DERR-2025-003336

COVER PAGE
March 2025 Groundwater
Monitoring Report
Former Blanding Chevron
200 North Highway 191 Blanding, Utah
Facility ID #5000247 Release ID GFB
April 29, 2025 | 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
April 29, 2025
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:March 2025 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 March 2025 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
Senior Project Manager Senior Scientific Consultant
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 March 2025 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 ....................................................................................... 6
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, March 2025
Exhibit 4:Deep Aquifer Potentiometric Surface Map, March 2025
Appendix B Groundwater Data Tables 1 & 2
Appendix C Chain of Custody and Laboratory Data Sheets
March 2025 Groundwater Monitoring Report
Former Blanding Chevron | Blanding, Utah
April 29, 2025 | 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).
Appendix A (Exhibit 1) presents a topographical map of the area.Exhibit 2 is a site diagram
depicting monitoring well locations.Exhibits 3 and 4 depict groundwater elevation contours
in the shallow and deep aquifers, respectively, based on depth-to-groundwater
measurements that were collected on March 19 and 20, 2025.
1.2 Project Background
The March 2025 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 (Appendix A Exhibit 2). 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, September 2024, December 2024, and March 2025 monitoring events.
LNAPL was not observed in the shallow monitoring well MW-3B, which previously
documented LNAPL during the October 2019, September 2024, and December 2024
monitoring events. The most recent event in which LNAPL was not present was the May
2018 monitoring event. LNAPL was observed for the first time in the deep monitoring well
MW-8 during the September 2024 event with a measured thickness of approximately 1.65
feet, and LNAPL was present again in the December 2024 and March 2025 sampling events
with measured thicknesses of 0.98 feet and 0.66 feet, respectively. Although no LNAPL was
March 2025 Groundwater Monitoring Report
Former Blanding Chevron | Blanding, Utah
April 29, 2025 | Terracon Project No. AL067004
Facilities | Environmental | Geotechnical | Materials 2
present in shallow monitoring well MW-4B, dissolved petroleum constituents concentrations
remain elevated.
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-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, absorbent socks in monitoring wells MW-3, MW-3B, MW-5, MW-7,
and MW-8 were changed out and replaced with new ones.
The remainder of this report documents the results of this groundwater monitoring event
completed pursuant the work plan to conduct quarterly monitoring 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;
March 2025 Groundwater Monitoring Report
Former Blanding Chevron | Blanding, Utah
April 29, 2025 | Terracon Project No. AL067004
Facilities | Environmental | Geotechnical | Materials 3
the data, interpretations, findings, and our recommendations are based solely upon data
obtained at the time and within the scope of these services.
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 March 2025 Groundwater Sampling Event
On March 19 and 20, 2025, 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 during the March 2025
monitoring event, groundwater samples were not collected at these locations. Groundwater
samples for MW-4, MW-4B, and MW-8B were collected on March 19, 2025; groundwater
samples for MW-3B, MW-10, and the Blanding City public access well (Blanding Municipal
Well or BMW) were collected on March 20, 2025.
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).
March 2025 Groundwater Monitoring Report
Former Blanding Chevron | Blanding, Utah
April 29, 2025 | Terracon Project No. AL067004
Facilities | Environmental | Geotechnical | Materials 4
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 28
gallons from MW-3B, 6 gallons from MW-4, 4 gallons from MW-8B, and 10 gallons from MW-
10. MW-4B became dry after bailing 15 gallons of the calculated 26 gallons. After 30
minutes, recharge was sufficient for groundwater sample collection.
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 kept with the sample cooler 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 five groundwater samples and field blank sample (Blanding Municipal 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 and TPH-GRO.
The samples were analyzed using the following methods:
Analysis Sample Type No. of
Samples Laboratory Method
MBTEXN and TPH-GRO
Groundwater,
Trip Blank, and
Field Blank
7 EPA Method 8260D /
8260B
TPH-DRO (SGT)Groundwater and
Field Blank 6 EPA Method 8015C SGT
March 2025 Groundwater Monitoring Report
Former Blanding Chevron | Blanding, Utah
April 29, 2025 | Terracon Project No. AL067004
Facilities | Environmental | Geotechnical | Materials 5
The executed chain-of-custody form and laboratory data sheets are provided in Appendix C.
4.0 Data Evaluation
Please refer to Table 1 (Appendix B) for a summary of well construction details and 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 5.83 to 8.11 feet below ground surface (bgs), which is between 0.28 to 1.01 feet
shallower than the December 2024 sampling event, except for MW-4B which was 0.29 feet
deeper than the December 2024 sampling event. Higher groundwater elevations in the
shallow aquifer are likely due to spring snowmelt runoff from the mountains and
precipitation events. Depth-to-water in the deeper aquifer was measured to range between
72.42 to 80.25 feet bgs, which was generally consistent with the December 2024 sampling
event. LNAPL was observed in deep wells MW-3 (2.90 feet thick), MW-5 (2.54 feet thick),
MW-7 (0.79 feet thick), and MW-8 (0.66 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 to the south-southeast 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 well MW-10 or the Blanding Municipal Well. A
low concentration of naphthalene, more than an order of magnitude below its ISL, was
reported in MW-8B. TPH-GRO was reported in deep well MW-4 at 2,050 µg/L, which
exceeded the ISL but was below the Tier 1 criteria. Benzene was reported at 1,050 µg/L in
deep well MW-4, which exceeded both its ISL and Tier 1 criteria. Shallow monitoring well
MW-3B results reported toluene (2,380 µg/L) and ethylbenzene (1,660 µg/L) exceeding
their ISLs and TPH-GRO (48,300 µg/L), TPH-DRO (40,100 µg/L), benzene (1,320 µg/L), and
naphthalene (1,210 µg/L) exceeding their Tier 1 criteria. Shallow monitoring well MW-4B
results reported TPH-DRO (4,400 µg/L) and ethylbenzene (1,060 µg/L) exceeding their
ISLs, and TPH-GRO (13,200 µg/L) and benzene (1,260 µg/L) exceeding their Tier 1 criteria.
March 2025 Groundwater Monitoring Report
Former Blanding Chevron | Blanding, Utah
April 29, 2025 | Terracon Project No. AL067004
Facilities | Environmental | Geotechnical | Materials 6
No samples were collected from monitoring wells MW-3, 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 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.
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 except where noted the results were within
acceptable limits set by the laboratory. Aside from one flag (ISTD-01), listed for TPH-DRO
on the groundwater sample from shallow monitoring well MW-4B, the laboratory reported
the analytical results without qualification. ISTD-01 indicates there was a failing internal
standard due to matrix interference. As the TPH-DRO results in MW-4B are consistent with
prior sampling events, and because other analytes that were not flagged exceed the ISLs or
Tier 1 screening criteria, the ISTD-01 flag is not anticipated to affect the conclusions drawn
in this report that petroleum is present in MW-4B at concentrations exceeding Tier 1
screening criteria.
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
An LNAPL plume was observed in the deep aquifer, as indicated by the presence of free
product in deep wells MW-3, MW-5, MW-7 and MW-8. LNAPL thicknesses in MW-5 (2.54 feet
thick), MW-7 (0.79 feet thick), and MW-8 (0.66 feet thick) were less than the previous
measurements from the December 2024 event. However, product thickness in well MW-3
(2.90 feet thick) was slightly greater than the previous sampling event. All product
thickness measurements are tabulated on Table 1 (Appendix B).
The groundwater elevations in the deeper aquifer have remained relatively stable since the
last monitoring event in December 2024. Shallow wells have seen an increase in
groundwater elevation with MW-3B (1.01 feet higher) and MW-8B (0.28 feet higher), with
the exception of the elevation in MW-4B which was 0.29 feet lower. Historically,
groundwater elevations in deep monitoring wells (MW-3, -4, -5, -7, and -8) have dropped at
least 18 feet since 1998. It is possible that the drop in groundwater elevation is affecting
the amount and distribution of LNAPL that is present in several of these deep aquifer wells.
March 2025 Groundwater Monitoring Report
Former Blanding Chevron | Blanding, Utah
April 29, 2025 | Terracon Project No. AL067004
Facilities | Environmental | Geotechnical | Materials 7
Petroleum hydrocarbon impacts to the shallow aquifer appear to be relatively stable over
time. Historically MW-3B 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 (1,260 µg/L) exceeding Tier 1 screening levels,
and TPH-DRO (4,400 µg/L) and ethylbenzene (1,060 µg/L) exceeding ISLs. While TPH-GRO
(13,200 µg/L) did exceed Tier 1 screening levels, levels have generally trended downward
since 2007. However, this monitoring event had a slight increase in TPH-GRO concentration
in MW-4B. Analysis of groundwater from shallow monitoring well MW-8B indicates that none
of the petroleum constituents were detected above their analytical method reporting limits
with the exception of naphthalene. 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.
Benzene (1,050 µg/L) was identified above its Tier 1 screening criteria in MW-4. TPH-GRO
(2,050 µg/L) was identified in monitoring well MW-4, which exceeds the ISL but is below the
Tier 1 criteria. All other petroleum constituent concentrations were below ISLs or laboratory
reporting limits in MW-4. Benzene was below laboratory reporting limits in the September
2024 monitoring event. Historically, MW-4 had benzene concentrations above the Tier 1
screening level and toluene concentrations above the ISL. Analytical results from MW-10
show that none of the constituents analyzed were reported 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.
Overall, petroleum constituent concentrations have had a slight increase since the
December 2024 sampling event which may be attributed to seasonal fluctuation in the
water table. The absence of LNAPL in shallow monitoring well MW-3B during this monitoring
event and the appearance of LNAPL in deep monitoring well MW-8 during the September
2024 monitoring event and continued presence of LNAPL in MW-7 may indicate that the
LNAPL plume may be migrating down-gradient from the tank basin area and/or the increase
in depth-to-groundwater 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
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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
Topographic Map
1
PH. [phone]
Midvale, Utah 840476949 High Tech Drive
ABA
AST
DATA SOURCES:
ESRI WMS - World Aerial Imagery, OpenStreetMap
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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
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
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MW-5
MW-3
MW-7
MW-8
MW-10
MW-3B
MW-8B
MW-4B
0 150 30075
Feet
³
³
@A Shallow Monitoring Well
@A Deep Monitoring Well
Blanding City Well
Former UST Area
Appendix B
Groundwater Data Tables
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
12/17/24 6.84 90.04 0.04 90.07
03/20/25 5.83 91.05 ND 91.05
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
10-20 96.88
10-20 101.26
MW-3B
(shallow,
unconfined)
4 20.37
20.44MW-4B
(shallow,
unconfined)
4
Page 1 of 8
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
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
12/17/24 6.99 94.27 ND 94.27
03/19/25 7.28 93.98 ND 93.98
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
12/17/24 8.39 87.62 ND 87.62
03/19/25 8.11 87.90 ND 87.90
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
96.01
96.00
5-17
MW-9B
(shallow,
unconfined)
10-202
MW-8B
(shallow,
unconfined)
2 16.92
20.29
Page 2 of 8
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 60.09 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
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
104.7070-90
70-90MW-2
(deep,
confined)
2 100.9784.31
MW-1
(deep,
confined)
2 90.19
Page 3 of 8
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 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
12/17/24 79.37 18.65 2.88 20.75
03/19/25 79.52 18.50 2.90 20.62
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
70-90 98.022
102.6670-90MW-4
(deep,
confined)
2 89.95
89.85MW-3
(deep,
confined)
Page 4 of 8
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
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
12/17/24 78.88 23.78 ND 23.78
03/19/25 79.10 23.56 ND 23.56
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
12/17/24 80.36 20.10 2.93 22.24
03/19/25 80.25 20.21 2.54 22.06
MW-5
(deep,
confined)
2 70-90 100.4689.94
Page 5 of 8
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
12/17/24 80.01 17.16 1.52 18.27
03/19/25 79.58 17.59 0.79 18.17
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
MW-8
(deep,
confined)
2
90.15 70-90 97.17
96.58
MW-7
(deep,
confined)
2
2MW-6
(deep,
confined)
99.9270-90
90.09 70-90
90.14
Page 6 of 8
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
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
12/17/24 79.92 16.66 0.98 17.38
03/19/25 79.78 16.80 0.66 17.28
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
MW-9
(deep,
confined)
2 92.01 60-90 93.80
Page 7 of 8
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 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
12/17/24 72.37 12.07 ND 12.07
03/20/25 72.42 12.02 ND 12.02
hm = Uncorrected groundwater elevation (ft)
Ho = Thickness of free product in well (ft)
NM = Not Measured
ND = Not Detected
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:
rw = Density of water = 1 g/mL
ro = Density of product = 0.73 g/mL (typical range for gasoline is from 0.71 - 0.77 g/mL)
84.44MW-10
(deep,
confined)
2 93.25 60-90
Page 8 of 8
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 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 4,850 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')
12/17/24 6.84 90.04 (0.04')
03/20/25 5.83 91.05 48,300 40,100 <8 1,320 2,380 1,660 6,410 1,210
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
12/17/24 6.99 94.27 10,300 3,800 <8 1,003 1,100 987 2,920 581
03/19/25 7.28 93.98 13,200 4,400 <8 1,260 726 1,060 2,510 585
LNAPL
LNAPL LNAPL
LNAPL
LNAPL
LNAPL
LNAPL
LNAPL
LNAPL
LNAPL
LNAPL
LNAPL
LNAPL
LNAPL
LNAPL
LNAPL
LNAPL
LNAPL
LNAPL LNAPL
LNAPL
LNAPL LNAPL
LNAPL
Initial Screening Levels (µg/L)
Tier 1 Screening Criteria (µg/L)
MW-3B
(shallow,
unconfined)
MW-4B
(shallow,
unconfined)
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
12/17/24 8.39 87.62 <125 <1,000 <8 <5 <12 <12 <38 <12
03/19/25 8.11 87.90 <1,250 <1,000 <8 <5 <12 <12 <38 18
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')
12/17/24 79.37 18.65 (2.88')
03/19/25 79.52 18.50 (2.90')
LNAPL LNAPL
LNAPL LNAPL
LNAPLLNAPL
LNAPL LNAPL
LNAPL
LNAPL
LNAPL
LNAPL
LNAPL
LNAPL
LNAPL
LNAPL LNAPL
LNAPL
LNAPL LNAPL
MW-2
(deep, confined)
MW-3
(deep, confined)
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
12/17/24 78.88 23.78 1,660 1,700 <8 779 95 <12 164 39
03/19/25 79.10 23.56 2,050 <1,000 <8 1,050 109 <12 163 60
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')
12/17/24 80.36 20.10 (2.93')
03/19/25 80.25 20.21 (2.54')
LNAPL LNAPL
LNAPL
LNAPL LNAPL
LNAPL LNAPL
LNAPLLNAPL
MW-5
(deep, confined)
MW-4
(deep, confined)
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')
12/17/24 80.01 17.16 (1.52')
03/19/25 79.58 17.59 (0.79')
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')
12/17/24 79.92 16.66 (0.98')
03/19/25 79.78 16.80 (0.66')
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-9
(deep, confined)
MW-8
(deep, confined)
LNAPL
LNAPL
LNAPL
LNAPL
MW-7
(deep, confined)
MW-6
(deep, confined)
LNAPL LNAPL
LNAPL LNAPL
LNAPL
LNAPL LNAPL
LNAPLLNAPL
LNAPLLNAPL
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
12/17/24 72.37 12.07 <125 <1,000 <8 <5 <12 <12 <38 <12
03/20/25 72.42 12.02 <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
12/18/24 NA NA <125 <1,000 <8 <5 <12 <12 <38 <12
03/20/25 NA NA <125 <1,000 <8 <5 <12 <12 <38 <12
Explanation of Abbreviations
1 = LNAPL thickness, where available, in parentheses
NM = Not Measured Bold value exceeds Method Detection Limit (MDL).
NA = Not Available
µg/L Color shaded value exceeds screening level.
LNAPL = Light Non-Aqueous Phase Liquid
NS = Not Sampled
NS - Well Off Line
Blanding
Municipal
Well
MW-10
(deep, confined)
= Micrograms per liter
NS
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: 25C1636
Project: DERR Blanding Chevron LUST,
Blanding AL067004
3/28/2025
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 13
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:
AL067004
3/20/25 16:11 @ 3.3 °C
3/28/2025
DERR Blanding Chevron LUST, Blanding
AL067004
Sample ID: MW-4
Lab ID: 25C1636-01Matrix: Water
Flag(s)Units
Analysis
Date/Time
Date Sampled: 3/19/25 14:15
Preparation
Date/Time
Sampled By: John Murphy
Minimum
Reporting
Limit MethodResult
Diesel Range with Silica Gel Cleanup
mg/L 3/25/253/24/251.0 EPA 8015 CNDDiesel Range Organics
MBTEXn
mg/L 3/23/253/23/250.100 EPA 8260D/5030B1.05Benzene
mg/L 3/23/253/23/250.012 EPA 8260D/5030BNDEthylbenzene
mg/L 3/23/253/23/250.008 EPA 8260D/5030BNDMethyl-tert-butyl ether (MTBE)
mg/L 3/23/253/23/250.012 EPA 8260D/5030B0.060Naphthalene
mg/L 3/23/253/23/250.012 EPA 8260D/5030B0.109Toluene
mg/L 3/23/253/23/250.038 EPA 8260D/5030B0.163Xylenes, total
Gasoline Range
mg/L 3/23/253/23/250.125 EPA 8260B/C 5030A/[CALC]2.05Gasoline Range Organics
Project Name: DERR Blanding Chevron LUST, Blanding AL06700 CtF WO#: 25C1636
www.ChemtechFord.com
Page 2 of 13Page 2 of 13
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:
AL067004
3/20/25 16:11 @ 3.3 °C
3/28/2025
DERR Blanding Chevron LUST, Blanding
AL067004
Sample ID: MW-4B
Lab ID: 25C1636-02Matrix: Water
Flag(s)Units
Analysis
Date/Time
Date Sampled: 3/19/25 15:15
Preparation
Date/Time
Sampled By: John Murphy
Minimum
Reporting
Limit MethodResult
Diesel Range with Silica Gel Cleanup
mg/L ISTD-013/25/253/24/251.0 EPA 8015 C4.4Diesel Range Organics
MBTEXn
mg/L 3/23/253/23/250.100 EPA 8260D/5030B1.26Benzene
mg/L 3/23/253/23/250.250 EPA 8260D/5030B1.06Ethylbenzene
mg/L 3/23/253/23/250.008 EPA 8260D/5030BNDMethyl-tert-butyl ether (MTBE)
mg/L 3/23/253/23/250.012 EPA 8260D/5030B0.585Naphthalene
mg/L 3/23/253/23/250.012 EPA 8260D/5030B0.726Toluene
mg/L 3/23/253/23/250.750 EPA 8260D/5030B2.51Xylenes, total
Gasoline Range
mg/L 3/23/253/23/250.750 EPA 8260B/C 5030A/[CALC]13.2Gasoline Range Organics
Project Name: DERR Blanding Chevron LUST, Blanding AL06700 CtF WO#: 25C1636
www.ChemtechFord.com
Page 3 of 13Page 3 of 13
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:
AL067004
3/20/25 16:11 @ 3.3 °C
3/28/2025
DERR Blanding Chevron LUST, Blanding
AL067004
Sample ID: MW-8B
Lab ID: 25C1636-03Matrix: Water
Flag(s)Units
Analysis
Date/Time
Date Sampled: 3/19/25 17:20
Preparation
Date/Time
Sampled By: John Murphy
Minimum
Reporting
Limit MethodResult
Diesel Range with Silica Gel Cleanup
mg/L 3/25/253/24/251.0 EPA 8015 CNDDiesel Range Organics
MBTEXn
mg/L 3/23/253/23/250.005 EPA 8260D/5030BNDBenzene
mg/L 3/23/253/23/250.012 EPA 8260D/5030BNDEthylbenzene
mg/L 3/23/253/23/250.008 EPA 8260D/5030BNDMethyl-tert-butyl ether (MTBE)
mg/L 3/23/253/23/250.012 EPA 8260D/5030B0.018Naphthalene
mg/L 3/23/253/23/250.012 EPA 8260D/5030BNDToluene
mg/L 3/23/253/23/250.038 EPA 8260D/5030BNDXylenes, total
Gasoline Range
mg/L 3/23/253/23/250.125 EPA 8260B/C 5030A/[CALC]NDGasoline Range Organics
Project Name: DERR Blanding Chevron LUST, Blanding AL06700 CtF WO#: 25C1636
www.ChemtechFord.com
Page 4 of 13Page 4 of 13
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:
AL067004
3/20/25 16:11 @ 3.3 °C
3/28/2025
DERR Blanding Chevron LUST, Blanding
AL067004
Sample ID: MW-10
Lab ID: 25C1636-04Matrix: Water
Flag(s)Units
Analysis
Date/Time
Date Sampled: 3/20/25 9:35
Preparation
Date/Time
Sampled By: John Murphy
Minimum
Reporting
Limit MethodResult
Diesel Range with Silica Gel Cleanup
mg/L 3/25/253/24/251.0 EPA 8015 CNDDiesel Range Organics
MBTEXn
mg/L 3/23/253/23/250.005 EPA 8260D/5030BNDBenzene
mg/L 3/23/253/23/250.012 EPA 8260D/5030BNDEthylbenzene
mg/L 3/23/253/23/250.008 EPA 8260D/5030BNDMethyl-tert-butyl ether (MTBE)
mg/L 3/23/253/23/250.012 EPA 8260D/5030BNDNaphthalene
mg/L 3/23/253/23/250.012 EPA 8260D/5030BNDToluene
mg/L 3/23/253/23/250.038 EPA 8260D/5030BNDXylenes, total
Gasoline Range
mg/L 3/23/253/23/250.125 EPA 8260B/C 5030A/[CALC]NDGasoline Range Organics
Project Name: DERR Blanding Chevron LUST, Blanding AL06700 CtF WO#: 25C1636
www.ChemtechFord.com
Page 5 of 13Page 5 of 13
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:
AL067004
3/20/25 16:11 @ 3.3 °C
3/28/2025
DERR Blanding Chevron LUST, Blanding
AL067004
Sample ID: BMW
Lab ID: 25C1636-05Matrix: Water
Flag(s)Units
Analysis
Date/Time
Date Sampled: 3/20/25 8:15
Preparation
Date/Time
Sampled By: John Murphy
Minimum
Reporting
Limit MethodResult
Diesel Range with Silica Gel Cleanup
mg/L 3/25/253/24/251.0 EPA 8015 CNDDiesel Range Organics
MBTEXn
mg/L 3/23/253/23/250.005 EPA 8260D/5030BNDBenzene
mg/L 3/23/253/23/250.012 EPA 8260D/5030BNDEthylbenzene
mg/L 3/23/253/23/250.008 EPA 8260D/5030BNDMethyl-tert-butyl ether (MTBE)
mg/L 3/23/253/23/250.012 EPA 8260D/5030BNDNaphthalene
mg/L 3/23/253/23/250.012 EPA 8260D/5030BNDToluene
mg/L 3/23/253/23/250.038 EPA 8260D/5030BNDXylenes, total
Gasoline Range
mg/L 3/23/253/23/250.125 EPA 8260B/C 5030A/[CALC]NDGasoline Range Organics
Project Name: DERR Blanding Chevron LUST, Blanding AL06700 CtF WO#: 25C1636
www.ChemtechFord.com
Page 6 of 13Page 6 of 13
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:
AL067004
3/20/25 16:11 @ 3.3 °C
3/28/2025
DERR Blanding Chevron LUST, Blanding
AL067004
Sample ID: MW-3B
Lab ID: 25C1636-06Matrix: Water
Flag(s)Units
Analysis
Date/Time
Date Sampled: 3/20/25 10:20
Preparation
Date/Time
Sampled By: John Murphy
Minimum
Reporting
Limit MethodResult
Diesel Range with Silica Gel Cleanup
mg/L 3/25/253/24/251.0 EPA 8015 C40.1Diesel Range Organics
MBTEXn
mg/L 3/23/253/23/250.100 EPA 8260D/5030B1.32Benzene
mg/L 3/23/253/23/250.250 EPA 8260D/5030B1.66Ethylbenzene
mg/L 3/23/253/23/250.008 EPA 8260D/5030BNDMethyl-tert-butyl ether (MTBE)
mg/L 3/23/253/23/250.012 EPA 8260D/5030B1.21Naphthalene
mg/L 3/23/253/23/250.250 EPA 8260D/5030B2.38Toluene
mg/L 3/23/253/23/250.750 EPA 8260D/5030B6.41Xylenes, total
Gasoline Range
mg/L 3/23/253/23/250.750 EPA 8260B/C 5030A/[CALC]48.3Gasoline Range Organics
Project Name: DERR Blanding Chevron LUST, Blanding AL06700 CtF WO#: 25C1636
www.ChemtechFord.com
Page 7 of 13Page 7 of 13
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:
AL067004
3/20/25 16:11 @ 3.3 °C
3/28/2025
DERR Blanding Chevron LUST, Blanding
AL067004
Sample ID: Trip Blank
Lab ID: 25C1636-07Matrix: Water
Flag(s)Units
Analysis
Date/Time
Date Sampled: 3/19/25 0:00
Preparation
Date/Time
Sampled By: John Murphy
Minimum
Reporting
Limit MethodResult
MBTEXn
mg/L 3/23/253/22/250.005 EPA 8260D/5030BNDBenzene
mg/L 3/23/253/22/250.012 EPA 8260D/5030BNDEthylbenzene
mg/L 3/23/253/22/250.008 EPA 8260D/5030BNDMethyl-tert-butyl ether (MTBE)
mg/L 3/23/253/22/250.012 EPA 8260D/5030BNDNaphthalene
mg/L 3/23/253/22/250.012 EPA 8260D/5030BNDToluene
mg/L 3/23/253/22/250.038 EPA 8260D/5030BNDXylenes, total
Gasoline Range
mg/L 3/23/253/22/250.250 EPA 8260B/C /5030A/[CALC]NDGasoline Range Organics
Project Name: DERR Blanding Chevron LUST, Blanding AL06700 CtF WO#: 25C1636
www.ChemtechFord.com
Page 8 of 13Page 8 of 13
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:
AL067004
3/20/25 16:11 @ 3.3 °C
3/28/2025
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.
Flag Descriptions
ISTD-01 = Re-analysis confirms failing internal standard due to matrix interference.
S-04 = The surrogate recovery for this sample is outside of established control limits due to a sample matrix effect .
Project Name: DERR Blanding Chevron LUST, Blanding AL06700 CtF WO#: 25C1636
www.ChemtechFord.com
Page 9 of 13Page 9 of 13
Page 10 of 13
QC Report for Work Order (WO) - 25C1636
% Rec RPD RPD Max MRL DFResultSpk ValueLimitsSource ConcAnalyte
Blank - EPA 8015 C
QC Sample ID: BZC1098-BLK1 Batch: BZC1098
Date Prepared: 03/24/2025 Date Analyzed: 03/25/2025
Diesel Range Organics ND 1.0 1.00
LCS - EPA 8015 C
QC Sample ID: BZC1098-BS1 Batch: BZC1098
Date Prepared: 03/24/2025 Date Analyzed: 03/25/2025
Diesel Range Organics 102 50 - 150 45 44.4 1.0 1.00
Matrix Spike - EPA 8015 C
QC Sample ID: BZC1098-MS1 QC Source Sample: XXXXXXX-XXBatch: BZC1098
Date Prepared: 03/24/2025 Date Analyzed: 03/25/2025
Diesel Range Organics 95.3 50 - 150 44 1 44.4 1.0 1.00
Matrix Spike Dup - EPA 8015 C
QC Sample ID: BZC1098-MSD1 QC Source Sample: XXXXXXX-XXBatch: BZC1098
Date Prepared: 03/24/2025 Date Analyzed: 03/25/2025
Diesel Range Organics 101 5.68 50 - 150 20 46 1 44.4 1.0 1.00
CtF WO#: 25C1636
www.ChemtechFord.com Page 11 of 13
QC Report for Work Order (WO) - 25C1636
% Rec RPD RPD Max MRL DFResultSpk ValueLimitsSource ConcAnalyte
Blank - EPA 8260D
QC Sample ID: BZC1034-BLK1 Batch: BZC1034
Date Prepared: 03/22/2025 Date Analyzed: 03/22/2025
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
QC Sample ID: BZC1035-BLK1 Batch: BZC1035
Date Prepared: 03/22/2025 Date Analyzed: 03/22/2025
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: BZC1034-BS1 Batch: BZC1034
Date Prepared: 03/22/2025 Date Analyzed: 03/22/2025
Benzene 91.8 70 - 130 0.009 0.0100 0.0004 1.00
Ethylbenzene 99.4 70 - 130 0.010 0.0100 0.001 1.00
Methyl-tert-butyl ether (MTBE)99.4 70 - 130 0.010 0.0100 0.0006 1.00
Naphthalene 94.5 70 - 130 0.009 0.0100 0.001 1.00
Toluene 93.3 70 - 130 0.009 0.0100 0.001 1.00
Xylenes, total 97.7 70 - 130 0.029 0.0300 0.003 1.00
QC Sample ID: BZC1035-BS1 Batch: BZC1035
Date Prepared: 03/22/2025 Date Analyzed: 03/22/2025
Benzene 98.1 70 - 130 0.010 0.0100 0.0004 1.00
Ethylbenzene 99.0 70 - 130 0.010 0.0100 0.001 1.00
Methyl-tert-butyl ether (MTBE)82.4 70 - 130 0.008 0.0100 0.0006 1.00
Naphthalene 105 70 - 130 0.010 0.0100 0.001 1.00
Toluene 95.9 70 - 130 0.010 0.0100 0.001 1.00
Xylenes, total 98.9 70 - 130 0.030 0.0300 0.003 1.00
Matrix Spike - EPA 8260D
QC Sample ID: BZC1034-MS1 QC Source Sample: XXXXXXX-XXBatch: BZC1034
Date Prepared: 03/22/2025 Date Analyzed: 03/22/2025
Benzene 77.8 70 - 130 0.039 ND 0.0500 0.002 1.00
Ethylbenzene 81.0 70 - 130 0.040 ND 0.0500 0.005 1.00
Methyl-tert-butyl ether (MTBE)106 70 - 130 0.053 ND 0.0500 0.003 1.00
Naphthalene 97.2 70 - 130 0.049 ND 0.0500 0.005 1.00
Toluene 35.8 70 - 130 0.039 0.021 0.0500 0.005 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.
Xylenes, total 62.4 70 - 130 0.122 0.029 0.150 0.015 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.
QC Sample ID: BZC1035-MS1 QC Source Sample: XXXXXXX-XXBatch: BZC1035
Date Prepared: 03/22/2025 Date Analyzed: 03/22/2025
Benzene -671 70 - 130 0.536 1.38 0.125 0.005 1.00
CtF WO#: 25C1636
www.ChemtechFord.com Page 12 of 13
QC Report for Work Order (WO) - 25C1636
% Rec RPD RPD Max MRL DFResultSpk ValueLimitsSource ConcAnalyte
Matrix Spike - EPA 8260D (cont.)
QC Sample ID: BZC1035-MS1 QC Source Sample: XXXXXXX-XXBatch: BZC1035
Date Prepared: 03/22/2025 Date Analyzed: 03/22/2025
E - The concentration indicated for this analyte is an estimated value above the calibration range of the instrument. This value is
considered an estimate (CLP E-flag).
Ethylbenzene 92.1 70 - 130 0.185 0.070 0.125 0.012 1.00
Methyl-tert-butyl ether (MTBE)23.1 70 - 130 0.029 ND 0.125 0.008 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 107 70 - 130 0.134 ND 0.125 0.012 1.00
Toluene -2370 70 - 130 1.16 4.12 0.125 0.012 1.00
E - The concentration indicated for this analyte is an estimated value above the calibration range of the instrument. This value is
considered an estimate (CLP E-flag).
Xylenes, total 87.7 70 - 130 0.659 0.330 0.375 0.038 1.00
Matrix Spike Dup - EPA 8260D
QC Sample ID: BZC1034-MSD1 QC Source Sample: XXXXXXX-XXBatch: BZC1034
Date Prepared: 03/22/2025 Date Analyzed: 03/22/2025
Benzene 78.4 0.768 70 - 130 20 0.039 ND 0.0500 0.002 1.00
Ethylbenzene 81.4 0.493 70 - 130 25 0.041 ND 0.0500 0.005 1.00
Methyl-tert-butyl ether (MTBE)111 4.15 70 - 130 20 0.055 ND 0.0500 0.003 1.00
Naphthalene 99.1 1.94 70 - 130 25 0.050 ND 0.0500 0.005 1.00
Toluene 36.6 1.02 70 - 130 20 0.039 0.021 0.0500 0.005 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.
Xylenes, total 63.0 0.733 70 - 130 20 0.123 0.029 0.150 0.015 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.
QC Sample ID: BZC1035-MSD1 QC Source Sample: XXXXXXX-XXBatch: BZC1035
Date Prepared: 03/22/2025 Date Analyzed: 03/22/2025
Benzene -669 0.512 70 - 130 20 0.539 1.38 0.125 0.005 1.00
E - The concentration indicated for this analyte is an estimated value above the calibration range of the instrument. This value is
considered an estimate (CLP E-flag).
Ethylbenzene 93.9 1.21 70 - 130 25 0.187 0.070 0.125 0.012 1.00
Methyl-tert-butyl ether (MTBE)23.9 3.40 70 - 130 20 0.030 ND 0.125 0.008 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 112 4.38 70 - 130 25 0.140 ND 0.125 0.012 1.00
Toluene -2320 5.48 70 - 130 20 1.22 4.12 0.125 0.012 1.00
E - The concentration indicated for this analyte is an estimated value above the calibration range of the instrument. This value is
considered an estimate (CLP E-flag).
Xylenes, total 87.1 0.323 70 - 130 20 0.657 0.330 0.375 0.038 1.00
CtF WO#: 25C1636
www.ChemtechFord.com Page 13 of 13