NCC204947_MODIFICATION Supporting Documents_20221115 (8)

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CONSTRUCTION SEQUENCE
STAGE 1
1. SCHEDULE A PRE -CONSTRUCTION CONFERENCE WITH JOHNSTON COUNTY PUBLIC
UTILITIES.
2. AFTER THE PRE -CONSTRUCTION MEETING IS HELD, THE CONTRACTOR CAN DELINEATE
THE TREE LINE / DISTURBANCE LIMIT LINE AND INSTALL INITIAL EROSION CONTROL
MEASURES ONLY. THIS INCLUDES, BUT IS NOT LIMITED TO, CONSTRUCTION ENTRANCE,
SILT FENCE/TREE PROTECTION FENCE, AND EXISTING INLET PROTECTION. ONCE THE
SILT FENCE IS SECURE, DRAIN THE EXISTING PONDS WITH PUMPS AND HIGH -FLOW SILT
BAGS. ONCE PONDS HAVE BEEN DRAINED, INSTALL TEMPORARY STONE COFFER DAMS
AND BYPASS SYSTEMS TO ENSURE DRY WORKAREAS. RECONSTRUCT AND EXCAVATE
TRB-3 AND FILL IN THE PORTIONS OF THE OTHER EXISTING POND. ONCE THESE
MODIFICATIONS TO THE EXISTING STRUCTURES ARE COMPLETE, EXCAVATE THE
TEMPORARY RISER BASINS AND THE TEMPORARY SKIMMER BASINS AND ADD THE
FAIRCLOTH SKIMMERS AND THE COIR BAFFLES. ONCE THESE BASINS ARE INSTALLED
AND OPERATIONAL, CONSTRUCT THE TEMPORARY DIVERSION CHANNEUBERM. LIMIT
CLEARING AND LAND DISTURBING ACTIVITY TO ONLY THE AREA NECESSARY TO INSTALL
THE PERMITTED MEASURES.
3. CALL JOHNSTON COUNTY PUBLIC UTILITIES FOR AN ONSITE INSPECTION TO CONTINUE
CONSTRUCTION.
4. UPON APPROVAL OF THE STORMWATER SITE INSPECTION, COMMENCE PERMITTED LAND
DISTURBING ACTIVITY - CLEARING AND GRUBBING FOR STAGE 1. ALL EROSION
CONTROL MEASURES SHALL BE INSPECTED AND MAINTAINED, IF NEEDED, AT LEAST
ONCE PER WEEK AND AFTER EVERY RAINFALL EVENT.
STAGE 2
1. BEGIN ROUGH GRADING OF SITE.
2. BEGIN ROAD WIDENING AND INSTALL THE ASSOCIATED SUBSURFACE DRAINAGE
SYSTEM.
3. ONCE ROUGH GRADES ARE ESTABLISHED, INSTALL THE SUBSURFACE DRAINAGE AND
OTHER INFRASTRUCTURE AS APPROPRIATE AND PROTECT ALL NEW INLETS WITH
TEMPORARY BLOCK AND GRAVEL OR SILT BAG MEASURES AS SHOWN.
4. FILL AROUND SKIMMER BASINS AS STORM DRAINAGE BECOMES OPERATIONAL AND
DIRECTS DRAINAGE INTO THE RISER BASINS. MAINTAIN CONTROLLED FLOW WITH THE
24" SLOPE DRAINS AS SHOWN.
5. STABILIZATION IS REQUIRED WITHIN 14 CALENDAR DAYS OF COMPLETION OF ANY PHASE
OF GRADING OR INACTIVITY ON PROJECT SITE.
6. ONCE ALL SUBGRADES HAVE BEEN ESTABLISHED, INSTALL SANITARY SEWER SERVICES
AND THE PROPOSED WATER MAINS AND SERVICES. ONCE ALL UTILITIES HAVE BEEN
INSTALLED, FINISH FINE GRADING OF SITE AND INSTALL CURB AND GUTTER AND PAVING.
7. STABILIZATION IS REQUIRED WITHIN 14 CALENDAR DAYS OF COMPLETION OF ANY PHASE
OF GRADING OR INACTIVITY ON PROJECT SITE.
8. SITE STABILIZATION IS REQUIRED PRIOR TO FINAL APPROVAL OF GRADING PERMIT AND
ISSUANCE OF CERTIFICATE OF OCCUPANCY. GRASS UTILIZED AS PERMANENT GROUND
COVER MUST BE AT A MOWABLE HEIGHT THAT GENERALLY PROVIDES AT LEAST 80%
COVERAGE THROUGHOUT THE SITE, WITH NO LARGE BARE PATCHES OR EVIDENCE OF
EROSION. ONCE THE SITE HAS BEEN STABILIZED AND INSPECTED, CONVERT THE
TEMPORARY RISER BASINS TO PERMANENT WET PONDS WITH THE APPROVAL OF THE
INSPECTOR.
9. WHEN VEGETATION HAS BECOME ESTABLISHED, CALL FOR A FINAL SITE INSPECTION BY
THE JOHNSTON COUNTY PUBLIC UTILITIES. OBTAIN A CERTIFICATE OF COMPLETION.
GROUND STABILIZATION "
SITE AREA
STABILIZATION
STABILIZATION TIME
DESCRIPTION
TIME FRAME
FRAME EXCEPTIONS
Perimeter dikes,
swales, ditches
7 days
None
and slopes
High Quality
Water (HOW)
7 days
None
Zones
Slopes steeper
7 days
If slopes are 10' or less in length and
than 3:1
are not steeper than 2:1, 14 days allowed
Slopes 3:1 or
14 days
7-days for slopes greater
flatter
than 50-feet in length
All other areas
None
with slopes flatter
14 days
(except for perimeters and
than 4:1
HOW Zones)
* "Extensions of time may be approved by the permitting authority based on weather
or other site -specific conditions that make compliance impracticable." (Section ILB (2)(b)
BASIN REMOVAL SEQUENCE
1. SCHEDULE A SITE MEETING WITH THE ENVIRONMENTAL INSPECTOR TO DETERMINE IF A
BASIN CAN BE REMOVED. INSTALL SILT FENCING OR OTHER TEMPORARY EROSION
CONTROL MEASURES AS NEEDED PRIOR TO REMOVAL OF THE BASIN.
2. REMOVE BASIN(S) AND ASSOCIATED TEMPORARY DIVERSION DITCHES. IF CULVERT PIPES
NEED TO BE EXTENDED, PERFORM THIS OPERATION AT THIS TIME. FINE GRADE AREA IN
PREPARATION FOR SEEDING.
3. PERFORM SEEDBED PREPARATION, SEED, MULCH AND ASPHALT TACK ANY RESULTING
BARE AREAS IMMEDIATELY.
4. INSTALL VELOCITY DISSIPATORS AND/OR LEVEL SPREADERS AS REQUIRED ON THE
EROSION CONTROL PLAN.
5. WHEN SITE IS FULLY STABILIZED, CONTACT ENVIRONMENTAL INSPECTOR FOR APPROVAL
OF REMOVING REMAINING TEMPORARY EROSION CONTROL MEASURES AND ADVICE ON
WHEN SITE CAN BE ISSUED A CERTIFICATE OF COMPLETION.
EROSION CONTROL NOTES
ALL CONSTRUCTION SHALL BE IN ACCORDANCE WITH STATE AND LOCAL REQUIREMENTS.
SUFFICIENT EROSION CONTROL PRACTICES MUST BE INSTALLED AND MAINTAINED TO
RETAIN SEDIMENT WITHIN THE BOUNDARIES OF THE SITE. GROUND COVER STABILIZATION
SHALL BE IN ACCORDANCE WITH NPDES PERMIT AND STABILIZATION CHART ABOVE.
TEMPORARY GROUND COVER WILL BE INSTALLED ON ALL EXPOSED SLOPES IN 7 OR 14
DAYS.
MAINTENANCE: ALL EROSION AND SEDIMENT CONTROL PRACTICES TO BE INSPECTED
WEEKLY AND AFTER EVERY RUNOFF PRODUCING RAINFALL EVENT. NEEDED REPAIRS WILL
BE MADE IMMEDIATELY.
MAXIMUM GRADED SLOPE SHALL NOT EXCEED THREE (3) TO ONE (1).
TOTAL DISTURBED SOIL AREA 1 45 ACRES.
STOCKPILE NOTES:
1. HEIGHT SHALL NOT EXCEED 35 FEET.
2. SLOPES SHALL NOT EXCEED 2:1
STOCKPILE MAINTENANCE REQUIREMENTS
1. SEEDING OR COVERING STOCKPILES WITH TARPS OR MULCH IS REQUIRED AND WILL REDUCE EROSION
PROBLEMS. TARPS SHOULD BE KEYED IN AT THE TOP OF THE SLOPE TO KEEP WATER FROM RUNNING
UNDERNEATH THE PLASTIC.
2. IF A STOCKPILE IS TO REMAIN FOR FUTURE USE AFTER THE PROJECT IS COMPLETE (BUILDERS, ETC.), THE
FINANCIAL RESPONSIBLE PARTY MUST BE NOTIFY WAKE COUNTY OF A NEW RESPONSIBLE PARTY FOR THAT
STOCKPILE.
3. THE APPROVED PLAN SHALL PROVIDE FOR THE USE OF STAGED SEEDING AND MULCHING ON A CONTINUAL
BASIS WHILE THE STOCKPILE IS IN USE.
4. ESTABLISH AND MAINTAIN A VEGETATIVE BUFFER AT THE TOE OF THE SLOPE (WHERE PRACTICAL).
EROSION CONTROL LEGEND
DITCH
TEMPORARY SILT FENCE
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ING?P'� TEMPORARY BLOCK & GRAVEL
INLET PROTECTION
- - - - LIMIT OF DISTURBANCE
EXISTING TREE LINE
NEW TREE LINE
TEMPORARY ROCK CHECK DAM
13 CONCRETE WASH AREA
RIPRAP
NORTH ® VE OCI YPRON DISSIPATOR
60' 0 60' 120'
SCALE: 1 " = 60'
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CE GROUP
301 GLENWOOD AVE. 220
RALEIGH,NC 27603
PHONE. [phone]
FAX [phone]
www.cegroupinc.com
License # C-1739
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Date:
MARCh 3 1 , 2021
Scale:
I"=Ga
Drawn:
RJ h
Checked:
AJF
Project No.
1 27-239
Computer Dwg. Name
1 27-239 ph2-4 stage 2 ec
Sheet No:
12
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