22109211 Ellerbe Viper - Geotechnical Report.pdf
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- Attached to
- Ellerbe Tower Replacement and Civil Work
- Solicitation number
- Doc1198367293
- Issued by
- North Carolina
About this file
This document is a Geotechnical Report of Subsurface Investigation for the existing 340-ft guyed telecommunication tower at 176 Jimmy Carriker Road in Fountain, North Carolina. The report was prepared on August 3, 2022 for the North Carolina Highway Patrol, who is responsible for constructing and maintaining the statewide Voice Interoperability Plan for Emergency Responders (VIPER) network. The investigation included 7 soil borings performed on July 28, 2022 to evaluate the subsurface conditions and provide recommendations for analyzing the existing foundation system. The report details the soil types encountered, ultimate strength parameters, and recommended bearing capacities and passive pressures for the tower's foundation and anchor blocks. Groundwater was not encountered during the investigation.
The report provides the geotechnical engineering data and design parameters required to assess the existing tower's foundation. This information will support the NCSHP's project to replace the Ellerbe tower as part of the VIPER network. The report does not contain any pricing terms, funding sources, or other contractual details related to the tower replacement project.
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GEOTECHNICAL REPORT OF SUBSURFACE INVESTIGATION
August 3, 2022
EXISTING GUYED TOWER
ELLERBE - VIPER
HP-1085
176 Jimmy Carriker Road
Fountain, NC 28338
35.1201, -79.7107
Prepared for:
Prepared by:
Jorge Varela, P.E. Steven Allen
Registered NC 051545 Division Manager
Engineered Tower Solutions, PLLC - 3227 Wellington Court - Raleigh, NC 27615
(919) 782-2710
Geotechnical Report of Subsurface Investigation August 3, 2022
Ellerbe - Viper (HP-1085)
Job Number: 22109211
3227 Wellington Court, Raleigh, NC 27615 o) (919) 782-2710 www.ets-pllc.com
Project Summary
Item Description
Project Description
A geotechnical exploration and report have been prepared for this existing 340-ft guyed telecommunication tower. The results of the boring in addition to recommendations for analysis of the existing foundation system.
Site Coordinates Latitude: 35.1201 Longitude: -79.7107
Site Condition
The existing tower is located just south of the intersection between
Jimmy Carriker Road and Jones Spring Church Road in Fountain, NC.
The tower compound is currently covered with gravel and fenced.
Frost Depth
Based on the TIA Standard (TIA-222-H), dated October 2017, the recommended design frost penetration depth to be used for Pitt County, NC is 5 inches (0.4 ft).
Groundwater
Subsurface groundwater was not encountered at the time of drilling.
Please note that subsurface water levels will fluctuate with seasonal and cyclical temperatures and precipitation and can be higher or lower at other times.
Foundation Information
Reported by: Sabre Communications, January 15th, 1993
Pier Dimensions Diameter: 2 Feet
Length: 6.5 Feet
Pad Dimensions
Length: 7 Feet
Width: 7 Feet
Thickness: 1.5 Feet
Anchor Dimensions
Inner (L x W x H): 2.5 x 4.0 x 3.0 feet
Outer (L x W x H): 2.5 x 5.0 x 3.0 feet
Depth: 7.5 Feet
Field Exploration
Item Description
Date July 28th, 2022
Number of Borings 4
Location
Boring B-7 located 20 feet north of the existing tower. Borings B-1 through B-6 located in within 30 feet around the respectively anchor blocks.
Equipment Used CME-45
Advancement Method Hollow Stem Auger (HSA)
Sampling Method ASTM D-1586 with 2 O.D. Split Spoon Sampler
Laboratory Classification and Testing
Standard Description
ASTM D2488 Standard Practice for Description and Identification of Soils
Subsurface Profile
Based on the results of our borings, the soils beneath the surface can be summarized in the table below:
Material
Encountered
Approximate
Depth to Bottom of
Stratum (feet)
Description Consistency / Density
SAND 10 to 20 Fine to medium grained silty and clayey sand Loose to Dense
FAT CLAY 20
Medium plasticity with different amount of sand
Stiff to Very stiff
Detailed descriptions of conditions encountered at each exploration point are indicated on the individual logs in the Appendix B. Stratification boundaries on the boring logs represent the approximate location of changes in soil types; in-situ, the transition between materials may be gradual.
Groundwater was not encountered in any of the soil borings at the time of drilling. Groundwater levels will fluctuate with seasonal and climatic changes and may be different at other times.
Foundation Recommendations
The following recommendations are made based on our review of the test boring data our past experience with similar projects and subsurface conditions. Ultimate soil strength parameters are presented on table below.
Ultimate Strength Parameters
Boring # Depth
(ft)
Unified Soil or
Rock
Classification
Total Unit
Weight
(pcf)
Friction
Angle
(degrees)
Cohesion
(psf)
B-1
(Outer
Anchor)
0.0 – 2.0 SM 105 28 --
2.0 – 4.0 SM 105 28 --
4.0 – 8.0 SM 105 28 --
8.0 – 10.0 SM 105 28 --
10.0 – 20.0 SC 120 30 --
B-2
(Inner
Anchor)
0.0 – 2.0 SM 105 28 --
2.0 – 4.0 SM 105 28 --
4.0 – 8.0 SM 105 28 --
8.0 – 10.0 SM 105 28 --
10.0 – 20.0 SM 120 30 --
B-3
(Outer
Anchor)
0.0 – 2.0 SM 105 28 --
2.0 – 4.0 SM 105 29 --
4.0 – 8.0 SM 105 29 --
8.0 – 10.0 SM 115 30 --
10.0 – 20.0 CH 115 -- 2,100
Boring # Depth
(ft)
Unified Soil or
Rock
Classification
Total Unit
Weight
(pcf)
Friction
Angle
(degrees)
Cohesion
(psf)
B-4
(Inner
Anchor)
0.0 – 2.0 SM 105 28 --
2.0 – 4.0 SM 105 29 --
4.0 – 8.0 SM 105 29 --
8.0 – 15.0 SM 115 30 --
15.0 – 20.0 SC 125 30 --
B-5
(Outer
Anchor)
0.0 – 2.0 SM 105 28 --
2.0 – 4.0 SM 105 29 --
4.0 – 8.0 SM 105 29 --
8.0 – 10.0 SM 105 29 --
10.0 – 20.0 CH 115 -- 1,700
B-6
(Inner
Anchor)
0.0 – 2.0 SM 105 28 --
2.0 – 4.0 SM 105 28 --
4.0 – 8.0 SM 105 29 --
8.0 – 10.0 SM 105 29 --
10.0 – 20.0 SM 120 30 --
B-6
(Mast)
0.0 – 2.0 SM 105 28 --
2.0 – 4.0 SM 105 28 --
4.0 – 8.0 SM 105 29 --
8.0 – 10.0 SM 105 29 --
10.0 – 20.0 SM 115 30 --
1. Groundwater was not encountered in any of the borings
Job Number: 22109211
3227 Wellington Court, Raleigh, NC 27615 o) (919) 782-2710 www.ets-pllc.com
Pad & Pier
The tower’s capacity can be determined using the soil’s bearing capacity, passive pressure resistance, and sliding friction factor provided in the below tables
Net Ultimate Bearing Capacity and Sliding Friction Factor
Item Description
Net Ultimate Bearing Capacity1 3,500
Sliding Friction Factor 0.35
1. This value is an ultimate value and an appropriate factor of safety or resistance factor should be used
Ultimate Passive Pressure and Friction Factor
Boring # Depth
(ft)
Ultimate Passive Pressure
(psf)1
B-7
(Mast)
0.0 – 2.0 0 – 1,000
2.0 – 4.0 1,000 – 1,500
4.0 – 10.0 1,500 – 3,500
10.0 – 15.0 3,500 – 6,000
1. Ultimate passive pressure can be interpolated for foundation depths with the depth ranges given
Anchor Blocks
Concrete gravity blocks achieve resistance against the applied loads through the weight of the concrete in the blocks, the weight of the soil above the blocks, skin friction between the block and surrounding soil, and passive pressures developed in the soil. For these calculations we recommend the following values be used:
Job Number: 22109211
3227 Wellington Court, Raleigh, NC 27615 o) (919) 782-2710 www.ets-pllc.com
Ultimate Passive Pressure and Friction Factor
Boring # Depth
(ft)
Ultimate Passive Pressure
(psf) Sliding Friction Factor
B-1
(Outer
Anchor)
0.0 – 2.0 0 – 1,000
0.35
2.0 – 4.0 1,000 – 1,500
4.0 – 8.0 1,500 – 3,500
8.0 – 15.0 3,500 – 7,000
B-2
(Inner
Anchor)
0.0 – 2.0 0 – 1,000
0.35
2.0 – 8.0 1,000 – 1,500
8.0 – 10.0 1,500 – 3,500
10.0 – 15.0 3,500 – 7,000
B-3
(Outer
Anchor)
0.0 – 2.0 0 – 1,000
0.35 2.0 – 8.0 1,000 – 1,500
8.0 – 10.0 1,500 – 5,000
10.0 – 15.0 5,000 – 11,000 0.30
B-4
(Inner
Anchor)
0.0 – 2.0 0 – 1,000
0.35
2.0 – 8.0 1,000 – 1,500
8.0 – 10.0 1,500 – 3,500
10.0 – 15.0 3,500 – 7,500
B-5
(Outer
Anchor)
0.0 – 2.0 0 – 1,000
0.35 2.0 – 8.0 1,000 – 1,500
8.0 – 10.0 1,500 – 4,500
10.0 – 15.0 4,500 – 10,000 0.30
Job Number: 22109211
3227 Wellington Court, Raleigh, NC 27615 o) (919) 782-2710 www.ets-pllc.com
Boring # Depth
(ft)
Ultimate Passive Pressure
(psf) Sliding Friction Factor
B-6
(Inner
Anchor)
0.0 – 2.0 0 – 1,000
0.30
2.0 – 8.0 1,000 – 1,500
8.0 – 10.0 1,500 – 3,500
10.0 – 15.0 3,500 – 7,000
LIMITATIONS OF REPORT
This report has been prepared in accordance with generally accepted geotechnical engineering practices for the specific application of this project. The conclusions in this report are based on the applicable standards of our practice in this geographic area at the time this report was prepared.
No other warranty, expressed or implied, is made.
The analyses and conclusions submitted herein are based, in part, upon the data obtained from the subsurface exploration performed for this analysis. The soil and ground water conditions can vary across the site. Opinions and conclusions are subject to change if new or additional information is submitted for review.
APPENDIX A
LOCATION INFORMATION
SITE LOCATION PLAN August 3, 2022
BORING LOCATION PLAN August 3, 2022
SITE PHOTO August 3, 2022 http://www.ets-pllc.com/
APPENDIX B
SOIL TEST BORING
3-2-2 (4)
2-2-2 (4)
2-2-2 (4)
3-4-4 (8)
5-7-9 (16)
4-6-6 (12)
SS
#1
SS
#2
SS
#3
SS
#4
SS
#5
SS
#6
SILTY SAND (SM), fine to medium, brown and tan, moist, loose, CLAYEY SAND (SC), fine to medium, brown and orange, moist, medium dense, Bottom of borehole at 20.0 feet.
NOTES
GROUND WATER LEVELS:
AT TIME OF DRILLING --- Not Encountered
AT END OF DRILLING --- Not Encountered
AFTER DRILLING --- Not Encountered
LOGGED BY J. Varela
DRILLING METHOD Hollow Stem Auger (HSA)
DRILLING EQUIPMENT CME 45
DATE 7/28/2022 COORDINATES 35.120735, -79.71105
G R
A P
H
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B
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S (N
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P T
H (f t)
MATERIAL DESCRIPTION
BORING NUMBER B-1
PROJECT NAME Ellerbe - Viper (HP-1085)CLIENT North Carolina Highway Patrol
PROJECT NUMBER 22109211 PROJECT LOCATION 176 JImmy Carriker Road, Fountain, NC 28338
E T
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2-2-2
2-3-3 (6)
2-2-2 (4)
3-5-6 (11)
4-5-7 (12)
6-8-8 (16)
SS
#1
SS
#2
SS
#3
SS
#4
SS
#5
SS
#6
SILTY SAND (SM), fine to medium, brown and tan, moist, loose to medium dense, Bottom of borehole at 20.0 feet.
NOTES
GROUND WATER LEVELS:
AT TIME OF DRILLING --- Not Encountered
AT END OF DRILLING --- Not Encountered
AFTER DRILLING --- Not Encountered
LOGGED BY J. Varela
DRILLING METHOD Hollow Stem Auger (HSA)
DRILLING EQUIPMENT CME 45
DATE 7/28/2022 COORDINATES 35.120515, -79.710934
G R
A P
H
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MATERIAL DESCRIPTION
BORING NUMBER B-2
PROJECT NAME Ellerbe - Viper (HP-1085)CLIENT North Carolina Highway Patrol
PROJECT NUMBER 22109211 PROJECT LOCATION 176 JImmy Carriker Road, Fountain, NC 28338
E T
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1-2-1 (3)
2-2-3 (5)
3-3-3 (6)
4-5-6 (11)
7-8-13 (21)
6-9-13 (22)
SS
#1
SS
#2
SS
#3
SS
#4
SS
#5
SS
#6
SILTY SAND (SM), fine to medium, brown and tan, moist, loose to medium dense, SANDY FAT CLAY (CH), gray and orange, medium plasticity, moist, stiff, Bottom of borehole at 20.0 feet.
NOTES
GROUND WATER LEVELS:
AT TIME OF DRILLING --- Not Encountered
AT END OF DRILLING --- Not Encountered
AFTER DRILLING --- Not Encountered
LOGGED BY J. Varela
DRILLING METHOD Hollow Stem Auger (HSA)
DRILLING EQUIPMENT CME 45
DATE 7/28/2022 COORDINATES 35.120091, -79.709979
G R
A P
H
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MATERIAL DESCRIPTION
BORING NUMBER B-3
PROJECT NAME Ellerbe - Viper (HP-1085)CLIENT North Carolina Highway Patrol
PROJECT NUMBER 22109211 PROJECT LOCATION 176 JImmy Carriker Road, Fountain, NC 28338
E T
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2-2-3 (5)
4-3-3 (6)
3-4-6 (10)
4-5-7 (12)
11-16-17 (33)
SS
#1
SS
#2
SS
#3
SS
#4
SS
#5
SS
#6
SILTY SAND (SM), fine to medium, brown and tan, moist, loose to medium dense, CLAYEY SAND (SC), fine to medium, brown and orange, moist, dense, Bottom of borehole at 20.0 feet.
NOTES
GROUND WATER LEVELS:
AT TIME OF DRILLING --- Not Encountered
AT END OF DRILLING --- Not Encountered
AFTER DRILLING --- Not Encountered
LOGGED BY J. Varela
DRILLING METHOD Hollow Stem Auger (HSA)
DRILLING EQUIPMENT CME 45
DATE 7/28/2022 COORDINATES 35.120123, -79.71028
G R
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MATERIAL DESCRIPTION
BORING NUMBER B-4
PROJECT NAME Ellerbe - Viper (HP-1085)CLIENT North Carolina Highway Patrol
PROJECT NUMBER 22109211 PROJECT LOCATION 176 JImmy Carriker Road, Fountain, NC 28338
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1-1-1 (2)
2-3-2 (5)
3-3-2 (5)
4-4-4 (8)
7-7-10 (17)
8-9-9 (18)
SS
#1
SS
#2
SS
#3
SS
#4
SS
#5
SS
#6
SILTY SAND (SM), fine to medium, brown and tan, moist, loose, SANDY FAT CLAY (CH), gray and orange, medium plasticity, moist, very stiff, Bottom of borehole at 20.0 feet.
NOTES
GROUND WATER LEVELS:
AT TIME OF DRILLING --- Not Encountered
AT END OF DRILLING --- Not Encountered
AFTER DRILLING --- Not Encountered
LOGGED BY J. Varela
DRILLING METHOD Hollow Stem Auger (HSA)
DRILLING EQUIPMENT CME 45
DATE 7/28/2022 COORDINATES 35.119608, -79.711221
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MATERIAL DESCRIPTION
BORING NUMBER B-5
PROJECT NAME Ellerbe - Viper (HP-1085)CLIENT North Carolina Highway Patrol
PROJECT NUMBER 22109211 PROJECT LOCATION 176 JImmy Carriker Road, Fountain, NC 28338
E T
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1-1-2 (3)
2-3-2 (5)
3-3-3 (6)
4-5-6 (11)
10-9-11 (20)
SS
#1
SS
#2
SS
#3
SS
#4
SS
#5
SS
#6
SILTY SAND (SM), fine to medium, brown and tan, moist, very loose to loose, SILTY SAND (SM), fine to medium, brown and tan, moist, loose to medium dense, Bottom of borehole at 20.0 feet.
NOTES
GROUND WATER LEVELS:
AT TIME OF DRILLING --- Not Encountered
AT END OF DRILLING --- Not Encountered
AFTER DRILLING --- Not Encountered
LOGGED BY J. Varela
DRILLING METHOD Hollow Stem Auger (HSA)
DRILLING EQUIPMENT CME 45
DATE 7/28/2022 COORDINATES 35.11984, -79.711075
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BORING NUMBER B-6
PROJECT NAME Ellerbe - Viper (HP-1085)CLIENT North Carolina Highway Patrol
PROJECT NUMBER 22109211 PROJECT LOCATION 176 JImmy Carriker Road, Fountain, NC 28338
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3-2-2
2-1-2 (3)
1-2-3 (5)
3-3-4 (7)
5-6-8 (14)
4-4-5 (9)
SS
#1
SS
#2
SS
#3
SS
#4
SS
#5
SS
#6
SILTY SAND (SM), fine to medium, brown and tan, moist, very loose to loose, SILTY SAND (SM), fine to medium, brown and tan, moist, loose to medium dense, Bottom of borehole at 20.0 feet.
NOTES
GROUND WATER LEVELS:
AT TIME OF DRILLING --- Not Encountered
AT END OF DRILLING --- Not Encountered
AFTER DRILLING --- Not Encountered
LOGGED BY J. Varela
DRILLING METHOD Hollow Stem Auger (HSA)
DRILLING EQUIPMENT CME 45
DATE 7/28/2022 COORDINATES 35.120174, -79.710749
G R
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MATERIAL DESCRIPTION
BORING NUMBER B-7
PROJECT NAME Ellerbe - Viper (HP-1085)CLIENT North Carolina Highway Patrol
PROJECT NUMBER 22109211 PROJECT LOCATION 176 JImmy Carriker Road, Fountain, NC 28338
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