1.8 0.57 3 0.16 <0.020
4/27/2000 24 <1.0 NT 3.5 3.9 0.97 5.3 0.22 <0.10
7/10/2000 26 <0.20 NT 4E 3E 1.3 6.1 0.36 <0.020
11/16/2000 6.4 0.32 NT 1.4E 0.99E 0.22 1.1E 0.043 0.0047
1/11/2001
4/5/2001 22 0.92 NT 1.8E 2.0E 0.81 4.9E 0.39 <0.01
7/18/2001 29 2.4 NT 2.4 2.6 0.95 6.7 0.37 <0.20
10/26/2001 13 0.073 NT 1.9 1.6 0.49 4.9 0.5 <0.002
1/30/2002 16 0.066 NT 3.7 2.8 0.78 5.7 0.16 0.0065
4/4/2002 1.8 NT NT 0.03 0.055 0.053 0.48 0.024 <0.0020
12/4/2002
5/14/2003 43.4 NT 7.4 1.53 2.40 0.777 6.51 0.323 <0.001
1/7/2004 14 <0.20 NT 1.4 1.6 0.98 4.9 0.32 <0.020
5/5/2004 13 <0.20 NT 0.97 0.83 1 4.5 0.28 <0.020
12/15/2004 10 0.21 NT 0.65 0.58 0.42 4.4 0.15 <0.020
6/23/2005 14 <0.20 NT 1.6 1.1 0.81 5.7 0.29 <0.020
12/16/2005 12 <0.20 NT 1.3 0.86 0.77 4.9 0.25 <0.020
6/13/2006 15 <0.40 NT 1.7 1.60 0.86 6.6 0.27 <0.040
11/8/2006 9.3 <0.20 NT 0.53 0.44 0.55 3.4 0.17 <0.020
5/3/2007 14 <0.40 NT 0.91 0.43 0.82 4.1 0.20 <0.040
1/25/2008
5/30/2008 5 NT 9.7 0.17 0.06 0.15 1 0.06 <0.020
10/24/2008 11 NT 31 0.37 0.15 0.36 3 0.15 <0.020
4/15/2009 4.2 NT 8.4 0.57 0.15 0.058 2.2 0.33 <0.020
11/13/2009 5.7 NT 3.9 0.76 0.22 0.50 4.6 0.22 <0.002
4/27/2010 5.5 NT 13 0.73 0.19 0.39 2.9 0.22 <0.0020
11/2/2010 6.79 NT 15.1 0.882 0.267 0.580 3.45 0.228 <0.00200
5/20/2011 9.23 NT 9.13 0.715 0.236 0.458 3.42 0.196 <0.0200
11/2/2011 3.89 NT 5.25 0.209 0.0881 0.290 2.08 0.175 <0.00200
5/18/2012 4.04 NT 3.85 0.405 0.107 0.280 2.11 0.146 <0.00200
11/6/2012 5.15 NT 6.21 0.262 0.0563 0.289 1.53 0.131 <0.0100
5/7/2013 2.87 NT 3.55 0.319 0.0520 0.209 1.52 0.107 <0.0100
11/18/2013 2.37 NT 3.26 0.155 0.0235 0.159 0.794 0.0670 <0.00200
5/8/2014 1.69 NT 4.35 0.202 0.0317 0.125 0.614 0.0637 <0.00200
11/4/2014 1.10 NT 2.10 0.0738 <0.0400 0.0724 0.290 <0.0400 <0.0400
5/12/2015 0.841 NT 2.51 0.0731 0.00791 0.0756 0.265 0.0402 <0.00200
11/12/2015 1.480 NT 2.59 0.183 0.01980 0.1570 0.355 0.0727 <0.00200
5/11/2016 0.0353 NT <0.500 0.00282 <0.00200 <0.00200 0.00351 <0.00200 <0.00200
1/11/2017 0.667 NT 0.962 0.0621 0.0105 0.123 0.140 0.0313 <0.00200
5/12/2017 0.382 NT 1.21 0.0385 0.00570 0.0602 0.0680 0.0167 <0.00200
11/9/2017 0.739 NT 1.48 0.0518 0.00467 0.0654 0.0805 0.0276 <0.00200
5/15/2018 0.986 NT 4.04 0.115 0.00978 0.0751 0.100 0.0355 <0.00200
11/6/2018 0.952 NT 1.28 0.0901 0.00761 0.171 0.0869 0.0305 <0.00200
7/9/2019 0.536 NT 1.12 0.0479 0.00364 0.0777 0.0346 0.0185 <0.00200
11/6/2019 0.708 NT 1.85 0.115 0.00740 0.0772 0.0631 0.0162 <0.00200
5/8/2020 0.625 NT 2.19 0.0518 0.00440 0.123 0.0889 0.0247 <0.00200
11/3/2020 1.15 NT 3.74 0.159 0.00895 0.109 0.100 0.0214 <0.00200
5/5/2021 1.05 NT 1.74 0.142 0.0146 0.183 0.192 0.0423 <0.00200
11/12/2021 0.764 NT <0.492 0.0566 0.00428 0.177 0.0762 0.0194 <0.00200
5/12/2022 0.561 NT 1.8 0.039 <0.012 0.101 0.043 0.020 <0.005
11/18/2022 1.23 NT 7.4 0.034 <0.012 0.109 0.058 0.021 <0.005
5/11/2023 1.07 NT 5.6 0.008 <0.012 0.025 0.019 <0.012 <0.005
11/2/2023 <0.125 NT 2.6 0.048 <0.012 0.016 <0.012 <0.012 <0.005
5/10/2024 1.10 NT 4.5 0.034 <0.012 0.083 0.043 <0.012 <0.005
INTERIM CLEANUP LEVELS 10 10 10 0.005 1 0.7 10 0.7**0.2
50
20
74
18
Well not sampled - top of well frozen solid
23
11
Not measured due to 0.08 feet of free product accumulation
Not measured due to 0.01 feet of free product accumulation
17
35
81
TABLE 2
SUMMARY OF GROUNDWATER CHEMICAL ANALYSIS
C-40 TOP STOP
VERNAL, UTAH
(all values in mg/L)
Well Sample TPH Benzene Toluene Ethyl-Total Naphtha-MTBE
Number Date GRO DRO Extract (DRO)benzene Xylenes lene
TPH Purge
Top Stop 1/5/1999 NT <0.001 <0.002 <0.002 <0.002 <0.004 <0.002
Men's Restroom 7/12/1999 NT <0.001 <0.002 <0.002 <0.002 <0.004 <0.002
10/14/1999 NT <0.001 <0.002 <0.002 <0.002 <0.004 <0.002
1/28/2000 NT <0.001 <0.002 <0.002 <0.002 <0.004 <0.002
4/27/2000 <0.02 <0.02 NT <0.001 <0.002 <0.002 <0.002 <0.004 <0.002
11/16/2000 <0.02 <0.02 NT <0.001 <0.002 <0.002 <0.002 <0.004 <0.002
4/5/2001 <0.02 <0.02 NT <0.001 <0.002 <0.002 <0.002 <0.004 <0.002
12/4/2002
see note 2 5/6/2003 <1.0 NT NT <0.001 <0.001 <0.001 <0.001 <0.001 <0.001
5/14/2003 <0.05 NT <2.0 <0.001 <0.001 <0.001 <0.003 <0.001 <0.001
McCarell Garage 1/5/1999 NT <0.001 <0.002 <0.002 <0.002 <0.004 <0.002
Yard Hydrant 7/12/1999 NT 0.0042 <0.002 <0.002 <0.002 <0.004 <0.002
10/14/1999 NT <0.001 <0.002 <0.002 <0.002 <0.004 <0.002
4/27/2000 <0.02 <0.02 NT <0.001 <0.002 <0.002 <0.002 <0.004 <0.002
11/16/2000 0.097 <0.02 NT 0.0014 <0.002 <0.002 0.016 0.0035 <0.002
4/5/2001 <0.02 <0.02 NT <0.001 <0.002 <0.002 <0.002 <0.004 <0.002
12/4/2002
5/14/2003
1/8/2004 <0.020 <0.020 NT <0.0010 <0.0020 <0.0020 <0.0020 <0.0020 <0.0020
5/6/2004 <0.020 <0.020 NT <0.0010 <0.0020 <0.0020 <0.0020 <0.0020 <0.0020
12/15/2004 <0.020 <0.020 NT <0.0010 <0.0020 <0.0020 <0.0020 <0.0020 <0.0020
U-Haul Bathroom 1/28/2000 NT <0.001 <0.002 <0.002 <0.002 <0.004 <0.002
Sink 4/27/2000 <0.02 <0.02 NT <0.001 <0.002 <0.002 <0.002 <0.004 <0.002
see note 2 5/6/2003 <1.0 NT NT <0.001 <0.001 <0.001 <0.001 <0.001 <0.001
(Basin Propane Sink)1/8/2004 <0.020 <0.020 NT <0.0010 <0.0020 <0.0020 <0.0020 <0.0020 <0.0020
5/7/2004 <0.020 <0.020 NT <0.0010 <0.0020 <0.0020 <0.0020 <0.0020 <0.0020
12/15/2004 <0.020 <0.020 NT <0.0010 <0.0020 <0.0020 <0.0020 <0.0020 <0.0020
OWS Effluent 5/12/2003 <0.05 NT <2.0 <0.001 <0.001 <0.001 <0.003 <0.001 <0.001
7/8/2008 0.12 4.2 NT 0.0014 <0.0020 <0.0020 <0.0020 0.0041 <0.0020
4/15/2009 0.065 NT 12 <0.0010 <0.0020 <0.0020 <0.0020 0.0077 <0.0020
11/13/2009 <0.02 NT 82 <0.001 <0.002 <0.002 <0.002 <0.002 <0.002
5/20/2011 0.0481 NT 3.21 <0.00100 <0.00200 <0.00200 <0.00200 0.00681 0.00214
11/1/2011 <0.0200 NT 10.5 <0.00100 <0.00200 <0.00200 <0.00200 <0.00200 <0.00200
5/18/2012 OWS was dry and filled with debris - no sample was collected
11/5/2012 <0.200 NT NT <0.0100 <0.0200 <0.0200 <0.0200 0.0702 <0.0200
5/7/2013 <0.200 NT 18.4 <0.0100 <0.0200 <0.0200 <0.0200 0.0247 <0.0200
11/18/2013 0.0483 NT 11.3 <0.00100 <0.00200 <0.00200 <0.00200 <0.00200 <0.00200
5/8/2014 0.0716 NT 5.27 <0.00100 <0.00200 <0.00200 <0.00200 0.00584 <0.00200
11/3/2014 0.0234 NT 1.73 <0.00100 <0.00200 <0.00200 <0.00200 <0.00200 <0.00200
5/11/2015 <0.0200 NT 1.85 <0.00100 <0.00200 <0.00200 <0.00200 <0.00200 <0.00200
11/12/2015 0.0208 NT 19.6 <0.00100 <0.00200 <0.00200 <0.00200 <0.00200 <0.00200
5/11/2016 <0.0200 NT 2.75 <0.00100 <0.00200 <0.00200 <0.00200 <0.00200 <0.00200
1/11/2017 0.0366 NT 1.91 <0.00100 <0.00200 <0.00200 <0.00200 <0.00200 <0.00200
5/11/2017 <0.0200 NT 1.54 <0.00100 <0.00200 <0.00200 <0.00200 <0.00200 <0.00200
11/9/2017 0.0278 NT 1.36 <0.00100 <0.00200 <0.00200 <0.00200 <0.00200 <0.00200
5/15/2018 <0.0200 NT 1.53 <0.00100 <0.00200 <0.00200 <0.00200 <0.00200 <0.00200
11/6/2018 0.0510 NT 2.56 <0.00100 <0.00200 <0.00200 <0.00200 0.00581 <0.00200
7/9/2019 <0.0200 NT 3.31 <0.00100 <0.00200 <0.00200 <0.00200 <0.00200 <0.00200
11/6/2019 0.0238 NT 3.81 <0.00100 <0.00200 <0.00200 <0.00200 <0.00200 <0.00200
5/8/2020 <0.0200 NT 3.48 <0.00100 <0.00200 <0.00200 <0.00200 <0.00200 <0.00200
11/2/2020 0.0300 NT 1.41 <0.00100 <0.00200 <0.00200 <0.00200 <0.00200 <0.00200
5/5/2021 <0.0200 NT <0.507 <0.00100 <0.00200 <0.00200 <0.00200 <0.00200 <0.00200
11/12/2021 <0.200 NT 1.56 <0.0100 <0.0200 <0.0200 <0.0200 <0.0200 <0.0200
5/12/2022 <0.125 NT 4.5 <0.005 <0.012 <0.012 <0.012 <0.012 <0.005
11/17/2022 <0.125 NT 3.8 <0.005 <0.012 <0.012 <0.012 <0.012 <0.005
5/11/2023 <0.125 NT 4.4 <0.005 <0.012 <0.012 <0.012 <0.012 <0.005
11/2/2023 <0.125 NT 4.8 <0.005 <0.012 <0.012 <0.012 <0.012 <0.005
5/10/2024 <0.125 NT 10.0 <0.005 <0.012 <0.012 0.020 <0.012 <0.005
OWS Influent 5/12/2003 <0.05 NT <2.0 <0.001 <0.001 <0.001 <0.003 <0.001 <0.001
INTERIM CLEANUP LEVELS 10 10 10 0.005 1 0.7 10 0.7**0.2
** Naphthalene Recommended Cleanup Level changed to Initial Screening Level of 0.7 mg/L by Utah DEQ.
1 = Analysis by DEQ state laboratory, reported as sample MW-13 on chain-of-custody
2 = Analysis by DEQ state laboratory
3 = Sample collected prior to purging well. Sample contained a small amount of free product.
NT = Not tested
<0.02
Not measured
<0.02
<0.02
<0.02
<0.020
Not measured
<0.02
0.064
<0.02
Not measured

Appendix A
Laboratory Analytical Results
The analyses presented on this report were performed in accordance with the
National Environmental Laboratory Accreditation Program (NELAP) unless
noted in the comments, flags, or case narrative. If the report is to be used for
regulatory compliance, it should be presented in its entirety, and not be
altered.
Client Service Contact: 801.262.7299
Wasatch Environmental
Attn: Mike Cronin
2410 West California Avenue
Salt Lake City, UT 84104
Work Order: 24E0862
Project: Vernal Top Stop
5/20/2024
Approved By:
Melissa Connolly, Project Manager
9632 South 500 West Sandy, Utah 84070
Serving the Intermountain West since 1953
801.262.7299 Main 866.792.0093 Fax www.ChemtechFord.com
Page 1 of 11
xx
Chemtech-Ford Laboratories
Serving the Intermountain West Since 1953
Certificate of Analysis
9632 South 500 West
Sandy, UT 84070
O:[phone] F: [phone]
www.ChemtechFord.com
Wasatch Environmental
Mike Cronin
2410 West California Avenue
Salt Lake City, UT 84104
PO#:
Receipt:
Date Reported:
Project Name:
1241-004D
5/10/24 14:45 @ 0.8 °C
5/20/2024
Vernal Top Stop
Sample ID: MW-3
Lab ID: 24E0862-01Matrix: Water
Flag(s)Units
Analysis
Date/Time
Date Sampled: 5/9/24 14:40
Preparation
Date/Time
Sampled By: Jacob Scott
Minimum
Reporting
Limit MethodResult
MBTEXn
mg/L 5/10/245/10/240.005 EPA 8260D/5030BNDBenzene
mg/L 5/10/245/10/240.012 EPA 8260D/5030BNDEthylbenzene
mg/L 5/10/245/10/240.005 EPA 8260D/5030BNDMethyl tert-Butyl Ether (MTBE)
mg/L 5/10/245/10/240.012 EPA 8260D/5030BNDNaphthalene
mg/L 5/10/245/10/240.012 EPA 8260D/5030BNDToluene
mg/L 5/10/245/10/240.012 EPA 8260D/5030BNDXylenes, total
Gasoline Range
mg/L 5/10/245/10/240.125 EPA 8260B/C /5030A/[CALC]NDGasoline Range Organics
Diesel Range
mg/L 5/13/245/13/241.0 EPA 8015 C4.1Diesel Range Organics
Project Name: Vernal Top Stop CtF WO#: 24E0862
www.ChemtechFord.com
Page 2 of 11Page 2 of 11
xx
Chemtech-Ford Laboratories
Serving the Intermountain West Since 1953
Certificate of Analysis
9632 South 500 West
Sandy, UT 84070
O:[phone] F: [phone]
www.ChemtechFord.com
Wasatch Environmental
Mike Cronin
2410 West California Avenue
Salt Lake City, UT 84104
PO#:
Receipt:
Date Reported:
Project Name:
1241-004D
5/10/24 14:45 @ 0.8 °C
5/20/2024
Vernal Top Stop
Sample ID: MW-5
Lab ID: 24E0862-02Matrix: Water
Flag(s)Units
Analysis
Date/Time
Date Sampled: 5/9/24 15:05
Preparation
Date/Time
Sampled By: Jacob Scott
Minimum
Reporting
Limit MethodResult
MBTEXn
mg/L 5/10/245/10/240.005 EPA 8260D/5030BNDBenzene
mg/L 5/10/245/10/240.012 EPA 8260D/5030BNDEthylbenzene
mg/L 5/10/245/10/240.005 EPA 8260D/5030BNDMethyl tert-Butyl Ether (MTBE)
mg/L 5/10/245/10/240.012 EPA 8260D/5030BNDNaphthalene
mg/L 5/10/245/10/240.012 EPA 8260D/5030BNDToluene
mg/L 5/10/245/10/240.012 EPA 8260D/5030BNDXylenes, total
Gasoline Range
mg/L 5/10/245/10/240.125 EPA 8260B/C /5030A/[CALC]NDGasoline Range Organics
Diesel Range
mg/L 5/13/245/13/241.0 EPA 8015 C3.0Diesel Range Organics
Project Name: Vernal Top Stop CtF WO#: 24E0862
www.ChemtechFord.com
Page 3 of 11Page 3 of 11
xx
Chemtech-Ford Laboratories
Serving the Intermountain West Since 1953
Certificate of Analysis
9632 South 500 West
Sandy, UT 84070
O:[phone] F: [phone]
www.ChemtechFord.com
Wasatch Environmental
Mike Cronin
2410 West California Avenue
Salt Lake City, UT 84104
PO#:
Receipt:
Date Reported:
Project Name:
1241-004D
5/10/24 14:45 @ 0.8 °C
5/20/2024
Vernal Top Stop
Sample ID: MW-13
Lab ID: 24E0862-03Matrix: Water
Flag(s)Units
Analysis
Date/Time
Date Sampled: 5/9/24 15:15
Preparation
Date/Time
Sampled By: Jacob Scott
Minimum
Reporting
Limit MethodResult
MBTEXn
mg/L 5/10/245/10/240.005 EPA 8260D/5030B0.054Benzene
mg/L 5/10/245/10/240.012 EPA 8260D/5030B0.063Ethylbenzene
mg/L 5/10/245/10/240.005 EPA 8260D/5030BNDMethyl tert-Butyl Ether (MTBE)
mg/L 5/10/245/10/240.012 EPA 8260D/5030B0.060Naphthalene
mg/L 5/10/245/10/240.012 EPA 8260D/5030BNDToluene
mg/L 5/10/245/10/240.012 EPA 8260D/5030BNDXylenes, total
Gasoline Range
mg/L 5/10/245/10/240.125 EPA 8260B/C /5030A/[CALC]0.741Gasoline Range Organics
Diesel Range
mg/L 5/13/245/13/241.0 EPA 8015 C123Diesel Range Organics
Project Name: Vernal Top Stop CtF WO#: 24E0862
www.ChemtechFord.com
Page 4 of 11Page 4 of 11
xx
Chemtech-Ford Laboratories
Serving the Intermountain West Since 1953
Certificate of Analysis
9632 South 500 West
Sandy, UT 84070
O:[phone] F: [phone]
www.ChemtechFord.com
Wasatch Environmental
Mike Cronin
2410 West California Avenue
Salt Lake City, UT 84104
PO#:
Receipt:
Date Reported:
Project Name:
1241-004D
5/10/24 14:45 @ 0.8 °C
5/20/2024
Vernal Top Stop
Sample ID: MW-14
Lab ID: 24E0862-04Matrix: Water
Flag(s)Units
Analysis
Date/Time
Date Sampled: 5/9/24 15:45
Preparation
Date/Time
Sampled By: Jacob Scott
Minimum
Reporting
Limit MethodResult
MBTEXn
mg/L 5/10/245/10/240.005 EPA 8260D/5030B0.834Benzene
mg/L 5/10/245/10/240.012 EPA 8260D/5030B0.614Ethylbenzene
mg/L 5/10/245/10/240.005 EPA 8260D/5030BNDMethyl tert-Butyl Ether (MTBE)
mg/L 5/10/245/10/240.012 EPA 8260D/5030B0.170Naphthalene
mg/L 5/10/245/10/240.012 EPA 8260D/5030B0.020Toluene
mg/L 5/10/245/10/240.012 EPA 8260D/5030B0.098Xylenes, total
Gasoline Range
mg/L 5/10/245/10/240.125 EPA 8260B/C /5030A/[CALC]9.46Gasoline Range Organics
Diesel Range
mg/L 5/13/245/13/241.0 EPA 8015 C9.4Diesel Range Organics
Project Name: Vernal Top Stop CtF WO#: 24E0862
www.ChemtechFord.com
Page 5 of 11Page 5 of 11
xx
Chemtech-Ford Laboratories
Serving the Intermountain West Since 1953
Certificate of Analysis
9632 South 500 West
Sandy, UT 84070
O:[phone] F: [phone]
www.ChemtechFord.com
Wasatch Environmental
Mike Cronin
2410 West California Avenue
Salt Lake City, UT 84104
PO#:
Receipt:
Date Reported:
Project Name:
1241-004D
5/10/24 14:45 @ 0.8 °C
5/20/2024
Vernal Top Stop
Sample ID: MW-6
Lab ID: 24E0862-05Matrix: Water
Flag(s)Units
Analysis
Date/Time
Date Sampled: 5/10/24 8:30
Preparation
Date/Time
Sampled By: Jacob Scott
Minimum
Reporting
Limit MethodResult
MBTEXn
mg/L 5/10/245/10/240.005 EPA 8260D/5030BNDBenzene
mg/L 5/10/245/10/240.012 EPA 8260D/5030BNDEthylbenzene
mg/L 5/10/245/10/240.005 EPA 8260D/5030BNDMethyl tert-Butyl Ether (MTBE)
mg/L 5/10/245/10/240.012 EPA 8260D/5030BNDNaphthalene
mg/L 5/10/245/10/240.012 EPA 8260D/5030BNDToluene
mg/L 5/10/245/10/240.012 EPA 8260D/5030BNDXylenes, total
Gasoline Range
mg/L 5/10/245/10/240.125 EPA 8260B/C /5030A/[CALC]NDGasoline Range Organics
Diesel Range
mg/L 5/13/245/13/241.0 EPA 8015 C22.8Diesel Range Organics
Project Name: Vernal Top Stop CtF WO#: 24E0862
www.ChemtechFord.com
Page 6 of 11Page 6 of 11
xx
Chemtech-Ford Laboratories
Serving the Intermountain West Since 1953
Certificate of Analysis
9632 South 500 West
Sandy, UT 84070
O:[phone] F: [phone]
www.ChemtechFord.com
Wasatch Environmental
Mike Cronin
2410 West California Avenue
Salt Lake City, UT 84104
PO#:
Receipt:
Date Reported:
Project Name:
1241-004D
5/10/24 14:45 @ 0.8 °C
5/20/2024
Vernal Top Stop
Sample ID: MW-15
Lab ID: 24E0862-06Matrix: Water
Flag(s)Units
Analysis
Date/Time
Date Sampled: 5/10/24 8:50
Preparation
Date/Time
Sampled By: Jacob Scott
Minimum
Reporting
Limit MethodResult
MBTEXn
mg/L 5/10/245/10/240.005 EPA 8260D/5030B0.034Benzene
mg/L 5/10/245/10/240.012 EPA 8260D/5030B0.083Ethylbenzene
mg/L 5/10/245/10/240.005 EPA 8260D/5030BNDMethyl tert-Butyl Ether (MTBE)
mg/L 5/10/245/10/240.012 EPA 8260D/5030BNDNaphthalene
mg/L 5/10/245/10/240.012 EPA 8260D/5030BNDToluene
mg/L 5/10/245/10/240.012 EPA 8260D/5030B0.043Xylenes, total
Gasoline Range
mg/L 5/10/245/10/240.125 EPA 8260B/C /5030A/[CALC]1.10Gasoline Range Organics
Diesel Range
mg/L 5/16/245/16/241.0 EPA 8015 C4.5Diesel Range Organics
Project Name: Vernal Top Stop CtF WO#: 24E0862
www.ChemtechFord.com
Page 7 of 11Page 7 of 11
xx
Chemtech-Ford Laboratories
Serving the Intermountain West Since 1953
Certificate of Analysis
9632 South 500 West
Sandy, UT 84070
O:[phone] F: [phone]
www.ChemtechFord.com
Wasatch Environmental
Mike Cronin
2410 West California Avenue
Salt Lake City, UT 84104
PO#:
Receipt:
Date Reported:
Project Name:
1241-004D
5/10/24 14:45 @ 0.8 °C
5/20/2024
Vernal Top Stop
Sample ID: MW-12
Lab ID: 24E0862-07Matrix: Water
Flag(s)Units
Analysis
Date/Time
Date Sampled: 5/10/24 9:15
Preparation
Date/Time
Sampled By: Jacob Scott
Minimum
Reporting
Limit MethodResult
MBTEXn
mg/L 5/10/245/10/240.005 EPA 8260D/5030B0.165Benzene
mg/L 5/10/245/10/240.012 EPA 8260D/5030B0.114Ethylbenzene
mg/L 5/10/245/10/240.005 EPA 8260D/5030BNDMethyl tert-Butyl Ether (MTBE)
mg/L 5/10/245/10/240.012 EPA 8260D/5030BNDNaphthalene
mg/L 5/10/245/10/240.012 EPA 8260D/5030BNDToluene
mg/L 5/10/245/10/240.012 EPA 8260D/5030B0.020Xylenes, total
Gasoline Range
mg/L 5/10/245/10/240.125 EPA 8260B/C /5030A/[CALC]0.921Gasoline Range Organics
Diesel Range
mg/L 5/16/245/16/241.0 EPA 8015 C4.1Diesel Range Organics
Project Name: Vernal Top Stop CtF WO#: 24E0862
www.ChemtechFord.com
Page 8 of 11Page 8 of 11
xx
Chemtech-Ford Laboratories
Serving the Intermountain West Since 1953
Certificate of Analysis
9632 South 500 West
Sandy, UT 84070
O:[phone] F: [phone]
www.ChemtechFord.com
Wasatch Environmental
Mike Cronin
2410 West California Avenue
Salt Lake City, UT 84104
PO#:
Receipt:
Date Reported:
Project Name:
1241-004D
5/10/24 14:45 @ 0.8 °C
5/20/2024
Vernal Top Stop
Sample ID: OWS
Lab ID: 24E0862-08Matrix: Water
Flag(s)Units
Analysis
Date/Time
Date Sampled: 5/10/24 10:05
Preparation
Date/Time
Sampled By: Jacob Scott
Minimum
Reporting
Limit MethodResult
MBTEXn
mg/L 5/10/245/10/240.005 EPA 8260D/5030BNDBenzene
mg/L 5/10/245/10/240.012 EPA 8260D/5030BNDEthylbenzene
mg/L 5/10/245/10/240.005 EPA 8260D/5030BNDMethyl tert-Butyl Ether (MTBE)
mg/L 5/10/245/10/240.012 EPA 8260D/5030BNDNaphthalene
mg/L 5/10/245/10/240.012 EPA 8260D/5030BNDToluene
mg/L 5/10/245/10/240.012 EPA 8260D/5030B0.020Xylenes, total
Gasoline Range
mg/L 5/10/245/10/240.125 EPA 8260B/C /5030A/[CALC]NDGasoline Range Organics
Diesel Range
mg/L 5/16/245/16/241.0 EPA 8015 C10.0Diesel Range Organics
Project Name: Vernal Top Stop CtF WO#: 24E0862
www.ChemtechFord.com
Page 9 of 11Page 9 of 11
xx
Chemtech-Ford Laboratories
Serving the Intermountain West Since 1953
Certificate of Analysis
9632 South 500 West
Sandy, UT 84070
O:[phone] F: [phone]
www.ChemtechFord.com
Wasatch Environmental
Mike Cronin
2410 West California Avenue
Salt Lake City, UT 84104
PO#:
Receipt:
Date Reported:
Project Name:
1241-004D
5/10/24 14:45 @ 0.8 °C
5/20/2024
Vernal Top Stop
Report Footnotes
Abbreviations
ND = Not detected at the corresponding Minimum Reporting Limit (MRL).
1 mg/L = one milligram per liter or 1 mg/kg = one milligram per kilogram = 1 part per million.
1 ug/L = one microgram per liter or 1 ug/kg = one microgram per kilogram = 1 part per billion.
1 ng/L = one nanogram per liter or 1 ng/kg = one nanogram per kilogram = 1 part per trillion.
On calculated parameters, there may be a slight difference between summing the rounded values shown on the report
vs the unrounded values used in the calculation.
Project Name: Vernal Top Stop CtF WO#: 24E0862
www.ChemtechFord.com
Page 10 of 11Page 10 of 11
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