NCG510551_correspondence_20230308

Weaver, Charles
From: D'Souza, Flora <[e-mail]>
Sent: Wednesday, March 8, 2023 4:58 PM
To: Weaver, Charles
Subject: [External] FW: New Remediation System Specs
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Charles,
Please let me know if the information below is what you need for the permit. If you need actual specs, I'll ask for those.
Thank you,
Flora
From: Scott Lato <[e-mail]>
Sent: Wednesday, March 8, 2023 4:55 PM
To: D'Souza, Flora <[e-mail]>
Cc: Ryals, Scott <[e-mail]>; Jan Dekker <[e-mail]>; James, Matt
<[e-mail]>
Subject: Re: New Remediation System Specs
Flora,
Description summary below:
The new remedial system recovers groundwater and free product (heating oil) via a network of twenty-eight (28)
pneumatic submersible pumps. Each pump is individually controlled and plumbed back to a main header pipe via a
manifold. The design nominal pumping rate of 3.0 gpm is controlled via individual pressure regulators while the total
recovered flow is measured with individual flow totalizers.
The combined groundwater and free product is separated in a 100 gpm oil water separator (OWS) with the
groundwater continuing on in the process stream, while the free product is drained into a reservoir tank followed by a
temporary 550 gal. double walled storage tank. The groundwater is routed through a pair of aeration venturis to aid in
the removal of some of the dissolved iron. From the settling/aeration tanks, the water is passed through a bank of four
(4) bag filters, plumbed in series and parallel to permit bag changes without shut down. Following the bag filters water
is pumped into an air stripper followed by a second bank of bag filters and ScalePro 400. From the bag filters the
process water is routed through a pair of 1,000 lb liquid phase carbon vessels plumbed in series. The vessels are
interconnected with a pneumatic valve backwash manifold system to ensure optimal operation. The discharge from
liquid phase carbon vessels passes through a flow totalizer with 4-20mA output to the PLC (total and instantaneous flow
rates), to the discharge pipe, with the effluent flow discharging at the historical location off site.
Let me know if this is what you need.
Scott
On Tue, Mar 7, 2023 at 9:08 AM D'Souza, Flora <[e-mail]> wrote:

Gentlemen,
I have been in communication with Charles Weaver about what information he needs to make sure our general
discharge permit is up to date prior to starting the new system. He said that all he needs is a detailed description of the
new remediation system.
Please email a copy of the new system details to me as soon as you can so I can get that to Mr. Weaver and have our
permit file complete and up to date.
Thank you,
Flora D'Souza, CHMM
Environmental Project Scientist II WithersRavenel
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6201 Fairview Road, Suite 200 1 Charlotte, NC 28201
Office:704.919.1242 1 Direct:919.678.3830
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Scott Lato
SpartOx Division Manager
Product Recovery Management, Inc.
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