25009_East Side Truck Svc_Utility Trench Dam w approval_20230222

Graham, Stephanie J
From: Graham, Stephanie J
Sent: Wednesday, February 22, 2023 11:18 AM
To: Cheryl Moody
Cc: Nick Patel; Eckard, Sharon
Subject: RE: [External] Eastside trucking
Hi Cheryl - The Utility Trench Vapor Mitigation Design dated February 20, 2023 is approved. Please let me know wher
the installation date is confirmed, and be sure to follow the approved EMP during removal of the previous barrier and
installation of the approved one. Also, just a reminder to document all steps of the installation through photographs,
and provide all applicable information/documentation in the subsequent installation report.
Thanks,
Stephanie
Stephanie Graham
Project Manager, Brownfields Redevelopment Section
Division of Waste Management
North Carolina Department of Environmental Quality
Office: [phone] 1 Cell: [phone]
[e-mail]
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NORTH CAROLINA
Department of Environmental Quality
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From: Cheryl Moody <[e-mail]>
Sent: Tuesday, February 21, 2023 9:50 AM
To: Graham, Stephanie J <[e-mail]>
Cc: Nick Patel <[e-mail]>
Subject: [External] Eastside trucking
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Stephanie,
Please see attached final drawing for your review. Once we have approval we will move forward to schedule the work.
Thank you.
Cheryl J. Moody, PE, REM, CIEC, CMRS
Principal Engineer
Owner

LEED Green Associate
Atlantic Shores Environmental Services, Ltd.
175-1 Venture Drive
Belville, North Carolina 28451
910-371-5980 (o)
910-512-5321 (c)
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Utility Trench Vapor Mitigation Design
Spring Hill Suites
520 Judson Church Road
Fayetteville, Cumberland County, NC 28312
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ECS Southeast, LLP
5260 Greens Dairy Road
Raleigh, NC 27616
Phone: [phone]
NC Registered Engineering Firm F-1078
DATE: February 20, 2023
PREPARED BY.'
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ECS Southeast
5260 Greens Dairy Rd.
Raleigh, NC 27616
DRAWING LIST
PAGE(S)
DESCRIPTION
0
COVER
1
NOTES AND DETAIL
2
SITE PLAN

1. APPLICABILITY
1.1.GENERAL
1.1.1. The purpose of this Utility Trench Vapor Mitigation Design at the proposed development is
to manage vapor gas migrating through the utility trench.
1.1.2. All wall and building systems shown are for clarification purposes only. These plans are
only for layout and construction of the Utility Trench Vapor Mitigation Design. Civil
layouts, structural details, and other information pertaining to the design was referenced
from the available plans supplied to ECS Southeast. The design may be modified by ECS, as
necessary, to accommodate construction restraints.
1.2.SYSTEM COMPONENTS
1.2.1. The Utility Trench Vapor Mitigation Design construction shall consist of, but not be limited
to, the following:
1.2.1.1. A trench dam consisting of a bentonite cement slurry with 4% Type II Portland
cement and 2% powdered bentonite shall be poured in place in utility trench.
1.2.1.2. Trench dam shall have a minimum length of 36 inches or twice the width of the
trench.The cross section of the utility trench shall be backfilled to provide a minimum
of 12 inches of trench dam material around the utility pipe.
1.2.1.3. The trench dam material shall be sufficiently hydrated.
1.3. SUBMITTALS
1.3.1. Information about the products shall be submitted to ECS for approval before they are
installed.
1.4.INSPECTIONS AND TESTING
1.4.1. Construction Phase
1.4.0.1.Inspections shall be conducted under the direct supervision of a North Carolina
licensed Professional Engineer to verify compliance with this design and to determine
if the sealed utility barrier has been constructed between soil gas from the VOC
impacted side of the utility trench to the Springhill Suites side of the utility trench.
Inspections shall be conducted during the following:
1.4.0.1.1. During placement of trench dam material.
1.4.0.1.2. During placement of backfill material on either side and over the top of the
trench dam.
1.5. STANDARD OF CARE AND LIMITATIONS
1.5.1 ECS's services will be performed in a manner consistent with generally accepted practices
of the profession undertaken in similar designs in the same geographical area during the
same time period. Please note that ECS does not warrant the work of third parties
supplying information used in the preparation of the vapor mitigation system. These
services were performed in accordance with the scope of work agreed with you, our client,
as reflected in our proposal.
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ECS Southeast, LLP
5260 Greens Dairy Road
Raleigh, NC 27616
Phone: [phone]
NC Registered Engineering Firm F-1078
PCE IMPACTED AREA - — SPRINGHILL SUITES
ASPHALT
GRAVEL
SOIL BACKFILL
ZONE OF BENTONITE
CEMENT SLURRY
(4% TYPE II PORTLAND CEMENT
& 2% POWDERED BENTONITE)
SEAL AROUND
PENETRATION
PIPE BEDDING
MATERIAL BY
OTHERS
NOTES:
1. TRENCH DAM SHALL HAVE A MINIMUM LENGTH OF 36 INCHES OR
TWICE THE WIDTH OF THE UTILITY TRENCH.
2. A MINIMUM OF 12 INCHES OF TRENCH DAM MATERIAL SHALL
SURROUND THE UTILITY PIPE.
A SECTION ALONG STORM WATER
1 PIPING TRENCH

:MU114
Legend ICAN
LLC.
■ - Soil Gas Sample Point TY
-Groundwater Monitoring Well
o - Soil Sample Location
Red Text Indicates Exceedance for Groundwater
Green Text indicates Exceedance for Soil Vapor
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5260 Greens Dairy Road
Raleigh, NC 27616
Phone: [phone]
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Scale
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PWC 20
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NC Registered Engineering Firm F-1078