SW5240104_Soils/Geotechnical Report_20240206

S&
Soil & Environmental Consultants, PA
EC 8412 Falls of Neuse Road,Suite 104,Raleigh,NC 27615•Phone: [phone]• Fax: [phone]
sandec.com
FLM Engineering, Inc. December 4, 2023
Attn: Jon Frazier S&EC Job#15886.S1
PO Box 91727
Raleigh,NC 27675
Re: Detailed storm water soils evaluation for Green Hill Subdivision,NC Hwy 39, Louisburg,
NC
Dear Mr. Frazier:
Soil & Environmental Consultants, PA (S&EC)performed a detailed soil evaluation within
the targeted areas of the potential storm water control measures (SCM's) on the site
mentioned above. The purpose of this evaluation was to provide additional information for
the proper design of the proposed SCM's to treat the on-site storm water per 15A NCAC 02H
storm water rules. Soil morphological profile descriptions were performed at the specified
locations to determine depth to seasonal high water table (SHWT). The following is a brief
report of the methods utilized in this evaluation and the results obtained.
Soil/Site Evaluation Methodology
The site evaluation was performed by advancing hand auger borings to sufficient depth to
estimate SHWT. S&EC navigated to the pre-determined SCM locations to describe soil
morphological conditions using standard techniques outlined in the "Field Book for
Describing and Sampling Soils, Version 3"published by the Natural Resources Conservation
Service (NRCS, 2012). Borings were advanced in six locations. These locations are shown
on the enclosed soil boring location map.
Soil/Site Conditions
This site is located in the Piedmont geological area of Franklin County. The soils observed at
this site are similar to the Roanoke, Altavista, Helena, and Prosperity soil series. Roanoke
soils are poorly drained and have slow to very slow permeability. Altavista soils are
moderately well drained and have moderate permeability. Helena soils are moderately well
drained and have slow permeability. Prosperity soils are moderately well drained, have slow
permeability, and have a paralithic contact within 40 inches. Boring location SB-6 had mixed
fill over natural soil. Field investigation revealed SHWT indicators at boring locations at each
boring location, and an apparent water table was observed at SB-1 and SB-2. A summary of
the results for each boring is provided below, and detailed soil profile descriptions at each
boring location are provided in Attachment 1.

Table 1. Summary of SHWT depths
Soil Boring Location SHWT Depth below
ground surface (in)
SB-1 0
SB-2 42
SB-3 16
SB-4 8
SB-5 23
SB-6 52
At the time of the soils evaluation, the type of storm water devices were yet to be determined.
Each storm water device has different requirements with regard to in-situ soils. S&EC made
no attempt to measure soil saturated hydraulic conductivity(Ksat) in the underlying soil at this
time.
Soil & Environmental Consultants, PA is pleased to be of service in this matter and we look
forward to assisting in the successful completion of the project. If requested, S&EC can meet
on-site with state or local regulatory agencies to discuss our findings and recommendations.
Please feel free to call with any questions or comments.
Sincerely,
r Soil & Environmental Consultants, PA i.,r'' .:O 1 L. ,;,,`'..
•/ii.j. ::,)L)..4 . ,7,,,?.'s,-7,1, v-', i
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John Lewis !-.4'P kµ 1r.4
NC Licensed Soil Scientist#1345 ,� 1345 Q-0
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Encl: Boring Location Map
Attachment 1 —Soil Profile Descriptions
Page 2 of 4

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Project Number: Map Title: N
I 5886.5
Project Manager: Boring Location Map
Dw Green Hill Subdivision
Scale: Franklin County, NC
I " = 400' S&
Source: Soil& Environmental Consultants, PA
Date: NC OneMap EC
8412 Fells of Neuse Road,Sane 104,Raleigh,NC 37615•Phone:[phone]•Fax[phone]
I I / 17/23 Franklin Co. GIS ,endeccom

Attachment 1
Soil Profile Descriptions
SB-1: Roanoke soil series
Horizon Depth Matrix Texture Redoximorphic Other notes
(inches) Color Features
A 0—2 10YR 3/1 Silt Loam 5YR 5/6 Apparent water table
at 1"
Btg 2—24 10YR 4/1 Clay 5YR 5/6 Depleted matrix
SB-2: Altavista soil series
Horizon Depth Matrix Texture Redoximorphic Other notes
(inches) Color Features
Ap 0—5 10YR 4/3 Sandy Loam
Btl 5 —20 10YR 7/8 Sandy Clay
Loam
Bt2 20—42 10YR 5/6 Clay Loam
BC 42—50 10YR 5/6 Sandy Clay 10YR 7/1 Few,medium
Loam depletions
C 50—74 7.5YR 5/6 Sandy Loam 50%depleted matrix;
10YR 6/1 Auger refusal at 74",
buried rock;apparent
water table at 55"
SB-3: Helena soil series
Horizon Depth Matrix Texture Redoximorphic Other notes
(inches) Color Features
A 0—2 10YR 3/2 Sandy Loam
E 2— 16 10YR 6/4 Sandy Loam
Bt 16—22 10YR 5/8 Clay 10YR 5/1 Common,coarse
depletions; SHWT at
16"
BC 22—30 10YR 5/8 Clay Loam 10YR 6/1 Common,coarse
depletions
Cg 30—48 10YR 6/1 Sandy Clay Depleted matrix
Loam
Page 3 of 4

SB-4: Helena soil series
Horizon Depth Matrix Texture Redoximorphic Other notes
(inches) Color Features
Ap 0—8 10YR 3/2 Sandy Loam
Bt 8 —20 10YR 6/6 Clay 10YR 7/1 Common,coarse
depletions; SHWT at
8"
BC 20— 35 10YR 5/8 Clay Loam 10YR 7/1 Common,coarse
depletions
BCg 35 —48 10YR 7/1 Clay Loam Depleted matrix
SB-5: Prosperity soil series
Horizon Depth Matrix Texture Redoximorphic Other notes
(inches) Color Features
A 0—4 10YR 4/3 Sandy Loam
EB 4—23 10YR 6/4 Sandy Loam Gravelly
Bt 23 —38 10YR 6/8 Sandy Clay 10YR 7/1 Graveely;Common,
Loam coarse depletions;
SHWT at 23"
Cr Auger refusal at 38",
paralithic contact
SB-6: Mixed fill over natural soil
Horizon Depth Matrix Texture Redoximorphic Other notes
(inches) Color Features
Mixed fill 0—42 10YR 4/3 Sandy
10YR 5/2 Loam/Sandy
7.5YR 4/4 Clay Loam
Bt1 42—52 7.5YR 5/6 Sandy Clay
Loam
Bt2 52—66 7.5YR 5/8 Clay Loam 10YR 6/1 Common,coarse
depletions; SHWT at
52"
BC 66— 82 7.5YR 5/8 Sandy Clay 10YR 6/1 Common,coarse
Loam depletions
C 82— 108 10YR 5/4 Sandy Loam 10YR 6/1 Common,coarse
depletions;clay
lenses
Page 4 of 4