SW8911207_Historical File_19911218

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State of North Carolina
Department of Environment, Health, and Natural Resources
Wilmington Regional Office
James G. Martin, Governor Bob Jamieson
William W. Cobey,Jr., Secretary Regional Manager
December 18, 1991
DIVISION OF ENVIRONMENTAL MANAGEMENT
Mr. Sidney Edward Jones
49 Raeford Street
Ocean Isle Beach, North Carolina 28459
Subject: Certification of Compliance
with Stormwater Regulations
Stormwater Project No. 911207
Jones Ford @ Shallotte
Brunswick County
Dear Mr. Jones:
This Certification is pursuant to the revised Stormwater
Application for Jones Ford @ Shallotte received on December 6,
1991. Based on our review of the project plans and
specifications, we have determined that the stormwater control
system complies with the Stormwater Regulations set forth in
Title 15A NCAC 2H. 1003(i) . The runoff will be treated in a
detention pond which is sized to achieve 90% reduction in Total
Suspended Solids.
This Certification shall be effective from the date of
issuance until rescinded and supersedes the Certification of
Compliance #910902 issued to you on November 21, 1991 . The
project shall be constructed and maintained in accordance with
the final plans and specifications approved by the Wilmington
Regional Office.
A professional engineer must certify that the stormwater
system has been installed in accordance with the approved plans
and specifications . The attached certification should be
received by this Office within 30 days of completion of
construction.
-Continued-
127 Cardinal Drive Extension,Wilmington, N.C.28405-3845 •Telephone [phone]•Fax [phone]
An Equal Opportunity Affirmative Action Employer

Mr. Jones
December 18, 1991
Page Two
If you have any questions concerning this matter, please
call Alexis Finn or me at (919) 395-3900.
Sincerely,
ave Adkins
Water Quality Regional Supervisor
Attachment
DA/aif: 911207 .DEC
cc: Don Covil, P.E. , Houston & Associates
Robert Tucker
John Parker, DCM
Alexis Finn
Wilmington Regional Office
Central Files

DIVISION OF ENVIRONMENTAL MANAGEMENT
Evaluation of Stormwater Treatment and Disposal System
Draining to Waters Other Than Class SA
PROJECT DATA
Project Name: Jones Ford @ Shallotte
Project No. : 910902
Location (County, Township/Municipality, Address) :
Shallotte, North Carolina
Brunswick County
Applicant Name: Mr. Sidney Edward Jones
Mailing Address : 49 Raeford Street
Ocean Isle Beach, North Carolina 28459
Submittal Date: December 6, 1991
Water Body Receiving Stormwater Runoff: Williams Branch
Classification of Water Body: "C Swamp"
DETENTION POND EVALUATION
1 . Yes No The design storage is for the runoff from all
impervious surfaces resulting from 1-inch of
rainfall and is located above the permanent
pool.
2. Yes No The permanent pool is designed for 90% TSS
removal. Therefore, no vegetative filter is
required.
3. Yes No The runoff completely draws down to the
permanent pool in 5 days, but not less than 2
days.
4. Yes No The mean depth of the permanent pool is a
minimum of 3 feet.
5. Yes No The inlet structure is designed to minimize
turbulence and short circuiting.
6. Yes No An appropriate operation and maintenance plan
has been provided for the system.
-Continued-

WET DETENTION POND EVALUATION CONTINUED
7e Yes No THIS PROJECT MEETS THE STORMWATER CONTROL
REQUIREMENTS OF 15A NCAC 2H. 1003 (g) , (i) , (k) ,
and ( 1) (For Yes, 1 through 7 must all be
circled Yes. )
Brief Explanation: The surface area of this detention pond has
been designed to remove 90% TSS without the aide of a vegetative
filter.
DIVISION OF ENVIRONMENTAL MANAGEMENT SIGN-OFF
Wilmington Regional Office
r-Np
Date Individual Evaluating Form/Plans
)8 b u.r„ , egg i gal2
Date Water Quality Regional Supervisor
cc: Applicant/WiRO/Mills/CF

Engineer's Certification
I, , as a duly registered
Professional Engineer in the State of North Carolina, having been
authorized to observe (periodically/weekly/full time) the
construction of the project,
(Project)
for the hereby state that, to
(Project Owner)
the best of my abilities, due care and diligence was used in the
observation of the project construction such that the
construction was observed to be built within substantial
compliance and intent of the approved plans and specifications.
Signature
Registration Number
Date

HOUSTON and ASSOCIATES, PA
Consulting Engineers
SHALLOTTE, NORTH CAROLINA 28459
Telephone[phone] 4918 Main Street
Facsimile(919)754-2121 Post Office Box 2927
Monday, November 23, 1992
RECEIVED.
Ms. Linda Lewis
Division of Environmental Management NOV 24 1992
North Carolina Department of Environmeet WATT
Health, and Natural
atu al Resources TO
V Wilmington Regional OificQ
127 Cardinal Drive Extension E DEM
Wilmington, North Carolina 28405 U i U.
Subject: Jones Ford, Shallotte NOV 3 0 1992
Stormwater Certification ve
M )
Dear Ms. Lewis: -,0 j # 9112G7 f
It is our opinion that the stormwater facilities for the Jones Ford
project are now in reasonable compliance with the intent of the approved
plans and specifications. It is noted that modifications to the emergency
spillway were allowed during the construction phase of the project where
such modifications would not prevent the system from performing its
intended function. The modifications are summarized below:
1. A concrete, 2' wide, parabolic-shaped "flume" was allowed in the
center of the emergency spillway. The elevation of the "crest" of
the flume is approximately 0.4' above the elevation of the top of the
riser (principal spillway).
2. The portions of the emergency spillway to each side of the
parabolic flume are stabilized with rock and are sloped (in
cross-section view) rather than paved and fiat as designed. The
effective width of the spillway is greater than the 6' shown on the
plans.
With the above modifications, the combined capacities of the principal
and emergency spillways still exceed the value of the 100-year flood peak
discharge. Also, the 10-year flood elevation is at approximately the same
elevation as the top of the concrete "flume" of the emergency spillway, i.e.,
the rock portion of the emergency spillway will not activate frequently.
The Owner has attempted to stabilize exposed surfaces; however, in
many locations, he has not had success even after several attempts.
Therefore, stabilization of some exposed surfaces with vegetative cover still
needs to be performed. This includes all berm slopes, inlet swales, and area
between the pond and showroom. In addition, frequent inspections need to
take place to insure that stormwater will flow unobstructed through the

Ms. Linda Lewis Page 2 Jones Ford
November 23, 1992 Stormwater Certification
orifice, over the principal spillway, and over the emergency spillway. It is
critical, also, that after each rainfall event in which the emergency spillway
is "engaged", a thorough inspection takes place to detect any signs of
spillway instability. If such signs are apparent, the contractor should be
called to rectify the problem, or potential problem.
We request that DEM accept this letter as fulfilling the obligation of
the Owner to provide Engineer's Certification.
Your attention to this matter is appreciated.
Sincerely,
Donald M. Covil, P.E.
Houston and Associates, P.A.
cc: Mr. Dave Adkins, P.E, DEM, Wilmington
Mr. Ed Jones
File; 91-0424 (Jones Ford)
AECEIVLILI
NOV 3 0 1992
U
-ol # 91�12 7

14.4..( —
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glnoa- rerao7
Project #: -9,492' File Name: Reviewer:Alexis Finn
Project Name: JONES FORD W SHALLOTTE Date: I!/il/91
ttttvt$$$$$$ttttt*DETENTION POND ANALYSIStttttttttttttttttttttttt
Iota; Site Area, TA: TA: 255983 ft"2 If
[TA (acre)] / [43560 ft"2/acre] TA= 5.876561 Acres
otai Drainage Area, DA: DA: 190949 ft"2 ##
[DA (acre)] / [43560 ft"2/acre]: DA: 4.383585 Acres
IMPERVIOUS SURFACE AREA CALCULATIONS:
Structure Surface Area, A Runoff Coef., C
st
Buildings: 11858 1 Adjusted Surface Area : A $ C : 11658 ft"2 If
Perking/sidewalks/streets: 109961 0,95 Adjusted Surface Area : A * C = 104462.9 ft"2 ##
Gre n Areas: 69130 0.2 Adjusted Surface Area : A $ C : 13826 ft"2 If
TOTAL: 130146.9 ft"2 ft
''ercent Impervious, %I: note: SA:(6UILDING + PARKING..): 121819 sf
[SA/TA]t100:
[ 121819 / 255983 ]t100= %I: 41.59%t
Nate: If %I < 30% check Density Option.
It %I > 30%, require engineered system to minimize non-point stream degradation.
POND SI2IW
Niximum Required Storage Volume, VOLreq: note: SA has been multiplied by runoff coefficients
( A (ft 2) v (1 inch of runoff) v (1 ft/12 inch)]:
[ 130146.9 ft"2 t 1 inch * 0.083333 ft/inch]: VOLreq: 10845.51 ft"3
ft
PAD MEIN :
Bottom Elevation, ELb: ELb : 11.2 ft f#
Permanent Pool Elevation, ELpp: Elpp: 14.1 ft If
Area of Permanent Pool, App: App : 11288 ft"2 ft
forage Pond Elevation, Esp: ELsp: 15,3 ft ft
Area of Storage Pond, Asp: Asp = 11625 ft"2 It
Runott Storage Depth, d:
(via project engineer's design: d : ELsp - ELpp) d: 0.6 ft ft
Storage Volume Provided, VOlpro: Side Slope: 3:1 ####
Volume 1, VI: App t d = 11288 ft"2 t 0.6 ft : V1: 10372.8 ft"3
Volume 2, V2: (Asp - App) t d $ 0.5 : V2: 101.1 ft"3
VOLpro : Vi + V2 : 10372.8 ft"3 + 101.1 ft"3 VOLpro= 10473.9 ft"3
Note: VCLreq < VOLpro; however, less than 5% difference, therefore acceptable.
S Excess Storage :(VOLreq / VOLpro) t 100 % Excess Storage 3.55%<

DETENTION POND ANALYSIS CONTINUED: PAGE TWO
iEhNENANi POOL:
Perm. Pool at Normal Level. 14.7 ft
Sotto-.; of Pond = 11,2 ft
Depth Provided, D = 3,5 ft C Okay, depth > OR" = 3 ft,
SA/LA CALCULATION:
By Chart 114; @ 90% TSS:
Depth, D 3.5 ft
Impervious = 47.59%
DA - 4.383585 Acres Where DA is the Draninage Area
SA/DA % = 4.8 1##lk
Area of Permanent Pool Required = (SA/DA %) v DA
Area of Permanent Pool Required : 4.8 g 2.981162 Acres
Area of Permanent Pool Required = 0.210412 Acres
Area of Permanent Pool Required = 9165.552 ft"2
Area of PERMANENT POOL Required= 9165.552 sf < provided area of 11288 sf <--OKAY: sufficient stor
ORIFICE / OUTLET SIZING:
VOLpro = 10473.9
0. 1tice outflow, 2 Day Drawdown = Volpro/[(2 day) * (86400 sec/day)]
Orifice outflow, 2 Day Drawdown : 10473.9 ft"3 / 112800 sec = 612= 0.060612 cfs
Orifice C.S. Area, A:
A. Q/[Cd((2gh)"0.5))]
A. 0.060612 / [0.6*((2$32.2*0,6)"0.5))]= A2= 0.016251 ft"2
A2= 2.340223 inch"2
Pipe diameter, d: d2: 1.126170 inch
Note: Head, h = maximum pond level - permanent pond level = 0.6 ft
Coeficient of Discharge, Cd = 0.6
Or„ice outtow, 5 Day Drawdown : Volpro/[(5 day) $ (86400 sec/day)]
Urifice outflow, 5 Day Drawdown : 10473.9 ft"3 / 432000 sec = Q5: 0.024245 cfs
Orifice C.S. Area, A:
A= Q/[Cd((2gh)"0.5))]
A. 0.024245 / [0.6v((2*32.2*0.6)"0.5))]: A5. 0.006500 ft"2
A5. 0.936089 inch'2
Pipe diameter, d: d5: 1.091726 inch
CHECK: d5 < dprovided < d2 : 1.1 < 1.15 < 1.13 < OKAY.,.; Orifice is sized correctly.

HOUSTON and ASSOCIATES, PA
Consulting Engineers
SHALLOTIE, NORTH CAROLINA 28459
Telephone[phone] 4918 Main Street
Facsimile(919)754-2121 Post Office Box 2927
Thursday, December 5, 1991
Ms. Alexis I. Finn, Environmental Engineer
Division of Environmental Management
North Carolina Department of Environment,
Health, and Natural Resources
127 Cardinal Drive Extension
Wilmington, North Carolina 28405
Subject: Jones Ford, Shallotte
Request for Modification of Stormwater Certification
Dear Ms. Finn:
Enclosed for your review and approval are two copies of revised plans
and calculations for the subject project. On behalf of the owner, we request a
modification to the certification for Stormwater Project 910902 issued
November 21, 1991.
The revisions to this project reflect, to a degree, as-built conditions as
of December 2, 1991. Since the as-built conditions entailed a pond surface
area, orifice elevation, and outlet structure elevations different from our
original design, we had to revise the orifice size, orifice elevation, top of riser
elevation, emergency spillway elevation, etc., accordingly. These changes are
documented in the calculations accompanying this letter.
By copy of this letter, we are also sending Mr. Jim Gregson two copies of
the plans for wetlands review.
Based on our ongoing conversations, transmittals, and meetings with
DEM, we believe that approval of the modification request is warranted.
The attention and consideration DEM has demonstrated on this project
is appreciated. We look forward to hearing from you at your earliest
convenience.
Sincerely,
Donald M. Covil, P.E.
Houston and Associates, P.A.
Enclosures
cc: Mr. Dave Adkins, P.E, DEM, Wilmington p LE ( I I U16
Mr. Jim Gregson, DEM, Wilmington III)
Mr. Ed Jones DEC 6 1991 V
File; 91-0424 (Jones Ford)
DEM
=o #_9t/2-0?-

Houston and Associates P.A. JOB 'TD...rt ""nY,...r '
SUBJECT `,E,..:....( i..)c* rk.-1" ,.. -.Fs ...,,<
CONSULTING ENGINEERS SHEET NO. / OF
4918 Main Street Post Office Box 2927 CALCULATED BY S '1- DATF ►2-/1t-Il9 !
Shallotte, North Carolina 28459 [phone] CHECKED BY DATE
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RISER DIAMETER. . . . 2.5 FT. ; 1 ;
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. RISER ELEVATION. .. 15.8 FT. , r
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TAILWATER ELEVATION. . . 0 Fl . DEC 6 1991 , , ;
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COMPUTED WATER SURFACE ELEVATION BASED ON: D £ M 1 ; 1
INLET CONTROL 1 +t .9iv275 P'i /IZO
_ --�--r--r--r--
OUTLET CONTROL 14.64217 FT. ' '
WEIR FLOW 16.54766 FT. -1 1
-- HIGHEST ELEVATION COMPUTED IS THE ACCEPTED ELEVATION.

Houston and Associates, P.A. J0B TS,h e•f r.4
SUBJECT
CONSULTING ENGINEERS SHEET NO. Z OF
4918 Main Street Post Office Box 2927 CALCULATED BY *_ DATF 1ziti,i9/
Shallotte, North Carolina 28459 [phone] CHECKED BY DATE
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OUTLET CONTROL 14.Y.4217 FT. 1 1 1
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Houston and Associates, P.A. JOB D794^ef
f°"(
SUBJECT
CONSULTING ENGINEERS SHEET NO. -? OF
4918 Main Street Post.Office Box 2927 CALCULATED BY mac- DATF /?/Li:/ter/
Shallotte, North Carolina 28459 [phone] CHECKED BY DATE
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JUNES FORLI RISER CAPACITY WITH RISER E 15.3 1< WATER SURFACE s' 17.0 Ftfx. F_ ._--
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DESIGN FLOWRATE = 29 CFS '
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RISER DIAMETER. . . . 2.5 FT_
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1 RISER ELEVATION.. . 15.8 FT. ir--r-
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___L____J__J CULVERT LENGTH. .. . 20 FT. -__L
INVERT-IN 12.1 FT.
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TAILWATER ELEVATION. . . 0 FT.
COMPUTED WATER SURFACE ELEVATION BASED ON:
,
J J INLET CONTROL 16.77916 FT. --!---
OUTLET CONTROL 16.03912 FT.
WEIR FLOW 16.74837 FT.
--
__I___
HIGHEST ELEVATION COMPUTED IS THE ACCEPTED ELEVATION.
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+ONES FORD REVISED SW BASIN
DON COVIL 12/4/91
VOLUME OF RUNOFF FROM 1 INCH RAINFALL : 10500 CF
ELEVATION OF NORMAL POOL (BOTTOM OF ORIFICE) : 14 .7 FT . MSL
SURFACE AREA OF POND AT NORMAL. POOL : 19800 SO . FT
ELEVATION OF FOOL AT DESIGN STORAGE : 15 .23 FT . MSL
DIAMETER OF ORIFICE: 1 .75 IN .
TIME INCREMENT FOR ROUTING : 2 HR .
TIME ELEV . HEAD FLOWRATE VOLUME END ELEV
-y - - c 99.^98 a= 35• 421 .3546 5 8. 2
t. ].:_, .c= ._,2 • }� .a _I .�_,�'147E-02 1.i .cty��7c
c 8-
c_' 15 .20872 .5087195 5.733458E-02 �I•i� .�,t�`� 1_� .1;�7V1
4 i s 87� 8787-2 5 t 5
s•_� . 1t, -v7 .4u.�� rc�c 5 .614739E-02 404 .2612 1_� . 167�'.�
15 . 16745 .467453 5 .495997E-02 395 .7117 15 . 14747
8 15. 14747 .4474669 5 .377222E-02 387 . 16 15 . 12791
10 15 . 12791 .4279127 5.258417E-02 378 .606 15. 10879
12 15 . 10879 .4087916 .051_:959 ; 70 .0504 15 .0901
14 15 .0901 .3901014 5 .1 20728E-02 361 .492 15 .07184
16 15 .07184 .3718443 4 .9c:0 1828E-02 352 .9316 15 .05402
18 15 .05402 .3540192 4 .782895E-02 344 .3684 15 .03663
20 15 .03F.63 .336627 4 .F.F.,3929E-02 335.88029 15 .01967
22 15 .01967 .3196669 4 .544921E-02 327.2343 15.00314
24 15 .00314 .3031397 4 .425873E-02 318.6628 14.98705
26 14 .98705 .28870455 4 .306782E-02 310.0883 14 .97138
28 14 .97138 .2713843 4 . 187644E-02 301 .5104 14 .95616
30 14 .95616 .256156 4 .068 457E-02 292 .9289 14 .9413S
32 14 .94136 .2412616 3 .9'49222E-02 284 .344 • 14 .927
34 14 .927 .P270002 3 .3299-28E-02 275 .7543 1 r-1• .9130 ,
'ry~ 14 . 120? ..E21807 2c1 1i" 1 =1 a �; ;�.;•;1 C-.;
_. :..i -� v _•I.'.1. �. � t. -..(.I..... .....-. ._. a....I...:i.L,..� 1. . l"r li'.'
.v ..L

40 14 .88652 . 1 865215 C 7f 698 02249 .9623
::1 . 1.� 1 .�E-'_�_ 14 .8739
42 14 .8739 . 1738968 3c�2 1 49E.-' -2 241 .3547
J .iJ_I �f 14 .36171
44. 14 .86171 . 1617069 3 .232524E-02 232 .7418 14. .84.995
46 14 .84995 . 1499519 3 . 1 12 317E-0E 224 . 122S 14 .33363
48 14 .833E . 1386323 2 .993025P-OP 215 .4978 14 .82775
50 14 .82775 . 1277494 2 .873141E-02 206 .8F,62 14 .817=`
52 14 .8173 . 117301 .0275314 198 .2261 14 .80729
54 14 .80729}729 . 1072893 .0263303 139 .5781 14 .79771
9 7 2 5 -7r- } 130 .9211
�_i�•, 14 .79771 + . r � 1442E-C�r_ L ..�12 ' -�4E=-{_:� 14 .73858
56; 14 .78858 V 85� �- - 172 .2538 14 .77988
.,._I '�•,,,82E-_}c 2 .392414E-;,>r
60 14 .77988 .079c 769 2 .271894E-02 163 .5763 14 .77162
62 14 .77162 7 . 161522E-02 2 . 151 197E-02 154 .8862 14 .76279
64 14 .7A379 6 .879223E-02 2 .{ 30305E-02 14A . 182 14 .75641
66 14 .75641 5 .640883E-02 1 .9091 99E--{i2 137 .4623 14 .74947
68 14 .74947 4 .946614E-02 1 .787851E-02 123 .7253 14 .74297
70 14 .74297 4 .296494E-02 1 .666229E-{r2 119 .9635 14 .73691
72 14 .73691 3 .690624E-02 1 .544285E-02 111 . 1885 14 .73129
74 14 .73129 3. 129101E-02 .0142196 102.3311 14 .72612
76 14 .72612 2 .612019E-02 1 .299169E-02 93 .54016 14 .7214
78 14 .7214 2. 139568E-02 1 . 175319E-02 84 .65898 14 .71712
80 14 .71712 1 .711941E-02 1 .051772E-02 75 .72761 14 .7133
82 14 .7133 1 .329517E-02 9.26882E-03 66 .73551 14 .70993
84 14 .70993 9.924889E-03 8 .008299E-02 57 .659755 14 .70701
86 14 .70701 7 .0 12367E-03 6 .73 1468E-03 48 .46657 14 .70456
88 14 .70456 4 .564286E-03 5 .43030 1 E-03 39 . 10177 14 .702r9
90 14 .70259 2.589226E-03 4 .090368E-03 29 .45065 14 .7011
92 14 .701 1 1 . 1 0 1494E-03 2 .667894E-03 19 .20883 14 .70013
94 14 .70013 1 .306534E-04 9. 188356E-04 6 .615617 14 .6998