SW1230601_Soils/Geotechnical Report_20231030

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November 30, 2022
AVCON
10115 Kincey Avenue, Suite 140
Huntersville, North Carolina 28078
Attention: Mr. James Moose
Reference: Stormwater Soil Evaluation Report
AVL South Parking Lot
Fletcher, Buncombe County, North Carolina
S&ME Project No. 22410080
Dear Mr. Moose:
S&ME, Inc. (S&ME) has conducted a stormwater soil evaluation in general accordance with S&ME
Proposal No. 22410080 dated July 21, 2022. Our evaluation was conducted to provide information for the
design of a Stormwater Control Measure (SCM) and a Stormwater Management Permit Application to the
North Carolina Department of Environmental Quality (NCDEQ)— Division of Energy, Minerals, & Land
Resources (DEMLR) and/or local delegated authority.A soil scientist evaluated the soil conditions within
the proposed SCM location on November 22, 2022.
Background Information
We understand that a new parking area is to be constructed at the south end of the existing Asheville
Regional Airport property. This proposed parking area is bordered to the north by a Marathon Gas
Station, to the east by Airport Road, and to the south and west is Rental Car Road and the rental car
storage and maintenance area.The total site area is about 15.5 acres and is wooded with a drainage
feature along the western side of the site and crossing the site near the southern end. A roadway was
cleared through the western side of the site and mostly follows along the eastern side of the drainage
feature. Based on the Buncombe County GIS site, an existing 8-inch MSD sewer line extends along this
roadway.The site generally slopes upward from a low elevation of approximately 2080 feet along the
western side along the drainage feature to a high elevation of 2100 feet along the eastern side.
We understand the proposed development will include an asphalt parking area accessed from Rental Car
Road to the west.We anticipate the access will include a culvert across the existing drainage feature. The
enclosed Figure 1 and Figure 2 depict the site boundary and requested hand auger boring locations on a
US Department of Agriculture (USDA) Natural Resource Conservation Service (NRCS) Buncombe County
soil survey exhibit and US Geologic Survey (USGS) topographic exhibit respectively.
According to Figure 1, the soils in the vicinity of the proposed SCMs are mapped as the Tate-Urban Land
complex and the Clifton-Urban Land complex. These areas are covered by buildings, houses, streets,
parking lots, and other such urban uses. Because of the extensive urbanization, natural soils have been
S&ME, Inc.13201 Spring Forest Road I Raleigh, NC 276161 p 919.872.2660 I f 919.876.3958I www.smeinc.com

Stormwater Soil Evaluation Report
AVL South Parking Lot
Fletcher, Buncombe County, North Carolina I I I
S&ME Project No. 22410080
altered by activities such as excavation, grading, and filling and as a result the topography and original
landscape have been changed. In general, the Tate series consists of very deep, well drained, moderately
permeable soils on benches, fans, and toe slopes in coves in the Blue Ridge that formed in colluvium
weathered from felsic to mafic high-grade metamorphic rocks.The Clifton series consists of very deep,
well drained, moderate permeability soils on ridges and side slopes of the Blue Ridge that formed in
residuum weathered from intermediate and mafic igneous and high-grade metamorphic rocks that are
high in ferromagnesium minerals.
A total of four hand auger borings were requested, two in the proposed wet detention basin SCM, and
two in the alternative bioretention type SCM location as shown on the attached Stormwater Soil
Evaluation Exhibit (Figure 3). S&ME performed a hand auger boring at the requested location and at an
alternate location due to encountering rock and auger refusal at the first location. The hand auger borings
were performed in order to identify the soil morphological conditions, develop soil profile descriptions,
estimate the SHWT, and measure the observed water table (OWT) and depth to auger refusal if applicable.
The maximum practical depth of hand auger boring exploration on this site was limited to approximately
10 feet below existing grade.
Findings
SHWT Estimation, OWT Measurement, and Depth to Auger Refusal
S&ME estimated the SHWT by advancing hand auger borings at the four locations shown on the attached
Figure 3 and evaluating the soil for evidence of SHWT influence. This evaluation involved looking at the
soil to assess soil moisture, matrix and mottle colors. Depending on the soil texture, the soil color will
indicate processes that are driven by SHWT fluctuations, such as iron reduction and oxidation and organic
matter staining.
In addition, S&ME recorded the depth that the OWT was encountered below existing ground surface
(EGS) at each soil boring location if applicable. The OWT was measured as the static water level in each of
the temporary hand auger boring locations. It should be noted that the static water level/OWT measured
in the auger holes is a measurement of the water table at that moment and does not represent an
average water level or the highest point at which the water table may rise to. Furthermore, it is expected
that groundwater elevations in the study area will likely be influenced by factors such as precipitation and
proximity to surface water discharge/recharge features.
See Table 1 below and Figure 3 for the estimated depth to SHWT, and measured depth to the OWT and
auger refusal if applicable. Site and soil photographs are included in Appendix I.
November 30, 2022 2

Stormwater Soil Evaluation Report
AVL South Parking Lot
Fletcher, Buncombe County, North Carolina I I
S&ME Project No. 22410080
Table 1
HAND SEASONAL HIGH WATER OBSERVED WATER AUGER REFUSAL
AUGER TABLE(SHWT) DEPTH TABLE(OWT)DEPTH DEPTH
BORING (inches/feet below ground (inches/feet below ground (inches/feet below ground
LOCATION surface) surface) surface)
SW-1 20/ 1.7 >48/ >4.0 >48/ >4.0
SW-2 58/4.8 >60/ >5.0 >60/ >5.0
SW-3 52/4.3 >60/ >5.0 >60/ >5.0
SW-4 20/ 1.7 40/3.3 >48/ >4.0
Permeability/Hydraulic Conductivity Estimation
The soil profile descriptions on the attached Figure 3 show the soil morphological conditions including
soil texture, structure, soil matrix and mottle color, estimated United States Department of Agriculture
(USDA) permeability and estimated USDA hydraulic conductivity(Ksat) for the different soil horizons
found on-site.
Please refer to the enclosed map and soil profile descriptions for more information. These estimates were
obtained from one or more of the following: Buncombe County Soil Survey"Physical &Chemical
Properties of the Soil - Permeability"; and/or USDA-NRCS (United States Department of Agriculture -
Natural Resource Conservation Service) official series description, and/or"NRCS Field Book for Describing
&Sampling Soils".The permeability estimates were converted to conductivity on the profile description
tables.
Data presented in this report are based on materials encountered at the hand auger boring locations only.
Conditions may vary between hand auger boring locations and in other areas of the proposed SCMs. The
reported depths are based upon the ground surface locations of the borings at the time of our evaluation.
Application of Findings
Data presented in this report are based on materials encountered at the hand auger boring locations only.
Conditions may vary between hand auger boring locations and in other areas of the proposed SCMs. The
reported depths are based upon the ground surface locations of the borings at the time of our evaluation.
Please note that changes in site grade or SCM location may make the chosen stormwater management
systems inappropriate or make other stormwater management systems more appropriate. Significant
SCM location or grade changes relative to the grade at the time of exploration may require additional
exploration for SCM design.
November 30, 2022 3

Stormwater Soil Evaluation Report
AVL South Parking Lot
Fletcher, Buncombe County, North Carolina I I
S&ME Project No. 22410080
Closing
S&ME appreciates the opportunity to provide stormwater soil evaluation services for this project. If you
have any questions or would like to discuss applicable stormwater management systems, please contact
Walter Cole at 919-872-2660 or [e-mail].
Sincerely,
S&ME, Inc.
0) son sc
2�i `N p L T FR s
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NORTH GP
Walter Cole, LSS, REHS Thomas P. Raymond, PE
Senior Project Manager Environmental Area Manager
Enclosed: Figure 1: USDA-NRCS Buncombe County Soil Survey Exhibit
Figure 2: USGS Topographic Exhibit
Figure 3: Stormwater Soil Evaluation Exhibit
Appendix I: Site Photographs
November 30, 2022 4

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GIS BASE LAYERS WERE OBTAINED FROM USDA-NRCS SOIL SURVEY AREA NCO21 r'~ 1' ® Hand Auger Boring Location
'- GEOEDATABASE AND THE 2019 NCONEMAP AERIAL ORTHOIMAGERY LAYER. THIS MAP IS
Y FOR INFORMATIONAL PURPOSES ONLY. ALL FEATURE LOCATIONS DISPLAYED ARE •�� = Proposed SCM
E APPROXIMATED.THEY ARE NOT BASED ON CIVIL SURVEY INFORMATION,UNLESS STATED F Soil Map Unit
OTHERWISE.
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SCALE: FIGURE NO.
iII USDA-NRCS SOIL SURVEY EXHIBIT 1 " = 200 '
DATE:
I I -- ASHEVILLE REGIONAL AIRPORT - SOUTH PARKING AREA 11-29-22 1
TERMINAL DRIVE PROJECT NUMBER
FLETCHER, BUNCOMBE COUNTY, NORTH CAROLINA 22410080

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ij GIS BASE LAYERS WERE OBTAINED FROM USGS NATIONAL TOPO MAP VIEWER. THIS MAP
I- IS FOR INFORMATIONAL PURPOSES ONLY. ALL FEATURE LOCATIONS DISPLAYED ARE •
a APPROXIMATED.THEY ARE NOT BASED ON CIVIL SURVEY INFORMATION,UNLESS STATED ® Hand Auger Boring Location
m OTHERWISE.
. = Proposed SCM
SCALE: FIGURE NO.
iiI USGS TOPOGRAPHIC EXHIBIT 1 " = 500 '
DATE:
I I -- ASHEVILLE REGIONAL AIRPORT - SOUTH PARKING AREA 11-29-22 2
TERMINAL DRIVE PROJECT NUMBER
\ FLETCHER, BUNCOMBE COUNTY, NORTH CAROLINA 22410080 J

1
Soil Profile Descriptions b 1�, �, 1 r� i �1,I 1,1' + �� Na
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Boring SW-1 1li_'411
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\ reJ'' G''S&ME Project Number:22410080 Borin Date:November 22,2022 Landsca a Position:Foot Sloe ' 'tEl Color ' USDA USDA 1 • 1,^ r I II1 IIIEstimated Estimated '. ` - 1 t V. //''��IIIIIII r _�Depth Moist Permeability Conductivity 4 ', 11 {_ + (,'`� II�,I,�,1�11 .r I I II II4Horizon (in) (Matrix) (Mottles) Texture Grade Structure Consistence Notes (in/hr) (in/hr) 1 , �}� 1l �l.i U I I I I 1` ` I 11A 0-3 10YR 3/2 loam weak granular very friable 2-6 1.4-14 •
1, 1 1% .11 `I ` I 1�'I I 1subangular ` ��''� r ', If' � ..,' II I I I Ii i 1 I l i t l l l� ,11 11 I.Bt1 3-20 10YR4/3 10YR 5/6 clay loam weak friable 0.6-2 0.14-1.4 1 ll1 fp-
subangular ' '�� dl 'S ( t `etg1 20-34 10YR 5/1 10YR 5/6 clay loam weak blocky friable 0.6-2 0.14-1.4 11 \11A a ,'V• 1 I1II11 I1I1I11 I11 (I I 1 I it
iiBtg2 34-40 10YR 6/1 10YR 6/6 clay weak subockyar firm-very firm 0.06-0.2 0.014-0.14 1, , 1 �,�', H 1� I t i1 1 I1 11 11 11`I ,1expansive clay 1, A',� yI 111 11iY111I Btg3 40-48+ 10YR 7/1 10YR 5/8 clay massive very firm 0.06-0.2 0.014-0.14 1 `1 't *�� I �(
mineralogy b 1 1; 1 fEstimated SHWT depth from EGS: 20 inches (1.7 feet) 1, 1 �,,�1 4 1I1
Measured OWT depth from EGS: >48 inches (>4.0 feet) ` 1�t'1; rDepth to auger refusal: >48 inches (>4.0 feet) 1 = Iq I l i
Boring SW-2 ,, �, l:, t, N�/1114 I.1I{I 1 1 ;� I I E+
' 1:--------
'. 11 hI It: I II{ I I 1,� E l Q
41 1Boring LandscapeUSDA USDA 1, b ,� %` lfr 1 h�'li l`,,,( t� I I I�1 11� 1 �' I I 0 Z
N S&ME Project Number:22410080 Date:November 22,2022 Position:Side Slope 1 . n -H <
Color 1, S � _ [
Estimated Estimated 1� �� V' 1' �� 1' Q [)
Depth Moist Permeability Conductivity 1, i �'Iili I' , i '� Z
I 1 I 1�{ i s7ffRHRI W
N• Horizon (in) (Matrix) (Mottles) Texture Grade Structure Consistence Notes (in/hr) (in/hr) 1 \ �t} ; {II 11 G� 1 I r �j
A 0-2 10YR 3/2 loam weak granular very friable 2-6 1.4-14 _ `, \ %i ,' ,,�`'�i, i�AI �+n i ii!, I fd _
subangular 1 r V'41.1111E( j
ct
4 BA 2-12 10YR 4/4 loam weak blocky very friable 2-6 1.4-14 1, 1 tt 1 , t.y = I-
1 t I V aWilita r t E-I
subangular 1, 1 �.� t , l O I- O
Bt1 12-28 10YR 5/4 clay loam weak friable 0.6-2 0.14-1.4 . 1 I •o bloc .� 7� tl� ^ I -"� -•r w Z
at subang tar 1, 1 i ,'il i ',II I Cl) - O >
-a Bt2 28-46 10YR 5/6 clay loam weak friable 0.6-2 0.14-1.4 jr! 'I ` [n }'
E subangular 1 , 1,,, ,�s '• �� ' 1 I� 0'
Bt3 46-52 10YR 5/6 clay weak blockyg firm 0.06-0.2 0.014-0.14 1 I 1 1.y�.�` E`.1 I \ 1- 1 Z
I SW 3 milli
`1r'71'T1'1�I1'
3 subangular _ r ,� �T r 1 ,1
jl r 11 11 1' t' J i W QBt4 52-56 10YR5/6 2.5YR4/8 clay weak blockyfirmveryfirm0.06-0.2 0.014-0.14 ,., 2/ '� 1 ", I Id Z0 10YR6/6 angular , t 1 __ wI • BC 56-60+ 10YR 7/1 clay weak very firm 0.06-0.2 0.014-0.14 y. ,vo0, .e'.• ` cD
2.SYR6/4 bocky ��1 ,��r�� �� < <� � � ''• I I O/ • 0 Q
rtL�'vEstimated SMKT depth from EGS: 58 inches (4.8 feet) 1 ;r; 0 i�t I . dl ` _i 2
"t i i 11 11Measured OWT de• pth from EGS: >60 inches (>5.0 feet) ! 6 d' 'ii !• III1 � I VI �� `t' ;j 1 Q Z O
o . Depth to auger refusal: >60 inches (>5.0 feet) \ `` �,/
b O'er '� • ITV I 'l f I�~ D
iE �Po" �1Z-5\"�- :4( 01 1 'I� III Z l"' Z
Boring SW-3 -, QI ! m
w CY w
w 1 ,,�w' E.I
b b ,10 I + i.1 f . 1 I w w
HIM
z S&ME Project Number:22410080 Boring Date:November 22,2022 Landscape Position:Foot Slope n,,,,, } ) - 1 J =
Color USDA USDA ''J" I I ' E-
a 1 'll';1 I I w 1-
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Estimated Estimated , y "� 11, �,,:H„1`. I++ t J
f Depth Moist Permeability Conductivity . G' b4 ,, 'v' ;!I ,i O L.L
Horizon (in) (Matrix) (Mottles) Texture Grade Structure Consistence Notes (in/hr) (in/hr) ♦ 1, �,,,.. _ t I,,, E-t Q
A 0-3 10YR4/3 loam weak granular very friable 2-6 1.4-14 b H, le+ ,rs I 1-1 I
;. 1 L
subangular #' �NY, ., , .7 14 1 •
r
Bt1 3-8 10YR 5/4 10YR 5/6 clay loam weak friable 0.6-2 0.14-1.4
blocky ! I
subangular > b b 1'i"
y 'ally 1 r..- I\
o Bt2 8-32 10YR 5/4 10YR 5/6 clay loam weak blocky friable 0.6-2 0.14-1.4 + \ {t y/ �-- I
o- subangular r �' i --'
Bt3 32-40 10YR 6/4 7.5YR 6/6 clay weak blocky firm-very firm - 0.06-0.2 0.014-0.14 b 4�„Y,, 1 ; II'Y II'1JI + 1
7.5YR 6/6 subangular x 1' ' TlT7TT1
o Bt4 40-52 10YR 6/4 clay weak firm-very firm 0.06-0.2 0.014-0.14 ,�y"y`�� .\
UUU III 111 111 II'VVV E9 /�
a, 10YR5/3 blocky _ �„"�r,R ` �`e ' '1`t 1 /
10YR 7/1 expansive clay _ _�
d Bt5 52-60+ 2.5R 5/3 clay massive very firm 0.06-0.2 0.014-0.14 - b b ► ` i ,
7.5YR 5/6 mineralogy �y ► b - \rS ` 1 t \
,, Estimated SHIM"depth from EGS: 52 inches (4.3 feet) 00 ► V �1 1
t:.
"2 Measured OWT depth from EGS: >60 inches (>5.0 feet) b b b �) , I`'�
Depth to auger refusal: >60 inches (>5.0 feet) ' Y n 1L,_ '1 R2P R
Boring SW-4 \ # • y, ,. -4 ./ K_ / ``r i i� 1. , SCALE:
r, S&ME Project Number:22410080 Boring Date:November 22,2022 Landscape Position:Toe Sloe • b b e t -
N l 9 P P 0 150.- 300 ] Mn `: f"I'
Color USDA USDA 1• , k�, ;�'� y 1� t
it DATE:o Estimated Estimated 'y41\ (FEET)] J// °:`_ 1 1 11-29-22
ATE:Depth Moist Permeability Conductivity % b /'� b / n ,�%;,Lk �' 1 + J -
. Horizon (in) (Matrix) (Mottles) Texture Grade Structure Consistence Notes (in/hr) (in/hr) / � ,
o e 11 I. PROJECT NUMBER
A 0-4 10YR loam weak granular very friable 2-6 1.4-14 % REFERENCE: t! I a CM I I
6 c 4-20 10YR5/8 10YR5/6 loam massive very friable saprolite 0.6-2 0.14-1.4 GIS BASE LAYERS WERE OBTAINED FROM THE 2019 NCONEMAP AERIAL ORTHOIMAGERY , + I ;; ;j { 22410080
Cg1 20-30 10YR5/1 10YR4/3 clay loam massive friable saprolite 0.6-2 0.14-1.4 LAYER AND ALTERNATIVE 2 PLAN FOR THEASHEVILLEREGIONALAIRPORTSOUTHERN ', 1 __ __y
s PARKING AREA,SHEET EX-02 AND DATED NOVEMBER 2022. THIS MAP IS FOR e4f -z'► i FIGURE NO.
d Cg2 30-48+ 5Y 5/1 10YR4/4 clay loam massive friable saprolite 0.6-2 0.14-1.4 INFORMATIONAL PURPOSES ONLY. ALL FEATURE LOCATIONS DISPLAYED ARE '/ ,,, ' .li ,�rew! 1� '
Estimated SHWT depth from EGS: 20 inches (1.7feet) APPROXIMATED.THEY ARE NOT BASED ON CIVIL SURVEY INFORMATION,UNLESS STATED t` a o , n' ® Hand Auger Boring Location 9 r
0 Measured OWi depth from EGS: 40 inches (3.3 feet) a OTHERWISE. / I ,., I t I,r 3
Depth to auger refusal: >48 inches (>4.0 feet) 1 i,, , 4,r, �l ,,1' 'I 1 � Proposed SCM
W '`-, i rF x it " x /i 1 ,1 I r. �r s.,, \,� / V 1I - \-) 1. I I

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• 1A,16` 1 v ' 4 II* 48 04ig F . ,
I. ' , ., n•vie.,,.. - :‘'.:tv..-.., ...- .,.7-1,":-...„-', 4 ,, ,,/,. , • •••. ll•..ii,
1 iew of redoximorphic (low chroma depletions and high 2 iew of redoximorphic (low chroma depletions and high
chroma oxidation) soil conditions indicative of the SHWT chroma oxidation) soil conditions indicative of the SHWT
at hand au•er borin• location SW-1 at 20 inches. at hand au•er borin• location SW-2 at 58 inches.
" ♦ ..,-a
\ • v r j
�11(L ti> i !� `�a 1A ottt, ' i .�!s,i
• It
•~ ,V •tV -�'.1.c. .^ f. •1 d ,7� C K r� \. .. v _ ,,...Y ''ti ' � ''f t 1.
7Y •
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Iiew of redoximorphic (low chroma depletions and high 4 iew of redoximorphic (low chroma depletions and high
chroma oxidation) soil conditions indicative of the SHWT chroma oxidation) soil conditions indicative of the SHWT
at hand au•er borin• location SW-3 at 52 inches. at hand au•er borin• location SW-4 at 20 inches.
=� Asheville Regional Airport South Parking Lot Site Photographs S&ME Project No. 22410080
I . Terminal Road, Fletcher, Buncombe County, North Carolina Taken by:W. Cole I Date Taken: 11/22/22
1