SW8951020_APPROVED PLANS_19960626

STORMWATER DIVISION CODING SHEET
POST -CONSTRUCTION PERMITS
PERMIT NO.
SW8 q 5 10 20
DOC TYPE
❑ WCURRENT PERMIT
APPROVED PLANS
❑ HISTORICAL FILE
❑ COMPLIANCE EVALUATION INSPECTION
DOC DATE
19 9 b O 6 26
YYYYMMDD

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:LAUS MAINTEN CE i°✓ 1 2,- PL 5.`Y 2 S9 58;
FACILITY
POA MAINTENANCE 53 I20 6 _- � 57
.'I 40 �' 22 i` . ,
ILITY .'52' 7,2t � .�19 . F i5fi i
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l7 ' � 79 � 2J 8 � 1B,' 17
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MARSH 46 76 24, ' 9 - I
55
HARBOR PL. 45 'U 3 35 �25 �yBF �10 ill i12i17i1<'15�16 SVQ
CONSERVATION 43 a2, SEC' a®� 2627 36i 3
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CONSTRUCTION SEQUENCE
MAINTENANCE PLAN
1.
OBTAIN EROSION CONTROL PERMIT, SCHEDULE A PRECONSTRUCTION CONFERENCE WITH
1,
ALL EROSION AND SEDIMENT CONTROL PRACTICES WILL BE CHECKED FOR STABILITY AND -
NEW HANOVER COUNTY EROSION CONTROL INSPECTOR AT [phone].
OPERATION FOLLOWING EVERY RUNOFF -PRODUCING RAINFALL BUT IN NO CASE LESS THAN ONCE LANDFALL ASSOCIAT
2.
INSTALL TEMPORARY GRAVEL CONSTRUCTION ENTRANCE/EXIT NEXT TO EXISTING ACCESS
EVERY WEEK. ANY NEEDED REPAIRS WILL BE MADE IMMEDIATELY TO MAINTAIN ALL PRACTICES
ACROSS FROM SUN RUNNER DRIVE.
AS DESIGNED.
3.
BEGIN EXCAVATION OF THE PHASE 1 PORTION OF THE PROPOSED WATER QUALITY POND/
2•
THE SEDIMENT BASIN WILL BE CLEANED OUT WHEN THE LEVEL OF SEDIMENT REACHES 2 FEET / `-
TEMPORARY SEDIMENT BASIN AND INSTALL A TEMPORARY CMP PERFORATED RISER W/ TRASH
BELOW THE TOP OF THE RISER. GRAVEL WILL BE CLEANED OR REPLACED WHEN SEDIMENT l/
GUARD AND ANTI-VOTEX PLATE ALONG WITH STORM DRAINAGE PIPING INTO EXISTING STORM
POOL NO LONGER DRAINS PROPERLY.
DRAIN MANHOLE.
3.
SEDIMENT WILL BE REMOVED FROM THE SEDIMENT TRAP AND BLOCK AND GRAVEL INLET DEVICE
4.
PLACE SILT FENCE AROUND THE PERIMETER OF THE POND EXCAVATION SPOIL AREA AT THE
WHEN STORAGE CAPACITY HAS BEEN APPROXIMATELY 50% FILLED. GRAVEL WILL BE CLEANED
NORTH END OF THE PROJECT. CONTINUE EXCAVATION OF THE PROPOSED WATER QUALITY
OR REPLACED WHEN THE SEDIMENT POOL NO LONGER DRAINS PROPERLY.
POND, INCLUDING PHASE II PORTION, AND DEPOSIT MATERIAL IN POND EXCAVATION SPOIL AREA
4.
SEDIMENT WILL BE REMOVED FROM BEHIND THE SEDIMENT FENCE WHEN IT BECOMES ABOUT
AND IN EXISTING DITCHES OUSIDE OF WETLANDS. MATERIAL SHALL BE PLACED IN 12" LIFTS
0.5 FEET DEEP AT THE FENCE. THE SEDIMENT FENCE WILL BE REPAIRED AS NECESSARY
AND COMPACTED TO 95% OF STANDARD PROCTOR.
TO MAINTAIN A BARRIER.
5.
INSTALL TEMPORARY GRAVEL CONSTRUCTION ENTRANCE/EXITS AT THE TWO REMAINING
5.
ALL SEEDED AREAS WILL BE FERTILIZED, RESEEDED AS NECESSARY, AND MULCHED
51
- ----- - - -
54
i
i
i
MAP BOOK 29
PAGE 189 i
i
COMPLETED AND NOT SUBJECT TO FUTURE DISTURBANCE.
9. REMOVE SILT FROM TEMPORARY SEDIMENT BASIN AND INSTALL PERMANENT OUT STRUCTURE.
10. CALL [phone] TO SCHEDULE A FINAL INSPECTION WHEN ALL AREAS ARE STABILIZED.
C621 S " f SPECIAL NOTE EAR �Ir FOR GaF COURSE
s 22 /
NO FILL MATERIAL SHALL BE PLACED ON WETLAND AREAS UNTIL DRAINAGE AND IRRIGATION MANS
�9
e �
APPROPRIATE PERMITS HAVE BEEN RECEIVED FROM THE U.S. �j��! 9 O CB22 , NQl� �/
CORPS OF ENGINEERS. N? R `(� 17
sroN[ CHECK CB16 ,/ . - \ C819 ..
DAMj /
7 GB18 /
18
i
49
/ 50
\ MAP BOOK 30
PAGE 195
DESIGNATED CONSTRUCTION ENTRANCE LOCATIONS DESIGNATED ON THE DRAWING. ACCORDING TO SPECIFICATIONS IN THE VEGETATIVE PLAN TO MAINTAIN A VIGOROUS, 14 \�
6. BEGIN ROADWAY CONSTRUCTION ALONG WITH THE INSTALLATION OF THE STORM DRAINAGE DENSE, VEGETATIVE COVER.
SYSTEM. PUT BLOCK AND GRAVEL DROP INLET PROTECTION DEVICES AROUND CATCH BASINS.
7. ADDITIONAL MEASURES MAY BE REQUIRED IF THE EROSION CONTROL INSPECTOR DETERMINES 13 15 J
THAT FILED CONDITIONS DIFFER SIGNIFICANTLY FROM DESIGN ASSLMPTIONS. ANY SUCH
MEASURES SHALL BE COORDINATED WITH THE EROSION CONTROL
8. AND THE CONTRACTOR.
EEDING FOR AREAS UNDER CONSTRUCTION INSPECTOR, THE ENGINEER, — !/
THAT WILL BE IDLE FOR 12
OVER THIRTY (30) DAYS. APPLY PERMANENT SEEDING (OR SODDING) TO AREAS THAT ARE 16
i
TIE TO NC GRID MON. 'FAYE` / - - -CB9 —\ STMH 6 + - � 1 SELECT MATERIAL AND E - y - - - -� 1
S 69'18'39" w, 5131.44• // .ti PROPOSED - .ROAD. AND. POND.
E = 2,354,4 009 \ 44 WATER QUALITY _ PROCTOR (TYICTED P) 95% STAN A c_
Z EXCAVATION
POND SPOIL AREA...
CONTROL CORNER - CBS DOSITIVE DRAINAGE
35 36 I WAR S ROAD "A" `. �2 6..
E - 2,359,601.41 /V��C]34 \ �' 4I 16.0'
_ NORMAL POOL I ( ) 53 I 1
LEGEND
PROPOSED STORf, DRAIN
♦ FLARED END SECTION SF SILT FENCE
• STORM MANHOLE
R-� CATCH BASIN
BLOCK & GRAVEL INLET PROTECTION
,1 TEMPORARY CONSTRUCTION ENTRANCE/EXIT
PROJuE�) `7 IQ zy
JUL 2 51994
48 FOR PROPOSED WA
QUALITY POND DETA
DWGS. SEE SHT. 10
/j 7 (PHASE 1) _New
r ROPOSED OUTLET URS
STRUCTURE W/ c
INVERTED SIPHON ' - '/ r0ls
\ FOR DE —WATERING
\ - NEW Cp OVER
>, EX. 15 SD PIPE
\ .^ TEMPORARY CONSTRUCTION
-- V' ENTRANCE/EXIT
TEMPORARY CMP PERFORATED RISER WITH #57 STONE AROUND n
-- - BASE TO BE REMOVED UPON SITE STABILIZATION AND APPROVAL.
O�2. PERMANENT OUTLET STRUCTURE SHALL BE INSTALLED AFTER �
REMOVAL OF TEMPORARY CMP PERFORATED RISER. SEE SHEET 10
FOR POND AND OUTLET STRUCTURE GRADING AND DETAILS.
PROPOSED OUTLET I�fl ��
GRAPHIC SCALE STRUCTURE W/
INVERTED SIPHON
60 0 30 60 120 240 FOR DE -WATERING
( IN FEET )
1 inch = 60 fL
¢
REVISED PER NC DIV. OF ENVIRONMENTAL MANAGEMENT
7-24-9'i
REVISED ROADS, UTILITIES AND LOTS PER OWNER REQUEST
PER NEW HANOVER COUNTY ENGINEERING
12-01-55
1
PER CITY OF WILMINGTON
11-21-95
REV. NO.
DESCRIPTION
CAT-
REVISIONS
THE JOHN R. McADAMS COMPANY, INC.
RESEARCH TRIANGLE PARK, NORTH CAROLINA
P.O. BOX 14005 ZIP 27709-4005
[phone]
STORM DRAINAGE AND EROSION CONTROL PLAN
BIRKDALE AT LANDFALL
BLOCK 17A
OWNER:
,2,N CAROC/,,,,,
7-2r WENTWORTH LIMITED PARTNERSHIP
O� ESS/ L '; 1916 INVERNESS LANE
2 �pF 0fv WILMINGTON, NORTH CAROLINA 28405
SEAL v�
15834
NEW HANOVER COUNTY
} NORTH CAROLINA
,�'�•,AAUL LORE o
grnnn+��t WATER AND SEWER DISTRICT
ate:
10/23/95
Scole:
1 "= 60'
awn:
LM.8.
Checked:
R.P.L.
rolec o:
GBT-95000
Sheet No:
3
Of:

43
45
I •
MilLwm
FES 1
INV. 12.
Nr
NIN
FES 11
INV. 13.
I
TOP OF'FOREBAY
EL. 14.80
/ 6:1 (MIN) VEGETATED
SHELF AROUND
PERIMETER OF PONDL'
PROPOSED OUTLET
STRUCTURE W/
INVERTED SIPHON
FOR DE -WATERING
1
36
11 �-
s },
b Il & 9
t 9 b
a
•
�® GRAPHIC; SCALE
I
30 0 15 30 60
Y '
( IN FEET )
1 inch = 30 ft.
120
1 1/2" X 5/16" THK. STEEL
SLATS AT 8" O.C.
PRECAST CONC.
M.H. RISER 9"
6' DIA. TYP
TRASH GUARD DETAIL
N.T.S.
46-
NOTES:
1. CONCRETE FOR COLLAR SHALL BE 3000 PSI MIN. 28 DAYS STRENGTH.
2. COLLAR SHALL BE CONNECTED TO 30" RCP WITH A WATERTIGHT JOINT.
CONCRETE COLLAR DETAIL
6.
-o"
AS o
REQ'D.C)
a
AS
REQ'D.
DET.- 6 FT. DIA, M.H., BASE W
6' DIA. RISER
N.T.S.
TOP OF DAM
EL. 20.5'
INTERIOR SLOPES
PER GRADING PLAN1
N.T.S.
0
TOP OF RISER EL. 17.0'
TEMP. 36" DIA. CMP ,
PERFORATED RISER W/
SPECIFICATIONS: ASTM C 478 — LATEST
AASHTO M 199 — LATEST
NOTES FOR M.H. BASES:
1. CAST OPENING FOR 12" SLIDE GATE OPPOSITE
30" RCP OPENING
2. REINFORCING IN PRECAST MANHOLE RISER AND
BASE TO BE BY MANUF. SPECIFICATIONS AND
SHALL MEET OR EXCEED SPECIFICATIONS ABOVE.
3. PRECAST MANHOLE RISERS TO BE N.C. PRODUCTS
DESIGN OR EQUAL, APPROVED BY ENGINEER.
4. MANHOLE SUPPLIER TO BE RESPONSIBLE FOR
DESIGN OF EXTENDED BASE TO PREVENT
FLOTATION.
5. STEPS TO BE PLACED AT UNIFORM 16" SPACING.
6. INVERTED SIPHON SHALL BE INSTALLED BY CORE
DRILLING HOLE, NUMBER, SIZE AND INVERT AS
SHOWN ON CROSS SECTION OF DAM. NON SHRINK
GROUT SHALL BE APPLIED IN ANY EXCESS SPACE
OUTSIDE SIPHON PIPE.
TRASH GUARD PERMANENT 30" DIA. RCP
60 LF ® 0.42%
NCDOT #57 WASHED ,
STONE FILTER
BARREL INV. IN AT
AgWrOW `1 RISER = 13.45' A
POND BOTTOM
EL. 11.0'
6'L X 6'W X 18" THK. CONC. BASE
ATTACHED TO RISER. BASE PROJECTS
MIN. OF 18" AROUND RISER.
NOTES
1. BASIN DEWATERING SHALL BE ACCOMPLISHED BY A SERIES OF HOLES COVERED
WITH #57 GRAVEL.
2. THE POOL MAY BE DRAINED BY PERFORATING THE LOWER HALF OF THE RISER WITH
1/4" TO 1/2" HOLES APPROX. 3" APART ON THE OUTSIDE -PIPE CORRUGATIONS.
COVER THE PERFORATED SECTION WITH 2 FT. OF GRAVEL (DOT #57 WASHED STONE
IS APPROPRIATE FOR THIS APPLICATION).
3. TRASH GUARD — INSTALL A TRASH GUARD ON TOP OF THE RISER. A FABRICATED
CONE OF STEEL RODS, SPACED 2" APART, FASTENED TO THE TOP OF THE RISER
IS RECOMMENDED.
4. SEDIMENT TO BE CLEANED OUT WHEN SEDIMENT ACCUMULATION REACHES 1' BELOW
WASHED STONE FILTER.
5. WHEN TEMPORARY RISER IS REMOVED, POND IS TO BE RETURNED TO ORIGINAL
GRADES SHOWN. ON GRADING PLAN.
TEMPORARY RISER DETAIL
N.T.S.
- EXIST. STORM MANHOLE
ARBORETUM DRIVE
TOP OF RISER
EL, 17.0'A 1i -
NORMAL POOL
EL. 16.0' = CONC. COLLAR
(SEE DETAIL)
'N r6'D
CON
R
1-3"` PVC INVERTED SIPHON,
UPPER INVERT ELEV. 16.0'
60 LF 30" RCP 0 0.42%
BARREL INV. IN
EL. 13.45'A
FILL W/ GROUT
POND BOTTOM TO EL. 13.4'
EL. 11.0' (BARREL INV. IN)
BASE SHALL BE MIN. 15" THK. INV. EL. 10.89'
W/ AN O.D. OF 7'-8" AND 12,. EX. 10 PVC SS
SHALL INTEGRALLY ATTACHED TYP
TO RISER.
CROSS SECTION OF WATER QUALITY POND OUTLET STRUCTURE
N.T.S.
POND AREAS & VOLUMES
CONTOUR
CONTOUR
ACCUM.
AREA(SF)
VOLUME(CF)
11
24,717
—
12
28,072
26,395
13
31,527
56,194
14
35,086
89,501
15
38,748
126,418
16
46,450
169,017
17
51,735
218,109
18
57,236
272,595
19
62,875
332,650
20
68,579
398,377
REVD. POND PER NC DIV. OF ENVIRONMENTAL MANAGEMENT
07-24-96
REVD. LOTS & ROADS, AND ADDED ROAD NAMES PER OWNER REQUEST
REVISED WATER QUALITY POND AND ROADS "B" & "C"
01-05--96
A
TOP OF RISER ELEV. 17.0'
11-21-95
REV. N0.
DESCRIPTION
DATE
REVISIONS
BARREL INV. OUT = 13.2'
CONCRETE ARCH ENCASEMENT FOR
EXIST. 10" PVC SANITARY SEWER
PIPE. EXTEND CONC. TO 10' EACH
SIDE OF NEW 30" RCP STORM PIPE
ABOVE
THE JOHN R. McADAMS COMPANY, INC.
RESEARCH TRIANGLE PARK, NORTH CAROLINA
P.O. BOX 14005 ZIP 27709-4005
[phone]
J
PROPOSED WATER QUALITY POND AND DETAILS
BIRKDALE AT LANDFALL
BLOCK 17A
G!�
OWNER:
WENTWORTH LIMITED PARTNERSHIP
N CAROZ/.,7"
O9�ES"µ % 1916 INVERNESS LANE
Z �pE 0 y WILMINGTON, NORTH CAROLINA 28405
SEAL g
15834`� NEW HANOVER COUNTY
O°'MGINE, <v; NORTH CAROLINA
' UL °
jhu.n`Rtt WATER AND SEWER DISTRICT
°
ate:
10/13/95
Scale:
1"= 30'
Drawn:
T. M. B.
Checked:
R.P.L.
olec o:
GBT-95000
Sheet No:
10
,Of:-
U