DERR-2024-011873

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

October 4, 2024

Mr. Darrell Vincent
Pyramid Oil Co.
4996 South 950 East
Ogden, Utah 84403

Re: Results of Soil Vapor Sampling
Former Calvinco Co. (Intermountain Lock)
3106 South Main Street, South Salt Lake, Utah
Facility ID #4000124, Release Site OBL

Dear Mr. Vincent:

Two soil vapor sampling points were installed at IML Security Supply on September 13, 2024. Vapor pins®
were emplaced through the concrete slab near existing monitoring wells MW-5 and MW-7 (Figure 1) by RMEC
Environmental, Inc. Certified Soil and Groundwater Sampler and Geologist Danny Burt (GS-1884, Expiration
date 2/16/2025) performed the sampling using industry standard protocols. Leak testing of each temporary
installation was done using water dams. Vapor samples were collected from the subsurface using 1 liter summa
cans equipped with lab supplied flow regulators and Teflon tubing trains. The samples were collected below an
8-10” concrete slab in locations shown in Figure 1. Air purging was performed to remove 4 dead volumes from
tubing or sample train utilizing a 50 ml syringe at a rate of 200 cc per minute. An equilibrium time of
approximately 1 hour was allowed prior to sampling. Beginning and ending summa can vacuums were recorded
during sampling. The vapor samples were analyzed using EPA method TO-15 for MTBE, BTEXN, and TPH
by ALS laboratory. Following vapor sample collection, the vapor pins® were removed and the drill holes patched
using hydraulic cement.

The analytical results of vapor sampling, presented on Table 1, are reported in micrograms-per-cubic meter
(µg/m3). The results are compared with June 2015 Utah DERR RBCA commercial, sub-slab, guidance. Sample
SV-01-West was collected near MW-5 and sample SV-02-East was collected near MW-7. Each vapor sample
contained low BTEX and TPH concentrations below the regulatory guidance referenced.

The laboratory analytical report is attached. If you have any questions or comments, please feel free to
contact me.

Respectfully,
Underwood Environmental Consulting, Inc.
L. Earl Underwood, P.G.
Sr. Geologist, CC-0018

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

Attachments: As stated

cc: Mr. Mark Crim, DERR
Mr. Neal Hickenlooper, IML Security Supply
LEGEND
approx. scale in feet
one inch ~ 30 feet
00 3015
Former Calvinco Co.
(Intermountain Lock)
3106 South Main St.
South Salt Lake, Utah
Facility ID # 4000124
Release Site OBL
NORTH
W
SD
Natural Gas
Water Line
G
W
S
(Utility Locations Approximate)
Power or Unknown
SD Storm Drain
CommunicationsC
P
Sanitary Sewer
U
GG
C
S
U
P
SD
SD
C
W
C C
U
S
S
SD
P
U
U
Ma
i
n

S
t
r
e
e
t
Angelo Avenue
Intermountain Lock Security Supply
Closed-in-Place
Diesel UST
Gr
a
c
e

M
a
r
y

M
a
n
o
r
FIGURE 110/04/2024
MW-2
Monitoring Well
B-1
Soil Boring
Soil Boring (Western Geologic, 2021b)
GP-01
91.17 Groundwater Elev. (ft)
9
1
Groundwater Contour Line
(contour interval = 0.1 ft)
Groundwater
Flow Direction
Soil Vapor Sample Locations
September 13, 2024
B-2
B-1
GP-01
GP-02GP-03
GP-04
GP-05
MW-3 MW-1
MW-2
MW-4 MW-6
MW-5
MW-7
V
V
V
Soil Vapor Sample Point
SV-01-West
SV-02-East
Soil Vapor Sampling Report - September 2024
IML - Former Calvinco Co.
Facility ID #4000124, Release Site OBL
Well /Sample Sample MTBE Benzene Toluene Ethyl-Total Naphthalene TPH
Sample Date Depth benzene Xylenes
Name (ft bgs)(µg/m3)(µg/m3)(µg/m3)(µg/m3)(µg/m3)(µg/m3)(µg/m3)
SV-01-West 9/13/2024 ~0.75 <0.59 3.2 6.6 2.0 14.4 <1.7 110
SV-02-East 9/13/2024 ~0.75 <0.70 3.3 5.6 1.7 12.3 <2.0 97
DERR SSCL Calculator, sub-slab,
commercial 146000 16.4 243667 49333 4933 146 NE
Notes:MTBE = methyl tertiary butyl ether TPH = total petroleum hydrocarbons
ft bgs = feet below ground surface < = below given detection limit.
µg/m 3 = micrograms-per-cubic meter NE = not established
Bold values, if any, indicate a concentration greater than DERR SSCL Calculator, sub-slab, commercial regulatory guidance (DERR, 2015).
TABLE 1
SOIL VAPOR ANALYTICAL RESULTS
Underwood Environmental Consulting, Inc.
ANALYTICAL REPORT
Earl Underwood
Underwood Environmental
9475 No. Silver Creek Rd
Park City, UT 84098
Phone:
E-mail:
[phone]
earl@underwoodenvironmental.c
om
Report Date:September 19, 2024
34-2425750Workorder:
IML Security
OBL - 0924Purchase Order:
Project ID:
Project Manager Lisa M. Reid
Sampling SiteReceive DateCollect DateLab IDClient Sample ID
2425750001 09/13/24SV-01-WEST 09/13/24 IML Security
2425750002 09/13/24SV-02-EAST 09/13/24 IML Security
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ADDRESS 960 West LeVoy Drive, Salt Lake City, Utah, 84123 USA PHONE FAX[phone] [phone]
ALS GROUP USA, CORP.An ALS Limited Company
||WEB|http://www.alsglobal.com/slt
ANALYTICAL REPORT
Project Manager:Lisa M. Reid
Client:Underwood Environmental
Workorder:34-2425750
Analytical Results
Sample ID:09/13/2024
09/13/20242425750001Lab ID:
Collected:
Received:
SV-01-WEST IML Security
Sampling Parameter:NAMatrix:
Media:
Air
1 Liter Summa Canister
Sampling Site:
Analysis:EPA TO-15, Air
Analyzed:09/18/2024 14:17
Batch:
Instrument ID:
IVOA/6613 (HBN: 321073)
5975-LPreparation:Not Applicable
Result (ppb)Analyte
Result
(ug/m³)MDL (ppb)QualRL (ppb)Dilution
Analysis Method - EPA TO-15 by IH-AN-014
0.55<0.59ND 0.17 UMethyl t-butyl ether 1.1
0.553.21.0 0.17Benzene 1.1
0.556.61.8 0.17Toluene 1.1
0.552.00.47 0.17 JEthyl benzene 1.1
1.1102.3 0.33m,p-Xylene 1.1
0.554.41.0 0.17o-Xylene 1.1
2.2<1.7ND 0.33 UJNaphthalene1.1
NA11032NA JTotal Petroleum Hydrocarbons 1.1
Sample ID:09/13/2024
09/13/20242425750002Lab ID:
Collected:
Received:
SV-02-EAST IML Security
Sampling Parameter:NAMatrix:
Media:
Air
1 Liter Summa Canister
Sampling Site:
Analysis:EPA TO-15, Air
Analyzed:09/18/2024 15:07
Batch:
Instrument ID:
IVOA/6613 (HBN: 321073)
5975-LPreparation:Not Applicable
Result (ppb)Analyte
Result
(ug/m³)MDL (ppb)QualRL (ppb)Dilution
Analysis Method - EPA TO-15 by IH-AN-014
0.65<0.70ND 0.20 UMethyl t-butyl ether 1.3
0.653.31.0 0.20Benzene 1.3
0.655.61.5 0.20Toluene 1.3
0.651.70.38 0.20 JEthyl benzene 1.3
1.38.11.9 0.39m,p-Xylene 1.3
0.654.20.97 0.20o-Xylene 1.3
2.6<2.0ND 0.39 UJNaphthalene1.3
NA9728NA JTotal Petroleum Hydrocarbons 1.3
Comments
Quality Control:EPA TO-15 by IH-AN-014 - (Batch: 321073)
“Total Petroleum Hydrocarbons” is the sum of all peaks in the chromatogram with a 41 ion with the addition of the BTEX
compounds and was quantitated against the 117 ion of the Internal Standard.
Each sample in this work order had a reduced volume in the sample canister and therefore a small dilution was applied to the
final result.
Page 2 of 4 Thu, 09/19/24 1:40 PM ENVREP-V4.8
ANALYTICAL REPORT
Project Manager:Lisa M. Reid
Client:Underwood Environmental
Workorder:34-2425750
Report Authorization
Analyst Peer ReviewMethod
(/S/ is an electronic signature that complies with 21 CFR Part 11)
EPA TO-15 by IH-AN-014 (321073)/S/ Paul Kelly
09/19/2024 11:00 09/19/2024 13:30
/S/ Thomas J. Masoian
Laboratory Contact Information
[phone]
[e-mail]
www.alsglobal.com/slt
ALS Environmental
960 W Levoy Drive
Salt Lake City, Utah 84123
Phone:
Email:
Web:
General Lab Comments
The results provided in this report relate only to the items tested.
Samples were received in acceptable condition unless otherwise noted.
The following was provided by the client: Sample ID, Collection Date, Sampling Location, Media Type, Sampling Parameter.
Collection Date, Media Type, and Sampling Parameter can potentially affect the validity of the results.
Samples have not been blank corrected unless otherwise noted.
This test report shall not be reproduced, except in full, without written approval of ALS.
ALS provides professional analytical services for all samples submitted. ALS is not in a position to interpret the data and
assumes no responsibility for the quality of the samples submitted.
All quality control samples processed with the samples in this report yielded acceptable results unless otherwise noted.
ALS is accredited for specific fields of testing (scopes) in the following testing sectors. The quality system implemented at ALS
conforms to accreditation requirements and is applied to all analytical testing performed by ALS. The following table lists testing
sector, accreditation body, accreditation number and website. Please contact these accrediting bodies or your ALS project
manager for the current scope of accreditation that applies to your analytical testing.
Testing Sector
Accreditation Body
(Standard)
Certificate
Number Website
Industrial Hygiene AIHA (ISO 17025 &
AIHA IHLAP)
101574 http://www.aihaaccreditedlabs.org
DOECAP-AP L22-62 http://www.pjlabs.com
Washington C596 https://ecology.wa.gov/Regulations-Permits/Permits-certifications/Lab
oratory-Accreditation
Dietary Supplements PJLA (ISO 17025) L22-61 http://www.pjlabs.com
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ANALYTICAL REPORT
Project Manager:Lisa M. Reid
Client:Underwood Environmental
Workorder:34-2425750
MDL = Method Detection Limit, a statistical estimate of method/media/instrument sensitivity.
RL = Reporting Limit, a verified value of method/media/instrument sensitivity.
CRDL = Contract Required Detection Limit
Reg. Limit = Regulatory Limit.
ND = Not Detected, testing result not detected above the MDL or RL.
< Means this testing result is less than the numerical value.
** No result could be reported, see sample comments for details.
U = Qualifier indicates that the analyte was not detected above the MDL.
J = Qualifier Indicates that the analyte value is between the MDL and the RL. It is also used to indicate an estimated value for
B = Qualifier indicates that the analyte was detected in the blank.
E = Qualifier indicates that the analyte result exceeds calibration range.
P = Qualifier indicates that the RPD between the two columns is greater than 40%.
Result Symbol Definitions
Qualifier Symbol Definitions
tentatively identified compounds in mass spectrometry where a 1:1 response is assumed.
Q = Qualifier indicates that the analyte was outside the limits in a lab QC sample.
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