20221617 Ver 1_11 - RD200482 Eastfield Crossing Development - Warehouse Facility Addendum Letter 09_24_2020_20230301

610 Spring Branch Road
Dunn, North Carolina 28334
Ph: (910) 292 - 2085
www.BuildinciAndEarth.com
Geotechnical, Environmental, and Materials Engineers
September 24, 2020
AdVenture Developers, LLC
111 East Oak Street
Selma, North Carolina 27576
Attention: Mr. Mark McDonne
Subject: Report of Subsurface Exploration and Geotechnical Evaluation
Addendum #1
Eastfield Crossing Development — Warehouse Facility
Selma, North Carolina
Building & Earth Project No.: RD200482
Dear Mr. McDonnell:
Building & Earth Sciences, LLP. is pleased to provide this addendum to the previously
submitted Subsurface and Geotechnical Evaluation report for the subject project (Building
& Earth Project No. RD200482), dated September 11, 2020. Based on the information
provided by Mr. Josh Lamb of ARCO Design/Build, we understand that the structural
loading conditions anticipated in our report were revised and that the actual loading
conditions will be less than the originally anticipated loads. We understand the proposed
warehouse facility will have column loads on the order of 100 kips and wall loads on the
order of 5 kips per linear foot.
A new grading plan was also available at the time of this letter. Based on the provided
Grading Plan, prepared by Bohler Engineering NC, LLP, dated August 28. 2020, the
proposed warehouse F.F.E. will be 170.50 feet. Fills less than 2 feet (excluding
undercutting) and cuts less than 2.5 feet will be required in the building area to reach the
proposed finished grade. In the parking and drive areas, fills up to 1 foot and cuts up to
5 feet will be required to reach proposed finished grades.
Assuming that our site preparation and grading recommendations presented in the report
(Section 4.0) are implemented, and given the revised building loads and revised F.F.E.,
settlement due to shallow foundations designed using an allowable soil bearing capacity
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Subsurface Exploration and Geotechnical Evaluation, Addendum #1
Eastfield Crossing Development — Warehouse Facility, Selma, North Carolina
Project No.: RD200482, September 24, 2020
of 2,500 psf was re-evaluated using the computer program Settle 3D, developed by
Rocscience. Soil consolidation parameters were estimated based on available empirical
data, our engineering judgement, and our experience with similar soils. A consolidation
test was not performed for this site. The total settlement under foundation loads
designed using an allowable soil bearing capacity of 2,500 psf was estimated to be
approximately 1.7 inches, which is considered excessive and not within the tolerable limits.
To reduce the estimated total settlement, the proposed building can be supported on
conventional shallow foundations designed using an allowable soil bearing capacity of
1,500 psf. Total settlement due to foundations designed as such and bearing 24 inches
below the adjacent exterior grade should be on the order of 1 inch or less with differential
settlement less than 0.5 inches. The output from Settle 3D is attached to this letter. If a
higher bearing capacity is desired, a different type of foundation or soil
improvement method will be required. Refer to Section 5.2 of the report.
We recommend that the foundation excavations be evaluated during construction to
verify the design bearing values. We recommend hand rod probing and dynamic cone
penetrometer (DCP) testing, in accordance with ASTM STP-399, be performed for all
foundation excavations. Hand rod probing should be performed for 100 percent of the
excavations, and DCP testing should be performed for at least 20 percent of the column
footings, with 1 test per 75 linear feet in strip footings. Soils not meeting the allowable
capacity recommendations above should be stabilized, undercut, and backfilled with
compacted structural fill, or washed NCDOT No. 57 stone wrapped in non -woven filter
fabric. Undercut depths may vary depending upon conditions observed during
construction.
We appreciate the opportunity to provide consultation services for the proposed project.
If you have any questions regarding the information in this letter or need any additional
information, please call us.
Respectfully Submitted,
BUILDING & EARTH SCIENCES, LLP.
Monique Lumpkin
Field Professional
Attachments: Revised Boring Layout, Settle 3D Output
Page 12
Kurt Miller, PEA
Regional Vice Presi t

Unit
Sat. Unit
s
Material Name
Color
Weight
Weight
(k
(ku)
Cc
Cr
OCR
e0
(kips/ft3)
(kips/ft3)
New Structural Fill - CL
®
0.115
0.12
-
-
0.1827
0.0216
6
0.72
Very Stiff Sandy Lean Clay (CL)
■
0.118
0.126
-
-
0.1
0.01
4.5
0.6
Medium Dense SP-SC
❑
0.12
0.135
1000
1000
-
-
-
-
Medium Stiff Sandy Lean Clay
❑
0.118
0.126
-
-
0.122
0.011
1.5
D.498
(CL)
0 5 10 15 20
Total Settlement
(in)
0.0C
0.11
0.22
0.33
0.44
0.55
0.66
0.77
0.88
—*— 0.99
1.1C
max (stage): 1.03 it
max (all): 1.03 it
---------------
-
RD200482 Eastfield Crossing Development - Warehouse Facility
BUILDING+ • Ana/ysisDescnotion Settlement Analysis
Drawn By IRE Company Building and Earth Sciences, Inc.
Geotechnical, Environmental, and Materials Engineers
3ETTLE3D 4.023
Date 9/10/2020, 3:53:55 PM File Name Settlement at B-15(1500).s3z

Total Settlement
(in)
—
0.0C
N
0.18
N
0.36
0.54
0.72
0.9C
1.08
1.26
0
1.44
N
1.62
1.8C
max (stage):
1.71 it
0
max (all):
1.71 it
1.7
Column Load, 2500 psf
o
_
Unit Sat. Unit
Es
Eur
Material Name
Color Weight Weight
(ksf)
(ksf)
Cc Cr OCR e0
---
(kips/ft3) (kips/ft3)
_
__ __
-l-
New Structural Fill - CL
®
0.115
0.12
-
-
0.1827 0.0216 6
0.72
-
Very Stiff Sandy Lean Clay (CL)
■
0.118
0.126
-
-
0.1 0.01 4.5
0.6
-�
Lt1
Medium Dense SP-SC
❑
0.12
0.135
1000
1000
- - -
-
Medium Stiff Sandy Lean Clay ■ 0.118 0.126 - - 0.122 0.011 1.5 0.498
L) (C
O
0 5 10 15 20
Project
RD200482
Eastfield Crossing Development -
Warehouse Facility
BUILDINGAna/ysisDescnotion
Settlement Analysis
Drawn By
IRE
Company
Building and Earth Sciences, Inc.
Geotechnical,
Environmental, and Materials
Engineers
Date
9/10/2020, 3:53:55 PM
File Name
Settlement at B-15(2500).s3z
SETTLED 4.023