20051887 Ver 1_Complete File_20050919

FR Michael F. Easley, Governor
r
William G. Ross Jr., Secretary
North Carolina Department of Environment and Natural Resources
p .? Alan W. Klimek, P.E. Director
Division of Water Quality
October 17, 2005
DWQ Project # 2051887
Lenoir County
Mr. Jon Hathaway
Extension Associate
Water Quality Group
Department of Biological and Agricultural Engineering
North Carolina State University
P.O. Box 7625
Raleigh, NC 27695-7625
Subject Property: Kinston porous pavement research project
Public Service Complex, Kinston, NC
APPROVAL of activity that is exempt from the Neuse River Buffer Rule (15A NCAC 02B.0233)
Authorization Certificate
Dear Mr. Hathaway:
You have our approval, in accordance with 15A NCAC 02B .0233, to direct stormwater through the
protected riparian buffers for the purpose of constructing the study site for pervious pavement at the
Public Service Complex in Kinston, NC at the subject property as described within your application dated
September 1, 2005 (received by DWQ on September 19, 2005). In addition, you should obtain or
otherwise comply with any other required federal, state or local permits before you go ahead with your
project including (but not limited to) Erosion and Sediment Control, Non-discharge regulations. As
described in the Neuse River Buffer rules, scientific studies are exempt from the Buffer rules. This letter
confirms that exemption.
This approval is for the purpose and design that you described in your application. If you change your
project, you must notify us and you may be required to send us a new application. If the property is sold,
the new owner must be given a copy of this authorization and approval letter and is thereby responsible
for complying with all conditions. This approval requires you to follow the conditions listed below.
The Additional Conditions of the Certification are:
1. Certificate of Completion
Upon completion of all work approved within this authorization, and any subsequent
modifications, the applicant is required to return the attached certificate of completion to the 401
Oversight/Express Review Permitting Unit, North Carolina Division of Water Quality, 1650 Mail
Service Center, Raleigh, NC, 27699-1650.
Any disputes over determinations regarding this Authorization Certificate (associated with the approved
buffer impacts) shall be referred in writing to the Director for a decision. The Director's decision is
Non` hCarolina
401 Oversight/Express Review Permitting Unit Nlitrally
1650 Mail Service Center, Raleigh, North Carolina 27699-1650
2321 Crabtree Boulevard, Suite 250, Raleigh, North Carolina 27604
Phone: [phone] / FAX [phone] / Internet: httv://h2o.enr.state.ne.us/ncwetlands
An Equal Opportunity/Affirmative Action Employer- 50% Recycled/l0% Post Consumer Paper
Mr. Jon Hathaway
Page 2 of 2
October 14, 2005
subject to review as provided in Articles 3 and 4 of G.S. 150B. This Authorization Certificate shall
expire five (5) years from the date of this letter.
This letter completes the review of the "No Practical Alternatives" determination under 15A NCAC 213
.0233. If you have any questions or would like a copy of the buffer rules, please call [phone].
This letter does not authorize any impacts to either Waters of the United States or Waters of the State.
Please contact the US Army Corps of Engineers (USACE) or NC Division of Water Quality (DWQ) if
any impacts are proposed to either of these waters.
Sincerely,
AWK/jrd
Enclosures: Coastal General Variance
Certificate of Completion
cc: Kyle Barnes, DWQ Washington Regional Office
DLR Washington Regional Office
File Copy
Central Files
/ ' 1, I -0,_.,??
W. Klimek,°P.E.
Filename:
Oct'15 05 12:56p NCSU BRE 919-515-6772 P•1
North Caro'ina State University is a land- Department of Biological and
grant university and a ccnstituent insti%ticn Agricultural Engineering
of The Uaiversity of North Carolina
Box. 7625
Raleigh, NC 27695-7625
919,515.2675
919.515.6772 (fax)
FAX TRANSMITTAL SHEET
TO:
FAX 9: ;? 6%q]
FRObI: OI11 0? 0. q
DATE: (O (?? .
Number of ?ages, including the coversheet:
COMMENTS:
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OCT-15-2005 SAT 00:50 TEL:[phone] NAME:DWQ-WETLANDS P. 1
Oct'#15 05 12:56p NCSU BRE 919-515-6772 p•2
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lull. John Dorney
N.C. Division of Water Quality
2321 Crabtree Blvd
Raleigh, NC 27601
Mr. Dorney,
Department of Biological and
Agricultural Engineering
Box 7525
Raleigh, NC 27695-7625
919.515.2575
919.515.5772 (fax)
September 1, 2005
Enclosed is a description of a scientific research project that will be taking place in
Kinston. N.C. at the Public Service Complex. This project involves the construction of a
new 76CO ft2 (0.2 acre) parking lot at the City of Kinston Public Services Complex, and is
funded by an EPA-319 grant as Nvell as a grant from the Interlocking Concrete Pavement
Institute. This parking lct will consist of 5 types of pavement, one being standard asphalt
and 4 of them being pervious pavements. More than 6010 of the proposed parking lot will
be pervious. The purpose of this study is to determine how well pervious pavement;
reduce l7eak flow and pollutant loads when compared to standard asphalt.
As part of this study, stormwater that runs off of all 5 pavement types, as well as
stormwater that infiltrates into the 4 pervious pavement types, will be captured and
monitored. This stormwater will then be sent, via a 12 inch pipe, into a nearby tributary
to the Neuse River. Because the majority of the stormwater will be treated by the
permeable pavement, and because this project will be constructed as part of a scientific.
study by North Carolina State University, I ask that an exception to the Neuse River
Buffer Rules be made.
If further information about this study or request is needed, please feel free to contact rne.
T ank Y u,
V
Jot Hathaway
x ension Associate
[phone]
[e-mail]
OCT-15-2005 SAT 00:51 TEL:[phone] PIANE:DWQ-WETLANDS P. 2
Mr. John Domey
N.C. Division of Water Quality
2321 Crabtree Blvd
Raleigh, NC 27604
Mr. Dorney,
910
September 1, 2005
Enclosed is a description of a scientific research project that will be taking place in
Kinston, N.C. at the Public Service Complex. This project involves the construction of a
new 7600 ft` (0.2 acre) parking lot at the City of Kinston Public Services Complex, and is
funded by an EPA-319 grant as well as a grant from the Interlocking Concrete Pavement
Institute. This parking lot will consist of 5 types of pavement, one being standard asphalt
and 4 of them being pervious pavements. More than 60% of the proposed parking lot will
be pervious. The purpose of this study is to determine how well pervious pavements
reduce peak flow and pollutant loads when compared to standard asphalt.
As part of this study, stormwater that runs off of all 5 pavement types, as well as
stormwater that infiltrates into the 4 pervious pavement types, will be captured and
monitored. This stormwater will then be sent, via a 12 inch pipe, into a nearby tributary
to the Neuse River. Because the majority of the stormwater will be treated by the
permeable pavement, and because this project will be constructed as part of a scientific
study by North Carolina State University, I ask that an exception to the Neuse River
Buffer Rules be made.
If further information about this study or request is needed, please feel free to contact me.
Thank You,
Jon Hathaway
LIM
9 2005
Extension Associate
[phone]
[e-mail]
J C `LITy

Introduction and Background
The Biological and Agricultural Engineering Department at North Carolina State
University has secured an EPA-319 grant as well as a grant from the Interlocking
Concrete Pavement Institute to perform research on permeable pavement in the Neuse
River Basin. A site has been selected at the City of Kinston Public Services Complex in
Kinston, North Carolina (See Figures La and Lb). This site is adjacent to an unnamed
tributary to the Neuse River. At this location, a 7600 ft2 (0.2) acre parking lot will be
constructed. More than 60% of the parking lot surface area will consist of permeable
pavements.
ite

The runoff from 95% of the surface area of the parking lot will be captured as part of the
experiment prior to its release into the surrounding surface waters. The remaining 5%
will surface flow into the existing stormwater conveyance system.
Proposed Research
The parking lot will be constructed using various types of pavement. Permeable
interlocking concrete pavers (PICP) filled with sand, PICP filled with stone, concrete grid
pavers filled with sand, pervious concrete, and standard asphalt will be used in the
parking lot design. The various surfaces will be hydrologically separated and will
experience similar traffic (See Figure 2). Underdrains will be installed below each section
of permeable pavement. These underdrains will be used to collect the permeable
pavement exfiltrate and route it to a weir box where flow can be quantified and water
quality samples can be taken. Additionally, runoff occurring from each pavement section
will be collected in a gutter and quantified. All the runoff and exfiltrate that is captured
will be routed to one location before draining to a nearby unnamed tributary via a 12"
pipe.
The flow data will be analyzed to determine how well each type of permeable pavement
reduces runoff. Also, water quality data will be analyzed to determine how permeable
Figure La and Lb: Location of Proposed Permeable Pavement Study
pavement exfiltrate compares to runoff from standard asphalt, and if permeable pavement
type has an impact on exfiltrate quality. Statistical analysis will be used to determine the
following: (1) If there is a significant difference among the pavement types and asphalt
with respect to concentrations of various pollutants including TP, TSS, TN (2) Determine
the statistically significant (p < 0.05) minimum percent reduction in concentration and
loads for the above pollutants (3) Determine the average pollutant removal effectiveness
for each of the treatments compared to asphalt, this latter objective is not a statistically
significant result.
As a result of this study, the state of North Carolina will be able to make an informed
judgment on how much pollutant removal credit permeable pavements should receive
when implemented as stormwater best management practices. Additionally, this study
can be used to determine if stormwater credit should be given out uniformly to permeable
pavements, or if it should vary based on pavement type.
Pavement Sections
i
Flow Barriers
t
l
Existing Road
Figure 2: Permeable Pavement Study Design
Justification
The soils located at the site are not suitable for implementing a permeable pavement
design without the use of underdrains. Additionally, the use of underdrains will enhance
the study by allowing permeable pavement exfiltrate quantity and quality to be
monitored. In order to perform the desired monitoring on the system, the flow must be
quantified below the ground surface where the underdrains are located. After the desired
measurements have been taken, positive drainage is required to remove the stormwater
from the sampling facility. It will therefore not be feasible to bring the water back to the
ground surface or to provide diffuse flow through the riparian buffer. Because the
majority of the stormwater will be treated by the permeable pavement, and because this
project will be constructed as part of a scientific study by North Carolina State
University, I ask that an exception to the Neuse River Buffer Rules be made (Rule .0242).
32" P.C.P
Invert 95.00'
Parking Lot
Conservation Easement (buffer) ` • • • • • ` • ` + ? s ? • _ Landscaped
• ? . . , . + -? Area
.........
...........
-? -? .?--? . . . . . . • . . . • . . • • • , • , • Concrete WaI way
r, -s . • • • . ? • ? + ? • ` ` + ' • ' • ' Concrete Pad for Flag Pole
_ . ?`?t"` . + i . . • • i . • , + ? . . , • . . . . f i Pe?n4eafjle P +nTef?•5
t.;?V">r?"`-r ?.? • . . + , • • . . . ? . • • • • • • ? • • I - •-?' _ -1 Parking Lot
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U.S. DEPARTMENT OF THE INTERIOR
U.S. GEOLOGICAL SURVEY
STATE OF NORTH CAROLINA
DEPARTMENT OF ENVIRONMENT AND NATURAL RESOURCES
K` I DIVISION OF LAND RESOURCES
J NORTH CAROLINA GEOLOGICAL SURVEY