SW6240904_Plansheet - Grading/Drainage Plan_20241007

Docusign Envelope ID:4CF1 F6F3-DE58-4BD7-82EE-9DCC82BO9CA7
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U I m m m TEMPORARY SKIMMER BASIN 1 W BAFFLES SHADED AREA m Q0 `°
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TOTAL DRAINAGE AREA=5.9 AC. > � 00 N
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cn 0 Q10=(0.3)(7.21N/HR)(5.9AC.)=12.7CFS Z w } � m r o
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m a (z 101) 9 l 6—9 0 0 Z# d ID w VOL. REQ'D=1,800CF/AC=(1.4AC)=2520CF
Q w W O ^ SURFACE AREA REQ'D=325SF/CFS*(12.7CFS)=4128SFLn
Q 0 Z l 6 d `0 6 L 8 Q (2:1 SIDE SLOPES - 7 DAY STABILIZATION TIME FRAME TYP.) = Z Z [ V
x qj N � a s '.I(' `.I O u l w u 9A9}S �_ SURFACE AREA PROVE ED=4250SF Z � O Q � z Z a
I/ N VOL 0 WEIR WIDTHE6=7463CF O 0 cr 0
0 .V O v m SKIMMER ORIFICE DIAMETER=1.0 Q z > Z a Q Z Z Q
I-Il 3 Q) o DEWATERING TIME: 3.1 DAYS � Q o J
IN/ N O o w Lq NOTE:CLEAN BASIN WHEN 50% FULL DURING CONSTRUCTION. WHEN UPSTREAM AREAS �7 S �n Z o
z Q (n -� O � ARE STABLE AGAINST EROSION AND PERMISSION HAS BEEN OBTAINED FROM NCDEQ,INI N (0 IL c
0 Li — REMOVE TEMP. BASIN, INSTALL PERMANENT GRADES, AND SEED ALL DISTURBED AREAS a
O I k Q) O N W �� \ \ � N PER SEED SPECS.
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NEW 2" BLOVSO Z Z CO /
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NI (n SLOPES IN THIS AREA J O
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Q) X ROADSIDE SWALE 1 TEMP. SILT
_ W O REVISED (STEEPER) IN AC ENCE AS
I + O ORDER TO ALLEVIATE DA=Q10o 158CFS SHOWN s �� 1 195 4' \
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ROADSIDE DITCHES TO l ROADSIDE LE 2 /-
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NEW 3 4° WATER \ DA=5.4 AC TRANSITION "T" r-
DIVERSION BERMS `\ IN ROADSIDE DITCH �_ L_ ZJ -� Q
I SERVICE & METER DURING CONSTRUCTION Q10=19.4 WIDE - 10 EACH
-Q N O TYP. AS SHOWN I �� X D ) o
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uOsug0F 991 P-J[)M C3-)CONSTRUCTION SEQUENCE �J O o a
— � � — � � - - - - - - - - - - - - - � � — SOIL TYPE DELINEATION 0-) m �
N uosuHor Inpd Hd9sor
1) INSTALL THE TEMPORARY CONSTRUCTION ENTRANCE. ��
> > > > > TEMPORARY DIVERSION BERM (TDB 2) INSTALL EROSION CONTROL MEASURES AS SHOWN ON Q) I z CD
Q (7 DAY STABILIZATION TIME FRAME PLANS. (f) w w o
O —•—•—•—•- -•—•—•— TEMPORARY SILT FENCE (TSF) 3) COMPLETE INSTALLATION OF SITE DRAINAGE NETWORKS T— I a z W
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LIMITS OF DISTURBED AREA AND SITE SWALES WITH ASSOCIATED EROSION CONTROL o
TOTAL DISTURBED AREA=1.5 ACRES PROTECTION BEFORE BEGINNING SITE GRADING. I Q O
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4) STRIP TOPSOIL. r 1 O
— — — — — — — — — — _ EXISTING CONTOUR 5) GRADE SITE. `J
10o FINISH GRADE CONTOUR 6) GRASS AREAS THAT WILL NOT BE DISTURBED. I =
7 INSTALL UTILITIES. V
SKIMMER BASIN DRAINAGE AREA 7) PLACE BASE-COURSE. LLJ o
— — — — — — — —a® TEMP. ROCK CHECK DAM (TRCD) 8) SEED AND MULCH ALL AREAS TO PROVIDE PERMANENT I Z — DC
J ROADSIDE DITCH DRAINAGE AREAS GROUNDCOVER WITHIN 7 OR 14 WORKING DAYS FOLLOWING (y Q -o Q
COMPLETION OF ANY PHASE OF GRADING, AND WITHIN 90 z
n CALENDAR DAYS FOLLOWING COMPLETION OF CONSTRUCTION 00I GRAPHIC SCALE -
HIGH I NOTE: ADDITIONAL EROSION CONTROL PLANS OR DEVELOPMENT. e— O Q Li
9 MAINTAIN ALL TEMPORARY MEASURES UNTIL Of Q E
so 0 25 so 100 200
&APPROVALS WILL BE REQUIRED FOR PERMANENT GROUND COVER IS ESTABLISHED. � II----�� w r r-1 Ln J
INDIVIDUAL LOTS PRIOR TO LOT DISTURBANCE 10) NO SEDIMENT OR EROSION CONTROL MEASURES ARE _j < _0
TO BE REMOVED WITHOUT THE APPROVAL OF AN NCDEQ z J
INSPECTOR. ~
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