SW8151209_Historical File_20220707

Johnson, Kelly
From: Johnson, Kelly
Sent: Thursday,July 7, 2022 3:43 PM
To: Jenny Bates
Subject: Knolls at Turkey Creek- State Stormwater(SW8 151209)
Attachments: ARC Request- Lanvale 126 Watersfield - NEW BUILD.pdf
Hi Jenny,
The "big rocks"you were asking about is what we refer to as rip rap. When rip rap is used to armor drainage, engineers
will label its placement on plans as a "rip rap apron" as shown on the first page of the attached scan. As shown on the
second page, 502 Toms Creek Road has a ditch next to it with a 15ft pipe at the end that flows downhill and into a
concrete box that slows down the water and then lets it spill out through holes cut near the top of the box as shown on
page 3. Page 3 shows that there are rip rap aprons at both ends of the pipe, but it does not quantify how much rip rap is
required. If the area is eroding then we can do an inspection and determine if additional rip rap is needed. But, ifthey
are requesting additional rip rap for aesthetic purposes then that is not required. Please advise.
Also,as a follow up to our conversation about getting your board to approve BUA, I have also attached an example of an
ARC's application for impervious area review from another neighborhood who contacted me recently. You could adapt
this type of format. (it asks for a lot more data than is needed for stormwater. You just need the existing BUA,
proposed BUA and the max allowed BUA to show that you are within the total allowed.)
If you have additional questions, please let me know.
Thanks,
Kelly
FzeUui0 h Vusow
Kelly Johnson
Environmental Engineer
NC Division of Energy, Mineral and Land Resources
Stormwater Permitting
127 Cardinal Drive
Wilmington, NC 28405-3845
Phone: [phone]
1

ROADWAY BUA: ----------- -
LOTS (126 @ 4r5O0 SF):------
PARKING (MAIL KIOSK):------
OTHER (WATERFRONT):-------
�C� v- RESERVE: ---------------
RECEIVING STREAM:--------TL
SITE � cn CLASSIFICATION: ----------
CARVER DR
S I T E SAT.
SR 1437
SWANN
PLANTATION
VICINITY MAP
NOT TO SCALE
PIPE SCHEDULE
PIPE SIZE/ PIPE UPPER LOWER PIPE DRAINAGE
ID MATERIAL LENGTH INVERT INVERT SLOPE AREA
1 18" RCP 60 17.8 17.6 0.3% 0.79 AC
2 24" RCP 52 17.1 16.9 0.4% 2.75 AC
3 24" RCP 44 15.7 15.5 0.5% 2.31 AC
4 18" RCP 44 17.7 17.5 0.5% 1.64 AC
5 18" RCP 44 15.9 15.7 0.5% 1.62 AC
6 18" RCP 44 14.7 14.5 0.5% 1 .42 AC
7 18" RCP 44 12.7 12.5 0.5% 1 .39 AC
8 24" RCP 52 15.7 15.5 0.4% 4.03 AC
9 36" RCP 60 9.2 9.0 0.3% 18.92 AC
CLASS IV RCP SHALL BE USED IN THE R/W
LEGEND
.�'-'♦ WETLAND
------- EASEMENT
PROJECT BOUNDARY
�Z9 EX. CONTOUR
lr16.8 PROPOSED ELEVATION
-- SILT FENCE o
«««««< SWALE
DISTURBED AREA
RIP RAP APRON ]- ��� ' 1�E ' "" �Lks
� c
' '`C'r all v DRAINAGE BOUNDARYjIZ
NOTES: a

EMERGENCY
OVERFLOW WEIR
ELEVATION PER •�
SCHEDULE
EXISTING GRADE
0000
OUTFA(Q► SWALE O 2X2 BOX WITH
FROM ROAD y 3 SIDED THROAT RISER W/ OUTFACE WEIR
FRAME & GRATE
HDPE OUTFALL PIPE 8 H PE WITM SOP TOP LEVEE v\��
INVERT ELEV PER SCHEDULE �� A SET BOTTOM OF BOX
DUCE CC 6 USES THROATS TO
DO(�g�2 EX GRADE
'0000oQ W>o7
o EXISTING GRADE ��"��
PIPED OUTFALL TYPICAL PROFILE VIEW ptSC� c�l� v--� ITT
WEIR LENGTH SCHEDULE OUTFACE swALEs SHALL EMERGENCY OUTFACE q\)oA -
BE
OUTFALL EMERGENCY OUTFALL OR EXCELSIORDMATTH SOD 11EIR iNFTR
FJR O O O 10 QO
BACKFILL 3' WIDE TRENCH AND C)STABILIZE WITH BERMUDA SOD
C� O �or
SEDIMENT BASIN/ - .0
_OUTFACE SWALE O
O
OUTFACE ELEVATION SCHEDULE O O O
OUTFALL OUTFALL EMERGENCY OUTFACE in PIPF WQR WAR
O
OO INSTALL COIR WATTLES O '
r •�
ON 20' INTERVALS �.00
O o
6.0
PIPED OUTFALL TYPICAL PLAN VIEW
NTS
INSTALL SOD AND COIR WATTLES
PRIOR TO ANY RAINFALL EVENTS, i
i
1
LOT 167 i
i
iA
i
i
OUTFALL WEIR
EXISTING GRADE WEIR TOP ELEV
PER PLAN
o N
EXISTING GRADE
SWALE OUTFALL TYPICAL PROFILE VIEW

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