SW3230302_Soils/Geotechnical Report_20240417

NEWTECH Engineering, PLLC
December 19, 2022
Mr. Faris Hussain
Tramar Global, LLC
PO Box 2617
Monroe,North Carolina 28111
Email: [e-mail]
Subject: Estimated Seasonal High Water Table (ESHWT) Determination
Davis Village Site
Phifer Road
Wingate, North Carolina
NewTech Project No. 124.003
Dear Mr. Hussain:
NewTech Engineering, PLLC. (NewTech) is pleased to submit this letter summarizing our
observations of the Test Pits as related to Estimated Seasonal High Water Table (ESHWT) depth
determination at the Davis Village site. The test pits were performed at the location of the sand
filters to be constructed at the subject site. This report contains a brief description of the project
information provided to us, general site and subsurface conditions revealed during the exploration.
The primary purpose of this study was to obtain information regarding the subsurface conditions
at the proposed sand filters, assess the engineering characteristics of the subsurface materials, and
determination of estimated seasonal high water table depth/elevation (if evident). This report
contains the following items:
• Photographic Logs, Site Vicinity Map and Test Location Plan,
• Summary of Observations, visual soil classifications and descriptions,
• A general review of the subsurface soils and estimated seasonal high water table depth
from existing ground surface (if evident),
• Groundwater level measurements.
2630 South Tryon Street—Suite F • Charlotte,North Carolina 28203 • 704.258.3755 •www.newtechgeo.com

Summary of ESHWT Deteuuination—Revision 1 NewTech Project No. 124.003
Davis Village Site December 19,2022
EXPLORATION PROCEDURES
NewTech visited the site on December 16, 2022 and completed two (2) Test Pits (identified as
TP-1 and TP-2) in the proposed sand filters. The approximate location of the Test Pits is shown
on Figure 2 — "Test Location Plan" provided in Appendix 2. Pott Hound Engineering, PLLC
provided us with a plan titled"Davis Village Phifer Road Wingate, NC — Overall Grading Plan—
Sheet Index" dated May 1, 2022 that indicated the approximate locations of the proposed sand
filters. The test location was located from their plans by NewTech personnel.
The Test Pits were advanced to depths of approximately 5 feet below the existing ground surface.
The soil samples were collected to be visually examined and classified in general accordance
with ASTM D-2488. The Munsell Soil Color Charts (2009 Revision) were used to identify the
hue, value, and chroma of soil samples. The classification symbols are depicted on the "Test Pit
Observation Logs" provided in Appendix 3.
GENERALIZED SUBSURFACE STRATIGRAPHY
General subsurface conditions observed during our geotechnical study are described herein. For
more detailed soil descriptions and stratifications at a particular test location, the respective"Test
Pit Observation Log" provided in Appendix 3 should be reviewed. The horizontal stratification
lines designating the interface between various strata represents approximate boundaries.
Transitions between different strata in the field may be gradual in both the horizontal and vertical
directions.
Beginning from the ground surface, a layer of Cultivated Fill Soils (surficial organic soils) was
observed at the existing ground surface with a thickness of approximately 18 inches. Beneath the
topsoil layer, residual (undisturbed) soils were encountered that consisted of elastic silts. Partially
Weathered Rock(PWR) known in the local area as Union County "Shale Rock" was encountered
underlying the residual soils and extended to Excavator Refusal.
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Summary of ESHWT Deteuuination—Revision 1 NewTech Project No. 124.003
Davis Village Site December 19,2022
GROUNDWATER LEVEL MEASURMENTS
Groundwater was not observed in the Test Pits at the time of completion and after 24 hours.
However, perched ground water was observers on top of the PWR surface encountered in the Test
Pits, Please note that groundwater levels tend to fluctuate with seasonal and climatic variations,
as well as with some types of construction operations.
ESTIMATED SEASONAL HIGH WATER TABLE
The ESHWT is the highest average depth of water during the wettest season. The ESHWT is
defined as a change in the color of the soil layer due to water staining (typically, gray
redoximorphic depletions and mottling). Spots or blotches of different color or shades of color
interspersed with a dominant color in soil, commonly referred to as mottling. Mottling is a historic
indication for the presence of ground water caused by intermittent periods of saturation and drying
and may be indicative of poor aeration and impeded drainage. Mottling is a"general indication of
groundwater" flowing through this layer, but it is not known whether the groundwater flow was
recent or ancient.
3

Summary of ESHWT Deteuuination—Revision 1 NewTech Project No. 124.003
Davis Village Site December 19,2022
CONCLUSIONS
Based on our observations, Estimated Seasonal High Water Table (ESHWT) indicators (water
stained soils) were evident in soils sampled in the Sand Filter TP-1 and TP-2. However, it is our
finding that the water is not the true ESHWT but rather perched water on top of the PWR and it
percolates downward to the top of the rock surface flowing through the rock to the true water table
below the top of rock in the project area. The following table summarizes the results of the borings
and our observations.
Summary Table of the Boring Results and Our Observations
Test Pit
Test Existing Ground Prop. SF Bottom Termination ESHWT
Location Elevation (ft-msl) Elevation (ft-msl) Depth Depth GW Depth
(Feet)1 (Feet)1 (Feet)1
TP-1 z574.50 573.50 5 NE NE
SH-2 =551.61 SAND
5 NE NE
1 Depths from existing ground surface.
NE—Not Encountered in the borings.
NP—Not Provided
The analyses and recommendations submitted in this report were based, in part, on data obtained
from this study. If the above-described proj ect conditions are incorrect or changed after the
issuance of this report, or subsurface conditions encountered during construction are different from
those reported, NewTech should be notified, and these recommendations will be re-evaluated
based on the changed conditions to make appropriate revisions. We have prepared this report
according to generally accepted geotechnical engineering practices. No warranty, express or
implied, is made as to the professional advice included in this report.
4

Summary of ESHWT Deteuuination—Revision 1 NewTech Project No. 124.003
Davis Village Site December 19,2022
CLOSING
NewTech appreciates the opportunity to provide our professional services to you on this project. If
you have any questions concerning the information in this report or if we may be of further service,
please contact us at 704.400.7826.
Sincerely,
NEWTECH
Andrew Cornelius Kerry C. Cooper, PE 12/19/22
Construction Services Manager Chief Engineer
NEWTECH NC COA No. P-2236
LIST OF APPENDICES
1 Photographic Log
2 Figure No. 1 — Site Vicinity Map
Figure No. 2 —Test Location Plan
3 Test Pit Observation Logs
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Summary of ESHWT Deteuuination—Revision 1 NewTech Project No. 124.003
Davis Village Site December 19,2022
APPENDIX 1
Photographic Logs
1

Summary of ESHWT Deteuuination—Revision 1 NewTech Project No. 124.003
Davis Village Site December 19,2022
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2

NewTech Project No. 124.003
• • 1
December 19,2022
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3

Summary of ESHWT Deteuuination—Revision 1 NewTech Project No. 124.003
Davis Village Site December 19,2022
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4

Summary of ESHWT Deteuuination—Revision 1 NewTech Project No. 124.003
Davis Village Site December 19,2022
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5

Summary of ESHWT Deteuuination—Revision 1 NewTech Project No. 124.003
Davis Village Site December 19,2022
APPENDIX 2
Figures
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64 Ac. Wingate Tract I ,.! F r L end
Site Lacatinn I - r • _ 11° 1 • Feature 7
, / t l a ..i R s -,„/ 1 — Pfiter Road
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Figure 1 NewTech 64 Ac Wingate Tract Site
Site Vicinity Map Engineering, PLLC Wingate, NC
Scale: NTS Project No.: 124.003

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Figure 2 NewTech 64 Ac Wingate Tract Site
Test Location Plan Wingate, NC
Scale: NTS Engineering, PLLC
Project No.: 124.003

Summary of ESHWT Deteuuination—Revision 1 NewTech Project No. 124.003
Davis Village Site December 19,2022
APPENDIX 3
Test Pit Observation Logs
1

Summary of ESHWT Deteuuination—Revision 1 New Tech Project No. 124.003
Davis Village Site December 19,2022
SUMMARY OF TEST PIT OBSERVATIONS SHEETS
64 ACRE WINGATE TRACT SITE
WINGATE, NORTH CAROLINA
NEWTECH PROJECT NO. 124.003
Test Pit Depth
Number (feet)* Soil Description
TP 1 0— 1.5 Approximately 18" of Cultivated Soils
1.5—4 RESIDUUM: Tan Red Brown Elastic SILT
4—5 Union County Shale Rock(PWR) —Difficult Excavation @ -4 Ft
Some Mottling and Grey Stained Evidence of Perched Water
5 Excavator Refusal @-5 Feet bgs
No Groundwater or Perched Water Encountered in Test Pit
TP 2 0— 1.5 Approximately 18" of Cultivated Soils
1.5—2.5 RESIDUUM: Tan Brown Elastic SILT
2.5—3 Union County Shale Rock(PWR) Difficult Excavation -2.5 Ft
Perched Water @ 2.5 Ft
3 Excavator Refusal @-3 Feet bgs Offset
OFFSET 5 Excavator Refusal @-5 Feet bgs
4 Ft
Perched Water Encountered at 2.5 Ft.
No Groundwater Encountered in Test Pit
*Referenced from existing ground elevation
Note: Test Pits Performed with a Kubota BX9142 Mini-Excavator
2