20020821 Ver 1_COMPLETE FILE_20020523

DESIGN kX RAATIVE
NCDENR DW - ST
Q ORMWATER REVIEW
WITH SUPPORTING CALCULATIONS
NCSU Centennial Campus
Central Utility Plant
Raleigh
' Wake County, North Carolina

April 2002

McKim & Creed 01724-0006
Prepared by:
McKim & Creed, P.A.
5625 Dillard Dr., Suite 117
' Cary, NC 27511
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DESIGN NARRATIVE
FOR
NCDENR DWQ - STORMWATER REVIEW
WITH SUPPORTING CALCULATIONS
NCSU Centennial Campus
Central Utility Plant
Raleigh
Wake County, North Carolina
April 2002
McKim & Creed 01724-0006
Prepared by:
McKim & Creed, P.A.
5625 Dillard Dr., Suite 117
Cary, NC 27511
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Table of Contents
Description Page
Design Narrative 1-2
Storm Drainage Calculations 3-6
Sediment Trap Calculations 7
Pond and Forebay Calculations 8-19
Total Nitrogen Load Calculations 20-23
' Level Spreader Calculations 24
Buoyancy Calculations 25-26

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DESIGN NARRATIVE
1. GENERAL
The project site is located at the southwestern corner of the intersection of Centennial
Parkway and Main Campus Drive on the NCSU Centennial Campus in Raleigh, N.C.
The intent of this project is to develop the project site with a two-story building,
mezzanine, catwalk, drives, parking areas, and utilities necessary to support the
proposed building.
2. EXISTING SITE
The existing site is currently undeveloped. The drainage area of the project site is
mostly wooded. The natural drainage is generally from the east to west and flows into
existing drop inlets and into an existing swale that is located in the northwest portion of
the site. This site has an average slope of approximately 2%. There is an approximate
40-foot change in elevation from the east side of the site to the west side of the site.
3. PROPOSED IMPROVEMENTS
Stormwater Management will be handled by the use of rur,:)ff devices per
"Best Management Practices" guidelines of North Carolina State University/Centennial
Campus. This site will incorporate a combination of methods to minimize stormwater
runoff and to slow and infiltrate water near the source, rather than depending on one
large device to control the entire watershed. Stormwater devices will be incorporated
into the landscape plan to minimize negative impacts on the environment.
Stormwater runoff from the site will be diverted directly into the new stormwater
drainage system. The stormwater runoff from the southern portion of the site will flow
through the new drainage system and into a level spreader that is located at the end of
the system. The level spreader will allow the stormwater to sheet flow into an existing
forested filter system so to avoid erosion at the outlet point.
The back parking lot and rear of the site will drain to a new drainage system and into a
proposed wet detention pond, which will be designed for "water quality" and "water
quantity" purposes. This pond will have a forebay and vegetated aquatic bench for
water quality purposes. The pond will have a controlled outlet structure and barrel pipe.
The stormwater will then enter a vegetated filter to a new grass-lined swale and into an
existing stormwater drainage system at the upper west side of the site. The pond is
sized per "Best Management Practices" and will be sized to handle the rear of the
proposed site, as well as, the stormwater that will be created by future development to
the east of the current project site. The pond will contain a permanent water quality
pool and temporary water quality pool. The permanent pool will be sized using the
Surface Area/Drainage Area (SA/DA) ratio and will have minimum depth of 3 feet.
This ratio is based upon 85% TSS removal. The temporary pool will be sized to detain
the runoff volume from the first inch of rain. The outlet structure and barrel will be sized

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to release the runoff volume associated with the first inch of rainfall over a drawdown
period of 48 to 120 hours. The pond was modeled for the 10yr storm to verify that there
would be no detrimental effects downstream.
The total nitrogen loading in the stormwater runoff for the northern portion of this project
was calculated to be 8.54 Ibs/ac/yr. The wet detention pond (25% reduction), the 30
foot vegetated filter (20% reduction) and the grass-lined swale (30% reduction) will all
be implemented to reduce the nitrogen loading to 3.59 Ibs/ac/yr. This amount is lower
than 3.6 Ibs/ac/yr which is the required reduction for total nitrogen removal for new
development according to the Neuse River Stormwater Program for Nitrogen Control. A
level spreader and forested filter strip, which has a nitrogen removal rate of 20%, will
also be implemented to reduce the nitrogen loading of the southern portion of the
project from 8.60 Ibs/ac/yr to 6.88 Ibs/ac/yr. This amount is higher than the required 3.6
Ibs/ac/yr and therefore additional BMP's would be needed or a one time offset payment
of $1,082 would be in order. See attached calculations and plans for more detail.
The Best Management Practice's (BMP's) design criteria for the level spreader and the
wet detention pond were followed and meet the required specifications described in the
N.C. Design Manual.
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4. EROSION CONTROL CONSIDERATIONS
All culvert inlets will be protected with temporary inlet protection and the outlets will
have rip rap dissipater pads to minimize sediment migration through the storm drainage
system and to protect against erosion. In addition, silt fencing will be located on the low
side of the affected areas except where it would impede the flow of storm water in
channels. The temporary construction entrance will be located at the entrance/exit
point of the new work area. All erosion control measures are documented on the
erosion control plan and detail sheet. Three sediment traps will be needed for this
project. In the first phase of the erosion control plan, all three traps should be installed
as shown on plans. During the second phase, the storm drainage system should be
installed and sediment trap 3 should be removed. See calculations for the sediment
traps.
5. DRAINAGE CALCULATIONS
A complete set of calculations for the stormwater drainage is attached.
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WATER QUALITY POND CALCULATIONS
Project Name
NCSU - Central Utilities Plant
Project Number
1724-0006
Date
05-Nov-01
3rd revision
2nd revision
1 st revision
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Water Quality Pond Drainage Area Data
Project NCSU - Central Utilities Plant
Project No. 1724-0006
Date 5-Nov-01
Total site area 199,069 square feet = 4.57 acres
Dra inage area to and Other Drai nage Area

Impervious areas Existing
s Proposed
s Change
s Existing
s Proposed
s
On-site buildings 0 0 0 0 0
On-site streets 0 0 0 0 0
On-site parking 0 0 0 0 0
On-site sidewalks 0 0 0 0 0
Other on-site 0 100,623 100,623 0 0
Total off-site impervious 0 0 0 0 0
Total Impervious 0 100,623 100,623 0 0
Dra inage area to and Other Drai nage Area

Non-impervious areas Existing
s Proposed
s Change
s Existing
s Proposed
s
On-site grass/landscape 0 98,446 98,446 0 0
On-site woods 0 0 0 0 0
Other undeveloped 0 0 0 0 0
Total off-site non-impervious 0 0
- 0
- 0 0
Total non-impervious 0 98,446
t 9-8,446 0 0
Total Drainage Area 199,069 199,069 0 0 0
Percent Impervious 0.0 50.5 50.5 n/a n/a
Notes:
Temp Water Quality Pond Calculations 11-05-01.xls
Site Drainage Area Data Page 1 of 1
41
Printed 4/18/2002 1:54 PM
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10

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Water Quality Pond Surface Area Calculations
Project
Project No
Date
NCSU - Central Utilities Plant
1724-0006
5-Nov-01
Total on-site drainage area to pond 199,069 square feet
Total impervious area in drainage area 100,623 square feet
Average water depth of basin at normal pool 3.0 feet
Location of site Raleigh
Site region Piedmont
% Impervious cover 50.5 percent
If the site is in a coastal area, will a vegetative filter be used? n/a
Surface Area/Drainage Area Ratios:
For a site in the Piedmont 2.1 percent
For a site in a Coastal County w/ Vegetative Filter 4.2 percent
For a site in a Coastal County w/out Vegetative Filter 5.7 percent
Required surface area of pond:
For a site in the Piedmont 4,140.0 square feet
For a site in a Coastal County w/ Vegetative Filter 8,450.0 square feet
For a site in a Coastal County w/out Vegetative Filter 11,310.0 square feet
Notes:
Temp Water Quality Pond Calculations 11-05-01.xls
Pond Surface Area Calcs Page 1 of 1
Printed 4/18/2002 1:54 PM
r
Water Quality Pond Stormwater Runoff Volume Calculations
Project NCSU - Central Utilities Plant
Project No. 1724-0006

Date 5-Nov-01

Drainage area 199,069 square feet
Impervious area 100,623 square feet
Rainfall depth 1.00 inches

Percent Impervious 50.5 percent

R(v)=0.05+0.009*(Percent impervious)
Runoff coefficient - R(v) 0.50 in/in
Runoff volume=(Design rainfall)*(R(v))*(Drainage area)
Runoff volume 8,376.2 cubic feet
Notes:
Temp Water Quality Pond Calculations 11-05-01.xls
Runoff Volume Calcs Page 1 of 1
i ?_
Printed 4/18/2002 1:54 PM

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1

Water Quality Pond Volume Calculations
Stage-Storage Data for Pond
Project NCSU - Central Utilities Plant
Project No. 1724-0006
Date 05-Nov-01

Contour ID
Stage
Area
[s q. ft.
Area
acres Incremental
Area
[s q. ft. Incremental
Area
acres Incremental
volume
cu. ft Incremental
volume
acre-ft Cumulative
volume
cu, ft Cumulative
volume
acre-ft
389 0 4,231.0 0.097 4,231.0 0.1 0.0 0.0 0.0 0.0
390 1 5,158.0 0.118 927.0 0.0 4,694.5 0.1 4,694.5 0.1
390.75 1.75 5,892.0 0.135 734.0 0.0 4,143.8 0.1 8,838.3 0.2
391 2 6144.0 0.141 252.0 0.0 1,504.5 0.0 10,342.8 0.2
392 3 71191.0 0.165 1,047.0 0.0 6.667.5 0.2 17 010.3 0.4

Temp Water Quality Pond Calculations 11-05-01.xls
Pond Stage-Storage Data Page 1 of 1
a
Printed 4/18/2002 1:54 PM

I

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Water Quality Pond Volume Calculations
Stage-Storage Data for Pond
Project NCSU -Central Utilities Plant
Project No. 1724-0006
Date 05-Nov-01

Contour ID
Stage
Area
[sq. ft.
Area
acres Incremental
Area
[sq. ft. Incremental
Area
acres Incremental
volume
cu.ft Incremental
volume
acre-ft Cumulative
volume
cu.ft Cumulative
volume
acre-ft
386 0 1828.0 0.042 1828.0 0.0 0.0 0.0 0.0 0.0
387 1 2,574.0 0.059 746.0 0.0 2,201.0 0.1 2,201.0 0.1
388 2 3,383.0 0.078 809.0 0.0 2,978.5 0.1 5,179.5 0.1
389 3 4,231.0 0.097 848.0 0.0 3,807.0 0.1 8,986.5 0.2

Temp Water Quality Pond Calculations 11-05-01.xis
Pond Volume Below WSEL Page 1 of 1 Printed 4/18/2002 1:54 PM
14 00?

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t

Water Quality Pond Volume Calculations
Stage-Storage Data for Forebay
Project NCSU -Central Utilities Plant
Project No. 1724-0006
Date 05-Nov-01

Contour ID
Stage
Area
[s q. ft.
Area
acres Incremental
Area
[s q. ft. Incremental
Area
acres Incremental
volume
cu. ft Incremental
volume
acre-ft Cumulative
volume
cu. ft Cumulative
volume
acre-ft
386 0 81.0 0.002 81.0 0.0 0.0 0.0 0.0 0.0
387 1 257.0 0.006 176.0 0.0 169.0 0.0 169.0 0.0
388 2 503.0 0.012 246.0 0.0 380.0 0.0 549.0 0.0
389 3 816.0 0.019 313.0 0.0 659.5 0.0 1208.5 0.0

Temp Water Quality Pond Calculations 11-05-01.xls
Forebay Stage-Storage Page 1 of 1
Printed 4/18/2002 1:54 PM
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1
1
Water Quality Basin Dewatering Time Calculations
Project NCSU - Central Utilities Plant
Project No. 1724-0006
Date 05-Nov-01
Maximum surface area of basin 5,892 square feet
Maximum head of water above dewatering hole 1.75 feet
Orifice coefficient 0.90
Diameter of each hole 1.0 inches
Number of holes 2
Cross sectional area of each hole = 0.005 square feet
Cross sectional area of each hole = 0.8 square inches
Cross sectional area of dewatering hole(s) = 0.011 square feet
Cross sectional area of dewatering hole(s) = 1.6 square inches
Dewatering time for basin = 55.0 hours
Dewatering time for basin = 2.3 days
Calculations based on NC Sediment and Erosion Control Manual
Page 8.07.8
Notes:
1. Maximum surface area is at top of WQ storage pool (elevation 390.75)
I fv
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Water Quality Pond Summary Information
Project NCSU - Central Utilities Plant
Project No. 1724-0006
Date 5-Nov-01
Drainage area to pond 199,069 square feet = 4.57 acres
Impervious area in drainage area 100,623 square feet = 2.31 acres
Bottom of pond elevation 386.00 feet
Normal pool elevation 389.00 feet
Pond volume at normal pool 8,986 cubic feet
Required volume for design rainfall 8,376 cubic feet
Required surface area for pond 4,140 square feet
Volume provided for storage of design rainfall = 8,838 cubic feet at elevation 390.75
Surface area provided at normal pool 4,231 square feet
Temp Water Quality Pond Calculations 11-05-01.xis
Summary Data Page 1 of 1

Printed 4/18/2002 1:55 PM
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Level Spreader Calculations
Q (cfs)
Flow from FES #1 = 4.75 (See storm drainage calculations)
Remaining area entering spreader = 0.35
Calculations:
Q=CIA
Q = (.40) " (7.22 in/hr) * (.12 ac)
Q = 0.35 cfs
Total flow entering level spreader = 5.10
From table 6.40a (Erosion & Sediment Control Planning and Design Manual):
Size of Level Spreader
Design Flow Entrance Width Depth End Width Length
cfs
0-10 10 0.5 3 10
10-20 16 0.6 3 20
20-30 24 0.7 3 30
From DWQ Level Spreader Design Options: 13 feet/ 1 cfs (bsed on 10-yr storm)
Length (ft) = 13 X 5.1 = 66
Z- t

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Riser Width 4
Riser Length 4
Wall Thickness 0.67
Riser Depth 5.25
Riser Inner Volume 84
Riser Concrete Volume 65.7069
Total Buoyant Force 9341.711
Concrete Weight 9856.035
Desired Factor Of Safety 1.3
Total Weight Required 12144.22
Additonal Weight Required 2288.189
Volume of Additional Concrete 33.21993 CF
Base Width 6
Base Length 6
Sheet1
Required Base Depth 0.922776 11.07331 inches
Set Depth to min 1 feet
Page 1
ZS
f. IF APPLICABLE, WHAT IS PROPOSED METHOD OF
SEWAGE DISPOSAL?
Gravity sewer from building to existing collection system
g. SIGNED AND DATED AGENT AUTHORIZATION LETTER, IF
APPLICABLE. N/A
NOTE. WETLANDS OR WATERS OF THE U.S. MAY NOT BE IMPACTED
PRIOR TO:
PERMIT,
1) ISSUANCE OF A SECTION 404 CORPS OF ENGINEERS
2) EITHER THE ISSUANCE OR A WAIVER OF A 401 DIVISION
OF
ENVIRONMENTAL MANAGEMENT (WATER QUALITY) CERTIFICATION,
AND
3) (IN THE TWENTY COASTAL COUNTIES ONLY), A LETTER
FROM THE
NORTH CAROLINA DIVISION OF COASTAL MANAGEMENT STATING
THE PROPOSED
ACTIVITY IS CONSISTENT WITH THE NORTH CAROLINA COASTAL
MANAGEMENT
PROGRAM.
OWNER' S/ ENTS SIGNATURE Date
AGENT' S SIGNATURE VALID ONLY IF AUTHORIZATION LETTER
FROM THE OWNER
IS PROVIDED (18g.)
POND MAINTENANCE REQUIREMENTS
Project Name: Cent. Campus Central Utility Plant Project Number:
Responsible Party: Facilities Operations Phone Number: 515-2967
Address: Campus Box 7536
1. Inspect monthly, or after every runoff-producing rainfall event, whichever is more frequent:
A. Remove debris from the trash rack.
B. Check and clear the orifice of any obstructions.
C. Check the pond side slopes; remove trash, repair eroded areas before the next rainfall
event.
D. Check the vegetated filter for sediment accumulation, erosion and proper operation.
Repair as necessary.
II. Quarterly
A. Inspect the collection system (i.e. catch basins, piping, grassed swales) for proper
functioning. Clear accumulated trash from catch basin grates and catch basin bottoms,
and check piping for obstructions.
B. Check pond inlet ponds for undercutting, replace riprap, and repair broken pipes.
C. Reseed grassed swales, including the vegetated filter if applicable, twice a year as
necessary. Repair eroded areas immediately.
III. Every 6 months
A. Remove accumulated sediment from the bottom of the outlet structure.
B. Check the pond depth at various points in the pond. If depth is reduced to three feet,
sediment will be removed to at least original depth of four feet.
POND MAINTENANCE REQUIREMENTS (continued)
PAGE 2
IV. General
A. Mow the side slopes, not including normally submerged vegetated shelf, according to
the season. Maximum grass height will be 6":
B. Cattails, and other indigenous wetland plants are encouraged along the pond perimeter;
however, they must be removed when they cover the entire surface area of the pond.
C. The orifice is designed to draw down the pond in 2-5 days. If draw down is not
accomplished in that time, the system may be clogged. The source of the clogging must
be found and eliminated.
D. All components of the detention pond system must be kept in good working order.
POND MAINTENANCE REQUIREMENTS (continued)
I, George Worsley, Vice Chancellor Finance and
financially responsible party for maintenance
maintenance as outlined above, as part of the
Regulations received for this project.
Business, hereby acknowledge that I am the
of this detention pond, I will perform the
Certification of Compliance with Stormwater
'?C??- O ?--
Signature Date C-?
LEVEL SPREADER AND FORESTED FILTER STRIP REQUIREMENTS
Maintenance for the a Primarily natural, woody vegetation strip includes the following:
• At least once annually, remove deposited sediment, especially from the
upstream edge, to maintain original contours and grading.
• Repair channels that form and maintain the filter strip to ensure that the runoff
flows evenly in a thin sheet above the filter strip
• Repair level spreader whose disrepair can cause the formation of channels in the
forested filter strip.
• Maintain and re-seed the filter strip as necessary to maintain a dense growth of
vegetation, especially if the strip has been used for sediment control.
• Grassed parts of the filter strips shall be mowed at least twice annually to
maximum height of six inches.
I, George Worsley, Vice Chancellor Finance and Business), hereby acknowledge that I
am the financially responsible party for maintenance of the storm water management
system. I will perform the maintenance as outlined above, as part of the Certification of
Compliance with Storm water Regulations received for this project.
Signature Date L? ?O?-
DEM ID:
*NEUSE RIVER BUFFER
REQUEST*
NATIONWIDE PERMIT REQUESTED (PROVIDE NATIONWIDE PERMIT #): NA
PRE-CONSTRUCTION NOTIFICATION APPLICATION
FOR NATIONWIDE PERMITS THAT REQUIRE:
1) NOTIFICATION TO THE CORPS OF ENGINEERS
2) APPLICATION FOR SECTION 401 CERTIFICATION
3) COORDINATION WITH THE NC DIVISION OF COASTAL MANAGEMENT
SEND THE ORIGINAL AND (1) COPY OF THIS COMPLETED FORM TO THE APPROPRIATE
FIELD OFFICE OF THE CORPS OF ENGINEERS (SEE AGENCY ADDRESSES SHEET). SEVEN
(7) COPIES SHOULD BE SENT TO THE N.C. DVISION OF WATER QUALITY (SEE AGENCY
ADDRESSES SHEET). PLEASE PRINT
1. OWNERS NAME: North Carolina State University c/o Mr. George Worsley
2. MAILING ADDRESS: Campus Box 8007
SUBDIVISION NAME: NA
CITY: Raleigh STATE: North Carolina ZIP CODE: 27695
PROJECT LOCATION ADDRESS, INCLUDING SUBDIVISION NAME (IF DIFFERENT FROM
MAILING ADDRESS ABOVE):
Centennial Campus, Main Campus Drive
3. TELEPHONE NUMBER (HOME:) NA
WORK: 919-515-6850
4. IF APPLICABLE: AGENTS NAME OR RESPONSIBLE CORPORATE OFFICIAL, ADDRESS,
PHONE NUMBER:
Mr. George Worsley
NCSU (see address above) 919-515-6850
5. LOCATION OF WORK (PROVIDE A MAP, PREFERABLY A COPY OF USGS
TOPOGRAPHIC MAP OR AERIAL PHOTOGRAPHY WITH SCALE):
COUNTY: Wake
NEAREST TOWN OR CITY: Raleigh
SPECIFIC LOCATION (INCLUDE ROAD NUMBERS, LANDMARKS,
ETC.):
On Main Campus Drive located next to Toxicology on Centennial
Campus.
6. IMPACTED OR NEAREST STREAM/RIVER: Walnut Creek
RIVER BASIN: Neuse
7a. IS THE PROJECT LOCATED NEAR WATER CLASSIFIED AS
TROUT, TIDAL
(SA), HIGH QUALITY WATERS (HQW), OUTSTANDING RESOURCE
WATERS (ORW),
WATER SUPPLY (WS-I OR WS II)? YES NO X
IF YES, EXPLAIN:
7b. IS THE PROJECT LOCATED WITHIN A NORTH CAROLINA
DIVISION OF COASTAL
MANAGEMENT AREA OF ENVIRONMENTAL CONCERN (AEC)? YES
NO X
7c. IF THE PROJECT IS LOCATED WITHIN A COASTAL COUNTY
(SEE PAGE 7 FOR
LIST OF COASTAL COUNTIES), WHAT IS THE LAND USE PLAN (LUP)
DESIGNATION?
NA
8a. HAVE ANY SECTION 404 PERMITS BEEN PREVIOUSLY
REQUESTED FOR USE ON
THIS PROPERTY? YES NO X IF YES, PROVIDE
ACTION I.D. #
OF PREVIOUS PERMIT AND ANY ADDITIONAL INFORMATION
(INCLUDE PHOTOCOPY
OF 401 CERTIFICATION):
8b. ARE ADDITIONAL PERMIT REQUESTS EXPECTED FOR THIS
PROPERTY IN THE
FUTURE? YES NO X IF YES, DESCRIBE
ANTICIPATED WORK:
9a. ESTIMATED TOTAL NUMBER OF ACRES ON TRACT OF LAND:
6.08 acres
9b. ESTIMATED TOTAL NUMBER OF ACRES OF WETLANDS
LOCATED ON PROJECT
SITE:
10a. NUMBER OF ACRES OF WETLANDS IMPACTED BY THE
PROPOSED PROJECT None
BY: FILLING: EXCAVATION:
FLOODING: OTHER:
DRAINAGE:
TOTAL ACRES TO BE IMPACTED:
10b. (1) STREAM CHANNEL TO BE IMPACTED BY THE
PROPOSED PROJECT (IF
RELOCATED, PROVIDE DISTANCE BOTH BEFORE AND AFTER
RELOCATION): N/A
LENGTH BEFORE: FT AFTER: FT
WIDTH BEFORE (based on normal high water contours): FT
WIDTH AFTER: FT
AVERAGE DEPTH BEFORE: FT AFTER: FT
(2) STREAM CHANNEL IMPACTS WILL RESULT FROM: CHECK
ALL THAT APPLY: N/A
OPEN CHANNEL RELOCATION: N/A
CHANNEL EXCAVATION: N/A
OTHER: No Stream Impacts
11. IF CONSTRUCTION OF A POND IS PROPOSED, WHAT IS THE
SIZE OF THE
WATERSHED DRAINING TO THE POND? 4.57 Ac.
12. DESCRIPTION OF PROPOSED WORK INCLUDING DISCUSSION
OF TYPE OF
MECHANICAL EQUIPMENT TO BE USED (ATTACH PLANS: 8 '/z" X
11 " DRAWINGS
ONLY): Construction of a Central Utility Plant with drives and
parking lots.
13. PURPOSE OF PROPOSED WORK: Central Utility Plant
operations.
14. STATE REASONS WHY IT IS BELIEVED THAT THIS ACTIVITY
MUST BE CARRIED
OUT IN WETLANDS. (INCLUDE ANY MEASURES TAKEN TO
MINIMIZE WETLAND
IMPACTS): N/A
15. YOU ARE REQUIRED TO CONTACT THE U.S. FISH AND
WILDLIFE SERVICE N/A
(USFWS) AND/OR NATIONAL MARINE FISHERIES SERVICE (NMFS)
(SEE AGENCY
ADDRESSES SHEET) REGARDING THE PRESENCE OF ANY
FEDERALLY LISTED OR
PROPOSED FOR LISTING ENDANGERED OR THREATENED SPECIES
OR CRITICAL
HABITAT IN THE PERMIT AREA THAT MAY BE AFFECTED BY THE
PROPOSED
PROJECT. DATE CONTACTED: N/A
(ATTACH RESPONSES FROM THESE AGENCIES.)
16. YOU ARE REQUIRED TO CONTACT THE STATE HISTORIC
PRESERVATION
OFFICER (SHPO-SEE AGENCY ADDRESSES SHEET) REGARDING THE
PRESENCE OF
HISTORIC PROPERTIES IN THE PERMIT AREA WHICH MAY BE
AFFECTED BY THE
PROPOSED PROJECT. DATE CONTACTED: N/A
17. DOES THE PROJECT INVOLVE AN EXPENDITURE OF PUBLIC
FUNDS OR THE USE
OF PUBLIC (STATE) LAND? YES X NO (IF NO,
GO TO
18)
a. IF YES, DOES THE PROJECT REQUIRE PREPARATION
OF AN ENVIRONMENTAL DOCUMENT PURSUANT TO THE
REQUIREMENTS OF THE NORTH CAROLINA ENVIRONMENTAL
POLICY ACT?
YES X NO
b. IF YES, HAS THE DOCUMENT BEEN REVIEWED
THROUGH THE NORTH
CAROLINA DEPARTMENT OF ADMINISTRATIVE STATE
CLEARINGHOUSE?
YES X NO
IF ANSWER TO 17b IS YES, THEN SUBMIT APPROPRIATE
DOCUMENTATION FROM
THE STATE CLEARINGHOUSE TO DIVISION OF ENVIRONMENTAL
MANAGEMENT
REGARDING COMPLIANCE WITH THE NORTH CAROLINA
ENVIRONMENTAL POLICY ACT.
QUESTIONS REGARDING THE STATE CLEARINGHOUSE REVIEW
PROCESS SHOULD BE
DIRECTED TO MS. CHRYS BAGGETT, DIRECTOR STATE
CLEARINGHOUSE, NORTH
CAROLINA DEPARTMENT 01= ADMINISTRATION, 116 WEST JONES
STREET, RALEIGH
NORTH CAROLINA 27603-8003, TELEPHONE [phone].
18. THE FOLLOWING ITEMS SHOULD BE INCLUDED WITH THIS
APPLICATION IF PROPOSED ACTIVITY INVOLVES THE DISCHARGE
OF EXCAVATED OR FILL MATERIAL INTO WETLANDS:
N/A
a. WETLAND DELINEATION MAP SHOWING ALL WETLANDS,
STREAMS, LAKES, AND PONDS ON THE PROPERTY (FOR NATIONWIDE
PERMIT NUMBERS 14, 18 ,21, 26, 29, AND 38). ALL STREAMS
(INTERMITTENT AND PERMANENT) ON THE PROPERTY MUST BE
SHOWN ON THE MAP. MAP SCALES SHOULD BE 1 INCH EQUALS 100
FEET OF THEIR EQUIVALENT.
b. IF AVAILABLE, REPRESENTATIVE PHOTOGRAPH OF
WETLANDS TO BE IMPACTED BY PROJECT.
c. IF DELINEATION WAS PERFORMED BY A CONSULTANT,
INCLUDE ALL DATA SHEETS RELEVANT TO THE PLACEMENT OF
THE DELINEATION LINE.
d. ATTACH A COPY OF THE STORMWATER
MANAGEMENT PLAN IF REQUIRED.
e. WHAT IS LAND USE OF SURROUNDING PROPERTY?
Currently the properties on the north and east side of the site are
undeveloped. The property on the west side is being used for
educational purposes (Toxicolgy).
r
CJ b
APPROVAL of Neuse River Buffer Rules
NCSIJ
c/o fir. George Wor'sley
Campus Box 8007
Raleigh, NC 27695
Dear Mr. Mr, Worsley:
Michael F. Easley
Governor
William G. Ross, Jr., Secretary
Department of Environment and Natural Resources
Alan W. Klimek, P.E. Director
Division of Water Quality
June 5, 2002
NCSU Utility Plant
Wake County
DWQ Project # 020821.
You have our approval, in accordance with the attached conditions, to discharge storm water through the buffer as you described in
your application dated April 26, 2002.
this approv,31 is only valid for the purpose and design that you described in your application. If you change your protect, you must
notify us and send us a new application. If the property is sold, the new owner must be given a copy of the approval letter and is thereby
responsible for complying with all conditions.
If you do rot accept any of the conditions of this approval, you may ask for an adjudicatory hearing. You must act within 60 days of
the date that you roceive this letter. 'To ask for a hearing, send a written petition, which conforms to Chahier 15C13 of the North Caro!ina
General Statutes to the Office of Administrative Hearings, P.O. Box 27447, Raleigh, N.C 27611-744-17. This; approval and its conditions
are final arid binding unless you ask for a hearing.
if you have any questions please telephone Bob Zarzecki at 919-733-9646.
Sincerely,
cc: Raleigh DWC] Rogionai Office
File Copy
Central Files
Alan Klimek, PE
North Carolina Division of Water Ouality. 401 Wetlands Certification Unit,
1650 Mail Service Center, Raleigh, NC 27699-1650 (Mailing Address)
2321 Crabtree Blvd., Raleigh, NC 27604-2260 (Location)
919-733-1786 (phone), 915-733-6893 (fax), http://h2o.enr.state.nc.us/ncwetlands/
Project Name: Avera Place
Project No. DWQ 010907
SUBMITTED DESIGN: REQUIRED DESIGN:
elevations 2.1 average depth status
Bottom of Basin (ft) 386
Permanent Pool (ft) 389 3 ft_ depth ok
Temporary Pool (ft) 390.75 1.75 ft. depth ok
areas
Permanent Pool SA (sq ft) 4231 4138 sq. ft. ok
Drainage Area (ac) 4.57
Impervious Area (ac) 2.31 50.5 % -

volumes
Permanent Pool (cu ft) 8986
Temporary Pool (cu ft) 8838 8376 cu. ft. ok
Forebay (cu ft) #VALUE! % #VALUE!

other parameters
SA/DA 0 2.08 -
Orifice Diameter (in) 1 0.02 cfs drawdown -
Design Rainfall (in) 1 4.2 day drawdown ok
Linear Interpolation of Correct SA/DA ***
Ck Impervious
Next Lowest 50
Project Impervious 50.5
Next Highest 60
3 ft. Permanent Pool Depth
SA/DA from Table
2.06
2.08
2.4
?MCIQM&CREED
1111101.
April 26, 2002
M&C 01724-000610)
MAY 1
4401 Reedy Creek Rd.
Raleigh, NC 27607 ?
WEt1 A,NdS . G? „ K?rjp_..__;
Wf;lC;; U'Cl1y SLul;
RE: NCSU Centennial Campus- Proposed Central Utility Plan #er Permit
Mr. Todd St. John
NCDENR-Division of Water Quality
Dear Mr. St. John:
Enclosed are the stormwater plans, detail sheets, narrative, and supporting calculations for the
proposed Central Utility Plant project at NCSU's Centennial Campus in Raleigh, NC. This project
is not for a 401 Review and therefore will not require a permit fee. This project is only for a Neuse
River Buffer review. I have discussed the project with both you and Marc Rectenweld of NCSU
Stormwater Division. This project is being submitted to your agency on behalf of NCSU.
We look forward to hearing back from you in the near future. Thank you very much.
Sincerely,
McKIM & CREED, P.A.
4 L---
Mark M grath, PE
Project Manager
Enclosures
/der
s:\V24\0006\10-Comm\04262St.&".S.DILLARD DR., SUITE 117, CARY, NORTH CAROLINA 27511
TEL [phone] FAX [phone] www.mckimcreed.com
? -110 -1
Project No. DWQ (to be provided by DWQ)
DIVISION OF WATER QUALITY - 401 WET DETENTION BASIN WORKSHEET
DWQ Stormwater Management Plan Review:
A complete stormwater management plan submittal includes a wet detention basin worksheet for each basin,
design calculations, plans and specifications showing all basin and outlet structure details, and a fully executed
operation and maintenance agreement. An incomplete submittal package will result in a request for additional
information and will substantially delay final review and approval of the project.
I. PROJECT INFORMATION (please complete the following information):
Project Name : NCSU Centennial Campus - Central Utility Plant
Contact Person: Mark J. Magrath, P.E. Phone Number: ( 919 ) 233-8091
For projects with multiple basins, specify which basin this worksheet applies to:Only One Basin Present
Basin Bottom Elevation 386.00 fit.
Permanent Pool Elevation 389.00 ft.
Temporary Pool Elevation 390.75 ft.

Permanent Pool Surface Area 4,231 sq. ft. (water surface area at permanent pool elevation)
Drainage Area 4.57 ac. (on-site and off-site drainage to the basin)
Impervious Area 2.31 ac. (on-site and off-site drainage to the basin)

Permanent Pool Volume 10,194 cu. ft. (combined vole ne of main basin and forebay)
Temporary Pool Volume 8,838 cu. ft. (volume detained on top of the permanent pool)
Forebay Volume 1,208 cu. ft.

SA/DA used 2.1 (surface area to drainage area ratio)
Diameter of Orifice 1 in. (draw down orifice diameter)
II. REQUIRED ITEMS CHECKLIST
The following checklist outlines design requirements per the Stormwater Best Management Practices manual
(N.C. Department of Environment, Health and Natural Resources, November 1995) and Administrative Code
Section: 15 A NCAC 2H .1008. Initial in the space provided to indicate the following design requirements have
been met and supporting documentation is attached. ff a requirement has not been met, attach an explanation of
why.
Applicants Initials
1144 The temporary pool controls runoff from the I inch storm event.
The basin length to width ratio is greater than 3:1.
M I The basin side slopes are no steeper than 3:1.
Im 2- A submerged and vegetated perimeter shelf at less than 6:1 is provided.
A Vegetation to the permanent pool elevation is specified.
An emergency drain is provided to drain the basin.
The permanent pool depth is between 3 and 6 feet (required mininu.un of 3 feet).
The temporary pool draws down in 2 to 5 days.
The forebay volume is approximately equal to 20% of the total basin volume.
Sediment storage is provided in the permanent pool.
Mk Access is provided for maintenance.
Pi A minimum 30-foot vegetative filter is provided at the outlet.
4A k A site specific operation and maintenance (O&M) plan is provided.
Alf, A vegetation management/mowing schedule is provided in the O&M plan.
MC Semi-annual inspections are specified in the O&M plan.
A debris check is specified in the O&M plan to be performed after every storm event.
Ilht2 A specific sediment clean-out benchmark is listed (elevation or depth) in O&M plan.
thfC A responsible party is designated in the O&M plan.
FORM SWG100 09/97 Page 1 of 1
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