SW4220801_Plansheet C-1.2A - Existing Conditions_Survey_20220825

SUFFICIENT TO DIRECT ALL SEDIMENT -LADEN STORMWATER INTO A SEDIMENT CONTROL DEVICE. MUST BE INSTALLED
PRIOR TO CLEARING AND GRUBBING OF THE AREA (OR IN CONJUNCTION WITH THIS OPERATION IF SEDIMENT
CONTROLS AND DIVERSIONS ARE INSTALLED AS EACH CRITICAL POINT IS REACHED). I I
A- DIVERSIONS SHOULD BE LOCATED TO MINIMIZE DAMAGES BY CONSTRUCTION OPERATIONS.
B- DIVERSIONS SHOULD BE SEEDED & MULCHED IF THEYARE TO REMAIN IN PLACE OVER 30 DAYS.
C- CHECK DEVICE AFTER EACH RAIN, BUT ONCE A WEEK REGARDLESS REPAIR AS NECESSARY.
I I
12" MIN
SLOPE 2:1 /FAO I
MAX `,° /� - BERM
NATURAL GROUND OR COMPACTED FILL =
FILL /CUT SLOPES � � � I +
/7�
/ + J
NATURAL GROUND OR
FILL / CUT SLOPES I I -III -III -III -III -I , 18 MIN DEPTH i II I I �ITII I-1 I I DITCH
_,I l hill l hill l hill l hill l ll �l l ll l ll l ll l �l _I I II I I -I I' / +
FLOW /
12" MIN I
18" MIN DEPTH
- +
NATURAL GROUND OR 11=
BERM/DITCH
FILL / CUT SLOPES
I
NOTES:
POSITIVE GRADE MUST BE PROVIDED TO ASSURE DRAINAGE IF SLOPE EXCEEDS 2%, SEED AND MULCH DIVERSION. TRY NOT I
TO EXCEED 5% (HIGH VELOCITIES RESULT). MAXIMUM D. A. = 5 ACRES WITHOUT SUPPORTING CALCS. DIVERSIONS AT THE
TOP OF SLOPES MUST EMPTY INTO AN APPROVED SLOPE DRAIN. BERM/DITCH IS MOST COMMONLY USED I I
MAINTENANCE: I
INSPECT TEMPORARY DIVERSIONS ONCE A WEEK AND AFTER EVERY RAINFALL. IMMEDIATELY REMOVE SEDIMENT FROM THE
FLOW AREA AND REPAIR THE DIVERSION RIDGE. CAREFULLY CHECK OUTLETS AND MAKE TIMELY REPAIRS AS NEEDED. +
WHEN THE AREA PROTECTED IS PERMANENTLY STABILIZED, REMOVE THE RIDGE AND THE CHANNEL TO BLEND AREA WITH \ +
NATURAL GROUND LEVEL AND STABILIZE APPROPRIATELY. /
i ARE C PLE L
TEMPORARY DIVERSION BERM / DITCH I +s ROU D ITH T
FE E ND S NICE
T TAT O POI
I
NOTES.
APPLICABLE AT ALL POINTS OF
INGRESS AND EGRESS UNTIL SITE IS
STABILIZED. FREQUENT CHECKS OF
THE DEVICE AND TIMELY
MAINTENANCE MUST BE PROVIDED
y i BY CONTRACTOR. {
ROPD�P
J
0 \
URB ti7N V
20'R
8" MIN 25 I
2-3" COARSE AGGREGATE
FILTER FABRIC UNDER STONE /
AND ON SIDES
NOTES.
WASHED STONE PAD TO BE 501 X 25'W X 6" TH MINIMUM (1001 MIN IN URBAN AREAS). IF THE +
ADJOINING ROADWAY IS WIDER THAN 25', THEN THE WASHED STONE SHALL BE AS WIDE AS THE
ADJOINING ROADWAY. +
TURNING RADIUS OF 20' MINIMUM TO ACCOMMODATE LARGE TRUCKS SHALL BE PROVIDED. \
ENTRANCE(S) SHOULD BE LOCATED TO PROVIDE FOR MAXIMUM USE BYALL CONSTRUCTION
VEHICLES.
MUST BE MAINTAINED IN A CONDITION WHICH WILL PREVENT TRACKING OR DIRECT FLOW OF
MUD ONTO ADJACENT STREETS.
PERIODIC TOP DRESSING WITH STONE (2" THICK) WILL BE NECESSARY. ANY MATERIAL WHICH
STILL MAKES IT ONTO THE ROAD MUST BE CLEANED UP IMMEDIATELY.
TEMPORARY GRAVEL
CONSTRUCTION ENTRANCE / EXIT
NOT TO SCALE
/
+
+
+
ZONE AE (100 YEAR)
FLOODPLAIN
PROPOSED SEPTIC AREA
v v v EX. ROW
A
MELVIN DENTON NOTE: NO WETLANDS ARE LOCATED WITHIN THE
761953 AREA OF THE PROPOSED DEVELOPMENT AS THE
/ ALAMANCE COUNTY ENTIRE AREA OF PROPOSED IMPROVEMENTS IS
/ f DB 4134 /478 CURRENTLYAN AGRICULTURAL FIELD THAT IS NC GRID COORDINATES
J SIZE: 12.17 AC REGULARLY DISTURBED . THE FLOODPLAIN AREA HAS NAD 83(2011)
USE. • VACANT NOT BEEN EVALUATED FOR SUCH FEATURES
N 809532.69
EX. TREELINE
E 19128�73
41
T -3
/
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Tg1
CONCRETE OUT
TO BASED BY ALL / I l
SOTS WITHIN THE /
PROJECT__ / i
/ S8,
I I I I I ♦ I
a I I I I I I I I I ♦ I I / / / / ��_2 CIMLAND L C
_ / / / 161952
\ ` \ ` \ \ ` \ \ \ \ \ ( ♦ I I / TD / / / ' / ALAMAN�COUNTY / / / /
\ \ \ \ \ \ \ \ \ \ \ ♦ I I / / , / ,D�B�4178 / 678 / / , / / / / - - I / / L ,
// USE: VACANTI
\ \ \\ \ \ \ \ \ \ \ \ 1 \ 1 I I ( DA = 85,6542 / , , / /' / // / / l l l i l ICE
�I I � \ \ s \ \ \ \\ I `I \I I ♦`I i I � (5187 Aj C)
4D-- I 4D /
�_ I /_' / / / I / / I I I I I �i \ , i `h �,
��`_ / owe// / I I I I I j Y / ll/ /�l l
I I I I I � ♦� I/
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_ Nft I I I ,•< / �� / I
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TUNE�IE (10 YEAR AOODLAIN�I �I
W ;TEA BOU&DAR1� DEFMIED\BY
T CENI ERLINE\OF " OTE� CRkEK"
PEkEXISTIII/G BO NDA�Y SgRVE\Y
BY BIPSWEL SURFORS IN . JO�
NO. 2f-101- 00DATED4,�16/2 20I
III
uiversion / uitcn Scneaule
*TEMPORARY LININGS WILL REMAIN THROUGHOUT
Name
Q25
V25
St es opes
Slo a (%
p )
Depth (ft)
Flow Dept
Shear Stress
*
Lining
c s
s
X.•1
s
CONSTRUCTION AND PERMANENT SEEDING /S
REQUIRED PER THE LAND DISTURBANCE PERMIT. NO
TD-1 / PD-1
2.56
3.04
3
4.20%
1.50
0.53
1.39
NAG-DS75
PERMANENT LININGS ARE REQUIRED BASED UPON
V(ALLOW) OF UP TO 5 FPS FOR NATURALLY LINED
CHANNELS WITH SLOPES LESS THAN 5%.
_ .,
TD-2 / PD-2
7.71
3.64
3
3.25%
1.50
0.84
1.71
NAG-DS150
TD-3
1 7.21
2.65
3
1 1.45%
1.50
0.95
0.86
NAG-DS75
TD-4
1 2.03
2.77
3
1 3.83 %
7.50
0.49
7.78
NAG-DS75
SKIMMER BASIN (TSB) SCHEDULE:
DRAINAGE AREA:
5.87 A C
Q25:
0.20 x 7.92 IN/HR x 5.87 AC = 9.30 CFS
REQUIRED PROVIDED AT 519.50
VOLUME (CF):
9,572 9,563
SUFACE AREA (SF):
3,021 4,818
DEPTH (FT):
2.00 2.50
WEIR WIDETH (FT):
- 10
WEIR ELEVATION (FT):
527.50
TOP BASIN ELEVATION (FT):
529.00
BOTTOM BASIN ELEVATION (FT):
525.00
DESIGN STORM ELEVATION (FT):
527.50
SKIMMER SIZE SCHEDULE:
REQUIRED BASIN VOLUME:
9,572 CF
DAYS TO DRAIN.-
3 DAYS
SKIMMER SIZE.
2.00"
ORIFICE RADIUS:
1.001,
ORIFICE DIAMETER:
1.901,
ON -SITE DISTURBED AREA
271,021 SF (6.22 AC)
OFF -SITE DISTURBED AREA
3,149 SF (0.07 AC)
TOTAL DISTURBED AREA
274,170 SF (6.29 AC)
PERMITTED DISTURBED AREA
304,920 SF (7.00 AC)
Know what's below.
Call before you dig.
GRAPHIC SCALE
25 0 25 50 100
(IN FEET)
1 inch = 50 ft.
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C3 PROJECT #:
21-026
REVIEW PROJECT #:
XX-XXX
SHEET #:
C-1.2A