20041223 Ver 1_More Info Received_20040819

Kevin Martin
From: Akers, Ryan [[e-mail]]
Sent: Thursday, August 19, 2004 9:46 AM
To: [e-mail]
Cc: Munn, Mike; Beckett, Jeremy
Subject: DWQ Comments

aerial photo of existing plan culvert culvert trib.pdf culvert profiles.pdf Is calcs_001.pdf Is plans OOi.pdf
existing_OOi.p... view_OOi.pdf calcs_OOl.pdf
Kevin:
I have atta ched several pdf. files that will address all of the DWQ comm ents.
Here's the list:
Comment #2 aerial photo of existing taken back in 2001 which shows the extent of the
wooded regions, and existing plan view shows the current existing topography and roads.
«aerial photo of existing_OOl.pdf» «existing plan view_OOl.pdf»
Comment #3 includes our culvert calculations. This has the inverts, size and velocities
of the culverts. Another files shows the tributary areas for both of the culverts, as
well as the tributary area for a fourth level spreader which will be addressed in comment
#7.
«culvert calcs_OOl.pdf» «culvert trib.pdf»
Comment #4 includes the longitudinal cross section that shows the stream bed invert at the
inlet and outlet, the existing. stream bank elev. and the invert of the inlet anal outlet of
the pipes.
«culvert profiles.pdf»
Comment #5 You should be receiving from John Myers' office.
Comment #6 Is addressed in both the culvert calculations and in the culvert profiles.
Comment #7 we have included the Level Spreader Calculations for the 4th LS as well as
pdf's of all the LS's in plan view.
is calcs_OOl.pdf» «ls plans_001.pdf»
I hope that this answers all comments in their entirety
you can email me or call me at 361-5000.
Thanks,
Ryan Akers, EI
Engineering Designer
THE JOHN R. McADAMS COMPANY, INC.
2905 Meridian Parkway
Durham, NC 27713
919-361-5000 RTP, NC Office
704-527-0800 Charlotte, NC Office
[e-mail]
If you have any other questions
pal ~~~ ~R~®'~
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The John R. McAdams Company, Inc. provides a unique collection of land development design
services including land planning, zoning administration and permitting, surveying, site
engineering, contract administration, landscape architecture, stormwater'management, and
traffic engineering. McAdams has offices in Durham and Charlotte, North Carolina. For
more information, visit www.johnrmcadams.com
McADAMS COMPANY: Assisting our clients to have successful projects for over 25 years.
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THE JOHN R. McADAMS COMPANY, INC.
P.O. Box 14005
Research Triangle Park, North Carolina 27709
[phone] [phone] Fax
PAGE OF
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Culvert Calculator Report
Culvert #1
Solve For: Section Size
Culvert Summary
Allowable HW Elevation 262.00 ft Headwater Depth/ Height 1.76
Computed Headwater Elevation 261.28 ft Discharge 56.90 Cfs
Inlet Control HW Elev 260.57 ft Tailwater Elevation 259.00 ft
Outlet Control HW Elev 261.28 ft Contra( Type Outlet Control

Grades
Upstream Invert 256.00 ft Downstream Invert 255.00 ft
Length 106.00 ft Constructed Slope 0.009434 ft/ft

Hydraulic Profile
Profile Pressure Depth, Downstream 4.00 ft
Slope Type N/A Normal Depth 2.18 ft
Fbw Regime
Velocity Downstream N/A ~
8.05 ft/s Critical Depth
Critical Slope 2.44 ft
0.007357 ft/ft

Section
Section Shape Circular Mannings Coefricient 0.013
Section Material
Section Size Concrete
36 inch ~`~ Span
Rise 3.00 ft
3.00 ft
Number Sections 1

Outlet Control Properties
Outlet Control HW Elev 261.28 ft Upstream Velocity Head 1.01 ft
Ke 0.50 Entrance Loss 0.50 ft

Inlet Control Properties
Inlet Control HW Elev 260.57 ft Flow Control Submerged
inlet Type Square edge w/headwall Area Fufi 7.1 ft=
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Project Title: Ph. 37-39 Stream Impacts Project Engineer. Ryan Akers
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08/19/04 07:58:31 AM ®Haestad Methods, Inc. 37 Brookside Road Waterbury, CT 06708 USA [phone] Page 1 of 1

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Culvert Calculator Report
Culvert #2
Solve For: Section Size
Culvert Summary
Allowable HW Elevation 262.00 ft Headwater Depth/ Height 1.86
Computed Headwater Elevation 261.72 ft Discharge 24.60 cfs
inlet Control HW Elev 261.72 ft Tailwater Elevation 256.00 ft
Outlet Control HW Elev 261.41 ft Control Type Inlet Control

Grades
Upstream Invert 258.00 ft Downstream Invert 252.00 ft
Length 104.00 ft Constructed Slope 0.057692 ft!ft

Hydraulic Profile
Profile CompositePressureSlS2 Depth, Downstream 0.97 ft
Slope Type N/A Normal Depth 0.94 ft
Flow Regime N/A Critical Depth i.75 ft
Velocity Downstream ~
18.23 ft!s Critical Slope 0.010700 ft/ft

Section
Section Shape Circular Mannings Coefficient 0.013
Section Material Concrete Span 2.00 ft
Section Size 24 inch Rise 2.00 ft
Number Sections 1

Outlet Control Properties
Outlet Control HW Elev 261.41 ft Upstream Veocity Head 1.11 ft
Ke 0.50 Entrance Loss 0.55 ft

Inlet Control Properties
Inlet Control HW Elev 261.72 ft Flow Control Submerged
.Inlet Type Square edge w/headwall Area Full 3.1 ft=
K 0.00980 HDS 5 Chart 1
M 2.00000 HDS 5 Scale 1
C: 0.03980 Equation Form 1
Y 0.67000

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Project Title: Ph. 37-39 Stream Impacts
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Culvert Calculator Report
Culvert #1
Solve For: Secfion Size
Culvert Summary
Allowable HW Elevation 262.00 ft Headwater Depth/ Height 1.52
Computed Headwater Elevation 261.33 ft Discharge 80.80 cfs
Inlet Control HW Elev 261.14 ft Tailwater Elevation 259.00 ft
Outlet Control HW Elev 261.33 ft Control Type Outlet Control

Grades
Upstream Invert 256.00 ft Downstream Invert 255.00 ft
Length 106.00 ft Constructed Slope 0.009434 ft/ft

Hydraulic Profile
Profile Pressure Depth, Downstream 4.00 ft
Slope Type N/A Normal Depth 2.43 ft
Flow Reg(me N/A
Velocity Downstream 8.40 ft/s ~ Critical Depth
Critical Slope 2.81 ft
0.006717 ft/ft

Section
Section Shape Cirwlar Mannings Cdefficient 0.013
Section Material Concrete Span ~ 3.50 ft
Section Size 42 inch ~~ Rise 3.50 ft
Number Sections 1

Outlet Control Properties
Outlet Control HW Elev 261:33 ft Upstream Velocity Head 1.10 ft
Ke 0.50 Entrance Loss 0.55 ft

Inlet Control Properties
Inlet Control HW Elev 261.14 ft Flow Control Submerged
Inlet Type Square edge w/headwall Area Full 9.6 ft3
K 0.00980 HDS 5 Chart 1
M 2.00000 HDS 5 Scale 1
C 0.03980 Equation Form 1
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Culvert Calculator Report
Culvert #2
Solve For: Section Size
Culvert Summary
Allowable HW Elevation 262.00 ft Headwater Depth/ Height 1.45
Computed Headwater Elevation 261.63 ft Discharge 35.00 cfs
Inlet Control HW Elev 261.63 ft Tailwater Elevation 256.00 ft
Outlet Control HW Elev 261.61 ft Control Type Inlet Control

Grades
Upstream Invert 258.00 ft Downstream Invert ~ 252.00 ft
Length 104.00 ft Constructed Slope 0.057692 ft/ft

Hydraulic Profile
Profile CompositePressureSlS2 Depth, Downstream 1.08 ft
Slope Type N/A Normal Depth 1.03 ft
Flow Regime
Velocity Downstream N/A ~
17.22 ft/s Critical Depth
Critical Slope 2.01 ft
0.007553 ft/ft

Section
Section Shape Circular Mannings Coefficient 0.013
Section Material
Section Size Concrete
30 inch ~~ Span
Rise 2.50 ft
2.50 ft
Number Sections 1

Outlet Control Properties
Outlet Gontrol HW Elev 261.61 ft Upstream Veocity Head 1.06 ft
Ke 0.50 EnUance Loss .0.53 ft

Inlet Control Properties
Inlet ConVol HW Elev 261.63 ft Flow Control Submerged
Inlet Type Square edge w/headwall Area- Full 4.9 ft=
K 0.00980 HDS 5 Chart 1
M 2.00000 HDS 5 Scale 1
C 0.03980 Equation Form 1
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Project Title: Ph. 37-39 Stream Impacts Project Engineer. Ryan Akers
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08/19/04 08:19:48 AM ~ Haestad Methods, Ina 37 Brookside Road Waterbury, CT 06708 USA [phone] Page 1 of 1

Aug. 19. 2004 10:00AM No. 2165 P. 2
LEVEL SPREADER OPERATION AND MAINTENANCE AGREEMENT
The level spreader system is defined as a graded pretreatment level spreader used to diffuse
concentrated flow.
Maintenance activities shall be performed as follows:
Every six months:
a. Inspect the level spreader system for sediment accumulation, erosion, trash
accumulation, vegetated cover, and general condition.
b. Check and clear the orifice of any obstructions such that the full length of the level
spreader functions as designed.
2. Repair ®roded areas immediately, re-seed as necessary to maintain good vegeaaty® cover,
mow vegetative cover to maintain a maximum height of six inches, and remove trash as
needed.
3. Inspect and repair the collection system (i.e, catch basins, piping, swales, riprap, etc.)
quarterly to maintain proper functioning.
4. Ramave accumulated sediment from the level spreader system semi-annually using
cleanout structures at the end of each length of level spreader. Removed sediment shall
be disposed of in an appropriate manner and shall be handled in a manner that will not
adversely impact water quality (i.e. stockpiling near a stream, pond, etc.).
5. All components of the level spreader system shall be maintained in good working order.
6. A level elevation shall be maintained across the entire flow spreading structure. Any down
gradient erosion must be repaired and/or replanted as necessary.
I acknowledge and agree by my signature below that I am responsible for the performance of
the seven maint®nance procedures fisted above.. I agree to notify DWQ of any problems with
the system or prior to any changes to the system or responsible party.
Print name: Cailev 1_. Gerber -Brandywine. L.L.C
Title: Attorne~in -fact
Address: 3209 Gresham Lake Road. Suite 160 Raleigh. NC 27615
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.
Page 1 0£2

Aug. 19. 2004 10; OOAM
No. 2165 P. 3 .
1, William H. Sutton, s Notary Public for the State of North .Carolina, County of Wake, do hereby
certify that Callev I_. Gerber personally appeared before me this 19th day of A~cu ,., 2004, and
acknowledge the due execution of the forgoing wet jwetland~ detenti n basin maintenance
requirements. Witness my hand and official seal, ~~,~ 4j~,,,~ ~,~,.
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My commission expires12-29-Oi
Pabe 2 of 2

OcA erunlny, inc. 80844 Form 10017

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~P.....-~'f~'......~~t~J-.._..~..~~._.__.._.~_,_.,.-.._.. ~,.i~~ COMPANY, INC.
TH~JOHN R.
D~G~~_-~~~~~,_~.._~__~__ _.._____ RESEARCH TRIANGLE PARK, NC
4~~~ _ P.O. BOX 14005 ZIP 27709-4005
[phone]
L i-v~-T .. . ! ~u~.u.~..........._..... _._....._._..__._....

Oc9 Bruning, Inc, 8084< Form 10017
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THE JOHN R. McAE,DR~~jNY, INC.
RESE~~CH 1RfANGLE PARK, NC
I P.O. BOX .14005 ZIP 277,09-4005
[phone]
N ac~~ -~
-- ~ETIANDS 14~~ ~~ ....

DWQ Project No:
DIVISfON OF WATER QUALITY -LEVEL SPREADER WORKSHEET
I. PROJECT INFORMATION (please complete the following information):
Project Name : WDL-01000 Bedford Phases 37.39
Contact Person: Ryan C. Akers Phone Number. {919) 361.5000
Level Spreader ID: LS 4
Level Spreader Length 36 (perpendicular to fbw)
Drainage Area 0.4 ac. (on-site and off-site drainage to the level spreader)
Impervious Area 0.40 ac. (on-site and off-site drainage to the level spreader)
Maximum Filter StriplBuffer Slope 8 ~° (696 for forested, leaf littler cover, 896 for thick ground cover)*
grass
Max Discharge from a 10 Year Storm 2.74 cfs
Max Discharge to Level Spreader 2.74 cfs
Filter StriplBuffer Vegetation Thck gr. cover (thick ground cover or grass, canopied forest with leaf litter
groundcover)
Pre-treatment or Bypass Method Pre•Treatment
il. REQUIRED ITEMS CHECKLIST
Initial in~the space provided to indicate the following design requirements have been met and supporting documentation is
attached. /f a requirement has not been met, attach an explanation of why. At a minimum, a complete stormwatermariagement
plan submittal includes a worksheet for each BMP, design calculations, plans and specifications showing all BMPs and outlet
structure details, a detailed drainage plan and a fully executed operation and maintenance agreement. An incomplete submittal
package will result in a request for additional informafwn and will substantially delay final review and approval of the project
icants Initials
Level spreader is at least 13 ft per cfs for thick ground cover or grass or 100 ff per cfs in canopied forest with leaf
litter.
-Form Scour Holes are on flat slopes only
No struciures are located in protected buffers*
If bypass method speafied in the Draft Level Spreader Design Option Document:
Bypass method is specified ('rf applicable) and plan details and calculations are provided
Discharge to level spreader and subsequent filter strip is hydraulically and spatially separate from the bypass
discharge.
No structures are located in protected buffers.
Plan details for the bypass-and outlets are provided.
The operation and maintenance agreement includes annual erosion and vegetation repair.
The operation and maintenance agreement signed and notarized by the responsible party is provided.
* Level spreaders in series can be used on slopes of up to 15°~ in forested areas with leaf littler cover or on slopes of up to 25%
in areas with thick ground cover or grass if designed according to the. Draft Level Spreader Design Option Document This
poten6aliy requires a minor variance in protected buffer areas. In any event the second level spreader cannot. be located in Zone
1 of a protected buffer area.

THE JOHN R. McADAMS COMPANY, INC.
P.0. Box 14005
Research Triangle Park, North Carolina 27709
[phone] [phone] fax
PAGE OF
J R McA JOB NO..(y~.-O/pao DATE ~$~0~_ BY ~. A~ZS CHECKED BY
(Date)
CLIENT PROJECT
SUBJECT
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