NCG021027_Map 2_20231122

Construction Specifications 8.Inlets--Discharge water into the basin in a
manner to prevent erosion. Use temporary slope SEDIMENT &TAILINGS BASIN SECTIONAL VIEW
1.Ciear, grub and strip the area under the drains or diversions with outlet protection to
embankment of all vegetation and root mat. divert sediment-laden water to the upper end of
Remove all surface soil containing high amounts the pool urea to improve basin trap efficiency
of organic matter and stockpile or dispose of it
properly. Haul all objectionable material to the 9.Erosion control--Construct the structure so
designated disposal area. Place temporary that the disturbed area is minimized. Divert 5' MIND BASIN LENGTH-PER PLAN VIEW STORMWATER
water away from bare areas. Complete
sediment control measures below basin as needed. surface w� "A'
.�UNrOFF
2.Ensure that fill material for the embankment is Stabilize 1nkment before the area is cleared. TOP OF EMBANKMENT A _ I II�II-11 II Ili -
the embankment
the emergency spillway embankment and
EMERGENCY SPILLWAY "B" I U I- � li I I � �I�I,Owl
free of roots, woody vegetation, organic matter, all other disturbed areas above the crest of the 10-YR WATER SURFACE ELEVATION C ^i II SAFETY FENCE
and other objectionable material. Place the fill in principal spillway immediately after construction. (SEE DETAIL) - - II I 1 II _- NECESSARY)
- .,, (ALONG PERIMETER)
lifts not to exceed 9 inches and machine I ISER CREST "D" (AS RY)
compact it. Over fill the embankment 6 inches to 10.Install porous baffles as specified in Practice I I EARTHEN DAM -
p P P "�• II �)-•�
allow for settlement. 6.65 Porous Baffles (S I' PVC SKIMMER I I
.I'C _I (SEE
3.Shape the basin to the specified dimensions. 11.After all the sediment producing areas have -_ PRINCIPLE DETAIL)
r,Prevent the the skimming device from settling into been permanently stabilized, remove the structure PLUNGE POOL AY
ANTI-SEEP COLLAR SPILLWAY�1��11 (SEEDETAIL) JID the mud by excavating a shallow pit under the and all the unstable sediment. Smooth the area (SEE DETAIL)
skimmer or providing a low support under the to blend with the adjoin areas and stabilize j
skimmer of stone or timber. properly. -_ _ --
I- ORIFICE -i' IP-RAP STABILIZATION
4.Place the barrel (typically 4-inch schedule 40 Main tenarnce --BARREL --_ -_ BASIN BZ:ZI I MI i R PLAINI �i Ii I- I�i I I I I I�I I b f�I I1-I I 11={1�=1 wl I I�I I�I T-
I I-I -III-I I-1 I H`_I�I-L '=I I-I-11�I I f=1 I I I�-� III-71 I� - � _, I
PVC pipe) on a firm, smooth foundation of -- - _ -
,_ r. II�IfI II
impervious soil. Do not use pervious material such Inspect skimmer sediment basins at least weekly - I� ir�fi'---�i_„-,_I I i
P P I i i-i i 1-1 I H I H 11= I I�I
as sand, gravel, or crushed stone as backfill and after each significant (one-half inch or 'l�II�II
around the pipe. Place the fill material around the greater) rainfall event and repair immediately. RISER ANTI-FLOATATION ' ( )
pipe spillway in four inch layers and compact it ( )- BASIN BOTTOM SLOPE 0.5% MIN.
under and around the pipe to at least the some
Remove .sediment and restore the basin to its s xs'x2' Concrete
density as the adjacent embankment. Care must original dimensions when sediment accumulates to
be taken not to raise the pipe from the firm one-half the height of the first baffle. Pull the
contact with its foundation when compacting skimmer to one side so that the sediment EMERGENCY SPILLWAY DETAIL-
of
under the pipe haunches. Place a minimum depth underneath it can be excavated. Excavate the
two feet of compacted backfill over the pipe sediment from the entire basin, not just around RIP-RAP, 10-INCH D50
spillway before crossing it with construction the skimmer or the first cell. Make sure
2-h O(e S/
equipment. In no case should the pipe conduit be
installed by cutting a trench through the dam vegetation growing in the bottom of the basin 0 PH
after the embankment is complete. does not hold down the skimmer. GEOTEXTILE FABRIC
S.Assemble the skimmer following the Repair the baffles if they are damaged. RISER
manufacturer's instructions, or as designed. Re-anchor the baffles if water is flowing T. _ - 20 RH ROUND
underneath or around them. I- �� _
61ay the assembled skimmer on the bottom of If the skimmer is clogged with trash and there is I I I
the basin with the flexible joint at the inlet of
water in the basin, usually jerking on the rope will
the barrel pipe. Attach the flexible joint to the make the skimmer bob up and down and dislodge
barrel pipe and position the skimmer and anchor _
it to the side of the basin. This will be used to the debris and restore flow. /f this does not work, I I-III-III-� I � -- -- ��-- 7-��-�✓� �_�
�I I
pull the skimmer to the side for maintenance. pull the skimmer over to the side t the basin _ � AF
and remove the debris. Also check the orifice -I ( I-) I I-III-III- __ __ ___ _ _ _ I-III- -VV SPILLWAY WIDTH
7.Eorthen spillways--Install the spillway in inside the skimmer to see if it is clogged; if so I I-III-) I I-III-III-III-III-I -� -� I -III-I I Ed II (-
undisturbed soil to the greatest extent possible. remove the debris. -III-I I (-III-) I I-) I I-III-III-) I I-III-III-I I (-I ( I- CL
The achievement of planned elevations, grade, ,- - _ INSTALL SKIMMER INTO ORIFICE --- - \--------BARREL
design width, and entrance and exit channel If the skimmer arm or barrel pipe is clogged, the _I I (-III-III-III-III-I I (-III-III-) I I-III-I
slopes are critical to the successful operation of orifice cam be removed and the obstruction I ( H D P E U
the spillway. The spillway should be lined with I I-III-) I I-III-III-III-III-III-I I (-I I cn m
laminated plastic impermeable geotextile fabric. =III-III=I 1 1=III=III=III=III=1 I W -
The fabric must be wide and long enough to cleared with a plumber's snake or by flushing with
corner the bottom and sides and extend onto the
top of the dam for anchoring in a trench. The water. Be sure and replace the orifice before
edges may be secured with eight inch staples or repositioning the skimmer.
pins. The fabric must be long enough to extend Check the fabric lined spillway for damage and
down the slope and exit onto stable ground. The
width of the fabric must be one piece not joined make any required repairs with fabric that spans W
U
or spliced; otherwise water can get under the the full width of the spillway. Check the SEDIMENT&TAKINGS BASIN DESIGN TABLE
fabric. If the length of the fabric is insufficient embankment, spillways, and outlet for erosion Q
for the entire length of the spillway, multiple damage, and inspect the embankment for piping 0 cD
sections, spanning the complete width may be and settlement. Make all necessary repairs
used. The upper sections should overlap the lower immediately. Remove all trash and other debris
sections so that water cannot flow under the from the skimmer and pool areas.
fabric. Secure the upper edge and sides of the
fabric in a trench with staples or pins. Freezing weather can result in ice forming in the BASIN VOLUME BASIN SURFACE AREA
basin. Some special precautions should be taken
in the winter to prevent the skimmer form VOLUME AREA AREA CLEAN TOTAL SKIMMER
plugging with ice. DRAINAGE DENUDED AREA 10 YEAR Q VOLUME REQ'D PROV'D REQ'D PROVIDED OUT STORAGE BASIN WEIR DEPTH TOP DAM SKIMMER ORIFICE DIA.
BASIN AREA (ac) (ac) (cfs) (ft^3) (ft^3) (ft^2) (ft^2) DEPTH (ft) DEPTH (ft) DEPTH (ft) WEIR WIDTH (ft) (FT.) WIDTH (FT.) PIPE DIA. (IN.) (IN.) d
cc
J 0
P-1 11 .7 8.1 38 14,580 14,600 16,553 21 ,780 2.0 4.0 6.0 10 2.00 8.00 4 2 Z J 3 NLL
0.8 35 1,440 1,500 15,246 18,730 2.0 3.5 6.0 10 2.00 8.00 4 2 w 111111� ci8
rol
P-2 0.8 n C Z
P-3 24.9 15.3 75 27,540 27,540 32,670 55,975 1.8 7.0 10.5 20 2.00 8.00 4 2 a Co m x_2
111DID000
Total 37,9 24,9 u 0 00
WATER ENTRY UNIT GENERAL NOTES:
WITH TRASH SCREEN
1. PROPER DESIGN MUST BE COMPLETED TO MINIMIZE PIPING AROUND
PRINCIPLE SPILLWAY DETAILS DISCHARGE PIPE.
2. C-
PR❑PER ❑RIFICE OPENING MUST BE SELECTED T❑ ENSURE P❑ND DRAINS IN ,
CORRECT AM❑UNT OF TIME. M❑DIFICATI❑NS MAY BE REQUIRED IF FIELD c ,
CONDITIONS WARRANT A CHANGE. Q
3. EMBANKMENT MUST BE COMPACTED TO DESIGN SPECIFICATIONS. - E M
4. EMERGENCY SPILLWAY MUST BE CORRECTLY SIZED AND EROSION '
❑RIFICE ❑PENING INSIDE PROTECTI❑N INSTALLED. LiJ N
THE HORIZONTAL TUBE WITH 5. ER❑SION PR❑TECTION MUST BE INSTALLED ALONG THE EMBANKMENT AND AT , I-
- ,- A CONSTANT HYDRAULIC THE DISCHARGE END OF THE PIPE, Q C)
di HEAD 6. INSPECT SYSTEM REGULARLY TO ENSURE IT IS FUNCTIONING IN A CORRECT V- GINE�- �G, C]
MANNER. >i�� e to
-- L
7. EIGHT SIZES OF SKIMMERS ARE AVAILABLE, REFER TO THE FLOW SHEET, ���RY+ +++M� �Po6`° O
CUT SHEET, AND INSTRUCTIONS ON WEB SITE FOR EACH SIZE.
770,0 770.0 771.5 SCHEDULE 40 PVC PIPE EARTHEN EMBANKMENT
RE= RISER EL F?E= RISER EL F�'E= RISER EL (BARREL OR ARM)
3,0-F-t S,0-F t 7 0-F t EMERGENCY SPILLWAY MAXIMUM HEIGHT ❑F HDPE RISER LI..I g
F?H= RISER HEIGHT FAH= RISER HEIGHT F;J-i= RISER HEIGHT (MAJOR STORM EVENT) _J � €
� = RISER DIM 2I n � = RISER DIM 2 4-i n � = RISER DIM 3 6-i n HOSE
FLEXIBLE a
18-in 18-in 18-in s
FLOAT
d= BARREL DIAMETER d= BARREL DIAMETER d= BARREL DIAMETER U ��F
_ W U �1i
Z PVC WENT W
RISER DETAILS RISER DETAILS RISER DETAILS =III=1I PIPE z .,
PH= PERF EL 769.0 PH= PERF EL 766.5 PH= PERF EL 768.0
MA
_ T❑P VIEW -II II FLOAT ` , Lo a
FLEXIBLE HOSE MUST BE p� at
0
Pr,= PERF DIAMETER 2-in Ph= PERF DIAMETER 2 i n PI-i= PERF DIAMETER 1-in PVC VENT SECURELY FASTENED T❑ _I Q gsI
c PIPE I THE WATER QUALITY 0 m�
7 6 7,5 7 7 0,5 I DISCHARGE ❑PENING 0 n z
PH= PERF EL PH= PERF EL PH= PERF EL - 0/y Q H
L� ` �• o
Ph= PERF DIAMETER F'H �= PERF DIAMETER -I n Ph= PERF DIAMETER 1 I n - OUTLET PIPE �"
P = PERF EL P = PERF EL 768.5 PH= PERF EL - ! ' Q a 51
H H - ` FLEXIBLE Y 8 4
2-in = HOSE
Ph= PERF DIAMETER Pl i= PERF DIAMETER PI--,= PERF DIAMETER = 1.4 X DEPTH
= TOP OF DAM 773.0 ,� = TOP OF DAM 773,0 A = TOP OF DAM 774.0 I I- THE OVERFLOW � O
A I MINIMUM LENGTH APPLIES z U s
B =SPILLWAY 772.0 B =SPILLWAY 772.0 B =SPILLWAY 772.5
WATER ENTRY UNIT I SCHEDULE 40 PVC - "-
-7 p III ARM) (BARREL OR Z Z
C = WATER EL 7 71.8 C = WATER EL 770.7 C = WATER EL 71.1.8 - _ _ _ _ - _ _ _ - _ _ _ = Q
ENDEmf
= Non f'1 e SIPHON 7-Ft VIEW SIDE VIEW MAINTAIN DEPRESSION T❑ - _ - 0 P�
D = SIPHON 5--Pt D SIPHON D MINIMIZE CHANCE ❑F
(N❑ SCALE) ry
SKIMMER BECOMING STUCK DRAWN BY T. R. EVANS
2-in None 2-in 10/10 LJAj
= ORIFICE DIAMETER �= ORIFICE DIAMETER �= ORIFICE DIAMETER h o
EAIRCLOTH SKIMMER °DISCHARGE SYSTEM WITH OUTLET J. W. FAIRCL❑TH & SON INC. -� ;t
767,0 None 765.5 WWW,FAIRCL❑THSKIMMER.C❑M � as
�= ORFICE EL �= ORFICE EL �= ORIFICE ELTELEPHONE, C919) 732-1244
STRUCTURE FAX, [phone] W 9Zo
EMAIL, WARREN@FAIRCL❑THSKIMMER.C❑M1
0�9
THIS DETAIL HAS BEEN M❑DIFIED BY R.D. DAVIS ENGINEERING,
PLLC TO CHANGE RISER STRUCTURE FROM WATER QUALITY RISER
TO EROSI❑N CONTROL SEDIMENT BASIN RISER JOB NUMBER SHEET NUMBER
220703.440 C-501
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