20100735 Ver 1_Major Variance_20101023

to-oJ35
October 26, 2010
North Carolina Department of Environment and Natural Resources
Division of Water Quality ?/
401 /Wetlands Unit Amicus ingineering
2321 Crabtree Blvd, Suite 250 Raleigh, North Carolina 27604 Sustainable Systems Design & Development
Reference: Transmittal Letter
Proposed Professional Building at Lawyers Road
Stallings, North Carolina D = ? R (? OWE'
Parcel ID: 08324002 a
Project Number: 17-10-033 OC r 2 7 2010
NCDENR Job Number: 10-0735
MW - WAMR QUALITY
Mrs. Chapman: WEn*= AND STORUWATER BRANCH
On behalf of Mr. and Mrs. Kevin Bigham, Amicus Engineering, PC (Amicus) is pleased to
submit this Variance Request and Site Specific Water Quality Plan for a proposed
professional building at Lawyers Road in Stallings, North Carolina (Parcel ID: 08324002).
The following paperwork is being submitted at your request:
a. One digital copy of the signed and sealed constructions plans and specifications
b. Four copies of the NCDENR Variance Request Form (For Major Variances)
c. Four copies of the detailed project narrative of the storm water treatment/
management plan
d. Four copies of the Expanded Proposed Activity Narrative
e. Four copies of the Bioretention Operation and Maintenance Agreement for each
BMP
f. Four copies of the Bioretention Required Items Checklist for each BMP
g. One copy of the storm water conveyance, detention, and treatment calculations
h. Four copies of the constructions plans and specifications
This variance is based on a request to use an existing man made pond that is located within
an existing 100-foot riparian buffer for extended dry detention. The use of this area for
detention would allow for the construction of a new spillway system that would greatly
benefit the downstream receiving stream as there is currently no spillway in place and
overtopping of the dam is very common during heavy rain events. The variance would also
alleviate the developer from the financial burden of having to place the required detention
system underground and construct a long retaining wall. Two water quality structures
(bioretention) were designed upstream of the proposed dry detention area and out of the
100-foot riparian buffer to treat the runoff prior to entering the detention area. Amicus
appreciates your assistance in this matter. Should any question or comments about this arise
during your review, please feel free to contact us at [phone]. Thank you for your
cooperation.
Sincerely,
Jeff McIntyre
Project Manager

Nicholas R. Parker, P.E.
President
ITINA
NCDENR
North Carolina Department of Environment and Natural Resources
Division of Water Quality
Beverly Eaves Perdue Coleen H, Sullins
Governor Director
Variance Request Form
(For Major Variances)
Protection and Maintenance of Riparian Areas Rules
NOTE: This form may be photocopied for use as an original.
Check the appropriate box below:
? Major Variance
Dee Freeman
Secretary
Qr=3
OCT E 7 2010
OEM - WATER GUMM
VrE LVOAND=MWATSPMM
? Goose Creek Watershed: Site Specific Water Quality Management Plan for
the Goose Creek Watershed: (15A NCAC 0211.0607)
Part 1: General Information
(Please include attachments if the room provided is insufficient.)
Applicant's name (the corporation, individual, etc. who owns the property):
Kevin and Margaret Bigham
2. Print owner/Signing official (person legally responsible for the property and its compliance)
Name: Kevin Bic_ham
Title: Owner
Street address: 4.007 Guardian Angel Avenue
City, State, Zip: Indian Trail, North Carolina 28079
Telephone: [phone]
Fax: [phone]
Contact person who can answer questions about the proposed project:
Name: Nick Parker
Telephone: [phone]
Fax: [phone]
Email: pMarker(d)amicusen com
4. Project name (Subdivision, facility, or establishment name - consistent with project name on
plans, specifications, letters, operation and maintenance agreements, etc.):
Proposed Professional Building at Lawyer's Road
Version 1: July 2009
Project location:
Street address: not yet established
City, State, Zip: Stallings, North Carolina
County: Union
Latitude/longitude: 35 degrees 08' 32" N 80 degrees 37' 21" W
6. Date property was purchased: 09-30-2008
7. Directions to site from nearest major intersection (Attach an 8/z x 11 copy of the USGS
topographic map indicating the location of the site).
Apporximately 1 mile Southeast of the intersection of Lawyer's Road and 1-485
8. Stream to be impacted by the proposed activity:
Stream name (for unnamed streams label as "UT" to the nearest named stream):
Which of the following permits/approvals will be required or have been received already for this
project?
Required: Received: Date received: Permit Type:
CAMA Major
CAMA Minor
401 Certification/404 Permit
On-site Wastewater Permit
X NPDES Permit (including stormwater)
Non-discharge Permit
Water Supply Watershed Variance
X Erosion/Sedimentation Control
Others (specify)
Part 2: Proposed Activity
(Please include attachments if the room provided is insufficient.)
1. Description of proposed activity [Also, please attach a map of sufficient detail (such as a plat map
or site plan in Adobe (pdf) format) to accurately delineate the boundaries of the land to be utilized
in carrying out the activity, the location and dimension of any disturbance in the riparian buffers
associated with the activity, and the extent of riparian buffers on the land. Include the area of
buffer impact in ftz.:
LV V41V ??????? Vl a y ?oz s n. buildm with comes ondin arkin infrastructure and
water quality requirements Total buffer impact = 7,525 sq ft
2. Fill in the table below to identify the square footage of impact to buffers within the 100-year
floodplain and buffers that are not within the 100 year floodplain. (Fill in the impact portion of
the table, even if mitigation is not required):
Variance Request Form, page 2
Version I July 2009
Buffer in the
100-year
Floodplain?
(Circle One)
Yes/No
Impact in
Square Feet
Buffer Impact
Number
(Indicate on
Plan Sheet)
Purpose for
the Impact Multiplier
3
Required
Mitigation
3. State reasons why this plan for the proposed activity cannot be practically accomplished, reduced
or reconfigured to better minimize or eliminate disturbance to the riparian buffers:
The impact effects are limited to an area that was previously a man-made pond. The
impact allows the property owner to use the existing pond for detention (See attached for further
explanation)
4. Description of any best management practices to be used to control impacts associated with the
proposed activity (i.e., control of runoff from impervious surfaces to provide diffuse flow, re-
planting vegetation or enhancement of existing vegetation, etc.):
_Two bioretention structures are being proposed for water ualit . A new overflow structure
and levels reader are proposed for the existing detention area to alleviate erosion of the bank
associated with overtopping. New plantings are being proposed aloe the to of the existing dam
to increase the existing riparian area. It should be noted that no trees within the riparian buffer
are going to be removed
5. Please provide an explanation of the following:
(1) The practical difficulties or hardships that would result from the strict application of this Rule.
The hardships are limited to constructabilit and economics. The flexibility to modify the
and for volume control. See attached for further ex lanation
(2) How these difficulties or hardships result from conditions that are unique to the property
involved. There is an existing man-made and in the riparian buffer. The location of the
buffer with respect to the street. See attached for further explanation)
(3) If economic hardship is the major consideration, then include a specific explanation of the
economic hardships and the proportion of the hardship to the entire value of the project.
Retaining wall and under ound detention= $150,000 > 10% of entire value to ro'ect.
(See attached for further explanation )
Part 3: Stormwater
Provide a description of all best management practices (BMPs) that will be used to control
nutrients and sedimentation impacts associated with the proposed activity. Please ensure to
include all applicable operation & maintenance agreements and worksheets for the proposed
BMPs. Also, include the BMPs on your plan sheets. Two bioretention structures sized to
handle the I `-inch of runoff_
flows for the 1-vr 24-hr; 10-3r 24 hr7 25-yr., 6-hr7 and 50-),T 6 -hr
Variance Request Form, page 3
Version 1 July 2009
2. Attach a description of how diffuse flow will be maintained through the protected riparian
buffers. Please ensure to include all applicable operation & maintenance agreements and
worksheets for the proposed diffuse flow measure(s). Also, include the diffuse flow measure(s)
on your plan sheets.
3. Attach all applicable supplement form(s) and Inspection and Maintenance (I&M) Form(s) to this
completed application. The applicable supplemental form(s) and I&M form(s) for the proposed
BMPs noted in your application can be downloaded from the following website:
http://h2o.enr state nc us/su/bmp forms htm
Part 4: Proposed Impacts and Mitigation
Provide a description of how mitigation will be achieved at your site pursuant to 15A NCAC 2B.0609
for the Goose Creek Watershed.
If buffer restoration is the method you are requesting, be sure to include a detailed planting plan to
include plant type, date of plantings, the date of the one-time fertilization in the protected riparian
buffers and a plan sheet showing the proposed location of the plantings. A guide to buffer restoration
can be downloaded at the following website: http://wR,"•,nceep net/nevus/reports/buffers ndf
If payment into a buffer restoration fund is how you plan to achieve your mitigation requirement, then
include an acceptance letter from the mitigation bank you propose to use stating they have the
mitigation credits available for the mitigation requested.
Part 5: Deed Restrictions
By your signature in Part 6 of this application, you certify that all structural stonnwater BNIPs
required by this variance shall be located 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: Applicant's Certification
r (print or type name of person listed in .
Part I, Item 2), certify that he informa on 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 cnnrl;tin„Q
Signature:
Date:
Title:
Part 7: Plan Sheets
Be sure to include a copy of all of your completed application form, plan sheets and maps in Adobe
(pdf) format on a CD or floppy disk.
Variance Request Form, page 4
Version I July 2009
Part 8: Checklist
A complete application 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 Item
Initials
_ ,TLM • Original and two copies of the Variance Request Form and the attachments
listed below.
_ JLM • A vicinity map of the project (see Part 1, Item 5)
- - JLM-- • Narrative demonstration of the need for a variance (see Part 2)
A detailed narrative description of stormwater treatment/management (see Part
4)
_,TLM
JLM Calculations and references supporting nutrient removal from proposed BMPs
•
- = (see Part 4)
_ JLM
- • Location and details for all proposed structural stormwater BMPs (see Part 4)
- • Three copies of the applicable Supplement Form(s) and I&M Form(s) for each
JLM BMP and/or narrative for each innovative BMP (see Part 4)
• Three copies of plans and specifications, including:
.1 LM 0 Development/Project name
_ _
_ JLM 0 Engineer and firm
0 Legend and north arrow
= JLN-1 0 Scale (1" = 50' is preferred)
_ JLM 0 Revision number & date
_ =.TLM 0 Mean high water line (if applicable)
_ -JLM 0 Dimensioned property/project boundary
_ _JLM 0 Location map with named streets or NC State Road numbers
_ _.T1_M 0 Original contours, proposed contours, spot elevations, finished floor
elevations
_ JLM
J LM 0 Details of roads, parking, cul-de-sacs, sidewalks, and curb and gutter
_ -
JLM 0 Footprint of any proposed buildings or other structures
_
= 0 Wetlands delineated, or a note on plans that non
i

_ -JT-M
JLM e ex
st
0 Existing drainage (including off-site), drainage easements, pipe sizes

-
TLM ,
runoff calculations
. 0 Drainage basins delineated
0 Perennial and intermittent streams, ponds, lakes, rivers and estuaries
-_-JLNI 0 Location of forest vegetation along the streams, ponds, lakes
rivers and
,
estuaries
Variance Request Form, page 5
Version 1 July 2009
October 19, 2010
North Carolina Division of Water Quality
401/Wetlands Unit
2321 Crabtree Blvd, Suite 250
Raleigh, North Carolina 27604 Amicus Ingineering
Reference: Storm Water Management Narrative Sustainable Systems Design & Development
Proposed Professional Building at Lawyers Road D =?
Stallings, North Carolina
Parcel ID: 08324002
Project Number: 17-10-033 OC T 2 7LO?p
NCDENR Job Number: 10-073 5 DENR • WATER OUAUTY
WEX4W AND STORMWATER BRANCH
Mrs. Chapman:
On behalf of Mr. and Mrs. Kevin Bigham, Amicus Engineering, PC (Amicus) is pleased to
submit this project narrative per your request. This narrative will describe, in detail, the
post-construction storm water management plan developed for the proposed project at
Lawyers Road that was designed to accommodate the requirements set forth by "Manual of
Storm Water Best Management Practices," per the North Carolina Department of
Environment and Natural Resources and "Post Construction Ordinance for Phase II
Stormwater," per the Town of Stallings, North Carolina.
Layout:
The proposed development at Lawyers Road will consist of a 9,462 sq. ft. multi-tenant
office building with supporting parking and infrastructure. The project will disturb roughly
2.36 acres out of a possible 10.82 acres. The site is bordered to the east and west by existing
residential developments and to the north by Emerald Lakes golf course. The majority of
the site is heavily wooded with moderate topography. The site features a man-made pond at
the southern end of the site and an intermittent drainage feature that bisects the property at a
location north of the pond. The pond has a surface area of roughly 1.25-acres with a
maximum depth of 7-feet. There is no formal outflow structure as runoff tops the pond
embankment during heavy storm events. The drainage feature or creek starts at the subject
property line and conveys storm water runoff from the adjacent residential development to
?` `
+-
the west and the commercial development located across Lawyers Road. It shall be noted
that the pond is completely disconnected from the aforementioned creek.
The proposed layout of the site was based on minimizing the construction impact of the 100'
riparian buffer and converting the existing man-made pond to an extended dry detention
basin with a formal outlet control structure. The proposed professional building, parking lot,
and maneuvering areas were situated towards the front of the property where the site had
previously been cleared. No building, parking, or water quality structure was sited within
the 100-foot buffer. The impact to the previously cleared portion of the buffer was limited
to structural fill and the construction of the outlet control structure.
Conveyance:
The proposed professional building, parking lot, and maneuvering areas were sited to direct
all post-construction runoff via sheet flow to two bypass structures. The first inch of runoff
is directed to the two bioretention structures for treatment. Any storm events greater than
the 1St inch is bypassed to the extended dry detention basin. The proposed overflow
structure, which was designed to maintain pre-developed flow conditions up to the 50-yr
storm, then conveys the treated and controlled runoff to a outflow control structure upstream
of the creek.
Treatment and Volume Control:
The treatment of the site's runoff is provided by two structural Best Management Practices
or BMP's. In this case, the BMP's are bioretention structures located at opposite ends of the
parking lot. The structures were designed to treat and control the 0 inch for water quality in
accordance with the design guidelines and practices provided by the most current version of
the North Carolina Best Management Practices Manual. Treatment of the larger storm
events is being provided, to a smaller degree, by the extended dry detention structure located
downstream of the two bioretention structures. The extended dry detention structure and
corresponding overflow structure were designed to maintain pre-developed flow conditions
for the 1-year, 24-hour; 10-year, 6-hour; 25-year, 6-hour; and the 50-year 24-hour storm
events.

Amicus Engineering, PC (Amicus) hopes the following narrative adequately explains and
justifies our design of the storm water management system for the proposed professional
building at Lawyers Road in Stallings, North Carolina. Should any question or comments
about this arise during your review, please contact me at [phone] prior to requesting
changes and another submittal. Thank you for your cooperation.
Sincerely,
Jeff Mc tyre
Project Manager
October 19, 2010
North Carolina Department of Environment and Natural Resources
Division of Water Quality
401 /Wetlands Unit
2321 Crabtree Blvd, Suite 250
Raleigh, North Carolina 27604
Reference:
Proposed Activity Narrative
Proposed Professional Building at Lawyers Road
Stallings, North Carolina
Parcel ID: 08324002
NCDENR Job Number: 10-0735
Project Number: 17-10-033
Mrs. Chapman:
OCT 2 7 ZOt0
wEP,}'MS Mo srORM° T'R IU"
On behalf of Mr. and Mrs. Kevin Bigham, Amicus Engineering, PC (Amicus) is pleased to
submit this proposed activity narrative per your request. This narrative will describe, in
detail, Questions number three and five under Part 2 (Proposed Activity) of the Variance
Request Form for Major Variances in the Goose Creek Watershed.
3. State reasons why this plan for the proposed activity cannot be practically
accomplished, reduced, or reconfigured to better minimize or eliminate disturbance
to the riparian buffer:
The proposed development at Lawyers Road will consist of a proposed 9,462 sq. ft. medical
office building and a future 4,899 sq. fit medical office building with supporting parking and
infrastructure. The size and shape of the proposed building is based on the property owners
immediate business needs as a medical office. The future building is based on probable
future expansion needs. The building shapes were modified at the forefront of the
preliminary design phase to fit the necessary building size, required supporting parking and
infrastructure into the site, between the required front setback and the 100-ft riparian buffer.
The layout of the site is constricted to the driveway locations mandated by the Town of
Stallings and the North Carolina Department of Transportation. The western driveway must
be located directly across from the driveway into the existing shopping center across
Amicus f n ineerin
g g
Sustainable Systems Design & Development

r,
Lawyers Roads. The eastern driveway had to be located a specific distance away from the
western driveway to accommodate stem length requirements.
The encroachment into the riparian buffer (as currently shown) is limited to an area that is
currently a man-made pond and is only for the grade out of structural fill material. No
permanent structures, parking, or water quality structures are being proposed within the
buffer. No existing trees within the riparian buffer are being removed.
5(1). Please provide an explanation of the practical difficulties or hardships that would
result from the strict application of this Rule.
The strict application of this rule, along with the required setbacks and site constraints,
would require the property owner to limit the size of the building to a square footage that
would not support the size of the existing medical practice or allow for any future
expansion. The aforementioned also limit the property owner from using the existing man
made pond as an extended dry detention structure which would certainly provide additional
water quality. It was our intent to drain the pond and use the existing depression as storage
for the detention of the one thru 50 year, 24-hour storm events. Should the pond not be
available for required detention, an underground detention structure would be necessary and
costs would limit us to design that structure for just the 10 year, 24-hour storm event.
5(2). Please provide an explanation of how these difficulties or hardships result from
conditions that are unique to the property involved
The subject property and the probable uses and layouts are constrained by local zoning
requirements and an existing manmade pond. From a construction standpoint, the building
should be ideally located on the western side of the property. The eastern side of the
property would require the most structural fill on top of the deepest portion of the existing
pond. Unfortunately, the eastern side of the property is also the narrowest. It is possible to
limit the need for encroachment into the riparian buffer; however, this would require the
construction of a very long retaining wall. It shall be noted that the impact into the existing
buffer is limited to an area previously occupied by a man-made pond. The impact would
not result in the removal or damage of any existing trees or shrubs. Mitigation is being
r
proposed that would greatly increase the width and density of the existing riparian buffer on
the north side of the pond.
5(3). If economic hardship is the major consideration, then include a specific explanation
of the economic hardships and the proportion of the hardship to the entire value of
the project.
Economic hardship may be considered a major consideration as the construction of a
retaining wall would be required if the variance is not approved. This retaining wall would
have to be designed to support a considerable surcharge pressure and at nearly 400-feet
long, the costs could be $100,000 or more. In addition, an underground detention system
could result in another $50,000 in capital. This results in a net 10% increase in the overall
cost of the project.
Amicus Engineering, PC (Amicus) hopes the following narrative adequately explains and
justifies our variance required for proposed professional building at Lawyers Road in
Stallings, North Carolina. Should any question or comments about this arise during your
review, please contact us at [phone]. Thank you for your cooperation.
Sincerely,
Jeff Mc tyre
Project Manager

Nicholas R. Parker, P.E.
Senior Reviewer
Permit Number:
(to be provided by DWQ)
Drainage Area Number:_
Bioretention Operation and Maintenance Agreement
I will keep a maintenance record on this BMP. This maintenance record will be kept in a
log in a known set location. Any deficient BMP elements noted in the inspection will be
corrected, repaired or replaced immediately. These deficiencies can affect the integrity
of structures, safety of the public, and the removal efficiency of the BMP.
Important operation and maintenance procedures:
- Immediately after the bioretention cell is established, the plants will be watered
twice weekly if needed until the plants become established (commonly six
weeks).
- Snow, mulch or any other material will NEVER be piled on the surface of the
bioretention cell.
- Heavy equipment will NEVER be driven over the bioretention cell.
- Special care will be taken to prevent sediment from entering the bioretention cell.
- Once a year, a soil test of the soil media will be conducted
.
After the bioretention cell is established, I will inspect it once a month and within 24 Q
hours after every storm event greater than 1.0 inches (or 1.5 inches if in a Coastal
County). Records of operation and maintenance will be kept in a known set location
and
ill b
w
e available upon request.

Inspection activities shall be performed as follows. Any problems that are found shall
b o
e repaired immediately.

BMP element: Potential roblems: How I will remediate the roblem:
The entire BMP Trash/debris is
t
resen
. Remove the trash/debris.
The perimeter of the Areas of bare soil and/or Regrade the soil if necessary to
bioretention cell erosive gullies have formed. remove the
gully, and then plant a
ground cover and water until it is
established. Provide lime and a
one-time fertilizer application.
The inlet device: pipe, The pipe is clogged (if Unclog the pipe. Dispose of the
stone verge or swale a licable). sediment off-site.
The pipe is cracked or Replace the pipe.
otherwise damaged (if
applicable).
Erosion is occurring in the Regrade the swale if necessary to
swale (if applicable). smooth it over and provide erosion
control devices such as reinforced
turf matting or riprap to avoid
future problems with erosion.
Stone verge is clogged or Remove sediment and clogged
covered in sediment (if stone and replace with clean stone
.
a licable).
Form SW401-Bioretention O&M-Rev.3 Page 1 of 4
BMP element:
The pretreatment area Potential roblems:
Flow is b
i How I will remediate the roblem:
ypass
ng Regrade if necessary to route all
pretreatment area and/or flow to the pretreatment area.
llies have formed. Restabilize the area after adm*
.
Sediment has accumulated to Search for the source of the
a depth greater than three sediment and remedy the problem if
inches. possible. Remove the sediment and
restabilize the pretreatment area.
Erosion has occurred. Provide additional erosion
protection such as reinforced turf
matting or riprap if needed to
prevent future erosion problems.
Weeds are present. Remove the weeds, preferably by

The bioretention cell:
Best professional practices hand.
Prune according to best professional
vegetation show that pruning is needed practices.
to maintain optimal plant
health.
Plants are dead, diseased or Determine the source of the
dying. problem: soils, hydrology, disease,
etc. Remedy the problem and
replace plants. Provide a one-time
fertilizer application to establish the
ground cover if a soil test indicates

Tree stakes/wires are present it is necessary.
Remove tree stake/wires (which

The bioretention cell: six months after planting.
Mulch is breaking down or can kill the tree if not removed).
S
ot mulch if th

soils and mulch
has floated away. p
ere are only random
void areas. Replace whole mulch
layer if necessary. Remove the
remaining much and replace with
triple shredded hard wood mulch at

Soils and/or mulch are a maximum depth of three inches.
Determine the extent of the clo
in

clogged with sediment. gg
g
- remove and replace either just the
top layers or the entire media as
needed. Dispose of the spoil in an
appropriate off-site location. Use
triple shredded hard wood mulch at
a maximum depth of three inches.
Search for the source of the
sediment and remedy the problem if
possible.
An annual soil test shows that _
Dolomitic lime shall be applied as
pH has dropped or heavy recommended per the soil test and
metals have accumulated in toxic soils shall be removed

the soil media. ,
disposed of properly and replaced
with new lantin media.
Form SW401-Bioretention O&M-Rev.3
Page 2 of 4
BMP element:
The underdrain system
(if applicable)
The drop inlet
The receiving water
Potential problems:
Clogging has occurred
Clogging has occurred
The drop inlet is
Erosion or other signs of
damage have occurred at the
outlet.
How I will remediate the problem:
Wash out the underdrain system.
Clean out the drop inlet. Dispose of
the sediment off-site.
or replace the drop inlet.
Contact the NC Division of Water
Quality 401 Oversight Unit at 919-
733-1786.
Form SW401-Bioretention O&M-Rev.3
Page 3 of 4
Permit Number:
(to be provided by DWQ)
I acknowledge and agree by my signature below that I am responsible for the
performance of the maintenance procedures listed above. I agree to notify DWQ of any
problems with the system or prior to any changes to the system or responsible party.
Project name:

C-2S lzo-L
BMP drainage area number:
Print name: /: o y\ I >l C7
Title: (L lAE-
Address: ` /-00 sal S UVt t cam-,cq T ?{?JS 1/? L 2$? Cam-(
Phone: -?Oz-(- ecI ? - OL U
X Signature:
Date: /Q - J (- 70 t O
Note: The legally responsible party should not be a homeowners association unless more than 50% of
the lots have been sold and a resident of the subdivision has been named the president.
?1, 1. , a Notary Public for the State of __LD) N N-+ AV, V?QC ,County of RQ4JQ , do hereby certify that
l?U c nti
L? ?- n0,--rte personally appeared before me this
day of 0C: \ail- , --)-D 1 , and acknowledge the due execution of the
forgoing bioretention maintenance requirements. Witness my hand and official seal,
OVA
OvEp'
6p
"Is
O¢ A_Y
L
0 C-i
I Jam, ?e?
a
?es??ry IV CQ? ®9`
o°OFenaa?ce'ti??®
SEAL
My commission expires rw
Form SW401-Bioretention I&M-Rev. 2 Page 4 of 4
Permit Number:
(to be provided by DWQ)
Drainage Area Number: Z
Bioretention Operation and Maintenance Agreement
I will keep a maintenance record on this BMP. This maintenance record will be kept in a
log in a known set location. Any deficient BMP elements noted in the inspection will be
corrected, repaired or replaced immediately. These deficiencies can affect the integrity
of structures, safety of the public, and the removal efficiency of the BMP.
Important operation and maintenance procedures:
- Immediately after the bioretention cell is established, the plants will be watered
twice weekly if needed until the plants become established (commonly six
weeks).
- Snow, mulch or any other material will NEVER be piled on the surface of the
bioretention cell.
- Heavy equipment will NEVER be driven over the bioretention cell.
- Special care will be taken to prevent sediment from entering the bioretention cell.
- Once a year, a soil test of the soil media will be conducted.
After the bioretention cell is established, I will inspect it once a month and within 2
hours after every storm event greater than 1.0 inches (or 1.5 inches if in a Coastal
County). Records of operation and maintenance will be kept in a known set location C
and will be available upon request. $
Inspection activities shall be performed as follows. Any problems that are found shall ?)
be repaired immediately. Qg!o
BMP element: Potential problems: How I will remediate the roblem:
The entire BMP Trash/debris is resent. Remove the trash/ debris.
The perimeter of the Areas of bare soil and/or Regrade the soil if necessary to
bioretention cell erosive gullies have formed. remove the gully, and then plant a
ground cover and water until it is
established. Provide lime and a

The inlet device: pipe,
The pipe is clogged (if one-time fertilizer application.
Unclog the pipe. Dispose of the
stone verge or swale applicable). sediment off-site.
The pipe is cracked or Replace the pipe.
otherwise damaged (if
applicable).
Erosion is occurring in the Regrade the swale if necessary to
swale (if applicable). smooth it over and provide erosion
control devices such as reinforced
turf matting or riprap to avoid
future problems with erosion.
Stone verge is clogged or Remove sediment and clogged
covered in sediment (if stone and replace with clean stone.
a licable .
Form SW401-Bioretention O&M-Rev.3 Page 1 of 4

I
BMP element: Potential problems: How I will remediate the roblem:
The pretreatment area Flow is bypassing Regrade if necessary to route all
pretreatment area and/or flow to the pretreatment area.
llies have formed. Restabilize the area after adin .
Sediment has accumulated to Search for the source of the
a depth greater than three sediment and remedy the problem if
inches. possible. Remove the sediment and
restabilize the pretreatment area.
Erosion has occurred. Provide additional erosion
protection such as reinforced turf
matting or riprap if needed to
prevent future erosion problems.
Weeds are present. Remove the weeds, preferably by
hand.
The bioretention cell: Best professional practices Prune according to best professional
vegetation show that pruning is needed practices.
to maintain optimal plant
health.
Plants are dead, diseased or Determine the source of the
dymg• problem: soils, hydrology, disease,
etc. Remedy the problem and
replace plants. Provide a one-time
fertilizer application to establish the
ground cover if a soil test indicates
it is necessary.
Tree stakes/ wires are present Remove tree stake/ wires (which

The bioretention cell: six months after planting.
Mulch is breaking down or can kill the tree if not removed).
Spot mulch if there are only random
soils and mulch has floated away. void areas. Replace whole mulch
layer if necessary. Remove the
remaining much and replace with
triple shredded hard wood mulch at
a maximum depth of three inches.
Soils and/or mulch are Determine the extent of the clogging
clogged with sediment. - remove and replace either just the
top layers or the entire media as
needed. Dispose of the spoil in an
appropriate off-site location. Use
triple shredded hard wood mulch at
a maximum depth of three inches.
Search for the source of the
sediment and remedy the problem if
possible.
An annual soil test shows that Dolomitic lime shall be applied as
pH has dropped or heavy recommended per the soil test and
metals have accumulated in toxic soils shall be removed

the soil media. ,
disposed of properly and replaced
with new lantin media.
Form S W40 ] -Bioretention O&M-Rev.3
Page 2 of 4
BMP element:
The underdrain system
(if applicable)
The drop inlet
The receiving water
Potential problems:
Clogging has occurred.
Clogging has occurred
The drop inlet is
Erosion or other signs of
damage have occurred at the
outlet.
How I will remediate the proble
Wash out the underdrain system.
Clean out the drop inlet. Dispose of
the sediment off-site.
or replace the drop inlet.
Contact the NC Division of Water
Quality 401 Oversight Unit at 919-
733-1786.
Form SW401-Bioretention O&M-Rev.3
Page 3 of 4
Permit Number:
(to be provided by DWO)
I acknowledge and agree by my signature below that I am responsible for the
performance of the maintenance procedures listed above. I agree to notify DWQ of any
problems with the system or prior to any changes to the system or responsible party.
Project name:?OPM C-5) ?2 SS i c7?n+q c- 11
BMP drainage area number: 2-
Print name:.l
Title: ?GJVIt?
Address: 7??v -1IC S LV(1ct-
Phone:. 7C'y/- R'c? O
-Y Signature:
Dater - (f-- 2 d k O
KA
L?WSc-P-s i?&kt7S
ews , (A-C- - 8V o q
Note: The legally responsible party should not be a homeowners association unless more than 50% of
the lots have been sold and a resident of the subdivision has been named the president.
I' - -° Ok ) ?? , a Notary Public for the State of
C60 &( ltG , County of do hereby certify that
6y-\ personally appeared before me this
y ?C A6 \3
day of ?-
?Q IU i) , and acknowledge the due execution of the
forgoing bioretention maintenance requirements. Witness my hand and official seal,
?t??ae€,¢??aaao8a
®O cam.OVECTO If,®
COUO.
SEAL
My commission expires
Form SW401-Bioretention I&M-Rev. 2
Page 4 of 4
Permit No:
(to be assigned by DWQ)
III.. REQUIRED ITEMS CHECKLIST
Please indicate the page or plan sheet numbers where the supporting documentation can be found. An incomplete submittal package will
result in a request for additional information. This will delay final review and approval of the project. Initial in the space provided to
indicate the following design requirements have been met. If the applicant has designated an agent, the agent may initial below. If a
requirement has not been met, attach justification.
10
Pagel Plan
Initials Sheet No.
L 1. Plans (1" - 50' or larger) of the entire site showing:
7, D Design at ultimate build-out,
Off-site drainage (if applicable),
C_ ( Delineated drainage basins (include Rational C coefficient per basin),
Cell dimensions,
Pretreatment system, - Kf o
- 5-d High flow bypass system,
k Maintenance access, _ u
r_( Recorded drainage easement and public right of way (ROW), (bdo1 ?,T- r?
LW Of b t?
C-,j: o Clean out pipe locations,
Overflow device, and
G_ - Boundaries of drainage easement.
{d/? C- tit ' d 2. Plan details (1" = 30' or larger) for the bioretention cell showing:
Cell dimensions
Pretreatment system, -V t64
High flow bypass system,
Maintenance access,
Recorded drainage easement and public right of way (ROM, ??
Design at ultimate build-out,
Off-site drainage (if applicable),
Clean out pipe locations,
Overflow device, and
Boundaries of drainage easement.
J x Indicate the P-Index between 10 and 30
3. Section view of the bioretention cell (1" = 20' or larger) showing:
Side slopes, 3:1 or lower
Underdrain system (if applicable), and
Bioretention cell layers [ground level and slope, pre-treatment, ponding depth, mulch depth, fill media
depth, washed sand, filter fabric (or choking stone if applicable), #57 stone, underdrains (if applicable),
SHWT level(s), and overflow structure]
JI-JLA C' o 4. A soils report that is based upon an actual field investigation, soil borings, and infiltration tests. The
results of the soils report must be verified in the field by DWQ, by completing & submitting the soils
investigation request form. County soil maps are not an acceptable source of soils information. All
elevations shall be in feet mean sea level (fmsl). Results of soils tests of both the planting soil and the in
situ soil must include:
Soil permeability,
Soil composition (% sand, % fines, % organic), and
P-index.
0 --VA C)
5. A detailed planting plan (1" = 20' or larger) prepared by a qualified individual showing:
A variety of suitable species,
Sizes, spacing and locations of plantings,
Total quantity of each type of plant specified,
A planting detail,
The source nursery for the plants, and
Fertilizer and watering requirements to establish vegetation.
C-k-a
6. A construction sequence that shows how the bioretention cell will be protected from sediment until the
entire drainage area is stabilized.
f 1 Ll? ?>7S 7. The supporting calculations (including underdrain calculations, if applicable).
8. A copy of the signed and notarized inspection and maintenance (I&M) agreement.
J_? v r< <+''?T' 9. A copy of the deed restriction.
Form SW401-Bioretention-Rev.7
Part III, Page 1 of 1
Permit No:
(to be assigned by DWQ)
llL REQUIRED ITEMS CHECKLIST
Please indicate the page or plan sheet numbers where the supporting documentation can be found. An incomplete submittal package will
result in a request for additional information. This will delay final review and approval of the project Initial in the space provided to
indicate the following design requirements have been met. If the applicant has designated an agent, the agent may initial below. If a
requirement has not been met, attach justification. 2
Initials

JtAA
X-VX
JLV.A
J?
It l d t >_
Pagel Plan
Sheet No.
1. Plans (1' - 50' or larger) of the entire site showing:
Design at ultimate build-out,
Off-site drainage (if applicable),
C_ ( Delineated drainage basins (include Rational C coefficient per basin),
p Cell dimensions,
Pretreatment system, - ?'(?+4
C High flow bypass system, F
_'i". k Maintenance access,
IC_ 4%-_( - Recorded drainage easement and public right of way (ROW), ?ylol T L
C-5! U Clean out pipe locations,
C _ 6-0 - Overflow device, and
\ Boundaries of drainage easement.
C- N ' a 2. Plan details (1' = 30' or larger) for the bioretention cell showing:
Cell dimensions
Pretreatment system, -V t§
High flow bypass system,
Maintenance access,
oP??
Recorded drainage easement and public right of way (ROW), (Y
Design at ultimate build-out,
Off-site drainage (if applicable),
Clean out pipe locations,
Overflow device, and
Boundaries of drainage easement.
Indicate the P-Index between 10 and 30
0 3. Section view of the bioretention cell (1" = 20' or larger) showing:
Side slopes, 3:1 or lower
Underdrain system (if applicable), and
Bioretention cell layers [ground level and slope, pre-treatment, ponding depth, mulch depth, fill media
depth, washed sand, filter fabric (or choking stone if applicable), #57 stone, underdrains (if applicable),
SHWT level(s), and overflow structure]
/- ki
(-1`i' 0
C-10 -
H.3
ftrmw&

4. A soils report that is based upon an actual field investigation, soil borings, and infiltration tests. The
results of the soils report must be verified in the field by DWQ, by completing & submitting the soils
investigation request form. County soil maps are not an acceptable source of soils information. All
elevations shall be in feet mean sea level (fmsl). Results of soils tests of both the planting soil and the in
situ soil must include:
Soil permeability,
Soil composition (% sand, % fines, % organic), and
P-index.
5. A detailed planting plan (1' = 20' or larger) prepared by a qualified individual showing:
A variety of suitable species,
Sizes, spacing and locations of plantings,
Total quantity of each type of plant specified,
A planting detail,
The source nursery for the plants, and
Fertilizer and watering requirements to establish vegetation.
6. A construction sequence that shows how the bioretention cell will be protected from sediment until the
entire drainage area is stabilized.
7. The supporting calculations (including underdrain calculations, if applicable).
8. A copy of the signed and notarized inspection and maintenance (I&M) agreement.
9. A copy of the deed restriction.
Form SW401-Bioretention-Rev.7 Part III, Page 1 of 1