SW8121008_HISTORICAL FILE_20121107

STORMWATER DIVISION CODING SHEET
POST -CONSTRUCTION PERMITS
PERMIT NO.
SW9P"I2,�(�(&
DOC TYPE
❑ CURRENT PERMIT
❑ APPROVED PLANS
HISTORICAL FILE
❑ COMPLIANCE EVALUATION INSPECTION
DOC DATE
YYWMMDD

Central Files: AP5 SWP
11 /07112
Permit Number SW8121008
Permit Tracking Slip
Program Category
Status Project Type
State SW
Active ' New Project
Permit Type
Version Permit Classification
State Stormwater
1.00 Individual
Primary Reviewer
kelly.johnson
Coastal SW Rule
Coastal Stormwater - 2008
Permitted Flow
Facili
Facility Name
Harbour Watch Lot 4
Location Address
1324 Harbour Watch Ct
Carolina Shores NC 28467
Owner
Permit Contact Affiliation
MajorlMinor Region
Minor Wilmington
County
Brunswick
Facility Contact Affiliation
Owner Name
Owner Type
Individual
Gilbert D Lepsig
Owner Affiliation
Gilbert D. Lepsig
408 17th St
Sunset Beach NC
28468
Dates/Events
Scheduled
Oria Issue App Received Draft Initiated Issuance
Public Notice Issue Effective
Expiration
11/07/12 10/10/12
11/07/12 11/07/12
11 /07/20
Regulated Activities
Requested/Received Events
State Stormwater - HD - Infiltration
Deed restriction requested
Deed restriction received
Additional information requested
10/24/12
Additional information received
11/06/12
Outfall NULL
Waterbody Name Stream Index Number Current Class Subbasin

Johnson, Kelly
From: Johnson, Kelly
Sent: Monday, November 05, 2012 9:10 AM
To: 'Lee Galloway'
Subject: RE: Ocean Harbour Estates, Stormwater
Attachments: 2012 11 mtg_notes 931204.xlsx; 2012 11 permit 931204.docx; 2012 11 permit 121008.docx
Lee,
I talked to Vince this morning, and he said he thought he could get out there this week so maybe give him a call. I think
the two of you have been on opposite vacation schedules. Other than that, I went back through everything and I think it
will all work out pending Vince's site visit. I have attached the updated drafts of the two permits and the impervious
summary that will stay on file with SW8 931204, 1 changed the cell shown in green from your previous version because
the DA had to be at least as big as the impervious area on the DA. So, just let me know if you are OK with this change.
Kelly
From: Lee Galloway [mailto:[e-mail]]
Sent: Wednesday, October 31, 2012 1:33 PM
To: Johnson, Kelly
Subject: RE: Ocean Harbour Estates, Stormwater
Kelly,
I just realized what you were referring to in regards to our conversation below regarding Question #2a. The Option #2
that you see on the first page of the talcs (titled: Simple Method — Volume Required / Provided Calculations) is not
referring to the BMP 16.3.9 Waiver Option #2. That is simply showing the two different Simple Method Storage Volume
talcs for SA Waters. I will revise the stormwater narrative to clearly indicate which Waiver option we are choosing and
how to find the calculation that references it.
I've also attached the revised Meeting Notes spreadsheet with updated numbers that all match up. The revised
applications that I send in will match the numbers in the spreadsheet. See my notes to you in the spreadsheet that are in
red bold font.
I am trying to finish up your comments today and hopefully get everything back to you tomorrow. I will be out of the
office tomorrow and Friday.
Thanks!
Lee Galloway
Tripp Engineering, P.C.
(p) 910.763.5100
(f) 910.763.5631
[e-mail]
NOTICE: This electronic correspondence and all attachments may contain privileged information intended only for the use of the
addressee. Any information contained within this correspondence is provided for your convenience. No assertion of accuracy is
made by Tripp Engineering, P.C. unless physical documents are obtained, sealed AND signed. User assumes all responsibility for use
of this digital information.

From: Johnson, Kelly [maj tQ-,klly,p•[e-mail]
Sent: Wednesday, October 24, 2012 11:15 AM
To: Lee Galloway
Subject: RE: Ocean Harbour Estates, Stormwater
Lee,
Here are the answers to your questions:
#1: 1 am trying to get the current permit's HC-1 to match the sum of the onsite and offsite DA for Lot #4 (see attached
mtg notes)
#2a: The calculations talk about option #2 (the 1st page of the calcs)? in order to do #4 you would need to show the
calcs attached as "option 4".
2d: The supplement shows the post>pre? You can put the mitigated,post value for that, and that should clear that up.
This should be pretty simple. Let me know if I am missing something...
KJ
From: Lee Galloway [ - i en ec.rr.com]
Sent: Wednesday, October 24, 2012 9:52 AM
To: Johnson, Kelly
Subject: RE: Ocean Harbour Estates, Stormwater
KJ,
I have quick questions regarding comments #1, #2, & #4.
Comment #1: The way I read your comment, in the second column of the table for SW8 121008 you want me to add the
remaining drainage info that drains "Off -site" to HC-1 from Lot 4? In other words, the information that is on the plan in
the site data table under the SW8 931204 impervious info?
Comment #2: In the stormwater narrative, I noted in the last sentence of the first paragraph that the infiltration trench
was sized appropriately to store the 10-yr storm using the % infiltration rate to waive the off line bypass and vegetated
filter strip requirement. Also included in the submittal were stormwater routing calculations showing the peak outflow
for the 10-yr storm at %: infiltration rate (outflow = 0.00). Can you please look through the submittal and make sure
these items were included in your copy?
Comment #4: The stormwater routing calcs indicate that the post development is less than the pre for the 10-yr storm.
Do you need something else?
Call me if you want to discuss.
Thanks!
Lee Galloway
Tripp Engineering, P.C.
(p) 910.763.5100
(f) 910.763.5631
lee-trippeng0Dec.rr.com
NOTICE: This electronic correspondence and all attachments may contain privileged information intended only for the use of the
addressee. Any information contained within this correspondence is provided for your convenience. No assertion of accuracy is

made by Tripp Engineering, P.C. unless physical documents are obtained, sealed AND signed. User assumes all responsibility for use
of this digital information.
From: Johnson, Kelly [mailto:kelly.p,iohnson@ ncdenr.gov�
Sent: Wednesday, October 24, 2012 8:54 AM
To: Lee Galloway
Subject: Ocean Harbour Estates, Stormwater
Lee,
The attached add info will be mailed today. It is pretty simple. I think some info was just inadvertently omitted from the
package. I have also attached drafts of the permits in case you want to review them. Again, they are not that
complicated, but there is a lot of information cross-referenced.
Kelly
*** My email has changed to [e-mail]
K.e�.l.�oi�wsow
Kelly Johnson
Environmental Engineer
Division of Water Quality
5tormwater Permitting
127 Cardinal Drive Extension
Wilmington, NC 28405-3845
Office: 910.796.7331
Fax: [phone]
E-mail correspondence to and from this address may be subject to the North Carolina Public Records law and may be
disclosed to third parties.
3

Revised: 10/31/12 Harbourwatch Stormwater Modification Lot #4 At: 12030
ALG Simple Method - Volume Required / Provided Calculations
OPTION #1:
_Storage Volume - SA Waters -1.5" Runoff
Volume of Runoff = V = (3630) (Design Rainfall Depth) (Rv) (Drainage Area)
where
Rv = 0.05+0.009(IA)
Rv = Runoff Coefficient = storm runoff (inches) I storm rainfall (incises)
IA = Impervious Fraction = Impervious portion of the drainage area (acres) / Drainage area farres)
IA= 72.7 %
Rv= 0.70
Design Rainfall Depth = 1.50 in.
Drainage Area = 0.12 acres
Volume Required = 447 ft'
PT2TION
Storage Volume - SA Waters - Pre -Development Runoff
1 -Year, 24 hour Runoff. Volume
Volume of Runoff = V - (3630) (Design Rainfall Depth) (Rv) (Drainage Area)
where
Rv= 0.05+0.009(IA)
Rv = Runoff Coefficient = storm runoff (inches) f storm rainfall (inches)
IA = Impervious Fraction = Impervious portion of the drainage area (acres) v Drainage area (acres)
Pre-Dev. Impervious Area = 0 ft,
Pre-Dev. Drainage Area = 5,075 ft'
I�= 000 %
Rv = 0,050
Design Rainfall Depth = 3.88 in.
Drainage Area = 0.12 acres
Volume = 82 ft'
Storage Volume - SA Waters - Post -Development Runoff
1 - Year, 24 hour Runoff Volume
Volume of Runoff = V = (3630) (Design Rainfall Depth) (Rv) (Drainage Area)
where
Rv = 0.05+0.0W(IA)
Rv = Runoff Coefficient = storm runoff (inches) / storm rainfall (inches)
IA= Impervious Fraction = Impervious portion of the drainage area (acres)! Drainage area (acres)
Post-Dev. Impervious Area = 3.690 ft2
Post-Dev. Drainage Area = 5,075 ft2
t�= 72.7 %
Rv- 0.704
Design Rainfall Depth = 3,88 in.
Drainage Area = 0.12 acres
Volume = 1.156 ft'
DIFFERENCE IN VOLUME BETWEEN PREIPOST (1YR, 24 HR) = 1,074 ft'
Volume Provided Rock Infiltration System)
Surface Area of Trench = 725 f12
Depth of Trench = 4.0 ft
Void Space = 0.44 (for Stone)
VOLUME PROVIDED = 1,276 W Vprovidad > VrequIred OK
Total Drainage Area
sq,ft. I acres
5,075 1 0.12
Post Development Impervious Area
Land Use
sq.ft.
I acres
Proposed Building
1,595
0.04
Concrete Porch Deck
995
0.02
Concrete Pool Deck
600
0.01
Future Impervious
Soo
0.01
Total
3,690
0.08
% impervious = 0.727
= 72.7%
REC IVED
NOV 02 2012
BY:
G:W!15%2012\12030.0cean Harb—, Esiatet SW ModNcefcs\12030 InhItration Trench Stomp Volume Cale 15inch 10 11-12

10/31/12 Harbour Watch Lot #4
ALG Filter Strip & Offline Bypass Waiver
(Half Infiltration Rate)
*NOTE., Calculations provided below are for the Vegetated
Filter Strip & Offline Bypass Waiver per NCDENR BMP
Manual Section 16.3.9(4). Option #4.
Design Option #4:
Infiltration Rate, Reported, inlhr:
4.30
Area, Bottom of trench, ft 2.
1,045
Volume Required, Total, ft :
1,074
Volume Provided in Trench, ft :
1,276
Runoff depth for 10 yr 24 hr storm, inches
7.00
Time to Drawdown 10yr volume, day:
0.46
Time to Drawdown 10yr volume, hr:
0.02
Proposed Impervious, Total, ft2:
3,690
Drainage Area, Total , ft2:
5,075
RVPost Development, Overall:
0.70
Volume of 10 yr. 24 hr storm, ft :
2,085
Volume infiltrated in 24 hours, ft :
4,494
Remaining volume to store, ft :
-2,408
Is the Volume Stored >= Min. Vol. (1.5" or iyrNhr pre/post)?
Y
Is Volume Provided >= Remain Vol. to Store?
Y
A 12030
G:\JOBS\2012112030 - Ocean Harbour Estates SW Mod\calcs\12030 - Filter Strip & Bypass Waiver Option 44

9/13112 Harbour Watch Stormwater Modification Lot #4 12030
ALG CN and C Values
PRE DEVELOPMENT
Determine Composite CN Value from TR-55 Table 2-2
'Soil Type: Sand
_Description HSG
CN
_A (ac)
CN x A
Impervious A
98
0.00
0.00
Woods (Fair) A
36
0.12
4.32
0.12
4.32
Composite CN Value
36
Pre Development Composite Runoff Coefficient
Description
C
A (ac)
C x A
Impervious
0.95
0.00
0
Woodlands (2%-7%u)
0.20
0.12
0.024
0.12
0.024
Composite C Value =
0.20
POST DEVELOPMENT
Determine Composite CN Value from TR-55 Table 2-2 'Soil Type: Sand
Description HSG_
CN
A (ac)
CN x A
_
Impervious
98
_
0,08
7.84
Open Space (Good) A
39
0.04
1.56
Woods (Good) A
30
0.00
0.00
0,12
9.40
Composite CN Value =
78
Post Development Composite Runoff Coefficient
Description C A (ac) C x A_
Impervious 0.95 0.08 0.08
Pastures, Grass (Sandy) 0.15 0.04 0.01
Woodlands (0%-2%) 0.10 0.00 0
0.12 0.082
Composite C Value = 0.68
Total Draina a Area
s . ft. I acres
5,075 0.12
Post Development Impervious Area
Land Use
s . ft. I
acres
Propose Building
1.595
0.04
Concrete Porch Deck
995
0.02
Concrete Pool Deck
600
0.01
Future Impervious
500
0.01
Total
3.690
0.08
% impervious = 0.727
= 72.7%
G:uOBS12012%12030- Ocean Harbour Esfales SW ModlcalcMi2030-CN 8 C Value Calcs 9.13-12

Revised: 10/31/12 Harbour Watch Lot #4 12030
ALG Stormwater Infiltration Trench Routing
1-year 24hr Storm
WATERSHED DATA
BEFORE DEVELOPMENT
WATERSHED AREA
0.12 ACRES
HYDRAULIC LENGTH
100 FT
CHANGE IN HEIGHT
6 FT
RUNOFF COEF.'C'
0.2
TIME OF CONCENTR
5.00 MIN
INTENSITY 1 YR
4.87 IN1HR
Qa = 0.12 CFS
Oa = PRE -DEVELOPED PEAK DISCHARGE
COMPUTE DEPTH OF RUNOFF
P = 3,88 INCHES 1yr, 24hr PRECIPITATION
CN = 78
S = (10001CN)-10
S = 2.82
Depth (D) = (P-0.2S)A21(P+0.8S)
D = 1.79 IN - 1yr, 24hr RUNOFF DEPTH
SET VOLUME AND COMPUTE TIME TO PEAK
Tp = ((43.5)(D)(Area)] 1 Qp
Tp = 23.54 MINUTES
Storage Volume Req'd = (Qp-Qa)'Tp 1.39'60
= 551 cu. ft.
CALCULATE Ks AND b
SET NORMAL ELEVATION AT = 20.50 feet
AFTER DEVELOPMENT
WATERSHED AREA
0.12 ACRES
HYDRAULIC LENGTH
100 FT
CHANGE IN HEIGHT
6 FT
RUNOFF COEF.'C'
0.68
TIME OF CONCENTR
5.00 MIN
INTENSITY 1 YR
4.87 INIHR
Qp = 0.40 CFS
Op = POST -DEVELOPED PEAK DISCHARGE
S
Z
CONTOUR
INCR
ACCUM
CONTOUR
AREA
VOL
VOL
STAGE
In S -
In Z
Z est
(sq ft)
(cu ft)
(cu ft)
(ft)
(ft)
20.50
319
0
0
0
0
0
0
22.50
319
638
638
2.0
6.4583
0.6931
2.00
23.50
319
319
957
3.0
6.8638
1.0986
3.00
24.50
319
319
1.276
4.0
7.1515
1,3863
4,00
'NOTE: Contour Area includes 44% Void Ratio for stone.
Regression Output:
==> Ks = 319
b = 1.00
X Coefficient 5.77
0MOB54012t52030 - Ocean Harbour Estates SW MoclealcsSCopy of 12030 Infiltration Tranch Routing ty24hr 10.31-12

Revised: 10/31112 Harbour Watch Lot #4
ALG Stormwater Infiltration Trench Routing
1-year 24hr Storm
12030
CHAINSAW METHOD FOR
RISER BARREL. ROUTING
STORM DATA
Qa =
0.12 cfs
Qp =
0.40 CIS
Infiltration rate =
4! 3 in/hr
Tp =
23,5 min
(Per Soils Report)
dT =
1 min
BASIN DATA
Basin Drawdown Time = 41` l 6.9 hours
Ks =
319
(see Page 5 this report)
b =
1.00
Zo =
20.50 It
Normal water elev =
20.50 It
Peak Outflow =
0.00 cfs
Box Weir
Length =
0 tt
Peak Stage =
22.41 ft
Cw =
0.0
Maximum Storage =
610 cu A
Zcr =
0.00 ft
Control Holes:
State Orifice: Dia =
0.00 in
tad =
0 in
Inv =
0,00 ft
Cd =
0
Weir: L =
0 in
Zi =
0.00 It
Inv =
0.0 ft
Time
inflow
Storage
Stage
Outflow W Riser
Orifice Weir
IFStore
Infiltrate
(min)
(cfs)
(cu ft)
(It)
{c(s) (CIS)
(CIS)
(cfs)
(cu ft)
(CO
0
0.0
0
20.50
0 0
0
0.00
0.0
0.0
1
0.0
0
20.50
0 0.00
0
0.00
0.0
1.9
2
0.0
0
20.50
0.00 0.00
0.00
0.00
0.0
3.8
3
0.0
1
20.50
0.00 0. DO
0.00
0,00
0.0
5.7
4
0,0
1
20.50
0.00 0.00
0.00
0.00
0.0
7.6
5
0.0
3
20.50
0.00 0.00
0.00
0.00
0.0
9,5
6
0.1
6
20.50
0.00 0.00
0.00
0,00
0.0
11.4
7
0.1
9
20.50
0.00 0.00
0.00
0.00
0.0
13.3
8
0,1
14
20.50
0.00 0.00
0.00
0.00
0.0
15.2
9
0.1
20
20.51
0.00 0.00
0,00
0.00
12
17.1
10
0.2
28
20.53
0.00 0.00
0.00
0.00
8.9
19.1
11
0.2
37
20.55
0.00 0.00
0.00
0.00
16.1
21.0
12
0.2
48
20.58
0A0 0.00
0.00
0.00
24,9
22.9
13
0.2
60
20.61
0.00 0.00
0.00
0,00
35.3
24.8
14
0.3
74
20.65
0.00 0.00
0.00
0,00
47.3
26.7
15
0.3
89
20.69
O.OD 0.00
0.00
0.00
60.8
28.6
16
0.3
106
20,74
0.00 0.00
0.00
0.00
75.8
30.5
17
0,3
125
20.79
0.00 0.00
0.00
0.00
92.2
32.4
18
0.3
144
20.84
0.00 0.00
0.00
0.00
109.9
34.3
19
0.4
165
20.90
0.00 0.00
0.00
0.00
128.7
36,2
20
0.4
187
20.97
0.00 0.00
0.00
0.00
148.5
38.1
21
0.4
209
21.03
0.00 0.00
0.00
0.00
169.1
40.0
22
0.4
232
21.10
0.00 0.00
0.00
0.00
190.4
41.9
23
0.4
256
21.16
0.00 0.00
0.00
0.00
212.1
43.8
24
0.4
280
21.23
0.00 0.00
0.00
0.00
234.0
45.7
25
0.4
304
21.30
0.00 0.00
0.00
0.00
255.9
47.6
26
0.4
327
21.37
0.00 0.00
0.OD
0.00
277.6
49.5
27
0.4
350
21.44
0.00 0.00
0.00
0.00
298.9
51.4
28
0,4
373
21.50
0.00 0,00
0.00
0.00
319.6
53.3
29
0.3
395
21.56
0.00 0.00
0.00
0.00
339,5
55.2
30
0.3
416
21.62
0.00 0.00
0.00
0.00
368.4
57.2
31
0.3
435
21,68
0,00 0.00
0. DO
0.00
376.2
59.1
32
0.3
454
21.73
0.00 0.00
0.00
0.00
393.0
61.0
33
0.3
472
21.78
0.00 0.00
0,00
0.00
408.8
62.9
34
0.3
488
21.83
0.00 0.00
0.00
0,00
423.6
64.8
35
0.2
504
21.87
0.00 0,00
0.00
0.00
437.5
66.7
36
0.2
519
21.91
0.00 0.00
0.00
0,00
450.6
68.6
37
0.2
533
21.95
0.00 0.00
0.00
0.00
462.8
70.5
313
0.2
547
21.99
0.00 0.00
0.00
0.00
474,3
72,4
39
0,2
559
22.02
0.00 0.00
0,00
0,00
485,1
74.3
40
0.2
571
22.05
0.00 0.00
0,00
0.00
496.2
76.2
41
0.2
583
22.08
0.00 0.60
0.00
0.00
504.7
78.1
42
0.2
594
22.11
0.00 0,00
0.00
0.00
513.5
80.0
43
0.2
604
22.14
0,00 0.00
0.00
0.00
521.8
81.9
44
0.2
613
22.15
0.00 0.00
0.00
0.00
529.5
83.8
45
0.1
622
22.18
0.00 0.00
0.00
0.00
5367
85.7
46
0.1
631
22.20
D.00 0.00
0.00
0.00
543.4
87.6
47
0.1
639
22.22
0.00 0.00
0.00
0.00
549.7
89,5
G:UOBS12012512030 - Ocean harbour Estates SW MoMcalcslCopy of 12030 Witration Trench Routing 1 y24hr 10-31-12

Revised: 10/31/12
Harbour Watch Lot #4
12030
ALG
Stormwater Infiltration Trench Routing
1-year 24hr Storm
48
0.1
647
22.24
0,00
0.00
0.00
0.00
555.5
91.4
49
0.1
654
22.26
0,00
0.00
0.00
0.00
560.9
93.4
50
0.1
661
22.27
0.00
0.00
0.00
0.00
565.9
95,3
51
0.1
668
22.29
0.00
0.00
0.00
0.00
570.5
97.2
52
0.1
674
22.30
0.00
0,00
0.00
0.00
574.8
99.1
53
0.1
680
22.31
0.00
0.00
0.00
0.00
5783
101.0
54
0.1
685
22.33
0.00
0.00
0.00
0,00
582.4
102.9
55
0.1
690
22,34
0,00
0.00
0.00
0.00
585.7
104.8
56
0.1
695
22.35
0.00
0.00
0.00
0.00
588.8
106.7
57
0.1
700
22.35
0.00
0.00
0.00
0.00
591.6
108,6
58
0.1
705
22.36
0.00
0.00
0.00
0.00
694.1
110.5
59
0.1
709
22.37
0.00
0.00
0.00
0.00
596.4
112.4
60
0.1
713
22.38
0.00
0.00
0.00
0.00
598.5
114.3
61
0.1
717
22.38
0.00
0.00
0.00
0.00
600.3
116.2
62
0.1
720
22.39
0.00
0.00
0.00
0.00
602.0
11 B.1
63
0,1
723
22.39
0.00
0.00
0.00
0.00
603.4
120.0
64
0.1
727
22AO
0.00
0.00
0.00
0.00
604.7
121.9
65
0.0
730
22.40
0.00
0.00
0.00
0.00
605.8
123.8
66
0.0
733
22AG
0.00
0.00
0.00
0.00
606.8
125.7
67
0.0
735
22.40
0.00
0.00
0.00
0.00
607.6
127.6
68
0.0
738
22.41
0.00
0.00
0,00
0.00
608.2
129.5
69
O,0
740
22.41
0.00
0.00
0.00
0.00
608.8
131.5
70
0.0
743
22.41
0.00
0.00
0.00
0.00
609,1
133.4
71
0.0
745
22A1
0.00
0.00
0.00
0.00
609.4
135.3
72
0.0
747
22.41
0.00
0.00
0.00
0.00
609.5
137.2
73
0.0
749
22.41
0.00
0.00
0.00
0.00
609.6
139.1
74
0.0
750
22.41
0.00
0.00
0.00
0.00
609.5
141,0
75
0.0
752
22.41
0.00
0.00
0.00
0.00
609.3
142.9
76
0,0
754
22.41
0.00
0,00
0.00
0.00
609.1
144.8
77
0.0
755
22.41
0.00
0.00
0.00
0.00
608,7
146.7
78
0.0
757
22.41
0,00
0.00
0.00
0,00
608.3
148.6
79
0.0
758
22,41
0.00
0.00
0.00
0,00
607.8
150.5
80
0.0
760
22.40
0.00
0.00
0,00
0.00
607.2
152.4
81
0.0
761
22.40
0.00
0.00
0.00
0.00
606.5
154.3
82
0.0
762
22.40
0.00
0.00
0.00
0.00
605.8
156.2
83
0.0
763
22.40
0.00
0.00
0.00
0.00
605.0
158.1
84
0.0
764
22.39
0.00
0.00
0.00
0.00
604.2
160,0
85
0.0
765
22.39
0.00
0.00
0.00
0.00
603.3
161,9
86
0,0
766
22.39
0.00
0.00
0.00
0.00
602.3
163.8
B7
0.0
767
22.38
0.00
0.00
0.00
0.00
601.3
165.7
88
0.0
768
22.38
0.00
0.00
0.00
0.00
600.2
167.7
89
0.0
769
22,38
0,00
0.00
GM
0.00
599.1
169,6
90
0.0
769
22.37
0.00
0.00
0.00
0.00
598.0
171.5
91
0.0
770
22.37
0.00
0.00
0.00
0.00
596.8
173.4
92
0.0
771
22.37
0.00
0.00
0.00
0.00
595.6
175.3
93
0.0
771
22.36
0.00
0.00
0.00
0.00
594.3
177.2
94
0,0
772
22.36
0.00
0.00
0.00
0.00
593,0
179.1
95
0.0
773
22.35
0.00
0.00
0.00
0.00
591.7
181.0
96
0.0
773
22.35
0.00
0.00
0.00
0.00
590.3
182.9
97
0.0
774
22.35
0.00
0.00
0.00
0.00
588.9
184.8
98
0.0
774
22.34
0.00
0.00
0.00
0.00
587.5
186.7
99
0.0
775
22.34
0,00
0.00
0.00
0.00
586.1
188,6
100
0.0
775
22.33
0.00
0.00
0,00
0.00
584.6
190.6
101
0.0
776
22.33
0.00
0.00
0.00
0.00
583.1
192.4
102
0.0
776
22.32
0.00
0.00
0.00
0.00
581,6
194.3
103
0.0
776
22.32
0.00
0.00
0.00
0.00
580.1
196.2
104
0.0
777
22.31
0.00
0.00
0.00
OM
578.5
198,1
105
0.0
777
22.31
O.OG
0.00
OM
0.00
576.9
200.0
106
0.0
777
22.30
0.00
0.00
0,00
0.00
575.3
201.9
107
0.0
778
22.30
0.00
0,00
0.00
0.00
573,7
2018
108
0,0
778
22.29
0.00
0,00
0.00
0.00
572.1
205.8
109
0,0
778
22.29
0.00
0.00
0.00
0.00
570.5
207.7
110
0.0
778
22.28
0.00
0.00
0.00
0.00
568.8
209.6
111
0.0
779
22.28
0.00
0.00
0,00
0.00
567.2
211.5
112
0.0
779
22.27
0.00
0.00
0.00
0.00
565,5
213.4
113
0.0
779
22.27
0.00
0.00
0.00
0.00
563,8
215.3
114
0.0
779
22.26
0.00
0,00
0.00
0.00
562.1
217.2
115
0,0
779
22.26
0.00
0.00
0.00
0,00
560.4
219.1
116
0.0
780
22.25
0.00
0.00
0.00
0.00
558.6
221.0
117
0.0
780
22.25
0.00
0.00
0.00
0.00
556.9
222,9
118
0.0
780
22,24
0.00
0.00
0.00
0.00
555.2
224.8
119
0.0
780
22.23
0.00
0.00
0.00
0.00
553,4
226.7
120
0.0
780
22.23
0.00
0.00
0.00
0.00
551,7
228.6
121
0.0
780
22.22
0.00
0.00
0.00
0.00
549.9
230.5
122
0.0
781
22.22
0,00
OAO
0.00
0.00
548.1
232.4
123
0.0
781
22.21
0.00
0.00
0,00
0,00
546.3
234.3
124
0.0
781
22.21
0.00
0.00
0.00
0.00
544.5
236.2
125
0.0
781
22.20
0.00
0,00
0.00
0.00
542.7
238.1
G16BS12012V120300.8cean Harbour etas SW Mo&2ac2Q�opy of
120304Q49ation Trench RouGhQOyr24hr 10-31-10.00
0.00
540.9
240.0

Revised: 10/31/12
Harbour Watch Lot #4
12030
ALG
Stormwater Infiltration Trench Routing
1-year 24hr Storm
127
0.0
781
22.19
0.00
0.00
0.00
0.00
539.1
242.0
128
0.0
781
22.18
0.00
0.00
0.00
0.00
537.3
243.9
129
0.0
761
22.18
0.00
0.00
MD
0.00
535.5
245.8
130
0.0
781
22.17
0.00
0.00
0.00
0.00
533,7
247.7
131
0.0
781
22,17
0.00
0,00
0.00
0.00
531.9
249.6
132
0.0
782
22.16
0.00
0,00
0.00
0.00
530.0
251.5
133
0.0
7B2
22.16
0.00
0.00
O.DO
0.00
528.2
253.4
134
0.0
782
22.15
0.00
0.00
0.00
0.00
526.3
255.3
135
0.0
782
22.14
0.00
0.00
0.00
0.00
524,5
257.2
136
0.0
782
22.14
0.00
0.00
0.00
0.00
522.7
259.1
137
0.0
782
22.13
0.00
0,00
0.00
0.00
520.8
261.0
138
0.0
782
22,13
0.00
0,00
0.00
0.00
519.0
262.9
139
0.0
782
22.12
0.00
0.00
0.00
0.00
517.1
264.8
140
0.0
782
22.12
0.00
0.00
0.00
0.00
515.3
266.7
141
0.0
782
22.11
0.00
0.00
0.00
0.00
513.4
268.6
142
0.0
782
22.10
0.00
0.00
0.00
0.00
511.5
270.5
143
0.0
782
22.10
0.00
0.00
0,00
6.00
509,7
272.4
144
0.0
782
22.09
0.00
0,00
0.00
0.00
507.8
274.3
145
0.0
782
22.09
0,00
0.00
0.00
0.00
505.9
276.2
146
0.0
782
22.08
0.00
0.00
0.00
0.00
504,1
278.2
147
0.0
782
22.07
0.00
0.00
0.00
0.00
502.2
280.1
148
0.0
782
22.07
0.00
0.00
0.00
0A0
500.3
282.0
149
0.0
782
22.06
0.00
0.00
0.00
am
498.4
283.9
150
0.0
782
22.06
0.00
0.00
O,OD
0.00
496.6
285,8
151
0.0
782
22.05
0.00
0.00
0.00
0.00
494.7
287.7
152
0.0
782
22.04
0.00
0.00
0.00
0.00
492.8
289.6
153
0.0
782
22.04
0.00
0.00
0,00
0.00
490.9
291.5
154
0.0
782
22.03
0.00
0.00
0.00
0.00
489.0
293.4
155
0.0
782
22.03
D.DD
0.00
0A0
0.00
487.1
295.3
156
0.0
782
22.02
0.00
0.00
0.00
0.00
4B5.3
297.2
157
0.0
782
22.02
0.00
0.00
0.00
0.00
483.4
299.1
158
0,0
783
22.01
0.00
0.00
0.00
0.00
481.5
301.0
159
0.0
783
22.00
0.00
0,00
0.00
0.00
479.6
302.9
160
0.0
783
22.00
0.00
0.00
0.00
0.00
477.7
304.8
161
0.0
783
21.99
0.00
0.00
0.00
0.00
475.8
306.7
162
0.0
783
21.99
0.00
0.00
0.00
0.00
473.9
308.6
163
0.0
783
21.98
0.00
0.00
0.00
0.00
472.0
310.5
164
0,0
783
21.97
0,00
0.00
0.00
0.00
470,1
312.4
165
0.0
783
21.97
0.00
0.00
0.00
0.00
468.3
314.3
166
0.0
783
21,96
0.00
0.00
0.00
0.00
466.4
316.3
167
0.13
763
21.96
0.00
0,00
0.00
0.00
464.5
318.2
168
0.0
783
21.95
0.00
0.00
0.00
0.00
462.6
320.1
169
0.0
783
21_94
0.00
0.00
0.00
0.00
460,7
322.0
170
0.0
783
21.94
0.00
0.00
0.00
0.00
458.8
323.9
171
0.0
783
21.93
0.00
0.00
0.00
0.00
456.9
325.8
172
0.0
783
21.93
0.00
0.00
0.00
0.00
455.0
327.7
173
0.0
783
21.92
0.00
0.00
0.00
0.00
453,1
329.6
174
0.0
783
21,91
0.00
0.00
0.00
0.00
451.2
331.5
175
0.0
783
21.91
0.00
0.00
0.O0
0.00
449.3
333.4
176
0.0
783
21.90
0.00
0.00
0.00
0.00
447.4
335.3
177
0.0
783
21.90
0.00
0.00
0.00
0.00
445.5
337.2
178
0.0
783
21.89
0.00
0.00
0.00
0.00
443.6
339.1
179
0.0
783
21.88
0.00
0.00
0.00
0.00
441.7
341.0
180
0.0
783
21.88
0.00
0.00
0.00
0.00
439.8
342.9
181
0.0
783
21.87
0.00
0.00
0.00
0.00
437.9
344.8
182
0.0
763
21.87
O.OD
0.00
0.00
0.00
436,0
346.7
183
0.0
783
21.86
0.00
0.00
0.00
0.00
434.1
348.6
184
0.0
783
21.85
0.00
0.00
0.00
0.00
432.2
350.5
185
0.0
783
21.85
0.00
0.00
0.00
0.00
430.3
352.5
186
0.0
783
21,84
0.00
0.00
0.00
0.00
428.4
354.4
187
0.0
783
21,84
0.00
0,00
0.00
0.00
426.5
356.3
188
0.0
783
21,83
0.00
0.00
0.00
0.00
424.6
358.2
189
0.0
783
21.83
0.00
0.00
0.00
0.00
422.7
360.1
190
0.0
783
21.B2
0.00
0.00
0.00
0.00
420.8
362.0
191
0.0
783
21.81
0.00
0.00
GM
0.00
418.9
363.9
192
0.0
783
21.81
0.00
0.00
0.00
0.00
417.0
365.8
193
0.0
783
21.80
0.00
0,00
0.00
0.00
415.1
367.7
194
0.0
783
21.80
0.00
0.00
D.OD
0.00
413.2
369,E
195
0.0
783
21.79
OM
0.00
0.00
0.00
411.3
371.5
196
0.0
783
21.78
0,00
0.00
0,00
0,00
409.4
373.4
197
0.0
783
21.78
0.00
0.00
0.00
0.00
407.5
375.3
198
0.0
783
21.77
0.00
0.00
0.00
0,00
405.6
377.2
199
0.0
783
21.77
0.00
0.00
0.00
0.00
403.7
379.1
200
0.0
783
21.76
0.00
D.00
0,00
0,00
401,8
381.0
GMOBSQ012112030 - Ocean Harbour Estates SW Mod%atcslCopy of 12030 InfiRratlon Trench Routing 1 yr24hr 10-31.12

Revised: 10/31/12
Harbour Watch Lot #4
ALG
Stormwater Infiltration Trench Routing
1-year 24hr Storm
390
0.0
783
20.62
0.00
0,00
0.00
0.00
39.8
743.0
391
0.0
783
20.62
0.00
0.00
0.00
0.00
37.9
744.9
392
0.0
783
20.61
0.00
0.00
0.00
0.00
36,0
746.8
393
0.0
783
20.61
0.00
OAO
0.00
&00
34,1
748.7
394
0.0
783
20.60
0.00
0,00
0.00
0.00
32.2
750.6
395
0.0
783
20.59
0.00
0.00
0.00
0,00
30.3
752.5
396
0.0
783
20.59
0.00
0.00
0.00
0.00
28.4
754,4
397
0.0
783
20.58
0.00
0.00
0.00
0.00
26.5
756.3
398
0.0
783
20.58
0.00
0,00
0.00
0.00
24.6
758.2
399
0.0
783
20.57
0.00
0.00
0.00
0.00
22,7
760.2
400
0.0
783
20.57
0.00
0.00
0.00
0.00
20.8
762.1
401
0,0
783
20.56
0.00
0.00
0.00
0.00
18.9
764.0
402
0.0
783
20.55
0.00
0.00
0.00
0.00
16.9
765.9
403
0.0
783
20.55
0.00
0.00
0.00
0.00
15.0
767.8
404
0.0
783
20,54
0.00
0.00
0.00
0,00
13.1.
769.7
405
0.0
783
20.54
0.00
0.00
0.00
0.00
11.2
771,E
406
0.0
783
20.53
0.00
0.00
0.00
0.00
9.3
773.5
407
0-0
783
20.52
0,00
0.00
0.00
0.00
7.4
775.4
408
0.0
783
20.52
0.00
0.00
0.00
0.00
5.5
777.3
409
0.0
783
20.51
0.00
0.00
0.00
0.00
3.6
779.2
410
0.0
783
20.51
0.00
0.00
0.00
0.00
1.7
7B1,1
rT20 50 7 `r, 0_00
uc i 0. D0 a ,
0 00r .
•t OAO
.., 0 0 ,
+ 5783:0,
412
0.0
783
20.50
0.00
>'r� .
0.00
0.00
b:av
0,0
tw 784.9
413
0.0
7B3
20.50
0.00
0.00
0.00
0.00
0,0
786.8
414
0.0
783
20,50
0.00
0.00
0.00
0.00
0.0
788.7
415
0.0
783
20.50
0.00
0.00
0.00
0.00
0.0
790.6
416
0.0
783
20.50
0.00
0.00
0.00
0.00
0.0
792.5
417
0.0
783
20.50
0.00
0.00
0.00
0.00
0.0
794.4
418
0.0
783
20.50
0.00
0.00
0.00
0.00
0.0
796.3
419
0.0
783
20.50
0.00
o.oa
0.00
0.00
0.0
798.3
420
0.0
783
20.50
0.00
0.00
0,00
0.00
0,0
800.2
421
0.0
783
20,50
0.00
0.00
0.00
0,00
0.0
802.1
422
0.0
7B3
20.50
0.00
0.00
0.00
0.00
0.0
804.0
423
0.0
783
20.50
0.00
0,00
0.00
0.00
0.0
805.9
424
0.0
783
20.50
0.00
0,00
0.00
0.00
OD
807.8
425
0.0
783
20.50
0,00
0.00
0.00
0.00
0-0
809.7
426
0.0
783
20.50
0.00
0.00
0.00
0.00
0.0
811.6
427
0.0
783
20.50
0.00
0.00
0.00
0.00
0,0
813.5
428
0.0
783
20.50
0.00
0.00
0.00
0.00
0.0
815.4
429
0.0
783
20.50
0.00
0,00
0.00
0.00
0.0
817.3
430
0.0
783
20.50
0.00
0.00
0.00
0.00
0.0
819.2
12030
G,UOBS12012112030 - Ocean Harbour Estates SW ModlcalcslCopy of 12030 Irrillration Trench Routing tyrl4hr 10-31-12

TE 12030
Stormwater Drainage Narrative
Harbour Watch Lot 4
RECEIVED
NOV O E 2012
BY:
The proposed Harbour Watch Lot 4 project is located within the master plan of the Ocean
Harbour Estates subdivision in Calabash, NC. The existing NCDENR stormwater permit
for the Ocean Harbour Estates subdivision is SW8 931204. The proposed infiltration
stormwater system for Lot 4 is designed to accommodate for additional impervious area
as previously allocated by the master permit. The allowable impervious area for Lot 4
per the master permit is 5,300 sf and drains to the "HC-1" Drainage Area BMP. In
addition to the allowable 5,300 sf of built -upon -area (BUA), the project requires an
additional 3,690 sf of BUA to be treated. Therefore an individual infiltration basin within
Lot 4 is proposed to treat the additional 3,690 sf of BUA. The proposed infiltration
trench has been designed to store the 10-yr, 24-hour storm event using one-half of the
infiltration rate reported in the soils report. Therefore waiving the State required off-line
bypass and vegetated filter strip (NCDENR BMP Manual Section 16.3.9(4); option 44).
See the at "Filter Strip & Offline Bypass Waiver" calculations that indicate that the
infiltration trench is sufficiently sized to meet the option 94 waiver.
The site is located at 1324 Harbour Watch Court, Calabash, NC 37763 and is owned by
Gilbert Lepsig. The Brunswick County Parcel ID # is 103415542593. The site drains to
the Intracoastal Waterway; classification SA, index #: 15-25, in the Lumber River Basin.

TRIPP ENGINEERING, P.C.
419 Chestnut Street
Wilmington, North Carolina 28401
Phone: [phone] • FAX: [phone]
November 1, 2012
NCDENR
Division of Water Quality
�,�
127 Cardinal Drive No V
Wilmington, NC 28405-3845
Attn: Ms. Kelly Johnson
Re: Permit No. SW8 121009 Harbour Watch Lot 4
Permit No. SW8 931204 Ocean Harbour Estates
TE 12030
Dear Kelly:
RECEIVED
NOV A 3 901Z
BY-
0 1201?
In response to your comments dated October 24, 2012, we offer the following:
SW8 121008
1. Attached to the resubmittal is an overall breakdown Project Summary reallocating
impervious and drainage areas for SW8931204 & SW8121008.
2. Calculations
a. The design intent to waive the filter strip and bypass per NCDENR BMP Manual
Section 16.3.9(4), Option #4. Attached to submittal are a revised Stormwater
Narrative clearly outlining the design intent along with revised calculations that
support the Option #4 waiver.
b. The approximate location of the soil boring has been added to Sheet C I and
labeled. The existing elevation at the boring location has also been noted.
C. We have attempted to contact Vince Lewis and are awaiting his call to setup a
time to conduct an inspection.
d. The mitigated post development rate of 0.00 cfs has been updated on the revised
Infiltration Supplement form.
3. Plans
a. Dimensions have been added to the revised infiltration trench on Sheet C1. The
depth, width, and invert information has been added to the infiltration trench
detail. The "3 ft" noted on the observation well detail has been removed.
b. The depth, width, invert information, perforated pipe invert, and distance of the
perforated pipe from each side of the trench has been added to the infiltration
trench detail.

c. A note has been added to the infiltration trench detail that denotes the minimum
separation from the bottom of the swale and the top of the trench is 0.5'.
d. The 50' Buffer from the MHW line has been added to the plan.
e. The wetlands have been labeled more clearly on the revised plan. The wetland
symbol has been added to the legend.
4. The trench size and dimensions have been revised and is now located at least 15, down
gradient from the house structure.
5. The overall master subdivision is Ocean Harbour Estates however the neighborhood of
the project site is located in the Harbour Watch development area. Therefore we intend
to keep the name of the project as "Harbour Watch Lot 4."
6. Permeable pavement will be installed in the driveway within Lot 4 however we are not
seeking impervious area reduction credit for it at this time.
S W 8 931204
1. Attached to the resubmittal is an overall breakdown Project Summary reallocating
impervious and drainage areas for SW8931204 & SW8121008. Page 3 of the
SW8931204 application has been revised to match the numbers shown on the overall
Project Summary breakdown.
Please review for approval and contact us with any questions, comments or if you
need additional information. Thank you.
Sincerely,
Tripp Engineering, P.C.
Lee Galloway
ALG:dcb
Enc.

r� 1
Johnson, Kelly
From:
Lee Galloway [[e-mail]]
Sent:
Wednesday, October 31, 2012 1:33 PM
To:
Johnson, Kelly
Subject:
RE: Ocean Harbour Estates, Stormwater
Attachments:
2012 10 mtg_notes 931204 to DENR.xlsx
Kelly,
I just realized what you were referring to in regards to our conversation below regarding Question #2a. The Option #2
that you see on the first page of the calcs (titled: Simple Method — Volume Required / Provided Calculations) is not
referring to the BMP 16.3.9 Waiver Option #2. That is simply showing the two different Simple Method Storage Volume
calcs for SA Waters. I will revise the stormwater narrative to clearly indicate which Waiver option we are choosing and
how to find the calculation that references it.
I've also attached the revised Meeting Notes spreadsheet with updated numbers that all match up. The revised
applications that I send in will match the numbers in the spreadsheet. See my notes to you in the spreadsheet that are in
red bold font.
I am trying to finish up your comments today and hopefully get everything back to you tomorrow. I will be out of the
office tomorrow and Friday.
Thanks!
Lee Galloway
Tripp Engineering, P.C.
(p) 910.763.5100
(f) 910.763.5631
I ee-trippe ng@ec. rr. com
NOTICE: This electronic correspondence and all attachments may contain privileged information intended only for the use of the
addressee. Any information contained within this correspondence is provided for your convenience. No assertion of accuracy is
made by Tripp Engineering, P.C. unless physical documents are obtained, sealed AND signed. User assumes all responsibility for use
of this digital information.
From: Johnson, Kelly [maiito:[e-mail]]
Sent: Wednesday, October 24, 2012 11:15 AM
To: Lee Galloway
Subject: RE: Ocean Harbour Estates, Stormwater
Lee,
Here are the answers to your questions:
#1: l am trying to get the current permit's HC-1 to match the sum of the onsite and offsite DA for Lot #4 (see attached
mtg notes)
#2a: The calculations talk about option #2 (the V page of the calcs)? In order to do #4 you would need to show the
calcs attached as "option 4".
2d: The supplement shows the post>pre? You can put the mitigated post value for that, and that should clear that up.

This should be pretty simple. Let me know if I am missing something...
X
From: Lee Galloway [maiIto: lee-trippengCalec.rr.com]
Sent: Wednesday, October 24, 2012 9:52 AM
To: Johnson, Kelly
Subject: RE: Ocean Harbour Estates, Stormwater
K1,
I have quick questions regarding comments #1, #2, & #4.
Comment #1: The way I read your comment, in the second column of the table for SW8 121008 you want me to add the
remaining drainage info that drains "Off -site" to HC-1 from Lot 4? In other words, the information that is on the plan in
the site data table under the SW8 931204 impervious info?
Comment #2: In the stormwater narrative, I noted in the last sentence of the first paragraph that the infiltration trench
was sized appropriately to store the 10-yr storm using the %: infiltration rate to waive the off line bypass and vegetated
filter strip requirement. Also included in the submittal were stormwater routing calculations showing the peak outflow
for the 10-yr storm at %: infiltration rate (outflow = 0.00). Can you please look through the submittal and make sure
these items were included in your copy?
Comment #4: The stormwater routing calcs indicate that the post development is less than the pre for the 10-yr storm.
Do you need something else?
Call me if you want to discuss.
Thanks!
Lee Galloway
Tripp Engineering, P.C.
(p) 910.763.5100
(f) 910.763.5631
[e-mail]
NOTICE: This electronic correspondence and all attachments may contain privileged information intended only for the use of the
addressee. Any information contained within this correspondence is provided for your convenience. No assertion of accuracy is
made by Tripp Engineering, P.C. unless physical documents are obtained, sealed AND signed. User assumes all responsibility for use
of this digital information.
From: Johnson, Kelly[mailto:[e-mail]]
Sent: Wednesday, October 24, 2012 8:54 AM
To: Lee Galloway
Subject: Ocean Harbour Estates, Stormwater
Lee,
The attached add info will be mailed today. It is pretty simple. I think some info was just inadvertently omitted from the
package. I have also attached drafts of the permits in case you want to review them. Again, they are not that
complicated, but there is a lot of information cross-referenced.
Kelly

*** My email has changed to kell .'ohnson ncdenr. ov
K.dL jokwSOI&
Kelly Johnson
Environmental Engineer
Division of Water Quality
Stormwater Permitting
127 Cardinal Drive Extension
Wilmington, NC 28405-3845
Office: 910.796.7331
Fax: [phone]
E-mail correspondence to and from this address may be subject to the North Carolina Public Records Law and may be
disclosed to third parties.

SW8 931204, Ocean Harbour Estates - Project Summary
October 22, 2012
Trench #
SW8 931204
Permit, 1/4/12*
SW8 931204
Permit, 10/X/12
SW8.121008
Permit, 10/X/12
DA w Imperv. To
SW8 931204***
DA w Imperv.
treated onsite
Drainage Area (ac)
HA-1
1.68
1.68
0.00
0.00
H B-1
3.71
3.71
0.00
0.00
HC-1
3.91
3.79
0.12
0.12
HD-1
1.58
1.58
0.00
0.00
Green Space
14.06
14.06
0.00
0.00
Total:
24.941
10.761
0.121
0.12
Drainage Area (ft)
HA-1
73,181
73,181
0
0
H B-1
161,608
161,608
0
HC-1
170,320
165,244
5,Q75
5,075
HD-1
68,825
68,825
0
Green Space
612,4541
612,4541
0
0
Total:
1,086,3861
1,086,386
Impervious Area (ac)
HA-1
0.50
0.50
0.00
0.60
HB-1
1.38
1.38
0.00
0.0
HC-1
1.46
1.46
0.12
0.0
HD-1
0.59
0.59
0.00
0
Total:
3.921
3.921
0.12
0.08
Impervious Area (ftz)
HA-1
21,826
21,826
0
0
HB-1
59,928
59,92$
0
HC-1
63,401
63,401
�,3
3, 90
HD-1
25,787
25,787
Total:
1 170,9421
170,9421
8,990
*1/4/12: Permit was renewed, and the permeable pavement option was added. Design dat
from 5/31/02 remained in effect . e
*** This amount has been allocated to SW8 121008 by SW8 931204.
RECEIVED
NOV 02 2012
BY:
ttlpl \'-)�
The 2002 permit contained conflicting data between the application and the permit. During the 2012 modification, the data was
clarified and is summarized above.

Beverly Eaves Perdue
Governor
MCDEN�
North Carolina Department of Environment and Natural Resources
Division of Water Quality
Charles Wakild, P, E. Dee Freeman
Director Secretary
October 24, 2012
Mr. Gilbert G. Lepsig, Owner
Harbour Watch Lot 4 (permit number SW8 121008)
408171h Street
Sunset Beach, NC 28468
Mr. Daniel Johnston, President
Ocean Harbour Estates Association (permit number SW8 931204)
PO Box 4817
Calabash, NC 28467
Subject: Request for Additional Information
Stormwater Project No. SW8 121008 (Harbour Watch Lot 4)
Stormwater Project No. SW8 931204 (Ocean Harbour Estates)
Brunswick County
Dear Gentlemen:
The Wilmington Regional Office received and accepted the two State Stormwater Management Permit applications
for the subject projects on October 10, 2012. Lot 4 is applying for a permit to drain partially to SW8 931204 and to
drain partially to its own onsite infiltration trench. SW8 121008 will cover the new, onsite infiltration trench. SW8
931204 is being modified to accommodate the change under SW8 121008. A preliminary in-depth review of that
information has determined that the application is not complete. The following information is needed to continue the
stormwater review:
SW8 121008:
1. Drainage Areas: Please provide a breakdown of drainage area data in the table of Section IV(10) showing
all of the applicable data (drainage area, impervious area, etc) for a.) The drainage to SW8 931204, and b,)
The onsite drainage area.
Calculations:
a. Design Options: There are four infiltration design options. The calculations show that the design is
intended to comply with option #2. However, the volume and drawdown times are not computed
per option #2, and it does not appear that an offline bypass is provided. This design was perhaps
intended to comply with one of the other options. Please clarify your intent in your resubmittal and
ensure that the appropriate supporting calculations are provided.
b. Soils Report: Please provide the elevation of the boring used in.determining the SHWT,
c. Soil Scientist: Vince Lewis' site visit report is not on file. Please schedule a site visit with him if
you have not done so already. He can be reached at 910.796.7378.
d. Pre & Post Development Discharge Rates: Please check these rates and provide updated
calculations if necessary. The post development (mitigated) rate should be less than the pre -
development rate.
r
Wilmington Regional Once
127 Cardinal Drive Extension, Wilmington, North Carolina 28405 One
Phone: [phone] FAX: [phone] DENR Assistance: 1-877-623-6748 NorthCarolina
Internet: www.ncwaterqualityorg Naturally
An Eoual 0coodunity 1 Affirmative Action Emolover 6/ V `L Li"LU!

.N
3. Plans:
a. Trench Dimensions: Please show the length, width (both dimensions), and height of the trench on
the plan. Please also clarify why groundwater is shown to be within 3ft of the surface in the
observation well detail. That is inconsistent with the soils report.
b. Trench Elevations: Please show the bottom, top, overflow, perforated pipe invert, distance of the
perforated pipe from each side of the trench, and other pertinent elevation data on the plans.
c. Swale: A 3:1 swale is shown along the southern portion of the infiltration trench draining towards
the yard inlet into the trench, but this swale is not shown on the cross section. Please show the
depth of the swale in relation to the top of the trench.
d. Buffer: Please show the 50ft buffer from the MHW line.
e. Wetlands: Please either label wetlands on the plan or provide a note that they do not exist onsite.
4. Trench Location: The plans show that the trench will be 12" from the home. The BMP manual recommends
placing the infiltration trench 15ft down -gradient from any structure. Please provide a sealed statement that
the structural integrity of the home will not be compromised by the stormwater structure.
5. Project Name: The proposed project is "Harbour Watch Lot 4". Please clarify whether or not the intended
title was "Ocean Harbour Estates Lot 4" because it is part of a larger permit called "Ocean Harbour Estates".
6. Permeable Pavement: Permeable pavement is shown on the plans in the drainage area to SW8 931204,
but it does not look like the project is seeking impervious area credit. If you intend to seek impervious area
credit in the area draining to SW8 931204 please apply to the HOA for that credit in the process outlined in
the SW8 931204 permit.
SW8 931204:
1. General: If any data changes for SW8 121008, please be sure to update SW8 931204 appropriately and
vice versa.
Please remember that a change to one number may have a domino effect on other numbers. Please check all plans,
calculations and forms to ensure that the numbers are consistent throughout. Please note that this request for
additional information is in response to a preliminary review. The requested information should be received in this
Office prior to November 26, 2012, or the application will be returned as incomplete.
The return of a project will necessitate resubmission of all requited items, including the application fee. If you need
additional time to submit the information, please mail, email or fax your request for a time extension to the Division at
the address and fax number at the bottom of this letter. The request must indicate the date by which you expect to
submit the required information. The Division is allowed 90 days from the receipt of a completed application to issue
the permit.
The construction of any impervious surfaces, other than a construction entrance under an approved Sedimentation
Erosion Control Plan, is a violation of NCGS 143-215.1 and is subject to enforcement action pursuant to NCGS 143-
215.6A.
Please reference the State assigned project number on all correspondence. Any original documents that need to be
revised have been sent to the engineer or agent. All original documents must be returned or new originals must be
provided. Copies are not acceptable.
PaLye 2 of 3

I.
If you have any questions concerning this matter please feel free to call me at [phone] or email me at
[e-mail].
V
ngineer
GDSlkpj: S:IWQ&Stormwater\Permits & Projects120121121008 HD1201210 addinfo 121008
SAWQ&Stormwater Permits & Projects119931931204 HD12012 10 addinfo 931204
cc: Phil Tripp, PE
Wilmington Regional Office Stormwater File, SW8121008
Wilmington Regional Office Stormwater File, SW8 931204
Pap-e 3 of 3

TE 12030
Stormwater Drainage Narrative
Harbour Watch Lot 4
The proposed Harbour Watch Lot 4 project is located within the master plan of the Ocean
Harbour Estates subdivision in Calabash, NC. The existing NCDENR stormwater permit
for the Ocean Harbour Estates subdivision is SW$ 931204. The proposed infiltration
stormwater system for Lot 4 is designed to accommodate for additional impervious area
as previously allocated by the master permit. The allowable impervious area for Lot 4
per the master permit is 5,300 sf and drains to the "HC-l" Drainage Area BMP. In
addition to the allowable 5,300 sf of built -upon -area (BUA), the project requires an
additional 3,690 sf of BUA to be treated. Therefore an individual infiltration basin within
Lot 4 is proposed to treat the additional 3,690 sf of BUA. The proposed infiltration
trench has been designed to store the 10-yr, 24-hour storm event to waive the NCDENR
requirement for an offline bypass & vegetated filter strip.
The site is located at 1324 Harbour Watch Court, Calabash, NC 37763 and is owned by
Gilbert Lepsig. The Brunswick County Parcel ID # is 103415542593. The site drains to
the Intracoastal Waterway; classification SA, index #: 15-25, in the Lumber River Basin.
ECEG96E
OCT 10 2012
BY:

Completeness Review CRIecklist
Project Name: Q Received Date:
Project Location: Accepted Date:
Rule(s) 2008 Coastal El1995 Coastal Phase II (WiRO) Universal ❑v IT88 Coastal
Type of Permit: New or Mod or PR Existing Permit # (Mod or PR): ElPE Cert on File?
Density: HD or LD Type: Commercial or Residential �NCG:
%: 00) Stream Class: 11SA Map 1-10ffsite to SW8
Subdivided?: Subdivision or Single Lot IMORW Map r lExempt
Paperwork Emailed Engineer on:
E]Supplement(s) (1 original per BMP) BMP Type(s):
MO&M with correct/original signatures (1 original per BMP except LS/VFS and swales)
Application with correct/original signatures
Corp or LLC: Sig. Auth. per SoS or letter Note to Reviewer:
505 (within 6mo) �Q G Ve A7)
n1-
Soils Report with SHWT ` I }
Calculations (signed/sealed)
�No obvious errors C
n� Density includes common areas, etc lL� t- � /
i
Deed Restrictions, if subdivided:
Signed & Notarized
—If nrrart Tamnlata Irnmm/Rar R HIVI M nr r1ar f n,'
Plans
�Z Sets
Grading
Vicinity Map
Legend
Infiltration
Soils Report
SHWT:
Bottom:
Visited:
Additional Information:
Permitted
BUA (sf)
DA (sf)
PP (el)
SHWT (el)
Depth (ft)
Details (roads, cul-de-sacs �
Wetlands: Delineated d 1Qoa a
ElLayout (proposed BUA c
EIDA Maps
Wet Pond
Soils Report
SHWT:
PP:
Pro
Cd
N
Matches Master
sf
sf
SA (sf)

TRIPP ENGINEERING , P.C.
419 Chestnut Street
Wilmington, North Carolina 28401
Phone: [phone] • FAX: [phone]
October 10, 2012
NCDENR
Division of Water Quality
127 Cardinal Drive
Wilmington, NC 28405-3845
Attn: Ms. Kelly Johnson
Re: Harbour Watch Lot 4 & Ocean Harbour Estates
Permit No. SWS 931204
TE 12001
Dear Kelly:
We are requesting an individual stormwater permit for the infiltration trench at
Lot 4 Harbour Watch as well as a modification to the existing Ocean Harbour Estates
subdivision (SW8 931204) to accommodate the additional proposed impervious area for
the site. Enclosed please find the following items for review:
• 2 sets of plans
• (2) $505 checks
• Narrative
• Stormwater application — Ocean Harbour Estates
• Stormwater application — Harbour Watch Lot 4
• Infiltration Trench Supplement
• Infiltration Trench Operation and Maintenance Agreement
• 2 sets of calculations
• USGS map
• Soils report
• Copy of the Deed
�cF=uVE
OCT 10 2012
k31':
Please review for approval and contact us with any questions, comments or if
you need additional information. Thank you.
Sincerely,
Tripp Engineering, P.C.
Lee.Galloway
ALG:dcb
Eric.

t
Johnson, Kelly
IIII
From: Johnson, Kelly
Sent: Wednesday, September 12, 2012 1:06 PM
To: 'Lee Galloway'
Subject: FW: Ocean Harbour Single Lot Permit
Attachments: 2012 01 permit 931204.docx; Single Lot Permit.pdf; Permeable Pavement Process.pdf
Lee,
I looked back through this file. Since we don't have drainage area maps, supplements, etc for this project we will have to
just work with what we have. Since it looks like Mr. Lepsig's lot (Lot 4) is in DA HC-1, then please fill out the application
form reflecting the data on the most recent permit from 5/31/02 permit (the 2012 renewal didn't recap all of the
technical data from 2002). In doing this, please identify the amount of DA that will be removed from the master permit
and covered under the individual permit and reflect that in the total. For instance, HC-1's DA in the 2002 permit is
3.91ac. If .41ac is going to be covered by the individual permit, then show that the DA to HC-1 on the master permit's
application to be 3.5ac. Then include some sort of note in the narrative that since the DA is decreasing the existing
infiltration trench for HC-1 will be sufficient. This is obviously not the ideal way to do this because we won't be able to
document the exact changes to the trench design. But, since we don't know the original design details from 1993 we
will have to go with what we have. Then, for the master show the drainage area line through Lot 4 on a plan sheet and
we will stamp that approved under the master permit file. If there is BUA allocated to Lot 4 that won't be used in the
design, then stick that under a "future" allocation that can drain to the master permit to max out the allowed BUA to
that permit as we discussed. For the individual permit please show the same DA line on those plans. The individual
permit will be pretty much like a standard stand-alone HD permit.
Thanks,
KJ
From: Johnson, Kelly
Sent: Tuesday, September 11, 2012 3:46 PM
To: 'Lee Galloway'
Subject: RE: Ocean Harbour Single Lot Permit
Lee,
Here is their renewal permit allowing permeable pavement, the process for permeable pavement projects, and also my
notes on how the process will work for a single lot permit based on discussions we have had to date.
KJ
From: Lee Galloway [malito;[e-mail]]
Sent: Tuesday, September 11, 2012 3:26 PM
To: Johnson, Kelly
Subject: RE: Ocean Harbour Single Lot Permit
Kelly,
If you are around this afternoon, do you have a minute to talk about this project? If so, can you give me a shout?
Just want to make sure we are on the same page before we get knee deep in design. I'll be here till 5:00.
Thanks.
Lee Galloway
Tripp Engineering, P.C.
(p) 910.763.5100

(f) 910.763.5631
[e-mail]
NOTICE: This electronic correspondence and all attachments may contain privileged information intended only for the use of the
addressee. Any information contained within this correspondence is provided for your convenience. No assertion of accuracy is
made by Tripp Engineering, P.C. unless physical documents are obtained, sealed AND signed. User assumes all responsibility for use
of this digital information.
From: Johnson, Kelly[mailto:[e-mail]]
Sent: Monday, September 10, 2012 1:43 PM
To: Lee Galloway
Subject: RE: Ocean Harbour Single Lot Permit
OK. It really isn't going to be that hard, it is just a lot of detail work.
KJ
From: Lee Galloway [mailto:[e-mail]]
Sent: Monday, September 10, 2012 1:22 PM
To: Johnson, Kelly
Subject: Ocean Harbour Single Lot Permit
Kelly,
Just wanted to drop you a line and let you know that we are working on the stormwater permit for Gibby Lepsig in
Ocean Harbour (see attached email).
I'm working on it this week. Once I get our site plan together I may try to touch base with you to discuss a question I
have regarding one of your previous emails regarding the permit.
Hope you had a good weekend. Talk to you soon.
Thanks.
Lee Galloway
Tripp Engineering, P.C.
419 Chestnut Steet
Wilmington, NC 28401
(p) 910.763,5100
(f) 910,763.5631
lee-trippeng(@ec.rr.com
NOTICE: This electronic correspondence and all attachments may contain privileged information intended only for the use of the
addressee. Any information contained within this correspondence is provided for your convenience. No assertion of accuracy is
made by Tripp Engineering, P.C. unless physical documents are obtained, sealed AND signed. User assumes all responsibility for use
of this digital information.