WS-9333_44564_CA_CAI_20210901_FS-Email

From:rbshah
To:Lepard, Mindy
Subject:Re: [External] 44564 - Eagle Mart 2 - Corrective Action Feasibility Study
Date:Wednesday, September 1, 2021 5:56:36 PM
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Mindy,

Sorry for the delay. Please see below for the response to your questions. If you have any further questions or
need additional information, please call/email me. Thanks.

Raj

Raj B. Shah, P.E., LEED®APTechnical DirectorAgra Environmental, Inc.P.O. Box 5611Cary, North Carolina 27513Office: [phone] Ext. 101Mobile: [phone]Fax: (919) [e-mail]

From: "Lepard, Mindy" <[e-mail]>
Date: Tuesday, July 13, 2021 at 3:32 PM
To: "[e-mail]" <[e-mail]>
Subject: FW: [External] 44564 - Eagle Mart 2 - Corrective Action Feasibility Study

Raj,

I just sent this email to Aaron Springer and saw that he left the company. I copied you on that email but see that
it may be an old address so I thought I’d send this to you at the email address in Aaron’s automatic reply to
make sure you get it. I apologize if you are receiving it twice.

The Corrective Action Branch and Trust Fund Branch met last week to review the recommendations in the
Feasibility Study Report. We have a few questions and suggestions from the report before we all meet to discuss
the remedial strategy.

What is the depth of the injections? The depth of the injections is outlined in the feasibility study in
section 9. On injections near MW-1, MW-2, and MW-6 the target treatment zone is 15’-35’ and near MW-
10 the treatment zone is 12’-32’. The PRB injection depth will be between 10’-30’.
What was the radius of influence of the injections from the pilot study? Not available as there are no
other monitoring wells/points in the immediate vicinity of MW-2 that we could have used during the pilot
test. Based on our past experience and as a rule of thumb 5 to 7 feet is a good estimate of the radius of
influence of each injection point.
How did you arrive at 12,780 pounds of Klozur CR?
Klozur-CR Estimate for Graham, NC Site
Area
Number of
IPs
KCR, lbs
per IP
Volume of 20%
KCR slurry per
point, gal Total Mass of KCR, lb Total KCR Slurry, gal
MW-1 16 270 146 4,320 2,336
MW-2 6 270 146 1,620 876
MW-6 6 270 146 1,620 876
VEW-1 1 270 146 270 146
MW-10 12 225 122 2,700 1,464
RB 10 225 122 2,250 1,220
otal 51 12,780 6,918
Would it be better to install another monitoring well between MW-10 and MW-12 before putting in the
reactive barrier to better define the amount of contamination in that area? As MW-12 is known to be
contaminated, we do not recommend installation of an additional well between MW-10 and MW-12. It is,
however, recommended that a shallow monitoring well (MW-16) be installed along the southern property
edge. Additionally, a new vertical extent well (VEW-3) should be installed near the property edge in line
with the source area and SW-2

Could you conduct a packer test on SW-2 to test where the MTBE may be coming into the well? Maybe
pack off below 90 feet and collect a sample. A packer test would not be an option for SW-2 since it is an
open borehole well with extremely fractured (vertical and horizontal) rock. There would be no way to
isolate zones with no communication from other depths.

We will schedule a meeting when you’ve had time to look over these questions and are ready to discuss the
remedial strategy. Let me know if you have any questions and the timeframe that you think you’ll need.

Thanks,
Mindy

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From: Aaron D Springer <[e-mail]> On Behalf Of [e-mail]
Sent: Friday, May 7, 2021 1:49 PM
To: Lepard, Mindy <[e-mail]>
Cc: [e-mail]
Subject: [External] 44564 - Eagle Mart 2 - Corrective Action Feasibility Study

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Report Spam.

Mindy,

The Corrective Action Feasibility Study for Incident #44564 Eagle Mart 2 has been uploaded to the CAB WS FTP
file folder.

Thank you,
Aaron D. SpringerEnvironmental ScientistAgra Environmental, Inc.P.O. Box 5611Cary, North Carolina 27512Mobile: [phone]Office: [phone]Fax: (919) [e-mail]