NCC204947_MODIFICATION Supporting Documents_20221115 (5)

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CONSTRUCTION SEQUENCE
STAGE 1A
1) IN ORDER TO BRING PHASE 3 AREA TO GRADE AND TO INSTALL BERM CONTINUE
INSTALLATION OF SUBSURFACE DRAINAGE FROM 30" RCP TO MH 2OA, Cl 20, Cl 21, Cl
21A, DI 21 B, AND FES 21 C. INSTALL HORSESHOE INLET PROTECTION AT NEW FES 21 C.
BRING GRADES UP AS APPROPRIATE AND INSTALL TEMPORARY INLET PROTECTION
AS STRUCTURES ARE INSTALLED. INSTALL DIVERSIONS AS NECESSARY TO DIRECT
FLOW AS SHOWN ON APPROVED PLAN.
2) INSTALL NEW DI 1AAND FES 1B IN ORDER TO PROVIDE DRAINAGE FOR INSTALLATION
OF LANDSCAPE BERM. INSTALL HORSESHOE INLET PROTECTION AS NEEDED.
3) AT MAIN ENTRANCE TO PHASE 3 OFF OF CORNWALLIS ROAD INSTALL SUBSURFACE
DRAINAGE AT ENTRANCE FROM Cl 83A, C183B, MH 83C TO FES 84C. INSTALL
TEMPORARY INLET PROTECTION AS STRUCTURES ARE INSTALLED.
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
1
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 N�F�X_- D THREE (3) TO ONE (1).
TOTAL DISTURBED SOIL AREA IS 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
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INLET PROTECTION
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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:
ACS
Checked:
AJF
Project No.
1 27-239
Computer Dwg. Name
1 27-239 ph2-4 stage I a ec
Sheet No:
aA
Of 41