SW6210201_Ryans Run_SHWT Report_20210416

Scott Cole, NCLSS
312 Copples Road Ext
Asheboro, NC 27205
[phone]
Double D Engineering, PLLC
Attn: Mr. Lee Humphrey
150 S. Page Street
Southern Pines, NC 28387
April 7, 2021
Re: Seasonal High -Water Table Identification and Soil Infiltration Rates: Ryans Run; Hoke County NC
Calloway Road
Soil conditions and infiltration rates were evaluated and measured on the above -referenced property
within the proposed storm water BMP devices. Work was conducted in accordance with Parts A-2 and C-
1 of the North Carolina Department of Environmental Quality Stormwater Design Manual. Soil samples
were evaluated with a hand auger.
SEASONAL HIGH WATER TABLE IDENTIFICATION
Seasonal High Water Table depth is determined by field evaluation for soil wetness conditions which are
indicated by the presence of redoximorphic (redox) features with a chroma of 2 or less (in Munsell color
notation) in mottles or the horizon matrix. Colors of chroma 2 or less due to relic minerals from parent
material (underlying rock), anaerobic activity created by placement of fill material, or soil textural class
transitions (perched water) are not considered as indicators for seasonal high water. Upon determination
of SHWT depth, an additional 6" will be deducted from the observed depth to account for capillary fringe
water movement above the SHWT. Stormwater infiltration trenches are designed to ensure the lowest
point is at least two feet above the Seasonal High Water Table (SHWT).
SATURATED HYDRAULIC CONDUCTIVITY (K ,t)
Soils evaluated on this property are typical of those within the Blaney Loamy Sand series (BaB, BaD) and
the Vaucluse Loamy Sand series (VaB). These soil series consist of deep, well drained soils with varying
rates of permeability. Infiltration rates were measured to determine if soil conditions were suitable for the
installation of stormwater infiltration trenches. Infiltration rates were measured using a Johnson Constant
Head Permeameter. Measurements were recorded at varying intervals until equilibrium was reached.
A summary of observations within the proposed Stormwater BMP Device is shown in the table below.
BMP Device Site #1
SHWT
Munsell Color
Ksat
I�at
&at
(inches below
Notation
(0-30"; SL)
(30-48"; SCL)
(48-96"; SCL/SC
ground surface
mixed mineralogy)
with capillary
fringe ad'ustment
90" (7.5') (SHWT
2.5Y 8/1
18" / hour
.8" / hour
Not Measured
elevation 292.5')
2.5Y 7/1

Scott Cole, NCLSS
312 Copples Road Ext
Asheboro, NC 27205
[phone]
BMP Device Site 42
SHWT
Munsell Color
Ksa,
Ksat
&at
finches below
Notation
(0-4`8"; SL)
(48-80"; SCL)
(80-100'; SCL/SC
ground surface
mixed mineralogy)
with capillary
Erin a adins tment
96" (8') (SHWT
2.5Y 8/1
18" / hour
.8" / hour
Not Measured
elevation 300')
2.5Y 7/1
CONCLUSION
Field evaluation of hydraulic conductivity provides estimations of soil infiltration rates; however,
methods used to measure these rates can influence the results. Side walls of the bore hole are "smeared"
by the soil auger as the hole is prepared and loose soil in the bottom of the hole is placed in suspension
when water is applied; both factors negatively influence water infiltration rates. To help overcome these
issues, after excavation of each infiltration trench, it is recommended the trench bottom and sidewalls be
raked and dusted with pulverized limestone. These are practices that have been in place within the on -site
wastewater industry to help loosen the soil and aid in restoration of soil structure.
I am pleased to be of service in this matter and can be contacted at your convenience should you have any
questions concerning information within this report.
Thank you,
C_ QQ� —2
Scott Cole
North Carolina Licensed Soil Scientist
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Ksat 0-48" SL: 18" / hour
Ksat 48-80.' SCL: .8" / hour
Ksat 80-100" SCL mixed min: Not Measured
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