NCG021042_Scanned Site Plans 3 _20240730

SECONDARY SPILLWAY
CONSTRUCTION ENTRANCE/EXIT SILT FENCE DETAILS
SEDIMENT BASIN Wit SKIMMER DETAIL
Minimum 12-112 Gauge Intermediate Wires
TOP OF EMBANKMENT 3 1 1 3 Minimum lOGauge Line Wires
See Basin Schedule 8'MAXIMUM
RISER STRUCTURE _ See Basin Schedule i�.u;aiblersd,rectedDyrheem€iR�r,
MIN-
TRASH �d.. 1r,. ',.+. Pipe Connections
�-')��+ E--EMERGENCY SPILLWAY -Ensure that all comduit connections are watertight. Rod and
TRASH RACK FREEBOARD- )a '
Silt -cc Fa c
i MIN_ , PF = 1 51�1� �4� 1 �1E1Z- �" lug type connector bands with gaskets are preferred for corrugated Laminated Plastic Liningor Ps���w° fro 'tG Grade
SKIMMER } p ° f�(1-JP�I N�I �I JI�( JeMp SSE a
1y�a 11.E 41CI� IZW 1114I1= IlN1llI �11�9t1� `► ,y metal pipe to assure watertightness under maximum loading and internal Impermeable Geotextile Fabric 4w
�"- 1►1d�lllt 1f 161 ( R f �� ' -r-it��ltll�ltR f1 '�" pressure. Do not use dimple universal connectors under an
ar II 1C 1 1> ;_011 1C1� 110I 'im Q11 ZE11113'11u"g1C1��1� � c p (universal) Y
" ► circumstances. OUTLET PROTECTION DETAILS
mil
BARREL Go�P 1
Y
PIPE
Trash guard PG
-It is important that a suitable trash guard be installed to prevent the riser {�
rv\ and barrel pipes from becoming clogged. Install a trash guard on the 4 Notes:
CLASS B STONE PACs CUT-OFF p prevent trash and other debris from clogging the conduit. o 0
t0 of the riser to gg g a �j Gt 1. Clear the entrance/exit area of all vegetation,roots and other objectionable material. steel Post
(#'xd'x i'VAIN.) ANTIFLOTATION BLOCK SECTICII�IAL VIEW ANTI-SEEP STABILIZED �n?6
0 -0
TRENCH COLLAR OUTLET A combination ante-vortex device and trash guard improves the efficiency o o o2. PlaCe 2-3"Coarse aggregate. Woven Ware Fablric
a 4.(�' 4.0 4.0'
2 DEEP of the principal spilllway and protects against trash intake. o - 0 0 0 o silt Fence ceotextile Fabric
1,1 0" 3.9 ft. Maintenance Considerations:Maintain the gravel pad in a condition to prevent
� mud or sediment from leaving the construction site. This may require periodic
Protection against]piping CMP Outlet PipeV
. topdressing with 2-inch stone. After each rainfall,inspect any structure used to 3'-0"
O 11 O trap sediment and clean it out as necessary. Immediately remove all objectionable 26"
- Install at least one; watertight antiseep collar with a minimum projection G Cfi �$ ( r
3 ft. T�� � 6 materials spilled,washed,or tracked onto public roadways.
NOTES of 1.5 feet around the barrel of principal spillway conduits, 8 inches or o ?P0 �� 4°Min.
1. SEED AND PLACE MATTING FOR EROSION CONTROL ON INTERIOR AND EXTERIOR SIDESLOPES. . d' o.c�' 4. see sheet t For locations
larger in diameter. Locate the anti-seep collar slightly downstream from � o . o Grade
2. INSTALL A MINIMUM OF 3 COIR FIBER BAFFLES IN ACCORDANCE WITH PRACTICE STANDARD 6.65. the dam center line;. A properly designed drainage diaphragm installed O � �
s"M
3. INSTALL SKIMMER AND COUPLING TO RISEN` STRUCTURE OR DIRECTLY INTO EMBANKMENT 1 FT. FROM BOTTOM OF BASIN. o inimum Cover over skirt
around the barrel may be used instead of an anti-seep collar when it is 4_d a"Minimum horizontal turn
4.THE ARM PIPE SHALL HAVE A MINIMUM LENGTH OF 6 FT. BETWEEN THE SKIMMER AND COUPLING. NOT TO SCALE 1 2
appropriate.
$ ft.
Note: t
Inspect outlet protection structures weekly and after significant (1/2" or greater)
rainfall events to see if any erosion around or below the riprap has taken place, Silt Fence Specifications
or if stones have been dislodged. Immediately make all needed repairs to 1.Steel posts shall be a minimum of 5 ft.long,weigh a minimum of 1.3 Ib/ft,and
prevent further damage. have projections to aid in fastening the wire or fabric. Steel posts shall also
have a metal plate welded near the bottom such that when the post is driven
to the proper depth,the plate will be below the ground level for added stability.
2. Woven Wire Fence shall conform)to the requirements of ASTM A 116,
Skimmer shown in " Aluminum straps 7A 1 OVERCUT CHANNEL 2" PAGE: Class I zinc coating for wire. The fence shall be at least 32 in.high and shall
OVERLAP E:
2 Vent ER TO ALLOW BULKING have at least 6 line(horizontal)wires. Stay(vertical)wires shall be spaced
suspending 6'MIN DURING SEEDBED LONGITUDINAL
RISER STRUCTURE floating position with Orange tip STAKES ATT-5' _ PREPARATION ANCHOR TRENCH 12 in.apart. The top and bottom wires shall be 10 gage. All other wires shall
horizontal intake INTERVALS be 121/2 gage.
DESIG DEPTH
STEEL POSTS(QUANTITY VAR.) SKIMMER(SIZE VAR.) _ _
4" Sch 40 4" pvC float / n 3. Filter Fabric shall be composed of fibers consisting of long chain synthetic
/EMBANKMENT Coupling / CHECK SLOTS AT ( I- 1_1 polymers composed of at least 85%by weight of polyolefins,polyesters,or
PLASTIC SLOPE DRAIN PIPE / STONE ENERGY 25'INTERVALS = _ _ _ polyamides. The fibers shall be formed into a network such that the filaments
1� Connection 33�
(PRACTICE STANDARD 6.32) DISSIPATOR or yarns retain dimensional stability relative to each other. The filter fabric shall
OR be free of any treatment or coating which might adversely alter its physical
GEOTEXTILE LINING 3" Seh 40 SOLID pve barrel �`r _ ,2 f WITH R so o rL properties after installation. The fabric shall be free of defects or flaws which
"arm",
;` : BIANKETSORTURF
or arm �, REINFORCEMENTMATS significantly affect its physical and/or'filtering properties. The fabric shall have
v •x° ': `.. p 3 INITIAL.CHANNEL ANCHOR TRENCH TERMINAIL SLOPE AND CHANNEL s MN aminimum width of 36 inches.
_ •'' "' �,r r r„„r ` SUPPLIED BY USER ANCHOR TRENCH LONGITUDINAL ANCHOR TRENCH
O r r•r r r r r ......
INTERMI EN CHECK SLOT
♦ �; ° �"'- SINGLE-LAP SPLICED ENDS OR BEGIN NEW
33„ OVE 3"MIN. - ANCHOR 6"X6"MIN.TRENCH ROLL IN AN INTERMITTENT CHECK SLOT The filter fabric shall be fumished with suitable wrapping for protection against
RLAP AND STAPLE AT 12^ moisture and extended ultraviolet prior to placement.
TEMPORARY OR R s"MIN INTERVALS
PERMANENT DITCH 4" Orifice/ OVERLAP FLOW
Th
ROPE -- PREPARE SOIL AND APPLY SEED BEFORE e filter fabric shall meet the following minimum physical requirements:
EMERGENCY SPILLWAY '"inlet
' STAPLE OVERLAPS INSTALLING BLANKETS,MATS OR OTHER It
MAX.S SPACING TEMPORARY CHANNEL LINER SYSTEMS PROPERTY* TEST METHOD REQUIRED VALUE
BRING MATERIAL DOWN TO A LEVEL Tensile Strength ASTM D 4632 400 Newtons 901b
AREA,(TURN THE END UNDER 4" g ( )
COIR FIBER BAFFLES Patent q:gAZ 751 NOTES. AND STfAPLE AT 12"INTERVALS. Elongation ASTM D 4632 <50%-fabric self supporting
(PRACTICE STANDARD 6.65} STON IE PAD O 1. Lime,fertilize and seed before installation.Planting of shrubs,treess,etc.should occur after installation. >50%-fabric requires Woven
(below skimmer) 3.
PLAN VIEW 2 Slope surface shall be smooth before placement for proper soil contact. �1
� Design velocities exceeding 2 feeVsecond require temporary blankre a ts,mats similar liners to protect seed and soil until vegetation becomes mire$BCkm
WOOD STAKE established.
OR METAL POST 4. Terminal anchor trenches are required at RECP ends and intermittent check slots must be constructed across channels at 25 foot intervals. MAINTENANCE: Apparent Opening Size(AOS)** ASTM D 4751 0.84 millimeter(U.S.Steve$120)
5. Terminal anchor trenches should be a minimum of 12 inches in depth and 6 inches in Width.Intermittent check slots should be 6 inches deep 1. Inspect Rolled Erosion Control Products at least weekly and
and 6 inches wide. after each rainfall of 1.0 inch or greater;repair immediately. Permitivit y ASTM D 4491 0.01 Sec.'
3" hose, ss clamps 6. For installation on a slope,place RECP 2-3 feet over the top of the slope and into an excavated end trench measuring approximately 12 2. Good contact with the ground must be maintained,and Ultraviolet Stability(retained ASTM D 4355 70%
inches deep by 6 inches wide.Pin the RECP at 1 foot intervals along the bottom of the trench,backfill and compact.Unroll the RECP down erosion must not occur beneath the RECP.
3"threaded male nipple 4" inlet 4" HEAD [distance from the slope maintaining direct contact between the soil and RECP.Secure using staples or pins in a 3 foot center-to-center pattern. 3. Any areas of the RECP that are damaged or not in close strength after 500hrs of
7. 11 gauge,at least 6 inch by 1 inch staples or 12 inch minimum length wooden stakes are recommended for anchoring. contact With the ground shall be repaired and stapled.
on outlet end extension center of oiificefinl et to 8. Grass-lined channels with design velocities exceeding 6 feet/secomd should include turf reinforcement mats 4 If erosion occurs due to poorly controlled drainage,the ultraviolet exposure)
9. Check slots to be Constructed per manufacturers specifications. problem shall be fixed and the eroded area protected.
water surface 10. Staking or stapling layout per manufacturers specification. 5. Monitor and repair the RECP as necessary until ground cover
Note: Baffles are to b e equally spaced. 12. If Do
it a trams at the top of Slope,anchor ap-slope of the rmberm. s established. 4. A t in.x t in.trench shall be dug;on the upstream side of the silt fence.
12. Do No stretch than HAY,in rolls
may
be pllow the rolls m conform to alny irregularities. The silt fence shall line the trench and extend u the posts for the remainder
13. For slopes less than 3H:1 V,rolls may be placed in horizontal strips]. P P
of the fabric width. The trench shall then be backfilled and tamped. Silt fence
fabrics shall be spliced together only at supporting posts with a minimum of
prevent
from
(') Coupling can be removed and hose attached to outlet using the threaded nipple. tin. oend. At p and
tmchamannerto,thefabri willbpreectedifitha
g between
Basin Maintenance p g g p p the two ends. At the time of installation,the fabric will be rejected if it has any
defects,deterioration,or other damage incurred during manufacture,
Inspect skimmer sediment basins at least weekly and after each significant(one half inch Attach directly to metal riser ensuring a water tight connection.
transportation,or storage.
or greater)rainfall event and repair immediately. Remove sediment and restore the basin
Silt Fence Maintenance Considerations
to its original dimensions when sediment accumulates to one-half the height of the first
baffle.Pull the skimmer to one side so that the sediment underneath it can be excavated. Note: SC H 40 solid PVC barrel/arm should be between 6' and 10' in length. 1. Inspect silt fences at least once a week and after each rainfall. Make any required repairs immediately.
Excavate the sediment from the entire basin,not just around the skimmer or the first cell.
Make sure vegetation growing in the bottom of the basin does not:hold down the Note: Design Flow Rate for 2" Skimmer: 0.038 cfs 2. Should the fabric of a sediment fence collapse,tear,decompose or become ineffective,replace it promptly.
skimmer. Note: Design Flow Rate for 2.5" Skimmer. 0.072 cfs 3. r Remove the sediment deposits as necessary to provide undermining
storage during for the next rain and to
reduce pressure on the fence. Take care to avoid undermintn the fence during cleanout.
Repair the baffles if they are damaged.Re -anchor the baffles if water is flowing Note: Design Flow Rate For 3" Skimmer. 0.11 efs 4. Remove all fencing materials and unstable sediment deposits and bring the area to grade and stabilize it
underneath or around them. after the contributing drainage area has been properly stabilized.
If the skimmer is clogged with trash and there is water in the basin[,usually jerking on the Note: Design Flow Rate For 4" Skimmer: 0.23 cfs
rope will make the skimmer bob up and down and dislodge the debris and restore flow.If Note: Flow rates are from Faireloth product cut sheets.
this does not work,pull the skimmer over to the side of t he basin and remove the debris.
Also check the orifice inside the skimmer to see if it is clogged;if so remove the debris. ROAD CROSSING AT WETLAND OR STREAM CROSS-SECTION
If the skimmer arm or barrel pipe is clogged,the orifice can be removed and the
obstruction cleared with a plumber's snake or by flushing with water.Be sure and replace
the orifice before repositioning the skimmer.
Check the fabric lined spillway for damage and make any required repairs with fabric that
spans the full width of the spillway.Check the embank ment,spillways,and outlet for
erosion damage,and inspect the embankment for piping and settlement.Make all
Existing Culvert
necessary repairs immediately.Remove all trash and other debris from the skimmer and
pool areas. 11=11=11=11=11=11=11=11=11=11=11=11=11=11=11=11=11=11=11=11=11=11=11=11=11=11=11=11=11=11=11=11=11=11=11=11=11=11=11=11=11=11=11=11=11=11=11=11=11=11=11=11=11=11=11=11=11=11=11=11=II=11=
42 _
r
Collection Berm Specifications Collection Berm Maintenance
Proposed Sediment Basin Calculations Design Elevations ft. EL 1. Construct berm by placement of overburden. 1. Inspect beerms at least weekly and after each rainfall of 1 inch or greater.
Surface Area at normal pool], Skimmer Width of Inlet Outlet 2. Prior to placement of materials for berm formation,cut vegetation
Point Inflow square ft. Storage Volume, Cubic Ft. (3) To of Crest of To of 25- r 24-hr near] flush with round if applicable).
2. Immediately remove any obstruction from the flow area,and repair the diversion ridge.
g Inlet & Draw Down Height of Secondary Imvert of Invert of p P 2-yr 24-hr 10-yr 24-hr Y Y g
Watershed Weighted Riser Dia., Barrel Dia., g Seconder Berm 3.Maintain the ve etatiioin in a vigorous,heallth condition at all times.
Area Average Te, (1) (2) Area (2) Orifice, Time, hours Spillway, Horizontal Horizontal Riser Y Storm Elev. Storm Elev. Storm Elev. 3. Compact materials in 1ft.lifts by construction traffic. g g Y
Diseh. Basin g Q , cfs Required Providedd Dist., acre Required Provided inches inches Berm, ft. Spillway
(acres) CN minutes 1 o q q inches ft. Pie Pipe P Y
4. Revegetate berm the same day constructed.
1 1 35.8 77 171.6 26.48 11,519 14,792 14.7 26,460 268,756 3 66.8 1811 12" 3.5 10 99.0 98.5 102.0 102.5 103.6 101.6 102.3 102.6
2 2 10.9 86 54.4 24.86 10,814 12 13, 2 10.9 19,620 203,334 3 49.5 18" 12" 3.5 10 99.0 98.5 102.0 102.5 103.5 101.2 101.6 102.0
1312 SOIL BERM CROSS-SECTION ENGINEERING & ENVIRONMENTAL DATE:
3 3 27.1 86 43.8 72.15 31,385 (31 72s 27.1 48,780 283,008 4 58.9 18" 12" 3.5 10 99.0 98.5 102.0 102.5 103.5 101.6 102.2 102.4 2 C SCIENCE COMPANY 08/11/23
4 4 39.5 86 68.8 75.88 33,008 33,800 39.5 71,100 126,778 4 85.9 18" 12 4.4 30 99.0 98.5 102.0 102.7 104.4 102.7 103.2 103.4 3 Raleigh, NC 27609
f� 3008 Anderson Drive DRAWN:
260'x130'
(1) Required Surface Area is based on 435 sf per cfs of Q10 peak inflow 2 2 (919) �g 1-��9s TPS
I 1 3.5'to 4.5'
(2) Required Volume is based on 1800 cf/ac. of disturbed area REVISED:
�t,�tgl a 1I IIII�rrtrir 07/26/24
(3) From normal pool to top of berm ��� �.. CAIp From11=11=11=11=11=11=11=11=11=11=11=11=11=11=11=11=11=11=11=11=11=11=11=11=11=11=II=11=11 � O� '" ' " Ali''%
�;. pFEssip�.�'�� EROSION CONTROL DETAILS SCALE:
Zff`` = NTS
L5472 s
.,, TOISNOT PIT Sleet No.
�' '` NG HWY 222
STANITONSBURG, NC D-1
'"""' WILSON COUNTY