SW1240301_Plansheet - Misc. Detail_20240923 (3)

DATE : PAGE : DATE : PAGE :
OVERCUT CHANNEL PERSPECTIVE VIEW 1 FREEBOARD AT ALL TIMES
OVERLAP 2" EMBANKMENT
6" MIN. TO ALLOW BULKING LONGITUDINAL INFLOW BAFFLES 6" MIN INVERT ELEVATION OF 1
STAKES AT 3'-5' ro DURING SEEDBELGDE
ANCHOR TRENCH "C" ENCLOSURE STRUCTURE JIEMERGENCY SPILLWAY ABOVE BAFFLES
INTERVALS PREPARATION ARM ASSEMBLY
ell
DESITHDEWATERING
WATER ZONE GENESIS ENGINEERING
PVC ELBOW ENTRY UNIT FILTER C O L L A B O R A T I V E
o PVC END PVC VENT PIPE FABRIC
Its CHECK SLOTS AT 25' CAP WATER SURFACE
INTERVALS SCHEDULE STORAGE ZONE SECTION VIEW
SEDIMENT EMERGENCY
SPILLWAY 3360 Martin Farm Road
PVC END PVC PIPE 1/2" 40 PVC PIPE
NOTES: Suite 200
CAP HOLES IN ORIFICE 1. Clear, grub and strip the area under the embankment of all vegetation and root mat. Remove all surface soil Suwanee, Georgia 30024
r PVC UNDERSIDE containing high amounts of organic matter and stockpile or dispose of it properly. Haul all objectionable material 470.375.2001
59
• • PVC PLATE to the designated disposal area. Place temporary sediment control measures below basin as needed.
• TEE TEE CMU BLOCK. SEE 2. Place the fill in lifts not to exceed 9 inches, and machine compact it. Over fill the embankment 6 inches to allow www.genesiseng.net
2"
TYPICAL INSTALLATION FLEXIBLE HOSE NO
TE 12. for settlement.
�� WITH EROSION CONTROL
I s BLANKETS OR TURF 3. Place the barrel on a firm, smooth foundation of impervious soil. Do not use pervious material such as sand,
- REINFORCEMENT MATS e gravel, or crushed stone as backfill around the pipe. Place the fill around the pipe spillway in 4-inch layers and
6"MIN. BOTTOM SURFACE compact it under and around the pipe to at least the same density as the adjacent embankment.
INITIAL CHANNEL ANCHOR TRENCH TERMINAL SLOPE AND CHANNEL 1�,Elj 11. .I ICI I-V
4. Place a minimum depth of 2 feet compacted backfill over the pipe spillway before crossing with construction
ANCHOR TRENCH 11 11INTERMITTENT CHECK SLOT LONGITUDINAL ANCHOR TRENCH END FRONT VIEW equipment.
:::::::::......... VIEW 5. Ensure that the flow length to basin width ratio is at least 2:1 to improve trapping efficiency. Length is
......... measured at the elevation of the principal spillway. ����` �N �ARQ "/i,,
....... SINGLE-LAP SPLICED ENDS OR BEGIN NEW BAFFLES !�
•••••• 6. Assemble the skimmer following manufacturers instructions or as designed and lay on the bottom of the basin `•��O FOSS/ tiq
3 MIN. f ROLL IN AN INTERMITTENT CHECK SLOT with the flexible joint at the inlet of the barrel pipe. Attach the flexible joint to the barrel pipe and position the QUO Ny
OVERLAP ANCHOR 6 X6 MIN. TRENCH
I skimmer over the excavated pit or support. Be sure to attach a rope and anchor it to the side of the basin.This _ -
::... AND STAPLE AT 12 INTERVALS - -
_ will be used to pull the skimmer to the side for maintenance. 9 84
6" MIN. _III Z 7. Install the spillway in undisturbed soil to the greatest extent possible. The spillway should be lined with =
OVERLAP Lu laminated plastic or impermeable geotextile fabric. The fabric must be wide and long enough to cover the
FLOW I I III bottom and sides and extend onto the top y of the dam for anchoringin a trench. The edges may be secured with
PREPARE SOIL AND APPLY SEED BEFORE
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8-inch staples or pins. N.
STAPLE OVERLAPS INSTALLING BLANKETS, MATS OR OTHER III z
••••••• ••• 8. Filter fabric must be long enough to extend down the slope and exit onto stable ground. The width of the fabric
MAX. 5" SPACING TEMPORARY CHANNEL LINER SYSTEMS Q
..........................
pp must be one piece, not joined or spliced; otherwise water can get under the fabric.
..........................
BRING MATERIAL DOWN TO A LEVEL 2: 9. The upper section(s) should overlap the lower section(s) so that water cannot flow under the fabric. Secure the
AREA, TURN THE END UNDER 4 AND I I I Lu upper edge and sides of the fabric in a trench with staples or pins.
STAPLE AT 12 INTERVALS. I INFLOW 10. Discharge water into the basin in a manner to prevent erosion. Use temporary slope drains or diversions with
III III outlet protection to divert sediment-laden water to the upper end of the pool area to improve basin trap STRUCTURE efficiency.
NOTES: 11. Stabilize the emergency spillway embankment and all other disturbed areas above the crest of the principal
1. Lime, fertilize and seed before installation. Planting of shrubs, trees, etc. should occur after installation. I � spillway immediately after construction.
2. Slope surface shall be smooth before placement for proper soil contact. 12. Contractor shall provide and install CMU block(s) to serve as a resting block for the sediment basin skimmer
3. Design velocities exceeding 2 feet/second require temporary blankets, mats or similar liners to protect seed and soil until vegetation becomes established. during low water periods.
4. Terminal anchor trenches are required at RECP ends and intermittent check slots must be constructed across channels at 25 foot intervals.
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 and 6 inches MAINTENANCE: SKIMMER MAINTENANCE:
wide. 1. Inspect Rolled Erosion Control Products at least weekly and DEWATERING 1. Inspect all measures at least weekly and after each rainfall of 1.0 inch or greater. Make necessary repairs
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 inches deep by 6 immediately.
inches wide. Pin the RECP at 1 foot intervals alongthe bottom of the trench, backfill and compact. Unroll the RECP down the sloe maintaining direct contact after each rainfall of 1.0 inch or greater; repair immediately. DEVICE
p p g 2 Good contact with the round must be maintained and 2. Remove sediment and restore the basin to its original dimensions when sediment accumulates to one-half the
.
between the soil and RECP. Secure using staples or pins in a 3 foot center-to-center pattern. g height of the first baffle. Pull the skimmer to one side so that the sediment underneath can be excavated.
7. 11 gauge, at least 6 inch by 1 inch staples or 12 inch minimum length wooden stakes are recommended for anchoring. erosion must not occur beneath the RECP. Excavate the sediment from the entire basin, not just around the skimmer or within the first cell.
8. Grass-lined channels with design velocities exceeding 6 feet/second should include turf reinforcement mats 3. Any areas of the RECP that are damaged or not in close 3. Make sure any vegetation growing in the bottom of the basin does not hold down the skimmer.
9. Check slots to be constructed per manufacturers specifications. contact with the ground shall be repaired and stapled. 4. Repair baffles if they are damaged. Re-anchor the baffles if water is flowing underneath or around them.
10. Staking or stapling layout per manufacturers specification. 4. If erosion occurs due to poorly controlled drainage, the AREA* 5. Ensure the skimmer is not clogged with trash or debris.
11. If there is a berm at the top of slope, anchor up-slope of the berm. AVERAGE WIDTH W 6. If the skimmer arm or barrel pipe is clogged, remove orifice and clear debris with a plumber's snake or by
problem shall be fixed and the eroded area protected. ( L flushing with clean water. Be sure to replace the orifice before repositioning the skimmer.
12. Do not stretch blankets/matting tight, allow the rolls to conform to any irregularities. 5. Monitor and repair the RECP as necessary until round cover 7. Check fabric lined spillway for damage and make an required repairs with fabric that spans the full width of
13. For slopes less than 3H:1V, rolls may be placed in horizontal strips. RECP p g AREA OF BASIN WATER SURFACE AT TOP PLAN VIEW p y g y q p p
is established. EMERGENCY the spillway. Check the embankment, spillways, and outlet for erosion damage, and inspect the embankment
OF PRINCIPAL SPILLWAY ELEVATION SPILLWAY for piping and settlement.
Effective Date: 9/1/2023 Effective Date: 9/1/2023
J RTM 1AROLIN�E Q ROLLED EROSION CONTROL PRODUCTS In accordance with the 2013 NORT"CAROLIN E Q SKIMMER SEDIMENT BASIN In accordance with the 2013
pa„ment of Environmental Quali[y Design Manual Updates oe,a„meat If En�iren--i oaa�'' Design Manual Updates
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DATE : DRAPE BAFFLE MATERIAL PAGE : >_ Q O
OVER WIRE STRAND AND EXTEND 9 GAUGE WIRE TO BASIN SIDE OR INSTALL a Q o 0
SECURE WITH PLASTIC T-POST TO ANCHOR BAFFLE TO SIDE OF BASIN AND U) Zz = a w
TIES AT POSTS AND ON
WIRE EVERY 12" 4' MAX. SECURE TO VERTICAL POST. J J z a
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SANDBAG J
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VARIABLE W Q > _ U
DEPTH ,
o PERMEABLE \�� EARTHEN BERM ( � � W (n
9 GAUGE MIN. HIGH J� Z GEOTEXTILE /\ STAPLE OR CONCRETE PERMEABLE U
TENSION WIRE STRAND = +m FABRIC BLOCK UJ FABRIC TILE Q (D J W
SHALL BE SECURED TO 3' - BAFFLE a = C) LU O
POST TO SUPPORT MIN. MATERIAL o
BAFFLE MATERIAL _ I / j/�, /�\//�//\/� �� W O U_ (J) Q =
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LANDSCAPING NOT TO SCALE PAINTED SECTION B-B O O J N Q
STAPLE
WHITE NOT TO SCALE d � � U = �
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BAFFLE
MATERIAL III=III=III I I III III=III=III=I
LAG SCREWS CONCRETEI I LETTERS REVISIONS
STEEL POST SECURE BOTTOM OF BAFFLE TO I I=III=III=I I I I I III=III=III=III= II WASHOUT
GROUND WITH 12" STAPLES AT WOOD POST
i TENANT REVIEW 05/02/2024
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NOTES: 12" MAXIMUM SPACING NCDEQ SUBMITTAL 09/19/2024
1. Use matting made of 100% coconut fiber(coir) twine woven into high strength matrix. STEEL POST 2'-0" DEPTH o o B
2. Staples should be made of 0.125 inch diameter, new steel wire formed into a '*U' shape not less than 12 inches in A A \ \ \\/�� \ \ \\ \ PERMEABLE w
PERMEABLE ��j//� �/ ��/��//%/ /� GEOTEXTILE m
length with a throat of 1 inch in width. The staples anchor the porous baffles into the sides and bottom of the basin PEOTEXTILE Ld FABRIC
3. Grade the basin so that the bottom is level front to back and side to side. BAFFLE MATERIAL SHOULD BE SECURED TO THE BOTTOM FABRIC a
4. Install the coir fiber baffles immediately upon excavation of the basins. AND SIDES OF BASIN USING 12" LANDSCAPE STAPLES
5. Install posts across the width of the sediment trap. CONCRETE WASHOUT No VARIABLE
6. Steel posts should be driven to a depth of 24 inches and spaced in a maximum of 4 feet apart. The top of the fabric VARIABLE
MAINTENANCE: SIGN (OR EQUIVALENTS EARTHEN
should be a minimum of 6 inches higher than the invert of the spillway. Tops of the baffles should be a minimum of 1. Inspect all measures at least week) and after each BERM OR
p Y NOTES: CONCRETE
2 inches lower than the top of the earthen embankment. rainfall of 1.0 inch or greater and repair O 1. ACTUAL LAYOUT DETERMINED IN THE FIELD. BLOCK
7. Install 3 coir fiber baffles in basins at drainage outlets with a spacing of 1/4 the basin length. 2 coir fiber baffles immediately. 2. SIGNAGE IDENTIFYING THE CONCRETE
can be installed in the basins less than 20 feet in length with a spacing of 1/3 the basin length. 2. Maintain access to baffles. If the fabric collapses, SANDBA WASHOUT AREA SHALL BE INSTALLED WITHIN
8. Attach a 9-gauge high tension wire strand to the steel posts at a height of 6 inches above the spillway elevation 5FT.OF THE WASHOUT FACILITY.
tears, decomposes, or becomes ineffective, replace
with plastic ties or wire fasteners to prevent sagging. If the temporary sediment basin will be converted to a immediately. EROSION CONTROL PLAN LEGEND: ONCRET
permanent stormwater basin of a greater depth, the baffle height should be based on the pool depth during use as WASHOUT PLAN VIEW
3. Remove sediment deposits when it reaches half O O O O O NOT TO SCALE
a temporary sediment basin. full. Replace if baffle fabric is damaged during BERM
clean-out operations. Sediment depth should never PLAN VIEW
exceed half the designed storage depth. NOT TO SCALE CONCRETE WASHOUT DETAIL TYPE "ABOVE GRADE"
TYPE "BELOW GRADE" NOT TO SCALE
DE Q POROUS BAFFLES Effective Date:
In accordance withith the 2013
�I nAROLINA Design Manual Updates
part a (Environmental Quality
PROJECT NUMBER:
21-118
DATE:
02/29/2024
DETAILS