20061146 Ver 6_Modifications_20101012

WITHERS , R"F-NEL
ENGINEERS I PLANNERS I SURVEYORS
111 MacKenan Drive
Cary, North Carolina 27511
Tel.:[phone] Fax: [phone]
TO: NCDENR - DWQ
Acting Supervisor - 401/Wetlands Permitting and
Oversight Unit
2321 Crabtree Blvd. Suite 250
Raleigh, NC 27604
WE ARE SENDING YOU ? Attached
? Shop Drawings ® Prints
? Copy of Letter ? Change order
LEE G3 OO F T ° ° HOHMAL
DATE 10/12/2010 Job No. 02090556
ATTENTION Mr. Ian McMillan
RE: Park West Village
DWQ Project # 06-1146, V .
v u- I N!o V to

? Under separate cover via the following
® Plans ? Samples Specifications
® CD ?
COPIES DATE NO. DESCRIPTION
1 10/12/10 Permit Modification Request Letter
1 10/12/10 Revised Impact Map
5 10/12/10 Drawings with Calculations

a
?

WETLANDS AND 5T0Rt *.k*lTR BRANCH

THESE ARE TRANSMITTED as checked below:
® For approval ? Approved as submitted
® For your use ? Approved as noted
? As requested ? Returned for corrections
® For review and comment ?
? FOR BIDS DUE 20 ? PRINTS RETURNED AFTER LOAN TO US
REMARKS:
COPY TO: Tom Lowell, Casto SIGNED: Dan Miller, PE
? Resubmit
? Submit
? Return
copies for approval
copies for distribution
corrected prints
If enclosures are not as noted, kindly notify us at once.
WITHERS RAVENEL
ENGINEERS I PLANNERS I SURVEYORS
12 October 2010
NCDENR/Division of Water Quality
Acting Supervisor - 401/Wetlands Permitting and Oversight Unit
2321 Crabtree Blvd. Suite 250
Raleigh, NC 27604
ATTN: Mr. Ian Mcillan
RE: Park West Village
Crossing #4 Modification
DWQ Project # 06-1146, Ver
W&R No. 02090556
Dear: Mr. McMillan
I am forwarding to your attention revised drawings for Crossing #4 at Park West Village per your
request along with the associated supporting calculations. The most recent approved design called
for the installation of a 6' x 4' box culvert. Based on further analysis we would like to revise the
design to a 60' RCP pipe with an 8' inside diameter manhole to serve as a junction box. The
revised design is clearly indicated on the five sets of revised drawings.
I appreciate your attentiveness to this matter and look forward to your response. Should you have
any questions please feel free to contact me directly.
Thank you.
Sincerely,
WITHERS RAVENEL, INC.
Dan Miller, PE
Enclosures
cc:
iii MacKenan Drive 1 Cary, NC 27511 1 tel:[phone] I fax:[phone] I www.withersravenel.com
1410 Commonwealth Drive 1 Suite tot 1 Wilmington, NC 284031 tel: [phone] fax: [phone]
06 D Gallimore Dairy Road 1 Greensboro, NC 27409 1 tel: [phone]
Culvert Designer/Analyzer Report
Bristol Creek Entry Drive
Analysis Component
Storm Event Design Discharge 78.22 ch;
Peak Discharge Method: SCS Peak Discharge
Design Rainfall Depth 6.41 in Check Rainfall Depth 8.00 in
Design Peak Discharge 78.22 cis Check Peak Discharge 101.72 cis
Total Area 9.10 acres Time of Concentration 5.00 min
Weighted Curve Number 89 Rainfall Type Type II

Area
Subwatershed(acres) CN
1 1.50 74
2 1.50 70
3 6.10 98
Tailwater Conditions: Constant Tailwater
Tailwater Elevation N/A It
Name Description Discharge HW Elev. Velocity
Culvert-1 1-54 inch Circular' 78.22 cfs 357.8611 15.60 it/s
Weir Not Considered N/A NIA N/A
4k,
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Title: Park West Village Culverts Project Engineer: PCovil
k'N...%park west village culverts 60m.cvm Withers 6 Ravenei Engineering CulvertMaster v3.1 (03.01.010.00)
10/07110 12:05:49 PM c Bentley Systems. Inc. Haestad Methods Solution C,:nter Watertown. CT 06795 USA +1-203-755.1666 Page 1 of 2

Culvert Designer/Analyzer Report
Bristol Creek Entry Drive
Component:CuNert-1
Culvert Summary
Computed Headwater Elevation 357.86 It
Inlet Control HW Elev. 357.62 It
Outlet Control HW Elev. 357.86 It
Headwater Depth/Height 0.86 Discharge 7822 cis
Tailwater Elevation N/A ft
Control Type Entrance Control

Grades
Upstream Invert
Length 354.00 ft
105.00 It Downstream Invent
Constructed Slope 351.00 It
0.031579 ft/ft

Hydraulic Profile
Profile
Slope Type
Flow Regime
Velocity Downstream S2
Steep
Supercritical
15.60 ft/s Depth, Downstream
Normal Depth
Critical Depth
Critical Slope 1.59 ft
1.45 It
2.59 It
0.004008 tuft

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

Outlet Control Properties
Outlet Control HW Elev.
Ke 357.86 ft
0.20 Upstream Velocity Head
Entrance Loss 1.06 It
0.21 It

Inlet Control Properties
Inlet Control HW Elev. 357.62 It
Inlet Type Groove end w/headwall
K 0.00180
M 2.00000
C 0.02920
Y 0.74000 Flow Control
Area Full
HDS 5 Chart
HDS 5 Scale
Equation Form Unsubmerged
15.9 ft2
1
2
1
Title: Park West Village Culverts Project Engineer: PCovil
kA..%park west village culverts 60in cvm Withers ti Ravenal Engineering CulvertMaster v3.1 [03.01.010.00]
10/07/10 12.05:49 PM c Bentley Systems. Ina Haestad Methods Solution Center Watertown. CT 06795 USA [phone] Page 2 of 2

lWyr 1n?z
Culvert Designer/Analyzer Report
Bristol Creek Entry Drive
Analysis Component
Storm Event Check Discharge 101.72 cfs
Peak Discharge Method: SCS Peak Discharge
Design Rainfall Depth 6.41 in Check Rainfall Depth 8.00 in
Design Peak Discharge 78.22 efs Check Peak Discharge 101.72 cfs
Total Area 9.10 acres Time of Concentration 5.00 min
Weighted Curve Number 89 Rainfall Type Type II
Area
Subwatershed(acres) CN
1 1.50 74
2 1.50 70
3 6.10 98

Talwater Conditions: Constant Tailwater
Tailwater Elevation N/A ft
Name Description Discharge HW Elev. Velocity
Culvert-1 1-54 inch Circulav# 101.72 cfs 358.53 it 16.43 fits
Weir Not Considered WA N/A N/A
?' 60" Cul%)e& boxlea Is"
Title: Park West Village Culverts Project Engineer: PCovil
k:l..\park west village culverts 60in.cvm Withers & Ravenel Engineering CulvertMaster v3.1 [03.01.010.00]
10107/10 12:06:44 PM c Bentley Systems. Inc. Haestad Methods Solution Center Watertown, CT 06795 USA [phone] Page 1 of 2

1.6 o\r- 2R-
Z--Culvert Designer/Analyzer Report
Bristol Creek Entry Drive
Component:Culvert-1
Culvert Summary
Computed Headwater Elevation 358.53 It
Inlet Control HW Elev. 358.27 It
Outlet Control HW Elev. 358.53 It
Headwater Depth/Height 1.01 Discharge 101.72 cfs
Tailwater Elevation N/A ft
Control Type Entrance Control

Grades
Upstream Invert
Length 354,00 ft
105.00 ft Downstream Invert
Constructed Slope 351.00 ft
0.031579 ft/ft

Hydraulic Profile
Profile
Slope Type
Flow Regime
Velocity Downstream S2
Steep
Supercritical
16.43 ft/s Depth, Downstream
Normal Depth
Critical Depth
Critical Slope 1.86 ft
1.66 ft
2.96 ft
0.004502 ft/ft

Section
Section Shape
Section Material
Section Size
Number Sbctions Circular
Concrete
54 inch
1 Mannings Coefficient
Span
Rise 0.013
4.50 R
4.50 ft

Outlet Control Properties
Outlet Control HW Elev.
Ke 358.53 ft
0.20 Upstream Velocity Head
Entrance Loss 1.30 ft
0.26 ft

Inlet Control Properties
Inlet Control HW Elev. 358.27 ft
Inlet Type Groove end w/headwall
K 0.00180
M 2.00000
C 0.02920
Y 0.74000 Flow Control
Area Full
HDS 5 Chart
HDS 5 Scale
Equation Form Unsubmerged
15.9 ft2
1
2
1
Title: Park West Village Culverts Project Engineer: PCovil
k:1...%park west village culverts 60in.cvm Withers 6 Ravenel Engineering CulvertMaster v3.1 [03.01.010.00)
10/07110 12:06:44 PM c Bentley Systems, Inc. Haestad Methods Solution Center Watertown, CT 06795 USA [phone] Page 2 of 2
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