SW3191101_Application Form_20211025 (3)

SHIELD
October 14, 2021
Mr. Jim Farkas, Environmental Engineer
DEMLR Stormwater Program
1612 MSC
Raleigh, NC 27699-11612
Via email: [e-mail]
Subject: ArchCo Residential
Cambridge Commons Apartments Denver, North Carolina
Shield Project No. 1200195-01
Detailed Dewatering Summary
Dear Jim,
Shield Engineering, Inc. (Shield) is pleased to provide this explanation of the construction
dewatering activities at the ArchCo Residential site in Denver, North Carolina. Robert Griffin,
P.E., with Shield, visited the site Tuesday October 12, 2021, to inspect the dewatering piping.
Due the nature of the soils, the Cambridge Project required evaluation of both the soils and the
moisture content of those soils. In one area of the project, expansive clays, that retain moisture,
and perched water created issues for construction of foundations and other aspects of the
project. Shield provided geotechnical evaluation of the soils and groundwater elevations in order
to assist with constructability of the project.
After a significant dewatering evaluation of the area around Building 7 and the associated parking
area for that building, Shield designed a temporary dewatering system to allow for construction
of the building foundations and parking. This temporary system was designed with dewatering
wells to temporarily lower groundwater that was perched above the clay layer. This system
utilized pumps, tanks, and recirculated water to create a venturi effect and "vacuum" water from
the wells. The system was installed and operated for approximately 2 - 3 weeks. The system has
subsequently been totally dismantled and removed from the site.
There is a stormwater BMP pond onsite designed to mitigate the effects of the parking and
structures during rain events. (See Bohler Engineering design drawings for the Stormwater
Control Measure/BMP for the site.)
4301 Taggart Creek Road www.shieldengineering.com Telephone [phone]
Charlotte, NC 28208 License No. F-0856

ArchCo Residential October 14, 2021
Shield Project No. 1200195-01 Page 2
A system of permanent passive dewatering, French drain, systems was installed sub slab to assist
in the removal of potential groundwater that may be in the vicinity of the floor slab. This design
incorporates shallow trenches with perforated pipe and stone 3 to 4 feet below the floor slab.
See the attached Shield drawings for design details of each building and the under -drain system.
The permanent building passive drains for Buildings 5 and 6 are directed to a stormwater
collection pipe that does not pass through the designed pond and would therefore have NO
impact on the pond or the design loading. During inspection there was no flow coming from the
passive dewatering systems under Buildings 5 and 6. Please reference the attached photo log for
pictures of the piping connected to Buildings 5 and 6.
Building 7 and the adjacent parking were also constructed with passive permanent drainage. The
drains from these two areas were piped to the stormwater collection system that is connected
to the Stormwater Management (BMP) Pond onsite. These are again shallow French drain
systems that are design to allow the upper 2 feet of soil to remain dry enough to reduce
"pumping" in the parking area and reduce sub slab moisture in the building. During my
inspection, there was no flow coming from either of these systems. Please reference to attached
photo log for pictures of the pipes from the parking lot and building underdrain system with zero
flow.
Based on an evaluation of the onsite BMP, there were no adverse effects from with the
temporary dewatering during construction or from the permanent passive systems that were
constructed under the building slabs.
If there are any questions or for further discussion, please feel free to contact me at any time.
Sincerely,
Shield Engineering, Inc. !\�ieaa"tCtii�,=,®
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Robert L. Griffin, P.E. = 036297`
Principal Engineer dGIN
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SHIELD
ENGINEERING

ArchCo Residential
Shield Project No. 1200195-01
October 14, 2021
Page 3
Photo 1 - Pipe from passive sub slab dewatering, French Drain, from Building 5 and 6.
No Flow.
SHIELD
ENGINEERING

ArchCo Residential
Shield Project No. 1200195-01
October 14, 2021
Page 4
Photo 2 - Pipe from passive drainage dewatering under parking lot beside Building 7.
SHIELD
ENGINEERING

ArchCo Residential
Shield Project No. 1200195-01
October 14, 2021
Page 5
f1' 1�
Photo 3 - Pipe from sub slab drainage from Building 7, showing no flow.
SHIELD
ENGINEERING

TRENCH WIDTH
PLAN VIEW
24
SECOND/
ORIF
GRADE
WET POND 2 CLASS 1
RIP -RAP
SPILLWAY DETAIL
NTS
TRENCH
WIDTH
1
/
ANTI -SEEP COLLAR.
CLASS B CONCRETE OR
COMPACTED CLAY WITH
INFILTRATION RATE OF 0.01
INCHES PER HOUR OR LESS. SECTION A -A
ANTI -SEEP COLLAR
NTS
FRONT VIEW
-RASH RACK TO OUTLET
ZOL STRUCTURE WITH
SO CAGE CAN BE LIFTED
AINTENANCE
3"X3" OPENINGS
SECONDARY ORIFICE TRASH RACK
NOT TO SCALE
FABRICATED ALUMINUM BAR GRATE
TRASH RACK WITH 5"X5" OPENINGS
24"x8" SECONDARY ORIFICE
ELEV = 778.30'
4'X4' (INT. DIMS) OUTLET
CONTROLSTRUCTURE
6" PVC DRAWDOWN ASSEMBLY
WITH 2.0" WATER QUALITY ORIFICE
ELEV. = 777.00'
5'X5'X2' CONCRETE BALLAST PAD
(INCLUDING PRECAST BOX WALLS
AND BOTTOM SLAB, FILL BOTTOM
OF STRUCTURE WITH CONCRETE
AND PROVIDE SMOOTH FINISH AT
INVERT OF STRUCTURE)
BOTTOM OF
14zOA
,
IV
a
• ; PROP RETAINING WALL
(BY OTH G 783.13
I tl
/
/'��
IDE •.II°C e / ,'/ /'/ / G 783.20
/ ^ ..n eG 782.95
IESZ i N
,
//�/
_--
' G783.00 PATIO DP RAGE WITH 4
f I \ / J
.•..'
,'/ ; ,�' � ,� G783.00 /' o CE , MAINTENANCqCy
I 4 TORAGE SPAC G782.67
I
).751 CONTRACTOR TO VERIFY LOCATION 782.67 1
i • /' \� O / G 782.46 /'/ G 782.33 G 782.51 ' G 783.15
O - OF EXISTING UTILITIES BEFORE / G 782.46 BW 78249 / o
BEGINNING POND IMPROVEMENTS. / EXISTINGSTORMWATER G782.53
T 83.96
' G 782.06
`. �. ; < •� �� Sapp _� -`'�. EASEMENT / ;
- � G 779.39
-BUILT LIGHT POLE / G 782.33 PRO
a /G 780AS
.06 - l80 ---- _ �� -
\ - LOCATION (TYP.) 782.26
% ---- G 780.10 r /
• - •' c 782.19 � TYP.
DPE
w I , G 782.62 G 783.20
\\ 6:1 SAFETY SHELF ,''r '� : G 781.99 G 781.80
SHELF:776.5 p�/ , / COMP c781.a2 (� G781.64 I•
I G 782.03 /
` • � / � / \ r r / / ` � ` � \' G 782.75 ' G 783.10 /
�/.\.\�
�`� G 781.77 '
AT TOP OF RISER STRUCTURE \ / 8" HDPE G 781.44 �0� j�.' ? \ REVISED EASEMENT LIMITS 7C
� / / `\ \\ \�� \ `� ` \ �` G 782.88
`\ STM
C PIPE � `• � - _
\ a \ PROP. YARD INLET
HICK STRIPES AT V INTERVALS G 780.55-
' G 783.45 ❑
\\```�\\\�\ \ \ \\,I\ G782.46 G783.46 G783.00
CK RED STRIPE AT T DEPTH MARKER \
---------------------------------- - - - - - - \ \ , li - - ----- - _ - AA I G 776.50 ❑❑ BUILDING 5
El
` , \ _-----------770- --- - - - - - - - - - - - - - _` -- ---- - - - _ - FFE TYPE 794.83
--- ------ ----- - - \ ` I - -- - - _ - - _ BW 783.50 _ BW 783.50 -
784.17
` ---- ------ - I - - - - - - - ---
PROP YARD INLET
' - _ ---- ------------ _----- _ - ---- ----- - -------- -
.\ � � ., � INV OUT 76 . - ----- --- I - - --
7y , `
9 7 (30")
---` - - --------------- - / -- - 773 ---- TW=BW 783.08
300 SF
RIM 782.86 - »------------- (28 UNITS)
------ _ l
SEDIMENT DEPTH MARKER
NOT TO SCALE
SCREW TYPE PLUG
6"
6" PVC PIPE AND TEE
PERMANENT POOL
12"
PVC CAP WITH 2.0" ORIFICE
DRILLED INTO BOTTOM CAP
NOTES:
1. DRAW DOWN ASSEMBLY SHALL NOT BE INSTALLED UNTIL WET DETENTION BASIN IS
STABILIZED.
DRAWDOWN ASSEMBLY
NOT TO SCALE
TOP OF POND = 783.0'
DRAINAGE STRUCTURE STEPS (NCDOT
STD 840.66) INSIDE AND OUTSIDE OF ---
STRUCTURE SPACED V VERTICALLY (TYP)
TOP OF RISER = 780.50'
SECONDARY ORIFICE
TRASH RACK
i PERMANENT POOL = 777.0'
24" 0-RING OUTLET CULVERT
ELEV = 776.5' 6" PVC DRAWDOWN ASSEMBLY
WITH 2.0" ORIFICE DRILLED IN
CAP AT BOTTOM
WET POND 2 OUTLET CONTROL STRUCTURE DETAIL
NTS
FABRICATED ALUMINUM BAR
GRATE TRASH RACK WITH
5"X5" OPENINGS
DARY CONTROL ORIFICE
R QUALITY
OUTLET CULVERT
NTI-SEEP COLLARS.
CT FILL UNDER PIPE
OTECH REPORT.
NOTES:
SEE NCDOT SPECIFICATION SECTION 840 FOR OUTLET
STRUCTURE BOX, GRATE, REINFORCING, ETC.
ALL CONCRETE TO BE MIN. 4,000 PSI COMPRESSIVE
STRENGTH.
CONVERT HOLE USED WITH SKIMMER DURING EROSION
CONTROL TO PERMANENT WATER QUALITY ORIFICE
WITH WET POND WHERE POSSIBLE. IF NOT POSSIBLE,
SEAL AND GROUT FILL HOLE USED FOR SKIMMER.
- - -- ----- -- - - - - - - - - -
/
\�/
PROP RETAINING WALL
- '
-
(BY OTHERS)
-----------------------
-- _
778
77
------ EXISTING STORMWATER --
T=BW783.00
7
---------- --
EASEMENT c782.o0 `___--
G 784.26
781 �
------ --
782
---- -- - - - -
--- ---- ----- -- -
-
---- -
(n------
\
TW784.20 _---'"-
----- -,-" __
G786.48
------
�- _ _ -
`\``\�. �
-�__.
_
-
------"" -'
/
6:1 SAFETY SH G782.40 _
/
__--- -"- u
- G 784.97
G 783.45 ----
-----------
----
- - ---- - _ - -- --------------------------
--
--- - - --
---- --- 793 ---
- - - --
-- -- - ---
--
' P MIDDLE OF SHELF: 776.5 `, -- _
_,;
----- ------
- ----
-- _
' `-'--- JIB---- SURFACE AREA IN PERMANENT POOL =6,548 SQ. FT. ` c 7az.75 '--
® ---"
_ ____ ----
-
789
- - - - --
- ---- _ -`
--- --�-__
_- ----7- -
- __ G784.00 --- __---- ,-'-
_________________
---- -----
790
----------------------- --- ----
_-
C 14 ----- -- L
G 783.72
--
-----'"' O
"-- -- --
- __ _ --
--- ----
--- --- ----
792
---- --
_
PROP 48" MH -- PRO
0" H 3 DPE�. \ P
----------- -' -
-_
- _---"
PROP YARD INLET
--- --- -- _ --
---- -
--
INV IN 771.27 (30") 0 -
- - \
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REVISIONS
REV
DATE
COMMENT
BY
1
2/12/20
2ND SUB
BUILDING PERMIT
SF
2
3/4/20
TRC SUBMITTAL
SF
3
3/18/20
DUKE LANDSCAPING
UPDATES
SF
4
4/13/20
NCDEQ COMMENTS
SF
5
7/12/20
IFC
SF
6
8/17/20
IFC
SF
-\- - C-12 '',-'' --" INV OUT 771.27 (30) - -
790 _---- _ INV IN 770.75 (30") -- BTM OF POND: 773.0
PROP 48" MH `` - -- _____ INV OUT 770.75 (30") BTM OF SEDIMENT STORAGE: 772.0 _ R��89'72 �' ;
APPROVED FOR
INV IN 769.94 (30") -- -''---------- RIM 783.45 - _ �
INV OUT 769.94 (30") BTM OF POND:770.0 __- / CONSTRUCTION
RIM 787.68 BTM OF SEDIMENT STORAGE: 769.0 `\---------- '
r /
_--'' - ----- PROJECT No.: 21591
`---------------'' ,,
DRAWN BY: TGH
PROP. RETAINING WALL BY OTHERS) i CHECKED BY. - - CHECK APL
------------ DATE:
---- I r ------ ------------------------
08/27/19
--
--- / --
AS NOTED
------ - ---
------- -- CAD I.D.: - SWO
-
----------------------"" ,
6' WIDE, 6:1 VEGETATED SHE
- ----------
---------------------------------------------------------------------------
CONCRETE SUPPLY COMPA
\�421, PG 588
' 4 _ PARCEL# 0052
------- I
TOP OF POND =
z
z
- w
� w 3:1 SLOPES ABOVE PERMANENT POOL
SLOPES ABOVE VEGETATED SHELF
¢O "
0
�3:1
co
LU o TOP OF RISER STRUCTURE = 780.50'
SEDIMENT DEPTH
o
o
MARKER
v 100-YR STORM ELEV = 781.09
25-YR STORM ELEV = 780.84'
y
10-YR STORM ELEV = 780.49
_
L 2-YR STORM ELEV = 779.22'
v
TEMPORARY POOL (WQV) = 778.30'
y
PERMANENT POOL = 777.9
INFLOW
PIPE INVERT = 774.55' (B10)
2:1 SLOPES UNDER
PERMANENT POOL
BOTTOM FOREBAY r 773.0'
BOTTOM SEDIMENT STORAGE ENTRANCE= 771.5'
BOTTOM SEDIMENT STORAGE FOREBAY EXIT =
TOP OF FOREBAY BERM = 777.0'
6' WIDE, 6:1 VEGETATED SHELF
TOP OF SHELF: 777.0
BOTTOM OF SHELF: 776.0
REB Y (TYP
OFB TH)
PUMP TO DRAIN IF
NECESSARY FOR POND
MAINTENANCE
BOTTOM POND = 770.0'
SEDIMENT STORAGE = 769.0'
EMERGENCY SPILLWAY ELEV = 780.75'
LINED WITH 18" THICK CLASS A RIP -RAP
0-RING OUTFLOW
CULVERT TO RIP -RAP
DISCHARGE POINT
'COMPACT FILL UNDER OUTLET PIPE
PER GEOTECHNICAL REPORT
ANTI -SEEP COLLARS (REFER TO
DETAIL ON SAME PAGE)
2:1 SLOPES UNDER
PERMANENT POOL
30 15 7.5 0 30
1 "= 30'
GENERAL NOTES:
1. BOTTOM OF POND AND BOTTOM OF FOREBAY
GRADES SHOWN IN PLAN VIEW DO NOT REFLECT
SEDIMENT STORAGE ELEVATIONS CONTOURS.
PROJECT:
CAMBRIDGE VILLAGE
MULTIFAMILY
FOR
NORTH PILOT KNOB ROAD,
LLC
LOCATION OF SITE
CAMBRIDGE VILLAGE
307 PILOT KNOB RD
DENVER, NC 28037
LINCOLN COUNTY
TD
D
ENGINEERING NC, PLLC
NCBELS P-1132
1927 S. TRYON STREET, SUITE 310
CHARLOTTE, NC 28203
Phone: [phone]
Fax: [phone]
[e-mail]
\\\I111III//
CAR
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161°
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SHEET TITLE:
WET POND DETAILS
SHEET NUMBER:
C-912
\\BOHLERENG.NET\SHARES\FL-PROJECTS\2019\FLB190107\DRAWINGS\PLAN SETS\NCC172159 - SWO.DWG PRINTED BY: SFARMARTINO 8.18.20 @ 3:46 PM LAST SAVED BY: SFARMARTINO
WET POND 2 CROSS SECTION
NTS (10:1 VERTICAL EXAGGERATION)
AFTER STABILIZATION BUT PRIOR TO PAVING, POND
TO BE DREDGED AND CONVERTED FROM SKIMMER
SEDIMENT BASIN TO PERMANENT WET POND.

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DESCRIPTION LENGTH
SLOPE
UPPER INV.
LOWER INV.
PIPE MAT'L
"
r
cow
Co
0
RIM-789.72'
IN-771.27'
NORTH TRENCH *146
1.00%
*777.7
*776.2
6" PERFORATED PVC
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BUILDING 5
OUT-771.27'
SOUTH TRENCH *146
1.00%
*777.7
*776.2
6" PERFORATED PVC
SHEET TITLE:
TYPE 334
NOTE:
to STORM STIR*81.3
2.00%
*776.2
*774.6
6" SOLID PVC
FFE = 794.83
TIE
PLAN
VIEW
FFE = 784.17
INTO EXISTING
NOTE:
0 10 20 40
BUILDING 5
STORM DRAIN,
ELEVATIONS ARE BASED
ON FF ELEVATIONS
OF EACH
BUILDING AS SHOWN
ON THIS DRAWING. ALL
10,300 SF
DESIGNED BY
*DIMENSIONS AND *ELEVATIONS ARE SUBJECT TO CHANGE BASED ON EXISTING FIELD CONDITIONS. MINIMUM SLOPE
SHEET:
(28 UNITS) OTHERS ON ALL PIPES = 1.00%. (IN FEET)
1 "=20'

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BUILDING 6
TYPE 334
FFE = 795.33
FFE = 784.67
10,300 SF
(28 UNITS)
ST
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w
B-60(4)
B-70(5)
B-80(6)
RIM-783.12'
RIM-783.04'
RIM-783.25'
IN-775.81'
OUT-775.81'
IN-776.30'
OUT-776.30'
IN-776.71'
OUT-776.71' �
a
v r v'd I
e'
1 % SLOPE
PERMANENT
DEWATERING 6'
PERFORATED TRENCHES_
SEE CROSS-SECTION
SOLID PVC DETAIL - SHEET 4
@ 10.75% �I
DESCRIPTION
LENGTH
SLOPE
UPPER INV.
LOWER/NV.
PIPE MAT'L
NORTH TRENCH
*148
1.00%
*778.2
*776.7
6" PERFORATED PVC
SOUTH TRENCH
*148
1.00%
*778.2
*776.7
6" PERFORATED PVC
to STORM STR
*37.2
8.60%
*776.7
773.5
6" SOLID PVC
NOTE: ELEVATIONS ARE BASED ON FF ELEVATIONS OF EACH BUILDING AS SHOWN ON THIS DRAWING. ALL
*DIMENSIONS AND *ELEVATIONS ARE SUBJECT TO CHANGE BASED ON EXISTING FIELD CONDITIONS. MINIMUM SLOPE
ON ALL PIPES = 1.00%.
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0 10 20 40 BUILDING 6
SHEET:
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1 "=20'

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1 % SLOPE PERFORATED TRENCHES OMFC 2.4' I
-- — — — — —
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ca
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BUILDING 7 SHEET TITLE:
TYPE 234
FFE = 785.17 PLAN VIEW
0 10 20 40 BUILDING 7
FFE = 795.83 NOTE: ELEVATIONS ARE BASED ON FF ELEVATIONS OF EACH BUILDING AS SHOWN ON THIS DRAWING. ALL
9,250 SF *DIMENSIONS AND *ELEVATIONS ARE SUBJECT TO CHANGE BASED ON EXISTING FIELD CONDITIONS. MINIMUM SLOPE
(28 SHEET:
UNITS) ON ALL PIPES = 1.00%. (IN FEET) 3
1 "=20'
DESCRIPTION
LENGTH
SLOPE
UPPER INV.
LOWER INV.
PIPE MAT'L
NORTH TRENCH
*122
1.07%
*778.7
*777.4
6" PERFORATED PVC
SOUTH TRENCH
*131.2
1.00%
*778.7
*777.4
6" PERFORATED PVC
to STORM STR
*18.6
1.00%
*777.4
*777.2
6" SOLID PVC
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EAST LOT
NOTE: ELEVATIONS ARE BASED ON FF ELEVATIONS OF THE EAST LOT AS SHOWN ON THIS DRAWING. ALL *DIMENSIONS
AND *ELEVATIONS ARE SUBJECT TO CHANGE BASED ON EXISTING FIELD CONDITIONS. MINIMUM SLOPE ON ALL PIPES = 1.00%.
I
W
PERMANENT
DEWATERING
ORATED TRENCHES
E
I
0 10 20 40
(IN FEET)
1 "=20'
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SHEET TITLE
PLAN VIEW EAST
PARKING LOT
SHEET:
5