DAQ-2024-012123

DAQE-GN162360001-24
{{$d1 }}

David Hansen
Rockwell Solutions, Inc.
718 Bridger Lane
Elk Ridge, UT 84651

Dear Mr. Hansen:

RE: Notice of Intent for Installation of a New Soil Vapor Extraction System at Lake Powell Offshore
Marina
Project Number: N162360001

We have reviewed Rockwell Solution, Inc.’s Notice of Intent submitted October 11, 2024, regarding the
installation of a new soil vapor extraction (SVE) system to remediate the impacted soils from Lake
Powell Offshore Marina located at Highway 276, Mile Marker 30, Lake Powell in Garfield County, UT.
This operation shall be done in a way to ensure that the actual emissions of volatile organic compounds
(VOCs) do not exceed 5 tons/year, in accordance with R307-401-9 of the Utah Administrative Code
(UAC). Also, the level of any individual hazardous air pollutant (HAP) shall not exceed the emission
threshold values listed in R307-410-5(1)(c)(i)(C).

Emissions estimates of VOC shall be based on test data obtained in accordance with EPA document
SW-846, test 8260c or 8261A, or the most recent revision of either method. Emissions estimates of HAPs
shall be based on test data obtained in accordance with EPA document SW-846, test 8021B, or the most
recent revision of that method. Other test methods may be approved by the Director. Initial test samples
shall be drawn on system startup. Additional test samples shall be drawn at intervals of no less than
twenty-eight days and no more than thirty-one days (i.e., monthly) for the first quarter, quarterly for the
remainder of the first year, and semi-annually thereafter or as determined necessary by the Director.
Results of the testing and calculated annual quantity of emissions of VOCs and HAPs shall be submitted
to the Division of Air Quality, attention Minor Source Compliance section, within 30 days of sampling.

At the anticipated level of air emissions, this project will not require an approval order, but the project
will have to meet the requirements as stated in the R307-401-15 UAC. Should the actual emissions of
VOCs or HAPs approach the thresholds of R307-401-9(1)(a) or R307-410-5(1)(d), the SVE system shall
be shut down for the remainder of the year or until an approval order can be obtained from the Division of
Air Quality. Also, please note that this letter in no way releases the owner or operator of the site from any
liability for compliance with all other applicable federal, state, county, and city regulations.

195 North 1950 West • Salt Lake City, UT
Mailing Address: P.O. Box 144820 • Salt Lake City, UT 84114-4820
Telephone [phone] • Fax [phone] • T.D.D. [phone]
www.deq.utah.gov
Printed on 100% recycled paper
State of Utah

SPENCER J. COX
Governor
DEIDRE HENDERSON
Lieutenant Governor

Department of
Environmental Quality

Kimberly D. Shelley
Executive Director

DIVISION OF AIR QUALITY
Bryce C. Bird
Director

" " * " / Ú Ú Û Ù Û Ý
DAQE-GN162360001-24
Page 2
The fee for issuing this letter is the cost, as authorized by the legislature, of the actual time spent by the
review engineer and all other staff on the project. Payment should be sent to the Division of Air Quality
upon receipt of the invoice.

Thank you for informing the Division of Air Quality of this project. If you have any additional questions,
please contact Katie Andersen, who may be reached at [phone] or [e-mail].

Sincerely,

Bryce C. Bird
Director

{{$s }}

Alan D. Humpherys, Manager
New Source Review Section

BCB:ADH:KA:jg

{{#d1=date1_es_:signer1:date:format(date, "mmmm d, yyyy")}} {{#s=Sig_es_:signer1:signature}}
Katie Andersen <[e-mail]>
Calculation Check for Soil Vapor Extraction Project
5 messages
Katie Andersen <[e-mail]>Thu, Nov 14, 2024 at 12:59 PM
To: Tim Dejulis <[e-mail]>
Hey Tim,
I'm working on a soil vapor extraction project for site 16236. They are installing one vacuum blower with an air flow rate of
73 ft^3/min to five soil vapor extraction wells to remediate some soil under buildings.
Because the soil is under the buildings, they can't excavate the soil to land farm it. Since they are not land farming the
contaminated soil, I can't use the spreadsheet that you've provided to me to determine the emissions.
I've figured out how to calculate the emissions given the air flow rate of the vacuum blower, density of each contaminant,
and the average concentrations in the soil.
Would you mind taking a look at my calculations? I've compared the lb/hr rates with the thresholds in the TVL document. I
think the lb/hr emission rates are under the thresholds, but I'm confused about the threshold for TPH. I'm not sure if it is a
flat 10,000 pounds for the entire duration of the project, or if it is an hourly rate.
Another concern I have is that the tons per year of TPH and Xylenes are over the 5 tons per year threshold as well. I'm
not sure if I should even be using the 5 tons per year threshold, but I figured I would check it and now I'm not sure what to
do.
Any advice would be greatly appreciated!
Cheers,
Katie
Notice of Intent for SVE, Ticaboo.xlsx
20K
Katie Andersen <[e-mail]>Thu, Nov 14, 2024 at 1:05 PM
To: Tim Dejulis <[e-mail]>
Tim,
Also, I'm not sure if this helps, but the source provided an estimate for their annual emissions based on other similar
projects. Because of the format he sent it, I wasn't confident in his estimate because I couldn't find a way to justify it.
But I've attached the project folder: Google File
Cheers,
Katie
[Quoted text hidden]
Tim Dejulis <[e-mail]>Mon, Nov 18, 2024 at 12:33 PM
To: Katie Andersen <[e-mail]>
Hi Katie.
I've had a situation like this, where the source is using a vapor blower to remediate the soil because they can't take the
soil out of the ground and use a landform process. Is this a blower or a combustion extractor? If it's a blower, we need
them to have the concentrations coming at the exit to the blower,if the stack height is less than 25" in height. These are
available to the consultant (even though I anticipate they might protest). Use these values to estimate the emissions. I
11/21/24, 5:33 PM State of Utah Mail - Calculation Check for Soil Vapor Extraction Project
https://mail.google.com/mail/u/0/?ik=0900585596&view=pt&search=all&permthid=thread-a:r-7248281984706969992&simpl=msg-a:r23429032463913…1/3
would speculate the emissions are below our TLV thresholds in each pollutant case, even if it is 10' or so. If it is a
combustion extractor, the emissions are basically zero due to combustion and we can grant a SVE in accordance. I
appreciate you doing this evaluation through the air blower/combustor. Here's what we are doing with the SVE.
The SVE emissions are based on the initial soil concentrations. We are going off the most recent emissions estimates of
the HAPs. The MTBE isn't included in our estimates, since it has been removed from the list of HAPs, as you know. In the
blower case, the initial emission limitations are used to represent what goes into each blower, in this case one blower
stack. So, all the combined emissions from all 13 sources will be emitted by the one stack. Now if Ticaboo has a stack
height that is high enough, like 25', we're done. The emissions will be below the thresholds for each pollutant.
If you have any questions, I'm here. I like how you're taking this seriously Katie.
Timothy DeJulis, PE
Environmental Engineer | Minor NSR Section
P: [phone]
airquality.utah.gov
[Quoted text hidden]
Katie Andersen <[e-mail]>Thu, Nov 21, 2024 at 4:00 PM
To: Tim Dejulis <[e-mail]>
Hi Tim,
I asked the source about their stack height; which will be 12-15 feet.
Does it make a difference that the emissions are being routed through an activated carbon drums to remove the
hydrocarbon vapors. Looking into the activated carbon drums, they seem to have efficiencies in the 90% area. If I assume
that the max sample concentration of each type is routed through the drum with removes 90% of the pollutants, then all of
the emissions are below the thresholds and we are golden.
Is that a way I can justify issuing the permit?
I keep hearing from people that sources like this are typically always good. I just want to make sure I'm doing this right
and can justify it.
I appreciate your help!
Katie
[Quoted text hidden]
Tim Dejulis <[e-mail]>Thu, Nov 21, 2024 at 5:31 PM
To: Katie Andersen <[e-mail]>
That's an even better outcome. If they have activated carbon the gasses are passing through before they are released to
the atmosphere, I would go ahead and process this. Put everything into the file folder, like the activated carbon filtration
unit for example, and go ahead and issue the SVE letter. Now we process SVE's a little differently than landforms. SVE's
have documentation submitted to compliance and the location in Ticaboo will follow-up with them. It goes from monthly
reports for the first year, then if successful quarterly for the next year, then if successful semi-annually. I think the Ticaboo
source will be completely remediated in the first year.
Nice work following up on this so diligently!
11/21/24, 5:33 PM State of Utah Mail - Calculation Check for Soil Vapor Extraction Project
https://mail.google.com/mail/u/0/?ik=0900585596&view=pt&search=all&permthid=thread-a:r-7248281984706969992&simpl=msg-a:r23429032463913…2/3
Timothy DeJulis, PE
Environmental Engineer | Minor NSR Section
P: [phone]
airquality.utah.gov
[Quoted text hidden]
11/21/24, 5:33 PM State of Utah Mail - Calculation Check for Soil Vapor Extraction Project
https://mail.google.com/mail/u/0/?ik=0900585596&view=pt&search=all&permthid=thread-a:r-7248281984706969992&simpl=msg-a:r23429032463913…3/3
Katie Andersen <[e-mail]>
Offshore Marina, addl info
1 message
David Hansen <[e-mail]>Tue, Nov 19, 2024 at 8:49 AM
To: Katie Andersen <[e-mail]>
Katie,
Here is the website for the carbon drums. I order the G-3S. Hopefully, you can find what you need
here.
https://www.carbtrol.com/activated-carbon-drum-filters/
If the carbon becomes saturated and is no longer removing hydrocarbons, we'll see it in the lab
data and will replace it.
The stack will extend to a height of 12-15 feet, above the top of the generator building.
Thanks,
Dave
11/21/24, 5:34 PM State of Utah Mail - Offshore Marina, addl info
https://mail.google.com/mail/u/0/?ik=0900585596&view=pt&search=all&permthid=thread-f:1816169396153469458&simpl=msg-f:1816169396153469458 1/1
Sample Date
MTBE
(mg/kg)
Benzene
(mg/kg)
Toluene
(mg/kg)
Ethyl-
benzene
(mg/kg)
Xylenes
(mg/kg)
Naph-
thalene
(mg/kg)
TPH-
DRO
(mg/kg)
0.2 0.2 9 5 142 51 500 Initial Scree
TP-7@3 9/23/2020 <0.00124 <0.00124 <0.00621 <0.00310 <0.00807 <0.0155 <4.43
TP-7@6 9/23/2020 <0.00119 <0.00119 <0.00597 <0.00298 <0.00776 <0.0149 <4.36
TP-8@4'9/23/2020 0.0413 <0.00884 1.51 1.83 9.45 2.88 9,040
TP-8@7'9/23/2020 <0.00123 <0.00123 0.00778 0.00995 0.0683 0.121 489
TP8@10'9/23/2020 <0.00141 <0.00141 <0.00706 <0.00353 0.00978 <0.0176 8
SS-1-B-E 9/23/2020 0.069 <0.0242 2.17 2.19 11.1 3.57 9,330
SS-2-B-C 9/23/2020 0.274 <0.0897 9.8 9.78 46.8 9.13 20,000
SS-3-B-W 9/23/2020 <0.115 <0.115 0.595 5.33 36.6 13.8 26,500
SS-4-SWE 9/23/2020 0.0653 <0.0594 2.22 2.48 10.5 6.26 7,170
SS-5-NEW 9/23/2020 0.119 <0.0426 3.49 3.68 20 7.59 17,200
SS-6-SWW 9/23/2020 0.486 <0.0595 17.4 16.5 84.4 16.4 29,200
SS-7-NWW 9/23/2020 0.00189 <0.305 0.0721 0.164 0.803 0.305 20,600
SS-8-WW 9/23/2020 0.136 <0.0579 4.66 5.78 31.7 11 11,900
SW, 1.5'3/23/2021 NA <0.01 <0.03 <0.03 <0.03 <0.03 159
SW, 2.5'3/23/2021 NA <0.01 <0.03 <0.03 <0.03 <0.03 <54
SW, 4'3/23/2021 NA <0.01 <0.03 <0.03 <0.03 <0.03 <64
SW, 6.5'3/23/2021 NA <0.01 <0.03 <0.03 <0.03 <0.03 <59
NW, 5'3/23/2021 NA <0.01 <0.03 <0.03 <0.03 <0.03 <59
NW, 6.5'3/23/2021 NA <0.01 <0.03 <0.03 <0.03 <0.03 <54
Table 1
Soil Sample Results in Proposed Remediation Area Offshore Marina
Highway 276, Mile Marker 30, Lake Powell, Utah
Initial Screening Levels
Excavation conducted March 22-25, 2021
N1, 1.5'3/24/2021 NA <0.01 <0.02 <0.02 <0.02 <0.02 113
N1, 2.5'3/24/2021 NA <0.01 <0.03 <0.03 <0.03 <0.03 <54
N1, 4'3/24/2021 NA <0.01 <0.03 <0.03 <0.03 <0.03 <55
B-1, 6.5'3/25/2021 NA <0.01 <0.03 <0.03 <0.03 <0.03 <53
Based on Max Co
efficiency:90%
stack height:15 ft
MBTEXN analyzed by EPA Method 8260
TPH-DRO = Total Petroleum Hydrocarbons-Diesel Range Organics, analyzed by EPA Method 8015
MTBE
(mg/kg)
Benzene
(mg/kg)
Toluene
(mg/kg)
Ethyl-
benzene
(mg/kg)
Xylenes
(mg/kg)
Naph-
thalene
(mg/kg)
TPH-
DRO
(mg/kg)
ening Levels 0.2 0.2 9 5 142 51 500
0 0 0 0 0 0 0
0 0 0 0 0 0 0
0.0413 0 1.51 1.83 9.45 2.88 9,040
0 0 0.00778 0.00995 0.0683 0.121 489
0 0 0 0 0.00978 0 8
0.069 0 2.17 2.19 11.1 3.57 9,330
0.274 0 9.8 9.78 46.8 9.13 20,000
0 0 0.595 5.33 36.6 13.8 26,500
0.0653 0 2.22 2.48 10.5 6.26 7,170
0.119 0 3.49 3.68 20 7.59 17,200
0.486 0 17.4 16.5 84.4 16.4 29,200
0.00189 0 0.0721 0.164 0.803 0.305 20,600
0.136 0 4.66 5.78 31.7 11 11,900
NA 0 0 0 0 0 159
NA 0 0 0 0 0 0
NA 0 0 0 0 0 0
NA 0 0 0 0 0 0
NA 0 0 0 0 0 0
NA 0 0 0 0 0 0 Air Flow Rate:73 ft^3/min
NA 0 0 0 0 0 113 2.06711 m^3/min
NA 0 0 0 0 0 0
NA 0 0 0 0 0 0
NA 0 0 0 0 0 0
Averages 0.09173 0 1.82282087 2.075823913 10.9317861 3.0893913 6596.0435 mg/kg
Densities 740 876 867 866 870 1145 845 kg/m^3
67.8802 0 1580.38569 1797.663509 9510.6539 3537.35304 5573656.7 mg/m^3
140.3158601 0 3266.83153 3715.968742 19659.5706 7312.09889 11521363 mg/min
0.000309338 0 0.00720201 0.008192171 0.0433412 0.01612015 25.399831 lb/min
0.018560299 0 0.43212057 0.491530257 2.6004723 0.96720885 1523.9898 lb/hr
Thresholds 9.196 3.843 4.429 22.144 2.674 10,000 lb/hr According to the TVL Document: https://dr
162.5882189 0 3785.37622 4305.805051 22780.1373 8472.7495 13350151 lb/year
0.081294109 0 1.89268811 2.152902525 11.3900687 4.23637475 6675.0755 tpy
oncentrations 0.5 0.2 17 17 142 51 29200 mg/kg
359.64 175.2 15085.8 14289 123540 58395 24674000 mg/m^3
743.4155458 362.1577233 31184.0125 29536.93898 255370.806 120708.906 51003879 mg/min
0.001638923 0.000798408 0.06874782 0.065116709 0.56298678 0.26611311 112.44241 lb/min
0.098 0.048 4.125 3.907 33.779 15.967 6746.545 lb/hr
0.009833539 0.004790446 0.41248694 0.390700251 3.37792071 1.59667865 674.65449 lb/hr, after treatment in activated carbon
rive.google.com/file/d/1lG067EcwfwDOdsuOxSAhB_HOTEKu-tBw/view
140 lbs high activity carbon
MM 106.16 lb/mol xylene
12 lb/mol of carbon
96 lb/mol of carbon in xylene
1.105833333 lb xylene/lb carbon
154.8166667 lbs of xylene absorbed in the carbon
Site tph benzene toluene ethylbenzene xylenes naphthalene mtbe
Triple Stop (2022)670 0.63 0.85 0.34 31 56 0.25
La Pico Market (2021)582 1.1 23.3 26 253 2.58 1.12
average 626 0.865 12.075 13.17 142 29.29 0.685
Estimate for Ticaboo 750 1 10 13 125 50 0
Values are in pounds
Ticaboo contamination is diesel
Annual Emissions from SVE Sites using Activated Carbon Drums
Ticaboo estimates for annual hydrocarbon emissions
Katie Andersen <[e-mail]>
notice of intent for soil remediation
7 messages
David Hansen <[e-mail]>Fri, Oct 11, 2024 at 12:54 PM
To: Daniel Riddle <[e-mail]>, Katie Andersen <[e-mail]>, Alan Humpherys <[e-mail]>
Hello all,
We're working on a small remediation project in southern Utah and plan to install a soil vapor
extraction system. Please see attached and let me know if you need additional information.
Thanks,
Dave
Notice of Intent for SVE, Ticaboo.pdf
1291K
Alan Humpherys <[e-mail]>Fri, Oct 11, 2024 at 1:31 PM
To: Katie Andersen <[e-mail]>
Katie,
Can you please process this project?
Site ID: 16236
Peer: Tim
Thanks,
Alan
[Quoted text hidden]
--
Alan Humpherys
Manager | Minor NSR Section
P: [phone]
F: [phone]
airquality.utah.gov
Emails to and from this email address may be considered public records and thus subject to Utah GRAMA
requirements.
Notice of Intent for SVE, Ticaboo.pdf
1291K
Katie Andersen <[e-mail]>Wed, Oct 16, 2024 at 10:10 AM
To: David Hansen <[e-mail]>
Hi Dave,
I've taken a look at this project and I need additional information to process the project. Can you provide annual emission
estimates for each of the pollutants in the soil based on the soil vapor extraction system that will be installed?
11/14/24, 1:02 PM State of Utah Mail - notice of intent for soil remediation
https://mail.google.com/mail/u/0/?ik=0900585596&view=pt&search=all&permthid=thread-f:1812644874308246077&simpl=msg-f:18126448743082460…1/3
Cheers,
Katie Andersen
[Quoted text hidden]
--

Katie Andersen
Engineering Technician I | Minor NSR Section
M: [phone]
airquality.utah.gov
David Hansen <[e-mail]>Wed, Oct 16, 2024 at 2:59 PM
To: Katie Andersen <[e-mail]>
Hi Katie,
Looking at similar soil vapor extraction sites where we treated the effluent air with activated carbon
prior to emissions, I am projecting that the annual emissions will be as follows:
TPH: 750 pounds
benzene: 1 pound
toluene: 10 pounds
ethylbenzene: 13 pounds
xylenes: 125 pounds
naphthalene: 50 pounds
MTBE: 0 pounds
I don't expect to run the system for more than one year.
Thanks,
Dave
[Quoted text hidden]
Katie Andersen <[e-mail]>Thu, Oct 17, 2024 at 9:44 AM
To: David Hansen <[e-mail]>
Dave,
Thank you for these numbers. Do you have calculations or data to support/justify these emission estimates?
Cheers,
Katie
[Quoted text hidden]
David Hansen <[e-mail]>Fri, Oct 18, 2024 at 5:56 AM
To: Katie Andersen <[e-mail]>
11/14/24, 1:02 PM State of Utah Mail - notice of intent for soil remediation
https://mail.google.com/mail/u/0/?ik=0900585596&view=pt&search=all&permthid=thread-f:1812644874308246077&simpl=msg-f:18126448743082460…2/3
Katie,
I worked on two other sites with a similar setup, where we used soil vapor extraction and carbon
drums to treat the vapors. I averaged those annual emissions and made some adjustments
because the contamination is diesel fuel rather than gasoline. See attached. It's pretty simple, but
gives us a ballpark idea.
I think we'll stay well under the annual emission limits, but we can always shut down the system or
add/replace additional carbon drums if we are approaching the limits.
Thanks,
Dave
[Quoted text hidden]
Ticaboo emissions estimates.pdf
266K
Katie Andersen <[e-mail]>Thu, Oct 24, 2024 at 1:12 PM
To: David Hansen <[e-mail]>
Dave,
Would you mind sending me the emission from the other two projects and the spreadsheet where you averaged the
annual emissions?
The spreadsheet calculations and the annual emissions from the other two sites will help me to justify the calculations for
this site.
Cheers,
Katie Andersen
[Quoted text hidden]
11/14/24, 1:02 PM State of Utah Mail - notice of intent for soil remediation
https://mail.google.com/mail/u/0/?ik=0900585596&view=pt&search=all&permthid=thread-f:1812644874308246077&simpl=msg-f:18126448743082460…3/3
Rockwell Solutions, Inc.
718 E Bridger Lane
Elk Ridge, UT 84651
[phone]
October 11, 2024

Mr. Alan Humpherys
Department of Environmental Quality, Division of Air Quality
PO Box 144840
Salt Lake City, Utah 84114-4840

Re: Notice of intent to treat contaminated soil
Offshore Marina Facility: 6001025
Highway 276, Mile Marker 30 Release: NYH
Lake Powell, Utah

Dear Mr. Humpherys:

Rockwell Solutions, Inc, is preparing a Corrective Action Plan for the Division of
Environmental Response and Remediation (DERR) to treat residual soil at the above-
referenced site.

The Offshore Marina provides boat rentals, dry dock storage of boats, and other boat services
on a 150-acre site located approximately ten miles north of Bullfrog Marina at Lake Powell,
Utah. The property is owned by the Utah School and Institutional Trust Lands Administration
(SITLA) and leased by Offshore Marina.

A diesel fuel release occurred in August 2020. Accessible impacted soil was removed in
excavation events immediately after the discovery of the release and in March 2021. Some
contaminated soil below the AST and the generator shed was inaccessible to excavation and
will be remediated by soil vapor extraction (SVE).

Several SVE wells will be installed and a vacuum blower will be installed to remove
hydrocarbon vapors from the soil through the SVE wells. Figure 1 shows the proposed SVE
well locations. The vapors will pass through a series of activated carbon drums to remove
hydrocarbons prior to emission to the atmosphere. Emission samples will be collected and
analyzed for benzene, toluene, ethylbenzene, total xylenes, naphthalene, and total petroleum
hydrocarbons using Method TO-15.

Samples will be collected soon after startup, and quarterly afterwards. Emission reports will
be prepared and submitted to DAQ after each sampling event.

Notice to Treat Contaminated Soil, Offshore Marina, Release NYH, Ticaboo, Utah

718 E. Bridger Lane  Elk Ridge, Utah 84651  Phone [phone]  [e-mail]
If you have any questions, please contact me at [phone].

Thank you,
David S. Hansen
Certified UST Consultant CC 130
Rockwell Solutions, Inc.
Figure 1 Proposed SVE Wells
Offshore Marina
Highway 276, Mile Marker 30
Lake Powell, UtahNORTH
Approx. scale in feet
00 20
aterW
Gas
Sewer
etElcric
Telephone
tSorm Drain
Proposed SVE Well (vertical)
2021 Excavation
Area
Proposed SVE Well (angled)
Blower
and Stack
Figure2 Excavation Area
Offshore Marina
Highway 276, Mile Marker 30
Lake Powell, UtahNORTH
Approx. scale in feet
00 20
aterW
Gas
Sewer
etElcric
Telephone
tSorm Drain
Sampling Location
SW,4’
SW,6’
SW,2.5’
SW,1.5’
NW,6.5’
N1,1.5’
B1,6.5’
NW,5’
Figure 3 Sample Location Map
Offshore Marina
Highway 276, Mile Marker 30
Lake Powell, UtahNORTH
aterW
Gas
Sewer
etElcric
Telephone
tSorm Drain
Map prepared by Partner ESI
Sample Date
MTBE
(mg/kg)
Benzene
(mg/kg)
Toluene
(mg/kg)
Ethyl-
benzene
(mg/kg)
Xylenes
(mg/kg)
Naph-
thalene
(mg/kg)
TPH-DRO
(mg/kg)
0.2 0.2 9 5 142 51 500
TP-7@3 9/23/2020 <0.00124 <0.00124 <0.00621 <0.00310 <0.00807 <0.0155 <4.43
TP-7@6 9/23/2020 <0.00119 <0.00119 <0.00597 <0.00298 <0.00776 <0.0149 <4.36
TP-8@4' 9/23/2020 0.0413 <0.00884 1.51 1.83 9.45 2.88 9,040
TP-8@7' 9/23/2020 <0.00123 <0.00123 0.00778 0.00995 0.0683 0.121 489
TP8@10' 9/23/2020 <0.00141 <0.00141 <0.00706 <0.00353 0.00978 <0.0176 8
SS-1-B-E 9/23/2020 0.069 <0.0242 2.17 2.19 11.1 3.57 9,330
SS-2-B-C 9/23/2020 0.274 <0.0897 9.8 9.78 46.8 9.13 20,000
SS-3-B-W 9/23/2020 <0.115 <0.115 0.595 5.33 36.6 13.8 26,500
SS-4-SWE 9/23/2020 0.0653 <0.0594 2.22 2.48 10.5 6.26 7,170
SS-5-NEW 9/23/2020 0.119 <0.0426 3.49 3.68 20 7.59 17,200
SS-6-SWW 9/23/2020 0.486 <0.0595 17.4 16.5 84.4 16.4 29,200
SS-7-NWW 9/23/2020 0.00189 <0.305 0.0721 0.164 0.803 0.305 20,600
SS-8-WW 9/23/2020 0.136 <0.0579 4.66 5.78 31.7 11 11,900
SW, 1.5'3/23/2021 NA <0.01 <0.03 <0.03 <0.03 <0.03 159
SW, 2.5'3/23/2021 NA <0.01 <0.03 <0.03 <0.03 <0.03 <54
SW, 4'3/23/2021 NA <0.01 <0.03 <0.03 <0.03 <0.03 <64
SW, 6.5'3/23/2021 NA <0.01 <0.03 <0.03 <0.03 <0.03 <59
NW, 5'3/23/2021 NA <0.01 <0.03 <0.03 <0.03 <0.03 <59
NW, 6.5'3/23/2021 NA <0.01 <0.03 <0.03 <0.03 <0.03 <54
N1, 1.5'3/24/2021 NA <0.01 <0.02 <0.02 <0.02 <0.02 113
N1, 2.5'3/24/2021 NA <0.01 <0.03 <0.03 <0.03 <0.03 <54
N1, 4'3/24/2021 NA <0.01 <0.03 <0.03 <0.03 <0.03 <55
B-1, 6.5'3/25/2021 NA <0.01 <0.03 <0.03 <0.03 <0.03 <53
MBTEXN analyzed by EPA Method 8260
TPH-DRO = Total Petroleum Hydrocarbons-Diesel Range Organics, analyzed by EPA Method 8015
Table 1
Soil Sample Results in Proposed Remediation Area
Offshore Marina
Highway 276, Mile Marker 30, Lake Powell, Utah
Initial Screening Levels
Excavation conducted March 22-25, 2021