DERR-2025-000685

Allison Stanley <[e-mail]>
Paxton - Site Characterization Report
6 messages
Brent Robinson <[e-mail]>Mon, Dec 2, 2024 at 1:14 PM
To: Allison Stanley <[e-mail]>
Cc: Bruce Bastian <[e-mail]>, Brian Smith <[e-mail]>
Hello Allision,

Per our recent discussion, attached is the Site Characterization Report for the Paxton site. Please let us
know if you have some time this week for us to walk you through the report to aid your review and discuss
any preliminary questions or comments that you may have.

Thanks and best regards,

Brent

Brent C. Robinson, P.E.
Senior Principal Engineer

215 South State Street, Suite 500
Salt Lake City, Utah 84111
Phone: [phone] Mobile: [phone]
E-mail: [e-mail]

GEOSYNTEC | SIREM | SAVRON | GREEN HARBOR ENERGY

1/27/25, 7:45 AM State of Utah Mail - Paxton - Site Characterization Report
https://mail.google.com/mail/u/0/?ik=e22438591e&view=pt&search=all&permthid=thread-f:1817361048731204541&simpl=msg-f:18173610487312045…1/8

Paxton SCR 12-2-24.pdf
31913K
Allison Stanley <[e-mail]>Mon, Dec 2, 2024 at 4:31 PM
To: Brent Robinson <[e-mail]>
Cc: Bruce Bastian <[e-mail]>, Brian Smith <[e-mail]>
Brent,
Thank you for the report, I'll start the review shortly. I do have some time this Thursday to discuss if you are available. Any
time before noon should work.
Thanks again,
Allison
[Quoted text hidden]
--
Allison Stanley
Environmental Scientist II | VCP/Brownfields Section
P: [phone]
environmentalresponse.utah.gov
Emails to and from this email address may be considered public records and thus subject to Utah GRAMA
requirements.
Brent Robinson <[e-mail]>Mon, Dec 2, 2024 at 4:51 PM
To: Allison Stanley <[e-mail]>
Cc: Bruce Bastian <[e-mail]>, Brian Smith <[e-mail]>
Great – I’ll send you a calendar invite with an access link for a quick call on Thursday morning.

Thanks!

Brent

From: Allison Stanley <[e-mail]>
Sent: Monday, December 2, 2024 4:31 PM
To: Brent Robinson <[e-mail]>
Cc: Bruce Basan <[e-mail]>; Brian Smith <[e-mail]>
Subject: Re: Paxton - Site Characterizaon Report

1/27/25, 7:45 AM State of Utah Mail - Paxton - Site Characterization Report
https://mail.google.com/mail/u/0/?ik=e22438591e&view=pt&search=all&permthid=thread-f:1817361048731204541&simpl=msg-f:18173610487312045…2/8
CAUTION: This email originated from outside of the organizaon. Do not click links or open aachments unless you recognize
the sender and know the content is safe. If you have any suspicion, please confirm with the sender verbally that this email is
authenc. If you suspect fraud, click "Phish Alert Report."

Brent,

Thank you for the report, I'll start the review shortly. I do have some time this Thursday to discuss if you are available. Any
time before noon should work.

Thanks again,
Allison

On Mon, Dec 2, 2024 at 1:15 PM Brent Robinson <[e-mail]> wrote:
Hello Allision,

Per our recent discussion, attached is the Site Characterization Report for the Paxton site. Please let us
know if you have some time this week for us to walk you through the report to aid your review and discuss
any preliminary questions or comments that you may have.

Thanks and best regards,

Brent

Brent C. Robinson, P.E.
Senior Principal Engineer

215 South State Street, Suite 500
Salt Lake City, Utah 84111
Phone: [phone] Mobile: [phone]
E-mail: [e-mail]

1/27/25, 7:45 AM State of Utah Mail - Paxton - Site Characterization Report
https://mail.google.com/mail/u/0/?ik=e22438591e&view=pt&search=all&permthid=thread-f:1817361048731204541&simpl=msg-f:18173610487312045…3/8
GEOSYNTEC | SIREM | SAVRON | GREEN HARBOR ENERGY

--
Allison Stanley
Environmental Scientist II |
VCP/Brownfields Section
P: [phone]
environmentalresponse.utah.gov
[Quoted text hidden]
Brent Robinson <[e-mail]>Fri, Dec 6, 2024 at 4:02 PM
To: Allison Stanley <[e-mail]>
Cc: Bruce Bastian <[e-mail]>, Brian Smith <[e-mail]>
Allison,

Thank you for making time to speak with us yesterday regarding the Paxton SCR. Per our discussion, I’ve
attached a drawing that shows the floor plan for the future development.

We look forward to any further questions or comments you may have as you complete your review.

Best regards,

Brent

1/27/25, 7:45 AM State of Utah Mail - Paxton - Site Characterization Report
https://mail.google.com/mail/u/0/?ik=e22438591e&view=pt&search=all&permthid=thread-f:1817361048731204541&simpl=msg-f:18173610487312045…4/8

Brent C. Robinson, P.E.
Senior Principal Engineer

215 South State Street, Suite 500
Salt Lake City, Utah 84111
Phone: [phone] Mobile: [phone]
E-mail: [e-mail]

GEOSYNTEC | SIREM | SAVRON | GREEN HARBOR ENERGY

From: Allison Stanley <[e-mail]>
Sent: Monday, December 2, 2024 4:31 PM
To: Brent Robinson <[e-mail]>
Cc: Bruce Basan <[e-mail]>; Brian Smith <[e-mail]>
Subject: Re: Paxton - Site Characterizaon Report

CAUTION: This email originated from outside of the organizaon. Do not click links or open aachments unless you recognize
the sender and know the content is safe. If you have any suspicion, please confirm with the sender verbally that this email is
authenc. If you suspect fraud, click "Phish Alert Report."

Brent,

Thank you for the report, I'll start the review shortly. I do have some time this Thursday to discuss if you are available. Any
time before noon should work.

Thanks again,
Allison

On Mon, Dec 2, 2024 at 1:15 PM Brent Robinson <[e-mail]> wrote:
1/27/25, 7:45 AM State of Utah Mail - Paxton - Site Characterization Report
https://mail.google.com/mail/u/0/?ik=e22438591e&view=pt&search=all&permthid=thread-f:1817361048731204541&simpl=msg-f:18173610487312045…5/8
Hello Allision,

Per our recent discussion, attached is the Site Characterization Report for the Paxton site. Please let us
know if you have some time this week for us to walk you through the report to aid your review and discuss
any preliminary questions or comments that you may have.

Thanks and best regards,

Brent

Brent C. Robinson, P.E.
Senior Principal Engineer

215 South State Street, Suite 500
Salt Lake City, Utah 84111
Phone: [phone] Mobile: [phone]
E-mail: [e-mail]

GEOSYNTEC | SIREM | SAVRON | GREEN HARBOR ENERGY

--
1/27/25, 7:45 AM State of Utah Mail - Paxton - Site Characterization Report
https://mail.google.com/mail/u/0/?ik=e22438591e&view=pt&search=all&permthid=thread-f:1817361048731204541&simpl=msg-f:18173610487312045…6/8
Allison Stanley
Environmental Scientist II |
VCP/Brownfields Section
P: [phone]
environmentalresponse.utah.gov
Emails to and from this email address may be considered public records and thus subject to Utah GRAMA
requirements.

012_C400.pdf
1370K
Allison Stanley <[e-mail]>Tue, Dec 10, 2024 at 4:16 PM
To: Brent Robinson <[e-mail]>
Cc: Bruce Bastian <[e-mail]>, Brian Smith <[e-mail]>
Brent,
Thank you for the plans, I appreciate it.
I do have one question at the moment- this may be directed towards Brian. What was your calculation to convert the soil
gas results from ppbv to ug/m^3 (or what calculator did you use)? I've converted a few and they've all been slightly off so I
wanted to verify with you guys first.
(If you were curious why I was asking, we're required to verify the lab sheets with the data tables during our review).
Thanks!
[Quoted text hidden]
--
Allison Stanley
Environmental Scientist II | VCP/Brownfields Section
P: [phone]
environmentalresponse.utah.gov
[Quoted text hidden]
2 attachments
1/27/25, 7:45 AM State of Utah Mail - Paxton - Site Characterization Report
https://mail.google.com/mail/u/0/?ik=e22438591e&view=pt&search=all&permthid=thread-f:1817361048731204541&simpl=msg-f:18173610487312045…7/8
~WRD1941.jpg
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image001.png
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Brian Smith <[e-mail]>Wed, Dec 11, 2024 at 1:21 PM
To: Allison Stanley <[e-mail]>, Brent Robinson <[e-mail]>
Cc: Bruce Bastian <[e-mail]>
Hi Allison,

Thanks for the question.

Just to clarify, we did not perform any calculations on the soil gas data. The lab does the conversion as part
of the analysis and reports the results in both ppbv and ug/m^3. The general calculation to convert from
ppbv to ug/m^3 takes the ppbv result and multiplies it by the molecular weight divided by 24.45 (24.45 is
the volume of a mole of gas at standard temp/pressure). The results presented on the data summary tables
in the report are taken directly from the concentrations presented in the lab reports in units of ug/m^3. Note
– if you are taking the result in ppbv and putting it into automated calculator, or using the calculation above,
you also need to account for rounding, which may be why the results don’t exactly match up. I believe the
results in the lab report are rounded to 3 significant figures.

I hope this answers your question. Let me know if you have further questions or would like to discuss this
further.

Regards,

Brian
[Quoted text hidden]
1/27/25, 7:45 AM State of Utah Mail - Paxton - Site Characterization Report
https://mail.google.com/mail/u/0/?ik=e22438591e&view=pt&search=all&permthid=thread-f:1817361048731204541&simpl=msg-f:18173610487312045…8/8