20110749 Ver 1_More Info Received_20110822

ENVIRONMENTAL SERVICES, INC.
524 South New Hope Road
Raleigh, North Carolina 27610
919-212-1760 / Facsimile 919-212-1707
www.environmentalservices.com
MEMORANDUM
k?- 0? +?
TO: Annette Lucas
FROM: Robert Turnbull
DATE: August 22, 2011
RE: Flowers Plantation - Dogwood Property Stormwater Information
On August 12, 2011, Environmental Services, Inc., on behalf of M/I Homes, submitted a Pre-
Construction Notification form for Neuse River Riparian Buffer impacts associated with the
Dogwood Property at Flowers Plantation in Johnston County, North Carolina. The attached
plans include further information regarding the stormwater plans for the development and are
meant as a supplement to the August 12, 2011 submittal.
Please call me if you have any questions or need any further information. Thank you for your
assistance with this project.
Permit Number:
(to be provided by DWQ)
Drainage Area Number:
Filter Strip, Restored Riparian Buffer and Level Spreader
Operation and Maintenance Agreement
I will keep a maintenance record on this BMP. This maintenance record will be kept in a
log in a known set location. Any deficient BMP elements noted in the inspection will be
corrected, repaired or replaced immediately. These deficiencies can affect the integrity
of structures, safety of the public, and the removal efficiency of the BMP.
Important maintenance procedures:
- Immediately after the filter strip is established, any newly planted vegetation
will be watered twice weekly if needed until the plants become established
(commonly six weeks).
- Once a year, the filter strip will be reseeded to maintain a dense growth of
vegetation
- Stable groundcover will be maintained in the drainage area to reduce the
sediment load to the vegetation.
- Two to three times a year, grass filter strips will be mowed and the clippings
harvested to promote the growth of thick vegetation with optimum pollutant
removal efficiency. Turf grass should not be cut shorter than 3 to 5 inches and
may be allowed to grow as tall as 12 inches depending on aesthetic requirements
(NIPC,1993). Forested filter strips do not require this type of maintenance.
- Once a year, the soil will be aerated if necessary.
- Once a year, soil pH will be tested and lime will be added if necessary.
After the filter strip is established, it will be inspected quarterly and within 24 hours
after every storm event greater than 1.0 inch (or 1.5 inches if in a Coastal County).
Records of operation and maintenance will be kept in a known set location and will be
available upon request.
Inspection activities shall be performed as follows. Any problems that are found shall
be repaired immediately.
BMP element: Potential problem: How I will remediate the problem:
The entire filter strip Trash/debris is present. Remove the trash/ debris.
system
The flow splitter device The flow splitter device is Unclog the conveyance and dispose
(if applicable) clogged. of an sediment off-site.
The flow splitter device is Make any necessary repairs or
damaged. replace if damage is too large for
re air.
Form SWU401-Level Spreader, Filter Strip, Restored Riparian Buffer O&M-Rev.' Page 1 of 3
BMP element: Potential problem: How I will remediate the problem:
The swale and the level The swale is clogged with Remove the sediment and dispose
lip sediment. of it off-site.
The level lip is cracked, Repair or replace lip.
settled, undercut, eroded or
otherwise damaged.
There is erosion around the Regrade the soil to create a berm
end of the level spreader that that is higher than the level lip, and
shows stormwater has then plant a ground cover and
bypassed it. water until it is established. Provide
lime and a one-time fertilizer
application.
Trees or shrubs have begun Remove them.
to grow on the swale or just
downslo e of the level lip.
The bypass channel Areas of bare soil and/or Regrade the soil if necessary to
erosive gullies have formed. remove the gully, and then
reestablish ro er erosion control.
Turf reinforcement is Study the site to see if a larger
damaged or ripap is rolling bypass channel is needed (enlarge if
downhill. necessary). After this, reestablish
the erosion control material.
The filter strip Grass is too short or too long Maintain grass at a height of
(if applicable). approximately three to six inches.
Areas of bare soil and/or Regrade the soil if necessary to
erosive gullies have formed. remove the gully, and then plant a
ground cover and water until it is
established. Provide lime and a
one-time fertilizer application.
Sediment is building up on Remove the sediment and
the filter strip. restabilize the soil with vegetation if
necessary. Provide lime and a one-
time fertilizer application.
Plants are desiccated. Provide additional irrigation and
fertilizer as needed.
Plants are dead, diseased or Determine the source of the
dying. problem: soils, hydrology, disease,
etc. Remedy the problem and
replace plants. Provide a one-time
fertilizer application.
Nuisance vegetation is Remove vegetation by hand if
choking out desirable species. possible. If pesticide is used, do not
allow it to get into the receiving
water.
The receiving water Erosion or other signs of Contact the NC Division of Water
damage have occurred at the Quality local Regional Office, or the
outlet. 401 Oversight Unit at 919-733-1786.
Form SWU401-Level Spreader, Filter Strip, Restored Riparian Buffer O&M-Rev.3 Page 2 of 3
Permit Number:
(to be provided by DWQ)
I acknowledge and agree by my signature below that I am responsible for the
performance of the maintenance procedures listed above. I agree to notify DWQ of any
problems with the system or prior to any changes to the system or responsible party.
Project name:Flowers Plantation Dogwood
BMP drainage area number:Level Spreaders 1-4
Print name:Jeremy Medlin, M/I Homes of Raleigh
Title:Vice President of Land Development
Address: 1511 Sunday Drive, Suite 100
Phone: [phone]
Signature:
Date:
Note: The legally responsible party should not be a homeowners association unless more than 50% of
the lots have been sold and a resident of the subdivision has been named the president.
I, , a Notary Public for the State of
County of , do hereby certify that
personally appeared before me this
day of , and acknowledge the due execution of the
forgoing filter strip, riparian buffer, and/or level spreader maintenance requirements.
Witness my hand and official seal,
SEAL
My commission expires
Form SWU401-Level Spreader, Filter Strip, Restored Riparian Buffer O&M-Rev.3 Page 3 of 3
Flowers Plantation
Dogwood
Owner/Developer:
M/1 Homes
1511 Sunday Drive, Suite 100
Raleigh, NC 27607
Owner Contact: Mr. Jeremy Medlin
Vice President of Land Development
STOCKS ENGINEERING,
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1100 Eastern avenue Phone: [phone]
PO Box 1108 Fax: [phone]
Nashville, NC 27856 Mobile: [phone]
Email: [e-mail]
Stocks Engineering, P.A.
1100 Eastern Avenue
PO Box 1108
Nashville, NC 27856
Project: Dogwood
Date: June 2, 2011
Page: 1 of 1
Post-Development
Tc Area ID Area (Ac.) C 1-1 inch 'Q-1">(cfs)

5 la 0.14 0.41 1 0.06
5 lb 0.08 0.65 1 0.05
5 IC 1.04 0.56 1 0.58
5 Id 0.55 0.54 1 0.30
5 le 0.05 0.95 1 0.05
5 If 0.37 0.62 1 0.23
5 I 0.71 0.61 1 0.43
5 Ih 0.55 0.49 1 0.27

5 Ila 0.34 0.65 1 0.22
5 Ilb 0.26 0.67 1 0.17
5 IIC 0.33 0.68 1 0.22

5 Ilia 0.85 0.67 1 0.57
5 Illb 0.09 0.93 1 0.08
5 IIIC 0.14 0.65 1 0.09
5 Illd 0.45 0.70 1 0.32
5 Ille 0.08 0.35 1 0.03

5 Na 0.16 0.73 1 0.12
5 IVb 0.45 0.68 1 0.31
5 IVC 2.00 0.65 1 1.30
5 IVd 0.03 0.95 1 0.03
5 IVe 0.74 0.41 1 0.30
5 IVf 0.10 0.95 1 0.10
5 IV 0.36 0.75 1 0.27
5 IVh 0.65 0.55 1 0.36
5 IVi 0.10 0.55 1 0.06
5 IV' 0.95 0.53 1 0.50
5 IVk 0.10 0.63 1 0.06
5 IVI 0.33 0.47 1 0.16
5 IVm 0.03 0.95 1 0.03
5 IVn 0.42 0.69 1 0.29
5 NO 0.04 0.35 1 0.01

5 Va 0.41 0.51 1 0.21

- Total 12.90 - 1.00 7.77

Runoff Computations
1-Inch Storm
Stocks Engineering, P.A.
1100 Eastern Avenue
PO Box 1108
Nashville, NC 27856
Post-Development
Tc Area ID Area (Ac.) C 12 Q2 (cfs)

5 la 0.14 0.41 5.76 0.33
5 lb 0.08 0.65 5.76 0.30
5 Ic 1.04 0.56 5.76 3.35
5 Id 0.55 0.54 5.76 1.71
5 le 0.05 0.95 5.76 0.27
5 If 0.37 0.62 5.76 1.32
5 I 0.71 0.61 5.76 2.49
5 Ih 0.55 0.49 5.76 1.55

5 Ila 0.34 0.65 5.76 1.27
5 Ilb 0.26 0.67 5.76 1.00
5 llc 0.33 0.68 5.76 1.29

5 Ilia 0.85 0.67 5.76 3.28
5 Illb 0.09 0.93 5.76 0.48
5 Illc 0.14 0.65 5.76 0.52
5 Illd 0.45 0.70 5.76 1.81
5 Me 0.08 0.35 5.76 0.16

5 IVa 0.16 0.73 5.76 0.67
5 IVb 0.45 0.68 5.76 1.76
5 IVc 2.00 0.65 5.76 7.49
5 IVd 0.03 0.95 5.76 0.16
5 IVe 0.74 0.41 5.76 1.75
5 IVf 0.10 0.95 5.76 0.55
5 IVg 0.36 0.75 5.76 1.56
5 IVh 0.65 0.55 5.76 2.06
5 IVi 0.10 0.55 5.76 0.32
5 IV' 0.95 0.53 5.76 2.90
5 IVk 0.10 0.63 5.76 0.36
5 IVI 0.33 0.47 5.76 0.89
5 IVm 0.03 0.95 5.76 0.16
5 IVn 0.42 0.69 5.76 1.67
5 IVo 0.04 0.35 5.76 0.08

5 Va 0.41 0.51 5.76 1.20

- Total 12.90 - 5.76 44.76

Runoff Computations
2-Year Storm
Stocks Engineering, P.A.
1100 Eastern Avenue
PO Box 1108
Nashville, NC 27856
Post-Development
Tc Area ID Area (Ac.) C 110 Q10 (cfs)'

5 la 0.14 0.41 7.38 0.42
5 Ib 0.08 0.65 7.38 0.38
5 Ic 1.04 0.56 7.38 4.30
5 Id 0.55 0.54 7.38 2.19
5 le 0.05 0.95 7.38 0.35
5 If 0.37 0.62 7.38 1.69
5 I 0.71 0.61 7.38 3.20
5 Ih 0.55 0.49 7.38 1.99

5 Ila 0.34 0.65 7.38 1.63
5 Ilb 0.26 0.67 7.38 1.29
5 Ilc 0.33 0.68 7.38 1.66

5 IIla 0.85 0.67 7.38 4.20
5 Illb 0.09 0.93 7.38 0.62
5 Ills 0.14 0.65 7.38 0.67
5 IIId 0.45 0.70 7.38 2.32
5 Ille 0.08 0.35 7.38 0.21

5 Na 0.16 0.73 7.38 0.86
5 IVb 0.45 0.68 7.38 2.26
5 IVc 2.00 0.65 7.38 9.59
5 IVd 0.03 0.95 7.38 0.21
5 We 0.74 0.41 7.38 2.24
5 IVf 0.10 0.95 7.38 0.70
5 IVg 0.36 0.75 7.38 1.99
5 IVh 0.65 0.55 7.38 2.64
5 IVi 0.10 0.55 7.38 0.41
5 IV' 0.95 0.53 7.38 3.72
5 IVk 0.10 0.63 7.38 0.46
5 IVI 0.33 0.47 7.38 1.14
5 IVm 0.03 0.95 7.38 0.21
5 IVn 0.42 0.69 7.38 2.14
5 IVo 0.04 0.35 7.38 0.10

5 Va 0.41 0.51 7.38 1.54

- Total 12.90 - 7.38 57.34

Runoff Computations
10-Year Storm
Stocks Engineering, P.A.
1100 Eastern Avenue
PO Box 1108
Nashville, NC 27856
Post-Development
Te Area ID Area (Ac.) C 125 Q25 (efs)

5 la 0.14 0.41 8.21 0.47
5 Ib 0.08 0.65 8.21 0.43
5 Ic 1.04 0.56 8.21 4.78
5 Id 0.55 0.54 8.21 2.44
5 le 0.05 0.95 8.21 0.39
5 If 0.37 0.62 8.21 1.88
5 I 0.71 0.61 8.21 3.56
5 Ih 0.55 0.49 8.21 2.21

5 Ila 0.34 0.65 8.21 1.81
5 Ilb 0.26 0.67 8.21 1.43
5 IIC 0.33 0.68 8.21 1.84

5 IIIa 0.85 0.67 8.21 4.68
5 Illb 0.09 0.93 8.21 0.69
5 IIIC 0.14 0.65 8.21 0.75
5 Illd 0.45 0.70 8.21 2.59
5 Me 0.08 0.35 8.21 0.23

5 Na 0.16 0.73 8.21 0.96
5 IVb 0.45 0.68 8.21 2.51
5 IVC 2.00 0.65 8.21 10.67
5 IVd 0.03 0.95 8.21 0.23
5 IVe 0.74 0.41 8.21 2.49
5 IVf 0.10 0.95 8.21 0.78
5 IVg 0.36 0.75 8.21 2.22
5 IVh 0.65 0.55 8.21 2.94
5 IVi 0.10 0.55 8.21 0.45
5 IV' 0.95 0.53 8.21 4.13
5 IVk 0.10 0.63 8.21 0.52
5 IVI 0.33 0.47 8.21 1.27
5 IVm 0.03 0.95 8.21 0.23
5 IVn 0.42 0.69 8.21 2.38
5 No 0.04 0.35 8.21 0.11

5 Va 0.41 0.51 8.21 1.72

- Total 12.90 - 8.21 63.79

Runoff Computations
25-Year Storm
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Storm Sewer Summary Report
Page 1
Line Line ID Flow Line Line Invert Invert Line HGL HGL Minor HGL Dns
No. rate size length EL Dn EL Up slope down up loss Junct line
(cfs) (in) (ft) (ft) (ft) N (ft) (ft) (ft) (ft) No.
1 FES1 TO JB2 22.30 34 c 78.0 260.00 268.53 10.936 261.53 270.06 n/a 270.99 i End
2 JB2 TO CB4 22.30 30 c 24.0 268.63 268.70 0.292 270.99 271.05 0.17 271.22 1
3 CB4 TO CB5 20.63 30 c 99.0 268.80 269.10 0.303 271.22 271.43 0.17 271.60 2
4 CB5 TO CB6 20.47 30 c 150.0 269.20 269.65 0.300 271.60 271.91 0.48 272.38 3
5 CB6 TO C67 0.89 15 c 20.0 269.75 270.15 2.000 272.67* 272.68* 0.01 272.69 4
6 CB6 TO CB8 19.22 30 c 94.0 269.75 270.03 0.298 272.44* 272.65* 0.36 273.01 4
7 CB8 TO D19 2.38 15 c 120.0 270.13 270.49 0.300 273.19* 273.35* 0.09 273.44 6
8 C138 TO CB11 13.94 24 c 93.0 270.13 274.78 5.000 273.01 276.10 n/a 277.06 i 6
9 D19 TO DI10 2.06 15 c 64.0 270.54 270.73 0.297 273.45* 273.52* 0.04 273.56 7
10 CB11 TO CB12 12.38 18 c 99.0 274.88 281.32 6.505 277.06 282.65 n/a 284.24 i 8
11 CB12TO CB13 11.83 18 c 56.0 281.42 285.34 7.000 284.24 286.65 n/a 288.11 i 10
12 CB13 TO CB14 2.43 15 c 38.0 285.44 285.82 1.000 288.11* 288.16* 0.07 288.23 11
13 CB14 TO CB15 0.67 15 c 20.0 285.92 286.12 1.000 288.28* 288.29* 0.00 288.29 12
14 CB13 TO CB16 7.65 18 c 80.0 285.44 290.24 6.000 288.11 291.30 n/a 292.11 i 11
15 CB16 TO FES17 7.49 18 c 62.0 290.34 297.78 12.000 292.11 298.82 n/a 299.62 i 14
Project File: SD.stm Number of lines: 15 Run Date: 06 29 2011
NOTES: c = cir; e = ellip; b = box; Return period = 10 Yrs. ; *Surcharged (HGL above crown). ; i - Inlet control.
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Storm Sewer Summary Report
Page 1
Line Line ID Flow Line Line Invert Invert Line HGL HGL Minor HGL Dns
No. rate size length EL On EL Up slope down up loss Junct line
(cfs) (in) (ft) (ft) (ft) (%) (ft) (ft) (ft) (ft) No.
1 CB19 to FES18 6.09 18 c 78.0 271.00 280.52 12.205 271.94 281.46 n/a 282.09 i End
2 CB20 to CB19 4.28 18 c 28.0 280.60 282.56 7.000 282.09 283.35 n/a 283.79 i 1
3 CB21 to CB20 3.76 18 c 182.0 282.66 291.45 4.830 283.79 292.19 n/a 292.58 i 2
4 CB22 to CB21 3.28 18 c 90.0 291.55 292.90 1.500 292.58 293.59 n/a 293.93 i 3
Pipes 18 to 22 Number of lines: 4 Run Date: 06-29-2011
NOTES: c = cir; e = ellip; b = box; Return period = 2 Yrs. ; i - Inlet control.
Hydraflow Storm Sewers 2005
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Storm Sewer Summary Report
Page 1
Line Line ID Flow Line Line Invert Invert Line HGL HGL Minor HGL Dns
No. rate size length EL Dn EL Up slope down up loss Junct line
(cfs) (in) (ft) (ft) (ft) (%) (ft) (ft) (ft) (ft) No.
1 J824 to FES23 13.43 22 c 62.0 279.00 284.00 8.065 280.33 285.33 n/a 286.44 i End
2 JB25 to JB24 13.43 24 c 17.0 284.05 284.10 0.294 286.44* 286.50* 0.28 286.75 1
3 CB25A to JB25 3.66 24 c 107.0 284.15 284.47 0.299 287.05* 287.07* 0.02 287.09 2
4 CB26 to CB25A 2.37 24 c 32.0 284.52 286.36 5.750 287.10 287.04 0.05 287.09 3
5 CB27 to CB26 1.37 18 c 144.0 286.46 296.27 6.812 287.18 296.72 n/a 296.88 i 4
6 CB28 to CB27 1.27 18 c 60.0 296.34 297.84 2.500 296.88 298.27 n/a 298.43 i 5
7 CB29 to JB25 9.77 24 c 153.0 284.15 290.67 4.261 286.92 291.78 n/a 292.44 i 2
8 CB30 to CB29 2.49 18 c 46.0 290.75 290.98 0.500 292.44 292.46 0.03 292.49 7
9 CB31 to CB29 5.96 18 c 145.0 290.75 296.35 3.862 292.44 297.28 n/a 297.90 i 7
10 CB32 to CB31 1.71 18 c 22.0 296.45 296.67 1.000 297.90 297.90 0.02 297.92 9
11 CB33 to CB31 3.98 18 c 62.0 296.45 297.05 0.968 297.90 297.90 n/a 298.07 i 9
12 D134 to CB33 0.63 15 c 31.0 297.15 298.70 5.000 298.07 299.02 n/a 299.13 i 11
13 D135 to DI34 0.33 15 c 90.0 298.80 300.60 2.000 299.13 300.83 n/a 300.90 i 12
Pipes 23 to 36 Number of lines: 13 Run Date: 06-29-2011
NOTES: c = cir; e = ellip; b = box; Return period = 2 Yrs. ; *Surcharged (HGL above crown). ; i - Inlet control.
HydraFlow Storm Sewers 2005
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G? '??? A rF
NCDENR
STORMWATER MANAGEMENT PERMIT APPLICATION FORM
401 CERTIFICATION APPLICATION FORM
LEVEL SPREADER - VEGETATED FILTER STRIP (LS-VFS) SUPPLEMENT
This form must be completely filled out, printed, initialed, and submitted.
L PROJECT INFORMATION
Project name
Contact name
Phone number
Date
Drainage area number Dogwood
Kevin Varnell
252.459.8196
June 20, 2011
1
111. DESIGN INFORMATION`
The purpose of the LS-VFS Buffer Rule: Diffus e Flow
Stormwater enters LS-VFS from The drainage area
Type of VFS Engineered filter strip (graded & sodded, slope < 8%)
Explanation of any "Other" responses above
If Stormwater Enters the LS-VFS from the Drainage Area
Drainage area 17,860 ft2
Impervious surface area 4,792 ft2
Percent impervious 26.83 %
Rational C coefficient 0.51
Peak flow from the 1 in/hr storm 0.21 cfs
Time of concentration 5.00 min
Rainfall intensity, 10-yr storm 7.38 in/hr
Peak flow from the 10-yr storm 1.54 cfs
Design storm 10-year storm
Maximum amount of flow directed to the LS-VFS 1.54 cfs
Is a flow bypass system going to be used? N (Y or N)
Explanation of any "Other" responses above
If Stormwater Enters the LS-VFS from a BMP
Type of BMP
Peak discharge from the BMP during the design storm
Peak discharge from the BMP during the 10-year storm
Maximum capacity of a 100-foot long LS-VFS
Peak flow directed to the LS-VFS
Is a flow bypass system going to be used?
Explanation of any "Other" responses above
LS-VFS Design
Forebay surface area
Depth of forebay at stormwater entry point
Depth of forebay at stormwater exit point
Feet of level lip needed per cfs
Computed minimum length of the level lip needed
Length of level lip provided
Pick one:
Do not complete this section of the form.
cfs
cfs Do not complete this section of the form.
10 cfs
cfs Do not complete this section of the form.
(Y or N)
10
18
6
10
15
1R
sq ft
in
in
ft/cfs
ft
ft
Forebay is adequately sized.
Depth is appropriate.
Depth is appropriate.
Form SW401 - LS-VFS - 29Nov2010 - Rev.8 page 1 of 3
Width of VFS 30 ft
Elevation at downslope base of level lip 260.40 fmsl
Elevation at the end of the VFS that is farthest from the LS 258.00 fmsl
Slope (from level lip to the end of the VFS) 8.00 %
Are any draws present in the VFS? N (Y or N)
Is there a collector swale at the end of the VFS? N (Y or N)
Bypass System Design (if applicable)
Is a bypass system provided? (Y or N)
Is there an engineered flow splitting device? (Y or N)
Dimensions of the channel (see diagram below):
M ft
B ft
W ft
y (flow depth for 10-year storm) ft
freeboard (during the 10-year storm) ft
Peak velocity in the channel during the 10-yr storm fUsec
Channel lining material Pick one:
Does the bypass discharge through a wetland? (Y or N)
Does the channel enter the stream at an angle? (Y or N)
Explanation of any "Other" responses above
OK
W
1 B 1
III. REQUIRED ITEMS CHECKLIST
EDIT 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.
Requried Item:
1. Plans (1" - 50' or larger) of the entire site showing:
- Design at ultimate build-out,
Off-site drainage (if applicable),
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.
Initials Page or plan sheet number and any notes:
f C-1,D-2
i
Form SW401 - LS-VFS - 29Nov2010 - Rev.8 page 2 of 3
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. Plan details of the flow splitting device and supporting calculations (if applicable).
5. A construction sequence that shows how the level spreader will be protected from
sediment until the entire drainage area is stabilized.
6. If a non-engineered VFS is being used, then provide a photograph of the VFS showing
that no draws are present.
7. The supporting calculations.
8. A copy of the signed and notarized operation and maintenance (0&M) agreement.
Form SW401 - LS-VFS - 29Nov2010 - Rev.8 page 3 of 3
Aiii';IAA
NCDENR
STORMWATER MANAGEMENT PERMIT APPLICATION FORM
401 CERTIFICATION APPLICATION FORM
LEVEL SPREADER - VEGETATED FILTER STRIP (LS-VFS) SUPPLEMENT
This form must be completely filled out, printed, initialed, and submitted.
o?, \N' A 7'£R
D.Q
L PROJECT INFORMATION
Project name Dogwood
Contact name Kevin Varnell
Phone number 252.459.8196
Date June 20, 2011
Drainage area number 2
IL DESIGN INFORMATION
The purpose of the LS-VFS Buffer Rule: Diffuse Flow
Stormwater enters LS-VFS from The drainage area
Type of VFS Engineered filter strip (graded & sodded, slope < 8%)
Explanation of any "Other" responses above
If Stormwater Enters the LS-VFS from the Drainage Area
Drainage area 281,398 ftz
Impervious surface area 128,502 ftz
Percent impervious 45.67 %
Rational C coefficient 0.60
Peak flow from the 1 in/hr storm 189 cfs
Time of concentration 5.00 min
Rainfall intensity, 1 0-yr storm 7.38 in/hr
Peak flow from the 10-yr storm 28.68 cfs
Design storm 1 inch/hour storm
Maximum amount of flow directed to the LS-VFS 3.89 cfs
Is a flow bypass system going to be used? Y (Y or N)
Explanation of any "Other" responses above
If Stormwater Enters the LS-VFS from a BMP Do not complete this section of the form.
Type of BMP Pick one:
Peak discharge from the BMP during the design storm cfs
Peak discharge from the BMP during the 10-year storm cfs Do not complete this section of the form.
Maximum capacity of a 100-foot long LS-VFS 10 cfs
Peak flow directed to the LS-VFS cfs Do not complete this section of the form.
Is a flow bypass system going to be used? (Y or N)
Explanation of any "Other" responses above
LS-VFS Design
Forebay surface area 130 sq ft Forebay is undersized.
Depth of forebay at stormwater entry point 18 in Depth is appropriate.
Depth of forebay at stormwater exit point 6 in Depth is appropriate.
Feet of level lip needed per cfs 10 ft/cfs
Computed minimum length of the level lip needed 39 ft
Length of level lip provided 40 ft
Form SW401 - LS-VFS - 29Nov2010 - Rev.8 page 1 of 3
Width of VFS
Elevation at downslope base of level lip
Elevation at the end of the VFS that is farthest from the LS
Slope (from level lip to the end of the VFS)
Are any draws present in the VFS?
Is there a collector swale at the end of the VFS?
Bypass System Design (if applicable)
Is a bypass system provided?
Is there an engineered flow splitting device?
Dimensions of the channel (see diagram below):
M
B
W
y (flow depth for 10-year storm)
freeboard (during the 10-year storm)
Peak velocity in the channel during the 10-yr storm
Channel lining material
Does the bypass discharge through a wetland?
Does the channel enter the stream at an angle?
Explanation of any "Other" responses above
30 ft
268.50 fmsl
266.25 fmsl
7.50 %
N (Y or N) OK
N (Y or N)
Y (Y or N)
Y (Y or N) Please provide plan details of flow splitter & supporting calcs.
ft
ft
ft
It
ft
fUsec
Pick one:
N (Y or N)
Y (Y or N)
Bypass is a piped system with Outlet Protection prior to entering the stream.
W
it V
j B
1111. REQUIRED ITEMS` CHECKLIST'
EDIT 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.
Requried Item:
1. Plans (1" - 50' or larger) of the entire site showing:
Design at ultimate build-out,
Off-site drainage (if applicable),
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.
Initials
Form SW401 - LS-VFS - 29Nov2o10 - Rev.8 page 2 of 3
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. Plan details of the flow splitting device and supporting calculations (if applicable).
5. A construction sequence that shows how the level spreader will be protected from
sediment until the entire drainage area is stabilized.
6. If a non-engineered VFS is being used, then provide a photograph of the VFS showing
that no draws are present.
7. The supporting calculations.
8. A copy of the signed and notarized operation and maintenance (0&M) agreement.
D-2

D-2

D-2
D-1

Engineered is being used.
?•-: "? See Calculations

See 0 and M Agreement

Form SW401 - LS-VFS - 29Nov2010 - Rev.8 page 3 of 3
wAE
NCDENR
A7E9
s ,' r
Y
STORMWATER MANAGEMENT PERMIT APPLICATION FORM
401 CERTIFICATION APPLICATION FORM
LEVEL SPREADER - VEGETATED FILTER STRIP (LS-VFS) SUPPLEMENT
This form must be completely filled out, printed, initialed, and submitted.
L' PROJECT INFORMATION
Project name Dogwood
Contact name Kevin Varnell
Phone number 252.459.8196
Date June 20, 2011
Drainage area number 3
1l. DESIGN` INFORMATION
The purpose of the LS-VFS Buffer Rule: Diffuse Flow
Stormwater enters LS-VFS from The drainage area
Type of VFS Engineered filter strip (graded & sodded, slope < 8%)
Explanation of any "Other" responses above
If Stormwater Enters the LS-VFS from the Drainage Area
Drainage area 70,132 ftz
Impervious surface area 41,818 ft2
Percent impervious 59.63 %
Rational C coefficient 0.68
Peak flow from the 1 in/hr storm 1.09 cfs
Time of concentration 5.00 min
Rainfall intensity, 10-yr storm 7.38 in/hr
Peak flow from the 10-yr storm 8.04 cfs
Design storm 1 inch/hour storm
Maximum amount of flow directed to the LS-VFS 1.09 cfs
Is a flow bypass system going to be used? Y (Y or N)
Explanation of any "Other" responses above
If Stormwater Enters the LS-VFS from a BMP
Type of BMP
Peak discharge from the BMP during the design storm
Peak discharge from the BMP during the 10-year storm
Maximum capacity of a 100-foot long LS-VFS
Peak flow directed to the LS-VFS
Is a flow bypass system going to be used?
Pick one
cfs
cfs Do not complete this section of the form.
10 cfs
cfs Do not complete this section of the form.
(Y or N)
Do not complete this section of the form.
Explanation of any "Other" responses above
LS-VFS Design
Forebay surface area
Depth of forebay at stormwater entry point
Depth of forebay at stormwater exit point
Feet of level lip needed per cfs
Computed minimum length of the level lip needed
Length of level lip provided
84 sq ft Forebay is adequately sized.
18 in Depth is appropriate.
6 in Depth is appropriate.
10 ft/cfs
11 ft
12 ft
Form SW401 - LS-VFS - 29Nov2010 - Rev.8 page 1 of 3
Width of VFS
Elevation at downslope base of level lip
Elevation at the end of the VFS that is farthest from the LS
Slope (from level lip to the end of the VFS)
Are any draws present in the VFS?
Is there a collector swale at the end of the VFS?
Bypass System Design (if applicable)
Is a bypass system provided?
Is there an engineered flow splitting device?
Dimensions of the channel (see diagram below):
M
B
W
y (flow depth for 10-year storm)
freeboard (during the 10-year storm)
Peak velocity in the channel during the 10-yr storm
Channel lining material
Does the bypass discharge through a wetland?
Does the channel enter the stream at an angle?
Explanation of any "Other" responses above
30 ft
278.50 fmsl
277.00 fmsl
5.00 %
N (Y or N)
N (Y or N)
OK
Y (Y or N)
Y (Y or N) Please provide plan details of flow splitter & supporting calcs.
ft
ft
ft
ft
ft
fUsec
Pick one:
N (Y or N)
Y (Y or N)
A Piped Bypass will be utiltized with Outlet Protection prior to entering the stream.
V ??
1 B 1
1111. REQUIRED ITEMS CHECKLIST
EDIT 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.
Requried Item: Initials
1. Plans (1" - 50' or larger) of the entire site showing:
- Design at ultimate build-out,
Off-site drainage (if applicable),
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.
rayc v1 NJau anooL nunIuaI anu any nUica.
C-1,D-2
Form SW401 - LS-VFS - 29Nov2010 - Rev.8 page 2 of 3
W
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. Plan details of the flow splitting device and supporting calculations (if applicable).
5. A construction sequence that shows how the level spreader will be protected from
sediment until the entire drainage area is stabilized.
6. If a non-engineered VFS is being used, then provide a photograph of the VFS showing
that no draws are present.
7. The supporting calculations.
8. A copy of the signed and notarized operation and maintenance (0&M) agreement.
D-2

C-4

D-2
D-1

Engineered is being used.
See Calculations

See 0 and M Agreement

Form SW401 - LS-VFS - 29Nov2010 - Rev.8 page 3 of 3

aeT
????
#y _s ? r
7
?
NCDENR
STORMWATER MANAGEMENT PERMIT APPLICATION FORM
401 CERTIFICATION APPLICATION FORM
LEVEL SPREADER - VEGETATED FILTER STRIP (LS-VFS) SUPPLEMENT
This form must be completely filled out, printed, initialed, and submitted.
L `PROJECT INFORMATION
Project name Dogwood
Contact name Kevin Varnell
Phone number 252.459.8196
Date June 20, 2011
Drainage area number 4
II. DESIGN INFORMATION
The purpose of the LS-VFS Buffer Rule: Diffuse Flow
Stormwater enters LS-VFS from The drainage area
Type of VFS Engineered filter strip (graded & sodded, slope < 8%)
Explanation of any "Other" responses above
If Stormwater Enters the LS-VFS from the Drainage Area
Drainage area 192,535 ft
Impervious surface area 85,813 ftz
Percent impervious 44.57 %
Rational C coefficient 0.59
Peak flow from the 1 in/hr storm 2.59 cfs
Time of concentration 5.00 min
Rainfall intensity, 10-yr storm 7.38 in/hr
Peak flow from the 10-yr storm 19.11 cfs
Design storm 1 inch/hour storm
Maximum amount of flow directed to the LS-VFS 2.59 cfs
Is a flow bypass system going to be used? Y (Y or N)
Explanation of any "Other" responses above
If Stormwater Enters the LS-VFS from a BMP Do not complete this section of the form.
Type of BMP Pick one:
Peak discharge from the BMP during the design storm cfs
Peak discharge from the BMP during the 10-year storm cfs Do not complete this section of the form.
Maximum capacity of a 100-foot long LS-VFS 10 cfs
Peak flow directed to the LS-VFS cfs Do not complete this section of the form.
Is a flow bypass system going to be used? (Y or N)
Explanation of any "Other" responses above
LS-VFS Design
Forebay surface area 172 sq ft Forebay is adequately sized.
Depth of forebay at stormwater entry point 18 in Depth is appropriate.
Depth of forebay at stormwater exit point 6 in Depth is appropriate.
Feet of level lip needed per cfs 10 ft/cfs
Computed minimum length of the level lip needed 26 ft
Length of level lip provided 28 ft
Form SW401 - LS-VFS - 29Nov2010 - Rev.8 page 1 of 3
Width of VFS
Elevation at downslope base of level lip
Elevation at the end of the VFS that is farthest from the LS
Slope (from level lip to the end of the VFS)
Are any draws present in the VFS?
Is there a collector swale at the end of the VFS?
Bypass System Design (if applicable)
Is a bypass system provided?
Is there an engineered flow splitting device?
Dimensions of the channel (see diagram below):
M
B
W
y (flow depth for 10-year storm)
freeboard (during the 10-year storm)
Peak velocity in the channel during the 10-yr storm
Channel lining material
Does the bypass discharge through a wetland?
Does the channel enter the stream at an angle?
Explanation of any "Other" responses above
30 ft
283.70 fmsl
282.00 fmsl
5.67 %
N (Y or N) OK
N (Y or N)
Y (Y or N)
Y (Y or N) Please provide plan details of flow splitter & supporting calcs.
ft
ft
ft
ft
ft
ft/sec
Pick one:
N (Y or N)
Y (Y or N)
A Piped Bypass System will be Utiltized with Outlet Protection prior to Entering the Stream.

?. a
1 B 1
1111. REQUIRED ITEMS CHECKLIST
EDIT 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.
Requried Item:
1. Plans (1" - 50' or larger) of the entire site showing:
- Design at ultimate build-out,
Off-site drainage (if applicable),
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.
Initials Page or plan sheet number and any notes:
C-1,D-2
Form SW401 - LS-VFS - 29Nov2010 - Rev.8 page 2 of 3
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. Plan details of the flow splitting device and supporting calculations (if applicable).
5. A construction sequence that shows how the level spreader will be protected from
sediment until the entire drainage area is stabilized.
6. If a non-engineered VFS is being used, then provide a photograph of the VFS showing
that no draws are present.
7. The supporting calculations.
8. A copy of the signed and notarized operation and maintenance (0&M) agreement.
Form SW401 - LS-VFS - 29Nov2010 - Rev.8 page 3 of 3
Stocks Engineering, P.A.
1100 Eastern Avenue
PO Box 1108
Nashville, NC 27856
Project: Peachtree Phase II
Date: June 2, 20011
Page: 1 of 1
Post-Development
Runoff Computations
Temporary Diversion Runoff Calcs.
Tc Area ID Area (Ac.) C 110 Q10 (cfs)

5 1A 0.69 0.35 7.38 1.78
5 1 B 1.57 0.35 7.38 4.06

5 2A 0.55 0.35 7.38 1.42
5 2B 1.21 0.35 7.38 3.13

5 3A 0.74 0.35 7.38 1.91
5 3B 6.80 0.35 7.38 17.56

- Total 11.56 - 7.38 29.86

10-Year Storm
Channel Report
Hydraflow Express by Intelisolve
Temp. Diversion 1A
Triangular
Side Slopes (z:1) = 4.00, 4.00
Total Depth (ft) = 3.00
Invert Elev (ft) = 100.00
Slope (%) = 0.50
N-Value = 0.250
Calculations
Compute by: Known Q
Known Q (cfs) = 1.78
Elev (ft)
104.00
103.00
102.00
101.00
100.00
99.00
Section
0 5 10 15 20 25 30
Reach (ft)
Highlighted
Monday, Jun 27 2011
Depth (ft) = 1.23
Q (cfs) = 1.780
Area (sqft) = 6.05
Velocity (ft/s) = 0.29
Wetted Perim (ft) = 10.14
Crit Depth, Yc (ft) = 0.42
Top Width (ft) = 9.84
EGL (ft) = 1.23
Depth (ft)
4.00
3.00
2.00
1.00
0.00
-1.00
35
Channel Report
Hydraflow Express by Intelisolve
Temp. Diversion 1B
Triangular
Side Slopes (z:1) = 4.00, 4.00
Total Depth (ft) = 3.00
Invert Elev (ft) = 100.00
Slope (%) = 0.50
N-Value = 0.250
Calculations
Compute by: Known Q
Known Q (cfs) = 4.06
Elev (ft)
104.00
103.00
102.00
101.00
100.00
99.00
Section
Highlighted
Monday, Jun 27 2011
Depth (ft) = 1.67
Q (cfs) = 4.060
Area (sqft) = 11.16
Velocity (ft/s) = 0.36
Wetted Perim (ft) = 13.77
Crit Depth, Yc (ft) = 0.58
Top Width (ft) = 13.36
EGL (ft) = 1.67
D 5 10 15 20 25
Reach (ft)
30
Depth (ft)
4.00
3.00
2.00
1.00
0.00
-1.00
35
Channel Report
Hydraflow Express by Intelisolve
Temp. Diversion 2A
Triangular
Side Slopes (z:1) = 4.00, 4.00
Total Depth (ft) = 3.00
Invert Elev (ft) = 100.00
Slope (%) = 0.50
N-Value = 0.250
Calculations
Compute by: Known Q
Known Q (cfs) = 1.42
Elev (ft)
104.00
103.00
102.00
101.00
100.00
99.00
Section
0 5 10 15 20 25 30
Reach (ft)
Highlighted
Monday, Jun 27 2011
Depth (ft) = 1.13
Q (cfs) = 1.420
Area (sqft) = 5.11
Velocity (ft/s) = 0.28
Wetted Perim (ft) = 9.32
Crit Depth, Yc (ft) = 0.38
Top Width (ft) = 9.04
EGL (ft) = 1.13
Depth (ft)
4.00
3.00
2.00
1.00
0.00
-1.00
35
Channel Report
Hydraflow Express by Intelisolve
Temp. Diversion 2B
Triangular
Side Slopes (z:1) = 4.00, 4.00
Total Depth (ft) = 3.00
Invert Elev (ft) = 100.00
Slope (%) = 4.50
N-Value = 0.250
Calculations
Compute by: Known Q
Known Q (cfs) = 3.13
Elev (ft)
104.00
103.00
102.00
101.00
100.00
99.00
Section
Monday, Jun 27 2011
Highlighted
Depth (ft) = 1.01
Q (cfs) = 3.130
Area (sqft) = 4.08
Velocity (ft/s) = 0.77
Wetted Perim (ft) = 8.33
Crit Depth, Yc (ft) = 0.53
Top Width (ft) = 8.08
EGL (ft) = 1.02
5 10
15 20
Reach (ft)
25 30
Depth (ft)
4.00
3.00
2.00
1.00
0.00
-1.00
35
Channel Report
Hydraflow Express by Intelisolve
Temp. Diversion 3A
Triangular
Side Slopes (z:1) = 4.00, 4.00
Total Depth (ft) = 3.00
Invert Elev (ft) = 100.00
Slope (%) = 0.50
N-Value = 0.250
Calculations
Compute by: Known Q
Known Q (cfs) = 1.91
Elev (ft)
104.00
103.00
102.00
101.00
100.00
99.00
Section
Monday, Jun 27 2011
Highlighted
Depth (ft) = 1.26
Q (cfs) = 1.910
Area (sqft) = 6.35
Velocity (ft/s) = 0.30
Wetted Perim (ft) = 10.39
Crit Depth, Yc (ft) = 0.43
Top Width (ft) = 10.08
EGL (ft) = 1.26
5 10
15
Reach (ft)
20 25 30
Depth (ft)
4.00
3.00
2.00
1.00
0.00
-1.00
35
Channel Report
Hydraflow Express by Intelisolve
Temp. Diversion 3B
Triangular
Side Slopes (z:1) = 4.00, 4.00
Total Depth (ft) = 3.00
Invert Elev (ft) = 100.00
Slope (%) = 1.60
N-Value = 0.250
Calculations
Compute by: Known Q
Known Q (cfs) = 17.56
Elev (ft)
104.00
103.00
102.00
101.00
100.00
99.00
Section
Monday, Jun 27 2011
Highlighted
Depth (ft) = 2.33
Q (cfs) = 17.56
Area (sqft) = 21.72
Velocity (ft/s) = 0.81
Wetted Perim (ft) = 19.21
Crit Depth, Yc (ft) = 1.04
Top Width (ft) = 18.64
EGL (ft) = 2.34
5 10
15 20
Reach (ft)
25 30
Depth (ft)
4.00
3.00
2.00
1.00
0.00
-1.00
35
Skimmer Sediment Baser Worksheet
(Drainage Area Must be Less Than 10 Acres)
Area Disturbed = = Acres
Runoff Area Acres
Q10 -CxIXA -.t x 7
A
. , _ cf s
Basin Volume Calculation:
Volume of Sediment=
( Ac.) x (1800 cf sed./year) x (1 year)
cf
Assume foot of basin depth, therefore area of the pit t? Square Feet
Try ( wide) x ( long) x ( foot deep) _Sediment Basin
Surface Area Calculation:
Surface Area (SF) = Qio x 325 sf/cfs
? L ' x 325 sf/cfs
sf
Surface Area - c
Use (. wide) x ( long) x ( foot deep) Sediment Basin
- Surface Area -
Weir Design and VelocitU Check:
Quo = cfs; Q = CLH3/2. H = [Q/CL]2i1
(2.68))]2/3
feet
Velocity Check -3 ( ) ( '"f ) ( `` ; _
fps OK

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1 667 500 METERS '40
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Produced by the United States Geological Survey
an cooperation with the North Carolina Department
of Environment and Natural Resources
Topography compiled 1962. Planimetry derived from imagery
taken 1998 and other sources. Survey control current as of 1964
North American Datum of 1983 (NAD 83). Projection and
T_ 000-meter grid: Universal Transverse Mercator, zone 17
2 500-meter ticks: North Carolina Coordinate System of 1983
North American Datum of 1927 (NAD 27) is shown by dashed
corner ticks. The values of the shift between NAD 83 and
SAD 27 for 7.5-minute intersections are obtainable from
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