NCG021041_Site Plans 2_20240730

SECONDARY SPILLWAY
SILT FENCE DETAILS
Minimum 12-1/2 Gauge Intermediate Wires
SEDIMENT BASIN W/ SKIMMER DETAIL Minimum 10 Gauge Line Wire
8'MAXIMUM
3 3 (variable as directed by the engineer)
TOP OF EMBANKMENT 1 1 See Basin Schedule
RISER STRUCTURE tit _ See Basin Schedule _
3.'MIN- �,.•r+ ,.,--,, .{, Pipe Connections It nc Fa 'c
TRASH RACK i` L EMERGENCY SPILLWAY vri fro to Grade
FREEBOARD- � �� •- �ft)I-=-W�.�N)d.� -Ensure that all conduit connections are watertight. Rod and
1'MIN- 611t �9k ltil ul 1��=4�1�= 1s- lug type connector bands with gaskets are preferred for corrugated Laminated Plastic LiningOI"
SKIMMER ► a ` Idf llA 1d11 N f uiP 1fN21114112,
)f fl �=O_ �€
�s�° It 6C1� laVl 1�W= 1C1 no 1114Il1C�411m](IM apt metal pipe to assure watertightness under maximum loading and internal Impermeable Geotextile Fabric
�5- 1d1d9Jlfl�`ffl1fflt � 1f p P y p
1I1�=1�1��Hill-i � A .�1ill RIE, 12 � pressure. Do not use dimple (universal) connectors under any
OUTLET PROTECTION DETAILS
I mil '• BARREL
PIPE
Trash guard
-It is important that a suitable trash guard be installed to prevent the riser
and barrel pipes from becoming clogged. Install a trash guard on the o steel Post
CLASS B STONE PAD Woven Wire Fabric
4' X 4'X 1'MIN. CUT-OFF ANTI-SEEP top of the riser to prevent trash and other debris from clogging the conduit. o 0
( 7 ANTIFLOTATION BLOCK SECTIONAL VIEW � TRENCH STABILIZED A combination anti-vortex device and trash guard improves the efficiency o 0�o d�< o� silt Pen eotextile Fabric
COLLAR g P Y o oO o O o/�
OUTLET 4-cam' O.C?.00.O�o3J
2' DEEP of the principal spillway and protects against trash intake.
0 o - � 0 .G o .Q o � Y-0"
1.1 a o c, 9 ft. 26"
Protection against piping CMP Outlet Pip e t 4°Min.
-Install at least one watertight antiseep collar with a minimum projection s O ��4a O�C trade
NOTES of 1.5 feet around the barrel of principal spillway conduits, 8 inches or 3 ft. o� 1 0 C)o �o � s"Minimum Cover over skirt
1. SEED AND PLACE MATTING FOR EROSION CONTROL ON INTERIOR AND EXTERIOR SIDESLOPES. 10.C�10o.0�4 d� 4"Minimum horizontal turn
larger in diameter. Locate the anti-seep collar slightly downstream from - 0
2. INSTALL A MINIMUM OF 3 COIR FIBER BAFFLES IN ACCORDANCE WITH PRACTICE STANDARD 6.+65. I o a � �
the dam center line. A properly designed drainage diaphragm installed O aO 2'-0°
3. INSTALL SKIMMER AND COUPLING TO RISER STRUCTURE OR DIRECTLY INTO EMBANKMENT 1 FT. FROM BOTTOM OF BASIN. around the barrel may be used instead of an anti-seep collar when it is o.d
4.THE ARM PIPE SHALL HAVE A MINIMUM LENGTH OF 6 FT. BETWEEN THE SKIMMER AND COUPLING. r NOT TO SCALE appropriate.
8 ft.
Note: Silt Fence Specifications
Inspect outlet protection structure's weekly and after significant (1/2" or greater) 1.Steel posts shall be a minimum of 5 ft.long,weigh a minimum of 1.31b/ft,and
rainfall events to see if any erosion around or below the riprap has taken place, have projections to aid in fastening the wire or fabric. Steel posts shall also
or if stones have been dislodged. Immediately make all needed repairs to have a metal Plate welded near the bottom such that when the post is driven
prevent further damage. 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,
Class I zinc coating for wire. The fence shall be at least 32 in.high and shall
have at least 6 line(horizontal)wires. Stay(vertical)wires shall be spaced
12 in.apart. The top and bottom wires shall be 10 gage. All other wires shall
Skimmer shown in ry / Aluminum straps DATE: be 12 i/2 gage.
G„ Vent To A11 IT CHANNEL Y
)�+ OVERLAP TO ALLOW BULKING
suspending n 6•MIN. DURING SEEDBED LONGITUDINAL
RISER STRUCTURE floating-Jposition with Orange tip STAKES AT S-5'• p PREPARATION ANCHOR RENCH 3, Filter Fabric shall be composed of fibers consisting of long chain synthetic
INTERVALS
horizontal intake } polymers composed of at least 85%by weight of polyolefins,polyesters,or
SKIMMER(SIZE VAR.) OESIGA DEPTH
STEEL POSTS(QUANTITY VAR,.) n polyamides. The fibers shall be formed into a network such that the filaments
4" Sch 40 4' pvc float 4 -I or yarns retain dimensional stability relative to each other. The filter fabric shall
EMBANKMENT r be free of any treatment or coalting which might adversely alter its physical
"<( Coupling CHECK SLOTSAT
-
PLASTIC SLOPE DRAIN PIPE / STONE ENERGY Connection 26 INTERVALSproperties after installation. Tlhe fabric shall be free of defects or flaws which
(PRACTICE STANDARD 6.32) h DISIPATOR 33" - - - - - significantly affect its physical and/or filtering properties. The fabric shall have
a minimum width of 36 inches;.
OR 3" Sch 40 SOLID pvc barrel 1�"`� 12, r T PIe LLINSTAUAT ON
GEOTEXTILE LINING e .l wrtH ERTS ORDNTRO
Or arm" awNxe soRTURF The filter fabric shall be furnislhed with suitable wra in for protection against
REINFORCEMErm MATS PP g g"P
6 MIN
INITIAL CHANNEL ANCHOR TRENCH TERMINAL SLOPE AND CHANNEL
SUPPLIED BY USER � � moisture and extended ultraviolet prior to placement.
i v, ❑ - _,•___ AN TRENCH LONGITUDINAL ANCHOR TRENCH
�. ......�.
INTERMITTENT CHECK SLOT
SINGLE-LAP SPLICED ENDS OR BEGIN NEW The filter fabric shall meet the following minimum physical requirements:
.� 3"NdIN. ROLL IN AN INTERMITTENT CHECK SLOT
" OVERLAP ANCHOR 6"X6"MIN.TRENCH
33 ' PROPERTY TEST METHOD REQUIRED VALUE
TEMPORARY OR 1 6"MIN. AND STAPLE AT 12" Q
INTERVALS
PERMANENT DITCH " OVERLAP Tensile Strength ASTM D 4632 400 Newtons(901b)
w ROPE EMERGENCY SPILLWAY __ f l F inletOrifice/ SAP E OVERLAPS INSTAPREPALLING NG BLANKETS,MATS OR OTHER Elongation ASTM D 4632 <50%-fabric self supporting
E SOIL AND APPLY SEED BEFOREFLOW
_ -- MAX.5"SPACING TEMPORARY CHANNEL LINER SYSTEMS 1 50%-fabric requires woven
-^- `-- - I �'-^ BRING MATERIAL DOWN TO A LEVEL _
wire backing
AREA,TURN THE END UNDER 4"
Patent A.5,820,751 AND STAPLE AT 12"INTERVALS. Apparent Opening Size AOS xx ASTM D 4751 0.84 millimeterSieve#20 COIR FIBER BAFFLES �:`.:: � NOTES. PP� P g ( ) � (U.S.( )
PRACTICE STANDARD 6.65 1. Lime,fertilize and seed I before Installation.Planting of shrubs,trees,etc.should occur after installation.
STONE PAD o Permitiviry ASTM D 4491 0.01 Sec:'
2. Slope surface shall be smooth before placement for proper sal contact.
(below skimmer) 3. Design Velocities exceeeding 2 feettsecond require temporary blankets,mats or similar liners to protect seed and soil until vegetation becomes Ultraviolet Stability(retained D 4355 70%
PLAN VIEW
WOOD STAKE established.
4. Terminal anchor trenches are required at RECP ends and intermittent check slots must be amstructed across channels at 25 foot intervals. MAINTENANCE: strength after 500hrs Of
OR METAL POST 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 exposure)
1. Inspect Rolled Erosion Control Products at least weekly and ultraviolet
and 6 inches wide. after each rainfall of 1.0 inch or greater;repair immediately.
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
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. 4 A 6 in X 6 ln trench shall be dug On the upstream side Of the Silt fence.
3"threaded male nipple 4" Inlet 4" HEAD (distance from the slope maintaining direct am . . .tact between the soil and RECP.Secure using staples or pins in a 3 foot center-la-center pattern. 3. Any areas of the RECP that are damaged or not in close g P
7. 11 gauge,at least 6 inclh by 1 inch staples or 12 inch minimum length wooden stakes are recommended for anchoring. contact with the ground shall be repaired and stapled. The Silt fence Shall line the tre1nch and extend up the posts for the remainder
on outlet end extension center of orifieefinlet to 6. Grass-lined channels with design velocities exceeding 6 feel/second should include turf reinforcement mats 4, If erosion occurs due to poorly controlled drainage,the
Note: Baffles are to b e equally spaced. 1 check slots a li layout
per manufacturers speciion. ns problem shall be fixed and the eroded area protected of the fabric width. The trenclh shall then be backftlled and tamped. Silt fence
water surface 10. Staking s stapling layout per manufacturers up-slope
of specification. 5. Monitor and repair the RECP as necessary until ground cover fabrics shall be spliced together only at supporting posts with a minimum of
11. If there is a berm at the Rop of slope,anchor up-slope of the berm. is established. P g Y' PP g P
12. Do not stretch btankets0matting tight,allow the rolls to conform to any irregularities. 6 in.of overly and in Such a manner t0 prevent silt from passing between
13. For slopes less than 3HI:1V,rolls may be placed in horizontal strips. P P P•• g
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,
Basin Maintenance (1) Coupling can be removed and hose attached to outlet using the threaded nipple. transportation,or storage.
Inspect skimmer sediment basins at least weekly and after each significant(one half inch Attach directlly to metal riser ensuring a water tight connection. Silt Fence Maintenance Considerations
or greater)rainfall event and repair immediately. Remove sediment and restore the basin 1. Inspect silt fences at least once a week and after each rainfall. Make any required repairs immediately.
to its original dimensions when(sediment accumulates to one-half the height of the first 2. Should the fabric of a sediment fence collapse,tear,decompose or become ineffective,replace it promptly.
baffle.Pull the skimmer to one side so that the sediment underneath it can be excavated. Note: SC H 401 solid PVC barrel/arm should be between 6' and 10' in length.
Excavate the sediment from the entire basin,not just around the skimmer or the first cell. 3. Remove the sediment deposits as necessary to provide adequate storage volume for the next rain and to
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 reduce pressure on the fence. Take care to avoid undermining the fence during cleanout.
skimmer. 4. Remove all fencing materials and unstable sediment deposits and bring the area to grade and stabilize it
Note: Design Flow Rate for 2.5�� Skimmer: 0.072 cfs after the contributmg drainage area has been properly stabilized.
Repair the baffles if they are damaged.Re-anchor the baffles if water is flowing Note: Design Flow Rate For 3" Skimmer: 0.11 cfs
underneath or around them.
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 the basin and remove the debris.
Also check the orifice inside the skimmer to see if it is clogged;if so remove the debris.
If the skimmer arm or barrel pipe is clogged,the orifice can be removed and the SOIL BERM CROSS-SECTION
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 im
3'
spans the full width of the spillway.Check the embank ment,spillways,and outlet for CONSTRUCTION ENTRANCE/EXIT
erosion damage,and inspect the embankment for piping and settlement.Make all
2 2
necessary repairs immediately.remove all trash and other debris from the skimmer and I I
3.5'
pool areas.
yoo;0, Collection Berm Specifications
1. Construct berm by placement of overburden.
Proposed Sediment Basin Calculations Desi n Elevations ft. EL s �� 2. Prior to placement of materials for berm formation,cut vegetation
Surface Area at normal pool, Skimmer Width of Outlet �a`4 nearly flush with ground(if applicable).
Inflow s uare ft. Storage Volume, Cubic Ft. Inlet
Watershed Weighted g Inlet & Draw Down (3) Secondary Invert of Top of Crest of Top of 2- r 24-hr 10- r 24-hr 25- r 24-hr 4 3. Compact materials in lft.lifts b construction traffic.
Point g Riser Dia., Barrel Dial., Height of Y Invert of Secondary y y y � p y
Area Average Tc, (1) (2 Area Time, hours Spillway,
Discharge Basin acres CN minutes Q1o1 cfs Required Provided Dist., acre Required Provided Orifice, inches inches Berm, ft. Horizontal Horizontal Riser Y Berm Storm Elev. Storm Elev. Storm E,lev.
(acres) q 9 inches ft. Pie Pipe Spillway w
¢s
1 1 18.8 86 73.1 34.58 15,042 174'X838 18•8 33,840 195,204 3 85.5 18" 12" 3.5 10 99.0 98.5 102.0 102.5 103.5 101.6 102.2 102.4
8,712 1r 1r ENGINEERING & ENVIRONMENTAL DATE:
2 2 10.8 86 112.1 14.40 6,264 132'x66' 10.8 19,440 295,010 3 49.1 18 12 3.5 10 99.0 98.5 102.0 102.5 103.5 101.0 101.3 101.6 1 � SCIENCE COMPANY 08/11/23
3 3 28.6 g6 g6•g 46.23 20,110 24,200 28"6 51,480 257,997 4 62.2 i 8" 1211 3.5 10 99.0 98.5 102.0 103.5 101.8 102.2 102.5 Notes: 3008 Anderson Drive
102.5
(220 x110') DRAWN:
1. Clear the entrance/exit area of all vegetation,roots and other objectionable material. Raleigh, NC 27609
4 4 9.0 86 25.6 33.94 14,764 14,X$s 9.0 16,200 129,016 2.5 62.5 1811 12" 3.5 10 99.0 98.5 102.0 102.5 103.5 101.4 102.0 102.1 2. Place 2 3"coarse aggregate. [phone] TPS
5 7.4 86 25.2 28.18 12,258 12,800 7.4 13,320 74,752 2•5 51.4 1811 1211 3.5 10 99.0 98.5 102.0 102.5 103.5 101.6 102.1 102.2 3. Maintenance Considerations:Maintain the gravel pad in a condition to prevent REVISED:
mud or sediment from leaving the construction site. This may require periodic `\\\\�111f111I»JJ/J/p 07/25/24
6 6 17.4 8C 31.0 58.35 25,382 26,450 17.4 31,320 145,360 3 79.1 18" 12 3.5 10 99.0 98.5 102.0 102.5 103.5 101.9 102.3 102.5 topdressing with 2-inch stone. After each rainfall,inspect any structure used to `e���� ��lt H CARo �
trap sediment and clean it out as necessary. Immediately remove all objectionable 0 �Q�ESS'�0•.,w/1,�� EROSION CONTROL DETAILS SCALE:
materials spilled,washed,or tracked onto public roadways. : Q `r�!� NTS
4. See Sheet 1 For locations - SUr
(1) Required Surface Area is based on 435 sf per cfs of Q10 peak inflow DUNNIE HOLE MINE sI>r�anv .
( ) Required uired Volume is based on 1800 cf/ac. of disturbed area i'O'• Z�` NC HWY 222
(3) From normal pool to top of berm V, •SHiI� �``��
'`'JJ»IIIIIIII►►�\`` STANTONSBURG NC -1
WAYNE COUNTY