SW1191201_Soils/Geotechnical Report_20210818

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TIMMONS GROUP
YOUR VISION ACHIEVED THROUGH OURS.
January 25, 2017
Frank Slinsky, P.E.
Timmons Group, Inc.
5410 Trinity Road
Suite 102
Raleigh, NC 27607
5410 Trinity Road P 919.866.4951
Suite 102 F 919.859.5663
Raleiqh, NC 27607 www.timmons.com
Re: Seasonal High Water Table Investigation for NCNG Readiness Center
Located off of Western Avenue, Morganton, Burke County, North Carolina
Mr. Slinksy:
At your request, Timmons Group, Inc., has completed an investigation of seasonal high water
table (SHWT) depth for the NCNG Readiness Center, located off of Western Avenue in
Morganton (PIN.- 2701118549). At your direction, this investigation was limited in scope to the
proposed stormwater BMP locations on the site, as illustrated on the attached drawing. The
investigation was completed on January 14, 2017.
Depth to SHWT was determined using accepted soil science practices. A hand auger was used to
advance vertically into the native soil until redoximorphic features (often mistakenly called
"mottles ") with a chroma of 2 or less were observed. True mottles that meet this color criterion
that are the result of parent material coloration are ignored, as these are not indicative of the
seasonal high water table.
Four hand auger borings were advanced in the locations proposed for the stormwater BMPs per
the drawing referenced above. In borings 1 and 3, chroma 2 redoximorphic features indicative of
the SHWT were not observed in the borings to a depth of 168 inches below the soil surface. In
boring 2, auger refusal was experienced at 118 inches below the soil surface. In boring 4, auger
refusal was experienced at 72 inches below the soil surface, The table below lists the observed
SHWT depths below the existing soil surface.
Boring ID
Auger Refusal
inches
SHWT Depth'
(inches)
SHWT Elevation
a,pproximato
1
N/A
> 168
< 1198.00
2
118
N/A
< 1222.17
3
N/A
> 168
< 1198.00
4
72
N/A
< 1216.00
Depth below existing soil surface
CIVIL ENGINEERING I ENVIRONIIIENTAL I SURVEYING I GIS I LANDSCAPE ARCHITECTLIRF j CONSTRUCTION SERVICES

Thank you for the opportunity to assist you with this seasonal high water table investigation for
this site. Do not hesitate to call me if you have any questions regarding this investigation or if
you need any additional information.
Sincerely, Z ' �'? ---SOIL
° I� .a �••',d`_� jl��}lam/ �V�
Scott Mitchell, PE, LSS Justin Milstein, SSIT
NC Environmental Practice Group Leader Environmental Scientist

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