20000900 Ver 1_Major Variance_20000712

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Water Quality COmmitt~
July 12, 2000
Neuse River Basin: Nutrient Sensitive Waters Management Strategy
Protection and Maintenance of Riparian Areas Rule (15A NCAC .0233)

Owner: Architect: Civil Engineer:
John Adams Michael Nicklas Mac McIntyre
3025 Westbury Dr. Innovative Design, Inc. Parquer & Associates
Raleigh, NC 27606 850 West Morgan Street 4926 Windy Hill Dr.
919.781.8826 (P) Raleigh, NC 27603 Raleigh, NC 27609
919.788.9301 (F) 919.832.6303 (P) 919.876.7778 (P)
919.832.3339 (F) 919.876.6678 (F)
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' Innovative Design, Inc.

~~„~^ment of _nvironment and Natural Resources
t Civision cf `; :ter Quality
~ Variance Request Form
Neuse River Basin: Nutrient Sensitive Waters Management Strategy
' Protection and Maintenance of Riparian Areas Rule (15A NCAC .0233)
NOTc: Tnis form maybe pnotcccpied for use as an orginal.
Part 1: General Information
' 1. Applicant's name (the ccrperation, individual, etc. who owns the project):
John R. Adams
' ~. P^r,t Owner/Signing ~ffc;ai !person legally respcnsib'~ =cr the facilit'~ and its compliance)
Name: John R. Adams
' Title: Owner
Street address: 3025 Westbury Dr.
City, State, Zip: Raleigh, NC 27606
Telephone: -919 781.8826
Fax: 1919 ;788.9301
3. rroject Name (Subdivisicn, facility, or establishment name - c;,nsistent with project name en
plays, specifications, letters, operation and maintenance agreements, etc.):
Hilburn Dr. Congregate Care

4. Location of Facilit`~
Street address:
City, State, Zip:
County
Latitudeilongitude:
7400 Hilburn Dr.
Raleigh, NC 27613

Wake
78°-42-53 W / 35°-52-42 N
5 Directions to facilirj `rpm nearest major intersection (Aso at`ach a map):
From intersection of I-440 (Beltline) W on US 70. North on Hilburn Pr
across from Raleigh Memorial Gardens. Site is approximately 1/2 mile
nor~i of intersection of Hilburn Dr. & Lynn Rd. on west side o£
urn r.
' o. Contact person who pan answer questions about .he `ac,lit~,i
Narne: `iichael Nickles or Louis Gerics
Telepncne: 919 832.6303
' r=ax: 919 :832.3339
Email innovativedesign!~mindsprir~. core
7 Requested Environmental ,titaragement Commissicn Hearing Cute: July 12, 2000

' V er J~0r1 ~ Je~~e(~r'ier I ~.`.~

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Part 2: Demonstration of Need for a Variance
NOTE: The variance provision of the Neuse Riparian Area .Rule allows the ~nvirnnmental Management
Commission to grant a variance to an affected party when the following conditions apply on a given project:
(a) practical difficulties or hardships 'would result from strct application of the rule:
(b) such difficulties or hardships result from condition which are peculiar to the propertty involved; and
(c) the general purpose and intent of the Rule would be preserved, water quality would be protected and
substantial justice would be done if the variance were granted.
This part of the application is to explain how the project meets criteria (a) and (b).
Attach a detailed description (2-3 pages) explaining the following:
• The practical difficulties or hardships that would result from strict application of the Rule.
• How these difficulties or hardships result from conditions that are unique to the property
involved.
• ~f/hy reconfiguring and/or reducing the built-upon area to preserve a greater portion of the
riparian area is not feasible on this project. If economic hardship is the major
consideration, then include a specific explanation of the economic hardship and the
proportion of the hardship to the entire value of the project.
Part 3: Water Quality Protection
'VOTE: This part of the application is to explain how the project meet c,~ter;on ;c): the genera! purpose and
intent of the ,Rule would be preserved, water qualir~ would be protected and substantial justice would be done if
the variance were granted.
Briefly summarize how water qualit`~ will be pretested on this project. Also attach a detailed
narrative (1-2 pages) describing the nonstructural and structural measures that will be used
for protecting water qualit`~ and reducing nitrogen inputs to surface water.
A extended detention wetland will mitigate the run off from new impervious
surfaces. It will be two and one half times the required area. The
existing outlet from storm sewers will be re-routed through a new Swale.
itiona y, we wi incorporate a a vance solar energy collection
system to displace up to 133 pounds of atmospheric nitrogen.
2. V~Jhat is the total project area in acres? .92
3. Which of the following permits/approvals will be requlrec for this project?
CAMA ~ylajor
x Sediment/`rosion Control
x 401 Certincadcn/404 Permit
Vanarce Request =orm, page 2
Vernon 1 September 19?8

tart 3: vvaier ~cua!!~y r!v«ci,~!!, I.CJllllllUCU
4. Complete the following infermation for each drainage basin. If there are more than two
drainage basins in the project, attach an additional sheet with the information for each basin
provided in the same format as below.

Project Information ~ Drainage Basin 1 Drainage Basin 2
Receiving stream name Unnamed tributary to ~urkey Creek
Receiving stream class' ~B NSW
Drainage basin area (total2) X5.83 acres
Existing impervicus area (tctai`) 11.06 acres
Proposed imoer~ieus area' (total`) ~l. 1 acres
"o Impervious area (cn-site) ;6.00 7
°'o Impervicus area (totai2) (24. 19~
Impervious area' ! Drainage basin 1 ~ Drainage basin 2
On-site buildings ! .187 acres ~
On-site streets ~ N/A ~ ~
On-site parking ~ .105 acres
On-site sidewalks ~ .015 acres
Other on-site .002 acres

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The intemetsite torthrs mrormatron ~s htip://nZO.enr.state.nc.us/strmclass/alpha/neu.h[m!
' z Tolal means on-site plus off-site area that drains through the project.
3 Impervious area is defrned as the built-upcn area including, but not limited to, buildings, paring areas,
sidewalks, grave! areas, etc.
5. How was the off-site impervious area listed above derived?
Raleigh Planning Department man, project site plan and adjacent apartments
site p an

d. What will be the annual nitrogen load contrbuted by this site after development in pounds per
acre per year without structural B~~~1°s (stcrmwater pond, wetland, infiltration basin, etc)?
Attach a detailed plan for all proposed stn:ctural stcrmwater BMPs.
Drainage ~ Size of I Post-development 1 8~y1P nitrogen Final nitrogen Final nitrogen
basin i drainage i nitrogen loading race ~ removal loading rate loading from
i basin 1 without BMPs' effrciencys I (Ibsrac,!yr) drainage basin
i ~ (ac) ~ (Ibs/ac/yr) (°~) I ~ (lbs)
' 1 I .92 8.55 40 15.13 ~_ 4_1',
Variance Request ,.=cry. pale
Version 1 Sa~ter~cer'093

HrtaCn Ca/CUlatlCns anc rererences.
s
Attach calculations and re,`erer,ces.

' By your signature in Part 7 of this application, you certify that all structural stormwater best
management practices required by this variance shall be Iccated in recorded stormwater
easements, that the easements will run with the land, that the easements cannot be changed or
deleted without concun'ence from the State, and that the easements will be recorded prior to the
sale of any lot.
'
6: A ent Authorization
Part g
If you wish to designate submittal authority to another individual or firm so that they may provide
information on your behalf, please complete this section:
' Designated agent (individual or firm): Innovatice Design, Inc .
Mailing address: 850 w. Morgan St.
City, State, Zip: Raleigh, NC 27603
' Telechone: 919.832.6303
Fax: [phone]
Small: innovativedesign@mindspring. com

' Part 7: Applicant's Certification
I, John R. Adams (print or type name of person
listed in Part I, Item 2), certif`j that the information included on this permit application form is
correct, that the project will be construe;ed in ccntcrmance with the approved plans and that the
deed restrictions in accordance ~.vith Pa. ~ 5 of ;his form will be recorded with all required permit
' conditions.
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Signature: '~~~! ~ ----
Date: - ~ ~_ ~.-1 i~iG .~ ~ ~' ~''?!>
Title: ~-%' ~'w, .-_l z

Variance Reques' r=crm, pale 5
Version 1 Se~temoer ' 998

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Part 3: Water Quality Protection, continLed
7. The applicable supplemental form(s) listed below must be attached for each BMP specified:
Form SWU-102 Wet Detention Basin Supplement
Form SWU-103 Infiltration Basin Supplement
Form SWU-105 Curb Outlet System Supplement
Form SWU-106 Off-Site System Supplement
Form SWU-107 Underground Infiltration Trench Supplement
Form SWU-109 Innovative BMPs Supplement
Part 4: Submittal Checklist
~ complete appplication submittal consists of the following components. Incomplete submittals
will be returned to the applicant. The complete variance request submittal must be received 90
days prior to the E~1C meeting at which you wish the request to be heard. Initial below to
indicate that the necessary information has been provided.
Applicant's
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• Orginal and rivo conies of ~^e Varance Request Form and the attachments
listed below.
• ~ vicinity map of the project (see Part 1, Item 5)
• Narrative demonstra±icn of `he need for a variance (see Part 2)
• A detailed narrative description cf stcrmwater treatmentJmanagement (see Part
3, Item 1)
• Calculations supporting nitrogen loading estimates (see Part 3, Item 6)
• Calculations and references supporting nitrogen removal from proposed BMPs
(see Part 3, Item 6)
• Location and details for all proposed stn ctural stormwater BMPs (see Part 3,
Item 6)
• T;nree conies of the applicable Supplement Form(s) far each BMP andlor
narrative for each innovative B1~1P (see Part 3, Item 7)
• T~^ree c:.pies of plans and scecincaticns, including:
> Develcpment/Project name
~ Engineer and firm
Legend and north arrow
i Scale (1" = 1C0' or 1" = 50' is preferred)
> Revision number ~ date
J Mean high water line (if apclicable)
Dimensioned proper~y/project boundary
Location man with named streets or NC State Road numbers
J Original contours, proposed contours, spot elevations, finished floor
elevations
Cetails of roads. parking, cul-de-sacs, side:valks, and curb and gutter
> Footprint of any proposed buildings or ether structures
J '~ti`etlands delineated, or a note on plans that none exist
J Existing drainage ;including off-site), drainage easements, pipe sizes, runoff
calculations
Drainage basins delineated
Perennial and rter~ ~ ~ittent streams. ponds, lakes, rivers and estuaries
Location or forest Sege±ation along the streams, ponds, lakes, rivers and
es~uares
/ananc2 Request =orm, ,page a
iersicn , c~ em~e age

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Variance Request Form
Neuse River Basin: Nutrient Sensitive Waters Management Strategy
Protection and Maintenance of Riparian Areas Rule (15A NCAC .0233)
' Part 2: Demonstration of a need for a Variance
Strict application of the Rule would result in a lot that would not be able to support the intended
' project and would deprive the owner of profits from building and operating the proposed
facility. The intended use of the property is a congregate care facility. The City of Raleigh
promotes such projects by allowing residential densities to be doubled for adherence to
' planning guidelines for such facilities.
The land is currently zoned R-10. The project is designed for 18 units of elderly housing. If the
' variance is not granted, there would be no room on the site for any of the common indoor
facilities required by the City of Raleigh for a congregate care center to be built and there could
be, at most, only three units. The only other foreseeable use of the property would be for a
single detached residence.
The site is small, only .92 acres. It is from 355 to 412 feet long in the north south direction and
from 88 to 130 feet wide. Zoning setbacks require 26 feet of the width. A unnamed perennial
creek running from the north east corner of the lot in a southwesterly direction to a point
approximately dividing the west property line in half crosses the lot. Additionally, an
intermittent stream bisects the area of the lot south of the perennial stream. The intermittent
stream flows into the unnamed perennial stream, which ultimately flows into Turkey Creek.
The intermittent stream has been ruled a regulated, brown line stream, subject to buffer rules.
Steve Mitchell and Bob Zarzecki of the Division of Water Quality, NC Department of
Environment and Natural Resources have inspected the site. The intermittent stream is the
source of our hardship. The buffers presented by the perennial stream leave just enough room
to build the project with only a minor variance required to build the driveway to the building
through the Zone 2 buffer.
' The buffers for the intermittent stream consume the majority of the lot outside of the perennial
stream buffer. Please see the attached site plan for the proposed building footprint and
riparian buffers.

L'

We also feel that the intermittent stream is more of a contributor of nitrogen to the Neuse River
than our proposed project and nitrogen mitigation solution would ever be. The stream is now
but a small remnant of the original channel. It is now, for all intents and purposes, only an
ouffall channel for storm drain catch basins located on Hilburn Dr. The thirty inch concrete
pipe that feeds the stream drains over three and one half acres. The channel only has water
flowing when rainwater washes over the off site drainage area, over Hilburn Dr. and empties
directly into the perennial stream. Our proposed design would greatly decrease the rate of the
discharge and give the water some chance to perk into the ground, instead of being channeled
directly into the river system.
We would also like to point out that the City of Raleigh allowed the property map to be
recorded in June 1998 without requiring the intermittent stream to be recorded as Neuse River
buffer. The stream still does not appear on the City of Raleigh Planning Department property
maps as of today (please see the attached map). It is our understanding that the State has
relegated buffer enforcement to the City of Raleigh. We feel that if the City of Raleigh did not
Innovative Design, Inc. July 12, 2000

Variance Request Form
Neuse River Basin: Nutrient Sensitive Waters Management Strategy
Protection and Maintenance of Riparian Areas Rule (15A NCAC .0233)
record the buffers on the intermittent stream the Commission look upon this as additional
reason to grant us this variance.
Furthermore, as a consequence of the City not requiring the intermittent stream to be
recorded, the owner and design team substantially completed plans for the project under the
impression the stream was not regulated as river buffer (please see attached plans). The
surveyor had noted the buffers on the perennial stream, as required by the City of Raleigh, for
recording the lot, but not buffers on the intermittent stream. We began the design work in
December 1999, in good faith, believing the stream was not regulated. We did not learn the
' stream was potentially regulated until May 22, 2000 during a meeting with Bob Zarzecki to
review our driveway crossing. He and Steve Mitchell confirmed the stream was regulated in
their site inspections of May 26 and 30, 2000. We would like to ask the Commission to take
our good faith efforts and the owner's substantial expense for design fees under consideration.
We also feel that depriving the owner of the use of his land would have an economic impact.
The current value of the land is approximately $80,000. Our estimates of the cost of building
and operating the congregate care facility show a monthly profit of approximately $6,000 or
$72,000 annually. The owner could recoup the cost of his land in just over a year and be
making profit on the land cost after that for many years if the variance is granted. We feel that
the strict adherence to the rule would deprive the owner of that long-term income.

Finally, we would like the Commission to take under consideration the very lengthy approval
process the parent tract of land went through that has brought us to this point. The site in
question was once part of a larger tract of land. That tract of land was developed into an
apartment complex and shopping center. In order to increase the density of the apartment
complex, the developers were required to apply for a special use permit form the City of
Raleigh Planning Commission. The application was made February 1, 1996. After numerous
requests for revisions by the city, the permit was granted August 12, 1997, over eighteen
months after applying for the permit. The approved site plan was submitted to the City July 23,
1997; one day after the Neuse River buffer rules took effect. One condition of approval was
that the property map be recorded within one year. It was recorded in June 1998. By that
point in time, the apartment developer had decided the small tract was not needed for their
project and the land reverted to Mr. Adams' ownership. We would like the Commission to
consider that, had the City not taken a very lengthy amount of time to approve the permit, the
recording of the site would, in all probability, not be an issue now. The Division of Water
Quality could be in a position to support our request for a variance had the City not taken
eighteen months to approve the special use permit.
Innovative Design, Inc. July 12, 2000
r

' Variance Request Form
Neuse River Basin: Nutrient Sensitive Waters Management Strategy
' Protection and Maintenance of Riparian Areas Rule (15A NCAC .0233)
Part 3: Water Quality Protection
Structural Measures
' The structural measures we are employing on our site consist of rerouting the existing
storm drain and adding an extended detention wetland to treat the water from all new
t impervious surfaces.
The existing storm drain currently empties directly into the intermittent stream, which
flows into the perpetual creek. It currently drains approximately 3.88 acres. The
proposed drain empties into a swale. The swale will flow approximately ninety feet over
managed vegetation before returning to the intermittent stream.
r The extended detention wetland will treat all water coming off all new impervious
surfaces. The area of new impervious surface is .35 acres. We are required by regulation
' to have 635 square feet of extended detention wetland on our site. We have 1,708
square feet of extended detention wetland on our site. The 635 square feet is required
for 40% nitrogen removal efficiency. This is 2.89 pounds of nitrogen per year removed
' by the extended detention wetland, or, conversely, 4.72 pounds of nitrogen allowed to
reach the Neuse River from our site. At over two and one half times the required
wetland, we should, theoretically, achieve close to nitrogen free discharge into the Neuse
River system from our new impervious surfaces. The total unmitigated nitrogen load from
the basin draining over our land is 33.5 pounds per year.
' The extended detention wetland is to comply with specifications of the NC Department of
Environment and Natural Resources. Todd St. John, a water quality engineer with the
Division of Water Quality has reviewed the design of both the new storm drain and the
1 extended detention wetland.
Non Structural Measures
The Hilburn Dr. Congregate Care center will employ an advanced solar energy collection
system. The heat collected by the solar system will be used to provide for the domestic
hot water and space heating needs of the building. The solar system will also contribute
heat used by an advanced absorption chiller for air conditioning.
The use of the solar system will replace using electricity to run this equipment and make
the domestic hot water. The solar system will contribute the annual equivalent of 86,708
kWh of energy. The amount of nitrogen oxide emitted into the atmosphere to produce
' one kWh of electricity is .005 pounds. To make 86,708 kWh emits 433.54 pounds of
nitrogen oxide. If we assume that the nitrogen component is one-third of nitrogen oxide,
1 we will be avoiding up to 144.42 pounds of nitrogen per year being emitted into the
atmosphere that will fall to earth in the rain cycle. This is 141 .53 pounds more than the
' Innovative Design, Inc. July
12, 2000

Variance Request Form
Neuse River Basin: Nutrient Sensitive Waters Management Strategy
Protection and Maintenance of Riparian Areas Rule (15A NCAC .0233)
' 2.89 pounds of nitrogen we are required to remove, or 49.97 times the amount removed
by the required 635 square feet extended detention wetland.
' Additionally, the site will remain forested in the Zone 1 buffer, except where the wetland
and a walking path will be built.
We understand that the intent of the Neuse River buffer rules is to limit nitrogen in the
Neuse River and feel that we have me the spirit of the rule exceeded the letter of the rule
and respectfully ask the Commission to grant our variance request.
1

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t
Innovative Design, Inc. July
12, 2000

Post-development nitrogen loading rate without BMP's llbs/ac/vr1

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(2) Area (3) TN export (4) TN export
(1) Type of Land Cover (acres) coeff. (Ibs/ac/yr) from use (Ibs/ r)
Permanently protected undisturbed
open space (forest, unmown meadow) 0.40 0.60 0.24
Permanently protected manged open
space (grass, landscaping, etc.) 0.17 1.20 0.20
Impervious surfaces (roads, parking lots,
dirvewa s, roofs,paved stroage areas, etc.) 0.35 21.20 7.42
Tota I 0.92 8.55 7.86
Source: Neuse River Basin: Model Stormwater
Program for Nitrogen Control, August 30, 1999

Variance Request Form
Neuse River Basin: Nutrient Sensitive Waters Management Strategy
1 Protection and Maintenance of Riparian Areas Rule (15A NCAC .0233)
' Part 3: Water Quality Protection, Line 6
8.55 Ibs/ac/yr x 40% removal efficiency = 3.42 Ibs/ac/yr nitrogen removal
' 8.55 Ibs/ac/yr - 3.42 Ibs/ac/yr nitrogen removed = 5.13 Ibs/ac/yr nitrogen contributed
' 5.13 Ibs/ac/yr nitrogen contributed x .92 acres = 4.72 Ibs/yr contirbuted to Neuse River
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Innovative Design, Inc.
12, 2000
July

' Fi 2
gure b: Method 2 for Quantifying TN Export from Residential / Industria! 1 Commercial
Developments when f'ootpr'ints of all Impervious Surfaces sre Shown
r
Step 1: Determine area for each type of land use and enter in Column (2).
' Step 2: Total the areas for each type of land use and enter at the bottom of Column (2}.
Step 3: Multiply the areas in Column (2} by the TN export coefficients in Column (3) and enter
in Column (4}.
Step 4: Total the TN exports for each type of land use and enter at the t~tiom of Column (4).
' Step 5: Determine the export coefficient for site by dividing the total TN export from uses at the
bottom of Column t4) by the total area at the bottom of Column (2).

1
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(1) (2) l3) (4}
Type of Land Cover Ana TN export coeff. TN export from use
(acres) (Ibsl~ciyr) (Ibayr)
Permanently protected undisturbed 0.6
open space (forest, unmown meadow)
Penmanently protected msnaged 1.2
open space (grass, landscaping, etc.)
Impervious surfaces (roads, parking 21.2
lots, drtvewrys, roofs, paved storage
areas, •tc.)
TOTAL W
The rule requires that all new developments achieve a nitrogen export of less than or
cgval to 3.6 pounds per acre per year. If the development contributes greater than 3.6
Ibs/ac/yr of nitrogen, then the options shown in Table 2a are available based on whether
' the development is residential ornon-residential.

i
Table 2a: Nitrogen l=Ynnrt R~riiirffnn Anflnn:
Raefdentlaf Commercial I tndustrlal
If the computed export is less than 6.0 If the computed export is less than 10.0
Ibs/acJyr, then the owner may either. Ibs/acJyr, then the owner may either.
1. Install 8MP5 to remove enough nitrogen 1. Install BMPs to remove enough nitrogen to
to bring the development down to 3.6 bring the development down to 3.6
IbsJacJyr_ Ibs/aclyr,
2. Pay eons-time offset payment of 5330/1b 2. Pay eons-time offset payment of 5330/1b to
to bring the nitrogen down to the 3.6 bring the nitrogen down to the 3.6 Ibslaclyr.
Ibs/adyr. 3. Do a combination of BMPs and offset
3. Do a combination of BMPs and offset payment to achieve a 3.6 IbslacJyr export
pa ment to achieve a 3.6 tbs/acJyr export
If the computed export is greater than 6.0 !f the computed export is greater than 10.0
Ibs/aGyr, then the owner must use on-site Ibs/adyr, then the owner must use on-site
BMPs to bring the development's export down BMPs to bring the development's export down
to 6.0 Itzs/ac/yr. Then, the owner may use one to 10.0 Ibs/aclyr. Then, the owner may use one
of the three options above to achieve the of the three options above to achieve the
reduction between 6.0 and 3.6 Ibs/adyr_ reduction between 10.0 and 3 6 Ibs/adyr
13

y(~ 1 V

The flow control requirement is not required for developments that meet one or all_of the
following requirements:
• The increase in peak flow between pre- and post~levelopment conditions does not
excad ten percent (note that this exemption makes it easier to conduct redevelopment
activities)-
The proposed new development meets all of the following criteria overall
impervious surface is less than fifteen percent, and the remaining pervious portions of
the site arc utilized to the maximum extent practical to convey and control the
stormwater runoff.
It is recognized that in certain parts of drainage basins, stormwater detention can
aggravate local flooding problems. Communities may need to tailor requirements or
provide exemptions to those specific locations.
2-E. BMPs for Reducin8 21Htrogen
Desig_n~ best management practices that remove nitrogen from stormwater is a
developing field Researchers throughout the country, particularly in the Southeast, are
conducting studies to determine effective means of controlling nitrogen. At the present
time, current data indicate that most BMPs remove only 20 to 40 percent of total nitrogen
on a consistent basis. Ail BMPs require regular maintenance and some have varying
performance depending on soil type and the season. It is crucial to consider the issues of
aesthetics, long-term maintenance, safety and reliability in BMP design.
Since it is relatively difficult to design and maintain BMPs that remove nitrogen, the TN
accounting method in 2-C was designed to provide credits for site planning practices that
reduce nitrogen loadings from new development. These planning measures include
reducing impervious surfaces and protecting open spaces. More detail on planning
measures that reduce nitrogen loading is given in Appendix G.
The fallowing BMPs may be utilized for reducing nitrogen from new developments:
• Wet detention ponds
• Constructed wetlands
• Open channel practices
• Riparian buffers
• Bioretention
• Proprietary BMPs
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7

The Neuse Stormwater Team estimated total nitrogen removal rates for various BMPs by
conducting a literature search of studies performed on BMPs. The total nitrogen BMP
removal rates based on current literature studies are provided in Table 2c below. A
summary of these literature studies is given in Appendix H.
Table 2c: BMP Types, TN Removal Rates and Design Standards

BMP Typs TN Rsmoval Rate
based on Current
Literature >3tudfes
Appropriate Deefgn Standards
Wet detention ponds 25% NC and MD Design Manuals
Constructed wetlands 40% NC and MO Des' n Manuals
Open channel practices 30% NC and MD Des' n Manuals
Rlpanan buffers 30°~ Neuse Riparian Buffer Rule (15A NCAC 28
.0233
Vegetated filter strips with
level spreader 20°~ NC and MD Design Manuals and other
literature information
Bioretention 25% NC and MD Desi n Manuals
Sand Fitters 35°!° NC and MD Desi n Manuals
Pro rietary BMPs Varies Par manufacturer sub' ct to DWO approval
Other BMPs Varies Subject to DWQ approval
If more than one $MP is installed in series on a development, then the removal rate shall
be determined through serial rather than additive calculations. For example, if a wet
detention pond discharges through a riparian buffer, then the removal rate shall be
estimated to be 47.5 percent. (The pond removes 25 percent of the nitrogen and
discharges 75 percent to the buffer. The buffer then removes 30 percent of the nitrogen
that discharged from the pond, which is 22.5 percent. The sum of 25 and 22.5 is 47.5.
The removal rate is NO"I.25 percent plus 30 percent.)
2-F. BMP Ma><tttertbtnce
If BMPs are implemented to achieve the nitrogen loading and flow attenuation
requirements for a development, then the local governments must require a maintenance
plan for the BMPs. The stormwater management plan must describe the local
government's selected approach for assuring BMP maintenance. Possible options to be
considered include, but are not limited to, the following:
The jurisdiction can charge a stormwater maintenance fee and assume the
responsibility of maintaining the stormwater $MP itself, including providing annual
inspection.
~ The jurisdiction can notify the owner upon finding that maintenance is needed on a
BMP. If the owner does not complete the maintenance himself in a timely manner,
then the jurisdiction can contract out the maintenance itself and recover costs in the
manner it determines most appropriate.
16

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AGENDA ITEM # 1 ~
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Consideration of a Request for a Variance from the Neuse River
Riparian Area Protection Rule
A request has been received for the Water Quality Committee (WQC) to grant a variance from
the Neuse River Riparian Area Protection Requirements for a Congregate Care Facility project to
be located on the west side of Hilburn Drive, approximately'/z mile north of the intersection of
Hilburn Drive and Lynn Road, Raleigh, Wake County, North Carolina. The parcel size is
approximately 0.92 acres in size. The applicant, Mr. John R. Adams, is proposing to pipe and fill
approximately 901inear feet of channel and associated riparian buffers of an unnamed tributary of
Turkey Creek (C NSW).
Mr. Adams is proposing 1,708 ftZ of extended detention wetland to control stormwater run-off
from the proposed facility and new impervious surfaces. Mr. Adams is also proposing the use of
a solar collection system for heating, thereby reducing the amount of nitrogen entering the
atmosphere associated with production of electricity required to provide the equivalent amount of
heating. Mr. Adams is not proposing any buffer mitigation to compensate for the loss of the ±
20,736 ftZ of protected riparian buffer.
Recommendations:
1. The Division Staff do not believe that Mr. Adams' request has met all of the requirements
[(identified within 15A NCAC 2B .0233(9)(a) -see back of this sheet] for granting a variance.
Specifically, the 0.92 acre subject property was subdivided from the original, larger tract of
land on June 12, 1998 (after the effective date of the rules) in a manner that made the
property not~uild as proposed without the approval of this variance. Therefore, the
Division Staff believe that Mr. Adams has brought this hardship upon himself and is not
eligible for a variance from the rules.
Z. The Division Staff believe, if the variance request is deemed to be eligible by the
Commission, that Mr. Adams is proposing sufficient nitrogen removing stormwater controls
to compensate for the loss of the nutrient removal functions of the impacted buffers.
3. The Division Staff, believe that buffer mitigation (not proposed within Mr. Adams' request)
per 15A NCAC 2B .0242 be added as a condition to the variance, if approved, to compensate
for the loss of the riparian buffer. Following the recommended ratios in the rules, this action
would require 21,600 square feet of buffer mitigation or a payment into the Riparian Buffer
Mitigation Fund of $20,736.
The Division Staff recommends the denial of Mr. Adams' variance request, because of the
items identified in part 1 of this recommendation.

r
15A NCAC NEUSE RIVER BASIN: NSW STRATEGY
(9) VARIANCES. Persons who wish to undertake uses designated as prohibited may
pursue a variance. The Division or the appropriate delegated local authority may grant
minor variances. The variance request procedure shall be as follows:
(a) For any variance request, the Division or the delegated local authority
shall make a finding of fact as to whether the following requirements
have been met:
(i) There are practical difficulties or unnecessary hardships that
prevent compliance with the strict letter of the riparian buffer
protection requirements. Practical difficulties or unnecessary
hardships shall be evaluated in accordance with the following:
(A) If the applicant complies with the provisions of this
Rule, he/she can secure no reasonable return from, nor
make reasonable use of, his/her property. Merely
proving that the variance would permit a greater profit
from the property shall not be considered adequate
justification for a variance. Moreover, the Division or
delegated local authority shall consider whether the
variance is the minimum possible deviation from the
terms of this Rule that shall make reasonable use of the
property possible.
(B) The hardship results from application of this Rule to the
property rather than from other factors such as deed
restrictions or other hardship.
(C) The hardship is due to the physical nature of the
applicant's property, such as its size, shape, or
topography, which is different from that of neighboring
property.
(D) The applicant did not cause the hardship by knowingly
or unknowingly violating this Rule.
(E) The applicant did not purchase the property after the
effective date of this Rule, and then requesting an
appeal.
(F) The hardship is unique to the applicant's property, rather
than the result of conditions that are widespread. If
other properties are equally subject to the hardship
created in the restriction, then granting a variance would
be a special privilege denied to others, and would not
promote equal justice;
(ii) The variance is in harmony with the general purpose and intent
of the State's riparian buffer protection requirements and
preserves its spirit; and
(iii) In granting the variance, the public safety and welfare have been
assured water quality has been protected, and substantial justice
has been done.

MAJOR VARIANCE REQUEST
NEUSE RIVER RIPARIAN BUFFER PROTECTION RULES
15A NCAC 2B .0233
DATE: SEPTEMBER 13, 2000
PROPERTY OWNER: MR. JOHN R. ADAMS
PROJECT NAME: HILBURN DRIVE CONGREGATE CARE FACILITY
LOCATION: RALEIGH, NC
PROPERTY SIZE: 0.92 AC
IMPACTED STREAM: UNNAMED TRIBUTARY STREAM TO TURKEY CREEK (B NSW)
WETLAND IMPACT: 0 AC
STREAM IMPACT (LINEAR FEET): 90 LF
BUFFER IMPACT (FTZ): 5,400 (ZONE 1); 3,600 (ZONE 2); 9,000 (TOTAL)
REQUIl2ED BUFFER MITIGATION (FTZ): 16,200 (ZONE 1); 5,400 (ZONE 2); 21,600 (TOTAL)
REQUIRED PAYMENT INTO RIPARIAN BUFFER RESTORATION FUND: -$20,736
STREAM MITIGATION: NOT REQUIRED (DETERMINED TO BE AN INTERMITTENT STREAM
BY DWQ STAFF)
STORMWATER CONTROL: EXTENDED DETENTION WETLAND (1,708 ftz) TO CONTROL
ON-SITE STORMWATER
DWQ RECOMMENDATION:
1. The Division Staff do not believe that Mr. Adams' request has met all of the requirements
[(identified within 15A NCAC 2B .0233(9)(a)] for granting a variance. Specifically, the 0.92
acre subject property was subdivided from the original, larger tract of land on June 12, 1998
(after the effective date of the rules) in a manner that made the property not buildable in the
as proposed without the approval of this variance. Therefore, the Division Staff believe that
Mr. Adams has brought this hardship upon himself and is not eligible for a variance from the
rules.
2. The Division Staff believe, if the variance request is deemed to be eligible by the
Commission, that Mr. Adams is proposing sufficient nitrogen removing stormwater controls
to compensate for the loss of the nutrient removal functions of the impacted buffers.
3. The Division Staff, believe that buffer mitigation (not proposed within Mr. Adams' request)
per ISA NCAC 2B .0242 be added as a condition to the variance, if approved, to compensate
for the loss of the riparian buffer.
The Division Staff recommends the denial of Mr. Adams' variance request, because of the
items identified in part 1 of this recommendation.

t A
Request for a Variance to the Neuse River Buffer Rules
' North Carolina Environmental Management Commission
Water Quality Committee
t September 13, 2000
Neuse River Basin: Nutrient Sensitive Waters Management Strategy
Protection and Maintenance of Riparian Areas Rule (15A NCAC .0233)

Owner: Architect: Civil Engineer:
John Adams Michael Nicklas, AIA Mac McIntyre, PE
' 3025 Westbury Dr. Innovative Design, Inc. Parquer & Associates
Raleigh, NC 27606 850 West Morgan Street 4926 Windy Hill Dr.

' 919.781.8826 (P) Raleigh, NC 27603 Raleigh, NC 27609
919.788.9301 (F) 919.832.6303 (P) 919.876.7778 (P)
919.832.3339 (F) 919.876.6678 (F)

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Innovative Design, Inc.

' Ce,;e~rtment of environment and Natural Resources
Civision of'.^:~aer Quality
~ Variance Request Form
Neuse River Basin: Nutrient Sensitive Waters Manageme-~t Strategy
' Protection and Maintenance of Riparian Areas Rule (15A NCAC .0233)
' NOTE: This form maybe photocopied for use as an original.
Part 1: General Information
1. Applicant's name (the corporation, individual, etc. who owns the project):
John R. Adams
' 2. Print Owner/Signing Official (person legally responsible for the facility and its compliance)
Name: John R. Adams
' Title: Owner
Street address: 3025 Westbury Dr.
City, State, Zip: Raleigh, NC 27606
t Telephone:t 19 }781.8826
Fax: [phone]
' 3. Project Name (Subdivision, facility, or establishment name -consistent with project name on
plans, specifications, letters, operation and maintenance agreements, etc.):
Hilburn Dr. Congregate Care
4. Location of Facility
Street address: 7400 Hilburn Dr.
' City, State, Zip: Raleigh, NC 27613
County: Wake
Latitudellongitude: 78°-42-53 W / 35°-52-42 N
S. Directions to facility from nearest major intersection (Also attach a map):
From intersection of I-440 (Beltline) Won US 70. North on Hilh„rn nr
' across from Raleigh Memorial Gardens. Site is approximately 1/2 mile
port o intersection of Hilburn Dr. & Lynn Rd. on west side of
urn r.
' 6. Contact person who can answer questions about the facility
Name: Michael Nicklas or Louis Gerics
Telephone: i 919 } 832.6303
' Fax: l_ 919) 832.3339
Email: innovativedesi n minds~ring.com
' 7. Requested Environmental Management Commission Nearing Date: _ Sept. 13, 2000
i
' Version 1 September 1998

' Part 2: Demonstration of Need for a Variance
NOTE: The variance provision of the Neuse Riparian Area Rule allows the Environmental Management
' Commission to grant a variance to an affected party when the following conditions apply on a given project:
(a) practical difficulties or hardships would result from strict application of the rule:
(b) such difficulties or hardships result from condidos which are peculiar to the p; operty involved; and
' (c) the general purpose and intent of the Rule would be preserved, water quality would be protected and
substantia! justice would be done if the variance were granted.
This part of the application is to explain how the project meets criteria (a) and (b).
' 1. Attach a detailed description (2-3 pages) explaining the following:
• The practical difficulties or hardships that would result from strict application of the Rule.
' How these difficulties or hardships result from conditions that are unique to the property
involved.
• Why reconfiguring and/or reducing the built-upon area to preserve a greater portion of the
' riparian area is not feasible on this project. If economic hardship is the major
consideration, then include a specific explanation of the economic hardship and the
proportion of the hardship to the entire value of the project.
' Part 3: Water Quality Protection
' NOTE: This part of the application is to explain how the project meets criterion (c): the general purpose and
intent of the Rule would be preserved, water quality would be protected and substantial justice would be done if
the variance were granted.
' 1. Briefly summarize how water quality will be protected on this project. Also attach a detailed
narrative (1-2 pages) describing the nonstructural and structural measures that will be used
' for protecting water quality and reducing nitrogen inputs to surface water.
A extended detention wetland will mitigate the run off from new impervious
surfaces. It will be two and one half times the required area. The
' existing outlet from storm sewers will be re-routed through a new swale.
ona y, we Wl ncorporate a a vance so ar energy collection
system to displace up to 144 pounds of atmospheric nitrogen.
' 2. What is the total project area in acres? .92
' 3. Which of the following permits/approvals will be required for this project?
CAMA Major
x Sediment/Erosion Control
' x 401 Certification/404 Permit

' Variance Request Form, page 2
Version 1: September 1998

J

n

Part 3: Water Quality Protection, continued
4. Complete the following information for each drainage basin. If there are more than two
drainage basins in the project, attach an additional sheet with the information for each basin
provided in the same format as below.
Project Information Drainage Basin 1 Drainage Basin 2
Receiving stream name Unnamed tributary to urkey Creek
Receiving stream class' B NSW
Drainage basin area (totalz) 15.83 acres
Existing impervious area (totalz) 11.06 acres
Proposed impervious area (totalz) 1 acres
Impervious area (on-site) 38.04
Impervious area (total) 24. 19~
Impervious area' ! Drainage basin 1 Drainage basin 2
On-site buildings ~ .187 acres
On-site streets ~ N/A
On-site parking I .105 acres
On-site sidewalks ~ .015 acres
Other on-site I .002 acres
_~Totat'.on `srte ~:.x.~-~:,~~~~^-- `~ _ :;^' .~,~. ~.~:.~*"~%'
Off-site ~ 1.41 acres

The intemet site forthrs information is httpJ/hzo.enr.state.nc.us/strmclass/a/pna/neu.hrml
' z Total means on-site plus off-site area that drains through the project.
' Impervious area is defrned as the built-upon area including, but not limited to, buildings, parking areas,
sidewalks, grave! areas, etc.
C

5. How was the off-site impervious area listed above derived?
Raleigh Planning Department map, project site plan and adjacent apartments
site p an
6. What will be the annual nitrogen load contributed by this site after development in pounds per
acre per year without structural BMPs (stormwater pond, wetland, infiltration basin, etc)?
Attach a detailed plan for all proposed structural stormwater BMPs.
Drainage Size of
basin i drainage
basin
(ac) Posi-development i
nitrogen loading rate
without BMPs'
(Ibs/ac/yr) BMP nitrogen
removal
efficiencys ~
(%) Final nitrogen
loading rate
(Ibs/ac/yr)
1 .35 ~ 21.2 ~~ 40 ~ 12~7~
I .17 ~ 1.2 I 30 ~ .84 ~
3 ~ .40 .6 .42
4
5 ~ I
:Totals . 9 2 ------
Final nitrogen ~
loading from
drainage basin
(Ibs)
_4.45 _~
.14
17
4.76
s Attach calculations and references. Drainage basins are all on our site. They are
Attach calculations and references. differentiated as follows
1. New impervious surfaces
Variance Request Form, page 3 2. New managed open spaces
Version 1: September 1998 3. undistirbed open spaces
Only the .35 ac. new impervious surfaces are
treated in the extended detention wetland.

1

Part 3: Water Quality Protection, continued
7. The applicable supplemental form(s) listed below must be attached for each BMP specified:
Form SWU-102 Wet Detention Basin Supplement
Form SWU-103 Infiltration Basin Supplement
Form SWU-105 Curb Outlet System Supplement
Form SWU-106 Off-Site System Supplement
Form SWU-107 Underground Infiltration Trench Supplement
Form SWU-109 Innovative BMPs Supplement
Part 4: Submittal Checklist
A complete appplication submittal consists of the following components. Incomplete submittals
will be returned to the applicant. The complete variance request submittal must be received 90
days prior to the EMC meeting at which you wish the request to be heard. Initial below to
indicate that the necessary information has been provided.
Applicant's
Initial
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Item
• Original and two copies of the Variance Request Form and the attachments
listed below.
• A vicinity map of the project (see Part 1, Item 5)
• Narrative demonstration of the need for a variance (see Part 2)
• A detailed narrative description of stormwater treatment/management (see Part
3, Item 1)
• Calculations supporting nitrogen loading estimates (see Part 3, Item 6)
• Calculations and references supporting nitrogen removal from proposed BMPs
(see Part 3, Item 6)
• Location and details for all proposed structural stormwater BMPs (see Part 3,
Item 6)
• Three copies of the applicable Supplement Form(s) for each BMP and/or
narrative for each innovative BMP (see Part 3, Item 7)
• Three copies of plans and specifications, including:
0 Development/Project name
0 Engineer and firm
0 Legend and north arrow
0 Scale (1" = 100' or 1" = 50' is preferred)
0 Revision number & date
0 Mean high water line (if applicable)
0 Dimensioned property/project boundary
0 Location map with named streets or NC State Road numbers
0 Original contours, proposed contours, spot elevations, finished floor
elevations
0 Details of roads, parking, cul-de-sacs, sidewalks, and curb and gutter
0 Footprint of any proposed buildings or other structures
J Wetlands delineated, or a note on plans that none exist
0 Existing drainage (including off-site), drainage easements, pipe sizes, runoff
calculations
0 Drainage basins delineated
0 Perennial and intermittent streams, ponds, lakes, rivers and estuaries
G Location of forest vegetation along the streams, ponds, lakes, rivers and
estuaries
' Variance Request Form, page 4
Version 1: September 1998

I-QI L J. 1./GC~J 1\G~7U IVLIVIIJ
By your signature in Part 7 of this application, you certify that all structural stormwater best
management practices required by this variance shall be Iccated in recorded stormwater
easements, that the easements will run with the land, that the easements cannot be changed or
deleted without concurrence from the State, and that the easements will be recorded prior to the
sale of any lot.
Part 6: Agent Authorization
If you wish to designate submittal authority to another individual or firm so that they may provide
information on your behalf, please complete this section:
Designated agent (individual or firm): Innovative Design, Inc.
Mailing address: 85o w. Morgan st.
City, State, Zip: Raleigh, NC 27603
Telephone: [phone]
Fax: [phone]
Email: [e-mail]
Part 7: Applicant's Certification
I, John R. Adams (print or type name of person
listed in Part I, Item 2), certify that the information included on this permit application form is
correct, that the project will be constructed in conformance with the approved plans and that the
deed restrictions in accordance with Part 5 of this form will be recorded with all required permit
conditions.
' Signature: ' , --
Date: A ust 21
Title: ayi/
Variance Request Form, page 5
Version 1: September 1998

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Variance Request Form
Neuse River Basin: Nutrient Sensitive Waters Management Strategy
Protection and Maintenance of Riparian Areas Rule (15A NCAC .0233)

'

Part 2: Demonstration of a need for a Variance '
Strict application of the Rule would result in a lot that would not be able to support the intended
project and would deprive the owner of profits from building and operating the proposed '
facility. The intended use of the property is a congregate care facility. City of Raleigh policy
promotes such projects by allowing residential densities to be doubled for adherence to
planning guidelines for such facilities. '
The land is currently zoned R-10. The project is designed for 18 units of elderly housing. If the
variance is not granted, there would be no room on the site for any of the common indoor

facilities required by the City of Raleigh for a congregate care center to be built and there could '
be, at most, only three units. The only other foreseeable use of the property would be for a
single detached residence. '
The site is small, only .92 acres. It is from 355 to 412 feet long in the north south direction and
from 88 to 130 feet wide. Zoning setbacks require 26 feet of the width. An unnamed perennial

creek runs from the north east corner of the lot in a southwesterly direction to a point '
approximately dividing the west property line in half. Additionally, an intermittent stream
bisects the area of the lot south of the perennial stream. The intermittent stream flows into the '
unnamed perennial stream, which ultimately flows into Turkey Creek. The intermittent stream
has been ruled a regulated, brown line stream, subject to buffer rules. Steve Mitchell and Bob
Zarzecki of the Division of Water Quality, NC Department of Environment and Natural '
Resources have inspected the site. The intermittent stream is the source of our hardship. The
buffers presented by the perennial stream leave just enough room to build the project with only
a minor variance required to build the driveway to the building through the Zone 2 buffer. '
The buffers for the intermittent stream consume the majority of the lot outside of the perennial
stream buffer. Please see the attached site plan for the proposed building footprint and

riparian buffers. '
We also feel that the intermittent stream is more of a contributor of nitrogen to the Neuse River '
than our proposed project and nitrogen mitigation solution would ever be. The stream is now
but a small remnant of the original channel. It is now, for all intents and purposes, only an
outfall channel for storm drain catch basins located on Hilburn Dr. The thirty inch concrete '
pipe that feeds the stream drains over three and one half acres. The channel only has water
flowing when rainwater washes over the off site drainage area, over Hilburn Dr. and empties
directly into the perennial stream. Our proposed design would greatly decrease the rate of the '
discharge directly into the perennial stream by giving the storm water some chance to perk into
the ground by not being channeled directly into the river system during a storm event.
We would also like to point out that the City of Raleigh allowed the property map to be '
recorded in June 1998 without requiring the intermittent stream to be recorded as Neuse River
buffer. The stream still does not appear on the City of Raleigh Planning Department property '
maps as of today (please see the attached map). We feel that if the City of Raleigh did not
require recording the buffers on the intermittent stream the Commission look upon this as
additional reason to grant us this variance. '
Innovative Design, Inc. September 13, 2000

Variance Request Form
Neuse River Basin: Nutrient Sensitive Waters Management Strategy
Protection and Maintenance of Riparian Areas Rule (15A NCAC .0233)
Furthermore, as a consequence of the City not requiring the intermittent stream to be
recorded, the owner and design team substantially completed plans for the project under the
impression the stream was not regulated as river buffer (please see attached plans). The
surveyor had noted the buffers on the perennial stream, as required by the City of Raleigh, for
recording the lot, but not buffers on the intermittent stream. We began the design work in
December 1999, in good faith, believing the stream was not regulated. We did not learn the
stream was potentially regulated until May 22, 2000 during a meeting with Bob Zarzecki to
review our driveway crossing. He and Steve Mitchell confirmed the stream was regulated in
their site inspections of May 26 and May 30, 2000. We would like to ask the Commission to
take our good faith efforts and the owner's substantial expense for design fees under
consideration.
We also feel that depriving the owner of the use of his land would have an economic impact.
The current value of the land is approximately $80,000. Our estimates of the cost of building
and operating the congregate care facility show a monthly profit of approximately $6,000 or
$72,000 annually. The owner could recoup the cost of his land in just over a year and be
making profit on the land cost after that for many years if the variance is granted. We feel that
the strict adherence to the rule would deprive the owner of that long-term income.
Finally, we would like the Commission to take under consideration the very lengthy approval
process the parent tract of land went through that has brought us to this point. The site in
question was once part of a larger tract of land owned by Mr. Adams since 1984. That tract of
land was developed into an apartment complex and shopping center. In order to increase the
density of the apartment complex, the developers were required to apply for a special use
permit form the City of Raleigh Planning Commission. The application was made February 1,
1996. After numerous requests for revisions by the city, the permit was granted August 12,
1997, over eighteen months after applying for the permit. The approved site plan was
submitted to the City July 23, 1997; one day after the Neuse River buffer rules took effect.
One condition of approval was that the property map be recorded within one year. It was
recorded in June 1998. By that point in time, the apartment developer had decided the small
tract was not needed for their project and the land reverted to Mr. Adams' ownership. We
would like the Commission to consider that, had the City not taken a very lengthy amount of
time to approve the permit, the recording of the site would, in all probability, not be an issue
now. The Division of Water Quality could be in a position to support our request for a variance
had the City not taken eighteen months to approve the special use permit.

Innovative Design, Inc. September 13, 2000

Variance Request Form
Neuse River Basin: Nutrient Sensitive Waters Management Strategy
Protection and Maintenance of Riparian Areas Rule (15A NCAC .0233)
Part 3: Water Quality Protection
Structural Measures
The structural measures we are employing on our site consist of rerouting the existing storm
drain that carries off site storm water across our site and adding an extended detention
wetland to treat the water from all new, impervious surfaces on our site.
The existing storm drain currently empties directly into the intermittent stream, which flows into
the unnamed perpetual creek. It currently drains approximately 3.88 acres. The proposed
drain empties into a swale. The swale will flow approximately ninety feet over managed
vegetation before returning to the intermittent stream's original bed near its intersection with
the perennial stream. It should also be noted that the proposed storm drain completely
bypasses the new extended detention wetland.
The extended detention wetland will treat all water coming off all new impervious surfaces on
the site. The area of new impervious surface is .35 acres. We are required by regulation to
have 644 square feet of extended detention wetland on our site (see Parker-Lincoln Basin
Design Calculations sheet). We have 1,708 square feet of extended detention wetland on our
site. The 644 square feet is required for 40% nitrogen removal efficiency. This is 2.97 pounds
of nitrogen per year removed by the extended detention wetland, or, conversely, 4.59 pounds
of nitrogen allowed to reach the Neuse River from new impervious surfaces on our site. At
over two and one half times the required wetland, we should, theoretically, achieve close to
nitrogen free discharge into the Neuse River system from our new impervious surfaces. The
total unmitigated nitrogen load from the basin draining over our land is 33.5 pounds per year.
Please note that water from all grass and landscaped areas will be directed over the riparian
buffers.
The extended detention wetland is to comp)
Environment and Natural Resources. Todd St.
of Water Quality has reviewed the design of b
site drainage around the new extended deten
wetland.
y with specifications of the NC Department of
John, a water quality engineer with the Division
oth the proposed storm drain for bypassing off
tion wetland and the new extended detention
Non Structural Measures
The Hilburn Dr. Congregate Care center will employ an advanced solar energy collection
system. The heat collected by the solar system will be used to provide for the domestic hot
water and space heating needs of the building. The solar system will also contribute heat used
by an advanced absorption chiller for air conditioning.
The use of the solar system will replace using electricity to run this equipment and make the
domestic hot water. The solar system will contribute the annual equivalent of 86,708 kWh of
energy. The amount of nitrogen oxide emitted into the atmosphere to produce one kWh of
electricity is .005 pounds (Cool Companies: How the Best Businesses Boast Profits and
Productivity by Cutting Greenhouse Gas Emissions by Joseph J. Romm, Island Press, 1999).

t

Innovative Design, Inc. September 13, 2000

Variance Request Form
Neuse River Basin: Nutrient Sensitive Waters Management Strategy
Protection and Maintenance of Riparian Areas Rule (15A NCAC .0233)
'
To make 86,708 kWh emits 433.54 pounds of nitrogen oxide. If we assume that the nitrogen '
component is one-third of the nitrogen oxides, we will be avoiding up to 144.42 pounds of
nitrogen per year emitted into the atmosphere that will fall to earth in the rain cycle. This is
141.45 pounds more than the 2.97 pounds of nitrogen we are required to remove with the '
extended detention wetland, or 48.63 times the amount of nitrogen removed by the required
644 square feet of extended detention wetland.
Additionally, the site will remain forested in the Zone 1 buffer, except where the wetland and a
pervious surface walking path will be built.
We understand that the intent of the Neuse River buffer rules is to limit nitrogen discharge into
the Neuse River and feel that we have met the spirit of the rule and exceeded the letter of the
rule and respectfully ask the Commission to grant our variance request.

Innovative Design, Inc. September 13, 2000

Post-development nitrogen loading rate without BMP's (Ibs/ac/yr)
(2) Area (3) TN export (4) TN export
1 T e of Land Cover acres coeff. Ibs/ac/ r from use Ibs/ r
Permanently protected undisturbed
open space (forest, unmown meadow) 0.40 0.60 0.24
Permanently protected managed open
space (grass, landscaping, etc.) 0.17 1.20 0.20
Impervious surfaces (roads, parking lots,
dirvewa s, roofs, aved stroa a areas, etc. 0.35 21.20 7.42
Total 0.92 - 7.86
Source: Neuse River Basin: Model Stormwater
Program for Nitrogen Control, August 30, 1999

t

~.~

I~

Innovative Design, Inc. September 13, 2000

Variance Request Form
Neuse River Basin: Nutrient Sensitive Waters Management Strategy
Protection and Maintenance of Riparian Areas Rule (15A NCAC .0233)
Part 3: Water Quality Protection, Line 6
1. New Impervious Surfaces "Basin":
21.2 Ibs/ac/yr x 60% contribution = 12.72Ibs/ac/yr x .35 a = 4.45Ibs/yr nitrogen
contribution
Or
21.2 Ibs/ac/yr x 40% removal efficiency =8.48 Ibs/ac/yr x .35ac = 2.97 Ibs/yr nitrogen
removed
2. New Managed Open Space "Basin":
1.2 Ibs/ac/yr x 70% contribution = .84 Ibs/ac/yr x .17 ac = .14 Ibs/yr nitrogen contribution
3. Undisturbed Open Space "Basin":
.6 Ibs/ac/yr x 70% contribution = .42 Ibs/ac/yr x .40 ac = .17 Ibs/yr nitrogen contribution
Total Nitrogen Loading from all "Basins" = 4.45 + .14 + .17 = 4.76 Ibs/yr
Total Nitrogen Loading from new construction (impervious + managed open space) = 4.45 +
.14 = 4.59 Ibs/yr.
The calculation for Final Nitrogen Loading is split into the three "Basins" because only the
water from the new impervious surfaces is treated in the proposed extended detention
wetland. Water from the managed open space and undisturbed open space is discharged and
"treated" across the riparian buffers at 30% removal efficiency.

u

Innovative Design, Inc. September 13, 2000

`~
Parker
s~Associates
ENVIRONMENTAL, HEALTH
AN^SAEETYCONSULTANTS
SITE DEVELOPMENT
h.'JD PLANNING CONSULTANTS
Parker & Associates,lnc.
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Basin Design Calculations '
1. Calculate Basin Size
'
Im ervious area = .35 AC
p
Total drainage area to wetlands = .40 AC '
.35/.40 = .88 = 88%
Average Depth of Pool = 3 feet
From Table 1.1 with 88% impervious area and 3 foot depth, the SA/DA ratio '
is given as 3.701
The surface area required would be SA = (3.70/100) x .40 acres = .0148 AC = '
644 sq.ft
The surface area provided by the proposed wetland basin is 1,708 square feet. '
This is almost three (3) times more than the minimum required size.
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Calculate the design run off volume (the temporary water quality pool) that '
must be held in pond above the permanent pool level.
RV = 0.05 + 0.009 (88) '
RV = 0.84 (in/in)
Find the volume to be controlled
Volume = (Design Rain Fall) (RV) (Drainage Area)
Volume = 1 in. Rainfall x 0.84 in/in x 1/12 ft/in x .40 AC ,
Volume = 0.028 AC feet or 1,219 cubic feet
The additional vertical water storage required is .71 feet or 8.5 inches. '

1
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FigurQ 2b: Method 2 for Quantifyin TN Ex ort from Residential I lndu '
g A steal /Commercial
Developments when Footprints of all Impervious Surfaces aro Shown
Step 1: Determine area for each type of land use and enter in Column (2)
Step 2: Total the areas for each type of land use and enter at the bottom of Column (2).
Step 3: Multiply the areas in Column (2} by the TN export coefficients in Column (3) and enter
in Column (4},
t Step 4: Total the TN exports for each type of land use and enter at the bottom of Column (4).
Step 5: Determine the export coefficient for site by dividing the total TN export from uses at the
bottom of Column (4) by the total area at the bottom of Column (2).

(~) (2) (3) (4)
Type of tend Cover Aroa TN export coef'f. TN export from use
(acros) (Ifssls r) (Ibalyr)
Permanently protected undisturbed 0.6
open space (forest, unmown meadow)
Permanently protected managed 1.2
open apace (grass, landscaping, etc.}
Impervious surfaces (roads, parking 21.2
lots, driveways, roofs, paved storage
areas, etc.)
TOTAL W
' The ntle requires that all new developments achieve a nitrogen export of less than or
equal to 3.6 pounds per acre per year. If the development contributes greater than 3.6
Ibs/ac/yr of nitrogen, then the options shown in Table 2a are available based on whether
the development is residential ornon-residential.
t

Table Za: Nitrogen F~ceert R~ductlen ~ntien~
Resfdentlal Commercial l lnduatrial
If the computed export is less than 6.0 If the computed export is less than 10.0
Ibs/a~Jyr, then the owner may either: IbslacJyr, then the owner may either.
1. Install BMPs to remove enough nitrogen 1. Install BMPs to remove enough nitrogen to
to bring the development down to 3.6 bring the development down to 3.6
IbslacJyr. Ibs/ac/yr.
2. Pay gone-time offset payment of 5330/lb 2. Pay gone-time offset payment of S330Ab to
to bring the nitrogen down to the 3.6 bring the nitrogen down to the 3.6 Ibs/acJyr.
Ibs/aGyr, 3. Do a combination of BMPs and offset
3. Do a combination of BMPs and offset payment to achieve a 3.6 IbsJarJyr export.
pa meet to achieve a 3.6 Ibs/adyr export
If the computed export is greater than 6.0 If the computed export is greater than 10.0
lbs/acJyr, then the owner must use on-site Ibs/adyr, then the owner must use an-site
BMPs to bring the development's export down BMPs to bring the developments export down
to 6.0 Ibs/aGyr. Then, the owner may use one to 10.0 Ibs/acJyr. Then, the owner may use one
of the three options above to achieve the of the three options above to achieve the
reduction between 6.0 and 3.6 Ibs/a~Jyr. reduction between 10.0 and 3.6 Ibs/acJyr.
13

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The flew control requirement is not required for developments that meet one or all_of the
following requirements:
• The increase in peak flow between pre- and past-development conditions does not
exceed ten percent (note that this exemption makes it easier to conduct redevelopment
activities)-
The proposed new development meets all of the following criteria: overall
impervious surface is less than fifteen percent, and the remaining pervious portions of
the site are utilized to the maximum extent practical to convey and control the
starmwater runoff.
It is recognized that in certain parts of drainage basins, stormwater detention can
aggravate local flooding problems. Communities may need to tailor requirements or
provide exemptions to those specific locations.
2-E. BMPs for Reducing Niltrogen
Designing best management practices that remove nitrogen from stormwater is a
developing field. Researchers throughout the country, particulazly in the Southeast, are
conducting studies to determine et~'ective means of controlling nitrogen. At the present
time, current data indicate that most BMPs remove only 20 to 40 percent of total nitrogen
an a consistent basis. All BMPs require regular maintenance and some have varying
performance depending on soil type and the season. It is crucial to consider the issues of
aesthetics, long-term maintenance, safety and reliability in BMP design.
Since it is relatively difficult to design and maintain BMPs that remove nitrogen, the TN
' accounting method in 2-C was designed to provide credits for site planning practices that
reduce nitrogen loadings from new development. These planning measures include
reducing impervious surfaces and protecting open spaces. More detail on planning
measures that reduce nitrogen loading is given in Appendix G.

The following BMPs may be utilized for reducing nitrogen from new developments:
• Wet detention ponds
• Constructed wetlands
• Open channel practices
• Riparian buffers
• Bioretention
• Proprietary BMPs
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The Neusc Stormwater Team estimated fatal nitrogen removal rates for various BMPs by
conducting a literature seazch of studies performed on BMPs. The total nitrogen BMP
removal rates based on current literature studies are provided in Table 2c below. A
summary of these literature studies is given in Appendix H.
Table Zc: BMP Types, TN Removal Rates and Design Standards

BMP Type TN Removal RatQ
bawd on Current
Literature Studies
Appropriate Desl~n Standards
Wet detention ponds 25% NC and MD Desi n Manuals
Constructed wetlands 40°k NC and Md Des n Manuals
Open channel practices 30°~ NC and MD Des' n Manuals
Riparian bufhrs 30°.6 Neuse Riparian Buffer Rule (15A NCAC 28
.0233
Vegetated fliter strips with
level spreader 20% NC and MD Design Manuals and other
literature information
Bioretention 25% NC and MD Desi n Manuals
Sand filters 3b% NC and MD Desi n Manuals
Pro rietary BMPs Varies Per manufacturer sub' ct to DWQ approval
Other 9MPs Varsa Sub~ect to DWQ approval
If more than one $Ml' is installed in series on a development, then the removal rate shall
be determined through serial rather than additive calculations. 1~or example, if a wet
detention pond dischazges through a riparian buffer, then the removal rate shall be
estimated to be 47.5 percent. (The pond removes 25 percent oFthe nitrogen and
discharges 75 percent to the buffer. The buffer then removes 30 percent of the nitrogen
that discharged from the pond, which is 22.5 percent. The sum of 25 and 22.5 is 47.5.
The removal rate is NOT 25 percent plus 30 percent.)
2•F. Blip 1Ka>tntenance
If BMPs aze implemented to achieve the nitrogen loading and flow attenuation
requirements for a development, then the local governments must require a maintenance
plan far the BMPs. The stormwater management plan must describe the local
government's selected approach far assuring BMP maintenance. Possible options to be
considered include, but are not limited ta, the following:
The jurisdiction can charge a stormwater maintenance fee and assume the
responsibility of maintaining the stormwater $MP itself, including providing annual
inspection.
• The jurisdiction can notify the owner upon finding that maintenance is needed on a
BMP. If the owner does not complete the maintenance himself in a timely manner,
then the jurisdiction can contract out the maintenance itself and recover costs in the
manner it detemlines most appropriate.
16
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