SW8970855_COMPLIANCE_20000908

STORMWATER DIVISION CODING SHEET
POST -CONSTRUCTION PERMITS
PERMIT NO.
SW 9'I %O�,SS
DOC TYPE
❑CURRENT PERMIT
❑ APPROVED PLANS
❑ HISTORICAL FILE
COMPLIANCE EVALUATION INSPECTION
DOC DATE
YYYYMMDD

RECEIVED
SEP 0 8 2000
DW PROD # 5W� q � 55
WET POND REQUIREMENTS
DRAINAGE AREA = ACRES / SF
WETLANDS = ACRES / SF
TOTAL AREA = ACRES / SF
IL I l r r
SE AL
• 13301
r l i l l% l tf'*
16
6.4263 ACRES/279,929 SQ FT
IMPERVIOUS AREA IN SQUARE FEET:
0.8937 ACRES/ 38,930 SQ FT
7.3200 ACRES/ 318,859 SQ FT
ON -SITE BUILDINGS
= 43,862
ON -SITE STREETS
= 68,863
ON -SITE PARKING
= 36,960
ON -SITE SIDEWALKS
= 1,986
TOTAL .......................................
= 1511671
PERCENT IMPERVIOUS (1) = 151,671- 279,928 = 0.54+% THEREFORE USE 60%
USING 60 %
POOL DEPTH = 6.01
TSS = 90% (Therefore filter is required)
SAIDA % = 3.4% = (0.034)
MINIMUM REQUIRED SURFACE AREA AT PERMANENT POOL
= 0.034 x 6.4263 ACRES = 0.2185 ACRES = 9,518 SQUARE FEET
MINIMUM REQUIRED VOLUME OF TEMPORARY POOL
(Simple Method -preferred by DWQ)
Rv = 0.05 + 0.009 ( 60 ) = 0.59
VOLUME = (DESIGN RAINFALL=1") * Rv * (DRAINAGE AREA IN ACRES
*SF/AC)
VOLUME = (1" 112 in/ft) x 0.59 x 6.4263 x 43,560 SF/ACRE=13,764 CF

•
SEAL •�
•
' 1330i e
REQUIRED SURFACE AREA (PERMANENT POOL) = 9,5L8=SQRE >�
=.�f,�h; r Nth •��:
REQUIRED VOLUME (TEMPORARY POOL) = 13,764'CUII(F�E�T
ELEVATION
IN FT.
LENGTH
WIDTH
PP
SF
SUB TOTAL
CF
TOTAL
CF
0
-4
110
10
1,100
2,828
2,828
-2
134
34
4,556
6,860
9,688
0
158
58
9,164
12,044
21,732
2
182
82
14,924
FOREBAY =
20% OF
21,732
=
4,347 CF
REQUIRED
ACTUAL VOLUME OF FOREBAY IS 4380 CUBIC FEET WHICH IS GREATER THAN
THE REQUIRED AMOUNT OF 4347 CUBIC FEET
REQUIRED VOLUME (TEMPORARY POOL)
(I3,764/14924)=0.92' DEPTH
= 13,764 CUBIC FEET
TEMP
LENGTH
WIDTH
SQUARE
FEET
SUB -CUBIC
FEET
TOTAL
CUBIC FEET
2
182
82
14,924
15,121
15,121
2.92'
193
93
17,949
NOTE; THE ABOVE DATA ARE ABSOLUTE VALUES TAKEN FROM 3-D
COMPUTER DRAWINGS

I I
SEAL
PERM POOL CALCULATIONS -1 13301
SURFACE AREA @ 2.0' PROVIDED AT PP = 14,924 SQUARE FEET'•Wldi'H�S��`�•''
GREATER THAN REQUIRED 9,518 SQUARE FEET t,,e61141110`'
ACTUAL VOLUME CALCULATED @ 2.0' ELEVATION = 21,732 CUBIC FEET
(AREA AND VOLUME TAKEN FROM COMPUTER MODELING)
TEMP POOL CALCULATIONS
NEED AT LEAST (USING COMPUTER MODELING DATA) 13,764 CUBIC FEET OF
STORAGE 13,764=14,924 = 0.92') THEREFORE USE 0.92'
SET ELEVATION OF TEMPORARY POOL @ = 2.0'+0.92'=2.92'
SURFACE AREA OBTAINED FROM COMPUTER MODELING = 17,949 SQUARE
FEET @ ELEVATION OF 2.92'.
TOTAL VOLUME PROVIDED ABOVE PERM POOL = 15,121 CUBIC FEET WHICH
IS GREATER THAN THE REQUIRED AMOUNT OF 13,764 CUBIC FEET
ORIFICE SIZING
Qz nav = 13,764 � 172800 = 0.079653 CFS (Flow rate required for a 2 day draw down)
Q5DAY = 13,764'= 432000 = 0.031861 CFS (Flow rate required for a 5 day draw down)
TRY A 1 ", 1.5" AND 2" CIRCULAR ORIFICE
AREA OF 1" CIRCULAR ORIFICE = 0.005454 FT2
AREA OF 1.5" CIRCULAR ORIFICE = 0.012272 FT
AREA OF 2" CIRCULAR ORIFICE = 0.021817 FT2
HEAD ='/2 THE DEPTH OF TEMP. POOL OF (0.92') OR 0.46 FEET
COEFFICIENT USED FOR ORIFICE ENTRANCE = 0.63
EQUATION USED
Q
= C* A(2GH)"
Q= 0.63*0.005454*(2*32.2*0.46)'=
0.018702 CFS
EQUATION USED
Q
= C* A(2GH)'
Q= 0.63*0A12272*(2*32.2*0.46)'=
0.042080 CFS
EQUATION USED
Q
= C* A(2GH)''
Q= 0.63*0.021817*(2*32.2*0.46)'
= 0.074808 CFS
BASED UPON ABOVE VALUES, RECOMMEND THAT 1.5" ORIFICE BE USED
Q=0.04208 CFS ..........(0.031861 s 0.04208s 0.079653) THEREFORE OK
THEREFORE USE 1.5" ORIFICE

I. - A
Permit No. S /89Y7CU SS
No be Provided bY DWQ)
u
State of North Carolina
Department of Environment and Natural Resources
Division of Water Quality
STORMWATER MANAGEMENT PERMIT APPLICATION FORM
WET DETENTION BASIN SUPPLEMENT
This form may be photocopied for use as an original
DWQ Stormwater Management Plan Review:
A complete, stormwater management plan submittal includes an application form, a wet detention basin
supplement for each basin, design calculations, and plans and specifications showing all basin and outlet
swcture details.
1. PROJECT INFORMATION
Project Name: —Boulia Enterprises
Contact Person: Joseph h P unnehoo Phone Number: ( 252 ) 354-7761
For projects with multiple basins, specify which basin this worksheet applies to: _Vew_pQrt assin
elevations
Basin Bonom Elevation (-4) ft. (floor of the basin) —
Permanent Pool Elevation 2 ft. (elevation of the orifice)
Temporary Pool Elevation —?-q2..._, ft. (elevation of the discharge structure overflow)
areas
Permanent Pool Surface Area 14,924 sq, ft. (water surface area at the orifice elevation)
Drainage Area 6.4263 ac. (on -site and off -site drainage to the basin)
Impervious Area 3.4819 ac. (on -site and off -site drainage to the basin)
volumes
Permanent Pool Volume
Temporary Pool Volume
Forebav Volume
Other parameters
S.-VD A 1
Diameter of Orifice
Design Rainfall
Desiun TSS Removal'
Form SWU-102 Rev 3.99
21,732 cu. ft. (combined volume of main basin and forebay)
16,437 cu. ft. (volume detained above the permanent pool)
4., 3bO cu. ft. (approximately 20% of total volume)
_.3.4 (surface area to drainage area ratio from DWQ table).
1.5 in. (2 to 5 day temporan, pool draw -down required)
1 in.
90_ % (minimum 85% required)
Page 1 of 4

Footnotes:
' when using the Division SAIDA tables, the correct SAIDA ratio for permanent pool sizing should be computed based upon the
actual impervious `k and permanent pool depth. Linear interpolation should be employed to determine the correct value for non-
standard table entries.
2 In the 20 coastal counties, the requirement for a vegetative filter may be waived if the wet detention basin is designed to provide
90% TSS removal. The NCDENR BNiP manual provides design tables for both 85`k TSS removal and 90% TSS removal.
II. REQUIRED ITEMS CHECKLIST
The following checklist outlines design requirements per the Stormwater Best Management Practices Manual
(N.C. Department of Environment, Health and Natural Resources, February 1999) and Administrative Code
Section: 15 A NCAC 2H .1008.
Initial in the space provided to indicate the following design requirements have been met and supporting
documentation is attached. If the applicant has designated an agent in the Stormwater Management Permit
Application Form, the agent may initial below. If a requirement has not been met, attach justification.
Avalicants Initials
a. The permanent pool depth is between 3 and 6 feet (required minimum of 3 feet).
b. The-forebay volume is approximately equal to 20% of the basin volume.
c. The temporary pool controls runoff from the design storm event.
d. The temporary pool draws down in 2 to 5 days.
e. If required, a 30-foot vegetative filter is provided at the outlet (include non -erosive flow -
calculations)
f. The basin length to width ratio is greater than 3:1:...
9.
h.
k.
The basin side slopes above the permanent pool are no steeper than 3:1.
A submerged and vegetated perimeter shelf with a slope of 6:1 or less (show detail).
Vegetative cover above the permanent pool elevation is specified.
A trash rack or similar device is provided for both the overflow and orifice.
A recorded drainage easement is provided for each basin including access to nearest right-
of-way.
I. If the basin is used for sediment and erosion control during construction, clean out of the
basin is specified prior to use as a wet detention basin.
m. A mechanism is specified which will drain the basin for maintenance or an emergence.
Ill. WET DETENTION BASIN OPERATION AND MAINTENANCE AGREEMENT
The wet detention basin system is defined as the wet detention basin, pretreatment including forebays and the
vegetated filter if one is provided.
107
This system (check one) 0 does +0"does not incorporate a vegetated filter at the outlet.
This system (check one) 0 does woes not incorporate pretreatment other than a forebay.
Form SWU-102 Rev 3.99 Paoe 2 of 4 _

5
Maintenance activities shall be performed as follows:
After every significant runoff producing rainfall event and at least monthly:
a. Inspect the wet detention basin system for sediment accumulation, erosion, trash accumulation,
vegetated cover, and general condition.
b. Check and clear the orifice of any obstructions such that drawdown of the temporary pool occurs
within 2 to 5 days as designed.
Repair eroded areas immediately, re -seed as necessary to maintain good vegetative cover, mow vegetative
cover to maintain a maximum height of six inches, and remove trash as needed.
Inspect and repair the collection system (i.e. catch basins, piping, swales, riprap, etc.) quarterly to
maintain proper functioning.
4. Remove accumulated sediment from the wet detention basin system semi-annually or when depth is
reduced to 75% of the original design depth (see diagram below). Removed sediment shall be disposed
of in an appropriate manner and shall be handled in a manner that will not adversely impact water quality
(i.e. stockpiling near a wet detention basin or stream, etc.).
The measuring device used to determine the sediment elevation shall be such that it will give an accurate
depth reading and not readily penetrate into accumulated sediments.
4.S A- ,-X -
When the permanent pool depth reads feet in the main pond, the sediment shall be removed.
�—
When the permanent pool depth —04-2-5 feet in the forebay, the sediment shall be removed.
BASIN DIAGRAM
(fill in the blanks)
17 2 .00 Permanent Pool Elevation + 2 _ 00
Sediment Re oval El. -0. 2 75 0
------------ Sediment Removal Elevation —2' �0 75%
------
Bottom a ation
----------------------------- ---. ---------125%
------
Bottom Elevation — /
FOREBAY MAIN POND
Remove cattails and other indigenous wetland plants when they cover 50% of the basin surface. These
plants shall be encouraged to grow along the vegetated shelf and forebay berm.
6. if the basin must be drained for an emergency or to perform maintenance, the flushing of sediment
through the emergency drain shall be minimized to the maximum extent practical.
Form 5WU-102 Rev 3.99 Page 3 of 4

7. All components of the wet detention basin system shall be maintained in good working order.
I acknowledge and agree by my signature below that I am responsible for the performance of the seven
maintenance procedures listed above. I agree to notify DWQ of any problems with the system or prior to any
changes to the system or responsible party.
Print name: Bill Boulia
Title: President
Address: P.O. Box 1765 , Newport , N.C. 28570
Phone: [phone]
Signature:
Date: July 16, 1999
Note: The legally responsible party should not be a homeowners association unless more than 50% of the lots have been so!d and
a resident of the subdivision has been named the president.
I _ Gretchen E. Davis
a Notary Public for the State of North Carolina
County of Onslow , do hereby certify that Bill Boulia
personally appeared before me this 16 tb day of JulY ,1999 , and acknowledge the due
execution of the forgoing wet detention basin maintenance requirements. Witness my hand and official seal,
a
ell
lldl1611It1�t
My commission expires
SEAL
July 27, 1999
Form SWU-102 Rev 3.99 Page 4 of 4

'=`I��.V 1- ls'. r '.r, .Tr it -,. r' i h �, ,.•'9 - ,.
NTATlb,!W �1NS'P,ECTIO.I�I,'REPO'RT,
NORTH CAROLINA DEPARTMENT OF ENVIRONMENT AND NATURAL RESOURCES
LAND QUA LITY SECTION: 127 Cardinal Dr: Ext. Wilmington, NC 28405-3845 [phone]
County:. lA•%L-)T-A Prolec }L L '121.16
_1 ( -A- 141711Z///Rive Basin !%
Person Financial] Responsible:_( _!
Address:-
1. Project Location:
Pictures: Yes No © Prints 0 Slides ❑ Video ❑
2. Weather and Soil-
3. Is site currently under notice of violation? Yes No
❑
4. Is the site in compliance with the S.P.C.A. and the rules? Yes
❑ No If No, check violations below:
5. Violations:
❑ a. No approved plan, G.S. 113A-57(4) and 15A NCAC 4B4O007(c)
❑ g. Inadequate buffer zone, G.S. I I3A-57(l )
D;b. Failure to follow approved plan, G.S. 1 13A-61. I
Xh. Graded slopes and fills too steep, G.S. 1 13A-57(2)
or 15A NCAC 4B.0024 (d)
❑ c. Failure to submit revised plan, G.S. 1 13A-54.1(b) and
�i. Unprotected exposed slopes, G.S. 1 I3A-57(2)
! l5A NCAC 4B.001$(a)
d. Failure to provide adequate groundcover, G.S. 113A-57(3) and
',[q j. Failure to maintain erosion control measures,
15A NCAC 413.0007(b) or 15A NCAC 4B.0024(e)
ISA NCAC 43.0013
�s e. Insufficient measures to retain sediment on site, G.S. 113A-57(3)
❑ k. Other (describe)
�ellf. Failure to take all reasonable measures, 15A NCAC 4B.0005
6. Has sedimentation damage occurred since the last inspection?
Yes xIf yes, where? (check all that apply): No ❑
Lake/natural watercourse on the tract ❑ Lake/natural watercourse off the tract ❑ Other property ❑
Description:
Degree of damage: Slight ❑ Moderate ❑ Severe ❑
7. Contact made with (Name)
Title
Inspection report given ❑ or sent to the Person Financially Responsible Date givenisent
8. Corrective actions needed:
4r-- Yy1 :r Zr `ZC
1 rl1 -/� �t�-4%r !r/� �JG i—� ✓- i I, s�•,- r-_f '%r"iY..•v,� r�"" .9iii>vl��•_,�
%f� / i f�%r�-� ��'%'! �- .� r i .�I c: � ,9 /r_� •�'1--�"_i /`'1 in Ic_/.r^. i -� �- « �_/_ rGyvf
^f FJ �l/I� i���� r�"!..�. ! rl r••//�./_ ! �i ,�{�/! /.; �-r r�7 .If.�%%—% �V
/i/_r'=.� �/1 -?_ %•: r7 G!//h /ram' l'7.`' .� % /� 13.+�:! /� ? 7'G7��^i� '1 r�i� r �•1 1 ��..
-/ _ rt � / 'e�t"Cf� rr}'3^ 11�;1 �l�f- I.•_—. — --
lr�
9. Comments: /ham ��t r_Gl�,-z•74 .,�: ' // '� !..-��� �_ii. / _a�.. , y, .�- -
/ter _i ��r r�-��r_r-r��� �:z,-;�.,f r/G��-%ri /,1_,-, '�;.�_,�(1�• - -� �t�
/_.'7 fi .•I }-r n / " /U e 7iX' ! 7lG�� / Y l'ir'a--.,�i/ �_n �.f' i •) r rr .%7
_ yr Id, •�� �
•.i�%r�'1�i7-: �_ :�_ _ +. _�"".-) 1 /� �� .✓'li'r / r1•.� ��_�n7•'' %� /lr�%�11. �',: i' -- _ .,�yr'
�e1�-'i i%'7r /'7ir n �/L'�i �r/ ,C��-?: rile �•f .%7 r� �.'7�rS i-- -�' f� /�.w .i�� / /.. f!i
71 n yi.� ����•�/ter �i�✓ �i�/� f' :? �J1 ii/�.C�j .f r!f/ /J-+'trl'`
�r/f f.,rY :+r i`i''I /' �i ,f +v•f/. l !/t �� _`�/ �/� Ori/I �''(_,i f// F.�-7 li'F/ `r%i
' •f. rr'� �fZ _. C.c+�,L � '% /�f o ;°• f i!7/f ram! .7�. '7i.1� i i i ,i ,/ /1-QJ.�� �''± 6 r 1 r LT
Re ort b 4/17,7 /'7Z I` Others present:
Date oZnspect-ion: 1111/ 9 ) Time arriving at site:.//; f�r/ _ _ Time leaving site:
cc: ,

LAND QUALITY SECTION
PROJECT: _a A - �z Page of
INSPECTED BY:
DATE:

POND MAINTENANCE REQUMEMENTS
Project Name: �i,� �oa.��A tN%ER �iCl3ES
Perauttee: �� �' �' '',60��,►,g
Address: fOoROX 1 9 S' . AIE-W °dg.T A'c
E C E l V E
0
JUL
16 1998
aEM
pnoi #
S 7c) PhoneNo. �—';'2 A3
I. Monthly, or after every runoff producing rainfall event, whichever comes first:
A. Inspect the trash rack; remove accumulated debris, repair/replace if it is not functioning.
B. Inspect and clear the orifice of any obstructions. If a pump is used as the drawdown
mechanism, pump operation will be checked. A log of test runs of the pump will' be kept
on site and made available to DWQ personnel upon request.
C. Inspect the pond side slopes and grassed inlet swales; remove trash, and repair eroded areas
before the next rainfall event.
D. If the pond is operated with a vegetated filter, the filter will be checked for sediment
accumulation, trash accumulation, erosion and proper operation of the flow spreader
mechanism. Repairs/cleaning will be done as necessary.
II. Quarterly (Four times a year):
1
A. Inspect the collection system (ie. catch basins, piping, grassed swales) for proper
functioning. Accumulated trash will be cleared from basin grates, basin bottoms, and piping
will be checked for obstructions and cleared as required.
B. Pond inlet pipes will be checked for undercutting. Ripcap or other energy dissipation
structures will be replaced, and broken pipes will be repaired.
III. Semi-annually (twice a year):
A. Accumulated sediment from the bottom of the outlet structure will be removed.
B. The forebay depth will be checked at various points. Sediment removal is required when the
depth is reduced to 75 % of the original forebay design depth of � !!
C. Grassed swales, including the vegetated filter if applicable, will be reseeded twice a year as
necessary.

ti " b •'
'_ a 1' - .+
_ e
' i .� �
- i 1•
-�. � •J � �
• i 1 ��'1
1. �•
� � .�
� ,11. �

POND MAINTENANCE REQUIREMENTS
PAGE 2
IV. Annually (Once a year):
A. The pond depth will be checked at various points. Sediment removal is required when the
depth is reduced to 75 % of the original design depth or Y , whichever is greater. Design
depth is �z_', measured vertically from the orifice down to the pond's bottom.
Sediment must be removed to at least the original design depth.
V. General:
A. Mowing of the side slopes will be accomplished according to the season. Maximum grass
height will be d".
B. Cattails are encouraged along the pond perimeter, however they will be removed when they
cover more than 1/2 the surface area of the pond. The best time to cut them is at the end of
the growing season, in November. Environmentally sensitive chemicals for use in killing
cattails can also be used. Contact your nearest Agricultural Extension Agent.
C. The 'orifice/pump is designed to draw down the pond in 2-5 days. If drawdown is not
accomplished in that time, the orifice will be replaced with a larger or smaller orifice. Slow
drawdown may be attributed to a clogged system. The source of the clogging will be found
and eliminated.
D. All components of the detention pond system will be kept in good working order. Repair
or replacement components will meet the original design- specifications as per the approved
storrawater plan. If previously approved compbrients are determined to be ineffective, the
component must be redesigned and/or replaced.
VI. Special Requirements:
hereby acknowledge that I ani the financially
(plerue print or type mane clearly) .
responsible parry for maintenance of this detention pond. I will be responsible for the performance of the
maintenance as outlined above, as part of the Storinwater Management Permit received for this project.
Signature: Date:
Revi$gd 2Y_'3/97

_ �
y
,�•, ,�.
,�
•. .,�.
1 � t
� �