20080950 Ver 2_More Info Received_20080922

LETTER OF TRANSMITTAL
DEVELOPMENT CONSULTING SERVICES, INC.
1401 Aversboro Road, Suite 206
Garner, North Carolina 27529
[phone] phone
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To: Annette Lucas From: Matt Collins
Company: NCDWQ Date: Friday, September 19, 2008
Address: 2321 Crabtree Boulevard, Ste. 250
Raleigh, NC 27604 RE: TT&E

URGENT F-1 Reply ASAP F-1 Please Comment Please Review 4 As Requested
COPIES DATE NO. DESCRIPTION
1 Response Letter
1 Drainage Area #1 Calculations
1 Drainage Area #3 Calculations
1 CD w/ PDFs of Plans
3 Plan Sets

Comments:

DEVELOPMENT CONSULTING SERVICES, INC.
1401 Aversboro Road, Suite 206
Garner, North Carolina 27529
Ph. [phone]
Friday, September 19, 2008
Mr. Ian McMillan
NC Division of Water Quality
Central Office
401 Oversight/Express Review Permitting Unit
2321 Crabtree Boulevard, Suite 250
Raleigh, North Carolina 27604
RE: Request for More Information
TT&E Iron & Metal
DWQ Project #: 08-0950
Dear Mr. McMillan:
The following are a list of responses to the comments generated by your office dated September 12, 2008.
Design of Level Spreader #I (treating Drainage Area #3) has been revised based on wooded
vegetation. Based on a phone conversation with Ms. Annette Lucas on Tuesday, September 16`n
stormwater runoff from the proposed private access road begins to channelize at approximately the
328 contour. The drainage area being treated has been revised to treat this area and the level
spreader has been sized accordingly. A full design of this drainage area/level spreader is included
in the attached calculations.
We are no longer proposing a Scour Hole to treat Drainage Area # 1. Due to the existing
topography of the site, as well as the outlet elevation for the proposed Detention Pond # 1, we are
unable to utilize a scour hole or a level spreader in this area. Mr. Keith Roberts, PE spoke with
Ms. Lucas on Thursday, September 18`n and it was determined that the best solution would be to
reduce the flow velocity of the outlet pipe to less than 2 ft/s using a dissipator pad. After the
dissipater pad, discharge flow from the outlet pipe would enter the wetlands before being
conveyed to the buffer.
The southeast portion of the project does not involve any new impervious area. The attached
plans have been revised to clearly distinguish existing features from proposed ones. The existing
pavement in the southeast portion of the project was present prior to implementation of the Neuse
River Basin (NRB) Buffer Rules in 1997 and has been ongoing. Therefore, this existing use
should be exempt from those rules.
We appreciate the opportunity to have provided you with our services on this phase of the project. If you
have any questions concerning this letter or if we can assist you on any other phase of the project please do
not hesitate to contact us.
Develop ent C suiting Services, Inc.
Matt Collins, El Keith Roberts, P.E.
DRAINAGE AREA #1
DESIGN CALCULATIONS
TT&E IRON & METAL
GARNER, NORTH CAROLINA
SUBMITTED BY: DEVELOPMENT CONSULTING SERVICES, INC.
1401 AVERSBORO ROAD, SUITE 206
GARNER, NC 27529
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Pond Report
Hydraflow Hydrographs by Intelisolve Thursday, Sep 18 2008, 3:45 PM
Pond No. 1 - TT&E - POND 1
Pond Data
Pond storage is based on known contour areas. Average end area m ethod used.
Stage / Storage Table
Stage (ft) Elevation (ft) Contour area (sgft) Incr. Storage (cuft) Total storage (cuft)
0.00 325.00 01 0 0
1.00 326.00 7,937 3,969 3,969
2.00 327.00 8,782 8,360 12,329
3.00 328.00 9,665 9,224 21,552
Culvert / Orifice Structures Weir Structures
[A] [B] [C] [D] [A] [B] [C] [D]
Rise (in) = 18.00 15.00 0.00 0.00 Crest Len (ft) = 16.00 0.00 0.00 0.00
Span (in) = 18.00 15.00 0.00 0.00 Crest El. (ft) = 327.00 0.00 0.00 0.00
No. Barrels = 1 1 0 0 Weir Coeff. = 3.33 3.33 0.00 0.00
Invert El. (ft) = 324.85 325.00 0.00 0.00 Weir Type = Riser --- --- ---
Length (ft) = 62.00 0.00 0.00 0.00 Multi-Stage = Yes No No No
Slope (%) = 0.50 0.00 0.00 0.00
N-Value = .013 .013 .000 .000
Orif. Coeff. = 0.60 0.60 0.00 0.00
Multi-Stage = n/a Yes No No Exfiltration = 0.000 in/hr (Co ntour) Ta ilwater Elev. = 0.00 ft
Note: Culvert/Orifice outflows have been analyzed under inlet and outlet control. Weir riser checked for orifice conditions.
Stage (ft)
3.00
2.00
1.00
Stage / Storage
Stage (ft)
3.00
2.00
1.00
0 00 -'1 ' ' ' 1 1 1 1 1 1 1 1 0 00
0 2,000 4,000 6,000 8,000 10,000 12,000 14,000 16,000 18,000 20,000 22,000
Storage Storage (cuft)
Hydrograph Plot
Hydraflow Hydrographs by Intelisolve Thursday, Sep 18 2008, 3:45 PM
Hyd. No. 4
TT&E - POND 1
Hydrograph type = Reservoir Peak discharge = 4.69 cfs
Storm frequency = 10 yrs Time interval = 1 min
Inflow hyd. No. = 3 Max. Elevation = 326.77 ft
Reservoir name = TT&E - POND 1 Max. Storage = 10,374 cuft
Storage Indication method used.
Hydrograph Volume = 22,249 cult
TT&E - POND 1
Q (cfs) Hyd. No. 4 -- 10 Yr Q (cfs)
12.00
10.00
8.00
6.00
4.00
2.00
0.00
12.00
10.00
8.00
6.00
4.00
2.00
0 00
0 20 40 60 80 100 120 140 160 180 200 220 240
Time (min)
Hyd No. 4 Hyd No. 3 [.I..II]...I.I..I..1..]] Req. Stor = 10,374 cuft
Hydrograph Summary Report
Hyd.
No. Hydrograph
type
(origin) Peak
flow
(cfs) Time
interval
(min) Time to
peak
(min) Volume

(cuft) Inflow
hyd(s) Maximum
elevation
(ft) Maximum
storage
(cuft) Hydrograph
description
1 Manual 0.00 1 0 0 ---- ------ ------ MALCOM METHOD
2 Reservoir 0.00 1 0 0 1 0.00 0 <no description>
3 Rational 10.16 1 23 22,439 ---- ------ ------ TT&E - POND 1
4 Reservoir 4.69 1 50 22,249 3 326.77 10,374 TT&E - POND 1
TT&E1-ALTERNATE.gpw Return Period: 10 Year Thursday, Sep 18 2008, 3:46 PM
Hydraflow Hydrographs by Intelisolve
Hydrograph Report
Hydraflow Hydrographs by Intelisolve Thursday, Sep 18 2008, 3:46 PM
Hyd. No. 4
TT&E - POND 1
Hydrograph type = Reservoir Peak discharge = 4.69 cfs
Storm frequency = 10 yrs Time interval = 1 min
Inflow hyd. No. = 3 Reservoir name = TT&E - POND 1
Max. Elevation = 326.77 ft Max. Storage = 10,374 cuft
Storage Indication method used. Outflow hydrograph volume = 22,249 cuft
Hydrograph Discharge T able (Printed values -1%ofop.)
Time Inflow Elevation Clv A Clv B Clv C Clv D Wr A Wr B Wr C Wr D Exfil Outflow
(min) cfs ft cfs cfs cfs cfs cfs cfs cfs cfs cfs cfs
6 2.65 325.12 0.14 0.08 ----- ----- ----- ----- ----- ----- ----- 0.08
7 3.09 325.16 0.17 0.14 ----- ----- ----- ----- ----- ----- ----- 0.14
8 3.53 325.21 0.22 0.22 ----- ----- ----- ----- ----- ----- ----- 0.22
9 3.98 325.26 0.34 0.34 ----- ----- ----- ----- ----- ----- ----- 0.34
10 4.42 325.32 0.49 0.48 ----- ----- ----- ----- ----- ----- ----- 0.48
11 4.86 325.38 0.66 0.65 ----- ----- ----- ----- ----- ----- ----- 0.65
12 5.30 325.44 0.85 0.84 ----- ----- ----- ----- ----- ----- ----- 0.84
13 5.74 325.51 1.07 1.07 ----- ----- ----- ----- ----- ----- ----- 1.07
14 6.19 325.59 1.32 1.32 ----- ----- ----- ----- ----- ----- ----- 1.32
15 6.63 325.66 1.58 1.58 ----- ----- ----- ----- ----- ----- ----- 1.58
16 7.07 325.74 1.87 1.87 ----- ----- ----- ----- ----- ----- ----- 1.87
17 7.51 325.82 2.17 2.17 ----- ----- ----- ----- ----- ----- ----- 2.17
18 7.95 325.90 2.49 2.49 ----- ----- ----- ----- ----- ----- ----- 2.49
19 8.40 325.98 2.82 2.79 ----- ----- ` ----- ----- ----- ----- ----- 2.79
20 8.84 326.03 2.99 2.97 ----- ----- ----- ----- ----- ----- ----- 2.97
21 9.28 326.08 3.13 3.12 ----- ----- ----- ----- ----- ----- ----- 3.12
22 9.72 326.12 3.28 3.28 ----- ----- ----- ----- ----- ----- ----- 3.28
23 10.16 << 326.17 3.45 3.44 ----- ----- ----- ----- ----- ----- ----- 3.44
24 9.96 326.22 3.60 3.58 ----- ----- ----- ----- ----- ----- ----- 3.58
25 9.76 326.26 3.71 3.69 ----- ----- ----- ----- ----- ----- ----- 3.69
26 9.55 326.30 3.81 3.80 ----- ----- ----- ----- ----- ----- ----- 3.80
27 9.35 326.34 3.90 3.89 ----- ----- ----- ----- ----- ----- ----- 3.89
28 9.15 326.38 3.99 3.97 ----- ----- ----- ----- ----- ----- ----- 3.97
29 8.94 326.42 4.06 4.04 ----- ----- ----- ----- ----- ----- ----- 4.04
30 8.74 326.45 4.13 4.11 ----- ----- ----- ----- ----- ----- ----- 4.11
31 8.54 326.48 4.20 4.18 ----- ----- ----- ----- ----- ----- ----- 4.18
32 8.33 326.51 4.25 4.24 ----- ----- ----- ----- ----- ----- ----- 4.24
33 8.13 326.54 4.30 4.29 ----- ----- ----- ----- ----- ----- ----- 4.29
34 7.93 326.57 4.35 4.35 ----- ----- ----- ----- ----- ----- ----- 4.35
35 7.72 326.59 4.40 4.39 ----- ----- ----- ----- ----- ----- ----- 4.39
36 7.52 326.62 4.44 4.44 ----- ----- ----- ----- ----- ----- ----- 4.44
37 7.32 326.64 4.48 4.48 ----- ----- ----- ----- ----- ----- ----- 4.48
38 7.11 326.66 4.51 4.51 ----- ----- ----- ----- ----- ----- ----- 4.51
39 6.91 326.68 4.54 4.54 ----- ----- ----- ----- ----- ----- ----- 4.54
40 6.71 326.69 4.57 4.57 ----- ----- ----- ----- ----- ----- ----- 4.57
41 6.50 326.71 4.60 4.60 ----- ----- ----- ----- ----- ----- ----- 4.60
42 6.30 326.72 4.62 4.62 ----- ----- ----- ----- ----- ----- ----- 4.62
43 6.10 326.73 4.64 4.64 ----- ----- ----- ----- ----- ----- ----- 4.64
2
Continues on next page...
3
TT&E - POND 1
Hydrograph Discharge Table
Time Inflow Elevation Clv A Clv B Clv C Clv D Wr A Wr B Wr C Wr D Exfil Outflow
(min) cfs ft cfs cfs cfs cfs cfs cfs cfs cfs cfs cfs
44 5.89 326.74 4.66 4.65 ----- ----- ----- ----- ----- ----- ----- 4.65
45 5.69 326.75 4.67 4.66 ----- ----- ----- ----- ----- ----- ----- 4.66
46 5.49 326.75 4.68 4.67 ----- ----- ----- ----- ----- ----- ----- 4.67
47 5.28 326.76 4.69 4.68 ----- ----- ----- ----- ----- ----- ----- 4.68
48 5.08 326.76 4.69 4.69 ----- ----- ----- ----- ----- ----- ----- 4.69
49 4.88 326.77 4.70 4.69 ----- ----- ----- ----- ----- ----- ----- 4.69
50 4.67 326.77 << 4.70 4.69 ----- ----- ----- ----- ----- ----- ----- 4.69 <<
51 4.47 326.77 4.70 4.69 ----- ----- ----- ----- ----- ----- ----- 4.69
52 4.27 326.76 4.69 4.69 ----- ----- ----- ----- ----- ----- ----- 4.69
53 4.07 326.76 4.69 4.68 ----- ----- ----- ----- ----- ----- ----- 4.68
54 3.86 326.75 4.68 4.67 ----- ----- ----- ----- ----- ----- ----- 4.67
55 3.66 326.75 4.67 4.66 ----- ----- ----- ----- ----- ----- ----- 4.66
56 3.46 326.74 4.65 4.65 ----- ----- ----- ----- ----- ----- ----- 4.65
57 3.25 326.73 4.64 4.64 ----- ----- ----- ----- ----- ----- ----- 4.64
58 3.05 326.72 4.62 4.62 ----- ----- ----- ----- ----- ----- ----- 4.62
59 2.85 326.71 4.60 4.60 ----- ----- ----- ----- ----- ----- ----- 4.60
60 2.64 326.69 4.58 4.58 ----- ----- ----- ----- ----- ----- ----- 4.58
61 2.44 326.68 4.55 4.55 ----- ----- ----- ----- ----- ----- ----- 4.55
62 2.24 326.66 4.52 4.52 ----- ----- ----- ----- ----- ----- ----- 4.52
63 2.03 326.65 4.49 4.49 ----- ----- ----- ----- ----- ----- ----- 4.49
64 1.83 326.63 4.46 4.46 ----- ----- ----- ----- ----- ----- ----- 4.46
65 1.63 326.61 4.42 4.42 ----- ----- ----- ----- ----- ----- ----- 4.42
66 1.42 326.59 4.39 4.38 ----- ----- ----- ----- ----- ----- ----- 4.38
67 1.22 326.57 4.35 4.34 ----- ----- ----- ----- ----- ----- ----- 4.34
68 1.02 326.54 4.31 4.30 ----- ----- ----- ----- ----- ----- ----- 4.30
69 0.81 326.52 4.26 4.25 ----- ----- ----- ----- ----- ----- ----- 4.25
70 0.61 326.49 4.22 4.20 ----- ----- ----- ----- ----- ----- ----- 4.20
71 0.41 326.47 4.17 4.15 ----- ----- ----- ----- ----- ----- ----- 4.15
72 0.20 326.44 4.11 4.09 ----- ----- ----- ----- ----- ----- ----- 4.09
73 0.00 326.41 4.05 4.03 ----- ----- ----- ----- ----- ----- ----- 4.03
74 0.00 326.38 3.99 3.97 ----- ----- ----- ----- ----- ----- ----- 3.97
75 0.00 326.36 3.93 3.91 ----- ----- ----- ----- ----- ----- ----- 3.91
76 0.00 326.33 3.87 3.85 ----- ----- ----- ----- ----- ----- ----- 3.85
77 0.00 326.30 3.81 3.80 ----- ----- ----- ----- ----- ----- ----- 3.80
78 0.00 326.27 3.74 3.73 ----- ----- ----- ----- ----- ----- ----- 3.73
79 0.00 326.25 3.68 3.66 ----- ----- ----- ----- ----- ----- ----- 3.66
80 0.00 326.22 3.62 3.59 ----- ----- ----- ----- ----- ----- ----- 3.59
81 0.00 326.20 3.55 3.52 ----- ----- ----- ----- ----- ----- ----- 3.52
82 0.00 326.17 3.46 3.44 ----- ----- ----- ----- ----- ----- ----- 3.44
83 0.00 326.15 3.37 3.36 ----- ----- ----- ----- ----- ----- ----- 3.36
84 0.00 326.12 3.29 3.28 ----- ----- ----- ----- ----- ----- ----- 3.28
85 0.00 326.10 3.20 3.20 ----- ----- ----- ----- ----- ----- ----- 3.20
86 0.00 326.08 3.13 3.12 ----- ----- ----- ----- ----- ----- ----- 3.12
87 0.00 326.05 3.06 3.05 ----- ----- ----- ----- ----- ----- ----- 3.05
88 0.00 326.03 2.99 2.97 ----- ----- ----- ----- ----- ------ ----- 2.97
89 0.00 326.01 2.92 2.90 ----- ----- ----- ----- ----- ----- ----- 2.90
90 0.00 325.98 2.81 2.79 ----- ----- ----- ----- ----- ----- ----- 2.79
91 0.00 325.94 2.65 2.64 ----- ----- ----- ----- ----- ----- ----- 2.64
92 0.00 325.90 2.50 2.50 ----- ----- ----- ----- ----- ----- ----- 2.50
93 0.00 325.86 2.36 2.36 ----- ----- ----- ----- ----- ----- ----- 2.36
94 0.00 325.83 2.22 2.22 ----- ----- ----- ----- ----- ----- ----- 2.22
Continues on next page...
4
TT&E - POND 1
Hydrograph Discharge Table
Time Inflow Elevation Civ A Clv B Clv C Clv D Wr A Wr B Wr C Wr D Exfil Outflow
(min) cfs ft cfs cfs cfs cfs cfs cfs cfs cfs cfs cfs
95 0.00 325.80 2.10 2.10 ----- ----- ----- ----- ----- ----- ----- 2.10
96 0.00 325.77 1.98 1.98 ----- ----- ----- ----- ----- ----- ----- 1.98
97 0.00 325.74 1.87 1.87 ----- ----- ----- ----- ----- ----- ----- 1.87
98 0.00 325.71 1.76 1.76 ----- ----- ----- ----- ----- ----- ----- 1.76
99 0.00 325.68 1.67 1.67 ----- ----- ----- ----- ----- ----- ----- 1.67
100 0.00 325.66 1.58 1.58 ----- ----- ----- ----- ----- ----- ----- 1.58
101 0.00 325.64 1.50 1.50 ----- ----- ----- ----- ----- ----- ----- 1.50
102 0.00 325.61 1.42 1.42 ----- ----- ----- ----- ----- ----- ----- 1.42
103 0.00 325.59 1.34 1.34 ----- ----- ----- ----- ----- ----- ----- 1.34
104 0.00 325.57 1.27 1.27 ----- ----- ----- ----- ----- ----- ----- 1.27
105 0.00 325.55 1.21 1.21 ----- ----- ----- ----- ----- ----- ----- 1.21
106 0.00 325.54 1.15 1.15 ----- ----- ----- ----- ----- ----- ----- 1.15
107 0.00 325.52 1.09 1.09 ----- ----- ----- ----- ----- ----- ----- 1.09
108 0.00 325.50 1.03 1.03 ----- ----- ----- ----- ----- ----- ----- 1.03
109 0.00 325.49 0.99 0.98 ----- ----- ----- ----- ----- ----- ----- 0.98
110 0.00 325.47 0.94 0.94 ----- ----- ----- ----- ----- ----- ----- 0.94
111 0.00 325.46 0.90 0.89 ----- ----- ----- ----- ----- ----- ----- 0.89
112 0.00 325.45 0.86 0.85 ----- ----- ----- ----- ----- ----- ----- 0.85
113 0.00 325.43 0.83 0.81 ----- ----- ----- ----- ----- ----- ----- 0.81
114 0.00 325.42 0.79 0.78 ----- ----- ----- ----- ----- ----- ----- 0.78
115 0.00 325.41 0.76 0.74 ----- ----- ----- ----- ----- ----- ----- 0.74
116 0.00 325.40 0.72 0.71 ----- ----- ----- ----- ----- ----- ----- 0.71
117 0.00 325.39 0.69 0.68 ----- ----- ----- ----- ----- ----- ----- 0.68
118 0.00 325.38 0.66 0.65 ----- ----- ----- ----- ----- ----- ----- 0.65
119 0.00 325.37 0.64 0.62 ----- ----- ----- ----- ----- ----- ----- 0.62
120 0.00 325.36 0.61 0.60 ----- ----- ----- ----- ----- ----- ----- 0.60
121 0.00 325.35 0.58 0.58 ----- ----- ----- ----- ----- ----- ----- 0.58
122 0.00 325.34 0.56 0.55 ----- ----- ----- ----- ----- ----- ----- 0.55
123 0.00 325.34 0.54 0.53 ----- ----- ----- ----- ----- ----- ----- 0.53
124 0.00 325.33 0.51 0.51 ----- ----- ----- ----- ----- ----- ----- 0.51
125 0.00 325.32 0.49 0.49 ----- ----- ----- ----- ----- ----- ----- 0.49
126 0.00 325.31 0.47 0.47 ----- ----- ----- ----- ----- ----- ----- 0.47
127 0.00 325.31 0.45 0.45 ----- ----- ----- ----- ----- ----- ----- 0.45
128 0.00 325.30 0.43 0.43 ----- ----- ----- ----- ----- ----- ----- 0.43
129 0.00 325.29 0.42 0.42 ----- ----- ----- ----- ----- ----- ----- 0.42
130 0.00 325.29 0.40 0.40 ----- ----- ----- ----- ----- ----- ----- 0.40
131 0.00 325.28 0.39 0.39 ----- ----- ----- ----- ----- ----- ----- 0.39
132 0.00 325.27 0.38 0.38 ----- ----- ----- ----- ----- ----- ----- 0.38
133 0.00 325.27 0.36 0.36 ----- ----- ----- ----- ----- ----- ----- 0.36
134 0.00 325.26 0.35 0.35 ----- ----- ----- ----- ----- ----- ----- 0.35
135 0.00 325.26 0.34 0.34 ----- ----- ----- ----- ----- ----- ----- 0.34
136 0.00 325.25 0.33 0.33 ----- ----- ----- ----- ----- ----- ----- 0.33
137 0.00 325.25 0.31 0.31 ----- ----- ----- ----- ----- ----- ----- 0.31
138 0.00 325.24 0.30 0.30 ----- ----- ----- ----- ----- ----- ----- 0.30
139 0.00 325.24 0.29 0.29 ----- ----- ----- ----- ----- ----- ----- 0.29
140 0.00 325.24 0.28 0.28 ----- ----- ----- ----- ----- ----- ----- 0.28
141 0.00 325.23 0.27 0.27 ----- ----- ----- ----- ----- ----- ----- 0.27
142 0.00 325.23 0.26 0.26 ----- ----- ----- ----- ----- ----- ----- 0.26
143 0.00 325.22 0.25 0.25 ----- ----- ----- ----- ----- ----- ----- 0.25
144 0.00 325.22 0.24 0.24 ----- ----- ----- ----- ----- ----- ----- 0.24
145 0.00 325.22 0.24 0.24 ----- ----- ----- ----- ----- ----- ----- 0.24
Continues on next page...
5
TT&E - POND 1
Hydrograph Discharge Table
Time Inflow Elevation Clv A Clv B Clv C Clv D Wr A Wr B Wr C Wr D Exfil Outflow
(min) cfs ft cfs cfs cfs cfs cfs cfs cfs cfs cfs cfs
146 0.00 325.21 0.23 0.23 ----- ----- ----- ----- ----- ----- ----- 0.23
147 0.00 325.21 0.22 0.22 ----- ----- ----- ----- ----- ----- ----- 0.22
148 0.00 325.21 0.21 0.21 ----- ----- ----- ----- ----- ----- ----- 0.21
149 0.00 325.20 0.20 0.20 ----- ----- ----- ----- ----- ----- ----- 0.20
150 0.00 325.20 0.20 0.20 ----- ----- ----- ----- ----- ----- ----- 0.20
151 0.00 325.20 0.20 0.19 ----- ----- ----- ----- ----- ----- ----- 0.19
152 0.00 325.19 0.19 0.19 ----- ----- ----- ----- ----- ----- ----- 0.19
153 0.00 325.19 0.19 0.18 ----- ----- ----- ----- ----- ----- ----- 0.18
154 0.00 325.19 0.19 0.18 ----- ----- ----- ----- ----- ----- ----- 0.18
155 0.00 325.19 0.19 0.18 ----- ----- ----- ----- ----- ----- ----- 0.18
156 0.00 325.18 0.19 0.17 ----- ----- ----- ----- ----- ----- ----- 0.17
157 0.00 325.18 0.18 0.17 ----- ----- ----- ----- ----- ----- ----- 0.17
158 0.00 325.18 0.18 0.17 ----- ----- ----- ----- ----- ----- ----- 0.17
159 0.00 325.17 0.18 0.16 ----- ----- ----- ----- ----- ----- ----- 0.16
160 0.00 325.17 0.18 0.16 ----- ----- ----- ----- ----- ----- ----- 0.16
161 0.00 325.17 0.18 0.15 ----- ----- ----- ----- ----- ----- ----- 0.15
162 0.00 325.17 0.17 0.15 ----- ----- ----- ----- ----- ----- ----- 0.15
163 0.00 325.17 0.17 0.15 ----- ----- ----- ----- ----- ----- ----- 0.15
164 0.00 325.16 0.17 0.14 ----- ----- ----- ----- ----- ----- ----- 0.14
165 0.00 325.16 0.17 0.14 ----- ----- ----- ----- ----- ----- ----- 0.14
166 0.00 325.16 0.17 0.14 ----- ----- ----- ----- ----- ----- ----- 0.14
167 0.00 325.16 0.17 0.14 ----- ----- ----- ----- ----- ----- ----- 0.14
168 0.00 325.15 0.16 0.13 ----- ----- ----- ----- ----- ----- ----- 0.13
169 0.00 325.15 0.16 0.13 ----- ----- ----- ----- ----- ----- ----- 0.13
170 0.00 325.15 0.16 0.13 ----- ----- ----- ----- ----- ----- ----- 0.13
171 0.00 325.15 0.16 0.12 ----- ----- ----- ----- ----- ----- ----- 0.12
172 0.00 325.15 0.16 0.12 ----- ----- ----- ----- ----- ----- ----- 0.12
173 0.00 325.15 0.16 0.12 ----- ----- ----- ----- ----- ----- ----- 0.12
174 0.00 325.14 0.16 0.12 ----- ----- ----- ----- ----- ----- ----- 0.12
175 0.00 325.14 0.15 0.11 ----- ----- ----- ----- ----- ----- ----- 0.11
176 0.00 325.14 0.15 0.11 ----- ----- ----- ----- ----- ----- ----- 0.11
177 0.00 325.14 0.15 0.11 ----- ----- ----- ----- ----- ----- ----- 0.11
178 0.00 325.14 0.15 0.11 ----- ----- ----- ----- ----- ----- ----- 0.11
179 0.00 325.14 0.15 0.10 ----- ----- ----- ----- ----- ----- ----- 0.10
180 0.00 325.13 0.15 0.10 ----- ----- ----- ----- ----- ----- ----- 0.10
181 0.00 325.13 0.15 0.10 ----- ----- ----- ----- ----- ----- ----- 0.10
182 0.00 325.13 0.15 0.10 ----- ----- ----- ----- ----- ----- ----- 0.10
183 0.00 325.13 0.14 0.09 ----- ----- ----- ----- ----- ----- ----- 0.09
184 0.00 325.13 0.14 0.09 ----- ----- ----- ----- ----- ----- ----- 0.09
185 0.00 325.13 0.14 0.09 ----- ----- ----- ----- ----- ----- ----- 0.09
186 0.00 325.13 0.14 0.09 ----- ----- ----- ----- ----- ----- ----- 0.09
187 0.00 325.12 0.14 0.09 ----- ----- ----- ----- ----- ----- ----- 0.09
188 0.00 325.12 0.14 0.08 ----- ----- ----- ----- ----- ----- ----- 0.08
189 0.00 325.12 0.14 0.08 ----- ----- ----- ----- ----- ----- ----- 0.08
190 0.00 325.12 0.14 0.08 ----- ----- ----- ----- ----- ----- ----- 0.08
191 0.00 325.12 0.14 0.08 ----- ----- ----- ----- ----- ----- ----- 0.08
192 0.00 325.12 0.14 0.08 ----- ----- ----- ----- ----- ----- ----- 0.08
193 0.00 325.12 0.13 0.08 ----- ----- ----- ----- ----- ----- ----- 0.08
194 0.00 325.12 0.13 0.07 ----- ----- ----- ----- ----- ----- ----- 0.07
195 0.00 325.11 0.13 0.07 ----- ----- ----- ----- ----- ----- ----- 0.07
196 0.00 325.11 0.13 0.07 ----- ----- ----- ----- ----- ----- ----- 0.07
Continues on next page...
TT&E - POND 1
Hydrograph Discharge Table
Time Inflow Elevation Clv A Clv B Clv C Clv D Wr A Wr B Wr C Wr D Exfil Outflow
(min) cfs ft cfs cfs cfs cfs cfs cfs cfs cfs cfs cfs
197 0.00 325.11 0.13 0.07 ----- ----- ----- ----- ----- ----- ----- 0.07
198 0.00 325.11 0.13 0.07 ----- ----- ----- ----- ----- ----- ----- 0.07
199 0.00 325.11 0.13 0.07 ----- ----- ----- ----- ----- ----- ----- 0.07
200 0.00 325.11 0.13 0.06 ----- ----- ----- ----- ----- ----- ----- 0.06
201 0.00 325.11 0.13 0.06 ----- ----- ----- ----- ----- ----- ----- 0.06
202 0.00 325.11 0.13 0.06 ----- ----- ----- ----- ----- ----- ----- 0.06
203 0.00 325.11 0.13 0.06 ----- ----- ----- ----- ----- ----- ----- 0.06
204 0.00 325.11 0.13 0.06 ----- ----- ----- ----- ----- ----- ----- 0.06
205 0.00 325.10 0.12 0.06 ----- ----- ----- ----- ----- ----- ----- 0.06
206 0.00 325.10 0.12 0.06 ----- ----- ----- ----- ----- ----- ----- 0.06
207 0.00 325.10 0.12 0.06 ----- ----- ----- ----- ----- ----- ----- 0.06
208 0.00 325.10 0.12 0.05 ----- ----- ----- ----- ----- ----- ----- 0.05
209 0.00 325.10 0.12 0.05 ----- ----- ----- ----- ----- ----- ----- 0.05
210 0.00 325.10 0.12 0.05 ----- ----- ----- ----- ----- ----- ----- 0.05
211 0.00 325.10 0.12 0.05 ----- ----- ?„ ----- ----- ----- ----- ----- 0.05
212 0.00 325.10 0.12 0.05 ----- ----- ----- ----- ----- ----- ----- 0.05
213 0.00 325.10 0.12 0.05 ----- ----- ----- ----- ----- ----- ----- 0.05
214 0.00 325.10 0.12 0.05 ----- ----- ----- ----- ----- ----- ----- 0.05
215 0.00 325.10 0.12 0.05 ----- ----- ----- ----- ----- ----- ----- 0.05
216 0.00 325.10 0.12 0.05 ----- ----- ----- ----- ----- ----- ----- 0.05
217 0.00 325.09 0.12 0.05 ----- ----- ----- ----- ----- ----- ----- 0.05
218 0.00 325.09 0.11 0.05 ----- ----- ----- ----- ----- ----- ----- 0.05
219 0.00 325.09 0.11 0.05 ----- ----- ----- ----- ----- ----- ----- 0.05
220 0.00 325.09 0.11 0.05 ----- ----- ----- ----- ----- ----- ----- 0.05
221 0.00 325.09 0.11 0.05 ----- ----- ----- ----- ----- ----- ----- 0.05
222 0.00 325.09 0.11 0.05 ----- ----- ----- ----- ----- ----- ----- n n;
6
End
odh American Green - ECMDS Version 4.3 71012008 357PM. OMPUTED BY: MWC
PROJECT NAME: .TTE]RON METAL PROJECT NO.: POND #1 OUTLET
FROM STATIONMEACH: TO STATION/REACH: DRAINAGE AREA: ESIGN FREQUENCY:
HYDRAULIC RESULTS
Dischage Peak Flow Velocdy (Ips) Plea(sq.ft) Hydraulic Namal Rock Riprap(n-0.030)
1 l II Depth
Period hrs I
4.7 fl
4.7 0.1 1.85 2.53 0.23 0.33
S = 0.0100
1 g 1
170 'Widt?ilto?50 it 40
LINER RESULTS
Not to Scale

Reach Matting Type
Stability Analysis Vegetation Characteristics
Permissible
Calculated
Safety Factor
Remarks
Staple Pattern Phase Class Type Density Shear Sitters
(psf) Shear Stress
1p-f)
Straight Hock Riprap Unvegetated 2.00 0.20 9.82 STABLE
Bin
C Back td Input Screen
a
DRAINAGE AREA 43
(LEVEL SPREADER #1)
DESIGN CALCULATIONS
TT&E IRON & METAL
GARNER, NORTH CAROLINA
SUBMITTED BY: DEVELOPMENT CONSULTING SERVICES, INC.
1401 AVERSBORO ROAD, SUITE 206
GARNER, NC 27529
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STORMWATER MANAGEMENT PERMIT APPLICATION FORM
401 CERTIFICATION APPLICATION FORM
LEVEL SPREADER, FILTER STRIP AND RESTORED RIPARIAN BUFFER SUPPLEMENT
This form must be completely filled out, printed and submitted.
DO NOT FORGET TO ATTACH THE REQUIRED ITEMS CHECKLIST AND ALL REQUIRED ITEMS (NEXT WORKSHEET)!
!,;PROJECT INFORMATION
Project name TT&E Iron & Metal
Contact name Development Consulting Services, Inc. (Matt Collins
Phone number 919-329-0051
Date July 28, 2008
Drainage area number
3 (LEVEL SPREADER #1
I? I. DESIGN INFORMATION
For Level Spreaders Receiving Flow From a BMP
Type of BMP
Drawdown flow from the BMP cfs
For Level Spreaders Receiving Flow from the Drainage Area
Drainage area 11,740.00 fe
Impervious surface area 6,041.00 ft2
Percent impervious 51.46 %
Rational C coefficient 0.63
Peak flow from the 1 in/hr storm 0.17 cfs
Time of concentration 15.00 min
Rainfall intensity, 1 0-yr storm 7.22 in/hr
Peak flow from the 10-yr storm 1.23 cfs
Where Does the Level Spreader Discharge ?
To a grassed bioretention cell? N (Y or N)
To a mulched bioretention cell? N (Y or N)
To a wetland? N (Y or N)
To a filter strip or riparian buffer? Y (Y or N) Please complete filter strip characterization below.
Other (specify)
Filter Strip or Riparian Buffer Characterization (if applicable)
Width of grass 0.00 ft
Width of dense ground cover 0.00 ft
Width of wooded vegetation 50.00 ft
Total width 50.00 ft
Elevation at downslope base of level lip 320.00 fmsl
Elevation at top of bank of the receiving water 318.00 fmsl
Slope (from level lip to to top of bank) 4.00 % OK
Are any draws present? N (Y or N) OK
Level Spreader Design
Forebay surface area 25.00 sq ft OK
Feet of level lip needed per cfs 65 ft/cfs
Answer "Y" to one of the following:
Length based on the 1 in/hr storm? N (Y or N)
Length based on the 10-yr storm? Y (Y or N)
Length based on the BMP discharge rate? N (Y or N)
Design flow 3.27 cfs There is too much flow to be handled by a level spreader.
Is a bypass device provided? N (Y or N) A bypass device is not needed.
Form SW401-Level Spreader, Filter Strip, Restored Riparian Buffer-Rev.5 Parts I. and II. Design Summary, page 1 of 2
Length of the level lip
Are level spreaders in series?
Bypass Channel Design (if applicable)
Does the bypass discharge through a wetland?
Does the channel enter the stream at an angle?
Dimensions of the channel (see diagram below):
M
B
W
y
Peak velocity in the channel during the 10-yr storm
Channel lining material
cfS Do not complete this section of the worksheet
Do riot complete this section of the worksheet
? W
I Y I
i---- -------- i
M M
i B i
80.00 ft Level spreader length OK.
N (Y or N)
(Y or N) Do not complete this section of the worksheet.
(Y or N) Do riot complete this section of the worksheet.
Do riot complete this section of the worksheet.
ft Do riot complete this section of the worksheet.
ft Do not complete this section of the worksheet.
ft Do riot complete this section of the worksheet.
ft Do not complete this section of the worksheet.
Form SW401-Level Spreader, Filter Strip, Restored Riparian Buffer-Rev.5 Parts I. and ll. Design Summary, page 2 of 2
III. REQUIRED ITEMS CHECKLIST
Please indicate the page or plan sheet numbers where the supporting documentation can be found. An incomplete submittal package will
result in a request for additional information. This will delay final review and approval of the project. Initial in the space provided to
indicate the following design requirements have been met. If the applicant has designated an agent, the agent may initial below. If a
requirement has not been met, attach justification.
Page/ Plan
In' ials Sheet No.
C Z 1. Plans (1" 50' or larger) of the entire site showing:
Design at ultimate build-out,
Off-site drainage (if applicable),
G-y Delineated drainage basins (include Rational C coefficient per basin),
Forebay (if applicable),
High flow bypass system,
Maintenance access,
Proposed drainage easement and public right of way (ROW), and
Boundaries of drainage easement.
2. Plan details (1" = 30' or larger) for the level spreader showing:
Forebay (if applicable),
High flow bypass system,
One foot topo lines between the level lip and top of stream bank,
Proposed drainage easement, and
Design at ultimate build-out.
3. Section view of the level spreader (1" = 20' or larger) showing:
Underdrain system (if applicable),
Level lip,
Upslope channel, and
Downslope filter fabric.
4. A date-stamped photograph of the filter strip that clearly shows the type of vegetation that is present.
5. A construction sequence that shows how the level spreader will be protected from sediment until the entire
drainage area is stabilized.
A?A'lC 7 ' 6. The supporting calculations.
NIWG
7. A copy of the signed and notarized operation and maintenance (0&M) agreement.
lJL 8. A copy of the deed restrictions (if required).
?.-???ubE? jJ1T1?( '?'A?'`V1a/S SvaM rTTidt-
Form SW401-Level Spreader, Filter Strip, Restored Riparian Buffer-Rev.5 Part III, page 1 of 1
TT&E IRON & METAL
LEVEL SPREADER #1 - DRAINAGE AREA CALCUALTIONS
DRAINAGE AREA: 0.27 AC
EXIST. IMP AREA: 0.00 AC 0.0%
PROP. IMP. AREA: 0.14 AC 51.1%
RUNOFF COEFFICIENT (C)
Cpre= 0.27 AC x 0.25 + 0.00 AC x 1.0 =
0.25
0.27 AC .
Cpost= 0.13 AC x 0.25 + 0.14 AC x 1.0 =
0.63
0.27 AC .

10 YEAR STORM
Qpre=CIA= 0.25 x 7.22 x 0.27 = 0.49 cfs
Qpost=CIA= 0.63 x 7.22 x 0.27 = 1.23 cfs
STORM DATA
STORM EVENT INTENSITY
(I)
PRECIPITATION
DEPTH (P )
10 YEAR 7.22 in/hr 3.9"

DETERMINE SOIL STORAGE
CN= 98 x 0.31 + 55 x 0.59 + 61 x 0.10 = 69
S= 100 -10 = 68 90 -10 = 4.51
RUNOFF DEPTH * _ (P-0.2 *S)2
(Q*) Q - (P+0.8*S)
Q* x DA x 43560 SF/AC
TIME TO PEAK (Tp) Tp= 12 in/ft
1.39 x Qpost
10 YEAR STORM
Q* _ (3.9 - 0.2 x 4.5 )^2 = 1.20 in.
(3.9 + 0.8 x 4.51)
1.20 in.
x 0.27 AC x 43560 SF/AC
Tp= ^„ ,_,« = 11.4 min.
1.39 x 1.23 cfs
po. PEAK 1.23 cfs @ 11.4 min.
L--
4
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