SW3170305_Stormwater Report_20170510

SUMMIT
ENGINEERING. LABORATORY. TESTING
April 26, 2017
Jeff Reasner
Dependable Development, Inc.
2627 Breckenridge Centre Dr.
Monroe, North Carolina 28110
Email: jreasnerktruehomesusa.com
Subject: Estimated Seasonal High Water Table (ESHWT) Determinations
Larkin Multi -Family
Fox Den Circle & 101h Green Street
Charlotte, North Carolina
SUMMIT Project No. 4280.504
Dear Mr. Reasner:
SUMMIT Engineering, Laboratory and Testing, P.C. (SUMMIT) is pleased to submit this
letter summarizing our findings within Borings B-1, B-2 and B-3 with regards to the
Estimated Seasonal High Water Table Elevation (ESHWT) determination. Boring B-1 was
performed at the location of the proposed pond to be constructed at the subject site. This
report contains a brief description of the project information provided to us, general site and
subsurface conditions revealed during the exploration.
PURPOSE OF STUDY
The purpose of this study was to obtain information regarding the subsurface conditions
within the proposed stormwater BMP ponds and determine the estimated seasonal high water
table mark (if evident). This report contains the following items:
• Photographic Logs, Site Vicinity Map and Test Boring Location Plan,
• Summary of Test Boring Observations, visual soil classifications and descriptions,
and laboratory results,
• A general review of the subsurface soils and estimated seasonal high water table
depth from existing ground surface (if evident),
• Groundwater level measurements.

Summary of ESHWT Determination SUMMIT Project Number 4280.504
Larkin Multi -family, Statesville, North Carolina April 26, 2017
EXPLORATION PROCEDURES
On April 20, 2017, SUMMIT visited the site and performed a soil test boring within the
proposed stormwater BMP ponds. The approximate locations of the boring (identified as B-1
thru B-3) are shown on "Figure 2, Boring Location Plan" provided in Appendix 2. The client
(Galaxy NC LLC) provided SUMMIT with a "Grading Plan" prepared by R. Joe Harris &
Associates, Inc. dated February 3, 2017 and showed the approximate location of each of the
proposed stormwater BMP ponds. The test locations were staked in the field by a
representative from R. Joe Harris & Associates, Inc.
The soil test boring was performed using an ATV -mounted CME 550X drill rig. The boring
was extended to a depth of about 20 feet below the existing ground surface. Hollow -stem,
continuous flight auger drilling techniques were used to advance the borings deeper into the
ground. Standard Penetration Tests (SPT) were performed within the mechanical borings at
designated intervals in general accordance with ASTM D 1586 to obtain a soil sample for
visual classification in general accordance with ASTM D-2488. Water level measurements
were attempted at the termination of drilling and at 24 hours after the completion of drilling.
The classification symbols are depicted on the "Boring Log" provided in Appendix 3.
GENERALIZED SUBSURFACE STRATIGRAPHY
General subsurface conditions observed during our geotechnical exploration are described
herein. For more detailed soil descriptions and stratifications at a particular test location, the
respective "Boring Log" provided in Appendix 3 should be reviewed. The horizontal
stratification lines designating the interface between various strata represent approximate
boundaries. Transitions between different strata in the field may be gradual in both the
horizontal and vertical directions.
Beginning from the ground surface, a veneer of topsoil (surficial organic soils)
approximately 4 to 6 inches in thickness was observed. Residuum (undisturbed natural soil)
was encountered below the surficial soils and extended to maximum boring termination
depth of 20 feet below the existing ground surface. Residual soils consist of loose to medium
dense silty sands (SM), stiff sandy silts (ML), and firm to stiff lean clays (CL). Standard
penetration testing (SPT) within the residual soils exhibited N -Values ranging from 6 to 14
blows per foot.

Summary of ESHWT Determination SUMMIT Project Number 4280.504
Larkin Multi -family, Statesville, North Carolina April 26, 2017
GROUNDWATER LEVEL MEASUREMENTS
Groundwater was not observed either at time of drilling (ATD) or at 24 hours after the
completion of drilling.
ESTIMATED SEASONAL HIGH WATER TABLE
The ESHWT is defined as a change in the color of the soil layer due to water staining
(typically, gray redoximorphic depletions and mottling). "Spotting" or "blotching" of
different colors or shades of colors are interspersed with one dominant color within the soil
matrix and is commonly referred to as "mottling." Mottling is caused by intermittent periods
of saturation and drying, and may be indicative of poor aeration and drainage. Mottling is a
historically recognized "general indication of groundwater" flow through a soil layer.
However, in some instances it can be difficult to determine if said groundwater flow was
recent.
The above referenced Estimated Seasonal High Water Table (ESHWT) indicators were not
observed within the depths sampled in borings B-1, B-2, and B-3.
The following table summarizes the boring sampled depths, existing ground elevations, the
approximate depths and elevations of the ESHWTs, the approximate depths of groundwater
(GW) at time of drilling (ATD), and groundwater (GW) after 24 hours.
Summary Table of the Boring Depth, Existing Ground Elevation,
ESHWT Depth and Elevation, and Groundwater Depths
' Depths from existing ground surface.
2 Existing ground elevation was provided by R. Joe Harris & Associates, Inc.
MSL — Above Mean Sea Level
NE — Not Encountered
Groundwater
Boring
Boring
Ground
ESHWT
ESHWT
Depths
ID
Depth
Elev.
Depth
Elev.
(Ft)'
(MSL)2
(Ft)'
(MSL)
ATD
24 Hours
(Ft)
(Ft)'
B-1
20
855.22
NE
NE
NE
NE
B-2
20
866.13
NE
NE
NE
NE
B-3
20
873.72
NE
NE
NE
NE
' Depths from existing ground surface.
2 Existing ground elevation was provided by R. Joe Harris & Associates, Inc.
MSL — Above Mean Sea Level
NE — Not Encountered

Summary of ESHWT Determination SUMMIT Project Number 4280.504
Larkin Multi -family, Statesville, North Carolina April 26, 2017
CLOSING
SUMMIT appreciates the opportunity to provide our professional services for you on this
project. If you have any questions concerning the information in this proposal or if we may be
of further service, please contact us at 704.504.1717.
Sincerely,
SUMMIT
If 1/
6",
Robert �11''i�t�@n8� \VV E.
Geotechnicaff l tblfct Manaa
LIST OF APPENDICES
1
2
` ............ ......
f•SUMMIT .,�'� 5
�1� r Engineering,
6 C) Testin Laboratory
C. u1
Tri 9 =�
C-4361 �� 1�
TE of
er '/11rr11100�
Photographic Log
Figure No. 1 — Site Vicinity Map
Figure No. 2 — Test Boring Location Plan
3 Boring Logs
Robert L. Price, P.E.
Senior Geotechnical Engineer

Summary of ESHWT Determination SUMMIT Project Number 4280.504
Larkin Multi -family, Statesville, North Carolina April 26, 2017
SUMMIT
ENGINEERING . LABORATORY + TESTING
APPENDIX 1.
PHOTOGRAPHIC LOG

Summary of ESHWT Determination SUMMIT Project Number 4280.504
Larkin Multi -family, Statesville, North Carolina April 26, 2017
OF
- _
NOW
Photo 1: Boring B -I from Oft. to 10 ft.
----------
Photo-----
Photo 2: Boring B-1 from 10 ft. to 20 ft.

Summary of ESHWT Determination SUMMIT Project Number 4280.504
Larkin Multi -family, Statesville, North Carolina April 26, 2017
Photo 3: Boring B-2 from Oft. to ]Oft.
Photo 4: Boring B-2 from 10 ft. to 20 ft.

Summary of ESHWT Determination SUMMIT Project Number 4280.504
Larkin Multi -family, Statesville, North Carolina April 26, 2017
Photo 5: Boring B-3 from Oft. to 10 ft.
Photo 6: Boring B-3 from 10 ft. to 20 ft.

Summary of ESHWT Determination SUMMIT Project Number 4280.504
Larkin Multi -family, Statesville, North Carolina April 26, 2017
SUMMIT
ENGINEERING * L► 50RATORY o TESTING
APPENDIX 2
Figures

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SUMMIT
ENGINEERING, LABORATORY & TESTING, P.C.
-NOT TO SCALE -
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FIGURE I
SITE VICINITY MAP
LARKIN MULTI -FAMILY
STATESVILLE, NORTH CAROLINA
SUMMIT PROJECT No.: 4280.504

BMP SANDFILTER #200 (PE
TOP OF BERM = 857.00
EM. SPILLWAY = 856.00
PRINCIPAL WEIR = 855.00
BOTTOM OF BASIN = 848.51
(SEE BMP PLAN)
5
Pm �
�m2
PROPERTY BOUNDARY
68.00' DUKE R.O.W.
r
''p
" 68.00' DUKE R.O.W.
155280 PI
EXISTING
1
O BE A -DONE
(N'ELL PEBEA&ANDONEDANDCNPPEG NIRIN
PLNCf PGEOTECXNICAL
LIT I
11
STETNGINEE ,-TO
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BEEN PROVIGEG TO PARCEL
//
-6-0- MB PARCEL
— I 0
i
1 I
1 j aTaz<as
/
• X1.....1. I
k
F
,H 1.
J
`BMP WET POND #100 (PERM)
TOP OF BERM = 871.00
-�- 1EM. SPILLWAY = 870.00
PRINCIPAL WEIR = 869.00
/ BOTTOM OF BASIN = 862.50
(SEE BMP PLAN)
LEGEND FIGURE 2
SOIL TEST BORING LOCATION BORING LOCATION PLAN
SCALE: 1 " = xx'
TOPOGRAPHIC DATA: SUMMIT LARKIN MULTIFAMILY
A_' C" oAGERw. STATESVILLE, NORTH CAROLINA
" ULD BE CONSIDERED APPROXIMATE EVEN THOUGH
LSTABLISHED BY A LISCENCED SURVEYOR ENGINEERING, LABORATORY & TESTING, P.C.
100 0 50 100 200
SUMMIT PROJECT NO.: 4280.504

Summary of ESHWT Determination
SUMMIT Project Number 3595.04
Wildwood Property, North Carolina November 28, 2016
SUMMIT
ENGINEERING+ LABORATORY. TESTING
APPENDIX 3
Boring Logs

SUMMIT ENGINEERING,LABORATORY&TESTING, INC. BORING NUMBER B-1
3575 CENTRE CIRCLE DRIVE PAGE i OF 1
11A�
FORT MILL, SC 29715
SUMMIT WWW.SUMMIT-COMPANIES.COM
CLIENT Dependable Development, Inc. PROJECT NAME Larkin Multi -family
PROJECT NUMBER 4280.504 PROJECT LOCATION Statesville North Carolina
DATE STARTED 4/20/17 COMPLETED 4/20/17 GROUND ELEVATION 855.22 ft HOLE SIZE 6 inches
DRILLING CONTRACTOR SUMMIT GROUND WATER/CAVE-IN:
DRILLING METHOD Hollow Stem Auger AT TIME OF DRILLING --- GW NE ATD / Caved in Depth n 'bgs
LOGGED BY T.Coon CHECKED BY A. Jordan AT END OF DRILLING
NOTES _ See Figure 2 'Boring Location Plan" for Approx. Boring Location AFTER DRILLING ---
p
~¢ �
Lu `
W
L)
°- O
¢ J
MATERIAL DESCRIPTION
ui
H L1J
I
Uj CD
o- =)
2Z
<
o
> 0
0—
U
Lu
U w
H
O Z Q
m O >
0
A SPT N VALUE A
0 20 40 60 80 100
PL MC LL
0 20 40 60 80 100
❑ FINES CONTENT (%) ❑
0 20 40 60 80 100
Approx. 6" of Topsoil
(CL) RESIDUUM:
Firm to Stiff Red (2.5YR, 4/6) Sandy Lean CLAY with Trace Mica
SPT
1
3-4-3-5
(7)
SPT
3-5-6-7
2
(11)
(SM) Loose Red (2.5YR, 4/8) Silty Fine to Medium SAND with
5.0
Trace Mica
SPT
3
3-5-5-8
(10)
85o.z=
(SM) Loose Yellowish Red (SYR, 4/6) Silty Fine to Medium SAND
-
with Trace Mica
SPT
3-3-5-6
_
(SM) Loose Yellow (10YR, 8/6) and Very Pale Brown (10YR, 8/3)
4
(8)
Silty Fine to Medium SAND with Trace Mica
SPT
3-3-4-5
(SM) Loose Very Pale Brown (10YR, 7/4) and Light Gray (10YR,
5
(7)
10.0 -
845.2
7/1) Silty Fine to Medium SAND with Manganese Stains and
\ Trace Mica \
_
=
(SM) Loose Yellow (10YR, 8/6) and Very Pale Brown (10YR, 8/3)
Silty Fine to Medium SAND with Trace Mica
SPT
6
3-3-5-6
(8)
SPT
4-4-6-6
(SM) Loose Very Pale Brown (10YR, 7/3), Reddish Yellow (5YR,
=
6/8) and Gray (10YR, 6/1) Silty Fine to Medium SAND with
7
(10)
Manganese Stains and Trace Mica
(ML) Stiff Very Pale Brown (10YR, 7/3), Pink (7.5YR,8/4) and
s.o
Gray (10YR, 6/1) Silty Fine to Medium SAND with Manganese
Stains and Trace Mica
SPT
8
3-4-5-7
(g)
840.2
SPT
3-4-5-6
9
(9)
SPT
3-4-5-7
10
(9)
20.0 =
835.2
Bottom of Boring at 20 feet bgs, Boring Terminated
25.0

SUMMIT ENGINEERING,LABORATORY&TESTING, INC. BORING NUMBER B-2
3575 CENTRE CIRCLE DRIVE PAGE i OF 1
11A�
FORT MILL, SC 29715
SUMMIT WWW.SUMMIT-COMPANIES.COM
CLIENT Dependable Development, Inc. PROJECT NAME Larkin Multi -family
PROJECT NUMBER 4280.504 PROJECT LOCATION Statesville North Carolina
DATE STARTED 4/20/17 COMPLETED 4/20/17 GROUND ELEVATION 866.13 ft HOLE SIZE 6 inches
DRILLING CONTRACTOR SUMMIT GROUND WATER/CAVE-IN:
DRILLING METHOD Hollow Stem Auger AT TIME OF DRILLING --- GW NE ATD / Caved in Depth n 'bgs
LOGGED BY T.Coon CHECKED BY A. Jordan AT END OF DRILLING
NOTES _ See Figure 2 'Boring Location Plan" for Approx. Boring Location AFTER DRILLING ---
p
~¢ �
Lu `
W
L)
°- O
¢ J
MATERIAL DESCRIPTION
ui
H L1J
I
Uj CD
o- =)
2Z
<
o
> 0
0—
U
Lu
U w
H
O Z Q
m O >
0
A SPT N VALUE A
0 20 40 60 80 100
PL MC LL
0 20 40 60 80 100
❑ FINES CONTENT (%) ❑
0 20 40 60 80 100
866 7 =
`"' `�
Approx. 4" of Topsoil
(CL) RESIDUUM:
Firm Red (2.5YR, 4/6) Sandy Lean CLAY with Trace Mica
SPT
1
3-3-5-6
(8)
(CL) Stiff Light Red (2.5YR, 6/6) Sandy Lean CLAY with Trace
Mica
SPT
3-4-5-7
2
(9)
(CL) Stiff Yellowish Red (SYR, 4/6) and Gray (5YR, 6/1) Sandy
5.0Lean
%
CLAY with Trace Mica
SPT
3
3-5-7-8
(1 2)
861.1
(SM) Loose Yellowish Red (5YR, 4/6) and White (5YR, 8/1) Silty
-
Fine to Medium SAND with Manganese Stains and Trace Mica
SPT
3-5-5-7
=
4
(10)
SPT
3-4-5-5
5
(9)
10.0
856.'
(SM) Loose Yellowish Red (5YR, 4/6), Gray (5YR, 6/1) and White
-
(5YR, 8/1) Silty Fine to Medium SAND with Manganese Stains
SPT
2-3-5-6
=
and Trace Mica
6
(8)
SPT
3-3-5-6
7
(8)
(SM) Loose Pink (5YR, 7/4) and Gray (5YR, 6/1) Silty Fine to
s.o
Medium SAND with Manganese Stains and Trace Mica
SPT
8
2-3-5-5
(8)
(SM) Loose Pink (5YR, 7/4), Gray (5YR, 6/1) and White (5YR,
-
8/1) Silty Fine to Medium SAND with Manganese Stains and
SPT
2-2-4-5
=
Trace Mica
i
g
(6)
SPT
2-2-4-5
=
10
(6)
20.0 =
I ,
I
-
846.,
Bottom of Boring at 20 feet bgs, Boring Terminated
25.0

SUMMIT ENGINEERING,LABORATORY&TESTING, INC. BORING NUMBER B-3
3575 CENTRE CIRCLE DRIVE PAGE i OF 1
11A�
FORT MILL, SC 29715
SUMMIT WWW.SUMMIT-COMPANIES.COM
CLIENT Dependable Development, Inc. PROJECT NAME Larkin Multi -family
PROJECT NUMBER 4280.504 PROJECT LOCATION Statesville North Carolina
DATE STARTED 4/20/17 COMPLETED 4/20/17 GROUND ELEVATION 873.72 ft HOLE SIZE 6 inches
DRILLING CONTRACTOR SUMMIT GROUND WATER/CAVE-IN:
DRILLING METHOD Hollow Stem Auger AT TIME OF DRILLING --- GW NE ATD / Caved in Depth n 'bgs
LOGGED BY T.Coon CHECKED BY A. Jordan AT END OF DRILLING
NOTES _ See Figure 2 'Boring Location Plan" for Approx. Boring Location AFTER DRILLING ---
ui
o
A SPT N VALUE A
p
L)
U w
0 20 40 60 80 100
PL MC LL
~¢ �
°- O
MATERIAL DESCRIPTION
H L1J
I
Uj CD
> 0
H
O Z Q
Lu `
¢ J
o- =)
0—
m O >
0 20 40 60 80 100
2Z
U
0
W
<
Lu
❑ FINES CONTENT (%) ❑
0 20 40 60 80 100
873-7 =
`"' `�
Approx. 4" of Topsoil
(CL) RESIDUUM:
SPT
2-3-5-8
Firm Red (2.5YR, 4/6) and Yellow (10YR, 7/6) Sandy Lean CLAY
1
(8)
with Trace Mica
(CL) Stiff Reddish Yellow (SYR, 5/6) Sandy Lean CLAY with
Trace Mica
SPT
4-6-8-10
2
(14)
(SM) Medium Dense Reddish Yellow (5YR, 5/6) Silty Fine to
5.0
Medium SAND with Trace Mica
SPT
3
4-5-7-10
(12)
868.7 =
V(CL)
EX
Stiff Reddish Yellow (5YR, 5/6) and White (5YR, 8/1) Sandy
Lean CLAY with Trace Mica
SPT
3-6-8-8
4
(14)
(SM) Loose Reddish Yellow (7.5YR, 7/6), Light Gray (7.5YR, 7/1)
and White (7.5YR, 8/1) Silty Fine to Medium SAND with Trace
SPT
3-4-5-7
Mica
5
(9)
i o.o
863.7 -
(SM) Loose Yellow (10YR, 7/8), Pink (5YR, 8/4) and White
-
(10YR, 8/1) Silty Fine to Medium SAND with Trace Mica
SPT
3-4-4-7
6
(8)
(SM) Loose Yellow (10YR, 7/8), Pink (5YR, 8/4) and White
(10YR, 8/1) Silty Fine to Medium SAND with Manganese Stains
SPT
3-3-5-6
=
and Trace Mica
7
(8)
SPT
8
3-3-5-7
(8)
s.o
858.7-
SPT
3-4-6-7
g
(10)
SPT
4-4-5-7
10
(9)
20.0 -
853.7
Bottom of Boring at 20 feet bgs, Boring Terminated
25.01