DC00504_SCOTTS HILL SUPER STREET

STATE OF NORTH CAROLINA
DEPARTMENT OF TRANSPORTATION
JOSH STEIN J.R. "JOEY" HOPKINS
GOVERNOR SECRETARY
January 14, 2025
MEMORANDUM TO: Trevor Carroll, P.E.
Division Engineer
ATTENTION: Katie Hite, P.E.
Division Project Development Engineer
FROM: Tom Santee, P.E.
Assistant State Geotechnical Engineer - Eastern Region
STATE PROJECT: 50524
F.A. PROJECT: N/A
COUNTY: Pender
DESCRIPTION: US 17N from Sidbury Rd to Scotts Hill Loop Rd
SUBJECT: Geotechnical Report - Design and Construction Recommendations
The Geotechnical Engineering Unit (GEU) has completed a review of previous subsurface
investigations that overlap with the current project. Subsurface data from WBS projects 34425.1.1
and 3.107111 indicates the soils along this project are sandy in nature and the ground water is 6 feet
or more below natural ground. The geotechnical recommendations are presented as follows.
I. Slope/Embankment Stability
A. Slope/Embankment Stability
Recommend all roadway slopes be constructed no steeper than 3:1 (H:V).
B. Undercut for Embankment Stability
Recommend 50 cubic yards of Undercut Excavation for embankment stability be included in
the contract as a contingency item to be used at the direction of the Engineer.
C. Geotextile for Soil Stabilization
Include 50 square yards of Geotextile for Soil Stabilization in the contract as a contingency
item to be used at the discretion of the Engineer.
Mailing Address: Telephone: (984) 920-8900 Location:
NC DEPARTMENT OF TRANSPORTATION 3301 JONES SAUSAGE RD. SUITE 100
GEOTECHNICAL ENGINEERING UNIT - Customer Service: 1-877-368-4968 GARNER, NC 27529
EASTERN REGIONAL OFFICE
1570 MAIL SERVICE CENTER
Website: www.ncdot.gov
RALEIGH, NC 27699-1570

50524 Page 2 of 4
II. Subgrade Stability
A. Undercut for Subgrade Stability
Include 50 cubic yards of Undercut Excavation in the contract as a contingency item to be
used at the discretion of the Engineer.
B. Special Ditches
Special ditches are not recommended for this project.
C. Subsurface Drainage - Subsurface Drain
Recommend 50 linear feet of 6" Perforated Subdrain Pipe for subsurface drain (Roadway
Standard Drawing 815.02) be included in the contract as a contingency item to be used at the
discretion of the Engineer.
D. Geotextile for Soil Stabilization
Recommend 50 square yards of Geotextile for Soil Stabilization be included in the contract as
a contingency item to be used in Section II A.
III. Borrow Specifications
A. Borrow Criteria
Common borrow for embankment construction to subgrade shall meet the Exceptions to
Statewide Criteria for Acceptance of Borrow Material, Article 1018-2(B).
B. Select Granular Material
Recommend 100 cubic yards of Select Granular Material be included in the contract for
backfill as a contingency item for Section I. B. and II. A.
Select granular material for embankment/backfill for geotextile for soil stabilization if
required, or backfill in water shall meet the criteria outlined in the Standard Specifications,
Article 1016-3, Class II and/or III.
C. Shrinkage Factor
A shrinkage factor of 25 percent is recommended for calculation of earthwork on this project.
D. Borrow Reconnaissance and Availability
Sandy soils with good to excellent engineering properties are available in nearby areas.

50524 Page 3 of 4
IV. Miscellaneous
A. Reduction of Unclassified Excavation - Loss Due to Clearing and Grubbing
No significant loss of unclassified excavation is anticipated due to clearing and grubbing.
B. Reduction of Unsuitable Unclassified Excavation - Unsuitable Waste
Based on the current roadway plans, unclassified excavation along this project will be
primarily derived from shallow subgrade cuts and ditch excavation. These areas contain
granular soils which are suitable for subgrade construction.
Prepared By: Prepared By:
032171
01/14/2025 01/14/2025
Jinyoung Park, P.E. Tyler C. Bottoms, L.G.
Regional Geotechnical Design Engineer Project Geological Engineer
TGS/JYP/TCB
See Page 4 for Summary of Quantities

WBS Number: 50524 County: PENDER Project Engineer: J. PARK
TIP Number: N/A Field Office / PEF: GREENVILLE Project Geologist: T.C. BOTTOMS
Description: US 17N FROM SIDBURY RD TO SCOTTS HILL LOOP ROAD
Pay Item Pay Item/ Spec Book Section No. or Report Begin End Units /
Alignment Quantity
No. Quantity Adjustment Special Provision (SP) Reference Section Station Station %
0036000000-E Undercut Excavation 225 - Roadway Excavation I. B Contingency N/A N/A 50 CY
0036000000-E Undercut Excavation 225 - Roadway Excavation II. A Contingency N/A N/A 50 CY
Total Quantity of Undercut Excavation = 100 CY
0195000000-E Select Granular Material 265 - Select Granular Material III. B Contingency N/A N/A 100 CY
Total Quantity of Select Granular Material = 100 CY
0196000000-E Geotextile for Soil Stabilization 270 - Geotextile for Soil Stabilization I. C Contingency N/A N/A 50 SY
0196000000-E Geotextile for Soil Stabilization 270 - Geotextile for Soil Stabilization II. D Contingency N/A N/A 50 SY
Total Quantity of Geotextile for Soil Stabilization = 100 SY
2044000000-E 6" Perforated Subdrain Pipe 815 - Subsurface Drainage II. C Contingency N/A N/A 50 LF
Total Quantity of 6" Perforated Subdrain Pipe = 50 LF
These Items Only Impact Earthwork Totals
N/A Shrinkage Factor 235 - Embankments III. C N/A N/A N/A 25 %
Page 4