DERR-2024-011856

COVER PAGE
September 2024 Groundwater
Monitoring Report
Former Blanding Chevron
200 North Highway 191 Blanding, Utah
Facility ID #5000247 Release ID GFB
October 31, 2024 | Terracon Project No. AL067004
Prepared for:
Utah Department of Environmental Quality
Salt Lake City, Utah
6952 South High Tech Dr. Ste. B
Midvale, Utah 84047
P [phone]
Terracon.com
Facilities | Environmental | Geotechnical | Materials i
COVER LETTER
October 31, 2024
Utah Department of Environmental Quality
Division of Environmental Response and Remediation
195 North 1950 West
Salt Lake City, Utah 84114
Attn: Mr. Mark Crim
E:[e-mail]
Re:September 2024 Groundwater Monitoring Report
Former Blanding Chevron
200 North Highway 191
Blanding, Utah
Facility ID #5000247 Release ID GFB
Terracon Project No. AL067004
Dear Mr. Crim:
Terracon Consultants, Inc. (Terracon) is pleased to submit this September 2024
Groundwater Monitoring Report documenting a groundwater sampling event conducted at
the former Blanding Chevron facility, located at 200 North Highway 191, Blanding, Utah.
Terracon performed this work pursuant to the approved Work Assignment No. GFB-36-
TER. This work was conducted under Terracon's contract (Contract Number 216383) with
the Division of Environmental Response and Remediation (DERR).
We appreciate the opportunity to have performed these services for you. Please contact
our office at [phone] if you have questions regarding this information or if we
can provide any other services.
Sincerely,
Terracon Consultants, Inc.
Andrew Turner Craig D. Eaton
Project Manager Authorized Project Reviewer
Certified UST Consultant #CC0167
Facilities | Environmental | Geotechnical | Materials ii
Table of Contents
1.0 Introduction ................................................................................ 1
1.1 Site Description ..................................................................................... 1
1.2 Project Background ................................................................................ 1
1.3 Scope of Work ....................................................................................... 2
1.4 Standard of Care .................................................................................... 2
1.5 Additional Scope Limitations .................................................................... 2
1.6 Reliance ................................................................................................ 3
2.0 September 2024 Groundwater Sampling Event ................................ 3
3.0 Laboratory Analytical Methods ....................................................... 4
4.0 Data Evaluation ........................................................................... 5
4.1 Observations ......................................................................................... 5
4.2 Groundwater Sample Results ................................................................... 5
4.3 Quality Control ....................................................................................... 5
5.0 Findings and Conclusions .............................................................. 6
Appendices
Appendix A Exhibits
Exhibit 1:Topographic Map
Exhibit 2: Site Map
Exhibit 3: Shallow Aquifer Potentiometric Surface Map, September 2024
Exhibit 4:Deep Aquifer Potentiometric Surface Map, September 2024
Appendix B Groundwater Data Tables 1 & 2
Appendix C Chain of Custody and Laboratory Data Sheets
September 2024 Groundwater Monitoring Report
Former Blanding Chevron | Blanding, Utah
October 31, 2024 | Terracon Project No. AL067004
Facilities | Environmental | Geotechnical | Materials 1
1.0 Introduction
1.1 Site Description
The former Blanding Chevron facility is located at 200 North Highway 191, Blanding,Utah.
The site is assigned Facility ID 5000247, Release Site GFB by the Utah Division of
Environmental Response and Remediation (DERR).
Exhibit 1 (Appendix A) presents a topographical map of the area.Exhibit 2 (Appendix A)is a
site diagram depicting monitoring well locations.Exhibits 3 and 4 (Appendix A) depict
groundwater elevation contours in the shallow and deep aquifers, respectively, based on
depth-to-groundwater measurements that were collected on September 23 & 24, 2024.
1.2 Project Background
The September 2024 monitoring event was conducted to evaluate the current state of
petroleum impacts to groundwater at the site. In particular, evaluation of petroleum
constituent concentrations remaining in the monitoring wells and assessment of light non-
aqueous phase liquid (LNAPL) remaining in some of the wells. These current evaluation and
assessment activities are predicated on several previous monitoring events and two dual-
phase (liquid and vapor) extraction events conducted at the site in January 2008 and
August 2008. During the extraction events, Durham Geo SoakEase product-selective
absorbent socks and stainless steel canisters were also installed at monitoring wells MW-3,
MW-5, and MW-6. Monitoring well MW-6 was damaged during subsequent site construction
and is no longer in service. Groundwater monitoring was recommended on an 18-month
schedule to observe LNAPL and the dissolved-phase contamination in the groundwater over
time.
In general, petroleum hydrocarbon concentrations have been relatively high, particularly
near the former underground storage tank (UST) basin Exhibit 2 (Appendix A). Measurable
LNAPL has been persistent in the deep monitoring wells MW-3, MW-5, and MW-7 since the
September 2016 monitoring event as documented during the September 2016, May 2018,
October 2019, and September 2024 monitoring events. LNAPL was observed in the shallow
monitoring well MW-3B in the October 2019 and September 2024 groundwater monitoring
events. LNAPL was also observed for the first time in the deep monitoring well MW-8 in the
September 2024 event, with a measured thickness of approximately 1.65 feet. Although no
LNAPL was present in shallow monitoring well MW-4B, dissolved petroleum constituents
concentrations remain elevated.
September 2024 Groundwater Monitoring Report
Former Blanding Chevron | Blanding, Utah
October 31, 2024 | Terracon Project No. AL067004
Facilities | Environmental | Geotechnical | Materials 2
1.3 Scope of Work
The objective of Work Assignment GFB-36-TER was to measure depth to groundwater and
product thickness (where present) in all currently existing groundwater monitoring wells
(shallow wells MW-3B, MW-4B, and MW-8B, and deep wells MW-3, MW-4, MW-5, MW-7,
MW-8, and MW-10) using a product-water interface probe. The work plan for this
monitoring event also identified potential sampling of shallow monitoring wells MW-3B, MW-
4B, and MW-8B, and deep monitoring wells MW-3, MW-4, MW-5, MW-7, MW-8 and MW-10.
However, MW-3, MW-3B, MW-5, MW 7, and MW-8 contained LNAPL and were not sampled.
Collection of a sample from the Blanding City public access well from the publicly accessed
spigot was also conducted for use as a baseline reading (field blank) as per previous events.
As part of this work plan, petroleum-absorbent socks present in monitoring wells MW-3,
MW-3B, MW-5, and MW-7 were changed out for new socks, and one was added to MW-8.
The remainder of this report documents the results of this groundwater monitoring event
completed pursuant the work plan to begin the quarterly monitoring period at the site (i.e.,
approximately September 2024, December 2024, March 2025, and June 2025)
1.4 Standard of Care
Terracon’s services were performed in a manner consistent with generally accepted
practices of the profession undertaken in similar studies in the same geographical area
during the same time period. Please note that Terracon does not warrant the work of
laboratories, regulatory agencies or other third parties supplying information used in the
preparation of the report. These services were performed in accordance with the scope of
work agreed with you, our client, as reflected in our proposal, and were not restricted by
ASTM E1903-19.
1.5 Additional Scope Limitations
Findings, conclusions, and recommendations resulting from these services are based upon
information derived from the on-site activities and other services performed under this
scope of work. Such information is subject to change over time. Certain indicators of the
presence of hazardous substances, petroleum products, or other constituents may have
been latent, inaccessible, unobservable, non-detectable, or not present during these
services, and we cannot represent that the site contains no hazardous substances, toxic
materials, petroleum products, or other latent conditions beyond those identified during this
investigation. Subsurface conditions may vary from those encountered at specific borings or
wells or during other surveys, tests, assessments, investigations, or exploratory services;
the data, interpretations, findings, and our recommendations are based solely upon data
obtained at the time and within the scope of these services.
September 2024 Groundwater Monitoring Report
Former Blanding Chevron | Blanding, Utah
October 31, 2024 | Terracon Project No. AL067004
Facilities | Environmental | Geotechnical | Materials 3
1.6 Reliance
This report has been prepared for the exclusive use and reliance of the Utah Department of
Environmental Quality (UDEQ). Use or reliance by any other party is prohibited without the
written authorization of the UDEQ and Terracon. Reliance on the report by the client and all
authorized parties will be subject to the terms, conditions, and limitations stated in the
proposal, report, and Terracon’s Terms and Conditions. The limitation of liability defined in
the Terms and Conditions is the aggregate limit of Terracon’s liability to the client and all
relying parties.
2.0 September 2024 Groundwater Sampling Event
On September 23 and 24, 2024 Terracon measured free product thickness, where present,
and depth to groundwater in the groundwater monitoring wells (shallow wells MW-3B, MW-
4B, and MW-8B, and deep wells MW-3, MW-4, MW-5, MW-7, MW-8, and MW-10), using a
decontaminated product-water interface probe. Groundwater gradients were calculated for
the shallow and deep aquifers. Where free product was measured, the groundwater
elevations were corrected using the following formula.
Corrected GW Elev. (ft/bgs) = Measured GW Elev. (ft/bgs) + (LNAPL Thickness ft x 0.73)
Where:
corrected GW Elev. is the corrected groundwater elevation taking LNAPL into
account in feet below the ground surface (bgs).
measured GW Elev. is the measured groundwater elevation in feet bgs.
LNAPL Thickness is the measured thickness of LNAPL in feet.
0.73 is the relative density of automobile gasoline LNAPL.
As LNAPL was observed in deep wells MW-3, MW-5, MW-7, and MW-8 and shallow well MW-
3B during the September 2024 monitoring event, groundwater samples were not collected
from these locations. Groundwater samples for MW-4B and MW-8B were collected on
September 23, 2024 and for MW-4, MW-10, and the Blanding City public access well (BMW)
on October 24, 2024.
Groundwater sampling was conducted by a Utah-certified UST Groundwater and Soil
Sampler (John R. Murphy; GS 1947), with oversight from Utah-certified UST Consultants
(Amy Austin; CC0238 and Craig Eaton; CC0167).
Prior to sampling, three casing volumes were purged from the selected monitoring wells
using a disposable bailer. Following the removal of three casing volumes at each of the
wells, a disposable bailer was again used to collect the groundwater sample. The total
volume of water purged from each of the monitoring wells sampled was approximately 5
September 2024 Groundwater Monitoring Report
Former Blanding Chevron | Blanding, Utah
October 31, 2024 | Terracon Project No. AL067004
Facilities | Environmental | Geotechnical | Materials 4
gallons from MW-4, 29 gallons from MW-4B, 4 gallons from MW-8B, and 10 gallons from
MW-10.
All purge water was surface applied near the well that generated the water and allowed to
evaporate or infiltrate into surface soils. Care was taken to not allow purge water to affect
nearby receptors (storm water catch basins, other monitoring wells, utilities, etc.) or
residential property.
A sample was also collected from the nearby Blanding City public access well. Additionally, a
trip blank was also brought during this event and submitted for laboratory analyses.
3.0 Laboratory Analytical Methods
Groundwater samples were collected and placed in laboratory-prepared containers, labeled,
and placed on ice in a cooler and transported to Chemtech-Ford Laboratories, a Utah-
certified analytical laboratory located in Salt Lake City, Utah.
The four groundwater samples and field blank sample (Blanding City Well) were submitted
for analyses of methyl tertiary-butyl ether, benzene, toluene, ethylbenzene, total xylenes,
and naphthalene (MBTEXN), gasoline-range total petroleum hydrocarbons (TPH-GRO), and
diesel-range total petroleum hydrocarbons (TPH-DRO) with silica gel treatment (SGT). The
trip blank was analyzed for MBTEXN.
The samples were analyzed using the following methods:
Analysis Sample Type No. of
Samples Laboratory Method
MBTEXN
Groundwater,
Trip Blank, and
Field Blank
6 EPA Method 8260D
TPH-GRO Groundwater and
Field Blank 5 EPA Method 8260B/C
TPH-DRO (SGT)Groundwater and
Field Blank 5 EPA Method 8015C
w/SGT
The executed chain-of-custody form and laboratory data sheets are provided in Appendix C.
September 2024 Groundwater Monitoring Report
Former Blanding Chevron | Blanding, Utah
October 31, 2024 | Terracon Project No. AL067004
Facilities | Environmental | Geotechnical | Materials 5
4.0 Data Evaluation
Please refer to Table 1 (Appendix B) for a summary of well construction as well as current
and historical groundwater elevation data. Refer to Table 2 (Appendix B) for the current and
historical groundwater sample results, which also includes the Initial Screening Levels (ISLs)
and the Tier 1 screening criteria established by the DERR for comparison.
4.1 Observations
Depth-to-water measurements and groundwater elevations are presented in Table 1
(Appendix B). Depth-to-water in the shallow aquifer at the site was measured to range
between 5.25 to 7.63 feet below ground surface (bgs). Depth to water in the deeper aquifer
was measured to range between 72.31 to 81.49 feet bgs. LNAPL was observed in deep wells
MW-3 (2.41 feet thick), MW-5 (0.11 feet thick), MW-7 (3.57 feet thick), and MW-8 (1.65
feet thick). LNAPL was observed in shallow well MW-3B (0.88 feet thick). Groundwater
gradients in the shallow and deep aquifers are displayed on Exhibits 3 and 4 (Appendix A),
respectively. Where free product was measured, the groundwater gradients were calculated
using the corrected groundwater elevations, as discussed in Section 2.0. The general
groundwater flow direction is towards the south-southeast in the shallow aquifer and
generally to the south in the deep aquifer, which is in general agreement with previous
monitoring events.
4.2 Groundwater Sample Results
The analytical results are tabulated in Table 2 (Appendix B). Analytical results of the
monitoring well samples indicate that no petroleum constituent concentrations were present
above laboratory reporting limits in monitoring wells MW-8B or MW-10. TPH-GRO was
reported in deep well MW-4 at 1,470 µg/L which exceeded the ISL but was below Tier 1
screening criteria. Shallow monitoring well MW-4B results show several constituents present
above reporting limits with exceedances of both ISLs and Tier 1 screening criteria. These
include TPH-DRO (6,800 µg/L) and ethylbenzene (792 µg/L) exceeding ISLs, while TPH-GRO
(12,100 µg/L) and benzene (1,780 µg/L) exceed Tier 1 screening criteria. No samples were
collected from monitoring wells MW-3, MW-3B, MW-5, MW-7 or MW-8 due to the presence
of LNAPL.
4.3 Quality Control
Quality control for the sampling program was provided by sampling being conducted by a
Utah-certified UST Groundwater and Soil Sampler, using standardized sample collection and
handling methods, collecting and analyzing a trip blank and field blank (Blanding City Well),
documenting pertinent field information, and keeping chain-of-custody records, as well as
using a Utah-certified laboratory. All sampling procedures followed Terracon’s SOPs.
September 2024 Groundwater Monitoring Report
Former Blanding Chevron | Blanding, Utah
October 31, 2024 | Terracon Project No. AL067004
Facilities | Environmental | Geotechnical | Materials 6
The analytical laboratory report indicated that samples were extracted and analyzed within
appropriate sample holding times. Internal laboratory QA/QC procedures and results are
presented in the laboratory report, and these results were within acceptable limits set by
the laboratory.
None of the compounds analyzed were reported above their respective laboratory reporting
limits in either the trip blank or the field blank.
5.0 Findings and Conclusions
LNAPL was observed in the deep and shallow aquifers, in deep wells MW-3, MW-5, MW-7,
and MW-8 and shallow well MW-3B. LNAPL thicknesses in MW-3B (approximately 0.88 feet
thick) and MW-5 (0.11 feet thick) were less than the previous measurements from the
October 2019 event. However, LNAPL thicknesses in wells MW-3 (2.41 feet thick) and MW-7
(3.57 feet thick) were significantly greater than the previous sampling event. This is the first
event that LNAPL has been observed in monitoring well MW-8 (1.65 feet thick). All LNAPL
thickness measurements are included in Table 1 (Appendix B).
The depth-to-groundwater in the deeper aquifer has increased, as evidenced by a decrease
in groundwater elevations since the last monitoring event in 2019 (4.01 feet deeper in MW-
3, 3.38 feet deeper in MW-5, 4.15 feet deeper in MW-7, 5.14 deeper in MW-8 and 3.99 feet
deeper in MW-10). Historically, groundwater elevations in deep monitoring wells (MWs-3, 4,
5, 7, and 8) have dropped between 17 to 18 feet since 1998. It is possible that the increase
in depth-to-groundwater is affecting the amount and distribution of LNAPL that is present in
these deep aquifer wells. The depth-to-water in the shallow aquifer has remained fairly
consistent since 1999 with fluctuations over the years. The groundwater elevation raised
significantly since 2019 as evidenced by an increase in groundwater elevations at MWs-3B
(0.39 feet higher), 4B (3.04 feet higher), and 8B (1.06 feet higher).
Petroleum hydrocarbon impacts to the shallow aquifer appear to be relatively stable over
time. Historically MW-3B has had an inconsistent layer of LNAPL since 1999. However, even
when LNAPL has not been present, concentrations of TPH-GRO, TPH-DRO, benzene, toluene,
and ethylbenzene have exceeded ISLs and Tier 1 screening criteria. Analytical results from
monitoring well MW-4B indicate groundwater also exhibited historically similar petroleum
constituent concentrations, with benzene (1,780 µg/L) exceeding Tier 1 screening criteria,
and TPH-DRO (6,800 µg/L) and ethylbenzene (1,050 µg/L) exceeding ISLs. While TPH-GRO
(12,100 µg/L) did exceed Tier 1 screening criteria, concentrations have generally trended
downward since 1999. Analysis of groundwater from shallow monitoring well MW-8B shows
that none of the petroleum constituents were detected above their analytical method
reporting limits. Please see historical analytical data provided in Table 2 (Appendix B).
Deep aquifer samples were collected from deep monitoring wells MW-4 and MW-10. Only
TPH-GRO (1,750 µg/L) was identified in monitoring well MW-4, which exceeds the ISL. All
September 2024 Groundwater Monitoring Report
Former Blanding Chevron | Blanding, Utah
October 31, 2024 | Terracon Project No. AL067004
Facilities | Environmental | Geotechnical | Materials 7
other petroleum constituent concentrations were below laboratory reporting limits in MW-4.
Historically, MW-4 had benzene concentrations above Tier 1 screening criteria and toluene
concentrations above ISLs. Based on these results, it appears that contaminants are either
naturally attenuating or migrating/diluting with the groundwater flow to the southeast.
Analytical results from Monitoring Well MW-10 show that none of the constituents analyzed
were detected above their analytical method reporting limits during this event. Historically,
benzene has been reported in MW-10 at concentrations ranging from non-detect to 743
µg/L and was most recently detected at 100 µg/L in September 2016.
The scope of work also included collecting a groundwater sample from deep aquifer
Monitoring Well, MW-7. However, approximately 2.84 feet of LNAPL was measured during
this sampling event. Free product (LNAPL) was first identified in this well in September 2016
(0.50 feet). The progressive increase in LNAPL thickness in MW-7 may indicate that the
LNAPL plume may be moving down-gradient from the tank basin area, or the drop in
groundwater elevation is affecting the amount and distribution of LNAPL present in the deep
aquifer.
Terracon appreciates being of service to you on this project. If you have any questions,
require additional information, or need additional assistance, please contact us.
Appendix A
Exhibits
(Exhibits 1 through 4)
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terracon.com
Reviewed By:
Drawn By:
Oct 2024
Date:
AL067004
Project No.:
FORMER BLANDING CHEVRON
200 North Highway 191
Blanding, Utah
Topographic Map
1
PH. [phone]
Midvale, Utah 840476949 High Tech Drive
ABA
AST
DATA SOURCES:
ESRI WMS - World Aerial Imagery, OpenStreetMap
0 1 20.5
Miles
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Site
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Reviewed By:
Drawn By:
Oct 2024
Date:
AL067004
Project No.:
FORMER BLANDING CHEVRON
200 North Highway 191
Blanding, Utah
Site Map
2
PH. [phone]
Midvale, Utah 840476949 High Tech Drive
ABA
AST
DATA SOURCES:
ESRI WMS - World Aerial Imagery, OpenStreetMap
@A
@A
@A
@A
@A
@A
@A
@A
@AMW-4
MW-5
MW-3
MW-7
MW-8
MW-10
MW-3B
MW-8B
MW-4B
0 150 30075
Feet
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@A Shallow Monitoring Well
@A Deep Monitoring Well
Blanding City Well
Former UST Area
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Exhibit
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Reviewed By:
Drawn By:
Oct 2024
Date:
AL067004
Project No.:
FORMER BLANDING CHEVRON
200 North Highway 191
Blanding, Utah
Shallow Aquifer Potentiometric Surface Map, September 2024
3
PH. [phone]
Midvale, Utah 840476949 High Tech Drive
ABA
AST
DATA SOURCES:
ESRI WMS - World Aerial Imagery, OpenStreetMap
&
@A
@A
@A
96
ft
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90 f
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MW-3B
91.43(0.88)
MW-8B
88.38
MW-4B
96.01
0 100 20050
Feet
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@A Shallow Monitoring Well with Relative Groundwater Elevation (ft) and LNAPL Thickness (ft)
Shallow Groundwater Elevation Isocontour (ft), September 2024
&Shallow Groundwater Flow Direction
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Exhibit
terracon.com
Reviewed By:
Drawn By:
Oct 2024
Date:
AL067004
Project No.:
FORMER BLANDING CHEVRON
200 North Highway 191
Blanding, Utah
Deep Aquifer Potentiometric Surface Map, September 2024
4
PH. [phone]
Midvale, Utah 840476949 High Tech Drive
ABA
AST
DATA SOURCES:
ESRI WMS - World Aerial Imagery, OpenStreetMap
&
@A
@A
@A
@A
@A
@A
14 ft
16 ft
20 ft
18 ft
22 ft
MW-4 23.8
MW-5
22.91(0.11)
MW-3
20.85(2.41)
MW-7
18.29(3.57)
MW-8
17.53(1.65)
MW-10 12.13
0 150 30075
Feet
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@A Deep Monitoring Well with Relative Groundwater Elevation (ft) and LNAPL Thickness (ft)
Deep Groundwater Elevation Isocontour (ft), September 2024
&Deep Groundwater Flow Direction
Blanding City Well
Appendix B
Groundwater Data Tables
(Tables 1 & 2)
TABLE 1
Former Blanding Chevron / Facility ID 5000247, Release Site GFB
Well Construction and Groundwater Elevation Data
Terracon Project No. AL067004
Well ID
Well
Diameter
(inches)
Total
Depth
(feet)
Screened
Interval
(feet)1
Relative Top
of Casing
Elevation
(feet)2
Date
Depth to
Water (feet
below top of
casing)
Relative
Ground Water
Elevation
(feet)2
Measured
Product
Thickness
(feet)
Corrected
Groundwater
Elevation
(feet)3
MW-2B 2 19.78 5-20 98.52 06/12/01 DRY NA NM NA
08/29/01 DRY NA NM NA
05/14/02 DRY NA NM NA
08/06/02 DRY NA NM NA
02/18/03 DRY NA NM NA
05/28/03 NM NM NM NA
11/05/03 19.21 79.31 ND 79.31
06/14/04 DRY NA NM NA
03/29/99 5.70 91.18 ND 91.18
04/13/99 5.36 91.52 ND 91.52
08/12/99 5.21 91.67 ND 91.67
06/12/01 5.34 91.54 ND 91.54
08/29/01 6.18 90.70 ND 90.70
05/14/02 7.33 89.55 ND 89.55
08/06/02 8.01 88.87 ND 88.87
11/11/02 8.66 88.22 ND 88.22
02/18/03 9.00 88.02 ND 88.02
05/28/03 7.49 89.42 ND 89.42
11/05/03 9.14 87.85 ND 87.85
06/14/04 7.81 89.09 ND 89.09
10/10/06 9.46 89.36 1.94 90.78
05/09/07 8.71 88.17 1.82 89.50
06/30/10 4.08 92.80 ND 92.80
02/14/13 6.47 90.41 ND 90.41
09/12/13 6.05 90.83 ND 90.83
07/22/14 7.23 89.65 ND 89.65
11/10/14 7.70 89.18 0.03 89.20
09/28/16 6.62 90.26 ND 90.26
05/08/18 8.95 87.93 ND 87.93
10/30/19 6.93 89.95 1.5 91.05
09/23/24 6.09 90.79 0.88 91.43
03/29/99 5.41 95.85 ND 95.85
04/13/99 5.10 96.16 ND 96.16
08/12/99 5.71 95.55 ND 95.55
06/12/01 5.59 95.67 ND 95.67
08/29/01 7.07 94.19 ND 94.19
05/14/02 7.04 94.22 ND 94.22
08/06/02 8.48 92.78 ND 92.78
11/11/02 8.92 92.35 ND 92.35
02/18/03 8.41 92.86 ND 92.86
05/28/03 7.27 93.99 ND 93.99
11/05/03 9.05 92.21 ND 92.21
06/14/04 8.04 93.22 ND 93.22
10/10/06 7.69 93.63 0.06 93.67
05/09/07 7.36 93.90 0.03 93.92
06/30/10 5.60 95.66 ND 95.66
02/13/13 7.82 93.44 ND 93.44
09/11/13 7.89 93.37 ND 93.37
07/23/14 8.33 92.93 ND 92.93
11/10/14 8.46 92.80 ND 92.80
09/28/16 7.98 93.28 ND 93.28
05/08/18 10.04 91.22 ND 91.22
10/30/19 8.29 92.97 ND 92.97
09/23/24 5.25 96.01 ND 96.01
20.44MW-4B
(shallow,
unconfined)
4
MW-3B
(shallow,
unconfined)
4 20.37 10-20 96.88
10-20 101.26
Page 1 of 6
TABLE 1
Former Blanding Chevron / Facility ID 5000247, Release Site GFB
Well Construction and Groundwater Elevation Data
Terracon Project No. AL067004
Well ID
Well
Diameter
(inches)
Total
Depth
(feet)
Screened
Interval
(feet)1
Relative Top
of Casing
Elevation
(feet)2
Date
Depth to
Water (feet
below top of
casing)
Relative
Ground Water
Elevation
(feet)2
Measured
Product
Thickness
(feet)
Corrected
Groundwater
Elevation
(feet)3
03/29/99 7.98 88.03 ND 88.03
04/13/99 7.61 88.40 ND 88.40
08/12/99 7.70 88.31 ND 88.31
06/12/01 7.63 88.38 ND 88.38
08/29/01 8.70 87.31 ND 87.31
05/14/02 9.10 86.91 ND 86.91
08/06/02 9.94 86.07 ND 86.07
11/11/02 10.74 85.28 ND 85.28
02/18/03 10.86 85.15 ND 85.15
05/28/03 9.56 86.45 ND 86.45
11/05/03 10.97 85.04 ND 85.04
06/14/04 10.00 86.01 ND 86.01
10/10/06 9.46 86.55 ND 86.55
05/09/07 9.27 86.74 ND 86.74
06/30/10 6.17 89.84 ND 89.84
02/13/13 8.82 87.19 ND 87.19
09/11/13 8.67 87.34 ND 87.34
07/21/14 9.03 86.98 ND 86.98
11/10/14 9.44 86.57 ND 86.57
09/28/16 8.39 87.62 ND 87.62
05/08/18 10.49 85.52 ND 85.52
10/30/19 8.69 87.32 ND 87.32
09/23/24 7.63 88.38 ND 88.38
03/29/99 5.50 90.50 ND 90.50
04/13/99 5.22 90.78 ND 90.78
08/12/99 5.21 90.79 ND 90.79
06/12/01 5.21 90.79 ND 90.79
08/29/01 5.86 90.14 ND 90.14
05/14/02 6.68 89.32 ND 89.32
08/06/02 8.04 87.96 ND 87.96
11/11/02 9.10 86.91 ND 86.91
02/18/03 9.27 86.73 ND 86.73
05/28/03 NM NM NM NM
11/05/03 9.22 86.78 ND 86.78
06/14/04 8.18 87.82 ND 87.82
03/24/98 60.09 44.61 ND 44.61
07/16/98 61.06 43.64 ND 43.64
11/18/98 60.56 44.14 ND 44.14
02/19/99 60.32 44.38 ND 44.38
03/29/99 60.84 43.86 ND 43.86
04/13/99 60.51 44.19 ND 44.19
08/12/99 61.41 43.29 ND 43.29
06/12/01 62.31 42.39 ND 42.39
08/29/01 62.74 41.96 ND 41.96
05/14/02 62.93 41.77 ND 41.77
08/06/02 63.42 41.28 ND 41.28
11/11/02 63.57 41.14 ND 41.14
02/18/03 63.52 41.18 ND 41.18
05/28/03 NM NM NM NM
11/05/03 64.80 39.90 ND 39.90
06/14/04 65.54 39.16 ND 39.16
2
MW-1
(deep,
confined)
MW-8B
(shallow,
unconfined)
2 16.92
2
20.29
90.19 104.7070-90
MW-9B
(shallow,
unconfined)
10-20 96.00
5-17 96.01
Page 2 of 6
TABLE 1
Former Blanding Chevron / Facility ID 5000247, Release Site GFB
Well Construction and Groundwater Elevation Data
Terracon Project No. AL067004
Well ID
Well
Diameter
(inches)
Total
Depth
(feet)
Screened
Interval
(feet)1
Relative Top
of Casing
Elevation
(feet)2
Date
Depth to
Water (feet
below top of
casing)
Relative
Ground Water
Elevation
(feet)2
Measured
Product
Thickness
(feet)
Corrected
Groundwater
Elevation
(feet)3
03/24/98 57.30 43.67 ND 43.67
07/16/98 57.78 43.19 ND 43.19
11/18/98 57.59 43.38 ND 43.38
02/19/99 57.49 43.48 ND 43.48
03/29/99 57.87 43.10 ND 43.10
04/13/99 57.65 43.32 ND 43.32
08/12/99 58.21 42.76 ND 42.76
06/12/01 58.98 41.99 ND 41.99
08/29/01 59.45 41.52 ND 41.52
05/14/02 60.00 40.97 ND 40.97
08/06/02 60.62 40.35 ND 40.35
11/11/02 61.00 39.98 ND 39.98
02/18/03 60.91 40.07 ND 40.07
05/28/03 NM NM NM NM
11/05/03 62.07 38.90 ND 38.90
06/14/04 62.59 38.38 ND 38.38
03/24/98 58.59 39.43 ND 39.43
07/16/98 59.26 38.76 ND 38.76
11/18/98 59.07 38.95 ND 38.95
02/19/99 58.85 39.17 ND 39.17
03/29/99 59.37 38.65 ND 38.65
04/13/99 59.00 39.02 ND 39.02
08/12/99 59.67 38.35 ND 38.35
06/12/01 60.53 37.49 ND 37.49
08/29/01 60.92 37.10 ND 37.10
05/14/02 61.37 36.65 ND 36.65
08/06/02 62.03 35.99 ND 35.99
11/11/02 62.31 35.71 ND 35.71
02/18/03 62.18 35.85 ND 35.85
05/28/03 63.01 35.01 ND 35.01
11/05/03 63.34 34.68 ND 34.68
06/14/04 64.06 33.96 ND 33.96
10/11/06 65.38 32.66 0.02 32.67
05/10/07 65.44 32.58 0.01 32.59
06/30/10 67.21 30.81 ND 30.81
02/14/13 68.01 30.01 ND 30.01
09/12/13 68.38 29.64 ND 29.64
07/22/14 68.98 29.04 ND 29.04
11/10/14 69.68 28.34 ND 28.34
09/28/16 70.45 27.57 0.04 27.60
05/08/18 71.87 26.15 0.09 26.22
10/30/19 73.22 24.80 0.08 24.86
09/23/24 78.93 19.09 2.41 20.85
70-90MW-2
(deep,
confined)
89.85MW-3
(deep,
confined)
2 100.9784.31
2 70-90 98.02
Page 3 of 6
TABLE 1
Former Blanding Chevron / Facility ID 5000247, Release Site GFB
Well Construction and Groundwater Elevation Data
Terracon Project No. AL067004
Well ID
Well
Diameter
(inches)
Total
Depth
(feet)
Screened
Interval
(feet)1
Relative Top
of Casing
Elevation
(feet)2
Date
Depth to
Water (feet
below top of
casing)
Relative
Ground Water
Elevation
(feet)2
Measured
Product
Thickness
(feet)
Corrected
Groundwater
Elevation
(feet)3
03/24/98 60.15 42.51 ND 42.51
07/16/98 60.88 41.78 ND 41.78
11/18/98 60.62 42.04 ND 42.04
02/19/99 60.37 42.29 ND 42.29
03/29/99 60.96 41.70 ND 41.70
04/13/99 60.57 42.09 ND 42.09
08/12/99 62.38 40.28 ND 40.28
06/12/01 62.08 40.58 ND 40.58
08/29/01 62.61 40.05 ND 40.05
05/14/02 62.98 39.68 ND 39.68
08/06/02 63.54 39.12 ND 39.12
11/11/02 63.81 38.86 ND 38.86
02/18/03 63.69 38.98 ND 38.98
05/28/03 64.65 38.01 ND 38.01
11/05/03 64.89 37.77 ND 37.77
06/14/04 65.55 37.11 ND 37.11
10/11/06 66.67 35.99 ND 35.99
05/09/07 66.86 35.80 ND 35.80
06/29/10 68.65 34.01 ND 34.01
02/13/13 69.43 33.23 ND 33.23
09/11/13 69.78 32.88 ND 32.88
07/23/14 70.30 32.36 ND 32.36
11/10/14 70.13 32.53 ND 32.53
09/28/16 72.04 30.62 ND 30.62
05/08/18 73.45 29.21 ND 29.21
10/30/19 75.39 27.27 ND 27.27
09/24/24 78.86 23.80 ND 23.80
03/24/98 59.13 41.33 ND 41.33
07/16/98 59.72 40.74 ND 40.74
11/18/98 59.60 40.86 ND 40.86
02/19/99 59.40 41.06 ND 41.06
03/29/99 60.41 40.05 ND 40.05
04/13/99 59.62 40.84 ND 40.84
08/12/99 61.99 38.47 ND 38.47
06/12/01 61.02 39.44 ND 39.44
08/29/01 61.51 38.95 ND 38.95
05/14/02 62.03 38.43 ND 38.43
08/06/02 62.59 37.87 ND 37.87
11/11/02 62.99 37.47 ND 37.47
02/18/03 62.82 37.64 ND 37.64
05/28/03 NM NM NM NM
11/05/03 63.98 36.48 ND 36.48
06/14/04 64.55 35.91 ND 35.91
10/11/06 65.77 34.72 0.03 34.74
05/09/07 66.01 34.45 ND 34.45
06/30/10 67.89 32.57 ND 32.57
02/13/13 68.71 31.75 ND 31.75
09/12/13 69.11 31.35 ND 31.35
07/21/14 69.65 30.81 ND 30.81
11/10/14 69.42 31.04 ND 31.04
09/28/16 71.34 29.12 ND 29.12
05/08/18 73.3 27.16 1.00 27.89
10/30/19 75.66 24.80 2.04 26.29
09/23/24 77.63 22.83 0.11 22.91
MW-4
(deep,
confined)
2 89.95
70-90 100.4689.94
102.6670-90
MW-5
(deep,
confined)
2
Page 4 of 6
TABLE 1
Former Blanding Chevron / Facility ID 5000247, Release Site GFB
Well Construction and Groundwater Elevation Data
Terracon Project No. AL067004
Well ID
Well
Diameter
(inches)
Total
Depth
(feet)
Screened
Interval
(feet)1
Relative Top
of Casing
Elevation
(feet)2
Date
Depth to
Water (feet
below top of
casing)
Relative
Ground Water
Elevation
(feet)2
Measured
Product
Thickness
(feet)
Corrected
Groundwater
Elevation
(feet)3
03/29/99 61.68 38.24 ND 38.24
04/14/99 61.32 38.60 ND 38.60
08/12/99 62.09 37.83 ND 37.83
06/12/01 62.99 36.93 ND 36.93
08/29/01 63.33 36.59 ND 36.59
05/14/02 63.76 36.16 ND 36.16
08/06/02 64.46 35.46 ND 35.46
11/11/02 64.60 35.33 ND 35.33
02/18/03 64.55 35.37 ND 35.37
05/28/03 NM NM NM NM
11/05/03 65.65 34.27 ND 34.27
06/14/04 66.38 33.54 ND 33.54
10/11/06 65.37 34.57 0.02 34.58
05/10/07 67.84 32.08 ND 32.08
03/29/99 60.88 36.29 ND 36.29
04/14/99 60.61 36.56 ND 36.56
08/12/99 61.17 36.00 ND 36.00
06/12/01 62.14 35.03 ND 35.03
08/29/01 62.55 34.62 ND 34.62
05/14/02 63.06 34.11 ND 34.11
08/06/02 63.70 33.47 ND 33.47
11/11/02 63.99 33.18 ND 33.18
02/18/03 63.86 33.31 ND 33.31
05/28/03 NM NM NM NM
11/05/03 64.99 32.18 ND 32.18
06/14/04 65.55 31.62 ND 31.62
10/11/06 66.81 30.36 ND 30.36
05/10/07 67.14 30.03 ND 30.03
06/30/10 68.78 28.39 ND 28.39
02/13/13 69.62 27.55 ND 27.55
09/11/13 69.93 27.24 ND 27.24
07/21/14 70.46 26.71 ND 26.71
11/10/14 70.28 26.89 ND 26.89
09/28/16 72.00 25.17 0.5 25.54
05/08/18 73.10 24.07 0.62 24.52
10/30/19 76.80 20.37 2.84 22.44
09/23/24 81.49 15.68 3.57 18.29
03/29/99 62.02 34.56 ND 34.56
04/14/99 61.81 34.77 ND 34.77
08/12/99 62.22 34.36 ND 34.36
06/12/01 63.17 33.41 ND 33.41
08/29/01 63.66 32.92 ND 32.92
05/14/02 64.11 32.47 ND 32.47
08/06/02 64.72 31.86 ND 31.86
11/11/02 64.99 31.60 ND 31.60
02/18/03 64.85 31.73 ND 31.73
05/28/03 65.52 31.07 ND 31.07
11/05/03 65.94 30.64 ND 30.64
06/14/04 66.58 30.00 ND 30.00
10/12/06 67.72 28.86 ND 28.86
05/10/07 68.04 28.54 ND 28.54
06/30/10 69.55 27.03 ND 27.03
02/13/13 70.35 26.23 ND 26.23
09/11/13 70.70 25.88 ND 25.88
07/21/14 71.22 25.36 ND 25.36
11/10/14 70.98 25.60 ND 25.60
09/28/16 72.50 24.08 ND 24.08
05/08/18 73.80 22.78 ND 22.78
10/30/19 75.11 21.47 ND 21.47
09/24/24 80.25 16.33 1.65 17.53
90.14
90.09 70-90MW-8
(deep,
confined)
2
90.15 70-90 97.17
96.58
MW-7
(deep,
confined)
2
2MW-6
(deep,
confined)
99.9270-90
Page 5 of 6
TABLE 1
Former Blanding Chevron / Facility ID 5000247, Release Site GFB
Well Construction and Groundwater Elevation Data
Terracon Project No. AL067004
Well ID
Well
Diameter
(inches)
Total
Depth
(feet)
Screened
Interval
(feet)1
Relative Top
of Casing
Elevation
(feet)2
Date
Depth to
Water (feet
below top of
casing)
Relative
Ground Water
Elevation
(feet)2
Measured
Product
Thickness
(feet)
Corrected
Groundwater
Elevation
(feet)3
06/12/01 65.20 28.60 ND 28.60
08/29/01 65.55 28.25 ND 28.25
05/14/02 66.06 27.74 ND 27.74
08/06/02 66.71 27.09 ND 27.09
11/11/02 67.03 26.77 ND 26.77
02/18/03 66.85 26.96 ND 26.96
05/28/03 67.39 26.42 ND 26.42
11/05/03 67.93 25.87 ND 25.87
06/14/04 68.46 25.34 ND 25.34
06/12/01 56.98 27.46 ND 27.46
08/29/01 57.38 27.06 ND 27.06
05/14/02 57.91 26.53 ND 26.53
08/06/02 58.58 25.86 ND 25.86
11/11/02 58.92 25.52 ND 25.52
02/18/03 58.75 25.69 ND 25.69
05/28/03 59.26 25.18 ND 25.18
11/05/03 59.81 24.63 ND 24.63
06/14/04 60.32 24.12 ND 24.12
10/12/06 61.63 22.81 ND 22.81
05/10/07 61.85 22.59 ND 22.59
06/30/10 63.37 21.07 ND 21.07
02/12/13 64.06 20.38 ND 20.38
09/11/13 65.61 18.83 ND 18.83
07/21/14 64.99 19.45 ND 19.45
11/10/14 64.64 19.80 ND 19.80
09/28/16 66.00 18.44 ND 18.44
05/08/18 67.12 17.32 ND 17.32
10/30/19 68.32 16.12 ND 16.12
09/24/24 72.31 12.13 ND 12.13
1 = Screened intervals were taken from well logs
2 = Elevation, relative to an arbitrary datum of 100 feet
3 = Groundwater elevation corrected for the presence of free product using the following equation: hc = hm + (Ho)(ro/rw) where:
hm = Uncorrected groundwater elevation (ft)
Ho = Thickness of free product in well (ft)
ro = Density of product =0.73 g/mL (typical range for gasoline is from 0.71 - 0.77 g/mL)
rw = Density of water =1g/mL
NM = Not Measured
ND = Not Detected
93.80
MW-10
(deep,
confined)
2 93.25 60-90
MW-9
(deep,
confined)
2 92.01 60-90
84.44
Page 6 of 6
TABLE 2
Former Blanding Chevron / Facility ID 5000247, Release Site GFB
Groundwater Analytical Results (g/L)
Terracon Project No. AL067004
Sample
Identification
Sample
Date
Depth to
Water (ft-
btoc)
Relative
Ground
Water
Elevation
(feet)1
TPH-GRO TPH-DRO MTBE Benzene Toluene Ethyl-
benzene
Total
Xylenes
Naph-
thalene
1,000 1,000 200 5 1,000 700 10,000 700
10,000 10,000 200 300 3,000 4,000 10,000 700
MW-2B
(shallow,
06/12/01 DRY NA NS NS NS NS NS NS NS NS
08/29/01 DRY NA NS NS NS NS NS NS NS NS
05/14/02 DRY NA NS NS NS NS NS NS NS NS
08/06/02 DRY NA NS NS NS NS NS NS NS NS
11/12/02 NM NM NS NS NS NS NS NS NS NS
02/18/03 DRY NA NS NS NS NS NS NS NS NS
05/29/03 NM NM NS NS NS NS NS NS NS NS
11/06/03 19.21 79.31 <500 <500 <2 <2 <2 <2 <6 <2
06/15/04 DRY NA NS NS NS NS NS NS NS NS
04/14/99 5.36 91.52 27,400 <500 62.3 1,990 2,130 223 1,870 223
08/13/99 5.21 91.67 12,200 <500 <100 1,150 1,780 729 3,130 414
06/12/01 5.34 91.54 46,800 6,700 <100 3,130 4,850 954 4,220 518
08/29/01 6.18 90.70 37,900 4,900 <102 3,580 5,770 1,060 4,520 427
05/15/02 7.33 89.55 36,200 3,400 <200 3,970 5,470 989 4,260 358
08/07/02 8.01 88.87 34,000 3,400 <20 2,250 3,110 656 2,870 422
11/12/02 8.66 88.22 40,100 4,700 <50 3,830 E 5,310 E 1,110 4850 E 497
02/18/03 8.86 88.02
05/29/03 7.46 89.42
11/06/03 9.03 87.85
06/15/04 7.79 89.09
10/10/06 9.46 89.36 (1.94')
05/09/07 8.71 88.17 (1.82')
06/30/10 4.08 92.80 20,000 <1,000 <20 2,760 3,390 942 3,470 593
02/14/13 6.47 90.41 19,900 2,300 <20 1,620 2,260 951 3,430 312
09/11/13 6.05 90.83 19,700 2,700 <20 1,830 2,650 925 3,400 423
07/22/14 7.23 89.65 26,800 3,700 <10 2,330 3,240 1,470 5,580 1,110
11/10/14 7.70 89.18 (0.03')
09/28/16 6.62 90.26 24,300 4,500 <50 2430 3710 1030 3,890 418
05/08/18 8.95 87.93 25,400 7,000 <5 1960 2640 1330 5,560 532
10/30/19 6.93 89.95 (1.5')
09/23/24 6.09 90.79 (0.88')
04/14/99 5.10 96.16 43,700 <500 48.3 3,760 2,010 894 5,530 383
08/13/99 5.71 95.55 29,600 <500 <200 5,290 1,700 1,740 10,300 656
06/12/01 5.59 95.67 55,600 6,200 <100 4,760 1,140 1,570 9,030 516
08/29/01 7.07 94.19 53,900 6,800 <102 5,180 1,450 2,020 11,600 599
05/14/02 7.04 94.22 58,400 4,100 <200 7,120 5,950 1,510 8,530 436
08/07/02 8.48 92.78 63,100 4,100 <500 6,930 7,000 1,370 7,890 <500
11/12/02 8.92 92.35 56,100 4,900 <100 6,890 E 7,624 E 1,311 7,050 399
02/18/03 8.41 92.86 55,700 5,700 <100 4,310 4,760 903 5,330 366
05/29/03 7.27 93.99 36,000 E 5,900 <34 4,700 E 4,200 E 380 4,500 180
11/06/03 9.05 92.21 50,900 6,880 <100 6,220 E 7,690 E 1,180 5,900 362
06/15/04 8.04 93.22 54,170 5,280 <100 6,994 7,937 809 5,990 <100
10/10/06 7.69 93.63 (0.06')
05/09/07 7.36 93.90 (0.03')
06/30/10 5.60 95.66 28,300 2,900 <20 2,490 2,500 1,570 6,440 686
02/13/13 7.82 93.44 21,700 1,400 <5 3,030 3,420 954 4,220 268
09/11/13 7.89 93.37 23,800 2,700 <25 3,600 4,100 1,190 5,220 446
07/23/14 8.33 92.93 20,100 1,700 <10 4,000 4,230 898 4,350 476
11/10/14 8.46 92.80 28,800 2,400 <20 4,260 4,160 921 5,490 549
09/28/16 7.98 93.28 NS NS NS NS NS NS NS NS
05/08/18 10.04 91.20 NS NS NS NS NS NS NS NS
10/30/19 8.29 92.97 21,200 5,700 <5 3,420 1,880 1,050 3,370 457
09/23/24 5.25 96.01 12,100 6,800 <8 1,780 621 792 1,700 692
Initial Screening Levels (µg/L)
Tier 1 Screening Criteria (µg/L)
MW-3B
(shallow,
unconfined)
MW-4B
(shallow,
unconfined)
LNAPL
LNAPL LNAPL
LNAPL
LNAPL LNAPL
LNAPL
LNAPL
LNAPL
LNAPL
LNAPL
LNAPL
LNAPL
LNAPL
LNAPL
LNAPL
LNAPL
LNAPL
LNAPL
LNAPL
LNAPL LNAPL
1 of 6
TABLE 2
Former Blanding Chevron / Facility ID 5000247, Release Site GFB
Groundwater Analytical Results (g/L)
Terracon Project No. AL067004
Sample
Identification
Sample
Date
Depth to
Water (ft-
btoc)
Relative
Ground
Water
Elevation
(feet)1
TPH-GRO TPH-DRO MTBE Benzene Toluene Ethyl-
benzene
Total
Xylenes
Naph-
thalene
1,000 1,000 200 5 1,000 700 10,000 700
10,000 10,000 200 300 3,000 4,000 10,000 700
Initial Screening Levels (µg/L)
Tier 1 Screening Criteria (µg/L)
04/14/99 7.61 88.40 <500 <500 <2 5.9 <2 <2 <6 <2
08/13/99 7.70 88.31 <500 <500 <2 9 4.6 <2 <6 21.8
06/12/01 7.63 88.38 1,500 980 <2 322 26.3 4.8 18.9 19.3
08/29/01 8.70 87.31 <500 1,100 <3.3 52.0 4.3 <3.3 <9.9 15.9
05/15/02 9.10 86.91 570 <500 <10 138 31.2 <10 <30 <10
08/06/02 9.94 86.07 500 640 <2 92.3 5.1 <2 <6 13.2
11/12/02 10.74 85.28 2,700 1,700 <5 960 122 93.6 298 89.7
02/18/03 10.86 85.15 15,900 4,100 <10 2,040 494 355 683 194
05/29/03 9.56 86.45 13,000 2,700 <20 2,500 E 1,100 E 330 1,000 230
11/06/03 10.97 85.04 10,400 4,380 <20 2,380 E 241 394 635 227
06/15/04 10.00 86.01 15,660 E 4,290 <10 2,542 E 1,046 E 378 1,420 253
10/10/06 9.46 86.55 61 <2,000 <1 12 <1 <1 12 5
05/09/07 9.27 86.74 123 <2,000 <1 11 <1 <1 <3 5
06/30/10 6.17 89.84 <50 <1,000 <1 4 <1 <1 4 <2
02/13/13 8.82 87.19 <50 <1,000 <1 <1 <1 <1 <3 <2
09/11/13 8.67 87.34 <50 <1,000 <1 <1 <1 <1 <3 <2
07/21/14 9.03 86.98 272 <1,000 <1 91 13 30 19 7
11/10/14 9.44 86.57 124 <1,000 <1 6 2 4 <3 <2
09/28/16 8.39 87.62 <222 <200 <5 <2 <5 <5 <5 <5
05/08/18 10.49 85.52 <125 <1,000 <5 <5 <12 <12 <12 <12
10/30/19 8.69 87.32 <125 <1,000 <5 <5 <12 <12 <12 <12
09/23/24 7.63 88.38 <125 <1,000 <8 <5 <12 <12 <38 <12
04/14/99 5.22 90.78 <500 <500 <2 <2 <2 <2 <6 <2
08/13/99 5.21 90.79 <500 <500 <2 3 2.5 <2 <6 2.2
06/12/01 5.21 90.79 <500 <500 <2 <2 <2 <2 <6 <2
08/29/01 5.86 90.14 <500 <500 <2 <2 <2 <2 <6 <2
05/15/02 6.68 89.32 <500 <500 <2 <2 <2 <2 <6 <2
08/06/02 8.04 87.96 <500 <500 <2 <2 <2 <2 <6 <2
11/12/02 9.10 86.91 <500 <500 <2 <2 <2 <2 <6 <2
02/18/03 9.27 86.73 <500 <500 <2 <2 <2 <2 <6 <2
05/29/03 NM NM NS NS NS NS NS NS NS NS
11/06/03 9.22 86.78 NS NS NS NS NS NS NS NS
06/15/04 8.18 87.82 NS NS NS NS NS NS NS NS
03/24/98 60.09 44.61 <500 <500 <2 <2 <2 <2 <6 <2
07/16/98 61.06 43.64 <500 <500 <2 <2 <2 <2 <6 <2
11/18/98 60.56 44.14 <500 <500 <2 <2 <2 <2 <6 <2
02/19/99 60.32 44.38 <500 <500 <2 <2 <2 <2 <6 <2
04/14/99 60.51 44.19 <500 4,500 <2 <2 <2 <2 <6 <2
08/13/99 61.41 43.29 <500 <500 <2 <2 <2 <2 <6 <2
06/12/01 62.31 42.39 <500 <500 <2 <2 <2 <2 <6 <2
08/29/01 62.74 41.96 NS NS NS NS NS NS NS NS
05/14/02 62.93 41.77 <500 <500 <2 <2 <2 <2 <6 <2
08/06/02 63.42 41.28 NS NS NS NS NS NS NS NS
11/12/02 63.57 41.14 NS NS NS NS NS NS NS NS
02/18/03 63.52 41.18 NS NS NS NS NS NS NS NS
05/29/03 NM NM NS NS NS NS NS NS NS NS
11/06/03 64.80 39.90 NS NS NS NS NS NS NS NS
06/15/04 65.54 39.16 NS NS NS NS NS NS NS NS
MW-9B
(shallow,
unconfined)
MW-1
(deep, confined)
MW-8B
(shallow,
unconfined)
2 of 6
TABLE 2
Former Blanding Chevron / Facility ID 5000247, Release Site GFB
Groundwater Analytical Results (g/L)
Terracon Project No. AL067004
Sample
Identification
Sample
Date
Depth to
Water (ft-
btoc)
Relative
Ground
Water
Elevation
(feet)1
TPH-GRO TPH-DRO MTBE Benzene Toluene Ethyl-
benzene
Total
Xylenes
Naph-
thalene
1,000 1,000 200 5 1,000 700 10,000 700
10,000 10,000 200 300 3,000 4,000 10,000 700
Initial Screening Levels (µg/L)
Tier 1 Screening Criteria (µg/L)
03/24/98 57.30 43.67 <500 <500 <2 <2 <2 <2 <6 <2
07/16/98 57.78 43.19 <500 <500 <2 3.2 <2 <2 <6 <2
11/18/98 57.59 43.38 <500 <500 <2 2.9 <2 <2 <6 <2
02/19/99 57.49 43.48 <500 <500 <2 3.3 <2 <2 <6 <2
04/14/99 57.65 43.32 <500 <500 <2 <2 <2 <2 <6 <2
08/13/99 58.21 42.76 <500 <500 <2 <2 <2 <2 <6 <2
06/12/01 58.98 41.99 <500 <500 <2 <2 <2 <2 <6 <2
08/29/01 59.45 41.52 NS NS NS NS NS NS NS NS
05/14/02 60.00 40.97 <500 <500 <2 <2 <2 <2 <6 <2
08/06/02 60.62 40.35 NS NS NS NS NS NS NS NS
11/12/02 61.00 39.98 NS NS NS NS NS NS NS NS
02/18/03 60.91 40.07 NS NS NS NS NS NS NS NS
05/29/03 NM NM NS NS NS NS NS NS NS NS
11/06/03 62.07 38.90 NS NS NS NS NS NS NS NS
06/15/04 62.59 38.38 NS NS NS NS NS NS NS NS
03/24/98 58.59 39.43 4,500 <500 <5 488 611 67.1 449 41.4
07/16/98 59.26 38.76 10,300 <500 <50 1,700 2,250 185 1,480 80.6
11/19/98 59.07 38.95 5,000 <500 <2 717 754 69.9 512 40.3
02/19/99 58.85 39.17 5,900 <500 <10 864 923 53.4 497 22.9
04/14/99 59.00 39.02 84,000 <500 <100 4,920 6,250 360 3,470 141
08/13/99 59.67 38.35 12,900 <500 <100 2,310 2,930 238 2,030 79.9
06/12/01 60.53 37.49 45,600 7,800 <200 4,260 6,130 522 3,630 224
08/29/01 60.92 37.10 33,000 5,800 <102 3,570 5,740 521 3,900 198
05/15/02 61.37 36.65 51,500 6,100 <200 6,420 10,100 728 5,300 206
08/07/02 62.03 35.99 65,400 7,900 <500 6,990 11,300 881 6,020 <500
11/12/02 62.31 35.71 54,600 8,000 <65 6,160 E 10,200 E 964 6,230 E 360
02/18/03 62.18 35.85 75,600 8,100 <100 6,140 9,650 912 5,920 286
05/29/03 63.01 35.01 58,000 10,000 <100 5,800 E 9,000 E 650 5,800 310
11/06/03 63.34 34.68 47,400 8,050 <100 5,200 E 8,620 E 834 5,880 256
06/15/04 64.06 33.96 39,440 6,120 <100 4,494 5,795 <100 4,610 189
10/11/06 65.38 32.66 (0.02')
05/10/07 65.44 32.58 (0.01')
06/30/10 67.21 30.81 3,260 <1,000 <5 193 215 81 358 51
02/14/13 68.01 30.01 1,150 <1,000 <5 151 104 40 95 33
09/11/13 68.38 29.64 1,480 <1,000 1 52 66 21 131 31
07/22/14 68.98 29.04
11/10/14 69.68 28.34
09/28/16 70.45 27.60 (0.04')
05/08/18 71.87 26.22 (0.09')
10/30/19 73.22 24.80 (0.08')
09/23/24 78.93 19.09 (2.41')
MW-2
(deep, confined)
MW-3
(deep, confined)
LNAPL
LNAPL LNAPL
LNAPL
LNAPL LNAPL
LNAPL
LNAPL
LNAPL
LNAPL
LNAPL
LNAPLLNAPL
LNAPL LNAPL
LNAPL
3 of 6
TABLE 2
Former Blanding Chevron / Facility ID 5000247, Release Site GFB
Groundwater Analytical Results (g/L)
Terracon Project No. AL067004
Sample
Identification
Sample
Date
Depth to
Water (ft-
btoc)
Relative
Ground
Water
Elevation
(feet)1
TPH-GRO TPH-DRO MTBE Benzene Toluene Ethyl-
benzene
Total
Xylenes
Naph-
thalene
1,000 1,000 200 5 1,000 700 10,000 700
10,000 10,000 200 300 3,000 4,000 10,000 700
Initial Screening Levels (µg/L)
Tier 1 Screening Criteria (µg/L)
03/24/98 60.15 42.51 1,900 <500 <5 7.1 37 15.3 97.7 16.8
07/16/98 60.88 41.78 700 <500 <2 169 324 4.7 181 12.7
11/19/98 60.62 42.04 <500 <500 <2 2.1 <2 <2 <6 <2
02/19/99 60.37 42.29 <500 <500 <2 <2 <2 <2 <6 <2
04/14/99 60.57 42.09 <500 <500 <2 <2 <2 <2 <6 <2
08/13/99 62.38 40.28 <500 <500 <2 3.7 3 <2 <6 <2
06/12/01 62.08 40.58 <500 <500 <2 19.3 37.9 <2 20.8 <2
08/29/01 62.61 40.05 1,000 880 <3.3 208 116 <3.3 137 4.1
05/14/02 62.98 39.68 650 <500 <20 108 93.8 <20 75.9 <20
08/07/02 63.54 39.12 6,700 790 <100 612 1,390 <100 689 <100
11/12/02 63.81 38.86 22,800 3,000 <20 2,390 E 4,790 E 20.7 2,440 E 138
02/18/03 63.69 38.98 5,700 3,000 <20 683 586 <20 397 28.0
05/29/03 64.65 38.01 14,000 2,500 <20 1,600 E 3,500 E 21 1,600 79
11/06/03 64.89 37.77 9,920 3,350 <20 804 686 <20 1,010 78
06/15/04 65.55 37.11 10,430 3,850 <10 706 1,002 E <10 1,590 110
10/11/06 66.67 35.99 6,470 <2,000 <10 866 1,280 39 698 134
05/09/07 66.86 35.80 9,700 <2,000 <5 <5 <5 105 3,010 243
06/29/10 68.65 34.01 17,900 <1,000 <20 5,180 4,830 169 2,440 306
02/13/13 69.43 33.23 17,500 2,900 <5 4,100 3,050 89 901 150
09/11/13 69.78 32.88 5,000 <1,000 <10 1,430 958 44 376 91
07/23/14 70.30 32.36 2,530 <1,000 <10 978 340 17 474 81
11/10/14 70.13 32.53 12,700 3,400 <5 3,560 1,690 57 750 180
09/28/16 72.04 30.62 NS NS NS NS NS NS NS NS
05/08/18 73.45 29.99 NS NS NS NS NS NS NS NS
10/30/19 75.39 27.27 4,740 1,900 <5 1,790 289 49 409 115
09/24/24 78.86 23.80 1,750 <1,000 <8 <5 <12 <12 <38 <12
03/24/98 59.13 41.33 33,700 <500 <2 <2 3 <2 10.2 3.3
07/16/98 59.72 40.74 118,000 <500 <2 1,160 4,170 1,050 5,590 437
11/19/98 59.60 40.86 137,000 <500 <50 178 1,310 400 2,880 218
02/19/99 59.40 41.06 8,000 <500 <10 50.1 341 56.1 495 22.6
04/14/99 59.62 40.84 8,700 <500 <25 <25 178 36.4 487 35.6
08/13/99 61.99 38.47 425,000 <500 <500 <500 1,310 <500 3,300 <500
06/12/01 61.02 39.44 22,100 19,400 <30 57.8 1,260 265 2,990 218
08/29/01 61.51 38.95 5,800 2,200 <20 16.7 217 44.7 611 46.9
05/14/02 62.03 38.43 730 560 <33 3.9 23.4 <33 31.1 17.8
08/07/02 62.59 37.87 <500 <500 <2 <2 <2 <2 <6 3.9
11/12/02 62.99 37.47 <500 <500 <2 <2 3.1 <2 <6 <2
02/18/03 62.82 37.64 <500 <500 <2 <2 3.9 <2 7.2 <2
05/29/03 NM NM NS NS NS NS NS NS NS NS
11/06/03 63.98 36.48 <500 <500 <2 2 8 <2 13 2
06/15/04 64.55 35.91 <500 <500 6 <2 3 <2 8 <2
10/11/06 65.77 34.72 (0.03')
05/09/07 66.01 34.45 66 <2,000 <1 1 1 <1 <3 7
06/30/10 67.89 32.57 199 <1,000 <1 39 34 2 40 <2
02/13/13 68.71 31.75 <50 <1,000 <1 1 2 <1 <3 <2
09/11/13 69.11 31.35 <50 <1,000 <1 3 5 2 7 <2
07/21/14 69.65 30.81 60 <1,000 <1 1 8 <1 32 4
11/10/14 69.42 31.04 452 1,000 <1 58 72 <1 44 <2
09/28/16 71.34 29.12 NS NS NS NS NS NS NS NS
05/08/18 73.30 27.64 (1.00')
10/30/19 75.66 24.80 (2.04')
09/23/24 77.63 22.83 (0.11')
LNAPL LNAPL
MW-5
(deep, confined)
MW-4
(deep, confined)
LNAPLLNAPL
LNAPL LNAPL
LNAPL LNAPL
4 of 6
TABLE 2
Former Blanding Chevron / Facility ID 5000247, Release Site GFB
Groundwater Analytical Results (g/L)
Terracon Project No. AL067004
Sample
Identification
Sample
Date
Depth to
Water (ft-
btoc)
Relative
Ground
Water
Elevation
(feet)1
TPH-GRO TPH-DRO MTBE Benzene Toluene Ethyl-
benzene
Total
Xylenes
Naph-
thalene
1,000 1,000 200 5 1,000 700 10,000 700
10,000 10,000 200 300 3,000 4,000 10,000 700
Initial Screening Levels (µg/L)
Tier 1 Screening Criteria (µg/L)
04/14/99 61.32 38.60 1,800 <500 <2 64.2 75 2.2 54.3 <2
08/13/99 62.09 37.83 2,200 <500 <10 107 230 <10 300 18.2
06/12/01 62.99 36.93 5,200 1,800 <10 184 284 <10 646 80.7
08/29/01 63.33 36.59 3,300 1,600 <20 117 253 <20 621 67.1
05/14/02 63.76 36.16 3,500 770 <33 293 198 <33 425 76.1
08/07/02 64.46 35.46 2,700 860 <2 213 63.9 <2 135 42.3
11/12/02 64.60 35.33 690 960 <2 43.6 38.0 <2 73.6 12.5
02/18/03 64.55 35.37 1,700 3,100 <5 69.9 49.2 <5 136 35.9
05/29/03 NM NM NS NS NS NS NS NS NS NS
11/06/03 65.65 34.27 1,850 2,810 <2 150 E 66 <2 217 67
06/15/04 66.38 33.54 970 2,350 <2 68 11 <2 58 38 +
10/11/06 65.37 34.57 (0.02')
05/10/07 67.84 32.08 141 <2,000 <1 16 4 2 15 14
04/14/99 60.61 36.56 6,500 <500 <2 345 402 15.3 357 4.3
08/13/99 61.17 36 3,200 <500 <20 618 815 <20 549 <20
06/12/01 62.14 35.03 7,700 1,300 <25 1,240 850 25.6 558 35.7
08/29/01 62.55 34.62 4,500 1,200 <20 760 525 <20 625 40.1
05/14/02 63.06 34.11 18,300 1,200 <100 2,940 2,490 <100 2,170 108
08/06/02 63.70 33.47 16,900 1,400 <100 2,080 1,600 <100 1,670 106
11/12/02 63.99 33.18 13,700 1,900 <20 2,400 E 1,700 E 35.4 1,690 E 87.7
02/18/03 63.86 33.31 27,100 4,200 <25 3,110 2,330 61.6 2,390 151
05/29/03 NM NM NS NS NS NS NS NS NS NS
11/06/03 64.99 32.18 21,800 4,800 <100 4,000 2,650 <100 2,470 132
06/15/04 65.55 31.62 26,100 4,610 <100 4,411 2,577 <100 2,810 107+
10/11/06 66.81 30.36 2,150 <2,000 <1 470 104 <1 164 13
05/10/07 67.14 30.03 8,620 <2,000 <1 5,220 2,700 34 3,220 110
06/30/10 68.78 28.39 1,360 <1,000 <1 756 191 7 132 42
02/13/13 69.62 27.55 1,560 <1,000 <1 498 95 18 55 21
09/11/13 69.93 27.24 1,320 <1,000 <5 432 50 16 42 36
07/21/14 70.46 26.71 1,850 <1,000 <1 1,260 214 65 149 61
11/10/14 70.28 26.89 2,720 <1,000 <5 901 204 35 126 34
09/28/16 72.00 25.91 (0.50')
05/08/18 73.10 24.07 (0.62')
10/30/19 76.80 20.37 (2.84')
09/23/24 81.49 15.68 (3.57')
04/14/99 61.81 34.77 5,600 <500 <2 916 525 4.9 370 4.7
08/13/99 62.22 34.36 2,100 <500 <20 610 450 20.3 358 <20
06/12/01 63.17 33.41 3,600 900 <25 528 336 <25 319 <25
08/29/01 63.66 32.92 6,400 1,600 <20 1,300 734 25.8 746 32.9
05/15/02 64.11 32.47 1,900 <500 <10 475 99.1 <10 159 11.2
08/06/02 64.72 31.86 2,900 590 <20 642 93.5 <20 265 <20
11/12/02 64.99 31.60 2,000 950 <2 551 E 70.3 E <2 227 E 15.5
02/18/03 64.85 31.73 4,600 3,800 <10 747 236 <10 357 28.1
05/29/03 65.52 31.07 <500 <500 <2.0 56 7.8 <2.0 22 <2.0
11/06/03 65.94 30.64 <500 <500 <2 <2 <2 <2 <6 <2
06/15/04 66.58 30.00 <500 <500 <2 <2 <2 <2 <6 <2
10/12/06 67.77 28.81 79 <2,000 <1 9 <1 <1 <3 <1
05/10/07 68.04 28.54 315 <2,000 <1 98 43.0 <1 102 15
06/30/10 69.55 27.03 108 <1,000 <1 12 3 <1 6 5
02/13/13 70.35 26.23 <50 <1,000 <1 3 <1 <1 <3 <2
09/11/13 70.70 25.88 <50 <1,000 <1 9 2 <1 6 <2
07/21/14 71.22 26.36 <50 <1,000 <1 9 4 <1 7 4
11/10/14 70.98 26.60 265 <1,000 <1 20 1 <1 <3 <2
09/28/16 72.50 24.08 NS NS NS NS NS NS NS NS
10/30/19 75.11 21.47 <125 <1,000 <5 <5 <12 <12 <12 <12
09/24/24 80.25 16.33 (1.65')
06/12/01 65.20 28.60 <500 <500 <2 <2 <2 <2 <6 <2
08/29/01 65.55 28.25 <500 <500 <2 <2 <2 <2 <6 <2
05/14/02 66.06 27.74 <500 <500 <2 <2 <2 <2 <6 <2
08/06/02 66.71 27.09 <500 <500 <2 <2 <2 <2 <6 <2
11/11/02 67.03 26.77 <500 <500 <2 <2 2.9 <2 <6 <2
02/18/03 66.85 26.96 <500 <500 <2 <2 <2 <2 <6 <2
05/29/03 67.39 26.42 <500 <500 <2 <2 <2 <2 <6 <2
11/06/03 67.93 25.87 <500 <500 <2 <2 <2 <2 <6 <2
06/15/04 68.46 25.34 <500 <500 <2 <2 <2 <2 <6 <2
LNAPL LNAPL
LNAPL LNAPL
LNAPL
MW-7
(deep, confined)
MW-6
(deep, confined)
MW-9
(deep, confined)
MW-8
(deep, confined)
LNAPL
LNAPL
LNAPL
LNAPL
LNAPL
LNAPL
LNAPL
5 of 6
TABLE 2
Former Blanding Chevron / Facility ID 5000247, Release Site GFB
Groundwater Analytical Results (g/L)
Terracon Project No. AL067004
Sample
Identification
Sample
Date
Depth to
Water (ft-
btoc)
Relative
Ground
Water
Elevation
(feet)1
TPH-GRO TPH-DRO MTBE Benzene Toluene Ethyl-
benzene
Total
Xylenes
Naph-
thalene
1,000 1,000 200 5 1,000 700 10,000 700
10,000 10,000 200 300 3,000 4,000 10,000 700
Initial Screening Levels (µg/L)
Tier 1 Screening Criteria (µg/L)
06/12/01 56.98 27.46 1,800 1,000 <10 131 112 12.5 200 <12.9
08/29/01 57.38 27.06 <500 <500 <2 15.5 24.1 <2 10.5 <2
05/14/02 57.91 26.53 6,000 960 <33 554 75.5 <33 1,190 119
08/06/02 58.58 25.86 7,100 1,500 <33 743 128 <33 1,190 167
11/11/02 58.92 25.52 <500 <500 <2 <2 <2 <2 <6 <2
02/18/03 58.75 25.69 <500 <500 <2 <2 <2 <2 <6 <2
05/29/03 59.26 25.18 <500 <500 <2 25 <2 <2 49 <2
11/06/03 59.81 24.63 <500 <500 <2 <2 3 <2 <6 <2
06/15/04 60.32 24.12 <500 <500 <2 <2 <2 <2 <6 <2
10/12/06 61.63 22.81 <50 <2,000 <1 <1 <1 <1 <3 <1
05/10/07 61.85 22.59 70 <2,000 <1 1 <1 <1 <3 <1
06/30/10 63.37 21.07 107 <1,000 <1 35 11 2 9 <2
02/12/13 64.06 20.38 76 <1,000 <1 48 <1 <1 <3 <2
09/11/13 65.61 18.83 131 <1,000 <1 82 <1 <1 <3 <2
07/21/14 64.99 19.45 95 <1,000 <1 51 <1 <1 <3 <2
11/10/14 64.64 19.80 <50 <1,000 <1 10 1 <1 <3 <2
09/28/16 66.00 18.44 <222 <200 <5 100 <5 <5 <5 <5
05/08/18 67.12 17.34 <125 <1,000 <5 <5 <12 <12 <12 <12
10/30/19 68.32 16.12 <125 <1,000 <5 <5 <12 <12 <12 <12
09/24/24 72.31 12.13 <125 <1,000 <8 <5 <12 <12 <38 <12
05/15/02 NA NA <500 <500 <2 <2 <2 <2 <6 <2
08/06/02 NA NA <500 <500 <2 <2 <2 <2 <6 <2
11/12/02 NA NA <500 <500 <2 <2 <2 <2 <6 <2
02/18/03 NA NA <500 <500 <2 <2 <2 <2 <6 <2
05/29/03 NA NA NS NS NS NS NS NS NS NS
11/06/03 NA NA <500 <500 <2 <2 <2 <2 <6 <2
06/15/04 NA NA <500 <500 <2 <2 <2 <2 <6 <2
10/12/06 NA NA <50 <2,000 <1 <1 <1 <1 <3 <1
05/10/07 NA NA <50 <2,000 <1 <1 <1 <1 <3 <1
06/30/10 NA NA <50 <1,000 <1 <1 <1 <1 <3 <2
02/12/13 NA NA <50 <1,000 <1 <1 <1 <1 <3 <2
09/11/13 NA NA <50 <1,000 <1 <1 <1 <1 <3 <2
07/21/14 NA NA <50 <1,000 <1 <1 <1 <1 <3 <2
11/10/14 NA NA <50 <1000 <1 <1 <1 <1 <3 <2
09/28/16 NA NA <222 <200 <5 <2 <5 <5 <5 <5
05/08/18 NA NA
10/30/19 NA NA
09/24/24 NA NA <125 <1,000 <8 <5 <12 <12 <38 <12
Explanation of Abbreviations
1 = LNAPL thickness, where available, in parentheses NS = Not Sampled
NM = Not Measured Bold Analytical result exceeds Initial Screening Level
NA = Not Available LNAPL = Light Non-Aqueous Phase Liquid
µg/L = Micrograms per liter
NS
Blanding
Municipal
Well
MW-10
(deep, confined)
NS - Well Off Line
6 of 6
Appendix C
Chain of Custody and Laboratory Data Sheets
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
Terracon IHI
Attn: Andrew Turner
6949 South High Tech Drive
Midvale, UT 84047
Work Order: 24I2111
Project: DERR Blanding Chevron LUST,
Blanding AL067004
10/2/2024
Approved By:
Mark Broadhead, 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
Terracon IHI
Andrew Turner
6949 South High Tech Drive
Midvale, UT 84047
PO#:
Receipt:
Date Reported:
Project Name:
Project AL067004
9/24/24 17:00 @ 4.7 °C
10/2/2024
DERR Blanding Chevron LUST, Blanding
AL067004
Sample ID: MW-4B
Lab ID: 24I2111-01Matrix: Water
Flag(s)Units
Analysis
Date/Time
Date Sampled: 9/23/24 14:30
Preparation
Date/Time
Sampled By: JR Murphy
Minimum
Reporting
Limit MethodResult
Diesel Range with silica gel cleanup
mg/L 10/2/2410/2/241.0 EPA 8015 C6.8Diesel Range Organics
MBTEXn
mg/L 9/27/249/27/240.050 EPA 8260D/5030B1.78Benzene
mg/L 9/27/249/27/240.012 EPA 8260D/5030B0.792Ethylbenzene
mg/L 9/27/249/27/240.008 EPA 8260D/5030BNDMethyl tert-Butyl Ether (MTBE)
mg/L 9/27/249/27/240.012 EPA 8260D/5030B0.692Naphthalene
mg/L 9/27/249/27/240.012 EPA 8260D/5030B0.621Toluene
mg/L 9/27/249/27/240.038 EPA 8260D/5030B1.70Xylenes, total
Gasoline Range
mg/L 9/27/249/27/240.125 EPA 8260B/C 5030A/[CALC]12.1Gasoline Range Organics
Project Name: DERR Blanding Chevron LUST, Blanding AL06700 CtF WO#: 24I2111
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
Terracon IHI
Andrew Turner
6949 South High Tech Drive
Midvale, UT 84047
PO#:
Receipt:
Date Reported:
Project Name:
Project AL067004
9/24/24 17:00 @ 4.7 °C
10/2/2024
DERR Blanding Chevron LUST, Blanding
AL067004
Sample ID: MW-8B
Lab ID: 24I2111-02Matrix: Water
Flag(s)Units
Analysis
Date/Time
Date Sampled: 9/23/24 18:30
Preparation
Date/Time
Sampled By: JR Murphy
Minimum
Reporting
Limit MethodResult
Diesel Range with silica gel cleanup
mg/L 10/2/2410/2/241.0 EPA 8015 CNDDiesel Range Organics
MBTEXn
mg/L 9/27/249/27/240.005 EPA 8260D/5030BNDBenzene
mg/L 9/27/249/27/240.012 EPA 8260D/5030BNDEthylbenzene
mg/L 9/27/249/27/240.008 EPA 8260D/5030BNDMethyl tert-Butyl Ether (MTBE)
mg/L 9/27/249/27/240.012 EPA 8260D/5030BNDNaphthalene
mg/L 9/27/249/27/240.012 EPA 8260D/5030BNDToluene
mg/L 9/27/249/27/240.038 EPA 8260D/5030BNDXylenes, total
Gasoline Range
mg/L 9/27/249/27/240.125 EPA 8260B/C 5030A/[CALC]NDGasoline Range Organics
Project Name: DERR Blanding Chevron LUST, Blanding AL06700 CtF WO#: 24I2111
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
Terracon IHI
Andrew Turner
6949 South High Tech Drive
Midvale, UT 84047
PO#:
Receipt:
Date Reported:
Project Name:
Project AL067004
9/24/24 17:00 @ 4.7 °C
10/2/2024
DERR Blanding Chevron LUST, Blanding
AL067004
Sample ID: MW-4
Lab ID: 24I2111-03Matrix: Water
Flag(s)Units
Analysis
Date/Time
Date Sampled: 9/24/24 9:15
Preparation
Date/Time
Sampled By: JR Murphy
Minimum
Reporting
Limit MethodResult
Diesel Range with silica gel cleanup
mg/L 9/25/249/25/241.0 EPA 8015 CNDDiesel Range Organics
MBTEXn
mg/L 9/27/249/27/240.005 EPA 8260D/5030B0.955Benzene
mg/L 9/27/249/27/240.012 EPA 8260D/5030BNDEthylbenzene
mg/L 9/27/249/27/240.008 EPA 8260D/5030BNDMethyl tert-Butyl Ether (MTBE)
mg/L 9/27/249/27/240.012 EPA 8260D/5030B0.036Naphthalene
mg/L 9/27/249/27/240.012 EPA 8260D/5030B0.051Toluene
mg/L 9/27/249/27/240.038 EPA 8260D/5030B0.110Xylenes, total
Gasoline Range
mg/L 9/27/249/27/240.125 EPA 8260B/C 5030A/[CALC]1.75Gasoline Range Organics
Project Name: DERR Blanding Chevron LUST, Blanding AL06700 CtF WO#: 24I2111
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
Terracon IHI
Andrew Turner
6949 South High Tech Drive
Midvale, UT 84047
PO#:
Receipt:
Date Reported:
Project Name:
Project AL067004
9/24/24 17:00 @ 4.7 °C
10/2/2024
DERR Blanding Chevron LUST, Blanding
AL067004
Sample ID: MW-10
Lab ID: 24I2111-04Matrix: Water
Flag(s)Units
Analysis
Date/Time
Date Sampled: 9/24/24 10:45
Preparation
Date/Time
Sampled By: JR Murphy
Minimum
Reporting
Limit MethodResult
Diesel Range with silica gel cleanup
mg/L 10/2/2410/2/241.0 EPA 8015 CNDDiesel Range Organics
MBTEXn
mg/L 9/27/249/27/240.005 EPA 8260D/5030BNDBenzene
mg/L 9/27/249/27/240.012 EPA 8260D/5030BNDEthylbenzene
mg/L 9/27/249/27/240.008 EPA 8260D/5030BNDMethyl tert-Butyl Ether (MTBE)
mg/L 9/27/249/27/240.012 EPA 8260D/5030BNDNaphthalene
mg/L 9/27/249/27/240.012 EPA 8260D/5030BNDToluene
mg/L 9/27/249/27/240.038 EPA 8260D/5030BNDXylenes, total
Gasoline Range
mg/L 9/27/249/27/240.125 EPA 8260B/C 5030A/[CALC]NDGasoline Range Organics
Project Name: DERR Blanding Chevron LUST, Blanding AL06700 CtF WO#: 24I2111
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
Terracon IHI
Andrew Turner
6949 South High Tech Drive
Midvale, UT 84047
PO#:
Receipt:
Date Reported:
Project Name:
Project AL067004
9/24/24 17:00 @ 4.7 °C
10/2/2024
DERR Blanding Chevron LUST, Blanding
AL067004
Sample ID: BMW
Lab ID: 24I2111-05Matrix: Water
Flag(s)Units
Analysis
Date/Time
Date Sampled: 9/24/24 11:15
Preparation
Date/Time
Sampled By: JR Murphy
Minimum
Reporting
Limit MethodResult
Diesel Range with silica gel cleanup
mg/L 10/2/2410/2/241.0 EPA 8015 CNDDiesel Range Organics
MBTEXn
mg/L 9/27/249/27/240.005 EPA 8260D/5030BNDBenzene
mg/L 9/27/249/27/240.012 EPA 8260D/5030BNDEthylbenzene
mg/L 9/27/249/27/240.008 EPA 8260D/5030BNDMethyl tert-Butyl Ether (MTBE)
mg/L 9/27/249/27/240.012 EPA 8260D/5030BNDNaphthalene
mg/L 9/27/249/27/240.012 EPA 8260D/5030BNDToluene
mg/L 9/27/249/27/240.038 EPA 8260D/5030BNDXylenes, total
Gasoline Range
mg/L 9/27/249/27/240.125 EPA 8260B/C 5030A/[CALC]NDGasoline Range Organics
Project Name: DERR Blanding Chevron LUST, Blanding AL06700 CtF WO#: 24I2111
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
Terracon IHI
Andrew Turner
6949 South High Tech Drive
Midvale, UT 84047
PO#:
Receipt:
Date Reported:
Project Name:
Project AL067004
9/24/24 17:00 @ 4.7 °C
10/2/2024
DERR Blanding Chevron LUST, Blanding
AL067004
Sample ID: Trip Blank
Lab ID: 24I2111-06Matrix: Water
Flag(s)Units
Analysis
Date/Time
Date Sampled: 9/24/24 0:00
Preparation
Date/Time
Sampled By: JR Murphy
Minimum
Reporting
Limit MethodResult
MBTEXn
mg/L 9/27/249/27/240.005 EPA 8260D/5030BNDBenzene
mg/L 9/27/249/27/240.012 EPA 8260D/5030BNDEthylbenzene
mg/L 9/27/249/27/240.008 EPA 8260D/5030BNDMethyl tert-Butyl Ether (MTBE)
mg/L 9/27/249/27/240.012 EPA 8260D/5030BNDNaphthalene
mg/L 9/27/249/27/240.012 EPA 8260D/5030BNDToluene
mg/L 9/27/249/27/240.038 EPA 8260D/5030BNDXylenes, total
Project Name: DERR Blanding Chevron LUST, Blanding AL06700 CtF WO#: 24I2111
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
Terracon IHI
Andrew Turner
6949 South High Tech Drive
Midvale, UT 84047
PO#:
Receipt:
Date Reported:
Project Name:
Project AL067004
9/24/24 17:00 @ 4.7 °C
10/2/2024
DERR Blanding Chevron LUST, Blanding
AL067004
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: DERR Blanding Chevron LUST, Blanding AL06700 CtF WO#: 24I2111
www.ChemtechFord.com
Page 8 of 11Page 8 of 11
Page 9 of 11
QC Report for Work Order (WO) - 24I2111
% Rec RPD RPD Max MRL DFResultSpk ValueLimitsSource ConcAnalyte
Blank - EPA 8015 C
QC Sample ID: BYI1217-BLK1 Batch: BYI1217
Date Prepared: 09/25/2024 Date Analyzed: 09/25/2024
Diesel Range Organics ND 1.0 1.00
QC Sample ID: BYJ0087-BLK1 Batch: BYJ0087
Date Prepared: 10/02/2024 Date Analyzed: 10/02/2024
Diesel Range Organics ND 1.0 1.00
LCS - EPA 8015 C
QC Sample ID: BYI1217-BS1 Batch: BYI1217
Date Prepared: 09/25/2024 Date Analyzed: 09/25/2024
Diesel Range Organics 109 50 - 150 43 40.0 1.0 1.00
QC Sample ID: BYJ0087-BS1 Batch: BYJ0087
Date Prepared: 10/02/2024 Date Analyzed: 10/02/2024
Diesel Range Organics 91.3 50 - 150 37 40.0 1.0 1.00
Matrix Spike - EPA 8015 C
QC Sample ID: BYI1217-MS1 QC Source Sample: XXXXXXX-XXBatch: BYI1217
Date Prepared: 09/25/2024 Date Analyzed: 09/25/2024
Diesel Range Organics 106 50 - 150 43 ND 40.0 1.0 1.00
QC Sample ID: BYJ0087-MS1 QC Source Sample: 24I2111-02Batch: BYJ0087
Date Prepared: 10/02/2024 Date Analyzed: 10/02/2024
Diesel Range Organics 102 50 - 150 41 ND 40.0 1.0 1.00
Matrix Spike Dup - EPA 8015 C
QC Sample ID: BYI1217-MSD1 QC Source Sample: XXXXXXX-XXBatch: BYI1217
Date Prepared: 09/25/2024 Date Analyzed: 09/25/2024
Diesel Range Organics 102 3.69 50 - 150 20 41 ND 40.0 1.0 1.00
QC Sample ID: BYJ0087-MSD1 QC Source Sample: 24I2111-02Batch: BYJ0087
Date Prepared: 10/02/2024 Date Analyzed: 10/02/2024
Diesel Range Organics 92.5 9.38 50 - 150 20 37 ND 40.0 1.0 1.00
CtF WO#: 24I2111
www.ChemtechFord.com Page 10 of 11
QC Report for Work Order (WO) - 24I2111
% Rec RPD RPD Max MRL DFResultSpk ValueLimitsSource ConcAnalyte
Blank - EPA 8260D
QC Sample ID: BYI1383-BLK1 Batch: BYI1383
Date Prepared: 09/27/2024 Date Analyzed: 09/27/2024
Benzene ND 0.0004 1.00
Ethylbenzene ND 0.001 1.00
Methyl tert-Butyl Ether (MTBE)ND 0.0006 1.00
Naphthalene ND 0.001 1.00
Toluene ND 0.001 1.00
Xylenes, total ND 0.003 1.00
LCS - EPA 8260D
QC Sample ID: BYI1383-BS1 Batch: BYI1383
Date Prepared: 09/27/2024 Date Analyzed: 09/27/2024
Benzene 87.5 70 - 130 0.009 0.0100 0.0004 1.00
Ethylbenzene 92.8 70 - 130 0.009 0.0100 0.001 1.00
Methyl tert-Butyl Ether (MTBE)70.3 70 - 130 0.007 0.0100 0.0006 1.00
Naphthalene 99.4 70 - 130 0.010 0.0100 0.001 1.00
Toluene 88.2 70 - 130 0.009 0.0100 0.001 1.00
Xylenes, total 96.1 70 - 130 0.029 0.0300 0.003 1.00
Matrix Spike - EPA 8260D
QC Sample ID: BYI1383-MS1 QC Source Sample: XXXXXXX-XXBatch: BYI1383
Date Prepared: 09/27/2024 Date Analyzed: 09/27/2024
Benzene 82.9 70 - 130 2.07 ND 2.50 0.100 1.00
Ethylbenzene 86.8 70 - 130 2.17 ND 2.50 0.250 1.00
Methyl tert-Butyl Ether (MTBE)64.5 70 - 130 1.61 ND 2.50 0.150 1.00
QM-RPD - The recovery was outside acceptance limits for the MS and/or MSD. The RPD between the MS and MSD was
acceptable and indicates the recovery is due to matrix interference. The batch was accepted based on the acceptable
recovery of the LCS and the RPD.
Naphthalene 84.3 70 - 130 2.11 ND 2.50 0.250 1.00
Toluene 88.0 70 - 130 2.20 ND 2.50 0.250 1.00
Xylenes, total 90.7 70 - 130 6.80 ND 7.50 0.750 1.00
Matrix Spike Dup - EPA 8260D
QC Sample ID: BYI1383-MSD1 QC Source Sample: XXXXXXX-XXBatch: BYI1383
Date Prepared: 09/27/2024 Date Analyzed: 09/27/2024
Benzene 79.7 3.94 70 - 130 20 1.99 ND 2.50 0.100 1.00
Ethylbenzene 84.0 3.28 70 - 130 25 2.10 ND 2.50 0.250 1.00
Methyl tert-Butyl Ether (MTBE)75.6 15.8 70 - 130 25 1.89 ND 2.50 0.150 1.00
Naphthalene 93.1 9.92 70 - 130 25 2.33 ND 2.50 0.250 1.00
Toluene 80.9 8.41 70 - 130 20 2.02 ND 2.50 0.250 1.00
Xylenes, total 88.9 2.00 70 - 130 20 6.67 ND 7.50 0.750 1.00
CtF WO#: 24I2111
www.ChemtechFord.com Page 11 of 11