20110156 Ver 1_Stormwater Info_20110609

015(
Baker
THE
LPAR-PA
GROUP
TRANSPORTATION CONSULTANTS
A unit o} MkAo[t Solar Corporation
Michael Baker Engineering, Inc.
THE LPA GROUP of North Carolina
A Unit of Michael Baker Corporation
7800 Airport Center Drive, Suite 100
Greensboro, NC 27409
336-931-1500
FAX [phone]
June 8, 2011
Ms. Annette M. Lucas, PE, Environmental Engineer
N.C. Department of Environment and Natural Resources
Division of Water Quality
Wetlands and Stormwater Branch
512 N. Salisbury St, 9th Floor
Raleigh, NC 27604
Re: Mount Airy - Surry County Airport
Holly Springs Road Relocation
Dear Ms. Lucas,
J@@@flW7@M
JUN 0 9 2011
?ANp MRMVy ij WCH
For your review and comment, please find enclosed the following:
• One (1) copy of the Stormwater Management Permit Application Form
• One (1) copy of the detailed narrative, calculations, and other requested
information.
• One (1) copy of Stormwater Management Plan plansheets
If you have any questions or need additional information, please feel free to call.
Sincerely,
THE LPA GROUP of North Carolina
A Unit of Michael Baker Engineering, Inc.
?vffimothy S. Kennerly, P.E.
Project Engineer
Enclosures
DWQ USE ONLY
Date Received Fee Paid Permit Number

Applicable Rules: ? Coastal SW -1995 ? Coastal SW - 2008 ? Ph II - Post Construction
(select all that apply) ? Non-Coastal SW- HQW/ORW Waters ? Universal Stormwater Management Plan
? Other WQ M mt Plan:
State of North Carolina
Department of Environment and Natural Resources
Division of Water Quality
STORMWATER MANAGEMENT PERMIT APPLICATION FORM
This form may be photocopied for use as an original
1. GENERAL INFORMATION
1. Project Name (subdivision, facility, or establishment name - should be consistent with project name on plans,
specifications, letters, operation and maintenance agreements, etc.):
Mount Airy Airport - Holly Springs Road Relocation
2. Location of Project (street address):
Mount Airy Airport, 146 Howard Woltz Jr. Way
City:Mount Airy County:Surry Zip:27030
3. Directions to project (from nearest major intersection):
Take I-40 W toward US-421 N/WINSTON-SALEM. Take exit #206/KERNERSVILLE/WINSTON-SALEM
DOWNTOWN onto US-421 N. Continue on US-158 W. Take exit #6B /MOUNT ALRY/SMITH REYNOLDS
AIRPORT/AIRPORT onto US-52 N. Take exit #141 /HOLLY SPRINGS CHURCH RD. Turn Right on HOLLY
SPRINGS RD. Turn Right on AIRPORT RD. Turn Left on HOWARD WOLTZ IR WAY. Arrive at 146
HOWARD WOLTZ IR WAY, MOUNT AIRY.
4. Latitude:36 deg° 46'98" N Longitude:80 deg° 55'46" W of the main entrance t e proje nv
II. PERMIT INFORMATION: `-
C
Z
1. a. Specify whether project is (check one): ®New ?Modification
M
b. If this application is being submitted as the result of a modification to an existing permit, list th jg"Ustuw
permit number , its issue date (if known) and the status NO
construction: ?Not Started ?Partially Completed* ? Completed* *provide a design s cert;5?Watio?
2. Specify the type of project (check one): r??
®Low Density ?High Density ?Drains to an Offsite Stormwater System ?Other
3. If this application is being submitted as the result of a previously returned application or a letter from DWQ
requesting a state stormwater management permit application, list the stormwater project number, if
assigned, N/A and the previous name of the project, if different than currently
proposed,
4. a. Additional Project Requirements (check applicable blanks; information on required state permits can be
obtained by contacting the Customer Service Center at 1-877-623-6748):
?CAMA Major ®Sedimentation/Erosion Control: 89.0 ac of Disturbed Area
ONPDES Industrial Stormwater ®404/401 Permit: Proposed Impacts 0.70 AC Wetlands 3,6341f Streams
b. If any of these permits have already been acquired please provide the Project Name, Project/Permit Number,
issue date and the type of each permit:Mt. Airy Airport - Holly Springs Road Relocation Surry-2011-022
Issued 5/23/11, Land Quality Permit
Form SWU-101 Version 07Jun2010 Page 1 of 6
III. CONTACT INFORMATION
1. a. Print Applicant / Signing Official's name and title (specifically the developer, property owner, lessee,
designated government official, individual, etc. who owns the project):
Applicant/Organization: Mount Airy-Surr Cy ounty Airport Authority
Signing Official & Title:Mr. Tohn Springthorpe, III - Chairman
b. Contact information for person listed in item 1a above:
Street Address:c/o SouthData Incorporated, 201 Technology Lane
City:Mount Airy State:NC Zip:27030
Mailing Address (if applicable):
City:
Phone: (336 ) 719-5000 x 3110
State:
Fax: (3 36 ) 789-4143
Email:[e-mail]
c. Please check the appropriate box. The applicant listed above is:
® The property owner (Skip to Contact Information, item 3a)
? Lessee* (Attach a copy of the lease agreement and complete Contact Information, item 2a and 2b below)
? Purchaser* (Attach a copy of the pending sales agreement and complete Contact Information, item 2a and
2b below)
? Developer* (Complete Contact Information, item 2a and 2b below.)
2. a. Print Property Owner's name and title below, if you are the lessee, purchaser or developer. (This is the
person who owns the property that the project is located on):
Property Owner/Organization:
Signing Official &
b. Contact information for person listed in item 2a above:
Street Address:
City:
Mailing Address (if applicable):
City:
Phone:
State: Zip:
State:
Fax:
Zip:
3. a. (Optional) Print the name and title of another contact such as the project's construction supervisor or other
person who can answer questions about the project:
Other Contact Person/Organization:Timothy S. Kennerlv P. E. THE LPA GROUP a Unit of Michael Baker Eng
Signing Official & Title:Timothy S. Kennerlv. P. E. Project Engineer
b. Contact information for person listed in item 3a above:
Mailing Address:7800 Airport Center Drive, Suite 100
City:Greensboro State:NC Zip:27409
Phone: (336 ) 931-1500
Email:[e-mail]
Fax: (336 ) 931-1501
4. Local jurisdiction for building permits:
Point of Contact: Phone #:
Form SW-U-101 Version 07fun2010 Page 2 of 6
IV. PROJECT INFORMATION
1. In the space provided below, briefly summarize how the stormwater runoff will be treated.
The stormwater runoff from the road relocation will be treated with Dry Detention Basins for 1" rainfall over
the impervious area. The Runway-Taxiway Extension will be treated by a Wet Pond for the 1 yr-24 Strom
event. The Taxiway A South Extension will be treated by grass swales and a dry detention basin with a
forebay for the 1 yr-24 hour strom event. The Future Development will also be treated by wet pond
expanding the wet pond for the runway/taxiway extension. All measures will pass the 10 yr storm event
2. a. If claiming vested rights, identify the supporting documents provided and the date they were approved:
? Approval of a Site Specific Development Plan or PUDApproval Date:
? Valid Building Permit Issued Date:
? Other: Date:
b. If claiming vested rights, identify the regulation(s) the project has been designed in accordance with:
? Coastal SW -1995 ? Ph II - Post Construction
3. Stormwater runoff from this project drains to the Yadkin-PeeDEE River basin.
4. Total Property Area: 101 acres
5. Total Coastal Wetlands Area: acres
6. Total Surface Water Area: acres
7. Total Property Area (4) - Total Coastal Wetlands Area (5) - Total Surface Water Area (6) = Total Project Area':
101 acres
Total project area shall be calculated to exclude the following: the normal pool of impounded structures, the area
between the banks of streams and rivers, the area below the Normal High Water (NHW) line or Mean High Water
(MHW) line, and coastal wetlands landward from the NHW (or MHW) line. The resultant project area is used to
calculate overall percent built upon area (BUA). Non-coastal wetlands landward of the NHW (or MHW) line may be
included in the total project area.
8. Project percent of impervious area: (Total Impervious Area / Total Project Area) X 100 = 50 %
9. How many drainage areas does the project have?6 (For high density, count 1 for each proposed engineered
stormwater BMP. For low density and other projects, use 1 for the whole property area)
10. Complete the following information for each drainage area identified in Project Information item 9. If there
are more than four drainage areas in the project, attach an additional sheet with the information for each area
provided in the same format as below.
Basin Information Drainage Area _ Draina e Area _ Drainage Area _ Drainage Area _
Receiving Stream Name See Attached
Stream Class *
Stream Index Number
Total Drainage Area (sf)
On-site Drainage Area (sf)
Off-site Drainage Area (sf)
Proposed Impervious Area** (sf)
% Impervious Area** (total)
Impervious" Surface Area Drainage Area _ Drainage Area _ Drainage Area _ Drainage Area _
On-site Buildings/Lots (sf)
On-site Streets (sf)
On-site Parking (sf)
On-site Sidewalks (sf)
Other on-site (sf)
Future (sf)
Off-site (sf)
Existing BUA*** (sf)
Total (sf):
Stream Class and index Number can be determined at: http://portal.ncdenr.or /web/wq/ps/csic%lassifications
Form SWU-101 Version 07Jun2010 Page 3 of 6
1m envious area is defined as the built upon area including, but not limited to, buildings, roads, parking areas,
sidewalks, gravel areas, etc.
*** Report only that amount of existing BUA that will remain after development. Do not report any existing B UA that is
to be removed and which will be replaced by new BUA.
11. How was the off-site impervious area listed above determined? Provide documentation. N/A
Proiects in Union County: ContactDWQ Central Office staff to check if the project is located within a Threatened &
Endangered Species watershed that may be subject to more stringent stormwater requirements as per NCAC 02B. 0600.
V. SUPPLEMENT AND O&M FORMS
The applicable state stormwater management permit supplement and operation and maintenance (O&M) forms
must be submitted for each BMP specified for this project. The latest versions of the forms can be downloaded
from httD: / /i)ortal.ncdenr.or?--/web/wci/ws/su/bmi)-manual.
VI. SUBMITTAL REQUIREMENTS
Only complete application packages will be accepted and reviewed by the Division of Water Quality (DWQ).
A complete package includes all of the items listed below. A detailed application instruction sheet and BMP
checklists are available from http://12ortal.ncdenr.org/web/wq/ws/su/statesw/forms docs. The complete
application package should be submitted to the appropriate DWQ Office. (The appropriate office may be
found by locating project on the interactive online map at http: / /portal.ncdenr.org/web/wq/ws /su/maps.)
Please indicate that the following required information have been provided by initialing in the space provided
for each item. All original documents MUST be signed and initialed in blue ink. Download the latest versions
for each submitted application package from http://portal.ncdenr.org/web/wa/ws/su/statesw/forms docs.
IT* tials
1. Original and one copy of the stormwater Management Permit Application Form.
?k
2. Original and one copy of the signed and notarized Deed Restrictions & Protective Covenants 4-0-4
Form. (if required as per Part VII below)
3. Original of the applicable Supplement Form(s) (sealed, signed and dated) and O&M
agreement(s) for each BMP.
4. Permit application processing fee of $505 payable to NCDENR. (For an Express review, refer to
httl2://www.envhelp.org/12ages/-onestol2express.html for information on the Express program
and the associated fees. Contact the appropriate regional office Express Permit Coordinator for
additional information and to schedule the required application meeting.)
5. A detailed narrative (one to two pages) describing the stormwater treatment/management for
the project. This is required in addition to the brief summary provided in the Project
Information, item 1.
6. A USGS map identifying the site location. If the receiving stream is reported as class SA or the
receiving stream drains to class SA waters within 1/z mile of the site boundary, include the 1/2
mile radius on the map.
7. Sealed, signed and dated calculations.
8. Two sets of plans folded to 8.5" x 14" (sealed, signed, & dated), including:
a. Development/Project name.
b. Engineer and firm.
c. Location map with named streets and NCSR numbers.
d. Legend.
e. North arrow.
f. Scale.
g. Revision number and dates.
h. Identify all surface waters on the plans by delineating the normal pool elevation of
impounded structures, the banks of streams and rivers, the MHW or NHW line of tidal
waters, and any coastal wetlands landward of the MHW or NHW lines.
• Delineate the vegetated buffer landward from the normal pool elevation of impounded
structures, the banks of streams or rivers, and the MHW (or NHW) of tidal waters.
i. Dimensioned property/project boundary with bearings & distances.
j. Site Layout with all BUA identified and dimensioned.
k. Existing contours, proposed contours, spot elevations, finished floor elevations.
1. Details of roads, drainage features, collection systems, and stormwater control measures.

Form SWU-101 Version 07Jun2010 Page 4 of 6
m. Wetlands delineated, or a note on the plans that none exist. (Must be delineated by a
qualified person. Provide documentation of qualifications and identify the person who
made the determination on the plans.
n. Existing drainage (including off-site), drainage easements, pipe sizes, runoff calculations.
o. Drainage areas delineated (included in the main set of plans, not as a separate document).
Ve etated buffers (where re uired)
9
P g q ???c
Copy of any applicable soils report with the associated SHWT elevations (Please identify
elevations in addition to depths) as well as a map of the boring locations with the existing
elevations and boring logs. Include an 8.5"x11" copy of the NRCS County Soils map with the
project area clearly delineated. For projects with infiltration BMPs, the report should also
include the soil type, expected infiltration rate, and the method of determining the infiltration rate.
(Infiltration Devices submitted to WiRO: Schedule a site visit for DWQ to verifij the SHWT prior
to submittal, [phone].)
10.
11.
A copy of the most current property deed. Deed book: Attached Page No:
For corporations and limited liability corporations (LLC): Provide documentation from the NC
Secretary of State or other official documentation, which supports the titles and positions held
by the persons listed in Contact Information, item 1a, 2a, and/or 3a per NCAC 2H.1003(e). The
corporation or LLC must be listed as an active corporation in good standing with the NC
Secretary of State, otherwise the application Will be returned.
http://www.secretary.state.nc.us/Cor.12orations/CSearch.asi2x
VII. DEED RESTRICTIONS AND PROTECTIVE COVENANTS
For all subdivisions, outparcels, and future development, the appropriate property restrictions and protective
covenants are required to be recorded prior to the sale of any lot. If lot sizes vary significantly or the proposed
BUA allocations vary, a table listing each lot number, lot size, and the allowable built-upon area must be provided
as an attachment to the completed and notarized deed restriction form. The appropriate deed restrictions and
protective covenants forms can be downloaded from
htW://portal.ncdenr.org/web/wq/ws/su/statesw/forms docs. Download the latest versions for each submittal.
In the instances where the applicant is different than the property owner, it is the responsibility of the property
owner to sign the deed restrictions and protective covenants form while the applicant is responsible for ensuring
that the deed restrictions are recorded.
By the notarized signature(s) below, the permit holder(s) certify that the recorded property restrictions and
protective covenants for this project, if required, shall include all the items required in the permit and listed
on the forms available on the website, that the covenants will be binding on all parties and persons claiming
under them, that they will run with the land, that the required covenants cannot be changed or deleted
without concurrence from the NC DWQ, and that they will be recorded prior to the sale of any lot.
VIII. CONSULTANT INFORMATION AND AUTHORIZATION
Applicant: Complete this section if you wish to designate authority to another individual and/or firm (such as a
consulting engineer and/or firm) so that they may provide information on your behalf for this project (such as
addressing requests for additional information).
Consulting Engineer:Timothv S. Kennerly. P. E.
Consulting Firm: THE LPA GROUP, a Unit of Michael Baker Engineering Inc
Mailing Address:7800 Airport Center Drive Suite 100
City:Greensboro State:NC Zip:27409
Phone: (336 ) 931-1500 Fax: 1336 ) 931-1501
Email:tskennerly@112agrou:p.com
IX. PROPERTY OWNER AUTHORIZATION (if Contact Information, item 2 has been filled out, complete this
section)
I, (print or type name of person listed in Contact Information, item 2a) , certify that I
own the property identified in this permit application, and thus give permission to (print or type name of person
listed in Contact Information, item 1a) with (print or type name of organization listed in
Contact Information, item 1a) to develop the project as currently proposed. A copy of
the lease agreement or pending property sales contract has been provided with the submittal, which indicates the
party responsible for the operation and maintenance of the stormwater system.

Form SWU-101 Version 07Jun2010 Page 5 of 6
As the legal property owner I acknowledge, understand, and agree by my signature below, that if my designated
agent (entity listed in Contact Information, item 1) dissolves their company and/or cancels or defaults on their
lease agreement, or pending sale, responsibility for compliance with the DWQ Stormwater permit reverts back to
me, the property owner. As the property owner, it is my responsibility to notify DWQ immediately and submit a
completed Name/Ownership Change Form within 30 days; otherwise I will be operating a stormwater treatment
facility without a valid permit. I understand that the operation of a stormwater treatment facility without a valid
permit is a violation of NC General Statue 143-215.1 and may result in appropriate enforcement action including
the assessment of civil penalties of up to $25,000 per day, pursuant to NCGS 143-215.6.
Da
a Notary Public for the State of . County of
do hereby certify that personally appeared
before me this - day of and acknowledge the due execution of the application for a
stormwater permit. Witness my hand and official seal,
X. APPLICANT'S CERTIFICATION
SEAL
My commission
I, (print or type name of person listed in Contact Information, item 1a) Mr. fohn Springthorpe, III - Chairman
certify that the information included on this permit application form is, to the best of my knowledge, correct and
that the project will be constructed in conformance with the approved plans, that the required deed restrictions
and protective covenants will be recorded, and that the proposed project complies with the requirements of the
applicable ?,tarnypter jhles under 15A NCAC 21-1.1000, SL 2006-246 (Ph. II - Post Construction) or SL 2008-211.
Date: -5-3/- (?
IV Lon ? a Notary Public for the State of .1M y4A 0
`(trrJf ,'ham ,County of
k do hereby certify that :3U hyi 4'Y1 A ?1 `?i?? personally appeared
ow . dge the due execution of the application for
before me this °3 day of ffiav and (7N
stormwater permit. Witness my hand and official seal, ,L(? c
Notary Public
St&%$ County
North Carotin
Commission E4Wrn Jun
2013':
SEAL
My commission expires &-10-d613
Form SWU-101 Version 07Jun2010 Page 6 of 6
i
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1336
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'-'DOLLARS 8 Oe ,
SURREY BANK
BSrust \
Mount Alry, NC 27030 ? r
MEMO ryp
1:0S311 20711:1001 2 2733GO 1336

MOUNT AIRY
SURRY COUNTY AIRPORT AUTHORITY 66-1207/531
146 HOWARD WOLTZ JR. WAY /
MOUNT AIRY, NC 27030 rl E ?U
Basin Information Drainage Area 2 Drainage Area 4 Drainage Area 5
Receiving Stream Name Rutledge Creek Rutledge Creek Rutledge Creek
Stream Class * Trout Trout Trout
Stream Index Number
Total Drainage Area (sf) 2614 5663 5663
On-Site Drainage Area (sf) 2614 5663 5663
Off-Site Drainage Area (sf) 0 0 0
Proposed Impervious Area ** (sf) 2614 5663 5663
% Impervious Area ** (Total) 100.0 100.0 100.0
Impervious ** Surface Area Drainage Area Drainage Area _ Drainage Area
On-Site Building/Lots (sf)
On-Site Streets (sf)
On-Site Parking (sf)
On-Site Sidewalks (sf)
Other On-Site (sf)
Future (sf)
Off-Site (sf)
Existing BUA *** (sf)
Total (sf):
Basin Information Drainage Area 6 Drainage Area 7 Drainage Area 8
Receiving Stream Name Rutledge Creek Rutledge Creek Rutledge Creek
Stream Class * Trout Trout Trout
Stream Index Number
Total Drainage Area (sf) 5227 12,196 43,124
On-Site Drainage Area (sf) 5227 12,196 43,124
Off-Site Drainage Area (sf) 0 0 0
Proposed Impervious Area ** (sf) 5227 12,196 43,124
% Impervious Area ** (Total) 100.0 100.0 100.0
Impervious ** Surface Area Drainage Area Drainage Area _ Drainage Area
On-Site Building/Lots (sf)
On-Site Streets (sf)
On-Site Parking (sf)
On-Site Sidewalks (sf)
Other On-Site (sf)
Future (sf)
Off-Site (sf)
Existing BUA *** (sf)
Total (sf):
Basin Information Drainage Area 9A Drainage Area 9B Drainage Area 10
Receiving Stream Name Rutledge Creek Rutledge Creek Rutledge Creek
Stream Class * Trout Trout Trout
Stream Index Number
Total Drainage Area (sf) 18,730 22,651 20,473
On-Site Drainage Area (sf) 18,730 22,651 20,473
Off-Site Drainage Area (sf) 0 0 0
Proposed Impervious Area ** (sf) 18,730 22,651 20,473
% Impervious Area ** (Total) 100.0 100.0 100.0
Impervious ** Surface Area Drainage Area Drainage Area - Drainage Area
On-Site Building/Lots (sf)
On-Site Streets (sf)
On-Site Parking (sf)
On-Site Sidewalks (sf)
Other On-Site (sf)
Future (sf)
Off-Site (sf)
Existing BUA *** (sf)
Total (sf):
Basin Information Drainage Area
RW - TW Extension Drainage Area
Future Development Drainage Area
TW A South Extension

Receiving Stream Name Rutledge Creek Rutledge Creek Rutledge Creek
Stream Class * Trout Trout Trout
Stream Index Number
Total Drainage Area (sf) 2,810,491 2,810,491 450,846
On-Site Drainage Area (sf) 2,810,491 2,810,491 450,846
Off-Site Drainage Area (sf) 0 0 0
Proposed Impervious Area ** (sf) 322,344 1,273,259 153,767
% Impervious Area ** (Total) 11.0% 45.0% 34.0%
Impervious ** Surface Area Drainage Area Drainage Area _ Drainage Area
On-Site Building/Lots (sf)
On-Site Streets (sf)
On-Site Parking (sf)
On-Site Sidewalks (sf)
Other On-Site (sf)
Future (sf)
Off-Site (sf)
Existing BUA *** (sf)
Total (sf):
IPRB508 P 0649
Mail To:
WARRANTY DEED-Form WD-601 printed and for sale by James Williams & Co., Inc., Yadkinv0le, N. C,
STATE OF NORTH CAROLINA. Surry _County.
THIS DEED, Made this 30th day of August ,19 41 .by and between Joe C. Haymore and wife,
Cleo B. Haymore of Surry county
an of North Carolina, hereinafter called Grantor, and Mount Airy-Surry County Airport Authority
_ of Surry County and State of North Carolina, hereinafter
called G , whose permanent malling address is
W ITN S E Hr That the Grantor, for and In consideration of the sum of TEN DOLLARS ($10.00) AND O.V .C.---------='D.llars
and other 9 o and valuable considerations to him in hand pald by the Grantee, the receipt whemof, la hereby. acknowledged, ha, given, granted, bargained, sold
and :.n-ye and by these presents does give, grant, bargain, sell, convey and confirm unto the Grantee, his heirs and/or successors and assigns, premises In
Mount Airy Township, Surry County, North Carolina, described as follows:
DESCRIPTION OF PROPERTY, SEE EXHIBIT "A" ATTACHED HERETO
INCORPORATED HEREIN BY REFERENCE.
=F NORTH CAROT.IidA '
V? (?
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LX; 3
SEP1797
t.S {I T) 0.110

f?Oat EFtate [•::;^r•Tnx
FILED
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'91 SEP 17 P2:33
DENNIS W °flif"' CAMERON O?
REuIatFR Of DEEDS
SURRY COUNT Y.N.C.
The above land was conveyed to Grantor by . See Book No, , Page
TO HAVE AND TO HOLD The above described premises, with all the sppur rra ces theteunto belonging, at M any wise appertaining, unto the Grantee, his
heirs and/or successors and assigns forever.
And the Grantor covenants that he is seized of said premises in fee and has tt? rght to convey the name in Ice simple; that Said premises are free from en.
wmbrances (with the exceptions above staled, If my)t and that he wilt warn n t defend the said title to the same against the lawful claims of all pttsons
whomsoever.
When refcrenee is made to the Grantor or Grantee, the singular shall include the plural and the masculine shall include the feminine or the neuter.
J Iti?ITNESS WHE?tRE?//ppF, The Grantor has hereunto set his hand and seal, the day and year first above written.
(SEAL) sRdu? (SEAL)
JoLpy C. aymore 13. aymor
(SEAL) ? (SEAL)
STAT,(p?[p.,? E NORTH C. ROLIN ' Su'Y' COUNTY. `?vttR%5 lIR t}I^I
? A
I, '" "??? ?7' f,, •"!" f? . a Notary Pub11 9f'svid County, do hereby ee?Y9(1Fa
Joe C Ha,ymore and wife C'Ireo 1_11 Q (J i _ f
Grantor, personally appeared before me this day and acknowledged the execution of the foreg Ing de
Witness my hand and notarial Sell, this the•' day of ? C /a ?a% 9-94.
My Commission Expires: ??Yb• ld ? AdAki- IWLJ 0. .ISjLI
STATE OF NORTH CAROLINA COUNTY. . f1. ?i??JUN,PY N• -,-
lJ
a Notary Public of said Counh/,'tlb hereby certify t?iedr!lw...Otss
Grantor, personally appeared before me this day and acknowledged the execution of the foregoing deed. l• ?O
Witness my hand and notarial still this the day of
My Commission Expires: N. P. [SEAL)
STATE OF NORTH CAROLINAS?urry -y,- Co
- U Ty.,/)
The foregoing certificate(s) of LGI?'c? ' A Iy?P /1A B 1? °I tYJ.LUL4.'-?t (R. ..C?.t
is (are) certified to be correct. This Instrument was presented for registration this day of_-
-A.M., 9 )j ,
t P.M., and slaty recorded in the o)fice of the Register of peed: of Surry n county,
North Carolina, in Book Page_
That th:t-day Of_ . " 4 A. D.. 1991 By?/?•
Register of Deeds Assistant,, DeeatL-Register of Dce
This Deed drawn by Carl EBella Johnson Bell & Rives Mount Airy North Carolina 27030
4!3.0a
3ta.oU Sle7ear aee.
?0
06
Book 508 Pag 9
LX?i11H1T "A"
Lying in t)?e Mount Airy Township of Surry County, North Carolin•-I
;band being the remaining portion of the grantors 1,a dngp?sQ .,f
the existing Airport lands, said grantees lands de n`? ed o ?rry
County tax map No. 5948 as parcel 6097; situated•horthwest of U.S.
Highway 52 Bypass about 7/10 of a mile southeast of its interchanPo
with Holly Springs Church Road (NCSR 1815); bounded on the south aril
wets by other lands of the grantee (RB 466 Pg 1173, RB 484 Pg 1471, Rlt
476(-Pg 432 and others), on the north by D.S. Cook and Wife Lucy P.
Coo"B 243 Pg 56), and on the east by the Heirs of Eunice Reeves (1?R
112 tg-y06) and by the Heirs of Margie Joyce (DB 233 Pg 222); and sa it
tractng more particularly described as follows:
B NNING on a newly set one inch iron pipe in the center of
Stoney Creek and in ti?e eastern boundary of existing Airport lands,
said pipe being N 540 43' 24" E 491.54 feet from N.C. Geodetic
Survey Station "MOUNTPORT11 having N.C. State Plane Coordinate values
*f Nort.higQ?- 908,596.88 feet and Easting = 1,543,233.72 feet (f•er
North Amnri?. Datum of 1927); thence from said BEGINNING iron pipe in
the creek running in a clockwise direction with Cook six courses
dov)n the m derings of said Stoney Creek S 49° 101 4511 E 24.61
feet:; thence ® 59° 00' 4711 E 95.90 feet; thence S 559 03' 4611 E
52.74 feet; ti>e S 26° 131 0011 E 95.33 feet; thence S 28° 59'
5411 E 83.96 fee thence S 320 171 1011 E 73.01 feet to the conf.111
enae of a branch from the northeast with the waters of said Stony
Creel;; thence continuing with Cook and running two courses up th-
branch N 33° 091 0111 E 113.44 feet; thence N 44° 531 4211 E 29.07
feet to a point in k?id branch; thence leaving the branch and aontinn-
Ing with Cook N 80° r 34t1 E 198.00 feet to a newly set one inch
iron pipe at a co corner with Cook in the Reeves Heirs' west
boundary line (said n pipe being S 01° 571 2411 W 1350.74 feat.
from a found five-amts inch iron reinforcing bar at the Reeves
))Firs' northwest corn , thence running with Reeves Heirs' Will
crossing Stoney Creels S 01. 571 2411 W 995.43 feet to the confluenvF
of another branch with the waters of Stoney Creek. a common corner f-r
Reeves Heirs and Joyce Heirs in the eastern boundary line of the lands
herein described; thence co tinuing the same line with Joyce Heirs
S 01' 57
1 2411 W
4
t
-
24
.57 t
o a newly set one inch iron pipe,
common corner with said Re v s Heirs; thence running first with
Reeves Heirs and then with o r_ Airport lands S 66' 481 411, W
(crossing a newly set one inch on pipe on line at 155.89 feet) a
total distance of 355.61 feet to point at the southwest corner n[
the lands herein described common with two tracts of aforementioned
other Airport lands( thence with said other lands N 05° 50' 30" W
1433.10 feet to the point of the BEGINNING; containing 12,640 acres
per theodolite survey oriented to th''gg??N
C. State Plane Coordinate
System (N.C. Grid - NAD 27) in 1991 )i??' ci?ard D. Bodges, RLS No. I.••
i
3048. This property is sub3ect to any(ariffi all right(s)-of-way and/or
easement(s) which may or may not be of cord as of the date of this
instrument.
?
For title reference see the Deoemb
, 1984 deed from Glenn R.
.n
Haymore and wife Reva S. Haymore to Joe C
aymore recorded in RB 411
Pg 192 in the Surry County Registry. For additional information see
the February, 1990 survey and unrecorded plat by Richard D. [lodges
,
RLS entitled: REVISION E TO THE BOUNDARY AND LOCATION SURVEY FOR
MOUNT AIRY - SURRY COUNTY AIRPORT AUTHORITY jPEXHIBIT "A" PROPER'ry
"
MAP
.

The Grantor reserves the right to remove the timber and wo rom the above described
property within six months from the date of the within deed.
?a
0
V^
?p .
V'
Book 608 PagkoO
Highway North Carolina Department of Transportation
5I:0 (j17Wc`lCel' Highway Stormwater Program
IYIIN:Itlll
DRY DETENTION BASIN CHECKLIST Page 1 of 1
GENERAL PROJECT INFORMATION
Project: MT N=RY NMZPQ&7- a.t.Y S(?2zn/?.S(?ApIQCW?1??ar,?IP No:
Prepared by: yak, Date: 6/23/11 Checked by: Date:
NCDOT Division: River Basin: y,Q Z - 19G--OW L''Z:
City: _ /I,t7, Ajgy NCDWQ Stream Classification
County: ScJUY Primary: YevJ7
CAMA County: Yes No Supplemental:
TVA County: Yes No 303(d) Stream: Yes No
Buffer Required: Yes No
PROJECT DESCRIPTION
Check the correct response. Yes No Not Comments/Design
Applicable Assumptions
1 Was a field visit made to the proposed dry d [E] 0"' El
etention basin site?
2 Is the dry detention basin positioned
t
id ? ?
ou
s
e the roadway clear recovery zone?
3 Was maintenance access provided? El El
4 Were off-site drainage areas verified and
d ?
accommo
ated?
5 Was a pretreatment BMP used in series
i
h
h El Er ?
w
t
t
e d detention basin?
6 Was soil compaction information provided
i
th 1
i El El
n
e project specifications? .
7 Was energy dissipation required for the
11

L?J
emergency spillway (if used)? -
8 Was the buoyancy of the outlet structure
l
l
ca
cu
ated?
9 Was the vegetative cover specified? El F1
10 Was the grade of the basin bottom shown
t
l ?
o s
ope and drain toward the orifice?
Was topography downgrade of the dry
11 detention basin outlet reviewed for ability
El
El
t
o handle flow?
12 Were velocities evaluated for scour and
i ?/
C! ? ?
eros
on potential?
13 Were all design assumptions
d ? ?
ocumented?
I=1lq way j North Carolina Department of Transportation
?lOK?l1W[?l'1 Highway Stormwater Program 1
nun am
DRY DETENTION BASIN CHECKLIST Page 1^ of 1
GENERAL PROJECT INFORMATION
Project: WT.A19V NWZPQ&7-HaL Y GP9-7'V4S(24AQQ(°LdSA7 yiIP No:
Prepared by: _ ?k- Date: V 23/11 Checked by: Date:
NCDOT Division: It River Basin: Y412 Cznn) , PC-- C-O
City: M7. A: my NCDWQ Stream Classification
County: S(iU %/ Primary: `T'IgvJ?
CAMA County: Yes No Supplemental:
TVA County: Yes No 303(d) Stream: Yes No
Buffer Required: Yes No
PROJECT DESCRIPTION F6KP- 4
Check the correct response. Yes No Not Comments/Design
Applicable Assumptions
1 Was a field visit made to the proposed dry
d
t
i
e
ent
on basin site?
2 Is the dry detention basin positioned
21
E
El
outside the roadwav clear recnverV Anna?
Highway = i North Carolina Department of Transportation I
10 l'LllWc'1[ei'•? Highway Stormwater Program I
DRY DETENTION BASIN CHECKLIST Page 1 of 1
GENERAL PROJECT INFORMATION
!? n
Project: M-r NrigV NMZPQ/a,7-NOLLY Ge/Z "4S9oAy1QLc,dcA'NJ]P No:
Prepared by: _ 71(& k.. Date: C123111 Checked by: Date:
NCDOT Division: It River Basin: -Y-41247a) - PL--C-0 C-_
City: A47. 41AY NCDWQ Stream Classification
County: Sc1/ R %/ Primary: `rjeod r
CAMA County: Yes No Supplemental:
TVA County: Yes No 303(d) Stream: Yes No
Buffer Required: Yes No
PROJECT DESCRIPTION r.6KP_ S
Check the correct response. Yes
No
?1
Not
11
Comments/Design
Applicable Assumptions
1 Was a field visit made to the proposed dry ? ?
detention basin site?
2 Is the dry detention basin positioned Er ? ?
outside the roadway clear recovery zone?
3 Was maintenance access provided? ? [?
4 Were off-site drainage areas verified and ? ?
accommodated?
5 Was a pretreatment BMP used in series ? Ef ?
with the d detention basin?
6 Was soil compaction information provided
j ® ?
in the pro
ect specifications?
7 Was energy dissipation required for the ? ??
u ?
emergency spillway (if used)?
8 Was the buoyancy of the outlet structure
?
El
calculated?
9 Was the vegetative cover specified? El El
10 Was the grade of the basin bottom shown ?
to slope and drain toward the orifice?
Was topography downgrade of the dry
11 detention basin outlet reviewed for ability El
to handle flow?
12 Were velocities evaluated for scour and
i ® ?
eros
on potential?
13 Were all design assumptions
d ? ?
ocumented?
Highway i North Carolina Department of Transportation
J SI`OI"th7Wa[el'] Highway Stormwater Program
` lYl[IIULIL
DRY DETENTION BASIN CHECKLIST Page 1 of 1
GENERAL PROJECT INFORMATION
Project: M-r; A-rP-y N74zPQ?27'-/t'tASP SPiz-sVcsRoAoP uC,,l? IP No:
Prepared by: %5k- Date: Checked by: Date:
NCDOT Division: It River Basin: Y,4 47 - PGX 0 (--"Z-7
City: A47, A-z¢-Y NCDWQ Stream Classification
County: 3c1U y Primary: " T'Rdar
CAMA County: Yes No Supplemental:
TVA County: Yes No 303(d) Stream: Yes No
Buffer Required: Yes No
PROJECT DESCRIPTION
Check the correct response.
11 Yes
No
Not
Comments/Design
Applicable Assumptions
1 Was a field visit made to the proposed dry El
detention basin site?
2 Is the dry detention basin positioned ®® 0 El
outside the roadway clear recovery zone?
3 Was maintenance access provided? El []

4 Were off-site drainage areas verified and
0
accommodated?
5 Was a pretreatment BMP used in series El 0/ 1 0
with the d detention basin?
6 Was soil compaction information provided
j
I?/
El
1 0
in the pro
ect specifications? 1
7 Was energy dissipation required for the ®
u El
emergency spillway (if used)? .
8 Was the buoyancy of the outlet structure
calculated?
9 Was the vegetative cover specified? 2" El El
10 Was the grade of the basin bottom shown
to slope and drain toward the orifice?
Was topography downgrade of the dry
11 detention basin outlet reviewed for ability o El
to handle flow?
12 Were velocities evaluated for scour and ® ?
erosion potential?
13 Were all design assumptions El El
documented?
Highway .i North Carolina Department of Transportation £ '
SIOCLIIWc'lWfi Highway Stormwater Program
--Ptwawt -
DRY DETENTION BASIN CHECKLIST Page 1 of 1
GENERAL PROJECT INFORMATION
Project: WT. INTR. N74z g&7 - ALLY No:
Prepared by: -7,12; k- Date: 6/2,9/11 Checked by: Date:
NCDOT Division: It River Basin: Y,Q K.'z PGM O C:2
City: M7. A-.y NCDWQ Stream Classification
County: &JU y Primary: -rieC)c/
CAMA County: Yes No Supplemental:
TVA County: Yes No 303(d) Stream: Yes No
Buffer Required: Yes No
PROJECT DESCRIPTION f2oKp_,
Check the correct response. Yes No Not Comments/Design
Applicable Assumptions
1 Was a field visit made to the proposed dry ? ?
detention basin site?
2 Is the dry detention basin positioned or
?
?
outside the roadway clear recovery zone?
3 Was maintenance access provided? ® ?
4 Were off-site drainage areas verified and ? ?
accommodated?
5 Was a pretreatment BMP used in series ® ET' ?
with the d detention basin?
6 Was soil compaction information provided
j 1?10" ® ?
in the pro
ect specifications?
7 Was energy dissipation required for the
® 1
0'
El
emergency spillway (if used)?
8 Was the buoyancy of the outlet structure ?
El
calculated? I
9 Was the vegetative cover specified? ? ?
10 Was the grade of the basin bottom shown ? El'
to slope and drain toward the orifice?
Was topography downgrade of the dry
/
11 detention basin outlet reviewed for ability ET
? El El
to handle flow? 1 I
12 Were velocities evaluated for scour and
0'
El
El
erosion potential?
13 Were all design assumptions
El
documented?
\f:IN 1, Y ? _ ,a
1-Ilghway I North Carolina Department of Transportation
d(--Store waWfl Highway Stormwater Program 4K
llt ?-_-?urra„1
DRY DETENTION BASIN CHECKLIST Page 1 of 1
GENERAL PROJECT INFORMATION
Project: M-rA-r1gV1*MPga7-UQLL1I IPNo:
Prepared by: % sl- Date: C-23111 Checked by: Date:
NCDOT Division: It River Basin: Y-4 47 ?(-C-O LEE
City: M7. Amy NCDWQ Stream Classification
County: 3,JU y Primary:
CAMA County: Yes No Supplemental:
TVA County: Yes No 303(d) Stream: Yes No
Buffer Required: Yes No
PROJECT DESCRIPTION
Check the correct response. Yes No Not Comments/Design
Applicable Assumptions
1 Was a field visit made to the proposed dry ? [4'0 0
detention basin site?
2 Is the dry detention basin positioned r-?
LJ
outside the roadway clear recovery zone?
3 Was maintenance access provided? [] []
4 Were off-site drainage areas verified and 0
accommodated?
5 Was a pretreatment BMP used in series ? H
with the d detention basin?
6 Was soil compaction information provided
j 12 0 Ell
in the pro
ect specifications?
7 Was energy dissipation required for the ® H/ El
emergency spillway (if used)? .
8 Was the buoyancy of the outlet structure El
calculated?
9 Was the vegetative cover specified? []
10 Was the grade of the basin bottom shown El Ff El
to slope and drain toward the orifice?
Was topography downgrade of the dry
11 detention basin outlet reviewed for ability El El
to handle flow?
12 Were velocities evaluated for scour and
erosion potential?
13 Were all design assumptions
documented?
I-IIghWOy I North Carolina Department of Transportation
__ StON"1111A!c`11ef Highway Stormwater Program
lYl ll:l 1.\ll "°54.
DRY DETENTION BASIN CHECKLIST Page 1 of 1
GENERAL PROJECT INFORMATION
Project: MT ATAY N'xlZP<M7 a RALLY SP/ZZVi $RoAvP-CUctIP No:
Prepared by: 'wk, Date: C/23/11 Checked by: Date:
NCDOT Division: It River Basin: YA KT C; 02 ---
City: A47. Ai Ay NCDWQ Stream Classification
County: Sju y Primary:
CAMA County: Yes No Supplemental:
TVA County: Yes No 303(d) Stream: Yes No
Buffer Required: Yes No
PROJECT DESCRIPTION r"61_1\Pd., 9 A
Check the correct response. Yes
No
11
Not
11
Comments/Design
Applicable Assumptions
1 Was a field visit made to the proposed dry
detention basin site?
2 Is the dry detention basin positioned
outside the roadway clear recovery zone?
3 Was maintenance access provided? [] El
4 Were off-site drainage areas verified and C]
accommodated?
5 Was a pretreatment BMP used in series
El
with the d detention basin? _ ,
6 Was soil compaction information provided
j
13'
1 El
El
in the pro
ect specifications? ,
7 Was energy dissipation required for the
emergent spillway (if used)?
8 Was the buoyancy of the outlet structure ?
calculated?
9 Was the vegetative cover specified? El 0
10 Was the grade of the basin bottom shown El Er El
to slope and drain toward the orifice?
Was topography downgrade of the dry
/
11 detention basin outlet reviewed for ability ET El El
to handle flow?
12 Were velocities evaluated for scour and ?
El
potential?
13 Were all design assumptions El F1
documented?
4-lighway = = i North Carolina Department of Transportation
---S fOXl71W[?l'l
Highway Stormwater Program
lYl(%i1L \l "

`S ` F7•
DRY DETENTION BASIN CHECKLIST Page 1 of 1
GENERAL PROJECT INFORMATION
Project: MT A-tray A-WZP<W 7 -NOLLY SeXZ44590ApGU 4?ft TIP No:
Prepared by: Date: 6/23/11 Checked by: Date:
NCDOT Division: It River Basin: y,Q 12 Kz - nL-C; O C?2
City: IU7, A-L2y NCDWQ Stream Classification
County: Stitt y Primary: 7'
CAMA County: Yes No Supplemental:
TVA County: Yes No 303(d) Stream: Yes No
Buffer Required: Yes No
PROJECT DESCRIPTION
(
Check the correct response. Yes No Not Comments/Design
Applicable Assumptions
1 Was a field visit made to the proposed dry El
detention basin site?
2 Is the dry detention basin positioned
outside the roadway clear recovery zone?
3 Was maintenance access provided? El []
4 Were off-site drainage areas verified and 0
accommodated?
5 Was a pretreatment BMP used in series ® El/ 0
with the d detention basin?
6 Was soil compaction information provided
j 12' El El
in the pro
ect specifications?
7 Was energy dissipation required for the
emergent spillway (if used)? .
$ Was the buoyancy of the outlet structure El
calculated?
9 Was the vegetative cover specified? []
10 Was the grade of the basin bottom shown El El
to slope and drain toward the orifice?
Was topography downgrade of the dry
11 detention basin outlet reviewed for ability
to handle flow?
H
12 Were velocities evaluated for scour and
0
El
erosion potential?
1
13 Were all design assumptions ?
documented?
?{ax i

I-lighway North Carolina Department of Transportation
?iOX4l1Wc`]lC'1'1 Highway Stormwater Program
z.,

<S A
DRY DETENTION BASIN CHECKLIST Page 1 of 1
GENERAL PROJECT INFORMATION
Project: ,v\T, IXT%.Y )hVMPQa7 - U4LLY 6e1Z ,V(.SRc A.9IQ_ 6"UCA7 IP No:
Prepared by: sk, Date: 6/23/11 Checked by: Date:
NCDOT Division: It River Basin: Y-4 r,7 r Pqt o er,
City: M7, AZ" NCDWQ Stream Classification
County: SJAR y Primary: `nec)d r
CAMA County: Yes No Supplemental:
TVA County: Yes No 303(d) Stream: Yes No
Buffer Required: Yes No
PROJECT DESCRIPTION f61y _ /0
Check the correct response. Yes No Not Comments/Design
Applicable Assumptions
1 Was a field visit made to the proposed dry ? Er El
detention basin site?
2 Is the dry detention basin positioned Ll r]
outside the roadway clear recovery zone?
3 Was maintenance access provided? El El
4 Were off-site drainage-areas verified and
accommodated?
5 Was a pretreatment BMP used in series ? Er
with the d detention basin?
6 Was soil compaction information provided
j
in the pro
ect specifications?
7 Was energy dissipation required for the ® Ll El
-emergency spillway (if used)?
8 Was the buoyancy of the outlet structure El El
calculated?
9 Was the vegetative cover specified? []
10 Was the grade of the basin bottom shown
to slope and drain toward the orifice?
Was topography downgrade of the dry
11 detention basin outlet reviewed for ability E!( El
to handle flow?
12 Were velocities evaluated for scour and
0
El
erosion potential?
13 Were all design assumptions
0
El
documented?
Permit
NCDENR
STORMWATER MANAGEMENT PERMIT APPLICATION FORM
401 CERTIFICATION APPLICATION FORM
WET DETENTION BASIN SUPPLEMENT
This form must be filled out, printed and submitted.
The Required Items Checklist (Part Ill) must be printed, filled out and submitted along with all of the required information.
(to be provided by DWQ)
o??F W ATF9QG
> -i
o
I. PROJECT INFORMATION
Project name Mt. Airy - Surry County Airport Stormwater Management Plan
Contact person Tim Kennerly, PE
Phone number 336.662.4251
Date 28-May-11
Drainage area number Runway Taxiway Extension
II. DESIGN INFORMATION
Site Characteristics
Drainage area 2,810,491 fe
Impervious area, post-development 322,344 fe
%impervious 11.47%
Design rainfall depth 1.0 in
Storage Volume: Non-SA Waters
Minimum volume required
Volume provided
Storage Volume: SA Waters
1.5' runoff volume
Pre-development 1-yr, 24-hr runoff
Post-development 1-yr, 24-hr runoff
Minimum volume required
Volume provided
Peak Flow Calculations
Is the pre/post control of the lyr 24hr storm peak flow required?
1-yr, 24-hr rainfall depth
Rational C, pre-development
Rational C, post-development
Rainfall intensity: 1-yr, 24-hr storm
Pre-development 1-yr, 24-hr peak flow
Post-development 1-yr, 24-hr peak flow
Pre/Post 1-yr, 24-hr peak flow control
Elevations
Temporary pool elevation
Permanent pool elevation
SHWT elevation (approx. at the perm. pool elevation)
Top of 10ft vegetated shelf elevation
Bottom of 10ft vegetated shelf elevation
Sediment cleanout, top elevation (bottom of pond)
Sediment cleanout, bottom elevation
Sediment storage provided
Is there additional volume stored above the state-required temp. pool?
Elevation of the top of the additional volume
35,834 to Insufficient required volume.
71,690 {{3
OK, volume provided is equal to or in excess of volume required.
to
fe
to
to
fe
y (Y or N)
2.9 in
0.65 (unitless)
0.64 (unifless)
0.12 in/hr Insufficient. Check intensity calculation.
17.82 fe/sec
28.61 felsec
10.79 f0lsec
1208.00 fmsi
1205.00 fmsl
1195.00 fmsi
1205.50 fmsl
1204.50 fmsi Data not needed for calculation option 41, but OK if provided.
1201.00 fmsi
1200.00 fmsl Data not needed for calculation option #1, but OK if provided.
1.00 ft
(Y or N)
1208.0 fmsi OK
Form SW401-Wet Detention Basin-Rev.8-9117109 Parts I. & II. Design Summary, Page 1 of2
Permit
(to be provided by DWQ)
11. DESIGN INFORMATION
Surface Areas
Area, temporary pool 26,916 f?
Area REQUIRED, permanent pool 25,294 fe
SAIDA ratio 0.90 (unitless)
Area PROVIDED, permanent pool, A,.,,., 19,666 ftz Insufficient permanent pool surface area
Area, bottom of 1 Oft vegetated shelf, Abot_sneif 17,042 ft2
Area, sediment cleanout, top elevation (bottom of pond), Abot_pond 12,042 ff
Volumes
Volume, temporary pool 71,690 fO OK
Volume, permanent pool, VPennpool 71,810 fts
Volume, forebay (sum of forebays if more than one forebay) fe
Forebay % of permanent pool volume %
SAIDA Table Data
Design TSS removal 90 %
Coastal SAIDA Table Used? n (Y or N)
Mountain/Piedmont SAIDA Table Used? y (Y or N)
SAIDA ratio 0.90 (unitless)
Average depth (used in SA/DA table):
Calculation option 1 used? (See Figure 10-2b) y (Y or N)
Volume, permanent pool, V?rmpo 71,810 fO
Area provided, permanent pool, Apermpool 19,666 ff
Average depth calculated 4.50 ft OK
Average depth used in SAIDA, d,,, (Round to nearest 0.5ft) 4.5 ft OK
Calculation option 2 used? (See Figure 10-2b) n (Y or N)
Area provided, permanent pool, Apermp001 19,666 fe
Area, bottom of 10ft vegetated shelf, Abot_sheit 17,042 fe
Area, sediment cleanout, top elevation (bottom of pond), Abotpond 12,042 f?
"Depth" (distance b/w bottom of 1Oft shelf and top of sediment) 3.50 ft
Average depth calculated 4.50 ft OK
Average depth used in SAIDA, da,, (Round to nearest 0.5ft) 4.5 ft OK
Drawdown Calculations
Drawdown through orifice? y (Y or N)
Diameter of orifice (if circular) 3.00 in
Area of orifice (if-non-circular) in'
Coefficient of discharge (CD) 0.60 (unitless)
Driving head (Ho) 0.81 ft
Drawdown through weir? n (Y or N)
Weir type (unitless)
Coefficient of discharge (C,,) (unitless)
Length of weir (L) ft
Driving head (H) ft
Pre-development 1-yr, 24-hr peak flow 17.82 ft3/sec
Post-development 1-yr, 24-hr peak flow 28.61 fP/sec
Storage volume discharge rate (through discharge orifice or weir) 0.21 ft3/sec
Storage volume drawdown time 2.00 days OK, draws down in 2-5 days.
Additional Information
Vegetated side slopes
Vegetated shelf slope
Vegetated shelf width
Length of flowpath to width ratio
Length to width ratio
Trash rack for overflow & orifice?
Freeboard provided
Vegetated filter provided?
Recorded drainage easement provided?
Capures all runoff at ultimate build-out?
Drain mechanism for maintenance or emergencies is:
Form SW401-Wet Detention Basin-Rev.8-9117/09
3 :1
10 :1
10.0 ft
3 :1
3.0 :1
y (Y or N)
1.0 ft
n (Y or N)
(Y or N)
y (Y or N)
OK
OK
OK
OK
OK
OK
OK
OK
OK
Parts I. & II. Design Summary, Page 2 of 2
Permit Number:
(to be provided by DWQ)
Drainage Area Number:
Wet Detention Basin 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.
The wet detention basin system is defined as the wet detention basin,
pretreatment including forebays and the vegetated filter if one is provided.
This system (check one):
? does ® does not incorporate a vegetated filter at the outlet.
This system (check one):
? does ? does not incorporate pretreatment other than a forebay.
Important maintenance procedures:
- Immediately after the wet detention basin is established, the plants on the
vegetated shelf and perimeter of the basin should be watered twice weekly if
needed, until the plants become established (commonly six weeks).
- No portion of the wet detention pond should be fertilized after the first initial
fertilization that is required to establish the plants on the vegetated shelf.
- Stable groundcover should be maintained in the drainage area to reduce the
sediment load to the wet detention basin.
- If the basin must be drained for an emergency or to perform maintenance, the
flushing of sediment through the emergency drain should be minimized to the
maximum extent practical.
- Once a year, a dam safety expert should inspect the embankment.
After the wet detention pond is established, it should be inspected once a month and
within 24 hours after every storm event greater than 1.0 inches (or 1.5 inches if in a
Coastal County). Records of operation and maintenance should be kept in a known set
location and must be available upon request.
Inspection activities shall be performed as follows. Any problems that are found shall
be repaired immediately.
BMP element: Potential problem: How I will rernediate the problem:
The entire BMP Trash/debris is resent. Remove the trash/debris.
The perimeter of the wet Areas of bare soil and/or Regrade the soil if necessary to
detention basin 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.
Vegetation is too short or too Maintain vegetation at a height of
long. approximately six inches.
Form SW401-Wet Detention Basin O&M-Rev.4 Page 1 of 5
Permit Number:
(to be provided by DWQ)
Drainage Area Number:
Form SW401-Wet Detention Basin O&M-Rev.4 Page 2 of 5
Permit Number:
(to be provided by DWQ)
Drainage Area Number:
BMP element: Potential problem: How I will remediate the problem:
The inlet device: pipe or The pipe is clogged. Unclog the pipe. Dispose of the
swale sediment off-site.
The pipe is cracked or Replace the pipe.
otherwise damaged.
Erosion is occurring in the Regrade the swale if necessary to
swale. smooth it over and provide erosion
control devices such as reinforced
turf matting or riprap to avoid
future problems with erosion.
The forebay Sediment has accumulated to Search for the source of the
a depth greater than the sediment and remedy the problem if
original design depth for possible. Remove the sediment and
sediment storage. dispose of it in a location where it
will not cause impacts to streams or
the BMP.
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. If pesticide is used, wipe it on
the plants rather than spraying,
The vegetated shelf Best professional practices Prune according to best professional
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
it is necessary.
Weeds are present. Remove the weeds, preferably by
hand. If pesticide is used, wipe it on
the plants rather than spraying.
The main treatment area Sediment has accumulated to Search for the source of the
a depth greater than the sediment and remedy the problem if
original design sediment possible. Remove the sediment and
storage depth. dispose of it in a location where it
will not cause impacts to streams or
the BMP.
Algal growth covers over Consult a professional to remove
50% of the area. and control the algal growth.
Cattails, phragmites or other Remove the plants by wiping them
invasive plants cover 50% of with pesticide (do not spray).
the basin surface.
Form SW401-Wet Detention Basin O&M-Rev.4 Page 3 of 5
Permit Number:
(to be provided by DWQ)
Drainage Area Number:
BMP element: Potential problem: How I will remediate the problem:
The embankment Shrubs have started to grow Remove shrubs immediately.
on the embankment.
Evidence of muskrat or Use traps to remove muskrats and
beaver activity is present. consult a professional to remove
beavers.
A tree has started to grow on Consult a dam safety specialist to
the embankment. remove the tree.
An annual inspection by an Make all needed repairs.
appropriate professional
shows that the embankment
needs repair. if applicable)
The outlet device Clogging has occurred. Clean out the outlet device. Dispose
of the sediment off-site.
The outlet device is damaged Repair or replace the outlet device.
The receiving water Erosion or other signs of Contact the local NC Division of
damage have occurred at the Water Quality Regional Office, or
outlet. the 401 Oversight Unit at 919-733-
1786.
The measuring device used to determine the sediment elevation shall be such
that it will give an accurate depth reading and not readily penetrate into
accumulated sediments.
When the permanent pool depth reads 3_5 feet in the main pond, the sediment
shall be removed.
When the permanent pool depth reads 2.5 feet in the forebay, the sediment
shall be removed.
BASIN DIAGRAM
ill in the blanks)
Sediment Removal
Bottom
Permanent Pool Elevation 1205
1202 ]
-----------------
FOREBAY
t -ft Min.
Sediment
Storage
Pool
?Sediment Removal Elevation 1201
----- - Volume
------ ---------------------------
Bottom Elevation
1-ft
MAIN POND
Storage
Form SW401-Wet Detention Basin O&M-Rev.4 Page 4 of 5
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:Mt. Airy-Surry County Airport - Stormwater Management Plan
BMP drainage area number:Runway-Taxiway Extension BMP
Print
Address:
Phone:
Signature:
Date:
Note: The legally responsible parry 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, , a Notary Public for the State of
County of , do hereby certify that
personally appeared before me this
day of , and acknowledge the due execution of the
forgoing wet detention basin maintenance requirements. Witness my hand and official
seal,
SEAL
My commission expires
Form SW401-Wet Detention Basin O&M-Rev.4 Page 5 of 5
Permit No.
(to be provided by DWQ)
o?OF W ATF9OG
A? STORMWATER MANAGEMENT PERMIT APPLICATION FORM o Y
HCDENR
401 CERTIFICATION APPLICATION FORM
DRY EXTENDED DETENTION BASIN SUPPLEMENT
This form must be filled out, printed and submitted.
The Required Items Checklist (Part Ill) must be printed, filled out and submitted along with all the required information.
I. PROJECT INFORMATION
Project name Mt. Airy - Surry County Airport Stormwater Management Plan
Contact person Tim Kennerly, PE
Phone number 336.662.4251
Date 28-May-11
Drainage area number Taxiway'A' South Extension
II. DESIGN INFORMATION
Site Characteristics
Drainage area 450,846.00 ftz
Impervious area 32,234.00 ft2
% Impervious 0.07
Design rainfall depth 1.00 in
Peak Flow Calculations
1-yr, 24-hr rainfall depth 2.90 in
Rational C, pre-development 0.63 (unitless)
Rational C, post-development 0.66 (unitless)
Rainfall intensity: 1-yr, 24-hr storm 0.12 in/hr
Pre-development 1-yr, 24-hr peak flow 0.08 ft3/sec
Post-development 1-yr, 24-hr peak flow 0.07 ft3/sec
Pre/Post 1-yr, 24-hr peak control -0.01 ft3lsec
Storage Volume: Non-SA Waters
Minimum required volume 4,283.00 ft3
Provided volume 4,300.00 ft3 OK
Sediment storage volume provided 1,075.00 ft3 OK
Storage Volume: SA Waters
1.5" runoff volume ft3
Pre-development 1-yr, 24-hr runoff volume ft3
Post-development 1-yr, 24-hr runoff volume ft3
Minimum required volume ft3
Provided volume ft3
Sediment storage volume provided ft3
Basin Design Parameters
Drawdown time days
SHWT elevation fmsl
Basin bottom elevation fmsl
Storage elevation fmsl
Basin side slopes :1
Top elevation fmsl
Freeboard provided ft
Basin Bottom Dimensions
Basin length 63.00 ft
Basin width 29.00 ft
Length to width ratio 2.00 :1 OK
Form SW401-Dry Extended Detention Basin-Rev.3 Parts I. & H. Design Summary, Page 1 of 2
Permit No.
(to be provided by DWQ)
Additional Information
Total runoff volume captured by basin
Forebay provided
Is basin in a recorded drainage easement?
Does basin capture all runoff at ultimate build-out?
Is a sediment depth indicator included?
Does the basin include a drain?
0.10 ac-in Forebay is not required
y (Y or N)
(Y or N)
y (Y or N) OK
y (Y or N) OK
y (Y or N) OK
Form SW401-Dry Extended Detention Basin-Rev.3 Parts I. & II. Design Summary, Page 2 of 2
Permit Number:
(to be provided by DWQ)
Drainage Area Number:
Dry Extended Detention Basin
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.
The dry extended detention basin system is defined as the dry detention basin, outlet
structure, pretreatment including forebays and the vegetated filter if one is provided.
This system (check one):
? does ® does not
This system (check one):
? does ® does not
incorporate a vegetated filter at the outlet.
incorporate pretreatment other than a forebay.
Important maintenance procedures:
- The drainage area will be managed to reduce the sediment load to the dry
extended detention basin.
- Immediately after the dry extended detention basin is established, the vegetation
will be watered twice weekly if needed until the plants become established
(commonly six weeks).
- No portion of the dry extended detention pond will be fertilized after the first
initial fertilization that is required to establish the vegetation.
- I will maintain the vegetation in and around the basin at a height of
approximately six inches.
- Once a year, a dam safety expert will inspect the embankment.
After the dry extended detention basin is established, it will be inspected once a quarter
and within 24 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 will be available upon request.
Inspection activities shall be performed as follows. Any problems that are found shall
be repaired immediately.
BMP element: Potential problem: How I will remediate the problem:
The entire BMP Trash/debris is resent. Remove the trash/ debris.
The perimeter of the dry Areas of bare soil and/or Regrade the soil if necessary to
extended detention erosive gullies have formed. remove the gully, and then plant a
basin ground cover and water until it is
established. Provide lime and a
one-time fertilizer application.
Form SW401-Dry Detention O&M-Rev.3 Page 1 of 4
BMP element: Potential problem: How I will remediate the problem:
The inlet device: pipe or The pipe is clogged (if Unclog the pipe. Dispose of the
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.
The forebay Sediment has accumulated Search for the source of the
and reduced the depth to 75% sediment and remedy the problem if
of the original design depth possible. Remove the sediment and
(see diagram below). dispose of it in a location where it
will not cause impacts to streams or
the BMP.
Erosion has occurred or Provide additional erosion
riprap is displaced. protection such as reinforced turf
matting or riprap if needed to
prevent future erosion problems.
Weeds are present. Remove the weeds, preferably by
hand. If pesticides are used, wipe
them on the plants rather than
spraying.
The main treatment area Sediment has accumulated Search for the source of the
and reduced the depth to 75% sediment and remedy the problem if
of the original design depth possible. Remove the sediment and
(see diagram below). dispose of it in a location where it
will not cause impacts to streams or
the BMP. Revegetate disturbed
areas immediately with sod
(preferred) or seed protected with
securely staked erosion mat.
Water is standing more than Check outlet structure for clogging.
5 days after a storm event. If it is a design issue, consult an
appropriate professional.
Weeds and noxious plants are Remove the plants by hand or by
growing in the main wiping them with pesticide (do not
treatment area. spray).
Form SW401-Dry Detention O&M-Rev.3 Page 2 of 4
BMP element: Potential problem: How I will remediate the problem:
The embankment Shrubs or trees have started Remove shrubs or trees
to row on the embankment. immediately.
Grass cover is unhealthy or Restore the health of the grass cover
eroding. - consult a professional if necessary.
Signs of seepage on the Consult a professional.
downstream face.
Evidence of muskrat or Use traps to remove muskrats and
beaver activity is present. consult a professional to remove
beavers.
An annual inspection by an Make all needed repairs.
appropriate professional
shows that the embankment
needs repair.
The outlet device Clogging has occurred. Clean out the outlet device. Dispose
of the sediment off-site.
The outlet device is damaged Repair or replace the outlet device.
The receiving water Erosion or other signs of Contact the NC Division of Water
damage have occurred at the Quality 401 Oversight Unit at 919-
outlet. 733-1786.
The measuring device used to determine the sediment elevation shall be such that it will
give an accurate depth reading and not readily penetrate into accumulated sediments.
When the basin depth reads 3.0 feet in the main pond, the sediment shall be removed.
When the basin depth reads 2.0 feet in the forebay, the sediment shall be removed.
BASIN DIAGRAM
ill in the blanks)
0 Temporary Pool Elevation 1191.00
Sediment Removal E 1190.00 Te porar Pool emporary
- - - - - - - - - - - - - - - -- olume Sediment Removal Elevation 1189.00 Volu/ed
BottomElevatio 1189.00 25/0 ------------
Sediment Bottom Elevation 1188.00 25% Storage Sto:
FOREBAY MAIN POND
Form SW401-Dry Detention 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:Mt. Airy-Surry County Airport - Stormwater Management Plan
BMP drainage area number: Taxiway'A' Extension South
Print name:
Address:
Signature:
Date:
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, , a Notary Public for the State of
County of , do hereby certify that
personally appeared before me this
day of , and acknowledge the due execution of the
forgoing dry detention basin maintenance requirements. Witness my hand and official
seal,
SEAL
My commission expires.
Form SW401-Dry Detention O&M-Rev.3 Page 4 of 4
Permit No.
(to be provided by DWQ)
r'"??
A O?OF W ATF9QG
?
NCDENR i Y
STORMWATER MANAGEMENT PERMIT APPLICATION FORM
401 CERTIFICATION APPLICATION FORM
WET DETENTION BASIN SUPPLEMENT
This form must be filled out, printed and submitted.
The Required Items Checklist (Part 111) must be printed, filled out and submitted along with all of the required information.
I. PROJECT INFORMATION
Project name Mt. Airy - Surry County Airport Stormwaler Management Plan
Contact person Tim Kennerly, PE
Phone number 336.662.4251
Date 28-May-11
Drainage area number Future Development
II. DESIGN INFORMATION
Site Characteristics
Drainage area 2,810,491 fe
Impervious area, post-development 1,231,441 fC
%impervious 43.82 %
Design rainfall depth 1.0 in
Storage Volume: Non-SA Waters
Minimum volume required
Volume provided
Storage Volume: SA Waters
1.5" runoff volume
Pre-development 1-yr, 24-hr runoff
Post-development 1-yr, 24-hr runoff
Minimum volume required
Volume provided
Peak Flow Calculations
Is the pre/post control of the lyr 24hr storm peak flow required?
1-yr, 24-hr rainfall depth
Rational C, pre-development
Rational C, post-development
Rainfall intensity:1-yr, 24-hr storm
Pre-development 1-yr, 24-hr peak flow
Post-development 1-yr, 24-hr peak flow
Pre/Post 1-yr, 24-hr peak flow control
Elevations
Temporary pool elevation
Permanent pool elevation
SHWT elevation (approx. at the perm. pool elevation)
Top of 10ft vegetated shelf elevation
Bottom of 10ft vegetated shelf elevation
Sediment cleanout, top elevation (bottom of pond)
Sediment cleanout, bottom elevation
Sediment storage provided
Is there additional volume stored above the state-required temp. pool?
Elevation of the top of the additional volume
196,966 fO OK
196,966 ft3
OK, volume provided is equal to or in excess of volume required.
to
to
to
to
to
y (Y or N)
2.9 in
0.64 (unitless)
0.77 (unifless)
0.12 in/hr Insufficient. Check intensity calculation.
4.96 fe/sec
5.96 fP/sec
1.00 felsec
1208.00 fmsl
1205.00 fmsl
1195.00 fmsl
1205.50 fmsl
1204.50 fmsl Data not needed for calculation option #1, but OK if provided.
1201.00 fmsl
1200.00 fmsl Data not needed for calculation option #1, but OK if provided.
1.00 ft
(Y or N)
1208.0 fmsl OK
Form SW401-Wet Detention Basin-Rev.8-9/17/09 Parts I. & II. Design Summary, Page 1 of 2
Permit No.
(to be provided by DWQ)
II. DESIGN INFORMATION
Surface Areas
Area, temporary pool 196,966 fe
Area REQUIRED, permanent pool 25,294 fe
SAIDA ratio 0.90 (unitless)
Area PROVIDED, permanent pool, Apermp d
Area, bottom of 10ft vegetated shelf, Abot shelf
Area, sediment cleanout, top elevation (bottom of pond), Abotpond
Volumes
Volume, temporary pool
Volume, permanent pool, Vpermpoa
Volume, forebay (sum of forebays if more than one forebay)
Forebay % of permanent pool volume
SAIDA Table Data
Design TSS removal
Coastal SAIDA Table Used?
Mountain/Piedmont SAIDA Table Used?
SAIDA ratio
Average depth (used in SAIDA table):
Calculation option 1 used? (See Figure 10-2b)
Volume, permanent pool, Vperm_pool
Area provided, permanent pool, Apermpool
Average depth calculated
Average depth used in SAIDA, de,,, (Round to nearest 0.5ft)
Calculation option 2 used? (See Figure 10-2b)
Area provided, permanent pool, Apermpool
Area, bottom of 1Oft vegetated shelf, Abot_shelr
Area, sediment cleanout, top elevation (bottom of pond), AboL nd
"Depth" (distance b/w bottom of 10ft shelf and top of sediment)
Average depth calculated
Average depth used in SAIDA, da,, (Round to nearest 0.5ft)
Drawdown Calculations
Drawdown through orifice?
Diameter of orifice (if circular)
Area of orifice (if-non-circular)
Coefficient of discharge (CD)
Driving head (Ho)
Drawdown through weir?
Weir type
Coefficient of discharge (C.)
Length of weir (L)
Driving head (H)
Pre-development 1-yr, 24-hr peak flow
Post-development 1-yr, 24-hr peak flow
Storage volume discharge rate (through discharge orifice or weir)
Storage volume drawdown time
Additional Information
Vegetated side slopes
Vegetated shelf slope
Vegetated shelf width
Length of flowpath to width ratio
Length to width ratio
Trash rack for overflow & orifice?
Freeboard provided
Vegetated filter provided?
Recorded drainage easement provided?
Capures all runoff at ultimate build-out?
Drain mechanism for maintenance or emergencies is:
Form SW401-Wet Detention Basin-Rev.8-9/17/09
19,666 f? Insufficient permanent pool surface area
17,042 fe
12,042 ff
196,966 ft3 OK
71,810 fO
14,362 fe
20.0%% OK
90%
n (Y or N)
y (Y or N)
0.90 (unitless)
y (Y or N)
71,810 ff3
19,666 ff
4.50 ft OK
4.5 ft OK
n (Y or N)
19,666 fe
17,042 fe
12,042 fe
3.50 ft
4.50 ft OK
4.5 ft OK
y (Y or N)
6.00 in
in2
0.60 (unitless)
0.81 ft
n (Y or N)
(unitless)
(unitless)
ft
ft
4.96 fe/sec
5.96 fP/sec
0.21 fe/sec
2.67 days
3 :1
10 :1
10.0 ft
3 :1
3.0 :1
y (Y or N)
1.0 ft
n (Y or N)
(Y or N)
y (Y or N)
OK, draws down in 2-5 days.
OK
OK
OK
OK
OK
OK
OK
OK
OK
Parts I. & II. Design Summary, Page 2 of 2
Permit Number:
(to be provided by DWQ)
Drainage Area Number:
Wet Detention Basin 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.
The wet detention basin system is defined as the wet detention basin,
pretreatment including forebays and the vegetated filter if one is provided.
This system (check one):
? does ® does not incorporate a vegetated filter at the outlet.
This system (check one):
? does ® does not incorporate pretreatment other than a forebay.
Important maintenance procedures:
Immediately after the wet detention basin is established, the plants on the
vegetated shelf and perimeter of the basin should be watered twice weekly if
needed, until the plants become established (commonly six weeks).
No portion of the wet detention pond should be fertilized after the first initial
fertilization that is required to establish the plants on the vegetated shelf.
- Stable groundcover should be maintained in the drainage area to reduce the
sediment load to the wet detention basin.
If the basin must be drained for an emergency or to perform maintenance, the
flushing of sediment through the emergency drain should be minimized to the
maximum extent practical.
- Once a year, a dam safety expert should inspect the embankment.
After the wet detention pond is established, it should be inspected once a month and
within 24 hours after every storm event greater than 1.0 inches (or 1.5 inches if in a
Coastal County). Records of operation and maintenance should be kept in a known set
location and must be available upon request.
Inspection activities shall be performed as follows. Any problems that are found shall
be repaired immediately.
BMP element: Potential problem: How I will remediate the problem:
The entire BMP Trash/debris is resent. Remove the trash/debris.
The perimeter of the wet Areas of bare soil and/or Regrade the soil if necessary to
detention basin 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.
Vegetation is too short or too Maintain vegetation at a height of
long. approximately six inches.
Form SW401-Wet Detention Basin O&M-Rev.4 Page 1 of 5
Permit Number:
(to be provided by DWQ)
Drainage Area Number:
Form SW401-Wet Detention Basin O&M-Rev.4 Page 2 of 5
Permit Number:
(to be provided by DWQ)
Drainage Area Number:
BMP element: Potential problem: How I will remediate the problem:
The inlet device: pipe or The pipe is clogged. Unclog the pipe. Dispose of the
swale sediment off-site.
The pipe is cracked or Replace the pipe.
otherwise damaged.
Erosion is occurring in the Regrade the swale if necessary to
swale. smooth it over and provide erosion
control devices such as reinforced
turf matting or riprap to avoid
future problems with erosion.
The forebay Sediment has accumulated to Search for the source of the
a depth greater than the sediment and remedy the problem if
original design depth for possible. Remove the sediment and
sediment storage. dispose of it in a location where it
will not cause impacts to streams or
the BMP.
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. If pesticide is used, wipe it on
the plants rather than spraying.
The vegetated shelf Best professional practices Prune according to best professional
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
it is necessary.
Weeds are present. Remove the weeds, preferably by
hand. If pesticide is used, wipe it on
the plants rather than spraying.
The main treatment area Sediment has accumulated to Search for the source of the
a depth greater than the sediment and remedy the problem if
original design sediment possible. Remove the sediment and
storage depth. dispose of it in a location where it
will not cause impacts to streams or
the BMP.
Algal growth covers over Consult a professional to remove
50% of the area. and control the algal growth.
Cattails, phragmites or other Remove the plants by wiping them
invasive plants cover 50 % of with pesticide (do not spray).
the basin surface.
Form SW401-Wet Detention Basin O&M-Rev.4 Page 3 of 5
Permit Number:
(to be provided by DWQ)
Drainage Area Number:
BMP element: Potential problem: How I will remediate the problem:
The embankment Shrubs have started to grow Remove shrubs immediately.
on the embankment.
Evidence of muskrat or Use traps to remove muskrats and
beaver activity is present. consult a professional to remove
beavers.
A tree has started to grow on Consult a dam safety specialist to
the embankment. remove the tree.
An annual inspection by an Make all needed repairs.
appropriate professional
shows that the embankment
needs repair. if applicable)
The outlet device Clogging has occurred. Clean out the outlet device. Dispose
of the sediment off-site.
The outlet device is damaged Repair or replace the outlet device.
The receiving water Erosion or other signs of Contact the local NC Division of
damage have occurred at the Water Quality Regional Office, or
outlet. the 401 Oversight Unit at 919-733-
1786.
The measuring device used to determine the sediment elevation shall be such
that it will give an accurate depth reading and not readily penetrate into
accumulated sediments.
When the permanent pool depth reads 3.5 feet in the main pond, the sediment
shall be removed.
When the permanent pool depth reads 2.5 feet in the forebay, the sediment
shall be removed.
BASIN DIAGRAM
(fill in the blanks)
Permanent Pool Elevation 1205
Sediment Removal
Bottom
1202 Pe manen Pool
kL2 ---------------- Volume Sediment Removal Elevation 1201 Volume
-------------------------------------------- ----win
01- Min.
Sediment Bottom Elevation 1200 1-ft Storage Sedimer
Storage
FOREBAY MAIN POND
Form SW401-Wet Detention Basin O&M-Rev.4 Page 4 of 5
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:Mt. Air -Surry County Airport - Stormwater Management Plan
BMP drainage area numberTuture Development BMP
Print nam(
Title:
Address:
Phone:
Signature:
Date:
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, , a Notary Public for the State of
County of , do hereby certify that
personally appeared before me this _
day of , and acknowledge the due execution of the
forgoing wet detention basin maintenance requirements. Witness my hand and official
seal,
SEAL
My commission expires
Form SW401-Wet Detention Basin O&M-Rev.4 Page 5 of 5
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