NCC204947_MODIFICATION Supporting Documents_20221115 (3)

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CONSTRUCTION SEQUENCE
STAGE 1
1. SCHEDULE A PRE -CONSTRUCTION CONFERENCE WITH JOHNSTON COUNTY PUBLIC
UTILITIES.
( _ N/ 1 l / / 2. AFTER THE PRE -CONSTRUCTION MEETING IS HELD, THE CONTRACTOR CAN DELINEATE
\163802-58-)66 THE TREE LINE / DISTURBANCE LIMIT LINE AND INSTALL INITIAL EROSION CONTROL
(OHN JOHNSJN I I / % / / / / / / / / MEASURES ONLY. THIS INCLUDES, BUT IS NOT LIMITED TO, CONSTRUCTION ENTRANCE,
D 1902 PG 9 � — — — � /
/ / / / SILT FENCE/TREE PROTECTION FENCE, TEMPORARY SKIMMER BASINS, TEMPORARY
RISER BASIN #3, AND EXISTING INLET PROTECTION. PERMANENT POND #4 (TRB#3) WILL
/ / \ \ I / / I REMAIN A TEMPORARY RISER BASIN THROUGH CONSTRUCTION OF THESE PHASES.
/ / / // \ \ I I / I / I / 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. INSTALL SUBSURFACE DRAINAGE Cl 78A, Cl 78 TO EXISTING Cl 14 FOR
OUTLET OF SKB-3. ONCE PERMANENT POND 3 BASIN IS COMPLETED, INSTALL
//
\ / / / \ l I I \ / / � �� SUBSURFACE PIPING FROM FES 20C TO MH 20B JUST SHORT OF MH 2OA. 30" RCP TO BE
ALL 3,[y, / / / / / / / INST STLT _ _ I I I \ \ I / �� EXTENDED AS TEMPORARY INLET FOR POND 3. INSTALL DIVERSION BERM TO DIRECT
ASS /� KIPR IF�BA FLEE INALI/CLA�S B/ F CE (TYP.) 2 \ I \ \ I I I \ I I / / / / / UPSTREAM FLOW TO 30" RCP TO POND 3 ALONG WITH ALL OTHER TEMPORARY
-RET�IFORC / \ / �TOI�4E RIPr>`2A j / / / / / / / \ DIVERSIONS.
/ /( / / / / / / / / \ \ \ \ \ / I 1 / / / / / 3. LIMIT CLEARING AND LAND DISTURBING ACTIVITY TO ONLY THE AREA NECESSARY TO
TALLY / / / n / / / / / \ INSTALL THE PERMITTED MEASURES.
/ / / / / / \ I \ \ I / I / / 4. CALL JOHNSTON COUNTY PUBLIC UTILITIES FOR AN ONSITE INSPECTION TO CONTINUE
/RE.NV ORCED / J / / I / / / \ I \ I I 1 I I // CONSTRUCTION.
O(1 5. UPON APPROVAL OF THE STORMWATER SITE INSPECTION, COMMENCE PERMITTED LAND
/ / / / �/ \ I I I I / N DISTURBING ACTIVITY - CLEARING AND GRUBBING FOR STAGE 1. ALL EROSION
IIJST LL ( 15"I 1 I \ / / — �\ ` \ �0 pF x \ I I I I I I I CONTROL MEASURES SHALL BE INSPECTED AND MAINTAINED, IF NEEDED, AT LEAST
JA�JY "I
/SLOPE D,RtAIN I ONCE PER WEEK AND AFTER EVERY RAINFALL EVENT.
_ I
sTAGE1A
/ T? L2'sIL� /
E ((p, / / — — — — — IN TALL�1l24" / I ) \ I I f 1) IN ORDER TO BRING PHASE 3 AREA TO GRADE CONTINUE INSTALLATION OF
/ / / — — INS'fALLSsLASS � 20h / / / OBEDRAIN I I I \ \ I
ZTON RIP RAO / / I ALL cc LLA$S B J I I J ( \ \ SUBSURFACE DRAINAGE FROM 30" RCP TO MH 2OA, Cl 20, Cl 21, Cl 21A, AND FES 21 B.
/ �
fST 1 / / / B-Y / / / / /STIP RAP / / / / ` / / / J I / \ \ \ xl I I \ \ I \ \ I INSTALL HORSESHOE INLET PROTECTION AT FES 21 B. BRING GRADES UP AS
I C / 260 — — / / FREVS4,,
AI2Ek' 269`AC / / / I I / / / \ / \ \ \ APPROPRIATE AND INSTALL TEMPORARY INLET PROTECTION AS STRUCTURES ARE
DI,Sk.AREA�,6,30.A�INSTALLED. INSTALL DIVERSIONS AS NECESSARY TO DIRECT FLOW AS SHOWN ON
2EQ//1,494 SF / / // I I I / / / / \ I / \ \ I \ \ 163802- 7-4894 \ APPROVED PLAN.
/ ffOWEIED.8A // 1.,688 SF i \ \ MORRIS H LIDAY
RfzQUIRED STD 11,3�0 CF —' / h / I I I ' I ` / l _ \ I / \ \ \ \ \ \ \ DB 4930 P 57 \ 2) AT MAIN ENTRANCE TO PHASE 3 OFF OF CORNWALLIS ROAD INSTALL SUBSURFACE
iPROAO D S`T ,AGE 13,920 CF — / ti^ / i I I f l / / \ \ \ \ \ \ \ \ \ \
f(NEf��I0162'(W)x124'(C)xg{D� / o \ / / — — / \ \ X \ \ DRAINAGE AT ENTRANCE FROM Cl 83A, CI83B, MH 83C TO FES 84C. INSTALL
�/�N LL C�i�K / / — — / / / /"�S�kIf�MR 1.9 ORRICE N / / / % I / / / / — — \ \ �/ EXISTING \ \ \ \ \ \ \ \ \ TEMPORARY INLET PROTECTION AS STRUCTURES ARE INSTALLED.
p ) //// /// � 265 � / / 2�0 �//�� i 275�� /���// / // / / I / // INST?LLCH CK/ / — \ \ \ POND
D�M (TYP
T6PORARY DIVERSION 1 \ \ \ • f i
\ \ \ EXI�STII�G - / / / (� ``
772 LF P-3-7�w/3:1 SIDE SLOPES \\ \ \ �/ETLAN
RA Y DIVER�N 5 / / — / / / / / / / / / — ' — — / / — / / NAG DS150 TEMPORA&Y LINER— \ \ \ \ \ � \ • \ � � I / / / / � / / J � J // / /
a� 40% wYl"0:1(L), 3: (� / / / / / / � / 285 / � / — � / /
PES
3j150 TE�PORAY LINE �\ \
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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 II.B (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 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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TEMPORARY DIVERSION DITCH
TEMPORARY SILT FENCE
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REINFORCED SILT FENCE OUTLET
TEMPORARY SILT BAG
INLET PROTECTION
TEMPORARY BLOCK & GRAVEL
INLET PROTECTION
— — — —
LIMIT OF DISTURBANCE
EXISTING TREE LINE
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NEW TREE LINE
TEMPORARY ROCK CHECK DAM
13 CONCRETE WASH AREA
® RIPRAP APRON
VELOCITY DISSIPATOR
NORTH
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 I ec
Sheet No: