20051985 Ver 1_Complete File_20051028

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Michael F. Easley, Governor
William G. Ross Jr., Secretary
North Carolina Department of Environment and Natural Resources
December 21, 2005
Mr. David Goracke
Westfield Homes of the Carolinas, LLC
4112 Pleasant Valley Road
Raleigh, NC 27612
Alan W. Klimek, P.E. Director
Division of Water Quality
DWQ Project # 05-1985
Wake County
Subject Property: Seagrove's Farm
Ut to Williams Creek [030402, 27-43-2, WSIII, NSW]
Approval of 401 Water Quality Certification and Authorization Certificate per the Neuse River
Buffer Protection Rules (15A NCAC 2B.0233) with Additional Conditions
Dear Mr. Goracke:
You have our approval, in accordance with the attached conditions and those listed below, to place fill
within or otherwise impact 0.03926 acres of wetland, 317 linear feet of stream and 26,201 square feet of
Zone 1 protected Neuse riparian buffer and 19,756 square feet of Zone 2 protected Neuse riparian buffer
to construct the proposed residential subdivision at the subject property, as described within your
application dated October 28, 2005 and received by the N.C. Division of Water Quality (DWQ) on
October 28, 2005 and all additional information submitted and received by the DWQ on December 12,
2005 and December 16, 2005. After reviewing your application, we have decided that the impacts are
covered by General Water Quality Certification Number(s) 3374, 3402 (GC3374, GC3402). The
Certification(s) allows you to use Nationwide Permit(s) 12, 18 and 39 when issued by the US Army
Corps of Engineers (USACE). This letter shall also act as your approved Authorization Certificate for
impacts to the protected riparian buffers per 15A NCAC 213 .0233. In addition, you should obtain or
otherwise comply with any other required federal, state or local permits before you go ahead with your
project including (but not limited to) Erosion and Sediment Control, and Non-discharge regulations.
Also, this approval to proceed with your proposed impacts or to conduct impacts to waters as
depicted in your application shall expire upon expiration of the 404 or CAMA Permit.
This approval is for the purpose and design that you described in your application. If you change your
project, you must notify us and you may be required to send us a new application. If the property is sold,
the new owner must be given a copy of this Certification and approval letter and is thereby responsible for
complying with all conditions. If total fills for this project (now or in the future) exceed one acre of
wetland or 150 linear feet of stream, compensatory mitigation may be required as described in 15A
NCAC 211.0506 (h). This approval requires you to follow the conditions listed in the attached
certification and any additional conditions listed below.
401 0versighUExpress Review Unit
1650 Mail Service Center, Raleigh, North Carolina 27699-1650
2321 Crabtree Boulevard, Suite 250, Raleigh, North Carolina 27604
Phone: [phone] / FAX [phone] / Internet: http:/lh2o.enr.state.nc.us/ncwetlands
NM1,Carolina
AWirrally
An Equal Opportunity/Affirmative Action Employer - 50% Recycled/10% Post Consumer Paper
Westfield Homes of the Carolinas, LLC
Page 2 of 4
December 21, 2005
The Additional Conditions of the Certification are:
1. Impacts Approved
The following impacts are hereby approved as long as all of the other specific and general
conditions of this Certification (or Isolated Wetland Permit) are met. No other impacts are
approved including incidental impacts:
Amount Approved
Units Plan Location or Reference
404 Wetland 0.03926 acres Revised Impact Summa date 12/16/05
Stream 317 linear feet Revised Impact Summary date 12/16/05
Buffers - Zone 1 26,201 (square ft. Revised PCN pages 7 & 8 of 9
Buffers - Zone 2 19,756 (square ft. Revised PCN pages 7 & 8 of 9
2. Erosion & Sediment Control Practices
Erosion and sediment control practices must be in full compliance with all specifications
governing the proper design, installation and operation and maintenance of such Best
Management Practices in order to protect surface waters standards:
a. The erosion and sediment control measures for the project must be designed, installed,
operated, and maintained in accordance with the most recent version of the North Carolina
Sediment and Erosion Control Planning and Design Manual.
b. The design, installation, operation, and maintenance of the sediment and erosion control
measures must be such that they equal, or exceed, the requirements specified in the most
recent version of the North Carolina Sediment and Erosion Control Manual. The devices
shall be maintained on all construction sites, borrow sites, and waste pile (spoil) projects,
including contractor-owned or leased borrow pits associated with the project.
3. No Waste, Spoil, Solids, or Fill of Any Kind
No waste, spoil, solids, or fill of any kind shall occur in wetlands, waters, or riparian areas beyond
the footprint of the impacts depicted in the Pre-Construction Notification. All construction
activities, including the design, installation, operation, and maintenance of sediment and erosion
control Best Management Practices, shall be performed so that no violations of state water quality
standards, statutes, or rules occur.
4. Compensatory Mitigation Using Ecosystem Enhancement Program (EEP)
Mitigation must be provided for the proposed impacts as specified in the table below. We
understand that you wish to make a payment to the Wetlands Restoration Fund administered by
the NC Ecosystem Enhancement Program (EEP) to meet this mitigation requirement. This has
been determined by the DWQ to be a suitable method to meet the mitigation requirement. Until
the EEP receives and clears your check (made payable to: DENR - Ecosystem Enhancement
Program Office), no impacts specified in this Authorization Certificate shall occur. The EEP
should be contacted at [phone] if you have any questions concerning payment into a
restoration fund. You have one month from the date of this approval to make this payment. For
accounting purposes, this Authorization Certificate authorizes payment into the Wetlands
Restoration Fund to meet the following compensatory mitigation requirement:
Westfield Homes of the Carolinas, LLC
Page 3 of 4
December 21, 2005
Impact Compensatory Mitigation Required River and Sub-basin Number
Buffers -Zone 1 19,155 square feet Neuse - 03020201
Buffers - Zone 2 10,374 square feet Neuse - 03020201
5. Diffuse Flow
All constructed stormwater conveyance outlets shall be directed and maintained as diffuse flow at
non-erosive velocities through the protected stream buffers such that it will not re-concentrate
before discharging into a stream as identified within 15A NCAC 2B .0233 (5). If this is not
possible, it may be necessary to provide stormwater facilities that are considered to remove
nitrogen. This may require additional approval from this Office.
6. Protective Fencing
The outside buffer, wetland or water boundary and along the construction corridor within these
boundaries approved under this authorization shall be clearly marked with orange warning
fencing (or similar high visibility material) for the areas that have been approved to infringe
within the buffer, wetland or water prior to any land disturbing activities to ensure compliance
with 15A NCAC 2B 33 and GC 3402.
7. Construction Stormwater Permit NCGO10000
Upon the approval of an Erosion and Sedimentation Control Plan issued by the Division of Land
Resources (DLR) or a DLR delegated local erosion and sedimentation control program, an
NPDES General stormwater permit (NCGO10000) administered by DWQ is automatically issued
to the project. This General Permit allows stormwater to be discharged during land disturbing
construction activities as stipulated by conditions in the permit. If your project is covered by this
permit [applicable to construction projects that disturb one (1) or more acres], full compliance
with permit conditions including the sedimentation control plan, self-monitoring, record keeping
and reporting requirements are required. A copy of this permit and monitoring report forms may
be found at hup.-Ah2o.enr.state.ne.us/su/Fonns Documents.htm.
9. Deed Notifications
Deed notifications or similar mechanisms shall be placed on all retained jurisdictional wetlands,
waters and protective buffers in order to assure compliance for future wetland, water and buffer
impact. These mechanisms shall be put in place prior to impacting any wetlands, waters and/or
buffers approved for impact under this Certification Approval and Authorization Certificate. A
sample deed notification can be downloaded from the 401[Wetlands Unit web site at
http://h2o.enr.state.ne.us/ncwetiands. The text of the sample deed notification may be modified
as appropriate to suit to this project.
10. Culvert Installation
Installation of culverts in wetlands must ensure continuity of water movement and be designed to
adequately accommodate high water or flood conditions.
Westfield Homes of the Carolinas, LLC
Page 4 of 4
December 21, 2005
11. No Sediment & Erosion Control Measures w/n Wetlands or Waters
Sediment and erosion control measures shall not be placed in wetlands or waters to the maximum
extent practicable. If placement of sediment and erosion control devices in wetlands and waters
is unavoidable, they shall be removed and the natural grade restored within six months of the date
that the Division of Land Resources has released the project.
12. Certificate of Completion
Upon completion of all work approved within the 401 Water Quality Certification or applicable
Buffer Rules, and any subsequent modifications, the applicant is required to return the attached
certificate of completion to the 401/Wetlands Unit, North Carolina Division of Water Quality,
1650 Mail Service Center, Raleigh, NC, 27699-1650.
Violations of any condition herein set forth may result in revocation of this Certification and may result in
criminal and/or civil penalties. The authorization to proceed with your proposed impacts or to conduct
impacts to waters as depicted in your application and as authorized by this Certification, shall expire upon
expiration of the 404 or CAMA Permit.
If you do not accept any of the conditions of this Certification (associated with the approved wetland or
stream impacts), you may ask for an adjudicatory hearing. You must act within 60 days of the date that
you receive this letter. To ask for a hearing, send a written petition, which conforms to Chapter 150B of
the North Carolina General Statutes to the Office of Administrative Hearings, 6714 Mail Service Center,
Raleigh, N.C. 27699-6714. This certification and its conditions are final and binding unless you ask for a
hearing.
Any disputes over determinations regarding this Authorization Certificate (associated with the approved
buffer impacts) shall be referred in writing to the Director for a decision. The Director's decision is
subject to review as provided in Articles 3 and 4 of G.S. 150B.
This letter completes the review of the Division of Water Quality under Section 401 of the Clean Water
Act and the Neuse riparian buffer protection rule as described within 15A NCAC 2B .0233. If you have
any questions, please telephone Cyndi Karoly at 919-733-1786.
AWK/ijm
Sincerely,
Alan W. Klimek, P.E.
Enclosures: GC 3374 and GC 3402
Certificate of Completion
cc: Sean Clark, Soil & Environmental Consultants, P.A., 11010 Raven Ridge Road, Raleigh, NC 27614
USACE Raleigh Regulatory Field Office
Eric Kulz, DWQ Raleigh Regional Office
DLR Raleigh Regional Office
File Copy
Central Files
Filename: 051985 SeagrovesFarm(Wake)401+NBR
a
12%16%20U5 17:43 FAT

4 DIVO DORINET Uoul
Soil & Environmental Consultants, PA
1101() Raveal Ri.lge Road - Raleigh, North Carolina 27614 • Phone-- [phone] - Fax: [phone]
www.SandEC.cocn
FACSIMILE SHEET
,FAX NO. [phone]
DATE:
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TO. NAME
COMPANY: 1)w
FAX NUMBER:.
SUBJECT:
FROM.
The following items are being faxed. Number of pages including transmittal sheet:
For Your Comments/[tpproval For Your Information
-- - Per Our Conversation Per Your Request
Please Advise Please Call
Would Like To Discuss X Please Handle
HARD COPY SENT:
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IF YOU HAVE ANY PROI-LE MS WITI-I TI-IIS TRANSMIS$10N, PLEASE
CONTACT AT [phone],
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franSC iSSiOn to error, please notify u:• immediately by telephone and return the faxed documents to us at the above address
N1a the United Swtcs Fost il Servica.
t ?reG C faro n ?e•?r nttp office: 3317-E Lawndale Drivc
236 L Pbillip Court. Suite C Greensboro. NC 27455
Concord. NC N025 Phonc:. (336) 540-&234
CiEC-1G-;?00" FRI 17:-41 TEL: 919=H-093 IJAHE: DWO-NETLAt IDS F. 1
13.16.2005 17:33 FAT

D1Fc1 DORNEI 0003
Soil & Environmental Consultants, PA
11010 Raven Rid.;e Road • Ralcigh, North Carolina 27614 • Phone: [phone] , Fax: [phone]
To: US Army Corps of Engineers
Raleigh Regulatory Field Office
Attn: Monte l`AattheW3
6508 Falls of the Neuse Road
Suite 120
Raleigh, NC 27615
From: Sean Clark
Soil & Environmental Consultants, P.A.
11010 Raven Ridge load
Raleigh, NC 27614
Re: Seagrove's Farm
Apex, NC
www.SandEC.com October 28, 2005
S&EC Project # 7416.w1
N.C. Division of Water Quality
401 Oversight and Express Permits Unit
Attn: Cyndi Karoly
2321 Crabtree Boulevard
Suite 250
Raleigh, NC 27604-2260
On behalf of the owner, Westfield Homes of the Carolinas, LLC, please find attached a complete
application and supplementa information requesting written concurrence from the U.S. Army
Corps of Engineers (USACE; that the activities proposed below may proceed under Nationwide
Permits 12, 18, and 39 and General Water Quality Certifications 3374 and 3402. Please contact
me at [phone] if you have any questions or require additional information. In addition,
please consider this applicatf-3n our request for a no practical alternatives determination and
Authorization Certificate for impacts to riparian buffers protected under the Neuse Buffer Rule.
PROJECT SUMMARY
Project Name Sea grove's Farm
Project T : Residential Subdivision
Owner / A lic:ant Westfield Homes of the Carolinas
Count Wake
Nearest Town Apex
Water Body N;jme UT to Williams Creek
Basin / Sub-basin Neuse 03-04-02
Index Numbsr 27-43-2
Class WS-III, NSW
IMPACT SUMMARY
Stream Impact (acre:::): 0.05101 ac
Wetland Impact acres : 0.03926 ac
Open Water Impact (acres): 0.0 ac
Total Impact to Waters of the U.S. (acres) 0.09027 ac
Total Stream Impact (linear feet): 317 LF"
Total Impact to Buffe's 45,907 ft
Attachments:
• Pre-construct an M ficati,m (PCN) Application Impact Maps
• Agent Authorization
• USGS Nap
• Wake County Soil Survey Map
• Pictures of Impact 13 IocaJon
• Overall Map
r'harlnttQ ofhCC: Greensborn OBicc:
236 LePhillip Court, Suite C 3817-1r Lawndale Drier
ConcorJ, NC 25025 Greensboro, NC 27455
Phone: [phone] Phone: [phone]
Fax: [phone] Fa7: [phone]
DEC-16-811105 FRI 17:41 TEL:919733b893 HAME:DWQ-t,IETLR1IDS P. 2
12. 16. 2005 17:43 FAX DIVQ DORNEI 0003
IX. Environmental Documentation (required by DWQ)
1. Does the project involve an expenditure of public (federal/state/local) funds or the use of
public (federal/state) laid? Yes ? No 0
2. If yes, does the project require preparation of an envirommental document pursuant to the
requirements of the National or North Carolina Environmental Policy Act (NEPAiSEPA)?
Note: if you are not sure whether a NEPA/SEPA document is required, call the SEPA
coordinator at (919) 73.3-5083 to review current thresholds for environmental documentation.
Yes ? No ?
3. If yes, has the document review been finalized by the State Clearinghouse? ff so, please
attach a copy of the NEPA or SEPA final approval letter. Yes ? No ?
X. Proposed Impacts on Riparian and Watershed Buffers (required by DWQ)
It is the applicant's (or agent's) responsibility to determine, delineate and map all impacts to
required state and local buffers associated with the project. The applicant must also provide
justification for these imparts in Section VII above. All proposed impacts must be listed herein,
and must be clearly identifiable on the accompanying site plan. All buffers must be shown on a
map, whether or not imp.tcts are proposed to the buffers. Correspondence from the DWQ
Regional Office may be included as appropriate. Photographs may also be included at the
applicant's discretion.
1. Will the project impact protected riparian buffers identified within 15A NCAC 213 .0233
(Neuse), 15A NCAC Z .0259 (Tar-.Pamlico), 15A NCAC 02B .0243 (Catawba) 15A NCAC
213 .0250 (Randleman Rules and Water Supply Buffer Requirements), or other (please
identify )? Yes ?G No ?
2. if "yes", identify the square feet and acreage of impact to each zone of the riparian buffers.
If buffer mitigation is required calculate the required amount of mitigation by applying the
buffer multipliers.
Per endicular Impacts Not Requiring Mitigation
Impact Required
Zone' --- r-- Multiplier ?"V4". .,,1;-
1 1 19,816 1 3 (2 for Catawba) 0 1
2 11,739 1.5 0
Total 31,554 0
imr.art 17 (Nnnnernendicular Utility Crossinz)
Impact Required
Zone" uare feet Multiplier N1itination
1 2,714 3 (2 for Catawba) 8,142
2 1,102 1.5 0
Total 3,816 8,142
Page 7 of 9
DEC-16-2008 FRI 17:41 TEL:[phone] NAME: U-10-WETLANDS P. 3
t
12,'16,'2U05 17:43 FAX
-o DIVQ DORNEY
Imnact to (Nonverpendicular Portion of Road Crossing)
7_one* Impact
(square feet) Multiplier
I Required
Mitigation
i 3,671 3 (2 for Catawba) 11,013
2 6,916 1.5 10,374
Total 10,537 21,387
s Zone 1 extends out 3 ) feet perpendicular from the top of the near bank of charnel; Zone 2 extends an
additional 20 feet from the edge oFZonc I.
XI.
X1I.
U004
3. If buffer mitigation is required, please discuss what type of mitigation is proposed (i.e.,
Donation of Property, Riparian Buffer Restoration / Enhancement, or Payment into the
Riparian Buffer Restoration Fund). Please attach all appropriate information as identified
within 15A NCAC 2B .0242 or .0244, or .0260. Pavtnent to the NC-EEP is proposed to
satisfy the re uired i>tlffer mitigation. SkEC does not believe that the proposed
nonperpendicular buffer impacts at Impact 6 should require mitigation because the dam is
already being used as a.road crossing, (i.e. an existing u. e) however if mitigation is proposed
payment to the NC-EEl' is proposed
Stormwater (required by DWQ)
Describe impervious acrea;;e (existing and proposed) versus total acreage on the site. Discuss
stonmwater controls propos cd in order to protect surface waters and wetlands downstream from
the property. If percent impervious surface exceeds 20%, please provide calculations
demonstrating total proposed impervious level- The overall impervious surface area is less than
30% therefore a stonmwater plan is not being submitted for DWQ approval. A more densely
concentrated area exists c n the southeasteni portion of the property that will exceed 30°
impervious. The stonnwater wetland that has been designed to treat this stonnwater will meet
DWQ standards. Addition.-Illy, stonmwater is being treated on site in six additional areas as per
the Town of Apex's requirements.
Sewage Disposal (required by DWQ)
Clearly detail the ultimate treatment methods and disposition (non-discharge or discharge) of
wastewater generated from the proposed project, or available capacity of the subject facility.
The properly will tie into existing Town of Apex sewer lines on adjacent properties.
VIII. Violations (required by DWQ)
Is this site in violation of DWQ Wetland Rules (15A NCAC 2H .0500) or any Buffer Rules?
Yes ? No H
1s this an after-the-fact pemiit application? Yes ? No Z
Page 8 of 9
DEC-16-2005 FPI 17:41 TEL:[phone] NAME: DWQ-WETLAtIDS
P. 4
?0F W AT F90 Michael F. Easley, Governor
?0 ^ L William G. Ross Jr., Secretary
1 T North Carolina Department of Environment and Natural Resources
Alan W. nmek, P.E. Director
Division of Water Quality
December 5, 2005
DWQ Project # 05-1985
Wake County
CERTIFIED MAIL: RETURN RECEIPT REQUESTED
Mr. David Goracke
Westfield Homes of the Carolinas, LLC
4112 Pleasant Valley Road
Raleigh, NC 27612
Subject Property: Seagrove's Farm
Ut to Williams Creek [030402, 27-43-2, WSIII, NSW]
REQUEST FOR MORE INFORMATION
Dear Mr. Goracke:
On October 28, 2005, the Division of Water Quality (DWQ) received your application dated
October 28, 2005, to impact 0.039 acres of wetland, 317 linear feet of stream, and 16,271 square
feet of Zone 1 protected Neuse riparian buffer and 20,699 square feet of Zone 1 protected Neuse
riparian buffer to construct the proposed residential subdivision. The DWQ has determined that
your application was incomplete and/or provided inaccurate information as discussed below.
The DWQ will require additional information in order to process your application to impact
protected wetlands and/or streams on the subject property. Therefore, unless we receive the
additional information requested below, we will have to move toward denial of your application
as required by 15A NCAC 2H.0506 and will place this project on hold as incomplete until we
receive this additional information. Please provide the following information so that we may
continue to review your project.
Additional Information Requested:
1. Please provide diffuse flow provision measures (level spreaders along with worksheets
showing how they were designed) and show them on the site plans.
2. Please provide separate impact maps for each individual buffer impact, as is typical of
applications submitted by your company. These separate drawings were not provided for
this particular application, and we find them very helpful in interpreting your project
plans.
401 Oversight/Express Review Permitting Unit
1650 Mail Service Center, Raleigh, North Carolina 27699-1650
2321 Crabtree Boulevard, Suite 250, Raleigh, North Carolina 27604
Phone: [phone] /FAX [phone] / Internet: hufr Ill?o.enr.statc.nc.uvnc??ctlands
None Carolina
NturallY
An Equal Opportunity/Affirmative Action Employer - 50% Recycled/10% Post Consumer Paper
Westfield Homes of the Carolinas, LLC +
Page 2 of 2
December 5, 2005
Please respond within three weeks of the date of this letter by sending this information to me in
writing and Eric Kulz of the DWQ Raleigh Regional Office. If we do not hear from you within
three weeks, we will assume that you no longer want to pursue this project and we will consider
the project as withdrawn.
This letter only addresses the application review and does not authorize any impacts to wetlands,
waters or protected buffers. Please be aware that any impacts requested within your application
are not authorized (at this time) by the DWQ. Please call Ms. Cyndi Karoly or Mr. Ian
McMillan at 919-733-1786 if you have any questions regarding or would like to set up a meeting
to discuss this matter.
Sincerely,
'/ -a?
Cyndi Karoly, Supervisor
401 Oversight/Express Review Permitting Unit
CBK/ijm
cc: Eric Kulz, DWQ Raleigh Regional Office
USACE Raleigh Regulatory Field Office
File Copy
Central Files
Sean Clark, Soil & Environmental Consultants, P.A., 11010 Raven Ridge Road, Raleigh, NC
27614
Filename: 0519855 cagrovesFarm(Wake)On_Iiold
vxti . ............._ .
Subject: DWQ # 05-1985 Seagrove's Farm
From: Laurie Dennison <[e-mail]>
Date: Mon, 05 Dec 2005 12:40:13 -0500
To: [e-mail]
CC: [e-mail]
Please see attached the Division of Water Quality's request for more information
related to your recent application. Please note that this message is being forwarded
to you electronically so that you may expedite preparation of your response. Please
do not send your response as a reply to this e-mail or via fax. The hard copy is
being sent via US Mail. All response correspondence is to be mailed via hard copy to
the 401 Oversight and Express Permits Unit, 2321 Crabtree Blvd., Raleigh, NC, 27604
unless otherwise noted.
051985SeagrovesFarm(Wake)On Hold.doc Content-Type: application/msword
Content-Encoding: base64
1 of 1 12/5/2005 12:40 PM
Seagroves Farm 20051985 Wake Co.
Subject: Seagroves Farm 20051985 Wake Co.
From: Eric Kulz <[e-mail]>
Date: Mon, 05 Dec 2005 09:37:16 -0500
To: Ian McMillan <[e-mail]>
Ian:
I recommend asking for each buffer impact to be presented separately. S&EC usually
does this on their impact maps, and I don't know why they didn't do it this time. It
is not particularly clear to me what the allowable and allowable with mitigation
buffer impacts are. In particular, I would like to know at Impact #6 the amount of
perpendicular impacts and the amount of other (non-perpendicular) impacts.
Also, regarding your comment about an I/P call at Impact 13, the impact is just
downstream from the stream origin, and the drainage area above the origin is small.
That, combined with the photos included, tend to make me think that the stream is
intermittent.
I tried to enter my comments in BIMS, but the program freaked out on me and put me
into a loop involving system failure and ETU tickets.
Eric Kulz <Eric.KulzRcncmail.net>
Environmental Specialist III
Surface Water Protection
NC Division of Water Quality
1 of 1 12/5/2005 9:43 AM
Triage Check Dist
Date; Projett Name: P,r n
DWQ#: ?OJ S
County: Ire-
To: ? ARO Kevin Barnett. ? Wa.RO Tom Steffens and Kyle Bames
? FRO Ken Averitte ? WiRO Noelle Lutheran
? MRO Alan Johnson ? WSRO Daryl Lamb
0--'RRO Mike Horan
om: AC Telephone : (919)
Fr
The file attached. Is being forwarded" o-I our for your evaluation.
Please call if you need' as' Lance.
? Stream length impacted ) f/',1 e S'v ie ;? f
Stream determination
? Wetland determination and distance to blue-lim surface?Qers on USI?W topo maps
? Minimi ation/avoidance issues
L_'1 Buffer Rules Tar-Pamlico, Catawba, Randleman)
? Pond fill
? Mitigation Ratios
? Ditching
? Are the stream and or wetland mitigation sites available and viable?
? Check drawings for accuracy
? Is the application consistent with pre-application meetings? -
? Cumulative impact concern
Comments: ? e
?lS/)
?n l I ?i' Gr? I?)n S il-.C I? f 1
00
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Soil & Environ mental Consultants, PA

i 11010 Raven Ridge Road • Raleigh, North Carolina 27614 • Phone: [phone] • Fax: [phone]
t'
www.SandEC.com
October 28, 2005
S&EC Project # 7416.w1
To: US Army Corps of Engineers N.C. Division of Water Quality
Raleigh Regulatory Field Office 401 Oversight and Express Permits Unit
Attn: Monte Matthews Attn: Cyndi Karoly
6508 Falls of the Neuse Road 2321 Crabtree Boulevard
Suite 120 Suite 250
Raleigh, NC 27615 Raleigh, NC 27604-2260
From: Sean Clark
Soil & Environmental Consultants, P.A.
(f
11010 Raven Ridge Road
Raleigh, NC 27614 OCT 2 2005
Re: Seagrove's Farm
Apex
NC SFr ?iENr<< t-?,Z?t'!; Gilts 17Y
uSr?DSP?r7
yfa-:f
i
, .
it
1??rt?Jy
On behalf of the owner, Westfield Homes of the Carolinas, LLC, please find attached a complete
application and supplemental information requesting written concurrence from the U.S. Army
Corps of Engineers (USACE) that the activities proposed below may proceed under Nationwide
Permits 12, 18, and 39 and General Water Quality Certifications 3374 and 3402. Please contact
me at [phone] if you have any questions or require additional information. In addition,
please consider this application our request for a no practical alternatives determination and
Authorization Certificate for impacts to riparian buffers protected under the Neuse Buffer Rule.
PROJECT SUMMARY
Project Name Sea grove's Farm
Project Type Residential Subdivision
Owner / Applicant Westfield Homes of the Carolinas
Count Wake
Nearest Town Apex
Water Body Name UT to Williams Creek
Basin / Sub-basin Neuse 03-04-02
Index Number 27-43-2
Class WS-III, NSW
IMPACT SUMMARY
Stream Impact (acres): 0.05101 ac
Wetland Impact acres : 0.03926 ac
Open Water Impact (acres): 0.0 ac
Total Impact to Waters of the U.S. (acres) 0.09027 ac
Total Stream Impact (linear feet): 317 LF*
Total Impact to Buffers 48,425 ft
Attachments:
• Pre-construction Notification (PCN) Application Impact Maps
• Agent Authorization
• USGS Map
• Wake County Soil Survey Map
• Pictures of Impact 13 location
• Overall Map
Charlotte Office:
236 LePhillip Court, Suite C
Concord, NC 28025
Phone: [phone]
Fax: [phone]
Greensboro Office:
3817-E Lawndale Drive
Greensboro, NC 27455
Phone: [phone]
Fax: [phone]
Office Use Only: Form Vcrsion March 05
USACE Action ID No. DWQ No.
(If any particular item is not applicable to this project, please enter "Not Applicable" or "N/A".)
1. Processing
1. Check all of the approval(s) requested for this project:
® Section 404 Permit ® Riparian or Watershed Buffer Rules
? Section 10 Permit ? Isolated Wetland Permit from DWQ
® 401 Water Quality Certification ? Express 401 Water Quality Certification
2. Nationwide, Regional or General Permit Number(s) Requested: NWP 12, 18, and 39
3. If this notification is solely a courtesy copy because written approval for the 401 Certification
is not required, check here: ?
4. If payment into the North Carolina Ecosystem Enhancement Program (NCEEP) is proposed
for mitigation of impacts, attach the acceptance letter from NCEEP, complete section VIII,
and check here: ?
5. If your project is located in any of North Carolina's twenty coastal counties (listed on page
4), and the project is within a North Carolina Division of Coastal Management Area of
Environmental Concern (see the top of page 2 for further details), check here: ?
II. Applicant Information , 1 @rn L-CS D
1. Owner/Applicant Information Cga5
Name: Westfield Homes of the Carolinas LLC 11. Y
Mailing Address: Attn: David Goracke
4112 Pleasant Valley Road
Raleigh NC 27612
Telephone Number: 919-868-6567 Fax Number: 919-789-9200
E-mail Address: d org_ acke@a stanpac.com
2. Agent/Consultant Information (A signed and dated copy of the Agent Authorization letter
must be attached if the Agent has signatory authority for the owner/applicant.)
Name: Sean Clark
Company Affiliation: Soil & Environmental Consultants, PA
Mailing Address: 11010 Raven Ridge Road
Raleigh NC 27614
Telephone Number: 919-846-5900 Fax Number: 919-846-9467
E-mail Address: [e-mail]
Page 1 of 9
III. Project Information
Attach a vicinity map clearly showing the location of the property with respect to local
landmarks such as towns, rivers, and roads. Also provide a detailed site plan showing property
boundaries and development plans in relation to surrounding properties. Both the vicinity map
and site plan must include a scale and north arrow. The specific footprints of all buildings,
impervious surfaces, or other facilities must be included. If possible, the maps and plans should
include the appropriate USGS Topographic Quad Map and NRCS Soil Survey with the property
boundaries outlined. Plan drawings, or other maps may be included at the applicant's discretion,
so long as the property is clearly defined. For administrative and distribution purposes, the
USACE requires information to be submitted on sheets no larger than 11 by 17-inch format;
however, DWQ may accept paperwork of any size. DWQ prefers full-size construction
drawings rather than a sequential sheet version of the full-size plans. If full-size plans are
reduced to a small scale such that the final version is illegible, the applicant will be informed that
the project has been placed on hold until decipherable maps are provided.
1. Name of project: Seagrove's Farms Subdivision
2. T.I.P. Project Number or State Project Number (NCDOT Only): N/A
3. Property Identification Number (Tax PIN): 0752009681
4. Location
County: Wake County Nearest Town: Apex
Subdivision name (include phase/lot number): Seagrove's Farm
Directions to site (include road numbers/names, landmarks, etc.): The project site is located
immediately north of Center Street (SR 1010) at a point approximately 700 feet west of the
intersection of Highway 1 and Center Street in Apex, NC.
5. Site coordinates (For linear projects, such as a road or utility line, attach a sheet that
separately lists the coordinates for each crossing of a distinct waterbody.)
Decimal Degrees (6 digits minimum): 35.7285 ON 78.8283 °W
6. Property size (acres): +/- 68 acres
7. Name of nearest receiving body of water: UT to Williams Creek
8. River Basin: Neuse River Basin
(Note - this must be one of North Carolina's seventeen designated major river basins. The
River Basin map is available at http://h2o.enr.state.nc.us/admin/maps/.)
9. Describe the existing conditions on the site and general land use in the vicinity of the project
at the time of this application: The majority of the site is a pasture that has not been tended
in approximately 2 years. The surrounding properties are primarily single-family residential
subdivisions.
Page 2 of 9
10. Describe the overall project in detail, including the type of equipment to be used: The
proposed project will be a residential subdivision. The majority of the site will be single
family free standing homes however a portion of the property will be town home type
structures Also an approximately 10-acre portion of the property will be a town nark
(passive use with no pools buildings etc.. Heavy equipment typically used for road
construction and grading will be utilized on this project.
11. Explain the purpose of the proposed work: The proposed project will provide additional
housing for the area to meet demand. Proposed impacts will result primarily from road and
other utility crossings required to properly service and access the project.
IV. Prior Project History
If jurisdictional determinations and/or permits have been requested and/or obtained for this
project (including all prior phases of the same subdivision) in the past, please explain. Include
the USACE Action ID Number, DWQ Project Number, application date, and date permits and
certifications were issued or withdrawn. Provide photocopies of previously issued permits,
certifications or other useful information. Describe previously approved wetland, stream and
buffer impacts, along with associated mitigation (where applicable). If this is a NCDOT project,
list and describe permits issued for prior segments of the same T.I.P. project, along with
construction schedules. DWQ conducted a field meetinu on November 20, 2002 to determine
the extents of the buffers (NBRRO # 03-034) S&EC delineated the jurisdictional features on the
property in 2003 The delineation was approved by the USACE on April 19, 2004 (Action ID #
200420787) No previous permits have been requested or issued for the site. Pictures of the
drainage being crossed at Impact 13 are attached to this submittal.
V. Future Project Plans
Are any future permit requests anticipated for this project? If so, describe the anticipated work,
and provide justification for the exclusion of this work from the current application.
No future permits are expected to be required at this time.
VI. Proposed Impacts to Waters of the United States/Waters of the State
It is the applicant's (or agent's) responsibility to determine, delineate and map all impacts to
wetlands, open water, and stream channels associated with the project. Each impact must be
listed separately in the tables below (e.g., culvert installation should be listed separately from
riprap dissipater pads). Be sure to indicate if an impact is temporary. All proposed impacts,
permanent and temporary, must be listed, and must be labeled and clearly identifiable on an
accompanying site plan. All wetlands and waters, and all streams (intermittent and perennial)
should be shown on a delineation map, whether or not impacts are proposed to these systems.
Wetland and stream evaluation and delineation forms should be included as appropriate.
Photographs may be included at the applicant's discretion. If this proposed impact is strictly for
wetland or stream mitigation, list and describe the impact in Section VIII below. If additional
space is needed for listing or description, please attach a separate sheet.
Page 3 of 9
1. Provide a written description of the proposed impacts: Proposed impacts result primarily
from road and utility crossings. A stormwater pond is proposed and will impact 957 ft2 of
jurisdictional wetland.
2. Individually list wetland impacts. Types of impacts include, but are not limited to
mechanized clearing, grading, fill, excavation, flooding, ditching/drainage, etc. For dams,
se aratel list impacts due to both structure and floodin .
Wetland Impact Type of Wetland Located within Distance to Area of
Site Number Type of Impact (e.g., forested, marsh, 100-year Nearest Impact
(indicate on map) herbaceous, bog, etc.) Floodplain Stream (acres)
es/no linear feet
Impact 3 Permanent Headwater wetland
No
+/- 500'
0.02197
(NWP 18) Flooding/Fill (herbaceous)
Impact 4 Permanent Headwater wetland No +/- 550" 0
00691
(NWP 39) Road Fill (herbaceous) .
Impact 11 Permanent Headwater wetland No +/_1001 0
01038
(NWP 39) Road Fill (herbaceous) .
Total Wetland Impact (acres) 0.03926
3. List the total acreage (estimated) of all existing wetlands on the property: +/- 0.5 acres
4. Individually list all intermittent and perennial stream impacts. Be sure to identify temporary
impacts. Stream impacts include, but are not limited to placement of fill or culverts, dam
construction, flooding, relocation, stabilization activities (e.g., cement walls, rip-rap, crib
walls, gabions, etc.), excavation, ditching/straightening, etc. If stream relocation is proposed,
plans and profiles showing the linear footprint for both the original and relocated streams
must be included. To calculate acreage, multi 1 length X width, then divide b 43,560.
Stream Impact Average Impact Area of
Number Stream Name Type of Impact Perennial Stream Width Length Impact
indicate on ma Intermittent? t? Before Impact linear feet acres
Impact 6 UT to Williams Permanent Perennial
1 91 LF 0
02107
(NWP 39) Creek Road Fill/ culvert +/_10 .
Impact 9 UT to Williams Temporary Perennial 40 LF 0
01079
(NWP 12) Creek Excavation .
Impact 12 UT to Williams Temporary Intermittent
' 40 LF 0
00448
(NWP 12) Creek Excavation +/- 4 .
Impact 13 UT to Williams Permanent Intermittent
' 146 LF 0
01467
(NWP 39) Creek Road Fill/ culvert +/- 4 .
Total Stream Impact (by length and acreage) 317 LF 0.05101
5. Individually list all open water impacts (including lakes, ponds, estuaries, sounds, Atlantic
Ocean and any other water of the U.S.). Open water impacts include, but are not limited to
fill, excavation, dredging, flooding, drainage, bulkheads, etc.
Open Water Impact Name of Waterbody Type of Waterbody Area of
Site Number (if applicable) Type of Impact (lake, pond, estuary, sound, bay, Impact
indicate on ma ocean, etc. acres
N/A N/A N/A N/A N/A
Total Open Water Impact (acres) N/A
Page 4 of 9
6. List the cumulative impact to all Waters of the U.S. resulting from the project:
Stream Im act (acres : 0.05101
Wetland Impact (acres): 0.03926
Open Water Impact acres : 0
Total Impact to Waters of the U.S. (acres) 0.09027
Total Stream Impact linear feet): 317 LF
7. Isolated Waters
Do any isolated waters exist on the property? ? Yes ® No
Describe all impacts to isolated waters, and include the type of water (wetland or stream) and
the size of the proposed impact (acres or linear feet). Please note that this section only
applies to waters that have specifically been determined to be isolated by the USACE.
There are no isolated wetlands/streams on the property.
8. Pond Creation
If construction of a pond is proposed, associated wetland and stream impacts should be
included above in the wetland and stream impact sections. Also, the proposed pond should
be described here and illustrated on any maps included with this application.
Pond to be created in (check all that apply): ? uplands ? stream ? wetlands
Describe the method of construction (e.g., dam/embankment, excavation, installation of
draw-down valve or spillway, etc.): N/A
Proposed use or purpose of pond (e.g., livestock watering, irrigation, aesthetic, trout pond,
local stormwater requirement, etc.): N/A
Current land use in the vicinity of the pond: N/A
Size of watershed draining to pond: N/A Expected pond surface area: N/A
VII. Impact Justification (Avoidance and Minimization)
Specifically describe measures taken to avoid the proposed impacts. It may be useful to provide
information related to site constraints such as topography, building ordinances, accessibility, and
financial viability of the project. The applicant may attach drawings of alternative, lower-impact
site layouts, and explain why these design options were not feasible. Also discuss how impacts
were minimized once the desired site plan was developed. If applicable, discuss construction
techniques to be followed during construction to reduce impacts. Proposed impacts have been
minimized by usine pemendicular road crossings, retaining walls and avoiding general lot _fill.
The pond on site is contained within an area that will be a passive use Town of Apex Park. The
proposed road crossing immediately below the existing dam is required in order to gain access to
the northern portion of the property. The road crossing connecting the project to the adjacent
subdivision to the east is required by the Town of Apex for interconnectivity purposes and will
tie into a fixed road stub.
VIII. Mitigation
DWQ - In accordance with 15A NCAC 2H .0500, mitigation may be required by the NC
Division of Water Quality for projects involving greater than or equal to one acre of impacts to
Page 5 of 9
freshwater wetlands or greater than or equal to 150 linear feet of total impacts to perennial
streams.
USACE - In accordance with the Final Notice of Issuance and Modification of Nationwide
Permits, published in the Federal Register on January 15, 2002, mitigation will be required when
necessary to ensure that adverse effects to the aquatic environment are minimal. Factors
including size and type of proposed impact and function and relative value of the impacted
aquatic resource will be considered in determining acceptability of appropriate and practicable
mitigation as proposed. Examples of mitigation that may be appropriate and practicable include,
but are not limited to: reducing the size of the project; establishing and maintaining wetland
and/or upland vegetated buffers to protect open waters such as streams; and replacing losses of
aquatic resource functions and values by creating, restoring, enhancing, or preserving similar
functions and values, preferable in the same watershed.
If mitigation is required for this project, a copy of the mitigation plan must be attached in order
for USACE or DWQ to consider the application complete for processing. Any application
lacking a required mitigation plan or NCEEP concurrence shall be placed on hold as incomplete.
An applicant may also choose to review the current guidelines for stream restoration in DWQ's
Draft Technical Guide for Stream Work in North Carolina, available at
http://h2o.enr.state.nc.us/ncwetiands/strmgide.html.
1. Provide a brief description of the proposed mitigation plan. The description should provide
as much information as possible, including, but not limited to: site location (attach directions
and/or map, if offsite), affected stream and river basin, type and amount (acreage/linear feet)
of mitigation proposed (restoration, enhancement, creation, or preservation), a plan view,
preservation mechanism (e.g., deed restrictions, conservation easement, etc.), and a
description of the current site conditions and proposed method of construction. Please attach
a separate sheet if more space is needed.
Payment to the NC-EEP is proposed for the proposed permanent impacts to the perennial
stream channel on the property.
2. Mitigation may also be made by payment into the North Carolina Ecosystem Enhancement
Program (NCEEP). Please note it is the applicant's responsibility to contact the NCEEP at
[phone] to determine availability, and written approval from the NCEEP indicating
that they are will to accept payment for the mitigation must be attached to this form. For
additional information regarding the application process for the NCEEP, check the NCEEP
website at http://h2o.enr.state.nc.us/wrp/index.htm. If use of the NCEEP is proposed, please
check the appropriate box on page five and provide the following information:
Amount of stream mitigation requested (linear feet): 91 LF
Amount of buffer mitigation requested (square feet): 8,142 ft2
Amount of Riparian wetland mitigation requested (acres): 0
Amount of Non-riparian wetland mitigation requested (acres): 0
Amount of Coastal wetland mitigation requested (acres): 0
Page 6 of 9
IX.
X.
Environmental Documentation (required by DWQ)
1. Does the project involve an expenditure of public (federal/state/local) funds or the use of
public (federal/state) land? Yes ? No
2. If yes, does the project require preparation of an environmental document pursuant to the
requirements of the National or North Carolina Environmental Policy Act (NEPA/SEPA)?
Note: If you are not sure whether a NEPA/SEPA document is required, call the SEPA
coordinator at [phone] to review current thresholds for environmental documentation.
Yes ? No ?
3. If yes, has the document review been finalized by the State Clearinghouse? If so, please
attach a copy of the NEPA or SEPA final approval letter. Yes ? No ?
Proposed Impacts on Riparian and Watershed Buffers (required by DWQ)
It is the applicant's (or agent's) responsibility to determine, delineate and map all impacts to
required state and local buffers associated with the project. The applicant must also provide
justification for these impacts in Section VII above. All proposed impacts must be listed herein,
and must be clearly identifiable on the accompanying site plan. All buffers must be shown on a
map, whether or not impacts are proposed to the buffers. Correspondence from the DWQ
Regional Office may be included as appropriate. Photographs may also be included at the
applicant's discretion.
1. Will the project impact protected riparian buffers identified within 15A NCAC 2B .0233
(Neuse), 15A NCAC 213 .0259 (Tar-Pamlico), 15A NCAC 02B .0243 (Catawba) 15A NCAC
2B .0250 (Randleman Rules and Water Supply Buffer Requirements), or other (please
identify V Yes ® No ?
2. If "yes", identify the square feet and acreage of impact to each zone of the riparian buffers.
If buffer mitigation is required calculate the required amount of mitigation by applying the
buffer multipliers.
Perpendicular Impacts Not Reouirinu Mitiization
Zone* Impact
(square feet Multiplier Required
Mitigation
1 9,886 3 (2 for Catawba) 0
2 12,681 1.5 0
Total 22,567 0
Impact 12 (Nonperpendicular Utility Crossing)
Zone* Impact
(square feet Multiplier Required
Mitigation
1 2,714 3 (2 for Catawba) 8,142
2 1,102 1.5 0
Total 3,816 8,142
Page 7 of 9
Impact 6 (Nonperpendicular Portion of Road Crossing)
Zone* Impact
(square feet Multiplier Required
Miti ation
1 3,671 3 (2 for Catawba) 11,013
2 6,916 1.5 10,374
Total 10,537 21,387
* Zone 1 extends out 30 feet perpendicular from the top of the near bank of channel; Zone 2 extends an
additional 20 feet from the edge of Zone 1.
3. If buffer mitigation is required, please discuss what type of mitigation is proposed (i.e.,
Donation of Property, Riparian Buffer Restoration / Enhancement, or Payment into the
Riparian Buffer Restoration Fund). Please attach all appropriate information as identified
within 15A NCAC 2B .0242 or .0244, or .0260. Payment to the NC-EEP is proposed to
satisfy the reauired buffer mitigation. S&EC does not believe that the nronosed
nonperpendicular buffer impacts at Impact 6 should require mitigation because the dam is
already being used as a road crossing (i.e. an existing use), however if mitigation is proposed
payment to the NC-EEP is proposed.
XI. Stormwater (required by DWQ)
Describe impervious acreage (existing and proposed) versus total acreage on the site. Discuss
stormwater controls proposed in order to protect surface waters and wetlands downstream from
the property. If percent impervious surface exceeds 20%, please provide calculations
demonstrating total proposed impervious level. The overall impervious surface area is less than
30% therefore a stormwater nlan is not beina submitted for DWO annroval. A more densely
concentrated area exists on the southeastern portion of the property that will exceed 30%
impervious. The stormwater wetland that has been designed to treat this stormwater will meet
DWQ standards. Additionally, stormwater is being treated on site in six additional areas as per
the Town of Apex's requirements.
XII. Sewage Disposal (required by DWQ)
Clearly detail the ultimate treatment methods and disposition (non-discharge or discharge) of
wastewater generated from the proposed project, or available capacity of the subject facility.
The property will tie into existing Town of Apex sewer lines on adjacent properties. _
XIII. Violations (required by DWQ)
Is this site in violation of DWQ Wetland Rules (15A NCAC 2H .0500) or any Buffer Rules?
Yes ? No
Is this an after-the-fact permit application? Yes ? No
Page 8 of 9
XIV. Cumulative Impacts (required by DWQ)
Will this project (based on past and reasonably anticipated future impacts) result in additional
development, which could impact nearby downstream water quality? Yes El No
If yes, please submit a qualitative or quantitative cumulative impact analysis in accordance with
the most recent North Carolina Division of Water Quality policy posted on our website at
http://h2o.enr. state.nc.us/ncwetlands. If no, please provide a short narrative description:
We have reviewed the "DRAFT Internal Policy, Cumulative impacts and the 401 Water Quality
Certification and Isolated Wetland Programs" document prepared by the NC Division of Water
Quality on October 3 2002, version 1.6. The draft states that most residential subdivisions are
unlikely to cause cumulative impacts. Downing Village Subdivision does not meet any of the
three criteria of private projects that can clearly result in cumulative impacts. We anticipate that
you will advise us if a qualitative or quantitative impact analysis is required.
XV. Other Circumstances (Optional):
It is the applicant's responsibility to submit the application sufficiently in advance of desired
construction dates to allow processing time for these permits. However, an applicant may
choose to list constraints associated with construction or sequencing that may impose limits on
work schedules (e.g., draw-down schedules for lakes, dates associated with Endangered and
Threatened Species, accessibility problems, or other issues outside of the applicant's control).
--- October 28, 2005
Applicant/Agent's Signature Date
(Agent's signature is valid only if an authorization letter from the applicant is provided.)
Page 9 of 9
Soil & Environmental Consultants, PA
11010 Raven Ridge Road • Raleigh, North Carolina • Phone: [phone] • Fax: [phone]
www.SandEC.com
AGENT AUTHORIZATION FORM
All Blanks To Be Filled In By The Current Landowner
Name: 5 7- Jc 1 a ?-?- f-,
Address:
l 2 721-
Phone: Kf 9" 6 S-,&
C
Project Name/ Description: 'S' -e a -.1 J15- .•..V, S&EC Project # W 2
Date: °t - L - VS?
The Department of the Army
U.S. Army Corps of Engineers, Wilmington District
P.O. Box 1890
Wilmington, NC 28402
Attn: A /Meos
Field Office: R, le, L`
Re: Wetlands Related Consulting and Permitting
To Whom It May Concern:
I, the current ro er owner, hereby designate and authorize Soil & Environmental Consultants, PA to act in my
behalf as my agent in the processing of permit applications, to furnish upon request supplemental information in
support of applications, etc. from this day forward. The day of
This notification supersedes any previous correspondence concerning the agent for this project.
NOTICE. This authorization, for liability and professional courtesy reasons, is valid only for government
officials to enter the property when accompanied by S&EC staff. You should call S&EC to arrange a site
meetin prior to visiting the site. `
Print Pr er wner's Name Property Owner's Signature
cc: Ms. Cyndi Karoly
NCDENR - DWQ
2321 Crabtree Boulevard
Raleigh, NC 27604
Charlotte Office:
236 LcPhillip Ct. Suite C
Concord, NC 28025
cc: Mr. Sean Clark
Soil & Environmental Consultants, PA
Greensboro Office
3817-E Lawndale Drive
Greensboro, NC 27455
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Figure 2 - Soil Survey Soil & Environmental Consultants, PA
11010 Raven Ridge Rd.- Raleigh, NC 27614
[phone] - [phone]
Web Page: www.SandEC.com
Picture 1: Streambed within the area of proposed Impact 13 (see application)

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LEGEND
® = BUFFER IMPACT - ZONE I
= BUFFER IMPACT - ZONE 2
= 5EWER CROSSING
= STREAM E (,ETLAND IMPACTS
= WETLAND ( TYP)
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NO. SHEET P UW05E VETLANDS
S0. FT. CHANNEL
sa FT. / LI NEAR FT.
I STORM SEWER JURISDICTIONAL 0 0 0
2 1 STORM SEVER JURISDICTIONAL 0 0 0
3 2 STCWIb1TER DEVICE JURI5DICTION& 951 0 0
4 2 ROAD CROSSING JURISDICTIONAL 301 0 0
6 3 ROAD CROSSING JURISDICTIONAL 0 918 91 PERPINDICULAR
PARN..LE-
7 4 STORM SEVER JURISDICTICNAL 0 0 0
8 4 STORM SEVER JURI5DICTICNAI 0 0 0
9 4 SANITARY 5EHER JURISDICTIONAL 0 470 40
10 4 STORM SEVER JURISDICTIONAL 0 0 0
II 4 ROAD CR0551NG JURISDICTIONAL. 452 0 0
12 4 SANITARY SEVER JURISDICTIONAL 0 195 40
13 4/5 ROHD CRO551NG JURISDICTIO& 0 639 146
TOTALS, 1,710 2,222 317
NEUSE BUFFER
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ZONE I ZONE 2 TOT&

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50. FT.
S0. FT.

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7.241 0
4,755 0
12, 032 / ------
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3,671 6,916 10,537 j
623 430 1,053 j j /
601 400 1.001

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3, 137 1.752 4,889 J
b45 454 1,099

2,714 1,102 3,816
7,929 4,050 11,979
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A SINGLE FAMILY AND TC4NHQ15E SUBDIVISION
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Soil & Environ mental Consultants, PA
11010 Raven Ridge Road • Raleigh, Nor th Carolina 27614 • Phone: [phone] • Fax: [phone]
www.SandEC.com
October 28, 2005
S&EC Project # 7416.w1
To: US Army Corps of Engineers N.C. Division of Water Quality
Raleigh Regulatory Field Office 401 Oversight and Express Permits Unit
Attn: Monte Matthews Attn: Cyndi Karoly
6508 Falls of the Neuse Road 2321 Crabtree Boulevard
Suite 120 Suite 250
Raleigh, NC 27615 Raleigh, NC 2760-4-2260
? ? ???
R D
From: Sean Clark
Soil & Environmental Consultants, P.A.
O C 7 2 8 2005
11010 Raven Ridge Road
Raleigh, NC 27614
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Re:
Seagrove's Farm ttikTl
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Apex, NC
On behalf of the owner, Westfield Homes of the Carolinas, LLC, please find attached a complete
application and supplemental information requesting written concurrence from the U.S. Army
Corps of Engineers (USACE) that the activities proposed below may proceed under Nationwide
Permits 12, 18, and 39 and General Water Quality Certifications 3374 and 3402. Please contact
me at [phone] if you have any questions or require additional information. In addition,
please consider this application our request for a no practical alternatives determination and
Authorization Certificate for impacts to riparian buffers protected under the Neuse Buffer Rule.
PROJECT SUMMARY
Project Name Sea grove's Farm
Project Type Residential Subdivision
Owner / Applicant Westfield Homes of the Carolinas
Count Wake
Nearest Town Apex
Water Body Name UT to Williams Creek
Basin / Sub-basin Neuse 03-04-02
Index Number 27-43-2
Class WS-III, NSW
IMPACT SUMMARY
Stream Impact (acres): 0.05101 ac
Wetland Impact acres : 0.03926 ac
Open Water Impact (acres): 0.0 ac
Total Impact to Waters of the U.S. (acres) 0.09027 ac
Total Stream Impact (linear feet): 317 LF*
Total Impact to Buffers 48,425 ft
Attachments:
• Pre-construction Notification (PCN) Application
• Agent Authorization
• USGS Map
• Wake County Soil Survey Map
• Pictures of Impact 13 location
• Overall Map
• Impact Maps
Charlotte Office:
236 LePhillip Court, Suite C
Concord, NC 28025
Phone: [phone]
Fax: [phone]
Greensboro Office:
3817-E Lawndale Drive
Greensboro, NC 27455
Phone: [phone]
Fax: [phone]
Office Use Only: Form Vcrsion March 05
USACE Action ID No. DWQ No.
(If any particular item is not applicable to this project, please enter "Not Applicable" or "N/A".)
1. Processing
1. Check all of the approval(s) requested for this project:
® Section 404 Permit ® Riparian or Watershed Buffer Rules
? Section 10 Permit ? Isolated Wetland Permit from DWQ
® 401 Water Quality Certification ? Express 401 Water Quality Certification
2. Nationwide, Regional or General Permit Number(s) Requested: NWP 12, 18, and 39
3. If this notification is solely a courtesy copy because written approval for the 401 Certification
is not required, check here: ?
4. If payment into the North Carolina Ecosystem Enhancement Program (NCEEP) is proposed
for mitigation of impacts, attach the acceptance letter from NCEEP, complete section VIII,
and check here: ?
5. If your project is located in any of North Carolina's twenty coastal counties (listed on page
4), and the project is within a North Carolina Division of Coast ana ement Area of
Environmental Concern (see the top of page 2 for further details), cha lonwi n
II. Applicant Information d C T 2 A 2005
DGNfd - Y?gTkii gUAL?7Y
1. Owner/Applicant Information ?;?1?,??yAr?a.ST?y!,?t??r??trip??
Name: Westfield Homes of the Carolinas, LLC
Mailing Address: Attn: David Goracke
4112 Pleasant Valley Road
Raleigh, NC 27612
Telephone Number: 919-868-6567 Fax Number: 919-789-9200
E-mail Address: dgorackePstanpac.com
2. Agent/Consultant Information (A signed and dated copy of the Agent Authorization letter
must be attached if the Agent has signatory authority for the owner/applicant.)
Name: Sean Clark
Company Affiliation: Soil & Environmental Consultants, PA
Mailing Address: 11010 Raven Ridge Road
Raleigh, NC 27614
Telephone Number: 919-846-5900 Fax Number: 919-846-9467
E-mail Address: sclarkna sandee.com
Page 1 of 9
III. Project Information
Attach a vicinity map clearly showing the location of the property with respect to local
landmarks such as towns, rivers, and roads. Also provide a detailed site plan showing property
boundaries and development plans in relation to surrounding properties. Both the vicinity map
and site plan must include a scale and north arrow. The specific footprints of all buildings,
impervious surfaces, or other facilities must be included. If possible, the maps and plans should
include the appropriate USGS Topographic Quad Map and NRCS Soil Survey with the property
boundaries outlined. Plan drawings, or other maps may be included at the applicant's discretion,
so long as the property is clearly defined. For administrative and distribution purposes, the
USACE requires information to be submitted on sheets no larger than 11 by 17-inch format;
however, DWQ may accept paperwork of any size. DWQ prefers full-size construction
drawings rather than a sequential sheet version of the full-size plans. If full-size plans are
reduced to a small scale such that the final version is illegible, the applicant will be informed that
the project has been placed on hold until decipherable maps are provided.
1. Name of project: Seagrove's Farms Subdivision
2. T.I.P. Project Number or State Project Number (NCDOT Only): N/A
3. Property Identification Number (Tax PIN): 0752009681
4. Location
County: Wake County Nearest Town: Apex
Subdivision name (include phase/lot number): Sea grove's Farm
Directions to site (include road numbers/names, landmarks, etc.): The project site is located
immediately north of Center Street (SR 1010) at a point approximately 700 feet west of the
intersection of Highway 1 and Center Street in Apex, NC.
5. Site coordinates (For linear projects, such as a road or utility line, attach a sheet that
separately lists the coordinates for each crossing of a distinct waterbody.)
Decimal Degrees (6 digits minimum): 35.7285 ON 78.8283 °W
6. Property size (acres): +/- 68 acres
7. Name of nearest receiving body of water: UT to Williams Creek
8. River Basin: Neuse River Basin
(Note - this must be one of North Carolina's seventeen designated major river basins. The
River Basin map is available at http://h2o.enr.state.nc.us/admin/maps/.)
9. Describe the existing conditions on the site and general land use in the vicinity of the project
at the time of this application: The majority of the site is a pasture that has not been tended
in approximately 2 years. The surrounding properties are primarily single-family residential
subdivisions.
Page 2 of 9
10. Describe the overall project in detail, including the type of equipment to be used: The
proposed project will be a residential subdivision. The majority of the site will be single
family free standing homes however a portion of the property will be town home type
structures. Also an approximately 10-acre portion of the property will be a town park
(passive use with no pools, buildings, etc.). Heavy equipment typically used for road
construction and grading will be utilized on this project.
11. Explain the purpose of the proposed work:_ _ The proposed project will provide additional
housing for the area to meet demand. Proposed impacts will result primarily from road and
other utility crossings required to properly service and access the project.
IV. Prior Project History
If jurisdictional determinations and/or permits have been requested and/or obtained for this
project (including all prior phases of the same subdivision) in the past, please explain. Include
the USACE Action ID Number, DWQ Project Number, application date, and date permits and
certifications were issued or withdrawn. Provide photocopies of previously issued permits,
certifications or other useful information. Describe previously approved wetland, stream and
buffer impacts, along with associated mitigation (where applicable). If this is a NCDOT project,
list and describe permits issued for prior segments of the same T.I.P. project, along with
construction schedules. DWQ conducted a field meeting on November 20, 2002 to determine
the extents of the buffers (NBRRO # 03-034). S&EC delineated the jurisdictional features on the
property in 2003. The delineation was approved by the USACE on April 19, 2004 (Action ID #
200420787. No previous permits have been requested or issued for the site. Pictures of the
drainage being crossed at Impact 13 are attached to this submittal.
V. Future Project Plans
Are any future permit requests anticipated for this project?. If so, describe the anticipated work,
and provide justification for the exclusion of this work from the current application.
No future permits are expected to be required at this time.
VI. Proposed Impacts to Waters of the United States/Waters of the State
It is the applicant's (or agent's) responsibility to determine, delineate and map all impacts to
wetlands, open water, and stream channels associated with the project. Each impact must be
listed separately in the tables below (e.g., culvert installation should be listed separately from
riprap dissipater pads). Be sure to indicate if an impact is temporary. All proposed impacts,
permanent and temporary, must be listed, and must be labeled and clearly identifiable on an
accompanying site plan. All wetlands and waters, and all streams (intermittent and perennial)
should be shown on a delineation map, whether or not impacts are proposed to these systems.
Wetland and stream evaluation and delineation forms should be included as appropriate.
Photographs may be included at the applicant's discretion. If this proposed impact is strictly for
wetland or stream mitigation, list and describe the impact in Section VIII below. If additional
space is needed for listing or description, please attach a separate sheet.
Page 3 of 9
1. Provide a written description of the proposed impacts: Proposed impacts result primarily
from road and utility crossings. A stormwater pond is proposed and will impact 957 ft2 of
jurisdictional wetland.
2. Individually list wetland impacts. Types of impacts include, but are not limited to
mechanized clearing, grading, fill, excavation, flooding, ditching/drainage, etc.. For dams,
separately list impacts due to both structure and flooding.
Wetland Impact Type of Wetland Located within Distance to Area of
Site Number Type of Impact (e.g., forested, marsh, 100-year
Floodplain Nearest
Stream Impact
(acres)
(indicate on map) herbaceous, bog, etc.) es/no linear feet
Impact 3 Permanent Headwater wetland No +/- 500' 0.02197
(NWP 18) Flooding/Fill (herbaceous)
Impact 4 Permanent Headwater wetland N.o +/- 550" 0.00691
(NWP 39) Road Fill (herbaceous)
Impact 11 Permanent Headwater wetland No +/_1001 0.01038
(NWP 39) Road Fill (herbaceous)
Total Wetland Impact (acres) 0.03926
3. List the total acreage (estimated) of all existing wetlands on the property: +/- 0.5 acres
4. Individually list all intermittent and perennial stream impacts. Be sure to identify temporary
impacts. Stream impacts include, but are not limited to placement of fill or culverts, dam
construction, flooding, relocation, stabilization activities (e.g., cement walls, rip-rap, crib
walls, gabions, etc.), excavation, ditching/straightening, etc. If stream relocation is proposed,
plans and profiles showing the linear footprint for both the original and relocated streams
must be included. To calculate acreage, multiply length X width, then divide by 43,560.
Stream Impact Perennial or Average Impact Area of
Number Stream Name Type of Impact Intermittent? Stream Width Length Impact
indicate on ma Before Impact linear feet acres
Impact 6 UT to Williams Permanent Perennial +/-10' 91 LF 0.02107
(NWP 39) Creek Road Fill/ culvert
Impact 9 UT to Williams Temporary Perennial 40 LF 0
01079
(NWP 12) Creek Excavation .
Impact 12 UT to Williams Temporary Intermittent +/-41 40 LF 0.00448
(NWP 12) Creek Excavation
Impact 13 UT to Williams Permanent Intermittent
' 146 LF 0.01467
(NWP 39) Creek Road Fill/ culvert +/- 4
Total Stream Impact (by length and acreage) 317 LF 0.05101
5. Individually list all open water impacts (including lakes, ponds, estuaries, sounds, Atlantic
Ocean and any other water of the U.S.). Open water impacts include, but are not limited to
fill, excavation, dredging, flooding, drainage, bulkheads, etc.
Open Water Impact Name of Waterbody Type of Waterbody Area of
Site Number (if applicable) Type of Impact (lake, pond, estuary, sound, bay, Impact
indicate on ma ocean, etc. acres
N/A N/A N/A N/A N/A
Total Open Water Impact (acres) N/A
Page 4 of 9
6. List the cumulative impact to all Waters of the U.S. resulting from the project:
Stream Im act acres : 0.05101
Wetland Impact (acres): 0.03926
Open Water Impact acres : 0
Total Impact to Waters of the U.S. acres 0.09027
Total Stream Impact linear feet : 317 LF
7. Isolated Waters
Do any isolated waters exist on the property? ? Yes ® No
Describe all impacts to isolated waters, and include the type of water (wetland or stream) and
the size of the proposed impact (acres or linear feet). Please note that this section only
applies to waters that have specifically been determined to be isolated by the USACE.
There are no isolated wetlands/streams on the property.
8. Pond Creation
If construction of a pond is proposed, associated wetland and stream impacts should be
included above in the wetland and stream impact sections. Also, the proposed pond should
be described here and illustrated on any maps included with this application.
Pond to be created in (check all that apply): ? uplands ? stream ? wetlands
Describe the method of construction (e.g., dam/embankment, excavation, installation of
draw-down valve or spillway, etc.): N/A
Proposed use or purpose of pond (e.g., livestock watering, irrigation, aesthetic, trout pond,
local stormwater requirement, etc.): N/A
Current land use in the vicinity of the pond: N/A
Size of watershed draining to pond: N/A Expected pond surface area: N/A
VII. Impact Justification (Avoidance and Minimization)
Specifically describe measures taken to avoid the proposed impacts. It may be useful to provide
information related to site constraints such as topography, building ordinances, accessibility, and
financial viability of the project. The applicant may attach drawings of alternative, lower-impact
site layouts, and explain why these design options were not feasible. Also discuss how impacts
were minimized once the desired site plan was developed. If applicable, discuss construction
techniques to be followed during construction to reduce impacts. Proposed impacts have been
minimized by using nemendicular road crossings, retainina walls and avoiding general lot fill.
The pond on site is contained within an area that will be a passive use Town of Apex Park. The
proposed road crossing immediately below the existing dam is required in order to gain access to
the northern portion of the property. The road crossing connecting the project to the adjacent
subdivision to the east is required by the Town of Apex for interconnectivity purposes and will
tie into a fixed road stub.
VIII. Mitigation
DWQ - In accordance with 15A NCAC 2H .0500, mitigation may be required by the NC
Division of Water Quality for projects involving greater than or equal to one acre of impacts to
Page 5 of 9
freshwater wetlands or greater than or equal to 150 linear feet of total impacts to perennial
streams.
USACE - In accordance with the Final Notice of Issuance and Modification of Nationwide
Permits, published in the Federal Register on January 15, 2002, mitigation will be required when
necessary to ensure that adverse effects to the aquatic environment are minimal. Factors
including size and type of proposed impact and function and relative value of the impacted
aquatic resource will be considered in determining acceptability of appropriate and practicable
mitigation as proposed. Examples of mitigation that may be appropriate and practicable include,
but are not limited to: reducing the size of the project; establishing and maintaining wetland
and/or upland vegetated buffers to protect open waters such as streams; and replacing losses of
aquatic resource functions and values by creating, restoring, enhancing, or preserving similar
functions and values, preferable in the same watershed.
If mitigation is required for this project, a copy of the mitigation plan must be attached in order
for USACE or DWQ to consider the application complete for processing. Any application
lacking a required mitigation plan or NCEEP concurrence shall be placed on hold as incomplete.
An applicant may also choose to review the current guidelines for stream restoration in DWQ's
Draft Technical Guide for Stream Work in North Carolina, available at
http://h2o.enr.state.nc.us/newetlands/strmgide.html.
1. Provide a brief description of the proposed mitigation plan. The description should provide
as much information as possible, including, but not limited to: site location (attach directions
and/or map, if offsite), affected stream and river basin, type and amount (acreage/linear feet)
of mitigation proposed (restoration, enhancement, creation, or preservation), a plan view,
preservation mechanism (e.g., deed restrictions, conservation easement, etc.), and a
description of the current site conditions and proposed method of construction. Please attach
a separate sheet if more space is needed.
Payment to the NC-EEP is proposed for the proposed permanent impacts to the perennial
stream channel on the property.
2. Mitigation may also be made by payment into the North Carolina Ecosystem Enhancement
Program (NCEEP). Please note it is the applicant's responsibility to contact the NCEEP at
[phone] to determine availability, and written approval from the NCEEP indicating
that they are will to accept payment for the mitigation must be attached to this form. For
additional information regarding the application process for the NCEEP, check the NCEEP
website at http://h2o.enr.state.nc.us/wrp/index.htm. If use of the NCEEP is proposed, please
check the appropriate box on page five and provide the following information:
Amount of stream mitigation requested (linear feet): 91 LF
Amount of buffer mitigation requested (square feet): 8.142 ft2
Amount of Riparian wetland mitigation requested (acres): 0
Amount of Non-riparian wetland mitigation requested (acres): 0
Amount of Coastal wetland mitigation requested (acres): 0
Page 6 of 9
IX. Environmental Documentation (required by DWQ)
1. Does the project involve an expenditure of public (federal/state/local) funds or the use of
public (federal/state) land? Yes ? No
2. If yes, does the project require preparation of an environmental document pursuant to the
requirements of the National or North Carolina Environmental Policy Act (NEPA/SEPA)?
Note: If you are not sure whether a NEPA/SEPA document is required, call the SEPA
coordinator at [phone] to review current thresholds for environmental documentation.
Yes ? No ?
3. If yes, has the document review been finalized by the State Clearinghouse? If so, please
attach a copy of the NEPA or SEPA final approval letter. Yes ? No ?
X. Proposed Impacts on Riparian and Watershed Buffers (required by DWQ)
It is the applicant's (or agent's) responsibility to determine, delineate and map all impacts to
required state and local buffers associated with the project. The applicant must also provide
justification for these impacts in Section VII above. All proposed impacts must be listed herein,
and must be clearly identifiable on the accompanying site plan. All buffers must be shown on a
map, whether or not impacts are proposed to the buffers. Correspondence from the DWQ
Regional Office may be included as appropriate. Photographs may also be included at the
applicant's discretion.
1. Will the project impact protected riparian buffers identified within 15A NCAC 2B .0233
(Neuse), 15A NCAC 2B .0259 (Tar-Pamlico), 15A NCAC 02B .0243 (Catawba) 15A NCAC
2B .0250 (Randleman Rules and Water Supply Buffer Requirements), or other (please
identify V Yes ® No ?
2. If "yes", identify the square feet and acreage of impact to each zone of the riparian buffers.
If buffer mitigation is required calculate the required amount of mitigation by applying the
buffer multipliers.
Perpendicular Impacts Not Requiring Mitigation
Zone* I Impact I Multiplier 1 Required
i .. r o.? r:.. .:
1 9,886 3 (2 for Catawba) 0
2 12,681 1.5 0
Total 22,567 0
Impact 12 (Nonperpendicular Utility Crossinji)
Zone* Impact
(square feet Multiplier Required
Miti ation
1 2,714 3 (2 for Catawba) 8,142
2 1,102 1.5 0
Total 3,816 8,142
Page 7 of 9
Impact 6 on er endicular Portion of Road Crossing)
Zone* Impact
(square feet Multiplier Required
Mitigation
1 3,671 3 (2 for Catawba) 11,013
2 6,916 1.5 10,374
Total 10,537 21,387
* Zone 1 extends out 30 feet perpendicular from the top of the near bank of channel; Zone 2 extends an
additional 20 feet from the edge of Zone 1.
3. If buffer mitigation is required, please discuss what type of mitigation is proposed (i.e.,
Donation of Property, Riparian Buffer Restoration / Enhancement, or Payment into the
Riparian Buffer Restoration Fund). Please attach all appropriate information as identified
within 15A NCAC 2B .0242 or .0244, or .0260. Payment to the NC-EEP is proposed to
satisfy the reouired buffer mitigation. S&EC does not believe that the nronosed
nonperpendicular buffer impacts at Impact 6 should require mitigation because the dam is
already being used as a road crossing_(i.e. an existing use), however if mitigation is proposed
payment to the NC-EEP is proposed.
XI. Stormwater (required by DWQ)
Describe impervious acreage (existing and proposed) versus total acreage on the site. Discuss
stormwater controls proposed in order to protect surface waters and wetlands downstream from
the property. If percent impervious surface exceeds 20%, please provide calculations
demonstrating total proposed impervious level. The overall impervious surface area is less than
30% therefore a stormwater elan is not being submitted for DWO anoroval. A more densely
concentrated area exists on the southeastern portion of the property that will exceed 30%
impervious. The Stormwater wetland that has been designed to treat this stormwater will meet
DWQ standards. Additionally, stormwater is being treated on site in six additional areas as per
the Town of Apex's requirements.
XII. Sewage Disposal (required by DWQ)
Clearly detail the ultimate treatment methods and disposition (non-discharge or discharge) of
wastewater generated from the proposed project, or available capacity of the subject facility.
The property will tie into existing Town of Apex sewer lines on adjacent properties.
XIII. Violations (required by DWQ)
Is this site in violation of DWQ Wetland Rules (15A NCAC 2H .0500) or any Buffer Rules?
Yes ? No
Is this an after-the-fact permit application? Yes ? No
Page 8 of 9
XIV. Cumulative Impacts (required by DWQ)
Will this project (based on past and reasonably anticipated future impacts) result in additional
No
development, which could impact nearby downstream water quality? Yes El
If yes, please submit a qualitative or quantitative cumulative impact analysis in accordance with
the most recent North Carolina Division of Water Quality policy posted on our website at
http://h2o.enr.state.nc.us/ncwet]ands. If no, please provide a short narrative description:
We have reviewed the "DRAFT Internal Policy, Cumulative impacts and the 401 Water Quality
Certification and Isolated Wetland Programs" document prepared by the NC Division of Water
Quality on October 3, 2002, version 1.6. The draft states that most residential subdivisions arc
unlikely to cause cumulative impacts. Downing Village Subdivision does not meet any of the
three criteria of private projects that can clearly result in cumulative impacts. We anticipate that
you will advise us if a qualitative or quantitative impact analysis is required.
XV. Other Circumstances (Optional):
It is the applicant's responsibility to submit the application sufficiently in advance of desired
construction dates to allow processing time for these permits. However, an applicant may
choose to list constraints associated with construction or sequencing that may impose limits on
work schedules (e.g., draw-down schedules for lakes, dates associated with Endangered and
Threatened Species, accessibility problems, or other issues outside of the applicant's control).
Applicant/Agent's Signature Date
(Agent's signature is valid only if an authorization letter from the applicant is provided.)
Page 9 of 9
Soil & Environmental Consultants, PA
11010 Raven Ridge Road • Raleigh, North Carolina • Phone: [phone] • Fax: [phone]
www.SandEC.com
AGENT AUTHORIZATION FORM
All Blanks To Be Filled In By The Current Landowner
Name: - _ S 7'
Address:
?? Z7 ? Z,
Phone: .sl^
Project Name/ Description: S z-'A 1) ..r a -0 S&EC Project #
Date: 01 - 13 - y?
The Department of the Army
U.S. Army Corps of Engineers, Wilmington District
P.O. Box 1890
Wilmington, NC 28402
Attn: X ,f k ^ A -,Js
Field Office: tin le, S
Re: Wetlands Related Consulting and Permitting
To Whom It May Concern:
I, the current proper owner, hereby designate and authorize Soil & Environmental Consultants, PA to act in my
behalf as my agent in the processing of permit applications, to furnish upon request supplemental information in
support of applications, etc. from this day forward. The day of
This notification supersedes any previous correspondence concerning the agent for this project.
NOTICE. This authorization, for liability and professional courtesy reasons, is valid only for government
officials to enter the property when accompanied by S&EC staff. You should call S&EC to arrange a site
meetin prior to visiting the site. `
Acv ? 4
Print Pr er wner's Name Property Owner's Signature
cc: Ms. Cyndi Karoly
NCDENR - DWQ
2321 Crabtree Boulevard
Raleigh, NC 27604
Charlotte Office:
236 LcPhillip Ct. Suite C
Concord, NC 28025
cc: Mr. Sean Clark
Soil & Environmental Consultants, PA
Greensboro Office
3817-E Lawndale Drive
Greensboro, NC 27455
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APEX, N. C.
35078-F7-TF-024
PHOTOINSPECTED 1988
1974
PHOTOREVISED 1987
DMA 5255 111 NE-SERIES V842
Soil & Environmental Consultants, PA
11010 Raven Ridge Rd.- Raleigh, NC 27614
[phone] • [phone]
Web Page: www.SandEC.com
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Figure 2 - Soil Survey v Soil & Environmental Consultants, PA
11010 Raven Ridge Rd.- Raleigh, NC 27614
[phone] • [phone]
Web Page: www.SandEC.com
Picture 1: Streambed within the area of proposed Impact 13 (see application)

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® = BUFFER IMPACT - ZONE I
= BUFFER IMPACT - ZONE 2
SEWER CROSSING
= STREAM E WETLAND IMPACTS
(- ee WETLAND ( TYP)
IWP LT SHEET PURPOSE
No.
F? CHN 04EL
S0. FT. SO. FT. / LINEAR FT

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I I STORM S58Z JURI 5DI CT I ON& 0 0 0
2 I STORM 5B-ER JURISDICTIONAL 0 0 0
3 2 STORM RATER DEVICE JURISDICTIOAL 957 0 0
4 2 ROAD CROSSING JURISDICTIONAL 301 0 0
6 3 ROAD CROSSING JURI5DICTION& 0 918 91 PEZPINDICJJLAR
PNRALLEL
7 4 STORM 55-ER JURISDICTIONAL 0 0 0
6 4 STORM 58458 JURISDICTIONAL 0 0 0
9 4 SANITARY 56-ER JURI5DICTIONNI 0 470 40
10 4 STORM SBER JUR1501CTIO& 0 0 0
II 4 ROAD CROSSING JURISDICTIONAL 452 0 0
12 4 SANITARY 554 JURISDICTIONAL 0 195 40
13 4/5 RW CROSSING JURISDICTIO& 0 639 14b
TOTALS 1,710 2,222 317

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Soil & Environmental Consultants, PA
11010 Raven Ridge Road • Raleigh, North Carolina 27614 • Phone: [phone] • Fax: [phone]
www.SandEC.com
Transmittal
To: DUDO
Project #: Date: 12 1? 0??
c
Otn M S • 0Ai Va. I Project Name:
?39,I Crab tc ?l??c_a. 'Sig 2
c File:
.kj
We Transmit to you Herewith:
a Drawings Q' For your information and files
Ed' Specifications ? For comment or approval
? Brochures or photos ? Returned for correction, resubmit
Correspondence ? Approved as noted
Asper your request
Under-Separate-Cover=
? By mail
Q' By courier
? By express
No. Copies Document No. Date Description

17-05 ja- Cj,- L71,(.1 ?'S 1Z 5 U ?r

Remarks:
If enclosures are not as listed as above, kindly notify us at once.
DEC 1 1, 2005
By' Dt:M-'WAILl? CdVn;_I?r
Chaflotte Office:
236 LePhillip Court, Suite C
Concord, NC 28025
Phone: [phone]
Fax: [phone]
Greensboro Office:
3817-E Lawndale Drive
Greensboro, NC 27455
Phone:; [phone]
Fax: [phone]
° Soil & Environmental Consultants, PA
11010 Raven Ridge Road - Raleigh, North Carolina 27614 - Phone: [phone] - Fax: [phone]
www.SandEC.com
December 12, 2005
S&EC Project #7416.W 1
DWQ Project #05-1985
Department of Environment and Natural Resources
Division of Water Quality
Attn: Cyndi Karoly
2321 Crabtree Boulevard
Suite 250
Raleigh, NC 27604
UEC ??. ?OU")
CEP°?< , - '1CH
v;uuv LS wiD STGi? : ` ,? Eii iu
Re: Reply to the Division of Water Quality's Request for the Seagrove's Farm 401
application, Wake County, NC
Dear Ms. Karoly:
The purpose of this letter is to respond to your December 5, 2005 letter requesting further
information. The original questions/requests are copied below as they appear on the
12/05/05 letter and are then followed by our response to each.
Additionallnformation Requested:
1. Please provide diffuse flow provision measures (level spreaders along with
worksheets showing how they were designed) and show them on the site plans.
Although the proposed project is within the Neuse River Basin, and the project as a whole
is less than 30% impervious, the applicant is proposing six (6) extended detention
wetlands throughout the proposed project for the Town of Apex. These extended
detention wetlands are designed as per the NC Department of Environment and Natural
Resources, Division of Water Quality, Stormwater Best Management Practices (April
1999) design guidelines. As per and 15A NCAC 02B .0233, stormwater outfalls that are
constructed within the riparian buffer is an "allowable" use provided that a stormwater
management facilities are installed to control nitrogen and attenuate flow. In addition,
according to the NC Division of Water Qualities "Draft Level Spreader Design Options,
Version 1.0" (October 10, 2001), direct discharge of stormwater through the riparian
buffers is also considered an "allowable" use when best management practices are used to
remove the nutrients and/or pollutants in question, this "allowable" use requires written
approval from the Division of Water Quality. Therefore, our client is requesting written
approval from the Division of Water Quality to construct these storm water outfalls within
the riparian buffer and directly discharge the stormwater to the stream.
Charlotte Office:
236 LcPhillip Court, Suite C
Concord, NC 28025
Phone: [phone]
Fax: [phone]
Greensboro Office:
3817-E llawndale Drive
Greensboro, NC 27455
Phone: [phone]
Fax: [phone]
2. Please provide separate impact maps for each individual buffer impact, as is
typical of applications submitted by your company. These separate drawings
were not provided for this particular application, and ire find them very
helpful in interpreting your project plans.
Attached are sheets 1 through 5 which include separate impact maps at a 1" = 50' scale
for each individual buffer impact, stream impact and wetland impacts.
Please call if you have any questions or require further explanation.
Sincerely,
Scan Clark
Project Manager/Environmental Scientist
Sincerely,
4
Deborah Edwards
Environmental Specialist
Attachments:
1) Revised impact maps, sheets 1-5
2) Extended detention wetland worksheets, ponds #1, 4, 5, 6, 8 and 10
3) Extended detention wetland plan & profile, ponds #1, 4, 5, 6, 8 and 10
2
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= WETLAND ( TYP)
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2 1 STORM SEWER JURISDICTIONAL 0 0 0
3 2 5TC4 WTER DEVICE JURISDICTIONAL 957 0 0
4 2 ROAD CROSSING JURISDICTIONAL 301 0 0
6 3 ROAD CRO551NG JURISDICTIONAL 0 918 91 PERPINDIOJLAR
PARALLEL
7 4 5T" S&ER JURISDICTIONAL 0 0 0
9 4 5ANITART SEWER JURISDICTIONAL 0 360 30
10 4 STORM SEER JURISDICTIONAL 0 0 0
11 4 ROAD CR055ING JUR15DICTICNAL 452 0 0
12 4 SANITMT SEWER JURISDICTIONAL 0 195 40
13 4/5 ROAD 0R0551 No JURISDICTIONAL 0 639 146
TOTALS 1,710 2,112 307

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SE, 5GROVEI S F,104 SALE I WETLAND IMPACT MAP PRIEST CRAVEN & ASSOCIATES,INC.
A SINCE FAMILY AND TONHa15E UEDIYISIa4 DATE JULY 25. 2005
WLt41E CHRITFPLE TRUST APEX NORTH CJR0.INA PROJECT: 200]-024. 1 LAND USE CONSULTANTS PLINN'ERS/LANDSCAPE DESIGNERS /SURVEYORS/ENGLNTEERS
3803 - B Computes Drive, Suite 104 Raleigh, N.C. 37609. Ph-c 91917814700. Fu 9191787.1188. Fmui1 P-tCmvtay=n oso
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SCALE I =50-
IMPACT 43
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FALand Projects\MacGregor Development12002-024.001 MacGregor- Seagrove -Apex\Dwg\Wedands\BF-Wetlands-Sheets 1-5.dwg, 12/9/2005 12:26:46 PM
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0+ 00 1+ 00 2+ 00 3+ 00
DWO Projoct
DMSION OF WATER OUALRY - 401 EXTENDED DETENTION (and POCKET-) WETLAND WORKSHEET
L PROJECT INFORMATION (pleas complete the blowing iniormation):
ProjedName: Seagrove's Farms
Contact Person: Dan Bu rut Ph" Number. (919) ,7 8 1,- 0 0
For projects with murlb* basins, specify wtmdn basin this workshoot applies to: -Pond #1
Permanent Pod Elevation 410.00 ft. (elevation of to orifroe invert out)
Temporary Pod Elevab r 411.50 fL (elevation of the Outiet strmxcuuo invert in)
Permanent Pod Surface Area 9800 94 ft. (water Surface area at pernw"t pod aiw tion)
Drainage Area 10.72 W. (an-site arid oUb drainage to the basin)
Impervious Area 4.69 ac. (on-side and Otk to drainage to Om basin)
Forebay Surface Area 1470 sq. R (at permanent pod dwatien approximately 15%)'
Marsh 0--9- Surface Area 3430 sq. ft (tt permanert pool elevation WcAmately 35%)*
Marsh 9'-18' Surface Area 3430 sq. R (at permanent pool elevation approxYnately 35%)*
Micro Pool Surface Area 1470 sq. ft (at pemmanent pool elevation approxi naf0ly 15%)'
Temporary Pool Volume 16,088 Cu. ft (volume detained on top of the permanent pool)
SMA used 1.86 (surface aroa b drainage area ratio).
Diarnater of Orifice 2 in. (draw down orifice diameter)
U. REQUIRED ITEMS CHECKLIST
Initial in the apace pr aw" to indcmte the 16110mg design requirements have boon met and supporting documentation is attached. !f a
roquiremed has not been mot aMxh an a0votion of Miry. At a minimum, a complete M omrwaler management plan a br itlal includes
a varkaheet for each UP, design caia"d=, pima and a vdkations dxNxV ON BMPS and outlet Structure details, a detailed
drainage plan and a rutty executed operation and maintenance agreement. An incanplets subr ltd package will result in a request for
additional inbmmation and will subsbntiiy delay finer review and approval of the project
Applicants Initiih
DJ$• The temporary pod controls runoff from the 1 inch ran.
DJB- The basin aide slopes are no Steeper than 3:1.
'D-TB A planting plan for the marsh areas with plant Species and densities is provided.
D6m, Vegetation above the permanent pod elevation i3 SpOdW.
rQTP' M emegamcy drain Is provided b drain the basin.
DJB- The temporary pod draws down in 2 b 5 days.
DJH„w Sedimert storage Is provided in ft permanent pool.
DJB A aodkmet disposal area 13 provided.
n-Z ? Access is provided for maintenance.
11`T . A She speak signed and notarized opmdon and mairrtenamoe agreemart is provided.
DJ2 The drainage area (kxkAg any of ule area) is delineated on a site plan.
plj? Is provided for mar anar 0e.
DJB Plan details for the wetland are provided.
DJB '-Plan dotai3 for the rid and outlet are provided.
DJB A &19 specific Operation and malnl8nance agreormenf. Soled and notariZed by ft respcr amble party rS provided (See
http ftib.ehnr atate.nc .doc).
Pocket Wedads have diffaret design parameters and am only assurned b remove 35% TSS - See pp. 19 and 20 of the NC DENR
Sbrmwder BMP ManuA, April 1999.10% open water. 50% high marsh, 40% low marsh.
WETLAND DETENTION BASIN # 1 OPERATION AND MAINTENANCE AGREEMENT
SEAGROVE'S FARM LOCATED IN THE TOWN OF APEX, NC.
The wetland detention basin system is defined as the wetland detention basin #1 , pretreatment including
forebays.
Maintenance activities shall be performed as follows:
After every significant runoff producing rainfall event and at least monthly:
a. Inspect the wetland detention basin system for sediment accumulation, erosion, trash accumulation,
vegetated cover, and general condition.
b. Check and clear the orifice of any obstructions such that drawdown of the temporary pool occurs within
2 to 5 days as designed.
2. Repair eroded areas immediately, re-seed as necessary to maintain good vegetative cover, mow
vegetative cover to maintain a maximum height of six inches, and remove trash as needed.
3. Inspect and repair the collection system (i.e. catch basins, piping, swales, riprap, etc.) quarterly to
maintain proper functioning.
4. Remove accumulated sediment from the wetland detention basin system semi-annually or when depth is
reduced to 75% of the original design depth (see diagram below). Removed sediment shall be disposed
of in an appropriate manner and shall be handled in a manner that will not adversely impact water quality
(i.e. stockpiling near a wetland detention basin or stream, etc.).
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 407:75 feet in the main pond, the sediment shall be removed.
[For stormwater wetlands: If the elevation of the marsh areas exceed the permanent pool elevation, the
sediment should be removed to design levels. This shall be performed by removing the upper 6 inches of
soil and stockpiling it. Then the marsh area shall be excavated six inches below design elevations.
Afterwards the stockpiled soil should be spread over the marsh surface. The soil should not be stockpiled
for more than two weeks.]
When the permanent pool depth reads 407.75 feet in the forebay [and micro-pool], the sediment shall be
removed.
BASIN DIAGRAM
(fill in the blanks)
Permanent Pool Elevation 410.00
Sediment moval El. 407.7 7 /o
--------------s-- ------Sediment Removal _Elevation_ 40_7_75 ___ 175%-
Bottom E vation 407.001 5% e
FOREBAY
MAIN POND
Pape 1 of?.
5. Remove cattails and other indigenous wetland plants when they cover 50% of the basin surface. These
plants shall be encouraged to grow along the vegetated shelf and forebay berm.
[For wetlands: Wetland planting densities in the marsh areas should be maintained by replanting bare
areas as needed. Wetland plants should be encouraged to grow in the marsh areas.]
6. If the basin must be drained for an emergency or to perform maintenance, the flushing of sediment
through the emergency drain shall be minimized to the maximum extent practical.
7. All components of the wetland detention basin system shall be maintained in good working order.
8. Level spreaders or other structures that provide diffuse flow shall be maintained every six months. All
accumulated sediment and debris shall be removed from the structure, and a level elevation shall be
maintained across the entire flow spreading structure. Any down gradient erosion must be repaired and/or
replanted as necessary.
I acknowledge and agree by my signature below that I am responsible for the performance of the seven
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.
Print name: David Goracke - for Westfield Homes of the Carolinas, LLC
Title: Vice President
Address: 4112 Pleasant Valley Road, Suite 214 Raleigh, North Carolina 27612
Phor
Sign;
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 rO
Coun y of do hereby certify that'/?v??'-/ 'O"_Q?,-e--.
personally appeared before me this day of ,--2CK2 5, and acknowledge the due
execution of the forgoing wet [wetland] detention basin maintenance requirements. Witness my hand and
official seal,
.?T. Nov?rraxu,c
WAKE ODJM
h, STATE OF NOM NORfH CAiiOllliS
WRY"WEAVER
W APPONTMEM EXPIRES M.29, 2907
SEAL
My commission expires 7 -z G
Pape 2 of 2
DWQ PnJod
DMWN OF WATER QUAUTy - 401 EXTENoED DEi
ELATION (VW POCKET') WETLAND WORKSHEET
L PROJECT INFORMATXM n?I?
ProodName: Seagrove l =- Farms b n 0^):
FC"WPerson. Dan Burud
wain Phone MU" bates. Specify which basil thus workshpd Nurrn
applbsb: Pond #4 -
Pom'nanent Pool
Tempora
Po
l El 147.00
ry
o
evation 448. .SO
` }L
Pemtaner>t Pool Suface Area

Draiflage Area 3550 Sq ft.

40rlious Area 4.58
rrC,

Forebay Suface Area 1.86
Marsh V 9' Suface Area 5 2 sq, ft.
Marsh 9 =18' Surface Area 12 2 61 sq. fL

do Pod Surface Area

12 61 n
L
Sy,
IL
542 n IL
Tarr wary Pool Vdwm
G, 543 CU, ft
SAUDA used

Diameter of Odke 1.77
1 in.
0 REQUfRED ITEMS CHECKUST
(ebvadon of fine onion overt out)
(deviation of the outiot atn)rfin invert in)
(water Surface area at pomtmw pool atevatim)
(arse and Oft b drainage b the basin)
(or aft and off-site drainage b ft basin)
(at Pormarwnt p001 elevation approprn*a 15%)'
(at Pmr0wnt Pod deviation aDp 04Matety 35%)'
(at Permanent pool elevation alVDAMatey 35%)•
(at Permanent Pad eiaration appro)*nak y 15%p
(Y01" doWned on fop of the pmmawrd Pool)
(su face area b drainage are ratio).
(draw down orifice diamebx)
Initial b the Specie providedb bdkicab the
its hm bean met and suMatng ? is attached. If a
mot m4,?wnt has not boon o af an e b das?n or w*. Marlagament irxj?
a mu mat for each , design cxnlarfations, At a nrrurrxrm, a canpieb sbmhwabr
drainage plan and a O*B11iiPexecubd operation
and Plau and catlons avmV al BMI% and Okrtiet *ucbxe plan a'* a deWad
addibad lbiormation and wil substantiyy daisy ? agreornmt An aWj0vj of
"Prof submdfal Package wail result ab regr+est for
P!LZ
_ DJB
D T The bTV0rary Pod oontrds nxwff from the 1 inch rain.
DJI3'The basal Side 00 no Per than 3:1.
A *&V Plan for the marsh areas with plant species and densities a
D .. V89"on above the Wrwnelt pool alevation 93 pr d
Voc*d
DJB` An emergerxy drain Is povided b drab the basin.
?p 7?$ :: -ThO bTM" Pool draws down in 2 b 5 days.
n, -%*M>t *rjge is Provided in Ow pemk?nont
-- n,TR - • ASS is disposal area Is provided, fw0i PvAded w
"TR A Sine 81mik Signed and
pJB ??? am &duft any Offslb am) is de?wa 13 auvided'
DJB Ptah detals for the wedar
DJB Plan defais br the bbl and oulat are pwided.
DJB A Ot0 C OPerWon and Maintenance agaarr4nt
Wetlands httpl&b-dnr sta00.nc.ush>c etlar doc). le party is provided (see
8bn welar BW open water. 50% am only amxnDd high b ne 35% TSS -See pp. 19 and 20 of the NC DEAR
Manual, April 1999.1096 high mrsarsh, , 40% low mar marsh.
WETLAND DETENTION BASIN # 4 OPERATION AND MAINTENANCE AGREEMENT
SEAGROVE'S FARM LOCATED IN THE TOWN OF APEX, NC.
The wetland detention basin system is defined as the wetland detention basin #4 , pretreatment including
forebays.
Maintenance activities shall be performed as follows:
1. After every significant runoff producing rainfall event and at least monthly:
a. Inspect the wetland detention basin system for sediment accumulation, erosion, trash accumulation,
vegetated cover, and general condition.
b. Check and clear the orifice of any obstructions such that drawdown of the temporary pool occurs within
2 to 5 days as designed.
2. Repair eroded areas immediately, re-seed as necessary to maintain good vegetative cover, mow
vegetative cover to maintain a maximum height of six inches, and remove trash as needed.
3. Inspect and repair the collection system (i.e. catch basins, piping, swales, riprap, etc.) quarterly to
maintain proper functioning.
4. Remove accumulated sediment from the wetland detention basin system semi-annually or when depth is
reduced to 75% of the original design depth (see diagram below). Removed sediment shall be disposed
of in an appropriate manner and shall be handled in a manner that will not adversely impact water quality
(i.e. stockpiling near a wetland detention basin or stream, etc.).
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 444.75 feet in the main pond, the sediment shall be removed.
[For stormwater wetlands: If the elevation of the marsh areas exceed the permanent pool elevation, the
sediment should be removed to design levels. This shall be performed by removing the upper 6 inches of
soil and stockpiling it. Then the marsh area shall be excavated six inches below design elevations.
Afterwards the stockpiled soil should be spread over the marsh surface. The soil should not be stockpiled
for more than two weeks.]
When the permanent pool depth reads 444.75 feet in the forebay (and micro-pool], the sediment shall be
removed.
BASIN DIAGRAM
(fill in the blanks)
Permanent Pool Elevation 447.00
Sediment moval El. 444.7 750%1, /o
------------- ------- Sediment _Removal _E_I_e_v_a_tio_n__4_44_.75_--- 175%_
Bottom E-vation 444.00 A ,
FOREBAY
MAIN POND
Pane 1 nf2
5. Remove cattails and other indigenous wetland plants when they cover 50% of the basin surface. These
plants shall be encouraged to grow along the vegetated shelf and forebay berm.
[For wetlands: Wetland planting densities in the marsh areas should be maintained by replanting bare
areas as needed. Wetland plants should be encouraged to grow in the marsh areas.]
6. If the basin must be drained for an emergency or to perform maintenance, the flushing of sediment
through the emergency drain shall be minimized to the maximum extent practical.
7. All components of the wetland detention basin system shall be maintained in good working order.
8. Level spreaders or other structures that provide diffuse flow shall be maintained every six months. All
accumulated sediment and debris shall be removed from the structure, and a level elevation shall be
maintained across the entire flow spreading structure. Any down gradient erosion must be repaired and/or
replanted as necessary.
acknowledge and agree by my signature below that I am responsible for the performance of the seven
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.
Print name: David Goracke - for Westfield Homes of the Carolinas, LLC
Title: Vice President
Address: 4112 Pleasant Valley Road, Suite 214 Raleigh, North Carolina 27612
PhnnP- 919-789-970n
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 C1?'D/??C
County of do hereby certify that c/
personally appeared before me this day of and acknowledge the due
execution of the forgoing wet [wetland] detention basin maintenance requirements. Witness my hand and
official seal,
n? WTAWP=
WAKE CDJM
?F STATE OF NOM CAfi 1
? MAR'fA1NWAMWEAYEH
+?s myMFOKTmaaEVFiESCICf.252J0T
SEAL
My commission expiresoe 7L ?S GD
DEC 1. 2, 1005
L ctu'? 4ATER QUALITY
V.ETILWDS iJ,-D S T G;iL9''VATER SI'MCH
Pave 2 of 2
DWQ Project
DMWN OF WATER QUAUTY - 401 EXTENDED DETENTION (std POCKET') WETLAND WORKSHEET
L PROJECT INFORMATION (please the blowing information):
Project Name: Seagrove' s Farms
CantactPer= Dan Burud PhowNumb©r: (gig) 7ai -43Qo
For projects with ffvA pie basim SpeGfy vAvch basin this worksheet applies tie: Pond 45 P%l4W=t Pad E vabM 4 3 3 . 0 0 ft. (ebvabon 0( the Or" inved MA)

Ternporary Pool Elevation 434.50 fL (eimbon of the outlet *jctL 0 kwat n)

Permartert Pod Surface Area 3650 S9- fL (wabr surface am at permanent pool Wwiton)
Drairtapa Area 4.24 w- (M-Ste and e-s be drainage to to basin)
Impervious Area 1.59 ac. (w-sito and off-site drainage b the basin)
Forebay Srxbw Area 548 9q. ft. (at pOm anertt pod ebvabw approxnmaWy 15%)•
Marsh V 9- &xface Area 1278 3q. t (at permanent pool elevation approximately 35%)•
Marsh 9 -lfr Srxfaw Arca 1278 sq. t (d pormanut pool olevatim approArrut* 35%)•
fa = Pod Srface Area 548 Sq. fL (at permanent pod obvadon a Vmdma',rtlr 15%p
Temporary Pool Vokim© 6,431 cu. fL (vokme detained on top of the permanent peed
SA/DA used 1.65 (surface area b draitage area ratio)'
DiamoW of Oriirce 1 h (draw down orifice diamobor)
1. REQUIRED ITEM CHECKLIST
Initial in to space paorided bo indicale the blowing design mgjmments have been met and supporting doarm 4tion is a taadred. as
requsw mxt has not been ma4 aMxh an ogftiaWn of why: At a mra nm, a complete sbcrmwaber managornent plan submidai b xk dm
a workshod for each UP, design cabculallm. plans and Woollcations showing all BMPs and outlet sbuchn dotails, a detailed
drainage plan and a fupy exacubd Operation and ma rtmanco agwme t M incanpk to submiU padnage wit result in a roguest for
additional information and will sukslantialy delay final review and approval of the projoct
Amiga* Initials
DJB- The tortporary pod controls nwff from the 1 inch ran.
DJB Tho basin side slopes are no steopor than 3:1.
DJB A planting plan for to marsh areas wlh plant VOCICS and densities 13 provided
DJB VogoWm above the permanent pool ofeva60m is spocifiod.
M ernagwxy drain Is provided b drain the basin.
DJB'. The bmporary pool draws down in 2 b 5 days.
12`T]3i; Sedrmert sborage is provided in the pomaw pool
DJB : A sediment disposal area is provided.
?`T?? Aoooss kt provided for mairtMjrtanoe.
T). ju A sb Voci ic, signed and notarised operation and maittonanoe agrljenkxnt a pnoridod.
Ds7l; The drainage area (inck dng any oftle area) is dobxk ad on a sit<t plan.
DLTL --A=n is provided for maitbanance.
Din Plart details for ft wetland are provided.
DJB ' Plan details for the inlet and Outld are provided.
DJB A Site Wocift Operadon and malntonance aVoomo t, signed and notarwod by the rospmsible party 13 provided (See
httprJAOD.ehnr stafkt ).
• Pocket Wetlands have different design pwmvtors and are only asstxnod to remove 35% TSS - Soo pp. 19 and 20 of ft NC DENR
SbmwAft BIrP Manual, April 1999.10% open water, 50% high marsh, 40% low marsh.
WETLAND DETENTION BASIN # 5 OPERATION AND MAINTENANCE AGREEMENT
SEAGROVE'S FARM LOCATED IN THE TOWN OF APEX, NC.
The wetland detention basin system is defined as the wetland detention basin #5 , pretreatment including
forebays.
Maintenance activities shall be performed as follows:
After every significant runoff producing rainfall event and at least monthly:
a. Inspect the wetland detention basin system for sediment accumulation, erosion, trash accumulation,
vegetated cover, and general condition.
b. Check and clear the orifice of any obstructions such that drawdown of the temporary pool occurs within
2 to 5 days as designed.
2. Repair eroded areas immediately, re-seed as necessary to maintain good vegetative cover, mow
vegetative cover to maintain a maximum height of six inches, and remove trash as needed.
3. Inspect and repair the collection system (i.e. catch basins, piping, swales, riprap, etc.) quarterly to
maintain proper functioning.
4. Remove accumulated sediment from the wetland detention basin system semi-annually or when depth is
reduced to 75% of the original design depth (see diagram below). Removed sediment shall be disposed
of in an appropriate manner and shall be handled in a manner that will not adversely impact water quality
(i.e. stockpiling near a wetland detention basin or stream, etc.).
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 430.75 feet in the main pond, the sediment shall be removed.
[For stormwater wetlands: If the elevation of the marsh areas exceed the permanent pool elevation, the
sediment should be removed to design levels. This shall be performed by removing the upper 6 inches of
soil and stockpiling it. Then the marsh area shall be excavated six inches below design elevations.
Afterwards the stockpiled soil should be spread over the marsh surface. The soil should not be stockpiled
for more than two weeks.]
When the permanent pool depth reads 430.75 feet in the forebay [and micro-pool], the sediment shall be
removed.
BASIN DIAGRAM
(fill in the blanks)
V Permanent Pool Elevation 433.00
Sediment moval El. 430.7
------------- -Sediment Removal Elevation 430.75
r501,
Bottom E vation 430.00 FOREBAY MAIN POND

75%_
Pane 1 of 7
5. Remove cattails and other indigenous wetland plants when they cover 50% of the basin surface. These
plants shall be encouraged to grow along the vegetated shelf and forebay berm.
[For wetlands: Wetland planting densities in the marsh areas should be maintained by replanting bare
areas as needed. Wetland plants should be encouraged to grow in the marsh areas.]
6. If the basin must be drained for an emergency or to perform maintenance, the flushing of sediment
through the emergency drain shall be minimized to the maximum extent practical.
7. All components of the wetland detention basin system shall be maintained in good working order.
8. Level spreaders or other structures that provide diffuse flow shall be maintained every six months. All
accumulated sediment and debris shall be removed from the structure, and a level elevation shall be
maintained across the entire flow spreading structure. Any down gradient erosion must be repaired and/or
replanted as necessary.
I acknowledge and agree by my signature below that 1 am responsible for the performance of the seven
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.
Print name: David Goracke - for Westfield Homes of the Carolinas, LLC
Title: Vice President
Address: 4112 Pleasant Valley Road, Suite 214 Raleigh, North Carolina 27612
Phnne- 919-789-9700
Signa
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, Dr a Notary Public for the State :e_-
LO 0County ofdo hereby certify that ?'/1 g7personally appeared before me this 9 day of ?? GD , and acknowledge the due
execution of the forgoing wet [wetland] detention basin maintenance requirements. Witness my hand and
official seal,
?V'?'INIII'Bi'6?V.?'W..i+••.;.y?.?r: Y•+YP.i ::.
.sw,o NOTARY MW
~3 WAIF COUNTY
1 STATE Of ANN CAfR
MARY ANN WEAVER
.re WYAPPOKWENTDWIE$OCT. 25,2007
SEAL
My commission expire
Pape 2 of 2
1? .
DWQ Project
DPASION OF WATER QUALITY - 401 EXTENDED DETENTION (and POCKET? WETLAND WORKSHEET
L PROJECT INFORMATION (please co pleb the blowing nfor abon):
ProjedNam: Seagrove' s Farms
Contact Person: Dan Burud Rh)rw Number
(919) , .78l?.4,3oD..;.,.
Far projects with multiple basins, sporty which basin this aorkshod applies b: Pond # 6
Pennanernt Pod Elevalim 413.00 th (eiawabon d to Qvice imveR cuo
Temporary Pod Elevation 414.50 ft. (devatian of the outlet structure invert in)
Permanent Pod Surface Area 10,275 sq. R (water a xfm am at pemsanent pool elevation)
Drainage Area 14.28 rx (orw-ar9 and off4b df*age b the basin)
lrrpwAous Area 5.49 ac. (an-sft and ofT s tB drainap b me basin)
Forobay Surface Area 1544 sq. R (at permanent pod elevation apprordmably 15%)'
Marsh 0' 9' Surface Area 3603 sq. fL (at permanont pool deva Son approximately 35%)'
Mash l r-18* Surface Area 3603 sq. fL (at permanent pool dlevatiorn appro?droataiy 35%)'
Ucro Pod Surface Area 1544 sq. th (at permanent pool elevation apprwdmately 15%)'
Temporary Pod Vdune 17 , 14 2 CU- R (volume detained on by of to permanent pool)
SAIDA used 1.65 (surface area b drainage area rabo)*
Diametor of Orifice 2 h (draw down orifice diameler)
U. REQUIRED ITEMS CHECKLIST
Initial in the apace provided b indiicale the bbwing design rowkern eats have been met and supporting doarruxnt0on is attached. M a
rogriromer t has not been m(K alladr an eigbw Ton of WT At a minimum, a complete sbmnwalar management plan submittal includes
a workshoet for each BMP, design calculations, plane and specifications sthowing all BMPs and outlet structure details, a detailed
drainage plan and a fury axecuted operation and maintenance agroomernt. An incomplete submittal package vA result in a request for
Wd6onal information and will substantially delay fsnal review and approval of the project
A_ ppicanis lr4*
Da, The temporary pod controls runoff turn the 1 inch rain.
DJB" The basin side slopes am no steeper than 3:1.
DJB A planting plan for rte marsh areas mO plant spaces aid densities is provided
Da Vegetation above the perrnarnent pod dWation is speeded.
r),IIL_ An ertnergency drain is provided b drain the basin.
DJB The bmporary pod draws down in 2 b 5 days.
TB ;, Sediiwnt storage in provided in ft permanent pod.
D"; A sediment disposal a w Is provided.
Z`TR Amass is provided for makVINNtarnce.
h A she spook signed and notarized operation and manlenance ag WM& t is provided.
?sue The drainage area (ihckKkV any ofisib area) is deirwtad on a site plan.
is provided for mairdonanoe.
ih7B Plan details for the welland ae provided.
DJB Ran detain for the rid and outlet are providod.
DJB A site speak operation and maintenance agreement, w7iod and notarized by the responsibb party is provided (sea
hCpJlh2o.drhr.atate doc).
• Pockd Wetlands have ddfarent design para metem and are only w=ined b remove 35% TSS - See pp. 19 and 20 of Cw NC DENR
Slomwa r BMP Mawaf, April 1999.10% open water, 50% high marsh, 40% low marsh.
WETLAND DETENTION BASIN # 6 OPERATION AND MAINTENANCE AGREEMENT
SEAGROVE'S FARM LOCATED IN THE TOWN OF APEX, NC.
The wetland detention basin system is defined as the wetland detention basin #6 , pretreatment including
forebays.
Maintenance activities shall be performed as follows:
After every significant runoff producing rainfall event and at least monthly:
a. Inspect the wetland detention basin system for sediment accumulation, erosion, trash accumulation,
vegetated cover, and general condition.
b. Check and clear the orifice of any obstructions such that drawdown of the temporary pool occurs within
2 to 5 days as designed.
2. Repair eroded areas immediately, re-seed as necessary to maintain good vegetative cover, mow
vegetative cover to maintain a maximum height of six inches, and remove trash as needed.
3. Inspect and repair the collection system (i.e. catch basins, piping, swales, riprap, etc.) quarterly to
maintain proper functioning.
4. Remove accumulated sediment from the wetland detention basin system semi-annually or when depth is
reduced to 75% of the original design depth (see diagram below). Removed sediment shall be disposed
of in an appropriate manner and shall be handled in a manner that will not adversely impact water quality
(i.e. stockpiling near a wetland detention basin or stream, etc.).
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 410.75 feet in the main pond, the sediment shall be removed.
[For stormwater wetlands: If the elevation of the marsh areas exceed the permanent pool elevation, the
sediment should be removed to design levels. This shall be performed by removing the upper 6 inches of
soil and stockpiling it. Then the marsh area shall be excavated six inches below design elevations.
Afterwards the stockpiled soil should be spread over the marsh surface. The soil should not be stockpiled
for more than two weeks.]
When the permanent pool depth reads 410.75 feet in the forebay [and micro-pool], the sediment shall be
removed.
BASIN DIAGRAM
(fill in the blanks)
Permanent Pool Elevation 413.00
Sediment Removal El. 410.75 7
- -------------- -------Sediment Removal oval Elevation 410_75 75% Bottom E vation 410.001 5% - - - ---a-----
FOREBAY
MAIN POND
Pane 1 of 2.
5. Remove cattails and other indigenous wetland plants when they cover 50% of the basin surface. These
plants shall be encouraged to grow along the vegetated shelf and forebay berm.
[For wetlands: Wetland planting densities in the marsh areas should be maintained by replanting bare
areas as needed. Wetland plants should be encouraged to grow in the marsh areas.]
6. If the basin must be drained for an emergency or to perform maintenance, the flushing of sediment
through the emergency drain shall be minimized to the maximum extent practical.
7. All components of the wetland detention basin system shall be maintained in good working order.
8. Level spreaders or other structures that provide diffuse flow shall be maintained every six months. All
accumulated sediment and debris shall be removed from the structure, and a level elevation shall be
maintained across the entire flow spreading structure. Any down gradient erosion must be repaired and/or
replanted as necessary.
I acknowledge and agree by my signature below that I am responsible for the performance of the seven
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.
Print name: David Goracke - for Westfield Homes of the Carolinas, LLC
Title: Vice President
Address: 4112 Pleasant Valley Road, Suite 214 Raleigh, North Carolina 27612
Phone: [phone]
Signature: R??
Date: j Z- ) 9 /S--
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.
a Notary Public for the State eoo
/C?
County of do hereby certify that
personally appeared before me this g day of and acknowledge the due
execution of the forgoing wet [wetland] detention basin maintenance requirements. Witness my hand and
official seal,
• NOTARY MW
WAKE CGUM
STATE OF NORTH CAnO=
WMAMWEAVER
s WY APPOINT6W EXPIRES XT. 2%X07
SEAL
My commission expire 25, ?2G)07
Pave ?. of 2
DWQ Rnjoct
DMSION OF WATER DUALITY - 401 EXTENDED DETENTION (and POCKET') WETLAND WORKSHEET
L PROJECT INFORMATION (piaaas oort0010 the blowing in1=10tion):
'
Project Name: Seagrove s Farms
Contact Person: Dan B u ru d Phone Numbsr: (9 19 1 7 R 1 4
40 D
For protects with ffxMpie basins, spocify which basin this worksheet ,
applies b: Pond #8
Permanent Pod Elevation 4 2 0 . 0 0 iL (oievadon d"orifice invert OtA)
Temporary Pod Elevation .. 421.50 R (cievation of ft outlet atnrcbxe imnxt in)
Parmaner4 Pod Surface Area 4 , 0 0 0 sq. fl (water arrtaoe area at permanent pod elevation)
N*wge Area 5.10 ac (on4e and off4b drainage to the basin)
Impervious Area 1.81 a:. (o ,5ft and ofI-site drainage to ft basin)
I=* Surface Area 417 sq. R (r# permar>ant pod elevation approximately 15%)'
Marsh V go Stx*e Area 1400 sq. R (at permanent pool "melon approximately 35%)'
Marsh 9'-18' Surface Ama 1400 sq. It. (d par mwo t pool elevation approAma i* 35%)•
AMcro Pool Surface Aroa 417 sq. ft. (at permanent pool ebration apprwdmaWy 15%)'
Temporary Pod VOkime 6 , 9 6 2 CU. ft (vokume detained on top of the permanent pool)
SA/DA used 1.53 (suftce area b drainage area ratio).
in. (draw down orifice daretor)
U. REQUIRED ITEMS CHECKLIST
Initial in the space provided to indicate the idbmV design roquin3rmant3 have boon mot and supporting documentation i8 attached. ff a
requirement has not been mot MW an explamaf ion of my. At a rmdr m m, a complete sbmnwaoar management plan sub ndW includes
a worksheet for each BMP, design carlala8orss, plants and specitlcadons showing all BMPa and outlet structae details, a detailed
drainage pian and a tiny executed operation and maintenance agreement An incomplete submdtal package well roams in a request for
additional information and will sub starbaly delay final review and cnpp vM of the project
Avokw is Initials
DJB; The temporary pod oonVots nmoff from the 1 Inch rain.
DJB' The basin side slopes are no sleeper than 3:1.
' DJB' A planting plan for the marsh areas with punt species and donsities is provided.
D-TB Vegetation above the permanent pod elevation is spocibood.
JP, An emergency drain Is provided b drain the basin.
DJB" The bmporary pool draws down in 2 b 5 days.
D:713;; Sediment storage is provided in the permanent pool
T)JR ; A sediment disposal area Is provided.
L; llg,-, Access is provided for rainbnance.
llIB. - ' A sib specific, signed and notarized operation and maintenance agreanemt is provided.
DaZ The drainage area (Indudig any of(aile area) is dokmated on a site plan.
is provided for maintenance.
QJB Plan dolma for the wetland are provided.
DJB Plan details for the inlet and outset are provided.
DJB A site dpeC k Opera don and maintenance agreerment, Signed and notarised by the responiibfe party 13 provided (See
httpJAn2o.dmr.stab.nc. .doc).
Pocket Wedarnda have different design parametam and are only W=nod to remove 35% TSS - See pp. 19 and 20 of the NC DENR
Stomnwater BMP Mamd, April 1999.10% open orator, 50% high marsh, 40% bw marsh.
WETLAND DETENTION BASIN # 8 OPERATION AND MAINTENANCE AGREEMENT
SEAGROVE'S FARM LOCATED IN THE TOWN OF APEX, NC.
The wetland detention basin system is defined as the wetland detention basin #8 , pretreatment including
forebays.
Maintenance activities shall be performed as follows:
After every significant runoff producing rainfall event and at least monthly:
a. Inspect the wetland detention basin system for sediment accumulation, erosion, trash accumulation,
vegetated cover, and general condition.
b. Check and clear the orifice of any obstructions such that drawdown of the temporary pool occurs within
2 to 5 days as designed.
2. Repair eroded areas immediately, re-seed as necessary to maintain good vegetative cover, mow
vegetative cover to maintain a maximum height of six inches, and remove trash as needed.
3. Inspect and repair the collection system (i.e. catch basins, piping, swales, riprap, etc.) quarterly to
maintain proper functioning.
4. Remove accumulated sediment from the wetland detention basin system semi-annually or when depth is
reduced to 75% of the original design depth (see diagram below). Removed sediment shall be disposed
of in an appropriate manner and shall be handled in a manner that will not adversely impact water quality
(i.e. stockpiling near a wetland detention basin or stream, etc.).
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 417.75 feet in the main pond, the sediment shall be removed.
[For stormwater wetlands: If the elevation of the marsh areas exceed the permanent pool elevation, the
sediment should be removed to design levels. This shall be performed by removing the upper 6 inches of
soil and stockpiling it. Then the marsh area shall be excavated six inches below design elevations.
Afterwards the stockpiled soil should be spread over the marsh surface. The soil should not be stockpiled
for more than two weeks.]
When the permanent pool depth reads 417.75 feet in the forebay [and micro-pool], the sediment shall be
removed.
BASIN DIAGRAM
(fill in the blanks)
Permanent Pool Elevation 420.00
Sediment moval E1. 4 1 7.7 1/6
Sediment Removal Elevation-417.75 --- -75%
-
Bottom E vation 4.00 ------ A ,
FOREBAY
MAIN POND
Pave 1 of 2
5. Remove cattails and other indigenous wetland plants when they cover 50% of the basin surface, These
plants shall be encouraged to grow along the vegetated shelf and forebay berm.
[For wetlands: Wetland planting densities in the marsh areas should be maintained by replanting bare
areas as needed. Wetland plants should be encouraged to grow in the marsh areas.]
6. If the basin must be drained for an emergency or to perform maintenance, the flushing of sediment
through the emergency drain shall be minimized to the maximum extent practical.
7. All components of the wetland detention basin system shall be maintained in good working order.
8. Level spreaders or other structures that provide diffuse flow shall be maintained every six months. All
accumulated sediment and debris shall be removed from the structure, and a level elevation shall be
maintained across the entire flow spreading structure. Any down gradient erosion must be repaired and/or
replanted as necessary.
I acknowledge and agree by my signature below that I am responsible for the performance of the seven
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.
Print name: David Goracke - for Westfield Homes of the Carolinas, LLC.
Title: Vice President
Address: 4112 Pleasant Valley Road, Suite 214 Raleigh, North Carolina 27612
Phnna- Q1Q-7RQ-Q7nn
Sign,
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, 6-6e )) ( Z -6" , a Notary Public for the State oy??f
County o l?Q /-e--. , do hereby certify than
personally appeared before me this day of , 5?'45Z5, and acknowledge the due
execution of the forgoing wet [wetland] detention basin maintenance requirements. Witness my hand and
official seal,
`.1'Nfe^9aIIV: 'S'S''i i'.•.'. ri 1"fv `<"-'dB:•VJ
? u ?',? 'NOTA,'iY PIfDLJC
a? ?{ WAI??WCTIMYrwu
nT?
J SATE OF NOM CAFiCLPJA
ti MARY ANN WEAVER
i' ? ,,, htt APr'OIMitEN7 E)PWE$ OCT. 25, 200'7
.wrsrritwe+?wFa.e?.ertM
SEAL
My commission expires(-.*,? 2.S Z-OD
Pane ?. of 2
t
DWQ Pro)ed
DMSION OF WATER QUALITY - 401 EXTENDED DETENTION (and POCKET') WETLAND WORKSHEET
L PROJECT INFORMATION (please complete the Mowing W mwtion):
ProodNam: Seagrove' s Farms
Contact Person: Dan Burud Phone Number: (91 91 791. (1.400 - ,::.. ,?.;..;,..._.:
For projects with multiple basins, specify which basin to workshoot applies to: Pond #10
Porno wd Pod Elevation 419.00 ff. (devabon 01 the Mike Mvert Out)
Temporary Fbd Ebvaiion 421.60 IL (elevation of Itb outlet sbixt re itr"t in)
Permanwd Pool Surface Area 5 , 6 5 0 4 ft (rater surface am at permanent pool elevation)
Drainage Area 7.32 ac. (or -sk and oft-sits &*,age to the basin)
1rnp 0oa Area 3.00 as (on-site"of 4 is draitiage to fie basin)
Forebay Surface Area 856 sq. R (at ponnanent pod elevation appro*uiely 15%)'
Marsh 0'-9' Surface Area 1999 sq.1 (at permanent pod elevation eQp D m * 35%)'
Lash 9"-181 Surface Area 1999 sq. fL (d permanent pod elevation approxirr a oly 35%)'
Macro Plod Surface Area 586 3q. fL (at permanent pod elevation apprwkddy 15%)'
Temp xary Pool vol rno 9 , 611 CU. ft (volume detained on top of the permanent pool)
used
SAI A
1
7
(surface area to drainage area ratio).
Orifice
> .5 h (draw down orifice dianneter)
ll. REQUIRED ITEMS CHECKLIST
Initial in fie space provided to indicate the blowing design mq*w ants have boon met and supporting doamwdabon is attached. it a
mquirement has not been met, aftgcb an eiPlasatian of W y At a minimum, a cor plrte sbm wafer mar?apwnerd plan submittal indudes
a wakehad for each BlrP, design calcul* rs, plena and spodfaallons showing all BIPs and outlet structure details, a detailed
submitlai package ail result in a request for
drainage plain and a fu2y a= operadoin W4 ? approval of the project
additad Infamabon and will Substadialy delay
Applicants Initials
DJB- _ The temporary pool controls nrroff from the 1 inch rain.
DJB' The basin side slopes are no steeper than 3:1.
' DJB A plantig plan for the marsh areas with plant apsdes and dWCAW is provided.
D,TB Vegetation above the permanent pod elevation is S mAW.
n ' . M wnorge ncy drain Is provided b drain the basin.
DJB-- The temporary pod draws down in 2 to 5 days.
P? . __Sadrner t storage is provided in the pomr><roont pod.
D,-rB A sediment disposal area 13 provided.
1;1;R,,, Aooosa is provided for maintenance.
rnjg, A she specific, signed and notarized operation and m*u%narooo agreement is pnovidW.
?J?3 , The drainage area (kxkxkg any oftle area) is delineated on a site plan.
Is provided for mainferarm.
prB Plan dotab for the wetland are provided.
D,7B Plan dafarls for the inlet and outlet are Providod.
DJB A site specific operation and malRlOw" agreement, Signed and ndaired by the responsible P24 13 PfOVided (See
tdtpl/tr?o.otn Aft.nc. .doc).
' Pocket Wetland: have different design parameters and am only assumed b remove 35% TSS - Soo pp. 19 and 20 of the NC DENR
Sbnrw®br UP 6tarx?al, April 1999.10% open water, 50% high marsh, 40% low marsh.
WETLAND DETENTION BASIN # 10 OPERATION AND MAINTENANCE AGREEMENT
SEAGROVE'S FARM LOCATED IN THE TOWN OF APEX, NC.
The wetland detention basin system is defined as the wetland detention basin #10 , pretreatment including
forebays.
Maintenance activities shall be performed as follows:
After every significant runoff producing rainfall event and at least monthly:
a. Inspect the wetland detention basin system for sediment accumulation, erosion, trash accumulation,
vegetated cover, and general condition.
b. Check and clear the orifice of any obstructions such that drawdown of the temporary pool occurs within
2 to 5 days as designed.
2. Repair eroded areas immediately, re-seed as necessary to maintain good vegetative cover, mow
vegetative cover to maintain a maximum height of six inches, and remove trash as needed.
3. Inspect and repair the collection system (i.e. catch basins, piping, swales, riprap, etc.) quarterly to
maintain proper functioning.
4. Remove accumulated sediment from the wetland detention basin system semi-annually or when depth is
reduced to 75% of the original design depth (see diagram below). Removed sediment shall be disposed
of in an appropriate manner and shall be handled in a manner that will not adversely impact water quality
(i.e. stockpiling near a wetland detention basin or stream, etc.).
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 416.75 feet in the main pond, the sediment shall be removed.
[For stormwater wetlands: If the elevation of the marsh areas exceed the permanent pool elevation, the
sediment should be removed to design levels. This shall be performed by removing the upper 6 inches of
soil and stockpiling it. Then the marsh area shall be excavated six inches below design elevations.
Afterwards the stockpiled soil should be spread over the marsh surface. The soil should not be stockpiled
for more than two weeks.]
When the permanent pool depth reads 416.75 feet in the forebay [and micro-pool], the sediment shall be
removed.
BASIN DIAGRAM
(fill in the blanks)
Permanent Pool Elevation 419.00
Sediment moval El. 416.7 7 /o
-------------- -- ------Sediment Removal Elevation 416_75 75%
- - - - - - --- -------
Bottom E vation 416.00 5% A
FOREBAY
MAIN POND
Pane 1 of?.
5. Remove cattails and other indigenous wetland plants when they cover 50% of the basin surface. These
plants shall be encouraged to grow along the vegetated shelf and forebay berm.
[For wetlands: Wetland planting densities in the marsh areas should be maintained by replanting bare
areas as needed. Wetland plants should be encouraged to grow in the marsh areas.]
6. If the basin must be drained for an emergency or to perform maintenance, the flushing of sediment
through the emergency drain shall be minimized to the maximum extent practical.
7. All components of the wetland detention basin system shall be maintained in good working order.
8. Level spreaders or other structures that provide diffuse flow shall be maintained every six months. All
accumulated sediment and debris shall be removed from the structure, and a level elevation shall be
maintained across the entire flow spreading structure. Any down gradient erosion must be repaired and/or
replanted as necessary.
I acknowledge and agree by my signature below that I am responsible for the performance of the seven
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.
Print name: David Goracke - for Westfield Homes of the Carolinas, LLC
Title: Vice President
Address: 4112 Pleasant Valley Road, Suite 214 Raleigh, North Carolina 27612
Phone: [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.
a Notary Public for the State
County of do hereby certify that
hi? G G
personally appeared before me this day of and acknowledge the due
execution of the forgoing wet [wetland] detention basin maintenance requirements. Witness my hand and
official seal,
IP?'JJ'JJ`JwIY:•c,3'Y?-.^a?f'' • y ?1 y?
?S1nR?4 NOTARYfMMI
WAKE OaKff
1 STATE OF NOM CAROlrL1
NARY ANN WEAVER
MYAPPOINTAiFMWIRES OCL25 MU
.0001.
SEAL
My commission expire s0 ?--5 -zD?
Pace 2 of 2
DVVQ Project No.
DMSION OF WATER QUALITY - 431 EXTENDED DETVIMN (vW POCKET') WETLAND Y."ORKSHEET
L PROJECT INFORMATION (please con npleb the Mowing rrrformation):
ProjwNm*: Seagrove' s Farms
Contact Parson: Dan B u ru d Phone Number.' (919) , 7Qi -?, o o For project with multiple baeans, spo* which barn ft workshoet app€fos tD: Pond # 10
Pormianont Pod Edevston 419.00 fL (elevation of to aft ffrmd out)
Tcrriporry Pool EJ zdm 421.60 fL (dw lion of the outid stft t invert in)
Porma rat Pod Surface Area 5 , 6 5 0 sq. ft (wrator pxtaoe area at Porrilariont Pod )
Drainage Ama 7.32 rec. (an-sile and off-£rte drdnage to ft bin)
Impervious Area 3.00 W- (W-3b and Off-3it0 drainage to the basin)
Forebay Surface Aroa 856 sq. ft (at permranerd pod elevation app D*'kt* 15%)•
Marsh 0'-9' Surface Area 1999 sq. t (at ponnanent pool elevation approxr ,** 35%)•
Marsh 9'-18' Surface Aroa 1999 sq. fL (r2 permL'lnef t pool deWatiDn appm nately 35%p
Micro Pod Surface Area 586 sq. it (at permanent pool abvation approximately 15%)'
Temporary Pod Volurn© 9 , 611 a. fL (vol une dotdnod on top of the pamnanont pool)
SAIDA usod 1.77 (Surface area to drainage =a ratio)'
Diarr>dnr of Ofiku 1.5 in. (draw down orifice diarne w)
11. REQUIRED ITM CHECKLIST
Initial in the space provided to inc5caae ftxi following design regctrements have boon met and supporting doaun on is attached. K a
mquirer"t has ?not boon met afth an eA larrabor? of My. At a munimxm. a complete storm dw managornant plan submitd iridudes
a wmkd*d for each BMP, design calaUions, plara and Wookadons diowing all BMPs and outlet drnchre dews, a detallod
drainage plan and a bulgy executed operation and maintenance agreoment. An inconrpVA subn>zttal package vA M&A in a request for
additional information and will substanti* delay final review and appiwd of the pupa
Applicant Initials
DJB• The temporary pool contrds runoff from tho 1 Inch rain.
DJB• The burin side slopes are no sleeper than 3:1.
DJB A planting plan for the marsh areas with plant Wodes and don saw is provided.
DtTB Vegetation above the permanent pod elevation 13 spod5od.
wjXTg; An ernnergency drain Is provided b drain the basin.
DJs' The temporary pod draws down in 2 b 5 days.
TVT3?; Sediment storage is provided in the parmaxxnt pool.
n,Tn ;._A sodkno nt disposal area IS provided.
gk=S,; Access is provided for mantonance.
do speak signed and notarized operaft and maintenance agreor w a p vAdod.
l2a The drainage area (inckdi ng any ottrb area) is de5r>oaied on a site plan.
is provided for mainwnance.
V JB Plan dogs for the wetland are provided.
DJB Plan detaU for ft inlot and eutkt are provided.
DJB A 8b specs k: WWAon and rnaMternanoo agreorrnant, srgnod and odar by the roapMStgo party is provdod (see
httpJfi2o.dw-st&j c. doc).
• Pocket We kv& have MOW design paramnotm and are onty assungd b rorrove 35% TSS - Soo pp. 19 and 20 of the NC DENR
Sbmrw*r BW Manual, April 1999.10% opon water, 50% high marsh, 40% low marsh.
WETLAND DETENTION BASIN # 10 OPERATION AND MAINTENANCE AGREEMENT
SEAGROVE'S FARM LOCATED IN THE TOWN OF APEX, NC.
The wetland detention basin system is defined as the wetland detention basin #10 , pretreatment including
forebays.
Maintenance activities shall be performed as follows:
After every significant runoff producing rainfall event and at least monthly:
a. Inspect the wetland detention basin system for sediment accumulation, erosion, trash accumulation,
vegetated cover, and general condition.
b. Check and clear the orifice of any obstructions such that drawdown of the temporary pool occurs within
2 to 5 days as designed.
2. Repair eroded areas immediately, re-seed as necessary to maintain good vegetative cover, mow
vegetative cover to maintain a maximum height of six inches, and remove trash as needed.
3. Inspect and repair the collection system (i.e. catch basins, piping, swales, riprap, etc.) quarterly to
maintain proper functioning.
4. Remove accumulated sediment from the wetland detention basin system semi-annually or when depth is
reduced to 75% of the original design depth (see diagram below). Removed sediment shall be disposed
of in an appropriate manner and shall be handled in a manner that will not adversely impact water quality
(i.e. stockpiling near a wetland detention basin or stream, etc.).
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 416.75 feet in the main pond, the sediment shall be removed.
[For stormwater wetlands: If the elevation of the marsh areas exceed the permanent pool elevation, the
sediment should be removed to design levels. This shall be performed by removing the upper 6 inches of
soil and stockpiling it. Then the marsh area shall be excavated six inches below design elevations.
Afterwards the stockpiled soil should be spread over the marsh surface. The soil should not be stockpiled
for more than two weeks.]
When the permanent pool depth reads 416.75 feet in the forebay [and micro-pool], the sediment shall be
removed.
BASIN DIAGRAM
(fill in the blanks)
Permanent Pool Elevation 419.00
Sediment moval El. 416.7 7 /o ------------ -- ----------------------------- Sediment Removal Elevation 416_75 -75%
--- ------
Bottom E vation 416.00 5% A
FOREBAY
MAIN POND
Pape 1 of 2
5.. Remove cattails and other indigenous wetland plants when they cover 50% of the basin surface. These
plants shall be encouraged to grow along the vegetated shelf and forebay berm. P
[For wetlands: Wetland planting densities in the marsh areas should be maintained by replanting bare
areas as needed. Wetland plants should be encouraged to grow in the marsh areas.]
6. If the basin must be drained for an emergency or to perform maintenance, the flushing of sediment
through the emergency drain shall be minimized to the maximum extent practical.
7. All components of the wetland detention basin system shall be maintained in good working order.
8. Level spreaders or other structures that provide diffuse flow shall be maintained every six months. All
accumulated sediment and debris shall be removed from the structure, and a level elevation shall be
maintained across the entire flow spreading structure. Any down gradient erosion must be repaired and/or
replanted as necessary.
acknowledge and agree by my signature below that I am responsible for the performance of the seven
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.
Print name: David Goracke - for Westfield Homes of the Carolinas, LLC
Title: Vice President
Address: 4112 Pleasant Valley Road, Suite 214 Raleigh, North Carolina 27612
Phone: [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 ?•^o/rr
County of do hereby certify that
personally appeared before me this day of ?4 - , Zz'5-, and acknowledge the due
execution of the forgoing wet [wetland] detention basin maintenance requirements. Witness my hand and
official seal,

•u R
h
4 NOTARY REW
3. vrAaCtX1NTY
STATE OF NOMCw7J M
h'.1M NNYXAVM
- h! YAiiQNTbffMEXFS==.25,MU
SEAL
My commission expire'O? ZS ZDD
Pave ?. of 2
DWQ Projoct No.
DMSION OF WATER QUALITY - 491 EXTENDED DETENTION (crud POCKET') WETLAND WORKSHEET
L PROJECT INFORMATION (piem co rsplicte the folov Q Kdorrmation):
PmjedHam>s: Seagrove' s arms
CantactPorson: Dan Burud Phowkxriber: (9191 781 !Z .
For projects with murxipte gins, spodfy which basin tha wortahvot applies to: Pond # a
Psrnumt Pod Elevation 420.00 tt (olevaom of the orifice invert oUQ
Temporary Pool Elovotion 4 21.5 o R (elevator of the outlet structure invert in)
Porman t Pod Surface Area 4 , 0 0 0 sq. fL (*,Aw surface area at porniarert pod devadon)
D-& age Area 5.10 rr. (on-silo and Oft &alnago to to basin)
Impervious Area 1.81 ac. (on-site and oftte drainage to the basin)
Forebay Surface Area 417 sq. ft. (at perrnane t pool elevation approAmatety 15%)•
Marsh V-9' Surface Area 1400 sq. ft. (el permanent pool elevation approximately 35%)'
Marsh 9'-18' Surface Area 1400 sq. R (r3 permanent pod elevation opproAnatety 35%)'
Micro Pod Surface Area 417 sq. ft. (at pemwmt pool elevation apprwdm'atdy 15%)6
Torrrporary Pool Volume 6 , 9 6 2 CU. ft. (volume dots ned on top of ft permanent pool)
SAiDA used 1.S3 (surface area to drainage area rabop
Diamctor of Oribce 1 h (draw down ordice diarnetarj
It. REQUIRED iTELIS CHECKLIST
InW in the space providod to in clicate the fol ov*V design requirements have boon mot and supporting doaunontation is attached. N a
roquimrment has not been met atcr an explanation of W y. At a m k*mffn, a complete stommdw management plan submittal includes
a vMofthoot for each BMP, design cal nations, plaru and spwilcations showing all BMPs and outlet structure details, a detailed
drainage plan and a fu?y exaeeuded operation and mraintw=ce aWwno >L An irwripleto a bmtttal padwge YA result in a request for
WdEtiorurl iri mmaion and will substantially delay final review and approval of the project
A&pbc nts Ini -
DJBI The temporary pool controb runoff from the 1 inch rain.
DJB' Tho basin side siopos are no steeper than 3:1.
DJB" A planting plan for the marsh areas with plant species and dertsitios i3 provided.
Ate. Vegetation above the permanent pod elevation i3 specified.
..LUL*. An emergency drain b provided to drain the basin.
DJB'. The Tmporary pool draws down in 2 to 5 days.
D TB.w Sedim o t storage is psavided in the pomsanont poot.
n.TU ;.-A 3odkvd disposal area Is provided.
?;'IB , A-nmss is provided for maimtonanco.
T.U11 A sb s peafic, signed and notarizod operation and maintenance agreernort 13 provided.
naa _ The drainage area (kxkxkg any ofle area) is delineated on a site plan.
Is provided for maintananoo.
D,7B Plan details for the wetland are provided.
D,7B _ _Plan drteda for the trdot and outlet are provided.
DJB A Efts specifk operation and mairr6anarrce agroornomt, s grad and rota =d by ttxe responsibb party J3 provided (we
httpJfiZo.ohnr atato.nc.u&bcwodanWomdrn.doc).
' PocW Wetlands have different design parameters and am only assured b remove 35% TSS - See pp. 19 and 20 of tha NC DENR
Sfnr wAw BMP Manuad, April 1999.10% open water, 50% high marsh, 40% tow marsh.
WETLAND DETENTION BASIN # 8 OPERATION AND MAINTENANCE AGREEMENT
SEAGROVE'S FARM LOCATED IN THE TOWN OF APEX, NC.
The wetland detention basin system is defined as the wetland detention basin #8 , pretreatment including
forebays.
Maintenance activities shall be performed as follows:
After every significant runoff producing rainfall event and at least monthly:
a. Inspect the wetland detention basin system for sediment accumulation, erosion, trash accumulation,
vegetated cover, and general condition.
b. Check and clear the orifice of any obstructions such that drawdown of the temporary pool occurs within
2 to 5 days as designed.
2. Repair eroded areas immediately, re-seed as necessary to maintain good vegetative cover, mow
vegetative cover to maintain a maximum height of six inches, and remove trash as needed.
3. Inspect and repair the collection system (i.e. catch basins, piping, swales, riprap, etc.) quarterly to
maintain proper functioning.
4. Remove accumulated sediment from the wetland detention basin system semi-annually or when depth is
reduced to 75% of the original design depth (see diagram below). Removed sediment shall be disposed
of in an appropriate manner and shall be handled in a manner that will not adversely impact water quality
(i.e. stockpiling near a wetland detention basin or stream, etc.).
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 417.75 feet in the main pond, the sediment shall be removed.
[For stormwater wetlands: If the elevation of the marsh areas exceed the permanent pool elevation, the
sediment should be removed to design levels. This shall be performed by removing the upper 6 inches of
soil and stockpiling it. Then the marsh area shall be excavated six inches below design elevations.
Afterwards the stockpiled soil should be spread over the marsh surface. The soil should not be stockpiled
for more than two weeks.]
When the permanent pool depth reads 417.75 feet in the forebay [and micro-pool], the sediment shall be
removed.
BASIN DIAGRAM
(fill in the blanks)
Permanent Pool Elevation 420.00
Sediment moval El. 417.7; 75%
-------------- -- ------Sediment Removal Elevation 417.75 --- -75%
- - - - - - ------
Bottom E vation 417.00 5%
FOREBAY
MAIN POND
pipe 1 of
5. Remove cattails and other indigenous wetland plants when they cover 50% of the basin surface. These
plants shall be encouraged to grow along the vegetated shelf and forebay berm.
[For wetlands: Wetland planting densities in the marsh areas should be maintained by replanting bare
areas as needed. Wetland plants should be encouraged to grow in the marsh areas.]
6. If the basin must be drained for an emergency or to perform maintenance, the flushing of sediment
through the emergency drain shall be minimized to the maximum extent practical.
7. All components of the wetland detention basin system shall be maintained in good working order.
8. Level spreaders or other structures that provide diffuse flow shall be maintained every six months. All
accumulated sediment and debris shall be removed from the structure, and a level elevation shall be
maintained across the entire flow spreading structure. Any down gradient erosion must be repaired and/or
replanted as necessary.
acknowledge and agree by my signature below that I am responsible for the performance of the seven
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.
Print name: David Goracke - for Westfield Homes of the Carolinas, LLC,
Title: Vice President
Address: 4112 Pleasant Valley Road, Suite 214 Raleigh, North Carolina 27612
Phone: [phone]
Signature: r
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,
County o L22/?-e--. , do hereby certify than/ Xx-
personally appeared before me this day of y ,?74!25, and acknowledge the due
execution of the forgoing wet [wetland] detention basin maintenance requirements. Witness my hand and
official seal,
`dATie'-w4d's'h^?'a?? •.' ? r+ TrJ :'c 9I3
urn oh, NOTARY PLCUC
WAKE CIM
i t STATE OF NOffM CA.'i iA
MZR
WM ANN ?•?.. MY AFFOINT'wMC"sOCT.ZS,Za
SEAL
My commission expires /' ?S SOU
Pane 9. of 2
DWO Proloct
DMSION OF WATER QUAUTY - 401 EXTENDED DETENTION (and POCKETS WETLAND WORKSHEET
L PROJECT DiFORNATION (*m corroeb ttm Uaft intmx w):
ProjwNxw: Seagrove' s arms
ContactPorson: Dan Burud PtarmNunbar: (gig) Sgl
For propcts win name b=n3, spocify which bow fhia woricIW cpplic3 tD: Pond # 6
Pc m oont Pod Elvi;tan 413.00 R (dwabon of ftte W= Mvcd Out)
Ta Vwq Pod Ekw b1 414.50 Q. (&wcbm of ft OUtid *jcbN'O kwcd in)
Parma nont Pod Srxface Aroa 10,275 4 R (wator sufa00 am ct POnttai ont pod C?2va5on)
Drinage Area 14.28 (on-5b aw off-aita dfai k' ge to ft basin)
1RlpwA= Artie 5.49 EC (on-sb End d kb drainage to ft twin)
Forebay Suface Atca 1544 sq. I (r:t pema x d pod ovation appro>antat* 15%)'
Marsh 0'-9' Surface kca 3603 sq. tL (Et pEan1wont pool oWabon app(0)Dnkai 35%)'
Marsh 9"•18' Surboo Area 3603 sq. R (r3 pormxwt pool eavation cpproAnl* 35%)'
Mi= Pod Surfaco Area 1544 sq. it. (d pttrmanent pool eldva5on a'pWxima* 15%)'
Twpwjy Pod Vokxm 17,142 CU. ft (voltum dct*W on top of tho pOnTmont pool)
SAIDA used 1.65 (surface =a b drainago cm tabor
DOW" of Orifice 2 h (draw down Orifice diartrr'ar)
U. REQUIRED (TELIS CHECKUST
Initial in ttb space previdod to kdcWA tho ib5ovkg design mqurernetts have beat met and &Wrtig downanfabon i3 dladx4 N a
roquirwnW has not been maf: athxh an ojpbmUDn of shy. At 3 mninw. a triplets sbmwiator ntar?agornont plan u bmitd indrdes
a wakshod for each BMP, design caluga5 s, plants mW gm5cabon3 sho" W BMPs and outlet shxtrrre dohs, a dotailkl
drainage plan and a fUlt' I excartfld operation and mahW n? agroarted. An irwnpkAe submittal padrape wU rosin in a request for
additional inbortnabon and wil a bstanti* dolay final review and ipprovd of the p upd
Aooicartts Irtia,?Fs
_ --DJB- The temporary pool controls r=ff from ttte 1 inch rain.
DJB" The basin side dopes rte no steeper than 3:1.
' DJB _ A plrtrdV plan for the marsh areas wit plant spodes End d=. s i3 provided.
pa I Vegetation above ttta permanent pod dwalion i3 g ocifiod.
D6111- - An aragoncy drain Is provided b drrtirt tiro basin.
DJB. The tirrtporory pool draws down in 2 b 5 days.
DJ139; Sodhw t storage 13 VgAdod in ft porrrt;rW pool.
D,TR : A soda rxnt dispwd aw is provided.
.. RATS ,?. Aco= i3 Provided for manananco.
p+IU- , A nit Vedi; WW End notwr oporn5an and rrmfttanoo agre moat is Provides.
? Tha dranage aroa (irtckxW g any oftb area) 13 clokmaibd on a site plan.
is provided for rnai< wrolco.
DJB Plan dotad3 for ft wetland are provided.
DJs Plan detd3 for the irtkt w4 outlet are provided.
DJB A aP=ft aporatbn and n=tonarm agrWnortt, UgnW and notarized by rho responsible party is provided (Soo
httpJfi2o.ehnr.stnte.nc doc).
Pod d Wotlands have ddferortt design parartmt= and am only a sumod b rorrov0 35% TSS - San pp. 19 and 20 of ftx3 NC DENR
Sbmwabr BMP Manual, April 1999.10% open w&r. 50% high mash, 40% low marsh.
WETLAND DETENTION BASIN # 6 OPERATION AND MAINTENANCE AGREEMENT
SEAGROVE'S FARM LOCATED IN THE TOWN OF APEX, NC.
The wetland detention basin system is defined as the wetland detention basin #6 , pretreatment including
forebays.
Maintenance activities shall be performed as follows:
After every significant runoff producing rainfall event and at least monthly:
a. Inspect the wetland detention basin system for sediment accumulation, erosion, trash accumulation,
vegetated cover, and general condition.
b. Check and clear the orifice of any obstructions such that drawdown of the temporary pool occurs within
2 to 5 days as designed.
2. Repair eroded areas immediately, re-seed as necessary to maintain good vegetative cover, mow
vegetative cover to maintain a maximum height of six inches, and remove trash as needed.
3. Inspect and repair the collection system (i.e. catch basins, piping, swales, riprap, etc.) quarterly to
maintain proper functioning.
4. Remove accumulated sediment from the wetland detention basin system semi-annually or when depth is
reduced to 75% of the original design depth (see diagram below). Removed sediment shall be disposed
of in an appropriate manner and shall be handled in a manner that will not adversely impact water quality
(i.e. stockpiling near a wetland detention basin or stream, etc.).
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 410.75 feet in the main pond, the sediment shall be removed.
[For stormwater wetlands: If the elevation of the marsh areas exceed the permanent pool elevation, the
sediment should be removed to design levels. This shall be performed by removing the upper 6 inches of
soil and stockpiling it. Then the marsh area shall be excavated six inches below design elevations.
Afterwards the stockpiled soil should be spread over the marsh surface. The soil should not be stockpiled
for more than two weeks.]
When the permanent pool depth reads 410.76 feet in the forebay [and micro-pool], the sediment shall be
removed.
BASIN DIAGRAM
(fill in the blanks)
Permanent Pool Elevation 413.00
Sediment moval El. 410.7; 7 /°
-------------- -- ----------------------------------------- Sediment Removal Elevation 41 075 --- 175%
Bottom E vation 410.00 5% e ------
FOREBAY
MAIN POND
Pape 1 of?
,5. R6move cattails and other indigenous wetland plants when they cover 50% of the basin surfacer These
plants shall be encouraged to grow along the vegetated shelf and forebay berm.
[For wetlands: Wetland planting densities in the marsh areas should be maintained by replanting bare
areas as needed. Wetland plants should be encouraged to grow in the marsh areas.]
6. If the basin must be drained for an emergency or to perform maintenance, the flushing of sediment
through the emergency drain shall be minimized to the maximum extent practical.
7. All components of the wetland detention basin system shall be maintained in good working order.
8. Level spreaders or other structures that provide diffuse flow shall be maintained every six months. All
accumulated sediment and debris shall be removed from the structure, and a level elevation shall be
maintained across the entire flow spreading structure. Any down gradient erosion must be repaired and/or
replanted as necessary.
I acknowledge and agree by my signature below that I am responsible for the performance of the seven
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.
Print name: David Goracke - for Westfield Homes of the Carolinas, LLC
Title: Vice President
Address: 4112 Pleasant Valley Road, Suite 214 Raleigh, North Carolina 27612
Phone:
Signature
Date:
919-789-9700
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.
a Notary Public for the State o
County of do hereby certify that
personally appeared before me this 4 day of ,?,?_ , ,2, and acknowledge the due
execution of the forgoing wet [wetland] detention basin maintenance requirements. Witness my hand and
official seal,
vav. aar?;sv.' rv rowe,arc
NOTAW PL"
VVXE C0U M
3 J IM STATE OF K%TH CA'W4A
` WIRY AM V&VM
`- ' UlYAPPON-i.iENTEX ISOCT.25,W
SEAL
My commission expires 02? Z-S, ?2e?)07
Pane 2 of 2
e-
DWO Project
DMMN OF WATER QUALITY - 401 EXTENDED DETENTION (and POCKET`) WETLAND MRKSHEET
L PROJECT INFORMATION (pie-= compW ft M wing information):
Pr*dName: Seagrove' s arms
Contact Person: Dan Burud Pt*m Number (9191 7 R 1 - o A o o
_
For projects with mWb* basins. sp9p/y vft h basin finis workshwt appilos to: Pond #5
Peenawr>t Pool EIOvzbm 433.00 ft. (dev^bon of iho MAW Invert ou)
TornpWrry Pod Elevation 434.50 ft (dwation of -a pl dJot strUCtUre rlYort in)
Pormanknt Pool Surboo Area 3650 sq. it (w=r wrface ante at pcunmoil pool dov&Wn)
Drrtaag© Anna 4.24 aaC ( " and ofi-site &&a go to to basin)
Impervious Area 1.59 a?C (W,5itO aid W -5ft damage t D fine basin)
Forebay Surbw Area 548 4 ft (art pormanorit pool oiwWon appm*u ey 15%)'
Marsh W-9' Surface Area 1278 sq. ft (Lt perT mont pool devaabon opproarmwety 35%)•
Marsh 9'4 B' Surtaw Area 1278 sq. R. (at permanent pool devation appr'o* tdy 35%)'
LG= Pod &xfaaw Area 548 sq. ft (aA pwwxmt pool of vation aapproximatey 15%)•
Tomperry Pool Vo xw 6 , 4 31 CU. fL (VOt= dctcln0d on top of the ponrolt d pool)
SA/DA usod 1.65 (arrfaw aroa to drainage area ratio)'
Diener for of Orifice 1 h (draw down or9 diaamew)
U. REQULRED ITEf3S CHECKLIST
indd in the space provided to indicate the b 5ovaag design roquim eats have bean met and supporting doarraortabon is a dactod. if a
tt>arriiamod has not boon mat: aftax h an oxplambm of shy At a manirxm. a compioW sbmrwdw managorr ad plan submittal bxiudes
a vorkshoat for each BMP, design colaga5m. plans and spookations shoung 0 BMPs and outlet sbuctura dolab, a doU,bd
drainage plan and a Uy eaxacutaad operation and maintonanm agroo nont An incarapldo sutamdU package w;l razor in a roguast for
additional cbmabon and will subst ntialy delay final review and a Mvd of the projoct
Aiyrogz I-
DJB• The tamporary pool controls runoff from tho 1 inch rain.
DJB' The ba3in side Slopos are no staopor than 3:1.
DJB A planting plan for lho marsh areas with plant spoC and demos a provided.
nom, Vegetation above the prxrraaraent pod olovation is spearaod.
aTB': An emergency drain Is provided b drain the basin.
DJB . The brtporary pool draws down in 2 b 5 days.
DT" SodinlOnt Storage is providod in to P==Mt poWL
DJB : A wdimont d'rfaosd area b provided.
L?'T$ ? Am= is provided for m*Wnmw.
g?, A rba specific, signori and noU=Dd oporbon and ma,kr W w= agroomont is provada
_I?a The drainage area (Inckrdng any offula area) is dolineated on a .:tai plan.
QJB iS provided for mairdManw.
D TB Plan details for the wodand are pravidod.
DJB Plan doted3 for the inlet and w W are provided.
DJB A S;W q= k Wperbon and ma;itibenanW Womxnt, WW and ra Ulzod by the responsM party is provided (Soo
MtpJ&tb.dxar.stato.nc.doc).
• Po*d Wo&x& hwo ditbW design parameters and are only a35uraod to romove 35% TSS - Soo pp. 19 and 20 of the NC DENR
Sbormarabr UV Mamd, April 1999.10% open w&r, 50% high marsh, 40% low mama.

WETLAND DETENTION BASIN # 5 OPERATION AND MAINTENANCE AGREEMENT
SEAGROVE'S FARM LOCATED IN THE TOWN OF APEX, NC.
The wetland detention basin system is defined as the wetland detention basin #5 , pretreatment including
forebays.
Maintenance activities shall be performed as follows:
1. After every significant runoff producing rainfall event and at least monthly:
a. Inspect the wetland detention basin system for sediment accumulation, erosion, trash accumulation,
vegetated cover, and general condition.
b. Check and clear the orifice of any obstructions such that drawdown of the temporary pool occurs within
2 to 5 days as designed.
2. Repair eroded areas immediately, re-seed as necessary to maintain good vegetative cover, mow
vegetative cover to maintain a maximum height of six inches, and remove trash as needed.
3. Inspect and repair the collection system (i.e. catch basins, piping, swales, riprap, etc.) quarterly to
maintain proper functioning.
4. Remove accumulated sediment from the wetland detention basin system semi-annually or when depth is
reduced to 75% of the original design depth (see diagram below). Removed sediment shall be disposed
of in an appropriate manner and shall be handled in a manner that will not adversely impact water quality
(i.e. stockpiling near a wetland detention basin or stream, etc.).
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 430.75 feet in the main pond, the sediment shall be removed.
[For stormwater wetlands: If the elevation of the marsh areas exceed the permanent pool elevation, the
sediment should be removed to design levels. This shall be performed by removing the upper 6 inches of
soil and stockpiling it. Then the marsh area shall be excavated six inches below design elevations.
Afterwards the stockpiled soil should be spread over the marsh surface. The soil should not be stockpiled
for more than two weeks.]
When the permanent pool depth reads 430.75 feet in the forebay [and micro-pool], the sediment shall be
removed.
BASIN DIAGRAM
(fill in the blanks)
Permanent Pool Elevation 433.00
Sediment moval El. 430.7 /o
-------------- -------Sediment Removal oval Elevation 43_0_75 ___ 175%_
Bottom E vation 430.001-7501 A
FOREBAY
MAIN POND
Pane 1 of
5. 'Remove cattails and other indigenous wetland plants when they cover 50% of the basin surface. Tliese
plants shall be encouraged to grow along the vegetated shelf and forebay berm.
[For wetlands: Wetland planting densities in the marsh areas should be maintained by replanting bare
areas as needed. Wetland plants should be encouraged to grow in the marsh areas.]
6. If the basin must be drained for an emergency or to perform maintenance, the flushing of sediment
through the emergency drain shall be minimized to the maximum extent practical.
7. All components of the wetland detention basin system shall be maintained in good working order.
8. Level spreaders or other structures that provide diffuse flow shall be maintained every six months. All
accumulated sediment and debris shall be removed from the structure, and a level elevation shall be
maintained across the entire flow spreading structure. Any down gradient erosion must be repaired and/or
replanted as necessary.
acknowledge and agree by my signature below that I am responsible for the performance of the seven
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.
Print name: David Goracke - for Westfield Homes of the Carolinas, LLC
Title: Vice President
Address: 4112 Pleasant Valley Road, Suite 214 Raleigh, North Carolina 27612
Phone: [phone]
Signa
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, err C_!r» ?G? , a Notary Public for the State o U?D ?i?l?- ,
County of , do hereby certify that/??ti?lf ?7G C
personally appeared before me this 9 day of GD _, and acknowledge: the due
execution of the forgoing wet [wetland] detention basin maintenance requirements. Witness my hand and
official seal,
'?1NiPMFp?w?.a.SY.'r,1?.'rn P.J: •-,..v y.,.?4p
ua,ti NOTARYPuac
^ ? o 3 W'AFZ COUNTY
F{ STATE OF Nof TH "-OOUk A
'
6L'r"YANNWEAVER
?, :. .TY AFPC94TMENT EXPIRES OCT. 25, 2M7
SEAL
My commission expireo?? ?? Zed
pane 7 of 7
4
DWQ Project
DMSION OF WATER QUALITY - CH EXTENDED DETENTION (and POCKET? WETLAND WORKSHEET
L PROJECT INFORMATION (please complete the foiaang iribrmation):
Project Nam: Seagrove' s Farms
Contact Person: Dan B u rud Phone Nurmber: (gig) 7 g i 0.4 o o
For projects with ffxrftlple bates, Specify W*h basin titis wort *xA applies to: Pond 44
Pbrm'nont Pool Elevation 447.00 ft (obvadon of the orifice invert put)
Temporary Pool EW bon 448.50 fL (elevation of the oudd stnx hxe invort n)
Ponnanont Pod Surface Area 3550 sq- tL (water surface area ct pomtanont pool uViation)
Drainage Area 4.58 ac. (on-sb and off-site drainage to the bacln)
Impervious Area 1.86 ac. (on-site and asite drainage to the basin)
Forebay Surface Area 542 4 ft. (at permanent pool elevation approximately 15%)0
Marsh 0•-9' Surface Area 1261 sq. ft (at permanent pool elevation approximately 35%)•
Marsh 9"-18' Surface Area 1261 sq. IL (at ptxrrB=t pool elevation apprvnknately 35%r
Lie o Pod Surface Aroa 542 sq. ft (at permanent pool gyration gVrox irrsatdy 15%)-
Temporary Pod Volum 6 , 5 4 3 cu. ft (vole ma detained on top of the permmanontt pool)
SAIDA
o 1.77 (glace area b drainage area ratio)'
Diameter
OriGco In. (draw down orifice diameter)
U. REQUIRED ITEUS CHECKLIST
Indiai in the space provided to indicate the b lovang design roquirements have been mat and supporting documentation is attached. ff a
requiroment fra8 not been mat abch an e*bmbon of wiry. At a mk*mxn. a complete sbfi walor managomemt plan submittal includes
a wo tEhoot for each BMP, de3lgn calculations, plain and Spocifications dvm-g al BMPs and outlet structrro dotails, a detailed
drainage plan and a Wy exoctrtad operation and maintenance agreorrat An incomplota submittal paduape will result in a request for
additional iribmation and will substaRtiafy delay final review and approval of the projoct
Appicarib Initiate
„ „- DJS' The temporary pod controls nrroff from ft 1 Inch rain.
D B The basin side slopes am no st x4w than 3:1.
DJB A *&V plan for the marsh areas vWh plant species and donsdas is prwidod.
Da Vegetation above the permanent pod elevation is spocifrod.
r Wig, M a nergency dram is provided b drain ft basin.
DJB The WMoraty pool draws down in 2 b 5 days.
Imo; 7B? ` Sedimord Sbra9e is pwided in ft Pei Mont POOL
D,TB i A sodMent dir°osd arts Is providod.
1;1TS.;;. Aooess i3 Provided for maintenance.
rtTn. A stie specific, signed and notarized operation and maintenance agreement is provided.
_" The drainage area (hdud'ing any dfsite Oros) is dolinwW on a site plan.
12JB -Am= is provided br mantonano©.
DJB Plan details for ft wetland are provided.
DJB Plan dot93 for ft inlet and Outlet are prwidod.
DJB A site Vedic operation and manta== agroomont, Wood and notafaod by the rosPoosrbie party 13 VUAdod (Soe
titlpJnQD.OtY1rzW.nc.u&[e-mail]).
• Pocket Wadands have Weront design parameters and are only assurnal to mwm 35% TSS - Soe pp. 19 and 20 of the NC DENR
Sbrmw*f Bw Manual, April 1999.10% opon water, 50% high marsh, 40% low marsh.

WETLAND DETENTION BASIN # 4 OPERATION AND MAINTENANCE AGREEMENT
SEAGROVE'S FARM LOCATED IN THE TOWN OF APEX, NC.
The wetland detention basin system is defined as the wetland detention basin #4 , pretreatment including
forebays.
Maintenance activities shall be performed as follows:
After every significant runoff producing rainfall event and at least monthly:
a. Inspect the wetland detention basin system for sediment accumulation, erosion, trash accumulation,
vegetated cover, and general condition.
b. Check and clear the orifice of any obstructions such that drawdown of the temporary pool occurs within
2 to 5 days as designed.
2. Repair eroded areas immediately, re-seed as necessary to maintain good vegetative cover, mow
vegetative cover to maintain a maximum height of six inches, and remove trash as needed.
3. Inspect and repair the collection system (i.e. catch basins, piping, swales, riprap, etc.) quarterly to
maintain proper functioning.
4. Remove accumulated sediment from the wetland detention basin system semi-annually or when depth is
reduced to 75% of the original design depth (see diagram below). Removed sediment shall be disposed
of in an appropriate manner and shall be handled in a manner that will not adversely impact water quality
(i.e. stockpiling near a wetland detention basin or stream, etc.).
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 444.75 feet in the main pond, the sediment shall be removed.
[For stormwater wetlands: If the elevation of the marsh areas exceed the permanent pool elevation, the
sediment should be removed to design levels. This shall be performed by removing the upper 6 inches of
soil and stockpiling it. Then the marsh area shall be excavated six inches below design elevations.
Afterwards the stockpiled soil should be spread over the marsh surface. The soil should not be stockpiled
for more than two weeks.]
When the permanent pool depth reads 444.75 feet in the forebay [and micro-pool], the sediment shall be
removed.
BASIN DIAGRAM
(fill in the blanks)
Permanent Pool Elevation 447.00
Sediment moval El. 444.7 /o
------------- -------Sediment Removal Elevation 444_75 75%
- - - - - - --- -------
Bottom E-vation 444.001-7511 A
FOREBAY
MAIN POND
Pape 1 of?.
5. Remove cattails and other indigenous wetland plants when they cover 50% of the basin surface. These
plants shall be encouraged to grow along the vegetated shelf and forebay berm.
[For wetlands: Wetland planting densities in the marsh areas should be maintained by replanting bare
areas as needed. Wetland plants should be encouraged to grow in the marsh areas.]
6. If the basin must be drained for an emergency or to perform maintenance, the flushing of sediment
through the emergency drain shall be minimized to the maximum extent practical.
7. All components of the wetland detention basin system shall be maintained in good working order.
8. Level spreaders or other structures that provide diffuse flow shall be maintained every six months. All
accumulated sediment and debris shall be removed from the structure, and a level elevation shall be
maintained across the entire flow spreading structure. Any down gradient erosion must be repaired and/or
replanted as necessary.
I acknowledge and agree by my signature below that 1 am responsible for the performance of the seven
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.
Print name: David Goracke - for Westfield Homes of the Carolinas, LLC
Title: Vice Presid
Address: 4112 Pleasant Valley Road, Suite 214 Raleigh, North Carolina 27612
Phone: [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, ?- r» CLOG ?? , a Notary Public for the State of
County of »? , do hereby certify that personally appeared before me this day of ;?? ,24r5`5 , and acknowledge the due
execution of the forgoing wet [wetland] detention basin maintenance requirements. Witness my hand and
official seal,
NOTAR-YPLQIC
w'AIl COLIM
STATE OF NUTM C+L'l INA
WRY ANN WEAY6i
MY APPOINTMENT E)2M OCT. 25, X9
SEAL
My commission expirese/ e TL ?-S Z 60
Pane 2 of 2
DWQ Project No.
DM=N OF WATER QUALITY - 41 EXTENDED DETENTION (and POCHM VYETLAND WORKSHEET
L PROJECT INFORMATION (please compls*a the foflovring information):
ProodName: Seagrove' s Farms
CantadPorsorr: Dan Burud Phone Number: (tea 701 -3BsZ:;.
For projocts with nxdq* ba=, spo* which basin On work?roet appfias te: Pond #1
_
Pcfmanod Pod Ezra ion 410.00 R. (elevation of ft wsco grmn VA
Tompoary Pod Bov bon 411.50 fL (devatfon of the artlct structure invert in)
Permanent Pod Surface Area 9800 sq. ft (vjztN orfaee area at permanent pool aeva+ion)
Dra inage Area 10.72 W. (on-sac and o8-site drainage to the ba"°irrr)
Impervious Area 4.69 ac. (af?-site and off-site & =098 to the t": n)
Feebay Surface Area 1470 sq. ft (at pemwent pod oforadon apprordnmd* 15%)'
Marsh 0' 9' Surface Area 3430 sq. ft (at perma ont pool okrrabon approximately 35%)'
Marsh 9' =18' Surface Area 3430 sq. R (ct po manent pod aeration approxtna * 35%)'
LS= Pool Surface Area 1470 sq. ft (at pamarrent pod olovation apgoximlay 15%)'
Temporary Pod Voluna 16,088 cu• ft (volume dct;kod on top of ft pwffa xrt pool)
SAIDA used 1.86 (surface area to drainage arcs ratio).
Diameter of Orifice 2 In. (draw down Wke diartator)
If. REQUIRED ITELtS CHECKUST
Initial in ft space provided to bdoao the b5ovang design rogdr ronerrta have boon met and supporting docurno won is attaclx4 It a
roqurw)od hm not boon mot altadr an oVb7abw of WV At a minimum, a compW sSorrmv*r management plan submdU mcludes
a wcrkstrod for each BMP, design calculations. Plana and spvaScatim showng al BM and outlet structure dotails, a dotalod
drainage plan and a fuly exoar`ed operation and makdonance agr©enent. An incomplete submiW package w4 r=A in a request for
additional infomabon and will substantially dolay final review and rrpprovd of the project
Aaoicanta Ir?i *
DJB- The temporary pool controls r noff from the 1 inch rain.
DJB " The basin side slopes are no sWopor than 3:1.
DJB A planting plan for the marsh arena with plant modes and dons-6es is provided.
Lei. Vogetstim above ft pormanent pod olovabon is spedfxxf.
pjTB,- ^ M emergency drain is provided lo drain ft bairn.
DJB•. The lsxrrporaq pool drama down in 2 lo 5 days.
DJB,; Sediment storage is provided in fJie permanent pool.
DJR • A sediment disposal area Ia provided.
.QIR Access is provided for maifntarnance.
.. T-hZn, A sb spode, signed and notarized operation and moontonance agreement Ia provida
nJa ? The drop ge area (induarrg airy d1silo area) is dolirwa tod on a sate plan.
is provided for rrrairrtonarrc©.
V TB Plan detala for the wetland are provided.
DJs Plan detain for the inid and outlet am provided.
DJB A site specific O MWon and maintenance agrocrr=t signed and notanzod by the rosponsW party 13 praridod (see
httpJIhZo.drr ztoW.rrc .doc).
' Pockd Welanda have differed design pararnetrrss and are only a=imod lo ronove 35% TSS - Soo pp. 19 and 20 of the NC DENR
SWmrw*r BMP Mamd, April 1999.10% open water, 50% high marsh, 40% low marsh.
WETLAND DETENTION BASIN # 1 OPERATION AND MAINTENANCE AGREEMENT
SEAGROVE'S FARM LOCATED IN THE TOWN OF APEX, NC.
The wetland detention basin system is defined as the wetland detention basin #1 , pretreatment including
forebays.
Maintenance activities shall be performed as follows:
After every significant runoff producing rainfall event and at least monthly:
a. Inspect the wetland detention basin system for sediment accumulation, erosion, trash accumulation,
vegetated cover, and general condition.
b. Check and clear the orifice of any obstructions such that drawdown of the temporary pool occurs within
2 to 5 days as designed.
2. Repair eroded areas immediately, re-seed as necessary to maintain good vegetative cover, mow
vegetative cover to maintain a maximum height of six inches, and remove trash as needed.
3. Inspect and repair the collection system (i.e. catch basins, piping, swales, riprap, etc.) quarterly to
maintain proper functioning.
4. Remove accumulated sediment from the wetland detention basin system semi-annually or when depth is
reduced to 75% of the original design depth (see diagram below). Removed sediment shall be disposed
of in an appropriate manner and shall be handled in a manner that will not adversely impact water quality
(i.e. stockpiling near a wetland detention basin or stream, etc.).
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 407.75 feet in the main pond, the sediment shall be removed.
[For stormwater wetlands: If the elevation of the marsh areas exceed the permanent pool elevation, the
sediment should be removed to design levels. This shall be performed by removing the upper 6 inches of
soil and stockpiling it. Then the marsh area shall be excavated six inches below design elevations.
Afterwards the stockpiled soil should be spread over the marsh surface. The soil should not be stockpiled
for more than two weeks.]
When the permanent pool depth reads 407.75 feet in the forebay [and micro-pool], the sediment shall be
removed.
BASIN DIAGRAM
(fill in the blanks)
Permanent Pool Elevation 410.00
Sediment moval El. 407.7-7 /o
-------------- - ------Sediment Removal Elevation 407_75 --- 175%
------
Bottom E vation 407.00 5% ® ,
FOREBAY
MAIN POND
Pape 1 of 9.
+5. Remove cattails and other indigenous wetland plants when they cover 50% of the basin surface. These 1
plants shall be encouraged to grow along the vegetated shelf and forebay berm.
[For wetlands: Wetland planting densities in the marsh areas should be maintained by replanting bare
areas as needed. Wetland plants should be encouraged to grow in the marsh areas.]
6. If the basin must be drained for an emergency or to perform maintenance, the flushing of sediment
through the emergency drain shall be minimized to the maximum extent practical.
7. All components of the wetland detention basin system shall be maintained in good working order.
8. Level spreaders or other structures that provide diffuse flow shall be maintained every six months. All
accumulated sediment and debris shall be removed from the structure, and a level elevation shall be
maintained across the entire flow spreading structure. Any down gradient erosion must be repaired and/or
replanted as necessary.
I acknowledge and agree by my signature below that I am responsible for the performance of the seven
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.
Print name: David Goracke - for Westfield Homes of the Carolinas, LLC
Title: Vice President
Address: 4112 Pleasant Valley Road, Suite 214 Raleigh, North Carolina 27612
Phone- q19-7A9-q7nn
Signs
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, w:d
h? _,a Notary Public for the State of
Coun y of f?O A'L-- , do hereby certify that??.?-?l
personally appeared before me this / day of yPc- and acknowledge the due
execution of the forgoing wet [wetland] detention basin maintenance requirements. Witness my hand and
official seal,
^o wwf R=
k4 STATE OF NXM CAtaM
MAflY ANN WEAVER
.?rA MY /v'FOINTIAE"ITEWES OCf.25.20('i1
SEAL
My commission expires _7 _. 5
z f
Pave 7 of 2
C4 X Soil & Environmental Consultants, PA
11010 Raven Ridge Road • Raleigh, North Carolina 27614 • Phone: [phone] • Fax: [phone]
? www.Sand EC.com
December 12, 2005
S&EC Project #7416.W1
DWQ Project #05-1985
Department of Environment and Natural Resources
Division of Water Quality uality 71
Attn: Cyndi Karoly
2321 Crabtree Boulevard
Suite 250
Raleigh, NC 27604 ;
;v ;GH
Qi_?114 {.i SI ?..
Re: Reply to the Division of Water Quality's Request for the Seag'ove's Farm 401
application, Wake County, NC
Dear Ms. Karoly:
The purpose of this letter is to respond to your December 5, 2005 letter requesting further
information. The original questions/requests are copied below as they appear on the
12/05/05 letter and are then followed by our response to each.
AdditioualInforntation Requested:
1. Please provide diffuse flow provision measures (level spreaders along with
worksheets showing how they were designed) and show them on the site plans.
Although the proposed project is within the Neuse River Basin, and the project as a whole
is less than 30% impervious, the applicant is proposing six (6) extended detention
wetlands throughout the proposed project for the Town of Apex. These extended
detention wetlands are designed as per the NC Department of Environment and Natural
Resources, Division of Water Quality, Stormwater Best Management Practices (April
1999) design guidelines. As per and 15A NCAC 02B .0233, stormwater outfalls that are
constructed within the riparian buffer is an "allowable" use provided that a stormwater
management facilities are installed to control nitrogen and attenuate flow. In addition,
according to the NC Division of Water Qualities "Draft Level Spreader Design Options,
Version 1.0" (October 10, 2001), direct discharge of stormwater through the riparian
buffers is also considered an "allowable" use when best management practices are used to
remove the nutrients and/or pollutants in question, this "allowable" use requires written
approval from the Division of Water Quality. Therefore, our client is requesting written
approval from the Division of Water Quality to construct these stormwater outfalls within
the riparian buffer and directly discharge the stormwater to the stream.
Charlotte Office:
236 LePhillip Court, Suite C
Concord, NC 28025
Phone: [phone]
Fax: [phone]
Greensboro Office:
3817-E lbwndale Drive
Greensboro, NC 27455
Phone: [phone]
Fax: [phone]
2. Please provide separate impact maps for each individual buffer impact, as is
typical of applications submitted by your company. These separate drawings
were not provided for this particular application, and we find them very
helpful in interpreting your project plans.
Attached are sheets 1 through 5 which include separate impact maps at a 1" = 50' scale
for each individual buffer impact, stream impact and wetland impacts.
Please call if you have any questions or require further explanation.
Sincerely, Sincerely,
Sean Clark Deborah Edwards
Project Manager/Environmental Scientist Environmental Specialist
Attachments:
1) Revised impact maps, sheets 1-5
2) Extended detention wetland worksheets, ponds #l, 4, 5, 6, 8 and 10
3) Extended detention wetland plan & profile, ponds #1, 4, 5, 6, 8 and 10
2
SOIL & ENVIRONMENTAL CONSULTANTS, PA
Cneck Nuaber: 656
NC Division of Water Quality
Date: 10/27/05 Check PTmt: $475.00
Tran # Invoice Type Date Reference Balance Discount Pay Amount
8763 102705 Invoice 10/27/05 7416.W1 $475.00 $0.00 $475.00
Eta; kjjI?nO 891 Qt -LN30 3??1
SOOZ 8 Z 170
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- - 34 0 SE _ EL, ,:407, pD ~ _ EL. =09..00 ~ ~ - ~i _ - ~ I SCIRPUS PUNGENS-159 ~j
- _ ER I VAT-E~ ~ _ - HYh1=NAGALLIS GAROLINIANA-85 ` CANNA F'LAGGIDA-5
DRA 1-NAGS - ° \ i fl RIS VIRGINIGA-42 / ~f JUNCOS BIFLORIJS-103 /
\ a JUNCOS BI F~~W.JS-202
SEM _ ~ ° ~ ENT \ ; - 1 ° PRIVATE ,
3. I / - / o ti ,tl 4 DRAT NAGS sAURU 5 ~~RNUUS-156
.SLOPES, ~ 36 ~ 1=ES EASEMENT CANNA LA IDA-4 y~; 1
- ~ 1 WATER - ` ' I , ° jf
MH# I 0 ~ ~ M I CP.O POOL ~ RETAIN 'N W ouauTr a / I ALL , ~ ORIFICE +r
~ ~ ` 14~G 'SF ° f - ~ - KEYSTQNE YPE PES#86 \ EL. -407>, 00 ~ ,
_ - ~ - 6 H I,GH W HAN A I L li MI GRO l j`
_ - 4 GI #8 -l _ _ _ (SEE Nb AN a / . POOL ,1
„ W/ ROLL - _ , LF , a , ~ r ~ NOTE #J3? ' ~ ~ INVERTED PVC ° V CANNA FL~ALG I DA-3 FUREBAY
36 TE \ ~ ~ ° 8 _ ~ ~X, SIPHON PIPE ~ / 9,: ~ pp ~ ` / PELTANDRA VIR61N1C -91 /
- - ~ _ a OUTLET PIPE \ 2 PRI VA ~ f - ~ UTIET I E ..f _ _
D~AIN~6E E / ~ I , I
~ 1 \ i ~ - EX.
~ ~ ~ ~ 1 \ W/ ROLL 4 PLUG VALVE 4 i ~ / / ~ ~
~ EA _ T i - 1 E a ° - , ~ IN / / i_..
, ,GRATE ~ ~ ~ ~ i ~ ~ ~ ~i ~ ~ SAGIT RIA ATIFOLIA-184
~ fi 20 TOWN I i ~
i ~ \ OF ASE ~ ~ ZIZAN A ATIGA-1040
\ _ a i i S ~ - a ° fi~(~ _ ~A ~ ~UT1 t ITY A ~ a ~ Q NYM'H A TA-4 T ~ ~ 2
/ ~ , ~ d ESMT: X H'f h1=N AL I S CAROL I N IANA-2~ I
~ _ 2 LF OF 4 OIP ~ INVERT '#)I _ \ ~ \ a ~S PELTANDRAtViR61N~6A=223_ _
~ ~ ~ ~ UTILITY ~ A
3 ~ 2 X 2 YARD 5 E NLET W/ TRASH RACK pro A E - • - ESMT, ~ - -
T 5 ANDARD DETAIL 5.02 ' EN R€ ` ° ~ o
FOR INVERTS AND ELEVATIOPIS SEE PROFlLE THIS SHEET I I ~ - ~
_ ~ N6T TO SCALE ~ ~ Plant List - Stormwater • ' i Wetland
1 F+i ~ x Bow. oc.
19 CAN?r1 FLAGGIDA GOLDEN GAI~MU1 3' A \ 1
TOPOF DAH 914 PANGUM VI~h1U1.1 9hUTGHGRA95 3' N ~ CANNA FLACCI DA-3
M 1 N I d i 90' -41450 gl{,yp 906 HTh~IOGALLl9 GAROLINWIA SPIDER LILY ~ SCIRPUS PUNGENS-$3
59 IW5 vNZ61WGA BLUE FLAG IRIS gun n ~ 305 &FLOWn SHORE WISH y
J - 4ri~ ~ 1 HYM~HAEA ODORATA 6 ~ 32+~~ O FRAGRANT NU4TER ULY g~ I k
314 P~TANORA VIR5INIGA ARROIV ARUM Ip~ ~
a 11 _ _ ~ - - - _ - _ - - - - - - - - - - _ _ _ RIP-RM 656 PONIEDEWA CORDATA PIGKBiEL PEED 18' _ i ,
SA6ITTARIA LATIFOLUI BROADLEAF ARROYYEAD 18' I i ~ / 316 /
4 ~ X 2' YARD I NLE - Z 3'13 GERNU5 LIIARD5 TAIL 1' pg6 5G~113 PlJH6915 THR~-Sp1ARE BULRUSH IB' /
~ _ _ OVERFLOW SPILLWAY DETAI L $ - - - - - - - - - - _ _ _ 430 ZIZANIA AGUAT~1 ~ ~ ' 1458 YpLD RIDE IB
43 ,p TOP 411.50 NOT TO SCALE NOTE:
m~ -THE CONTRACTOR SHALL SEED AND MULCH ALL BARE AREAS NOT COVERED BY PLANT ' MATERIAL AFTER CONSTRUGTIO'J IS COMPLETE. SILT FENCE SHOULD REMAIN IN PLACE
~u UNTIL GRASS HAS BECOME ESTABLISHED. '
-SOIL DEPTH MI NIMJM SHALL BE 4'. •
- - OUTLET DEVICE INFORMATION N~
~ v 2' X 2' riser with an 18' RLP Barre I
30 foot rip rap lined secondary spillway
_ _ _ _ _ _ _ _ O Normal Pool Elevation x10.00 - -
Top of Water Quality Pool Elevation 411.50 - Pr i nc i pa I Sp i I I way E I evat i on 41 1.50 ABSTRACT ABSTRACT PRIEST, CRAVEN 4 ASSOCIATES, INC.
RETAINING__ ~ _ _ _ - 2 Year Water Surface Elevatio;i 412,01 LAND USE CONSULTANTS
420 10 Tear Water Surface Elevation 413.06 This analy~ 420 Secondary Spillway Elevation. 413.20 requiremen This analysis was conducted in order to comply with the City of Roleigh Stormwater management 3808-8 COMPUTER DRIVE, SUITE 104 requirement of limiting the post development runoff to that which would have occurred under RALEIGH, N. C. 27609
' ~ 100 year Water Surface Elevation 413.79 pre-develol pre-development conditions during the two year design storm. HYDR
Top of Berm Elevation 414.50 ~ ~ OLOGIC DATA SEAGROVES FARM
HYDROLOC I C Forebay Elevation 407.00 HYDROLOGIC ANALYSIS CENTER STREET, APEX FILE NAME SEAGROVESFARMD4.123
_ ~ fit', ~ Id TOP OF RM EL.=414.50 High Marsh Elevation 409.50 - Low Marsh Elevation 408.50 The rationr DRAINAGE POINT I - POST DEVELOPMENT DATE ; NOV 21, 2005 The rational formula was used to determine the expected peak discharges for each set of conditions. The
. \ I YR. WATER SURF EEL.-413,80 Micro Pool Elevation 407,00 time of cor time of concentration was determined usinq the Kirplch Equation, The storm hydrograph and the time to WATERSHED LAND USE DATA
15, CO LF ~ SPI Y EL. =419, 20 peak of the ~ Method out peak of the hydragraph were determined in accordance with the Small Watershed Hydrograph Formulation Method outlined in H. Rooney Malcom s 'Elements of Urban Stormwater Design". TRACT DESCRIPTION SOIL C. AREA
- - - _ - - - - - ` - I YR. WATER SURF EEL.=413,20 Water quality pool drawdown orifice diam 2.0 in ® 3.93x _ _ _ I Drawdown time from falling head orifice 2.6 days N0. GROUP AC.
I 1 YR. WATER SURf EEL. =412, 10 Run a f f v o l i Runoff volumes were determined usinq the Soil Conservation Service methodolagy as outlined in NEN-4, ° I BUILDINGS AND STREETS B 98 0.95 4.69
- - 8' SS - - - - - Runof f coei Runoff coefficients and curve numbers were taken from standard values based on land use in accordance 2 LANDSCAPE AREAS B bl 0.35 6.03
- REVIEW CERTIFICATION BY THE TOWN OF APEX with cnaw, 4 = 410 10 NoRrw. EL. 410.00 with Chow, Malcom, and NEH-4. 3 UNDISTURBED WOODED AREAS B b0 0.20 0.00
` Hydrologic Hydrologic soil groups were determined based on the Wake County Soil Survey and the soils information TOTALS AND COMPOSITE NUMBERS 77.2 0.61 10.72
_ - - - - contained i uASS B ~ This drawing has been reviewed by the Town of Apex, and to the best of my knowledge and contained in NEH-4.
RIP-Rl1P ~ belief, conforms to the requirements established in the Standard Specifications of the Town of Ro i n f a I I i r Rainfall intensities were taken from National Weather Service data complied by Malcom in Exhibit 2 of TIME OF CONCENTRATION
t NL-~T _ _ _ _ - - - - Apex. However, tibia signahue does not constitute a variance firm any requirements contained ° E I e me n t s c 'Elements of Urban Stormwater Design'.
in an federal state or local code law ecificafion rule or ordinan e. ' D =13 _ y , sp c The developerleng~neer/ Tapagraph i By TR-55 methodology, printout attached 0,19 HR Topographic Information used in determining drainage areas and hydraulic lengths was taken from the 11.4 MIN
I ~ contractor is solel res 'ble for mee ' all liable uirements. city o f Ro I DEPTH=22' 2' DI A, y ~ ~ ~p ~ Lit of Ralei h 61 a y q S d ta.
~dATER QUN.I Y I ~ EXIS IN6 RUNOFF AMOUNTS
_ _ _ - By: Date: Determine runoff volume from S. C, S, procedures
PRIEST, CRI - - - LAND USE CC vv PRIEST, CRAVEN t ASSOCIATES, INC. LAND USE CONSULTANTS linch Storm
- _ - _ _ _ - -{-2~~4----- _ _ - - - - - - 3808-B COhff 3808-B COMPUTER DRIVE, SUITE 104 Rainfall I,00 inches
4O0 ~ 400 RAL E I Gli 1~NTI SOIL EROSION AND SE~ Il~IENTATI N. D ON CONTROL RALEIGH, N. C. 27604 CN 77,2
R1 N - ~ - - _ _ _ - _ CERTIFICATION BY THE TOWN OF APEX HYORa.ool c „ w ~ g L=10.0' _ _ SEAGROVES F HYDROLOGIC DATA From Buildings and Streets 13465 cf
O fT~00--C1~- TJ~S; Or- CENTER STRE SEAGROVES FARM From Landscape Area 278 cf CENTER STREET, APEX FILE NAME : SEAGROVESFARMD4,123 From Undisturbed Wooded Are 0 cf
ncaru_~N - - z z z N - - - - - This drawing has been reviewed by the Town of Apex, and to the best of my knowled a and DRA I NA6E Pc DRAINAGE POINT I - PRE DEVELOPMENT DATE : NOV 21, 2005
- - - e I . ezs - g Z D =6. belief, conforms to tine requirements established in the Soil Erosion and Sedimentation Control WATERSHED L Average Runoff = 0.353 inches WATERSHED LAND USE DATA Total Runoff Volume = 13743 cf
v ~ 13.4 F, Ordinance of the Town of Apex. However, this signature does not constitute a variance from
~o= TRAGT DES - - - - any requirements contained in any federal, state, or local code, law, specification, rule or No. TRACT DESCRIPTION SOIL C. AREA 2 year storm N0, GROUP AC. 24 hour, 2 year rainfall 3.60 inches
ordinance. The developer/engineerlcontractor issolely responsible for meeting all applicable CN 77.2
- requirements. I BU I u u 2 GLE I BUILDINGS AND STREETS B 98 0.95 0, 04 2 CLEARED FIELDS, PASTURE B b9 0.35 7,06 Runoff = 1.518 inches
' THLS SIGNATURE DOES NOT CONSTITUTE PLAN APPROVAL, ONLY PLAN 3 RoH _ - ----------Z 390 3 ROW DROPS B 75 0.45 0.00 Runoff Volume = 59068 cf
390 - - REQUIREMENTS. A SEPARATE LETTER OF PLAN APPROVAL WILL BE MAILED 4 uNc 4 UNDISTURBED WOODED AREAS B 60 0,20 3,55
TO THE FINANCIALLY RESPONSIBLE PERSON AT A LATER DATE ACCORDING TOTALS AND 10 year storm TOTALS AND COMPOSITE NUMBERS 66.3 0.31 10.70 24 hour, 10 year rainfall 5.38 inches
- TO THE CONSTRUCTION SEQUENCE, cN 77.2 alulq
By: Date: r I ME of coN ~~4 TIME OF CONCENTRATION Runoff = 2.96 inches ~ ~ ~ R~
_ _ _ By Runoff Volume = 115236 cf ~ 0~` D
By TR-55 methodolagy, printout attached 0.3 HR ~~:Q ~y'y 18,0 MIN 9
DETERMINE THE ANTICIPATED STORAGE VOLUMES ~ S
- - REVIEW CERTIFICATION BY THE TOWN OF APEX RUNOFF AMOu _ - PUBLIC WORKS AND UTILITIES RUNOFF AMOUNTS .N 58 _ s $
Determine r Determine runoff volume from S. C, S. rocedures Woter Quality requirements mandate control of the i~ .o~• ~ p runoff from the I inch storm. 13743 cf i'A~„~,
380 This drawing has been reviewed by the Town of Apex Public Works and Utilities De artment 2 ear stor p y Town of ex GY Rq ~P@ 2 year storm Ap dinances ~ Y ~
and to the best of my knowledge and belief, conforms to the requirements established in the mandate control of the 2 and 10 ear sto 37083 cf ~NIAUQ~ 24 hour, 2 year rainfall 3,60 inches y
Standard Specifications and Construction Details and the Unified Development Ordinance of the CN 66, 3 ,I,Illllllllllfl//i EXTENDED DETENTION WETLANDS SIZING CALCULATIONS ~ CARP ~I~
Town of A ex. However this si tore does not constitute a va ' ' p gna Hance from any requirements ~ Runoft - 0.868 inches Q /~i~i,
- - - - contained in any federal, state, or local code, law, specification, rule or ordinance. The Size an extended detention wetlands to treat the runoff from the site ~ ~ EE 9 Runoff Volume 33729 cf ~ p ~ ~ •
- developerlengineerl contractor is solely responsible for meeting all a liable re uirements. I o ear Stogy Normal pool depth 3 feet SAL 10 year storm Impervious cover ercenta e of the tract 0.44 % •
pp q y 24 hour, 10 year rainfall 5,38 inches p q
A . AA 1 AA ~'1 . AA 7 . M J . AA _ , Surface Area to Drainage Rrea Ratin I f1h ~ 56~
~ crrw i tw irw ~*w ~rrw ~ ~ ay: nay: ~ l,ltl UO. l ~ ~ ;
Runoff = 2.01 inches Required Surface Area 0,20 ac
Runoff Volume 78153 cf 8686 s f ~qs F, Surface Area Provided 9800 5 f
REVISED
SEAGROVE ' S FARM "S5H" PLAN t PROF ILE
PRIEST.C-RAVEN & ASSOCIATESINC,
F SINGLE FAMILY c TOWNHOUSE SUWIvIsIoN DATE: DECEMBER 2005 EXTENDED DETENTION WETLAND F ILELIA 5. WOMBLE GHRITRBLE TRUST APEX, NORTH CAROLINA PROJECT: 2002-024.001 MD POND # I LAND USE CONSULTANTS PLANNERS / LANDSCAPE DESIGNERS / SURVEYORS I ENGINEERS 3803 - B Computer Drive, Suite 104 Raleigh, N.C. 27609. Phone 919 / 781-0300. Fax [phone]. Email [e-mail] 1421
PRELIMINARY NOT-RELEASED FOR CONSTRUCTION

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I I srD~nsa~ JuRlsolala~nL o 0 0 ~ 404 I,oO7 I~ ~ ~
2 I STOfd15H43t JURISDICTICNAL 0 0 0 6O6 406 I, 012 / ~ '
ORWNTER DEVICE JURISDICTIONAL 957 0 0 0 0 0 ,J,;'~' 1 ~ "
4 2 ROAD GROSSING JURISDICTIONAL 301 0 0 0 0 0 - ~ , 6 3 ROADGR0551NG JURISDICTIONIL 0 918 91 PERPINDIGULM 7,247 4,785 12032 ~ ~ ~ 3 _ A / ~
PARI~LLEL 3, 671 b, 916 10, 537 ~
j~ ~ ~ ( V ~ l 4 JURISDICTIONAL 0 0 0 623 430 1053 ~ ~ ~ ~ ~ / ~ ~ ~ ~ STORM SEIfR I i ~
i J l r 9 4 SANITNtY SEDER Jl~ISDIGTIGNAL 0 360 30 Z 163 I, 209 3, 312 ~ % ~
10 4 STORMSB~ER JURISDICTIONAL 0 0 0 645 454 1,099 i ~ I ,
tl 4 ROAD GROSSING JURISDICTIONAL 452 0 0 0 0 0 y ! I , ~ l
12 4 SANITARY56ER JURISDICTIONAL 0 195 40 2,71A I, 102 3,616 ~ 1 - ~C - ~ `~J ~ - 13 4/5 ROAD GROS51 N6 JURI SDI GTI ONFL 0 639 146 7, 929 4, 050 11, 979 ~ ~ ~
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TOTALS I, 710 2, 112 307 26, 201 19, 75b 45, 907 r 1 l~ 1~ ~ i ~
' SCALE: I' •30U I TE
SE P E T RA N ~'L SSOC A S INC. ~GROV~ 5 FARM ~ s vE DATE JULY 25, 2005 ~ ~ A 51 N6LE FM11 LY MID TOMIHCllSE SUE01 VI SI GN LAND USE CONSULTANTS PLANNERS 1 LANDSCAPE DESIGNERS! SURVEYORS I ENGINEERS
LELIA 5. NOMBLE CNRITABLE TRUST NgtTH LAR0.INA PROJECT: 2002-024.001 aeat•a Campnw Drive, 9iim t04 Ratcigh,x.e.27609.rnonevtsr~atu+oo.eavt9r~a2-t288.Emeil Pries~av~aeam
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` ~ / , ' ~ CQ NOT TO SCALE I i Plant LISt - 5~tormwater Wetland '
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- _ O~LOW SP I LLWa~IY DETA I L _ _ - - - 430 - TOP AI 1.50 NOT TO SCALE Oy~ TE .
430 $ -THE CONTRACTOR SHALL SEED AND MULCH ALL BARE AREAS NOT COVERED BT PLANT • MATERIAL AFTER CONSTRUCTION IS COMPLETE. SILT FENCE SHOULD REMAIN IN PLACE '
_ B UNTIL GRA55 HAS BECOPE ESTABLISHi~. ,
- ~ -SOIL DEPTH MI NIMJM SHALL BE 4'.
- - ~ - - OUTLET DEVICE INFORMATION
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dv 2' X 2' riser Hith on IB' RCP barrel 30 foot rip rap lined Secondary spillway
- - Normal Poal Elevation 410.00 Top of Water G>Jality Pool Elevation 411.50
Principal Spillway Elevation 411,50 ABSTRACT PRIEST, GRAVEN E ASSOCIATES, INC. LAUD USE CONSULTANTS
2 Tear Water Surtoce Elevation A11.01 This cent ____RETAININ6 ~ - 420 10 Tear Water Surface Elevation 413.06 This anal sis was conducted in order to comply with the City at Raleigh Stormwater management 3808'8 DRIVE, SUITE 104 y RALEIGH, N. C. 27609
WALL ~ r illws Elevation g13,Zp requiren 420 Seconds Y SP Y requirement of limiting the past development runoff to that which would have occurred under pre-development conditions during the two year design storm. HYDR0.0GIC DATA
~ ICD year Water Surface Elevation 413.79 pre-devt _ \ - - Top of Berm Elevation 414.50 SEAGROYES FARM
} CENTER STREET, APEX FILE NAME ~ SEAGROVESFARFiJ4.123 HYDR0.WIC ANALYSIS DRAINAGE POINT I - POST DEVELOPMENT DATE : NOV 21, 2005
~ Forebay Elevation g01,OD HTDROLO(
- TOP OF EL..•414.50 High Marsh Elevation 409.50 The rat] _ ~ 'y~~ Y Id Low Marsh Elevation 408.50 The rational formula was used to determine the expected peak discharges for each set of conditions. The WATERSHED LAND USE DATA time of concentration was determined using the Kirpich Equation, The storm hydrograph and the time to
I YR.WITER SURF EL.•413.80 Micro Pool Elevation 401.00 time of ~ peak of peak of the hydragraph were determined in accordance with the Small Watershed Hydrograph Formulation TRACT DESCRIPTION SOIL L, AREA
15.00 LF SPILL Y EL.•419.20 Method c - _ _ _ Water quolity pool drawdown orifice diam 2.0 in Method outlined in H. Raaney Molcom's 'Elements of Urban Stormwater Design'. NO ~OIJp AC.
3b-RE,f----- - - ~ I YR.FNT~SURF 9.,•413,20 Drawdown time from falling head orifice 2.6 days A 3.33x I Runoff ~ Runoff volumes were determined using the Sail Conservation Service methodology os outlined in NEH-4, I BUILDINGS AND STREETS B 98 0.95 4.69
I 2 YR.FNTER SURF E 9..•412.10 rv numbers were taken from standard values based on land use in accordance 2 LANDSCAPE AREAS B bl 0.35 6,03 Runoff coefficients and cu e 3 UNDISTURBED WOODED AREAS B 60 O.ZO 0,00
\ Runoff c - REV I'W CERTIFICATION BY THE TOWN OF APEX with cn~ 8' SS ~ with Chow, Malcom, and NEH-4.
- - 410 4 I 0 ~ NDRMU a. 410. a
Hydroloc rau s were determined based an the Wake Count Soil Surve and the soils information TOTALS AND CCMP051TE NUMBERS 77.2 0.61 10.72 Hydrologic soil q p Y Y contained in NEH-4.
- - - e d con to i nc This drawmg has been reviewed by the Town of Apex, and to the best of my knowledg an
uASS s - belied conforms to the requiremeNs established in the Standard Specifications of the Town of Ra i n f a 1 RIP-RAP 'Element Rainfall intensities were taken from National Weather Service data complied by Malcom in Exhibit 2 of TIME OF CONCENTRATION 'Elements of Urban Stormwater Design'.
t~IL-Efi- _ - - Apex. However, phis signature does not conatihite a variance fivm any requinmeme contained By TR-55 methodalogy, printout attached 0,19 HR
-P~4TE~uoN---- - ~ - an federal static or local code law cifieati iuk or ordinance. The develo erlen ' eer/ Topogral m y , ~ P Bm To o ra hic information used in determining drainage areas and hydraulic lengths was taken from the 11.4 MIN D 9 p City of Raleigh GIS data. RUNOFF AMOUNTS
D ¦13 ~ liCBble ~ City of contractor is solely responsible for meeting app rr.qunemen
- - -GGGT~(>~1N.I i I Ex 15 N6 Determine runoff volume from S, C, S. procedures
- BY~ PRIEST, PRIEST, CRAVEN E ASSOCI RTES, INC.
I - LAND USI --------v v - LAND USE CONSULTANTS linch storm 3808-B COhPl1TER DRIVE, SUITE 104 Rainfall 1.00 inches
(-224- 3809-B i RALE I GIi, - - - - 400 RACE I CFI, N.L. 27604 CN 77, 2
4OO ~ _ ~1' SOIL EROSION AND SE IlVIENTATION CONTROL HYDROLOGIC DATA From Buildings and Streets 13465 cf
m N - - - - CERTIFICATION BY THE TOWN OF APEX HrDRaa - - - - v n- L• 10, d SEAT RCNI SEAGROVES FARM From Landscape Area 278 cf
M a ~ ~ - CENTER ' CENTER STREET, APEX FILE NAPE SEAGROVESFARMD4,123 From Undisturbed Wooded Are 0 cf
- e Town of A and to the best of m knowled a and 1 NACI This drawing has bden reviewed by rn pex, Y 8 DRAINAGE POINT I - PRE DEVELOPMENT DATE : NCN 21, 2005 Average Runoff = 0.353 inches
- z z z N t l. 62x - - - belief, conforms to die requirements established in the Soil Erosion and Sedimentation Control wATERSM WATERSHED LAND USE DATA Total Runoff Volume = 13743 cf
- z D ~¦!i - Ordinance of the Town of Apex. However, this signature does not constitute a variance from T ~ a, TRAc TRACT DESCRIPTION SOIL C AREA 2 year storm
_ _ _ _ - - any requirements contained in any federal, state, or local code, law, specification, rule or No. _ - _ - ' eer/contractor is sole] re nsible for meetin all a licable N0. GROUP AC. 24 hour, 2 year rainfall 3.60 inches
- ordmauce. The developer/engm Y r~ g pp I GN 77,2 I ~J I LDI NGS AND STREETS B 98 0, 95 0.09
requirements. 2 2 CLEARED FIELDS, PASTURE B 69 0,35 7,06 Runoff = 1,518 inches
" THIS SIGNATURE DOES NOT CONSTITUTE PLAN APPROVAL, ONLY PLAN 3 . _ 390 3 ROW CROPS B 75 0.45 0,00 Runoff Volume = 59068 cf 4 UNDISTURBED WOODED AREAS B 60 0.20 3.55
Z ? RE UIREMENTS. A SEPARATE LETTER OF PLAN APPROVAL WILL BE MAILED 390 Q 10 year storm
_ _ TO THE FINANCIALLY RESPONSIBLE PERSON AT A LATER DATE ACCORDING TornLS TOTALS AND COMPOSITE NUMBERS b6.3 0,31 10.70 24 hour, 10 year rainfall 5.38 inches CN 77.2 ppNw,,,.
TO THE CONS UCTION SEQUENCE. _ ~ ,C, RO '~i
- TIME OF 0.C CENTRATION RunofF - 2.96 inches c~~, 4i TIME ON Runoff Volume = 115236 cf 0 ''~~~~d~ 0 9
- - By: Date• By TR-55 methodalogy, printout attached 0.3 HR
18,0 MIN '
S$ DETERMINE THE ANTICIPATED STORAGE V0.UME5 ~ ti ' _ RUNOFF AMOUNTS •
_ _ REVIEW CERTIFICATION BY THE TOWN OF APEX RUNOFF ~r Water 0uolit re uirements mandate control of the '0 , Y q i~
- - - PUBLIC WORKS AND UTILITIES - Determi Determine runoff volume from S.C.S. procedures runoff from the I inch storm. 13743 cf Q i~
q Y ME Town of Apex CYdinances
- - 380 This drawing has been reviewed by the Town of Apex Public Works and Utilities Department 2 year 2 year storm mandate control of the 2 and 10 year sto 37083 cf 111~~1~11'/
380 and to the best of my knowledge and belief, conforms to the requirements established m the 24 hour, 2 year ra i of a I I 3, b0 inches ,aa ll~ll' GN bb. 3 AT I ONS a ~ CA RD ~i EXTENDED DETENTION WETLANDS SIZING CALCUL
- - - Standard Specificat~nns and Construction Deta(ls and the Unified Development Ordinance of the J Q~ ~i ~
Town of A x. However, this sl does not constitute a variance from any requirements l~ Runoff = 0,869 inches t no on wetlands to treat the runoff from the site, ~ ~ Q~~~ ~ - 7 9 cf Size an extended de e ~ y
_ _ contained in an federal state or local code law ificatio rule or ordinance. The - Y ? ~ 4 Runoff Volume 33 2 t SAL Normal pool depth 3 fee
develo len ' eer! contractor is sole] re `ibis for meetin all licable uirements. l o year 10 year storm Impervious cover percentage of the tract 0.44 ~ ~ ~ 56
P~' gm Y g aPP rep 7d tin,ir 10 vear rainfal I 5.38 inches S,r4nio Aron to f)-ninnne Aren Rntin 1.86 ~ 1~
GN _ 66 3 ~y E
0+00 1+00 2+00 3+00 4+00 I Br: Date: Required Surface Area 0.20 ac yip
F Q 2.01 inches 8686 sf ~ Runoff 8 Runoff Volume = 78153 cf Surface Area Provided 9800 5f IINIIIg1~
' • 9INC op LE PRIEST CRAvEN & ASSOCIATES 55
SEAGROVE'S FARM AS 5"°" PLAN E PROF ILE 771 ~VI SED
LMD LAND USE CONSULTANTS PLANNERS I LANDSCAPE DESIGNERS / SURVEYORS / ENGINEERS
3803 - B Computer Drive, Suite 104 Raleigh, N.C. 27609. Phone [phone]. Fax [phone]. Email [e-mail] 421
F 51 NGLE F11M1 LY ! TOWNHOUSE sUW I V I s. ON DATE: DECEMBER 1, 200 EXTEN b DETENT ION WETLMD ILELIA S. WOMBLE GHR I ThBLE TRUST APEX, NORTH CAROL I NA PROJECT: 2002-024. 001 PRELIMINARY NOT-RELEASED FOR CONSTRUCTION

~ I I I 410 I
` ~ ~..n ~ I I I I I I ~ 2 X 2. -YARf7 I N ET v\ I ~ I I LOPE51 1 \i \ I I 3 ~ I O ZI ZAN I A AGNIAT I GA- U
~ ~ I I / p ~ I ~ ~ I 1 I W/ ~~ASH RACK I I HANDwIiEEI. ~ ~ ~ I m I I ~ I 41U I 7
. 0 I+ i r ~ ~ MI CHILL, EC~MO D J RESaR ~tl ~1 / ~ STD N0.5.02 1 . I H ~ P I N~NUM` 07521 10 0 I N`i~fI1AEA ODORATA 5 \ I I i i I i ~ ~ , ~ I I I ~
~ I Z0~11 I T I DEE BdOK: 2815 I R ~ N - MERGENG SP I ULI(JAY PAN I GU V I R6ATU1'~ 1~3 / I I 1 ~
: 191 I TRAStI RAq( DEE P GE p 3 ' I I+ I I I _ i ~ O ' 1 I I ~ IRIS IR6INIGA- I Pq~TED~21A TM745 ~ I ,
i DES ~ m + I t ~ 5 ~ I I I I I ~ CANNA FLALGIDA- I ;
I P I V TE ~ ~ I I I I I I t- t 1 _ I I s I I , j I I ~ I
' D A I AGE ~ ~ --~---r-~- I c0 I I ~ _ I I I ~ ~ ~ I I I ~ ~ ~ ~ p I I 1 1 I
~ ~ ESE EN I I o i I I I- ~ I ~I I ; H I S I~11 248, I I • ' ""P ~ I i
i I I ? I L r ~ d' I AFL i 5 I I I i HYhFN LIS GAROLINI A-121 "1 I I + I -238
I I .ry t T OF RM L• =41'9. SQ I _ Q ° ~ ? a • I I I PE~TjAN VI R,GI N GA SA6ITARIA L~TIFOLI M 35 I I i `
1 ~ I ° BIFL I I I , JUNGUS OR11,5- ,
I I I f 1 i - . I I ' ~ I I I I j ~ i , i I
1 I t I a I ~ , ~ i
1 1 M I f~i H S~ t MARS , I 1 I I I ~ I I a A~
1 1 ? I ~ t EL.=,412. ~0, 1 I 1 1 1 1 I I I °
1 1 MIGR0IPOQL~ t LOW ~ I I a 1 1 1 I I ~OREBIAK 1 WATER 0uwrr oPoFICE j 1 144 F ~ I JU BI FLAd15-64 ~ so{iat~'r .
1 1 1 1~ } 3603 SF I SF I 1 I s I L=40.00. _ a I I ~ ' SGI 5 PUN6EN5-2(i0 .I i 1 I r
EL. -412. E . glaf o0 1 1 I I \ i. ~ 1 I I T F r~:
} 1 I I I I 1 1 1 I ° 1 1 1 I I I ~ 1 I I d. I j 1
~ I 1 lF 1 INVERTED PVC RUS;LERNUUS-17 I ~ c. I
I 1 t i I I I a 1 2. I I I • ~ 9PHON PIPE OUTIET PIPE I 1 1 I ~ 32, I I I I l ti - H AIrL I S CAROL I ANM53
SLO~'ES I i ° 1 ,1 1 1 I I I I 1 ~ I ~ ~ ::a~ia:~ 4'sa;ti~ Sflu1 RUS ~GERNUUS-40
l 10 IX 2 1 I ~ I I 1 I ~ I I I 1 I 1 PS.J 'VIR6INIGA-2 IA G~ SAGI TART AA LAT I Fq.
1 I TOW 0 TAPE I a I I I ~ ~ I ~i I :d. - _ ~ I I ~l IN ODORIITA 3 JUN 5 BI~LORUb-83
1 I 1 r I 7 I I 1 I T T I~ T Y 1 I 1 i I 4 PIUC VALVE d a i I I ERA I'~~~~~ ~ ZIZAN ~AQJATIGA-4 , I ~ I i
1 1 I. ~ a ~ 1 1 i ,.L. I I 1 .l - I ~
~ ~ ~I I I i i SAWRUILIS ' 32 r ~ I I I
I ~ \ 1 1
1 i I ° I ~I .._...-r.. . j J , . . I i 1 ~ 1 ~ ~ ~ I
1 I I.• ° a I 49+ i X48+00 ~ P I ° d ~ HTF@Im(.Nl I I N l,M1A-~85 i, r ~ i ~I I 1 1 ~ i I i I
~ 1 I. 1 i I I I 1 I ( • ' } ~ ~ \ \ 2 LF OF a'DIP 0 INVERT I ~ ' - ~ ~ ~ I ;
•I' 1 y' ~ \ -•-•1 I• I I ,r,~ , \ ~ I I i ~ i ~ 1 + ~
I ~ ~ a I _ HC 2 X 2 YARD INLET W/ TRhSH RACK • 'I~ ~ SA61 ARIA LATIPnLU-74 I ~ I I ~ t ~ I Rk5 V I RGI Ind GA-56 I ~y`L ~ ~ ~ ~ D~
I 6 I ~T \ - I ! I 24 ~ I 5 ANDARD DETAIL 5.02 ~ ~ I •I' I ~ t ~ I ~ ~ u~ - - ~
I GI# 3 T I ~ I _ \ ~ ~ I I 6 / I I ~ FOR'INVERTS AND ELEVATIONS SEE PROF~E THIS SHEET I I I ~ I - ~ I~ ~ ' I I I f CJINNA FLAGGI DA 3 I i
4' b I I I m•••f•• I NOT TO SCALE 4 1\ i ~ I ~6 I ~ _ - -t
I I I l~ ~ \ I I t ~ I I' ~ I I I ? rlfi#44 ~ I I I I I -I I 1 ~I ~ I / ~ I I - - = ~
I I ~ ~B ~ ~ ~ I 1
1 • I I I \ 1 I I - ~ I ~ cfJ \ / I I I ~ I ~ I
I I 111 l I\ I ~ ~ 1 I 'JO' - M'IDO . ~i' I, i\ I I ! I I i r ~ 9 ~ I •I I O \ I I I I ~
~ I I I I l l I v i~ ~ J 1
L J I - ale~oo
r ,i ~ ~ ~ '
RIP-RAP Plant Llst • 5tormwater Wetland
~ ca..?nr lIMM/Nlwr ~..y...
to ~ RACUa? QroLCe+t:ANU, ~ ~ r~ct/+ vwe+rnN vrnttetueb r D o ~ i ; ~ "s
_ OVERFLOW 5P I LLWAY DETAIL 707 NIhD10GAt1MJ GAAOL/INM ~PIOEI LlT la' { I_,~} c. 3 ~ ~ L'~
- - a. x ~ Y I Ia.ET NOT TO 5CA ~ _ LE OLlR PLAD R16 414 IWS VMI61iGA la'
- 312 sls •larua axt.o~rs et+ota tttletr r c f' ~ L 0 ~ 5
- - a TOP-414,50 a Nr~w~eA Ot70RATA ~tArantr w?lel ur ? gee f~Twpu?vwwcA NaorlA~+ ~ Ltitr~r ;i'~,rE=.~.~:~Lrrv
~ ~s - - - CUTLET DEVICE INFORMATIGN 19A 746 lGNt[37~INLO6pATA t~IGKL~.14® `a°aElf.l~hiri;~irv~Tiif~fs°`f'i;4ff:~Bf'~iK
,qq sAaflrAta utrau ela~ar~?r Aiaa~eAO ~
~ sAtl~wt~ cenw IIbNDf TAB r
- 2' X 2' riser w i th a 24' RLP Barre I !!9 - - . . _ 30 foot rip rap I i ned secondary sp i I I way y~ ~cwu n~ n~~awe ~ fr
- - ~ >r - - - 4~ boo ar~IM AaM11GA uaa t~C4: NY NOTE;
4 Normal Pool Elevation 413.00 NOTE; ~ n ~ Top of Water Quality Pool Elevation 414.50 -THE ~ _ _ MATEF -THE L~iTRALTOR Srti. 5FE^ AN.^, ~LICN k! BARE AREAS NOT COVERED Br PLANT
- Principal Spillway Elevation 414.50 UNTIL MATERIAL AFTER CUK?p,~'!~~ 5 ;.RPIETE SLIT FENCE SFIOl1L0 RElNIN IN PLACE UNTIL GRI55 HAS BECOhE ESiABl15rED.
~ ~ - - 2 Tear Water Surfact Elevation 415, 13 -SOIL DEPTH MINIMJM SMALL BE 4 .
v ~ v - 10 Tear Water Surface Elr,r.' 415.99 -SOIL N N Emergency Spillway Elevation 416.00
- - N -g_ _ _ ~ ` ~ ~ 100 year Water Surface Elevation 416.62 - ~ Top of Berm Elevation 41.50
~ ~ AP.S'Qti '
' Forebay Elevation 410.00 Hi qh Marsh EI evat i on 412, 50 a+'ES? CRAVEN t ASSOCIATES, INC. ?r,,ti ana vs s cona.,"red .n order ro camaiy with The City of Raleigh stormwater managemenr LAND u5E CONSULTANTS
" - - - Low Marsh Elevation 411,50 reCu~•ewe•+r or ' r.,r~^q +we vos+ de.e'op+nenr runoff to that which would have occurred under 3808.9 LC~fUTER DRIVE, SUITE 104
_ _ Micro Paal levatlan 410.00 pre-dr.e opa^' co•+9 +.a^z d~rinq r^e '»o vcor des qn shorn. RALEICf+ N. C. 27609
- - - - - - - _ - 420 - - - Water quality pace raw own on ice dram in HYDR0.0G C DATA Nrt7oA_Ca N.q f 5' S SEAGkwE' FARM
420 Dr-awdown time from falling head or~+ice 2.8 days CEN'Fv STREET, APEX FILE NAhf ; SEAGROVESFARMD4.123
- -ltd t The rqr.^^c +a'+xu~a »as uxd •r, ae•cr~~ne rwt erpecred peak discharges for each zee or c^nd ' ans, The DpA ar~GE POINT b - POST DEVELOPMENT DATE : NOV 21, 2005 Y~nt of "once^'•a•~on »ar derv+. neC u•inq the C:.irpich Equation. The storm hydrogroph aid rime ha
peo+e o+ •^e ''rdrogrovh »ve derene ned .n accoroance with the Small Watershed Hydrogroch 4ar~:'otion w''ERSHED LAND USE DATA ttr'+ad ned ~n ~ Rooney `b'ce.'e 'E~cKnts of Urban Stormwoter Design',
~ I YR. WATER SURF Et. •a1b.01 - - SPI Y E~.¦aIb.00 TvKT DESCRIPTION SOIL C. AREA Runot+ .o'.,~r+ »ert determined .,y,n~ the 5c.! Conservation Service methodology as ou• ^r' ' `.EH-4, N0. GROUP AC.
e' ss ` ~ ~ WATER suRF e.. ¦a 15. I ~ REVIEW CERTIFICATION BY TSE TOWN OF APEX
Runa~' c-:r++ rnrs and curve numDrrs »ere 'r,1r^ rrnm standard values based an land ,:•.r s;-.::rdance I BUILDINGS AND STREETS B 98 0.95 5,49 '1t',^~. and HEH-4 2 LANDSCAPE AREAS B 61 0.35 8.24
3 UNDISTURBED WOODED AREAS B 60 0.20 0.55 ~ Ffydra~aac s~^ groups »ere deters arc tars an +ne +~rt County Soil Survey and 'h! a °'r•mation
- - ~ ~ NORMAL •a 13.OD This drawing has been reviewed by the Town of Apex, and to the best of my knowledge and conta~nea .n vf++-4, TOTALS AND CCPPOSITE NUh6ER5 75.2 0.57 14,28
belie; conforms to the r in Standard Specifications of the Town of town of Rainfall ~nrensities were taken t.o* •rar~~na, Nr.^,'~er Service data complied b, 't „n ~ + 2 of
- Apex. However, dLis signature does not constitute a variance any requir~ta contained - _ _ - _ _ _ 4 I Q t~ or local code law ' cati rule or otdinar?ce. The dove !en 'near/ 'Elements o' l>•bon Starmwoter fke~Cn' ?~r£ OF CONCENTRATION
- m any fi~eral, ata , , spectfi on, ~ 410 71eng~neerl Topograpw c nlormation used in Jere+, n~nq t•o ^aqe areas and h draulic lens" + •:"n- the TR-55 methodolo rintout attached 0.17 HR
21, 00 L contractor is solely responsible for meeting all applicable requitements. G ry o! pale qh 615 data. Y ~ 9Y P 10.2 MIN
! I . I I z ~ LF RINOFF M~YUNTS
- - - - - - - - 1ST I n6 - By: 2 DI l 2124' _ _ PRiES? RA .?'.4 t ASSOCIATES, INC. Determine runoff volume from S.G.S. procedures
ALI I- - _ . LAND G'~ (.CN`a11?ANTS 3806.8 ~'!'ER DRIVE, SUITE 104 •nch storm
RAtE~C+' N.. 27609 Rainfall I. CO inches LN 75.2
SOIL EROSION AND SEDIl1'IENTATION CONTROL B ' - _ _ CERTIFICATION BY THE TOWN OF APEX HYCR:7:L<: ~A.~;-+,t• r.p+. From Buildings and Streets 15762 cf
LF- - - - CEr+'tu ''v!?' APEx FILE NAAE : SEAfoRDJESFAf?rtj From Landscape Area 380 cf
- - ! 0.50E STpJE GLASS 6 _ _ _ j - . D4A +rk# b - PRE DEVELOPMENT DATE NOV. 21, 2005 From Undisturbed Wooded Are 35 cf
- This drawing has be' reviewed by the Town of Apex, and to the best of my knowledge and _ D 13' S0 ;e and ,~'t~.."" . t,SE DATA Average Runoff = 0.312 inches
- - - - - - _ _ -iro - - - D~TH¦22• belief, conforms to tike requirements established in the Soil Erosion and Sedimentation Control 400 l COIltIOI Tota I Runof f Vo I ume 16171 cf 'v+~'.' ;~'~_v uT I ON 501 L C. .
Ordinance of the Tawn of Aped. However, this signature does sot constitute a variance from O N :e from ` C~tQJP : that storm 24 hour, 2 year rainfall 3.60 inches
- - ~ - ~ - - any requirements contained in any federal, state, or local code, law, specification, rule or OI f1 ,~~NG$ AND STREETS B 98 0.95 CN 75,2
_ - ° - ~ ordinance. The developer/engineerlcontractor iasolelyresponsible for meeting all applicable - ~ Q M _ 1-' - - . _ - _ _ _ _ requu'ements. 1 3 le ~ r~+~D FIELDS, PASTURE B 69 0, 35 ^ j C b ' w~ CROPS B 75 0.45 r Runoff 1,385 inches
_ ~ ~ ,'"~:'"_~'URBED WOODED AREAS B 60 0.20 I < + ~ Runof f Vo l ume = 71798 cf
' ~ THIS SIGNATURE DOES NOT CONSTITUTE PLAN APfltOVAL, ONLY PLAN Z z z z t~ "`4' :t*POSITE NUh1BER5 60.9 0.22 15 `r .rnr storm 24 hour, 10 year rainfall 5.38 inches
- - - - REQUIREMENTS. A SEPARATE LETTER OF PLAN AttROVAL WILL BE MAILED MAILED cN 75.2
TO THE FINANCIALLY RESPONSIBLE PERSON AT A LATER DATE ACCORDING DRDING ' ' . ENTRATI ON Runoff = 2,18 inches a~~~ _ ~`t,, CAR ~i
_ _ - - - TO THE CONS UCTION SEQUENCE. •a 55 methodology, printout at av~ca 0.06 HR Runoff Volume 143986 cf ~ •`.``"inur,,Q~~~ 4.8 MIN ND qp •,,~i
- - Y - - - - - - - - g Date: R~''i't •>rin,•~. •tV 9'
- - - - 390 f 'Eo•+~ NE THE REGU I RED STORAGE VOLUME ~ . W ~ x. ;r'+•. •r • ..,~t volume from S.C.S. procedures Water 6iality requirements mandate control of the
X90 runoff from the I inch storm. 16117 cf vy ~
- - - - - REVIEW CERTIFICATION BY THE TOWN OF APEX ~ E ' rrr 4' r~ ~ O ~ Q
- . PUBLIC WORKS AND UTILTfIE5 v """v 24 hour, 2 year rainfo!! 3 b0 inches Town of Pgex ,Ordinances mandate control of the 2 and IO~year zta 54047 cf Q
cN f~0.9 ~ ~P qY M ~
f ' T+~'~D OEIENTI ON WETLANDS 51 Z I NG CALCULATIONS IIIIIIII~ Runoff 0 bed inches Runoff Volume )~bia ct ' ;r ,n extended detention wetlands to treat the runoff from the site. ~~pNlllp
- - - - ~ This drawing has been reviewed by the Town of Apex Public Works and Utilities Department a~' ~~n
and to the best of m' knowle a and belief, conforms to the eats established in the - _ _ Y d8 ~m in the - .ra• ~ FARO 24 hour, 10 year taints! ~ 5 ;6 inches formal pool depth 3 feet 1
Standard Specifications and Construction Details and the Unified Development Ordinance of the impervious cover ercrntage of the trod 0.38 S ~ ~ nice of the cN rx a P ~ Surface Arto to fkainoge Area Ratio 1.65 ~ ~ ~
- Town of Apex. However, this stgmdue sot constitute a variance from any rogtarenteats _ - - caatiixdm any federal, state, or kcal code, law, specification, ntle or ordinance. The ~tnCnt<4 Runoff a0 inches ~
' Runoff Volume "°i439 cf Required Surface hea 0.24 do L " 10264 sf
~ - drvrlnw/'noinrrr/ enntrartnr is Rekly t+~afcrosihle fnr m~tino dl annlica6le errn?irnMntc MnM Surface Area Provided 10275 s{ i 1 106 ~
60 A0 15 0 i`
100 50 25 0 50 100 •601
0+00 1+00 2+00 3+00 4+00 8,.: Date: ~~VIP
GRAPHIC SCp:_ GRAPHIC 5CA E
REVISED ¦
¦
5EAGROVE ' S FARM 5G"`E '5 PLAN 4 PROF: ILE ¦ 11 RIESTCRAvEN & AsSOCIATES,INC, of=
ND P014D # 6 - LAND USE CONSULTANTS PLANNERS / LANDSCAPE DESIGNERS / SURVEYORS / ENGINEERS 3803 - B Computer Drive, Suite 104 Raleigh, N.C. 27609. Phone 919 / 781-0300. Fax 919 / 782-1288. Email [e-mail] 422]
F 51 NGLE PAM I LY ! TOWNHOUSE SUBDIVISION DATE: DECEMBER 1, 2°05 EXTENDED DETENTION WETLEAND Pi ILEL IA 5. WOMBLE GHRITABLE TRUST APEX, NORTH CAROLINA PROJECT: 2002-024.001
PRELIMINARY NOT-RELEASED FOR CONSTRUCTION

~ i ~ 135
~ ~ ~ .I r ~ i , . ~ ~ ~ F0~-BAY ,
~ ~ ~ ~ ~ _ - ~~0 SF
I ~ i ~ ~ ~ 1
~ i ~ ~ - ~ ~ ~ I . ; ~ _ ~ - EL. =4 17.00 ~ 1 , ~ ~ ~ \ ~ HANDNMEEI ~ i 1
~ C 6 ~ ~ ~ HIGH MARSH / ~ i I ~ '
~ • I FES#62 J~400 ~ ~ ~ ~ TRASH RACK SH RACK
I \ I I ~ EL. =419.50 \ ~ ~ I q.
\ ~ ~ _ LOW MARSH ~ 1
~ ~ - ~ I _ ~7 ~ \ ~ ! I ~ 't400 SF i •
~ ~ g III , ~ + I I I ti EL. =4 19, 00 . JUNCOS BIFLORllS-127
I I ~ ~ I I I , ' SIUIRUI~15 GERNUUS-71
~ I / - ,i - , r ~ 2 YARD INLET ~ ~ i v CANNA FLACGIDM3 '
ub ~ I I ~ W/ TRASH RACK a I I / - i
~ 1 I. I I i - STD. N0.5.02 a ry . I ~ - ~ \ I i I I
(
l I I ~ POOL I I I MICRO a MH# I
I 600 5 a I~ I ~ . I I I _ a • 0 ! 0 X20 -
I I -4 7 WATER ouAUTY oRIFlCE ~ a
I ~ II t v - L ~W SAGITARIA LATIFOLIA-53 CANNA FLAGGIDA-3
GI A , • I ~ / MARSH HYNE~IOLALI 15 CAfiOL I N I MIA- 121 PELTANDRA VIR6INICA-85 SCIRPUS PUN6ENS-31 i
I. ~ ~ IRIS VIR61NiGA-24 ZIZANIA KUATIGA-301
~ I A FLACCIDA-4 ~ CANN ~
I " ~ ~ 1 ~ ` 1 LF 1" INVERTED PVC I~ I ~ ~ ~ ~ P v PANICUM VIRGATUM-115
I ~ ~ \ RETAINING WALL ~'H0N I I ~ a F0RE8AY
I ~ OUTLET PIPE
l~ l I I I I I TOP OF BERM I I I v H~ ~I _
1 0 ~I • I I EL. =424, 50 i I I ~ 4 PLll6 VALVE 4 v MASH . ~3
f j I J I \ ~ ' I 0
I. ~ ~ ~ \ #68 a ~ ~ ' ' \ a . '
~ ~ ~I ~ a a fANA-104 ~ HYhEN0CALL15 CAr~LIN ~
s~. ~ \ PMIILUM VIR6ATUM-93 /
\ \ ~ ~ ~ 3: I ~ ~ \ 2 lF OF 4"DIP 0 MVERT ~ \ , \ SA6ITARIA LATIFOI.lA--107 ' ~ ~ 191~~
_ T \ , \ \ • \ ~ \ ~ ~ RACK r §ri'- IJ~ i~ ' # -..I
\ 2 X 2 YARD INLET W/ TRASH \ ~ 6RA
\ STANDARD DETAIL 5.01 • \ \ ` ~ ~ EASNT \ ii " AURIJRUS CF~JUUS-97
• ~ \ I a FOR INVERTS AND ELEVATIONS SEE PROFlLE THIS SHEET ~ ~ ' ~ \ \ ~ ~ \ \ \ NOT TO SCALE N'(hPHAEA ODORATA-5 ~f+ ~i ~i~r' ~'k U ufg
• / ~ \ ~ \ ~ ~P1 tLWAY \ \ PaNTEDERIA GORDATA-23B
~ ~ \ ~
RI VIRb 9 CANNA FLAGGIDA-4 ( PUN ~ ZIZANIA ApJATICA-249
rora wa - - 4450 J CUS IFL 48 PELTANDRA VIR61NIC1~ 43
N 1 N 1 ~ I 9p' - 44.50 SA6ITARIA LATIFQLIA-7b q3~
~ ~ L_ J - 423 - 42350
3 ~ Plant Llst - Stormwater Wetland
/ PRIVATE ~ °'°`"9°6'
_ RIP RAP P µ DA 601.DEN GAML1 9'
EMERGENCY DRAI NA6E PAl1GMVIRPJAIUM awrcNORA~s 9'
EASEMENT ~ RYrsROU~L~cAROLINw+~ ~vueRLLLY 18' SPILLWAY ~ ~~IR ~~,R,S ,e.
_ _ - - OVERFLOW SPILLWAY DETAI L ' F In ,uNCVt eKLOwus ~ 2'
NOT TO SCALE S NY~PIi4lA OOORATA HtA6RNR ?WTBi LILY 3'
- I~ PC.TANDRA VP611K,i1 ARROW ARUM 19" 298 PONflDlRU1GORDATA PIGKEia W°J9
~ 9MIITARN IAf~GIIA ERLNDLfX ARNOPIEAD IE'
- - _ - CUTLET DEVICE INFORMATION - - - ri - _ m - - w ~wMrcwm~ rreA~osrAl~ 2'
- 2' X 2' riser with a 12' RCP barrel and b' restrictor ~trictor N ~~t,1MlN1
- ~ 30 foot rip rap lined secondary spillway 440 ~ V 21iAMA AGWTiGA ?i.D RICB IM
H ~ _ Normal Pool Elevation 420.00 aO~ThiTE CONTRACTOR SHALL SEED AND ~"i1LCN ALL 9ARE AREAS "1nT !~rVEvED B! Fn-°~i'~ jQ MATERIAL AFTER CONSTRUCTIgv IS COfi'LETE. SILT FEH~t _n.~,~"; R~MA,'~ ~'i
- n - Top of Water Quality Poal Elevation 421.50 t _ UNTIL GRASS HAS BECOME ESTAELISHED.
- Q 7 ~t YARD INLET Principal Spillway Elevation 421.50 - v Y J - 2 Tear Water Surface Elevation 421.80 -SOIL DEPTH MINIfi1M SHN.L BE 4'.
~ - - - 10 Tear Water Surface Elevation 423.60 - - Secondary Spillway Elevation 423.50 ~ ABSTRACT PRIEST, CRAVBI t ASSOCI RTES, INC. i0 LAND USE GaNSULiANTS
~ TOP¦421 50 100 year Water Surface Elevation 423.96 36 This analysis was conducted in order to comply with the City of Rpleigh Stormwater management ~_g Cp{+U~ ~IyE, SUITE 104
Top of Berm Elevation 424.50 j0 requirement of limiting the past development runoff fa that which would have occurred under RALEIGH, N. C. 21609 pre-development conditions during the two year design storm.
- - - - -g 4 17.00 - - Forebay Elevation ~ HYDROLOGIC DATA SEAGROVES FARM
- r Hiqh Marsh Elevation 419.50 ~ P Low Marsh Elevation 418.50 ~Q HTDR0.0GIC MlALT515 CENTER STREET, APEX FILE NAME : SEAGROVESFARMD4,1 jQ DRAINAGE POINT 8 - POST DEVELOPMENT DATE : NOV 21, 2005
- _ . Micro Pool Elevation 417.00 r ~ _~_-i ~ ~ The rational formula was used to determine the expected peak discharges for each set of conditions, The
- . 430 430 i ~ m I.0 i n time of concentration was determined usinq the Kirpich Equation. The storm hydrograph and the time to NATERSHED LAND USE DATA Q in peak of the hydrograph were determined in accordance with the Small Watershed Hydragraph Formulation
Water quality pool drawdown orif ce dio growdown time from f a l l i nq head orifice 4.3 days 3 da 5 Method outlined in H, Rooney Malcom's 'Elements of Urban Stormwater Design', TRACT DESCRIPTION SOIL C. AR Y N0. GRGUP
Runoff volumes were determined usinq the Soil Conservation Service methodology as outlined in NEH-4. I BUILDINGS AND STREETS B 98 0,95 1.81
- _ LF I < 27, 00 - Runoff coefficients and curve numbers were token from standard values based an land use in accordance 2 LANDSCAPE AREAS B bl 0.35 3.29
- -i~-REP--- - - - ~ with Chow, Malcom, and NEH-4. 3 UNDISTURBED WOODED AREAS B 60 0,20 O, CO
_ e a 74x _ _ ---fioP--aF- RM-EL.~t3~. REVIEW CERTII~ICATION BY THE TOWN OF APEX - Hydrologic sail groups were determined based an the lake County Soil Survey and the soils information TOTALS AND COMPOSITE NUMBERS 74.1 0 56 5.10 contained in NEH-4.
8' ML -EL. ¦ .
- - - - I T H.. ¦a23, 00 This drawing has been reviewed by the Town of Apex, and to the best of my knowledge and s ~ E and Rainfall intensities were taken from Notional Weather Service data complied by Malcom in Exhibit 2 of TIME OF CONCENTRATION g 'Elements of Urban Stormwater [ksign'.
, belief, conforms to the requirements; established in the Standard Specifications of the Town o 1'0Wn Of BY TR-55 methodology, printout attached 0.21 HR Topographic intormatian used in determining drainage areas and hydraulic lengths was taken from the 12.6 MIN
EXISTING 4 ~F - - - Apex. However, this signatun does not constitute a variance from any requirements contained ;Ontamed City of Raleigh 615 data.
- - - - - 420 in any federal, state, or local code, lbw, specification, rule or ordinance. The developer engineer ;rkngmeCfl RUNOFF AMOUNTS
420 - - ~ NoRTw. EL. •420.00 ' le for ' all livable uiremmts. contractor rs solely respons>Ib npeeting app req Determine runoff volume from S.C.S. procedures PRIEST, GRAVEN E ASSOCI RTES, INC.
LAND USE CONSULTANTS linch storm
gy; Date: 38~-B C01•PUTER DRIVE, SUITE 104 Rainfall 1,00 inches RALEIGH, N, C. 27609 CN 74. I
- - - - - --r-- HYDROLOGIC DATA From Buildings and Streets 5196 cf
- - - - SEAGR0JE5 FARM From Landscape Area 152 cf CENTER STREET, APEX FILE NAhE SEAGROVESFARhD4.l From Undisturbed Wooded Are 0 cf
I' DI A. SOIL EROSION AND SEDIMENTATION CONTROL GRAINAGE POINT B - PRE DEVELOPMENT DATE NOV. 21, 2005 Average Runoff 0.289 inches
g \ CERTIFICATION BY THE TOWN OF APEX WATERSHED LM1D USE DATA Total Runoff Volume = 5348 cf
~ n RI -RM - - - - , r I TRACT DESCRIPTI W SOIL C. AR 2 year storm
_ _ - ; ~ _ ~ - - - - - - - ~ - This drawin has bejen reviewed by the Town of Apex, and to the best of my knowledge and - _ 3- ~ g GROUP ge and N0. 24 hour, 2 year rainfall 3. b0 inches
- belief, conforms to tike requirements established in the Soil Erosion and Sedimentation Control . . - ~ ¦ 13' i - 410 i Control =_________________`___°__°_°--____°____'_________=-°==8 ===0=-~-_J°====o=~ CN 74.1 I BJILDIN65 AND STREETS
~ ~ H¦2z 410 - - Ordinance of the Town of Apex. However, this signature does not constitute a variance from ce from 2 CLEARED FIELDS, PASTURE B 69 0.35 0.00 Runoff = 1.318 inches 3 RGW CRGf 5 B 75 0.45 0.00 Runoff Volume - 24394 cf
_ _ _ _ _ ' - an re uirements contained in any federal, state, or local code, law, specification, rule or Y q ~Or 4 UNDISTURBED W0O[:ED AREAS B 60 0.20 4.23
~ _ _ - ordinance. The developer/engineer/contractor is solely responsible for meeting all applicable licable to year Storm P TOTALS AND COMPOSITE NUMBERS 60.0 0.20 4.23 24 hour, 10 year rainfall 5.38 inches CN 74. 1
_ requirements. ~ -
8" ~ _ ~ _ TBIS 51GNATURE DOES NOT CONSTITUTE PLAN APPROVAL, ONLY PLAN AN TIME OF CGNCENTRATION Runoff = 2.68 inches
REQUIREMENTS. A SEPARATE LETTER OF PLAN APPROVAL WILL BE MAILED bIAILF.D 0.25 HR Runof f Vo lume 49bb4 cf BY TR-55 methodology, printout attached ~1~11H111//~ ORDING I s. o MIN a~ CA ~'y
_ 12? Z~' _ _ TO THE FINANCi~ALLY RESPONSIBLE PERSON AT A LATER DATE ACCORDING DETERMINE THE ANTICIPATED STORAGE VOLUhES ` ~"p" RUNOFF AMOUNTS ~ Q•` tr
TO THE CONSTAIUCTION SEQUENCE. Water GUality requirements mandate control of the ; ,~Q F
~LLAR Date: - - - - By; _ , Determine runoff volume from S. G S. procedures runoff from the I inch storm. 5348 cf ~j .j
V J - 400 Town of ex Ordinances = - 158 ~ 2 year storm mandate control of the 2 and 10 year sto 26194 cf x ~ ; T%J~
- 400 - 24 hour, 2 year rainfall 3.60 inches ~,S ~ , ~ = O
Z RIGP 6 - - - _ - - - ¦ I - REVIEW CERTIFICATION BY THE TOWN OF APEX CN 60.0 EXTENCED DETENTION fBTLANDS SIZING CALOJLATIONS ~~A
a ~ L Od - ~ PUBLIC WORKS AND UTILITIES Runoff 0.515 inches Site on extended detention wetlands to treat the runoff Pram the srte, ~ ~ P' = I f ~9' q Y M~ Runoff Volume 8B3 c
- - p~'_ Normal pool depth 3 feet 10 year storm Impervious cover percentage of the tract 0.35 %
- z z 5T0NE - B-._._..._._------------- . fiu1411ent 24 hour, 10 year rainfall 5.3B inches Surface Area to Drainage Area Ratio 1.53 ~ O ,111111111111p11y~~
- ' p This drawing has been reviewed by the Town of Apex Public Works and Utilities Department - z ~o 0, CB oc ~ CARp R~~i ~ t]le Required Surface Areo
~a. and to the best of my knowledge and belief, conforms to the requirements established iA the Runoff 1.53 inches 3399 sf ~ /j/ annceofthe Runoff Volume 23470 cf Surface Area Provided 4000 sf , ~ 9
- Standard Specifications and Construction Details and the Unified Development Ordinance of the a - Town of Apex. However, this signature does not constitute a variance from any requirements .cements
- - le
' contained in an federal state or local code, law, s i~cation, rule or ordinance. The Z Y , 60 30 15 0 30 f~0 100 50 25 0 50 100 ~ ~ rJ6
- develo /en ' eerl contractor is solely responsible for meeting all applicable requirements, - 390 per gm I menu,
390 _ _ _ ,~~iy i. _ aJ
0'1'00 1t00 2t00 3+00 4t00 I I By: ! Date: 1j1j111~~\~~ GRAPHIC SCALE GRAPHIC SCALE /y~1S F.
SEAGROVEI S FARM ~`"`E: "5 5H0"" PLAN E PROF: ILE LE REVISED PRIEST CRAvEN & i ASSOCIATESINC, 9 OF
LANDSCAPE DESIGNERS I SURVEYORS 1 ENGINEERS 42 D USE CONSULTANTS PLANNERS
LMD POND # 8 LAN1567 1 803 . Email [e-mail] - B Computer Drive Suite 104 Raleigh, N.C. 27609. Phone [phone] . Fax 919 l 782-1288 3
PRELIMINARY NOT-RELEASED FOR GONSTRUGTION
F SINGLE FAMILY t T0NNH0lJ5E SUBDIVISION DATE: DECEMBER 1, 20~ EXTEN D DETENTION WETLMO ILEL I A 5. WOMBLE GHR I TABLE TRUST ,APEX, NORTH G1tR0L I N!~ PROJECT: 2002-024. 001

430
: 10855 I ,I f / / I PIN ~IUM. 07 2 18~ 13 f: /
~E: 03 7 I I I/ / r ' HANOWI~EL ~ IZO IN .R tt/ / r / ,
,~LEMBOC~KI , T AS F ~ NI~aR ~ , EL I Z C`f`I-t-A--
~ ~ ~ 1 I - REED-B99K---0~4I-- t r . D€€[~--P E I ~
l ! ( ~ f' / / r 1 TRASH RACK / t i I L / / / -TSasH Raac i , I
i t ST , N0.5, 2, YARD L NLET W T i r r / RASH RACK 6LEMBOGK I , TF(ON1A5 F ~ EL I ZAB~1`1•t 74- - 9~8~ I BELL ~9 -~E~ ~P~i6E 0 ~ I+ ~ ¦ i
1 , I/ ~ ~ o ! ~ t ! / / ~ r ! PRIVATE X11 GR - ~ ~ ¦ ~ / ~ ¦ ¦ ~ ¦
~ t ~ r / / 0 DOL, 548 SF, EL. -433.00 ! 1 ~ /
/ / 1 ~ ! r G / / 3 15LOP~5 / / G o v~
/ EASEMEN~ r / ~ / i PRIVATE ~
/ ~ , / / / / H I Gfi MARSH ~ / a ~ ,n?~~, DRA I NAME ,
. S , 1278 SF, EL, -432.. 0 / / ~ a m ! ! / / , ~ a a - ~ FES~ / EASEMENT / ~
j .~o, / ~ i ! i , JrOW H I I ' ~ / ~ ~ L J _~sp ~ J 5 BIFLOIa15-4$ IRIS VIR6INILMI4
/ / / ~ ; / / I ~ a ~3F r / ~ 3 ~ H IS . INIANMS~ ~ ,
r r r RPUS PUNGEN3-71 ' PELTMIDRh VIR6INIGMA~4 ~ ~ WVrNh fL ~(DM3 ~ PANiGUM VIR6hTUM-33 ~
1 r : ~ / ~ / ~ WATER QUALITY OR~iCE j RIP-RAP P IU1M VI TUhFl2 ~
l / ~ r Q / / / r ! ~
/ / ~ r / ~ / i ~ r OVERFLOW SPILLWAY DETAIL o \ ~ HIGH
~ ~ NOi TO SCALE ~ A /1/ \
1 / ' / / / r 1 I ~ ~ y r / ~ d a MARSH ~ - ' F ~ ~
f r / ~ / ~ ~ ~ ~ v ~ / / / / > > ~ I MvERTED Pvc 1 1 ! / E GENGY / / ~ / ~ a a snuRU~s ~ ~ ~ v v
! 1 , . ~ . . ~ PHON PPE ~ ! ) / i..1r I ~LI~`~AYj / / / I d . PELThNEIRl1 vlra6l ICA- ' ~ \ 11795 SF / ~ \
/ / } SAbI T/dtl A LAT I A- \ / ~ \ '0. 2 ] I AC
( r~ / r / ~ ~ ~ r r ~ ~ ~ ~ \ OUTLET PIPE ~ GMINA I -4 . `ai." ' ~ ~
1 S ? ~ ~ l Q r 1 HThENOUaLLIS G 1NI 89 ~ / \ / POOL - ~ ~ \
/ ~ ~ 4 P r ~ ~,G vALVE a ~ 1 / r r r I a s / r / ~ i~ s~:; ; i \ '
GI ~ v S r) IT Ih L.hTIFOLIA-138 \
P 5 j ! / / ~ r .1 , \ P i ~ 'L I f . ~ N 5 ~ v v H I5 GAROLINI
~ r ~ I SF F .r:~ N Th-3
~ , \ ` II / / r /r r \ ~ \ Q \ ~ ~ PM1IC,UI~Q TuM-~I 0.23 Ac v P / \
r ~ r a ~ ~y,. ! ~ ~ Z I ZAN l h I~JI-340 \
I / ~ r ` r / \ I 2 lF OF 4"OIP O INVERT ! ~ _ r ~ / RI'UJ 7b P~c~MI VIRGINIU192 A / ~ V
I , r ~ ~ ,IRIS VI IC11- \ \
I . / 2 X 2 YARD INLET I r W/ TRASH RACK I / r~ / / ~ ~ D1~ ~NT~ERI CORDATh-278 \ IKVVK RURUS by~ ~ \ \ ~ \
L I / / TOP pAM \ ~ , STANDARD DETA I L ~ ~ 5.02 • IRIS VIR6INI 3 \ ~ \ \ ~
APES I =„k~.'~;; nl ~ ~ ( p FOR INVERTS AND ELEVAII 5O r r ~ 1 ONS SEE PROFN,E THIS SHEET ' ~ ( \GANNA FLALLIDh-3 ~ ~ \ ~ ~ ~ ' ET \ \ , \
I / / / ~ N01 TO SCALE ~ i~ ~ ~ ~ J ~ \ 926 SF \ UNGUS IROId1S-83 ~ \ ~ .
Y ~ F BAY r / ~ I / / Plant U5t - 5tormwater Wetland / ~ \ \ ~ ~ v ~ \ 0.213 c \ ~ vA i
5a8 S~ ~ ~ / ~!I dlellYy tww Idea 6re110a Neae 4~1 mw ~ ` / \ • ~
r GI#18 ~ I I , / ~ / ~ 1 22s a c~ f,acucA ea.veN cANr~ is~ i \ ~ ~ ' ~ xn PANIUR+velf~Atuq enru~A,ss \ ~ , '
x~ Nr?e+ocAt~.lss cAr+alflunr~ s txY ~ ~ ~ '
~ ~ \ ~ fiA IRI6 VIR6INGA eu! rlAt• IU9 ~ \ ~ b• \ \ ~
ql .111fA+s EULOR76 1Mtll~ ItlhJB ~ I
s N 1 N 1 ~ - = N ~ 1 161 P!I S NYFf4MlA OGORATA rRAellANT MNTeR LrY Y ~ \ \ \ / i ~ K I6'I PlLTANDRA VMIeMGA Atil01V AqM b' ~ \
• ~ 210 Rp / y \ \ / I 210 RONflDlRII1 LORDATA PIlJm1E, tTlD IM ~ ~ ~ ~ \ \ ~ ~ ~
904 ~ ~ ~ sASIrrAAIA urlroLU~ sea~o~rAr AlworeeAO le' ~ ~ 863 SF 3~
110 3N no n cea~wa t.lr~aas rAIL r
M7 9GI - _ _ !40 1IL M7 fX:NlPUB PIMlIlNB 1111-dQ14kE EI,LIdIEi1 IE• -°-t 4 y, F.,~. ~ I_
!q0 11IFNY1AtilATKd raDltlG! b' E ~ Lf];:_ 1~~.~ K4I€:_ ~ ~
- -THE CONTRAG -THE CONTRACTOR S AN MJLCH N.L AREAS NOT COVERED BT PLANT ;i.G`f
tMTERIAL AF _ - UNTIL GRASS MATERIAL AFTER CCNSTPoJLTICN IS CDhPI.ETE. SILT FENCE SHOULD RBMIN IN PLACE UNTIL GRASS HAS 8EC01~ ESTABLISHED.
460 -SOIL DEPTH I -SOIL DEPTH MINIMUM SHALL BE 4'. et~fii~;-'aVI;IckL!s,,'A!ITy
WE7!JiPff~ P~~;U%it'"~?M`vbi;rE:F BRAPICH
- 4.2' X Z' T INLET - - ABSTRACT PRIEST, CRAVEN t ASSOCIATES, INC.
LAND USE CONSULTANTS
OUTLET DEVICE INFORMATION CE INFORMATION This analysis was conducted in order to comply with the City of Raleigh 5tarmwater management 3808-8 COtPUTER DRIVE, SUITE 104 requirement of limiting the post development runoff to that which would have occurred under RALEIGH, N. C. 21609
8 T OP¦~, 50 - n _ 2' X 2' riser Wit pre-development conditions during the +wo yeor design storm. X 2' riser with a I~' RCP barrel and a b~ resirictor HrOR1a1GUTATA
- 30 f a o t rip rap I " i~~ - - foot rip rap lined secondary Spillway ~gOVg p(~
i ` F ~ F - -8 _ _ _ _ _ - - _ . _ _ _ Norval Pool E l eva HTDROL061C MIhLI'SIS C,HfTER STREET, APEX FILE MANE : SEAGROVESFARMD4.I23 mal Pool Elevation 433,00 DRAINAGE POINT 5 - P05T DEVELCPtfNT DATE Nov 21, 2005
Top of Water GLaI n ~ - of Water GLality Pool Elevotion 434.50 ~ rat~onel,fmrwlo was vaed to determine the expected peak discharges +or each set c~ Cana ! ass •ar ttme of concentration was determined using,the Kiraich Equation. The itOrn hyaragraph ono tree rune •o ~'ERShEu SAND USE DA'A
+ ~ ~ - Principal Spi I INa ncipal Spillway Elevation 434,50 peak of the hydrogroph were determined In accordance with the Small Notershed dr a h Formulation 'ear Water Surface Elevation 434.78 Method outlined in N. Rooney Molcoci s'Elements of Urban Stormwoter Desi ~ ~ P TRACT DESLRIPTIAV SOIL
,450 - ~ ~ v i ~ ~ . 1 - 2 Tear Water Surf 450 10 Tear Water Sur ~ ~ ~ " 9n • APEA Tear Water Surface Elevation 436,46 N0. GRQ1P AC
Secondary SpiIINa ~ ~ 100 year Water Sw ondary Spillway Elevotion 43b. 50 Runoff volumes were determined using the Soil Caneervotjon Service methodology a outlined in NEH-4. I yeor Water Surface Elevation 436.91 = LBUILDIN65=AND=STREETS== = B== 98 095 L 59 >
- • ~ - ~ Top of &rm Eleva of &rm Elevotion 437.50 Runoff cotffic~ents and curve numbers were token from standard values based on land use in accordance 2 ~~APE AffEhS B bl 0.35 2.65 with Uow, tblcan, and NEH-4. 3 UNDISTURBED WOODED AREAS B 60 0.20 O. CO
V / - i - Forebay Elevation
--t - ~ - - _ Hi h Marsh Elevot ebay Elevation 430.00 Hydrologic soil groups were determined based on the Hake County Soil Survey and the soils information TOTALS AND COtf'OSITE NUft3ER5 74.4 0.58 4.24 h Marsh Elevotion 432.50 contained in NEH-4.
Low Marsh Elevatii Marsh Elevation 431.50 Roinfoll intensities were taken from National th
~ Micro Pool Elevot ro Pool Elevation 430.00 Wea er Service data complied by Molcam in Exhibit 2 of TI HE OF CONCENTRATION 'Elements of Urban 5tormwater Design'.
~ ~ Water quality poo By TR-55 methodology, printout attached 0.22 HR er quality pool drawdown orifice diem I, 0 in Topographic information used in determining drainage areas and hydraulic lengths was taken from the 13,2 MIN
- Drawdoun time fror wdawn time from falling head orifice 3.9 days City of Raleigh 615 data.
RUNOFF AMOUNTS
440 - - Determine runoff volume from S.C.S. procedures ATION BY TSE TOWN OF APEX PRIEST. CRAVEN t ASSOCI RTES, INC.
440 REVIEW CERTIFICATION BY 9 TOP OF Ei.•437.50 LND USE CONSULTANTS linch storm
_ - - - - - ~ - I YR. WATT EL. -436.91 ThiB ~ hoe been reviewed 3808-8 CUIPUTER DRIVE, SUITE 104 Rainfall I.~ inches BALE16ff, N.C 27609 CN 74.9
` wing by the Town of Apex, . ~iTR~ 3, =43b~ 55- _-_27; 00 l~ - - - 1>chef, ConfOlms to the iec]ulrEmmts Gdeblished in tha Town of Apex, and to the best of my knowledge and H7DROI.OGIC DATA Fram andscage AreaStreets 4565 cf
-~Pttti lbli8hed In the Standard Specifications of the Town of SEAGROVES FARM p 122 cf CENTER STREET. APEX FILE NAhE ~ SEAGRPIESFARfU4.123 Fram Undisturbed Wooded Are 0 cf
Apex. However, t~iis signatore does not ~atitute a vat e o. 74z I in an federal state or to C+ODStitute 8 Variance from any lEgnlrementa Contained DRAINAGE POINT 5 - PRE DEVEL NT OPtE DATE : NOV. 21, 2005 Average Runoff = 0.305 inches
y , cal code, law, epecificahon, ru rpecific~tion, rule or ordinance. The developerlengineer/ W+ITERSHEO LAND USE DATA Total Runoff Volume = 4687 cf
- _ ~ _ connractor is sokl \ _ y responsible for mewing all applicabl 12 WL ! B, 98>r ~ ia$ all applicable requirements. TRACT DESCRIPTION SOIL C. AREA 2 year storm
- - NORMAL q.. •433.00 I T-~. =N0i9==s=='9=====>__________________===>'9= ~P - CN hour, 2 year rainfall 3.60 inches
- ~ By' _ 8' S5 ~ - t LmIG _ „ 74.9 I BUILDINGS AND STREETS ~ B 9B~ >0 q5 > =0.00 =
430 - - - - - 2 CLEARED FIELDS, PASTURE B 69 0.35 2.14 Runoff = 1.365 inches 3 ROW CROPS B 75 0.45 0,00 Runoff Volume = 21Ct79 cf
430 4 UNDISTURBED WOODED AREAS B 60 0.20 O. BS 10 ear storm
CL~55 B \ SOIL EROSION AND SEDIMENT - - I " _ - - - - CERTIFICATION BY IiD SEDA4ENTATION CONTROL y TOTALS AND COM°OSITE NUhIB~S 66.4 0 31 299 24 hour, 10 year rainfall 5.38 inches
- - - THE T I' 01 v - ON BY THE TOWN OF APEX cN 74.9
- ~ ~ - - - - - ~ i D 13 I This ~ Tltf dF CONCENTRATION Runoff - 2.75 Inches Runoff Volume 42319 cf
_ _ -1~12~' _ _ _ drawing has been reviewed by the Town of Apex, a "own of Apex, and to the best of my knowledge and By TR-55 methodo I oqy, printout attached D 17 HR
I - - - ~ belief, conforms to >ibe irements establish ' requ ed m the S bushed in the Soil Erosion and Sedimentation Control 10.2 MI N
_ _ _ Ordinance of the Town of Apex. However, this signahu _ ~ n, L.I , ~ - - - - - any requiremens cotitaiued in any federal, state, or local per, this signature does not constitute a variance from ~^~F MTIUNTS
- ' - ~ N•3 0`--- ordinance. The develo r/en ' / d,state, or local code,laW,SpeClflfrZat1011,rUlCOr Determine runoff volume from S.C.S. procedures DETERMINE THE ANTIU PATED STORAGE VOLUMES
- - _ - pe gineet contractor is solely r rector is solely responsible for meeting all applicable 2 yeor storm Water Quality requirements mandate control of the
" N/ 6' RE'STR CTOR requirements. - - Z z Z - 420 THIS SIGNATURE DOES NOT CONSTITUTE PLC 24 hour, 2 year ra~nfoll 3.60 inches runoff from the I inch storm. 4607 cf 3TI1'UTE PLAN APPROVAL, ONLY PLAN cN q
- - - D 420 V,a 5.9 F/S REQUIREMENTS. A SEPARATE LETTER OF PLC Town of Apex Ordinances ;TTER OF PLAN APPROVAL WILL BE MAILED RunofF = 0 mandate control of the 2 and 10 year sto 20319 cf
_ _ . _ TO THE FINANCIALLY RESPONSIBLE PERSON 878 inches BLEPERSONATALATERDATEACCORDING RunofF Volume 9528 cf Si:e an extended detention wetlan
~ - TO THE CONS UCTION SE UENCE. T~ Q ds to treat the runoff from the site. fCE. 10 year storm
N 24 hour, 10 year rainfall 5.38 inches Normal pool depth 3 feet
B - ~ _ Y~ Date: z x - ~ ~ 4 Impervious cover percentage of the tract 0.38 ~ Date' Surface Area to Crainoge Area Ratio 1.65
Runoff ~ 2.03 inches Re uired Surface Area 0,07 ac Runoff Volume 22000 cf q
3047 sf CA RQ Surface Area Provided 3650 sf
- - - REVIEW CER TIFICATION BY TI: ATION BY THE TOWN OF APEX p , S ,,y
- PUBLIC WO _ - RKS AND U 'ORKS AND UTILITIES ~,~o ~'~9
9
4 ~ 0 4 (0 This drawin g has been reviewed by the Town of Apex Pt V mot: own of Apex Public Works and Utilities artment
and to the best of my knowledge and belief, conforms to ~ of, conforms to the requirements established in the I • .
- - - _ _ Standard S eci6 - _ _ P catwns and Consbnichon Details and the uwii Details and the Unifi ~ 0 a~~u r~~rti
Town of A x. However this si ed Development Ordinance of the P ~ CA R ~i, Rq E ~ OC[ saes not constitute a variance from ao eats Y M ~
_ ~ Pe gnatute does not constth - - contained m any federal, state, or local coda law ifil Y req~ ~ 0 , de law ificati ~ 04
- - - devel /en ' ! contractor is solel open gineer y responsible for iY ,spec on, rule or ordinance. The
;sponsible for meeting all applicable requirements. _ L _ b~ 30 15 0 :0 b0 100 50 25 0 50 100 : ,_10156 ~
A.~M I iM 7iM 11.M alM c ~ ~
~ w .mow -tTw 7~'W !)+W ~ I BY: Date: Date:
•~l N
GRAPHIC SCALE GRAPHIC SCALE iy S F. 1MVISED P-P TEST RAvEN ASSOCIATES 5
~~~1~1111111~<<
SEAGROVE'S FARM 5G^`E. "5 PLAN E PROF I LE
S i Nc~E F,~ra i Lr e TOWNHOUSE sueai v i s i ON DATE. vEc~e~z 1, zoos ' 'INC.
LEL I R S. WOMBLE GkR I TABLE TRUST ,APEX, NORTH CJIROL I NIA PROJECT: 200'2-024.001 EXTENDED ENT ION WETLAND P
41) POND # 5 LAND USE CONSULTANTS PLANNERS / LANDSCAPE DESIGNERS / SURVEYORS / ENGINEERS 3803 - B Computer Drive, Suite 104 Raleigh, N.C. 27609. Phone [phone]. Fax [phone]. Email [e-mail] 42
PRELIMINARY NOT-RELEASED FOR GONSTWGTION

' ,
I ~ ~ ~"I.J /
\ ~ \ i I I ~ CI: I ~ / ~ I ~ ~l a \ ~ I I I I ~ ~ /
1 .1 ~ 3 S /
T ~ b~ 1 / i I 1 . I ~ I I / I / . , PRI vATE ,
F ~ ? ~'PRIIVATE I 11 i / i~ I a ~ ~ , DRS, I NA~E
o • I ~I ~ ~ ~ ~ jai NA , , EASEMENT
i ~ 1 1 EA - ME T; 1 ~ ~ ~ t 1 ~i ~ ~ R®AR I I I
G~,#4 I 1 1 I~ ~ ~ ~ ~ ~ - I \ ~ F~ #6 I
~ \ ° I FE #6 I ~ I ~ n N ~ ~ ~ I, I TRASH RACK j I I ~ JUNU15 BI FLOW15-99 I
~ ~ i ~ ~r• I ~ I ,i I SAURURUS GERNUUS- I I I
~ ~ I I - HYME9JOGALLIS CAROLINIANA-42 I ! I I
~ MH# 52 I i ' 1 ; I I I _I 1 l 1 I
- 1 1 I 3, I I I, , _ T - 1 1 ~ I 5L I - 3 SA6ITARIA LATIFOLIA-73 ,i i I j - 9 H1'~IOGN.L 15 CAROL I N I ANA b
IRIS YIR6INICA-14 I i I I ~ ~ SLIRPUS PUN6Bi5-98 I PANI6UM VIIR6ATUM-33
~ I 1 I ~ ~ / 1 ~ 1 ~ f / Q d PTiTANDRA VIR6INIGA-90 I AY + ~ FL IDA-5
15~~. ~ Q HC I ? e ~ a '
~ a ' p I I ~ a ? ELF a . Oo I r . - ' PELT DR/~i yl ~I NI GA-53
I 1 - I I I _ H I H?~ ' a I
1 I I ~ , I ~ + 1 I
1 , 1 I I, ~ 12611 5 ~ a.. a.. - ~ ~ , a , ZANI A °~1~lATIGA-295
EL. 446.50 I / / i wATEIt wn ortlFlc~ 1 1 ~ 1 ~ 1 1I Qu Q / / , ' I
I ' ? (~hL MARS 12 ~ SF / ~ 1 ~ I~ / ~ / c I i
~r': ~ 4
1 ( I 1. 1 I / 1 I - / I I I I N ODORlITA-3 a I
- TOP: R IEL. - 51.;00 ~ a a 1 IRIS YI I IGA-31
I 1 1 / / / 1 LF 1' t~IVERTED PVrr ? I 5. 2~1 A I NL . T~ / / SIPHON PpE 1 I STD, N , ~ RD I I I .I , , a a IRIS VIR6INIGA-80 I ~ ' i GJ I SGI PWN6EN5-74
1 _ 1 i. ~L~EW T - .4 ~ / / ~o ~
I / / / / ~ TYP) ~ I ~ I / ~ / ~ i i I I OUTLET RPE ~ 18 /
I Q ~ i /
- I , ~:1, - / / / / , i I I/ ~ / 4 PUIC YALYE a ~ 4 I HYh@IOG~LLIS GARCLINIANA-102 I
~ 1 I I / , ~ / I 'rt: I ' I ~ I
1 .D I 4 ~ ~ f PQIT®ERIA GORDATA-221 I p~E i ~ L
' 1 I I 1 ? P , ~ r + (N I ? ~ I 1• ~ / / PANT GUM VI R6ATU1476 I , F~~ - '~:1 I
MH# a I E ~1GY : ~I L WAY _ ~ I I I NTtPHAEA ODORATM9 JIN~U~. BIFLORUS-76 i
I I ~ I I ~ ~ L,. ~ a s a 3 -I ? / a IRIS YIR6INIGA-23 I
_ I I I I ~ / c GMMA FUIGLI DA-9 I
. ~ ry ~ 2 ' ~ 4"DIP o IMIERr JUNGUS BI FLOFdJS-32 _ 6~ I SA61 TARI A UT I F0.I A I G5
~ ? 1 1542 `SF! / ~ . 6 / I ~ ~l~ ~~/y xIRPUS PUN6~5-63 IRIS VIRfifNIGA-8
~ , ~ , I; ~ ` ° ~ 2 X 2 YARD INLET W/ TRASH ii I ' I I El.. ;44.4, 00 ~ / i r- IIV1.7H IVRrI~ I i I , 61~~ -
~ ~ I I / STANDARD DETAIL 5. I ~ ~ ~ 02 1 1 6 ~1 I / / , 111 ~ ? ~ 1 1 I , , / ~ ~ STS ~Ilo ta.EV~irolls s~ PROFLE ~ 5. ~ ~ Z I ZAN I A AGIJAT I CA 92 I j \
1 ? ? s 1 I ? . , s slr~T 1 ? l I 1 1 1 b ~ / NOT TO SCALE K>F~.E iE#S SHEET 1 I 5 CAROL I N I ANA-38 Plat List - 5torrrwrater Wetland
t A ~ ~ 1 ~ , ~ ~ I I I r i iT i ~ 30 ~ 5' WT I L 11~Y I I
e uwN naccloM aa,DeN cARN~ EA M ~ I E EN i
10~ PARIf.UMV111eA11R1 f>rfTCIMRA1e
p 1 1C?QQ4t (T1fP) I , I I I ~ I~ ~ ~ I
M 1 M . 1 ~ ~ 80' ~ ~ . . ~ i I i ? ` . ~a cue eRtaas seas Rue+ r ~ ~
I 1 ~ J _ pap ~ Nr~eA oooro?Tl? r~AaRAHr rMiee ulr ~ - ~ O .vl ~ j~ ~ I
, ~ ~ .r ~ st.l`l D ID? PdTAIORA VMIK,A AFIaOY! ARUM ~ ~ , I ~ .
m roNre~ew? coia+?TA . raD w _ 1J(i
_ - - RIP-R RIP-RAP ne tASnTAirl? u~M eRflADLrAr ARROMIeAD w _i r-.'.. . NS Yi1Rel~iw~ LIZARD'S TAN. 7
~ IGMMI~R#~~ iM~-YiMI! /I~IYM k" ~t'vl•, w i 'tt C,iL~LITY
vyr, ~ ,+hUS rNCr Gi~WATLR 6RANCM ~ atAwn A~?11f,A NtD RIDE b'
- O'V~L.OW SPILLWAY DETA ~Y DET~11 L -i~ CONTRACTOR yfAL1 SEED AND MJLCH ALL &ARE AREAS NOT COVERED By PLANT
~ 2' X 7 Y INLET NOT TO SCALE r - f - n++TERik AFTER CONSTRUCTION IS COMPLETE. SILT FENCE SMQAO REMAIN iN PIALJ:
ABSTRACT ~T,~ ~A55 nn5 BELQf QSTABLISHED. PRIEST, CRAVEN E ASSOC I RTES, INC. ABSTRACT -SOiI DEPtH NiNiMM StuLL f!E 4'. LAND USE CONSULTANTS
- ~ OUTLET DEVICE INFORMATION - - f ~ _ _ This ana
This 0nO1y5i5 was conducted ~r order ra conply with the City of Raleigh storm»a+er monegcmcnt 3808-B COPPUTER DRIVE, SUITE 104
~ 2' X 2' riser with a 12' RCP barrel re uiremi 460 ~ 3o foot ri ra lined secandar s illwo re-deve P P Y P Y P requirement of limiting the pos+ development runoff to that which would hove occurred order RAIJ:IGti, N. G. 27609 pre-development conditions dur~nq the two year design storm. NYDR0.061G DATA
SEAGROVES FARM
_ _ Normal Pool Elevation 447,00 Top of Woter Cuolitr °aalElevatian 448.50 H1(DROL061 HYDROL061 C ANALYSIS BEN fER STREET, APEr i - r .ra,-c ~ r ti; ~ r ,r. AFn.t~,„ ;
_ Principol Spillway a+at~on 446.50' DRAINAGE POINT 4 - v05T DEvELOPrfNT DATE : tJQv 2i 2OC5
2 Tear Water Surface Elevation 448.82 The ratii 10 Teor Water Surface Elevation 449.61 time of i The rational formula was used to deter¦int the expected peak discharges for cach set of conditions. the WATERSHED LAND USE DATA time of concentration was deter.~ned using the Kirpicn Equation. The storm hydrogroph and the tint to
Secondary Spillway Elevation 450.00 peak of i peak of the hydrograph »ere Gr!er~,ned accordanr-e »,th the Small Watershed Hydrograph Forn~ulotion TRACT D~CRIPTION SOIL C. AREA
` 100 year Water Surface Elevation 450,35 Method of _ - _ _ _ - - - ! Top of Berm Elevation 451,00 Method outlined in M Rooney "1a~ca~+s 'c't~t~!s of [,rbon c+orm»a!er fksign'. ~ GROUP A . C
_ _.r _ Runof f vc ~ _ ~ Runoff volumes were do!am+rtd us=nq !~c So+~ ConscrY;,+ 5trv;ce methodology as outlined in NE«+-4, I BUILDIN65 AND STREETS B 98 0.95 1.86
~ ~ Forebay levation 444.00 _ \ ~ , \ TCP BEM a •A51 ~ Hiqh Marsh Elevation 446.50 Runoff ce Runoff coeff icienl+ and :u+v. r.*^vs were eaten f.om ,+a^dard values based on land use in accordance 2 LANDSCAPE AREAS B 61 0.35 2, 72
~ ~ Low Marsh Elevation 445.50 With Choi with Cho», Malcom awn. ',c»-a 3 UNDISTURBED HOODED AREAS B 60 0.20 0,00
- ~ 450 Micro Pool Elevation 444.00 40 ~ 3 5 I Hydroloq~
- Woter quality pool drawdo~n orifice diam I.0 in containee Hydrologic soil qr~,;*e »e•r 4r•r~-~,,c.d 5a?ed on 'he Mr,+e (:aunty Soil Survey and the so~i, rro-.noon TOTALS AND C0h>F'051TE NUMBERS 16.0 0.59 4.58 n contained in NE"-~
_ ~ Drawdown tine from falling head orifice 3.8 days lays TIME aF coNCENTRATION
~ a,=~ ~ Rainfall CLA55 B 'Elements Rainfall intensities «cre !akr~ Nat;ono, Wcother 5r.rv~te data complied by Malcom c•~.t,+ 2 of 'Elements of Urban S+ar~n•a•r :'•s ;,A'
_ ~ By TR-55 methodology, printout attached 0,21 HR
- - REVIEW CERTIFICATION B'Y THE TOWN OF APEX To o ra t - - ~ Pq P ~ City of I Topographic informat~an uscc ~ .^.r,•ern+ n nq drainage areas and hydraulic lengths was 'ar•^ the 12.6 MIN City of Raleigh GIS da!a RUNOFF AMOUNTS
D ~=b' i
This drawing has been reviewed by tbe Town of Apex, and m the best of my knowledge and _ _ . _ . establislud is the Stmdatd S ifiatioos of the Town of PR I Esr, PRIEST, CRAVEN t ASSOCiA'E` ~'+w Determine runoff volume from S.C.S. procedures
~ - belief, COnf0®8 tl! the r'Egntre Pa LAND USE LAND USE CONSULTANTS
- - - - - ~ - - Apex. However, this signature does ~t constitute a variance fi'am a~ regoireements contained 3808-B c 3809-B LOhPUTER DRIYf. ~t''4 ~-s Inch storm
_ MNT~ I TY f - - _ in an federal static or local code law, RALEIGH, y apecifiation, role a ordinance. The developerlengineer/ ORIFI RALEIGH, N. C. 21bOQ Rainfall 1.00 inches CN 7b. 0
44~ contractor is sole( 'ble for all ts. Hl'DROLOC Y ~g ~ HYDROLOGIC DATA
2124_ . SEAGROVE SEAGROVES FARM Fram Buildings and Streets 5340 cf CENTER STREET, APEX FILE NMf SEAGROVESFARMD4, 1 Fram Landscape Area 125 cf
ri ~ MITI- , - - - CENTER 5 - BY~ Dam DRAINAGE DRAINAGE POINT 4 - f'$ Cr`.~t:w~~'fNT DATE NOV. 21, 2005 From Undisturbed Wooded Are 0 cf
G0.LAR____ _ _ WATERSHE WATERSHED LAND USE DATA Average Runoff = 0,329 inches
Total Runoff Volume 5465 cf
z- I - SOIL EROSION AND SEDUMENTATION CONTROL iRacT 1 j. 75i _ . - _ CERTIFICATION BY THE TOWN OF APEX TRACT DESCRIPTION SOIL G ARF+ ~ ~p k :year storm
24 hour, 2 year rainfall 3.60 inches
~ I 2 I BU I LDI NCf~ MID STp' F TS B 48 0.95 0.00 LN 76.0 2 CLEARED FIELDS, P~5':;p: B 64 0,35 0,00 Runoff = 1,440 inches
_ ~ ~ - - _ _ _ _ . _ 7~ dr'ewing ~ be reviewed by the Town of Apo, and to the best of my knowledge and 3 - 3 ROW CROPS B 75 0.45 4.85
' belie!; conforms to ~e requirrments established m dle Soil Erosion and Sedimentation Control 4 - 430 4 UNDISTURBED NOC,OEn PEAS B 60 0.20 0.1C Runoff Volume = 23941 cf
430 - Ordinance of the Town of A x. However, this a does not constitute a variance from Pe a~ TOTALS A TOTALS AND COMPOSITE Nl"'EJEo` 73.1 0.42 5.55 - near storm
gay requirements contained in any federal, state, a loaf code, law, specift~ion, rule or 24 hour, 10 year rainfall 5,38 inches CN 7b. 0
_ _ _ _ ordinancx. The developer/engineer/contractor is aokly teaponsible for mating all applicable TIME of TIME OF CONCENTRATION
reglmements. Runoft = 2.85 inches
_ . - TBIS SIGNATURE DOES NOT CONSTITUTE l1.AN APPROVAL,ONLY PLAN By TR-55 mt~ho4c'crv printout attached 0 nR Runoff Volume = 47453 cf I7 1 NIN
- - . A SEPARATE LETTER OF rI.AN APPROVAL WILL BE MAILED REQUII~I~MF.NfS
_ TO THE FINANCIALLY RESPONSIBLE PERSON AT A LATER DATE ACCORDING r~NOFF A RUNOFF AMOUNTS ~IIIINNf~ "o°t, NE THE ANTICIPATED STORAGE VOLUMES CAR Aiy
TO T~ CONSTIIUCTION SE UENCE. _ Q Determi n Determine runoff vo'uu' +rr* ~ C.S. procedures
- _ - - - p.„ Water (Lalit re uirements mandate control of the 0~` SC ~ y q ~ ,9 4 runoff from the I inch storm, 5465 cf ~ ~4,~
- "1 _ 2 year s _ _ _ 420 2 year storm ~ =
420 :a ~c,• ear rainfall 3 b0 inches Town of ex Ordinances ~ = _ T ~ s~ - 'ti 73.1 mandate control of the 2 and 10 year sto -4760 cf
_ - REVIEW CERTIFICATION eY THE TOWN OF AIrFX
_ _ _ _ _ . - - - - PUBLIC WORKS AND i111I1TIES - I . a54 inches ~ +...D DETENTION hETLANDS 51 ZI N6 CALCULATIONS 0 v • , , s
~ rc an extended detention wetlands to treat the runoff from the site. q Y M~
10 year 10 ear storm NNE Y
This drawing has ban reviewed by the Town of Apex Public Works and Utilities Departmem ,ear rainfall 5.36 arches Normal pool depth 3 feet 73.! Impervious cover percentage of the tract 0,41 % 11111111/
gad to the best of knowle a and belief, coofanu b the cuts established in the my dg tequttem Surface Area to Drains a Areo Ratio 1,77 ,alll
_ _ _ _ . - Standard Specifiations and Construction Details gad the Unified Developtaent Ordinance of the q ~ N CARP
- . Town of .However this si dog not oonatitdte • variance from m re ' A~ ~ Bad Y 9uunmenb + . ~ .w = 52213 c + Required Surf ace Area 0, 08 ac ~ y i ~ OFE 3531 sf Q~
_ _ _ . . _ _ _ t~mained in gay federal, state, or local code, lire, tpet~5abon, rule or otdhmtce. The L
_ - deve( contractor is sole( re bk fa all liabk uirements. Y ~ ~6 aPP ~1 410 Surface Area Provided 3550 sf ~ ~1 ~ ~
~tln
60 30 3 1 60 100 50 25 0 50 100 %$A,
0+00 1+00 2+00 3+00 By: D.r. ,o Roo-M
" SCALE GRAPHIC SCALE
I
SEAGROVE'S FARM INAPROJECT: - AS PLM E PROF ILE PRIEST,C-R-A-vEN AsSOCIATES,INC. or=
ID POND *4 LAND USE CONSULTANTS PLANNERS / LANDSCAPE DESIGNERS / SURVEYORS / ENGINEERS 38042] 3 - B Computer Dnre, Suite 101 R&Wsh, N.C. 27609. Phone 919 / 781-0300. Fax 919 / 782-1288, Email PriestCmvenQnc.n,com
F s i Nc~E F,~r~i Lr c TowN+~ou~ susui vi si ON DATE: DECEMBER 2005 EXTENDED DETENTION WETLMD P ILELIA 5. WOMBLE GHR I TABLE TRUST APEX, NORTH GItROL 2002-024.001
PRELIMINARY NOT-RELEASED FOR CONSTRUCTION

- ~ /
~ - O ~ I ~ ~ w j
i- ~ y I \ ~ ~5/
_ ~ ~ HAI~MMEEL ~1 REBAR ~ 1 ' CI#72 / / ~ REBAR ~ j ~
~ I ~ ~ ~ ~ ~ m v
I ! l ~ _ ~ ` TRASH RA( TRASH RACK C ~ I / /
~ ~ . /
. . ~ ~ I O . . • I r / 1 / ~ ~ \ ~ GI#~3 / / ' PDE / / 20
! I m ! ~ ~ V -
1 ( ~ 1 ~ 1 ~ ~ _
\ / i ~ ~ ° d 2 _ _ - - _ - r' Sh61TNilh LhTIFOLIA-141
d ° ~ HI MA SH 0 ~ ~ p
/ I 9 56 / F BAS` ~ - N'fhPHhEA ODORATA-3
~ E =4 /8.50 ~ ~ MH# 24
- ,1 X99 ~ SF I: 85b ~ a ~ / / / La ~ EL.~4 ~ _ _ -
~ / / I ~ ~ ~ ° a a
/ 1 / WATER WAU1Y ORIFlCE _ JUNCUS BIFLORUS-152
~ 3c I ~ - - RETAINING WALL ~
I -
/ / a ZI ZMI I A Mf>X1AT1 GA-351 SAURURUS GERtJUUS-133
/ ° / / / / / ! ° a HYh~IOChLL 15 GAROI. I N I MIM CANNA f'tAGCI DA-3
~ / / / / / - _ - - _ _ ~ - - - - 1 LF 1 INVERTED PVC ~ ~ - - - SIPHON PIPE PQ.TMAth V I RGI N I GM 106
~ / d / INLET' i ~ / 2 X ~ YA~dD
~ ~ W/ 'rT RAGK / / OUTLET PIPE
a
/ / ~ i / / , ~ ' - 4"Pt.UG VALVE d ° ~
FOREBAY ZIZANIA A(iJATIGA
RI VATE ,r ~ ~ RET~c(N I NG L ~
f i
' ~1 \ I'. / RO MI G
N / ~ ,f n SAGITARih LATIFOLIA-IC8 POOL n
~ ~ ~ ~ ~ i ~ 1 ~ fi 'G 1 2 LF OF 4bIP b INVERT
GI
~ 111 ~ + ~ ~ / ~ ~ - ~ , ~ - ~ ET TRASH RAGk INL W/ '~5H R~rGK
TOP OF ~ ~ 2 X 2 YARD - ~ ~ - 2' I / 15 ~ ' ~ 24 GMT ~ULI~~ 8R 02
ro E~. =425. oo ~ ~ DETAIL 5.02 sLO~FS STANDARD ' + - ~ ~ ? / ~ ~ I N=4.00: 5't/- ~ / J i ~ _ ~ a FOR INVERTS AND ELEVATIONS SEE PROFlIE 1FNS SF~ET HIS SHEET ~
/ ~ i i i ~ I 4 + - CO NOT TO SCALE < ~C1T=399. /
> t-~ r 1,~ ~ n ~ ~ ~,I i.
.42450 EMERGENCY ~
t List - 5tormwater Wetland SPILLWAY ~ 20~i~
I .4 50 Plan ~ PANICUM VIRGhTUM-253
R ~ ~ ~ ~ ~ 9 3 ~ ~ 6 dally G0~OA~ iR15 VIR6INIU~45 ~ r ~t~,;Tv n uANtA n~ccmA aaoet cAf4fu? - - - - ;rid"r;' - +;aA"~ i c~ ~itAtdC'~
RIP-RFP avreffae~Ax 3 ~ ~ - - - - - - aYEi~.ANxIT''i~ RIP-RFP ~ ~p tJ
~ {ry~,A~LIb cA~aI~ANr, flPltt~ far b' ~yiA FLAGG I DM3 ~ O PELTANDRA V I R61 N I GMRB
4s Iwo vlblocA ewe ftAb IRI6 I/~ Y ~ ~ r JUNGUS BI R.0Id15- 158 NYhPHhEh ODORATA-4
Y DETAI L 11 rlo .ulufa flr~ SNJRURUS GERNlUS-40 Z ~l ~T'r, ~ L ~ ~pHAE/1 ODORATA f~tAeMnr wueR fxY r - PCNTEDER I A LORDhTh-4A9
_ OVERFLOW SP I LLWA - - NGT TO SCALE ~ PCLrANptA Vxt6ntlcA AFtlM ffY GlJ~IA FI.ALG I DA-5 - ~ <
44a roNtmewA ealevArA r re9 b` 3
- o - sly tlA6ffrAwA unrau eaoAOLE~r b' -I
srti~w?sca+rAUS w.~wcsrAlL r FES rrrr
rr rr rr rr Y~LDItIG! r r r r r
- T I ON ~ - OUTLET DEVICE I NFORMA rr rr rr rr rr rr rr rrr
_ - -v - r N - - 2' X 2' riser w i th a 12 RLP Barre Y PLANT -THE CONTRACTOR SHALL SffD MID MULCH ALL BARE AREAS SIiOULDEREHABN IN PLACE
_ - 4~/ r 1 fined 5econdar s i I Tway • ~ ~ DroNdown t~me from falling hen arif~ce 3,6 days MATERIAL AFTER CONSTRUCTION IS COMPLETE. SILT EN UNTIL GRASS HAS BECQft ESTABLISffD.
440 ~ - w r Normal Pool Elevation 419.00 -SOIL DEPTH MINIMRI SfW.I ~
r - _ Top of Water Oual~ty Paol Elevation 421.60 - - _ -
v V X Y1~ Principal Spillway Elevation 421. - - 2 fear Water Surface Elevation 421.76 _ r _ -
10 Tear Water Surface Elevation 423,13 - ~ 423.50 f'RI EST, CRAVEN t ASSOCI RTES, INC. ABSTRACT LAND USE (ANSULTAHTS
- Emergency Spillway Elevation - - ~ T =421.60 100 year Water Surface Elevation 424.00 This anal sis was conducted in order to comply with the City of Raleigh starmwater management 3608-8 COtPUTER DRIVE. SUITE 104 y RALEI fiFl, N. C. 27609
Tap of Berm Elevation 424.50 EXISTING requirement of limiting the post development runoff to that which would hove occurred under pre development conditions during the two year design storm. MYDRGLO6IC DATA
- - Forebay Elevation 416.00 SEAGROJES FARM
- ----p- ~ ,p Hiqh Marsh Elevation 418.50 CENTER STREET, APEX FILE NAME SEAGROVESFARMD4,1 HrDROLOGIC ANALYSIS DRAINAGE POINT 10 - P05T DEYELOPMENI DATE NOV 21, 2005
0--~ Q LoN Marsh Elevation 417.50 - - - I .p M v ~ ~ 41 b. ` J_ 430 Micro Pool Elevation The rational formula was used to determine the expected peak discharges far each set of conditions. The WATERSHED LAND USE DATA
- - A W W lu {ime of concentration was determined using the Kirpich Equation. The storm hydrograph and the tine to peak of the hydrograph were determined in accordance with the Small Fhtershed Hydrograph Farnulatian TRACT DESCRIPTION SOIL C. AR
430 Water quality pool drowdown orifice diam 1.5 in Method outlined in H. Rooney Malcom s 'Elements of Urban Stornwater Iksign'. NO GROUP
Runoff volumes were determined using the Soil Conservation Service methodology as outlined in NEH-4. I BJILDIN65 AND STREETS B 98 0.95 3,00
2 LANDSCAPE AREAS 8 61 0.35 4,32 Runoff coefficients and curve numbers were taken from standard values based on land use .n accordance 3 UNDISTURBED WOODED AREAS B 60 0,20 0,00
17.00 LF _ - - ~ _ = to W CERTII~ICATION BY THE TOWN OF APEX -~a-~- _ _ REVIE with Chow, Mo Icon, and NEH-4.
based on the Wake (aunt Sail Survey and the soils information TOTALS MID COMPOSITE NUMBERS 16.1 0.60 7.32 Hydrologic soil groups were determined Y
contained in NEH-4.
~ _ - has been reviewed the Town of Apex, and to t)~ best of my knowledge and s' w. 955 < - - This drawing by W~e~C and T I M`_ OF CONCENTRATION Rainfall intensities were taken from National Weather Service data complied by Malcom in Exhibit 2 of (the Town Of 'Elements of Urban Stormwater Design'.
- ~ ~ I I YR. 4NTER SURF a. •~11~3.06 ~ established in the Standard Specifications of the Town o behe~conforma requurome~a By TR-55 methodology, printout ottoched 0.19 HR 11.4 MIN
- ~ ~ 2 thin ai doea not constitute a variance from any requirements contained r ~ - Apex. However, gnature Topographic inlarmotion used in deternininq drainage areas and hydraulic lengths was token from the 'C~0~CnglnCerl City of Raleigh GIS data, PoJNOFF AMOUNTS
- - ` ~ ~ I start or local code, law, specification, rule or ordinance. The developerlengineer ~ many federal, , _ 420
- - - ~ contractor is solely responsible meeting all applicable regi»teinents. 420 ~ Cetermine runoff volume from S.C.S. procedures
~ , ~ NoRrv~ ~.=ale. oo - PRIEST, CRAVEN f ASSOCIATES, INC. linch storm LAND USE CONSULTANTS Rainfall 1.00 Inches
~ e - BY' w ~ 3608-8 COMPUTER DRIVE, SUITE 104 CN 16,2 RAZE I CFI, N. C. 27609
From Buildings and Streets 8613 cf
HTDROI.OGIC DATA From Landscape Prea 199 cf SEAGROVES FARM Fron Undisturbed Wooded Are 0 cf
_ SOIL EROSION AND SEDIlVIENTATION CONTR CLASS B CENTER STREET, APEX FILE NME ~ SEAGROUESFARHD4.1 GRAINA6E POINT 10 - PRE pEVELOPtBIT DATE ' NOV 21, 2CO5 Average Runoff - 0.332 inches
CERTIFICATION BY THE TOWN OF APEX ~ - -r---- Total Runoff Volume = 6812 cf
- - - ~ I I WATERSHED LAND USE DATA
~ This drawin has b ' n reviewed by the Town of Apex, and to the best of my know edge an - = g ~ D ~ 13' BR+FK~ - Iwled a and SDIL c. 2 year Storm g TRACT DESCRIPTION ~ 24 hour, 2 year rainfall 3.60 Inches Ration Control N0 GROUP LN 76.2
_ belief conforms to the requirements established in the Soil Erosion and S entarion ntro 'ar18nCC fNnl I BUILDINGS AND STREE S B 98 0,95 0.16 Runoff = 1.449 inches
- - - - - ` ~ ' once of the Town of A .However, this signature does not constitute a variance m Oidm P~ 2 CLEARED FIELDS, PASTURE B 69 0.35 0.27 Runoff Volume 30507 cf 1, rl1IC Or 3 ROW CROPS B 75 0.45 I , 29
4 I 0 ~ federal state or local code, law, s ecification, rule or _ _ - , _ r any requirements contained in any P 6~1 a liable 4 UNDISTURBED WOODED AREAS B 60 0.10 5.40 10 year storm
- - - ~ i - ce. The develo er/e ' eerlcontractor is solely responsible for meeting all applicable - ordinan P ~ - --1-+------ - 24 hour, 10 year rainfall 5.38 inches TOTALS AND CAhP051 TE NAIt~ERS 63.9 0, 27 7.12 CN 76.2
' requirements. .Y PI+AN Runoff 2.97 inches
i ATURE DOES NOT CONSTITUTE PLAN APPROVAL, ONLY PLAN - THIS SIGN LBEMAILED 11Mf CF CONCENTRATION Runoff Volume = 76177 cf NIININ~jjN~
- - RE UIREMENT$. A SEPARATE LETTER OF PLAN APPROVAL WILL ANT I - Q - to rintout ottoched 0.26 HR ~A ~ ACCORDItVG By TR 55 mcthodo qy, p ~~~~~RQ( yj4
INANC LY RESPONSIBLE PERSON AT A LATER DATE ACCORDING _ TO THE F ~ 15.6 MIN ~ w~' $
8 ~ _ - - - - - - TO THE CONSTAIUCTION SEQUENCE. N- wP ' DETERMINE THE ANTICIPATED STORAGE VOLUMES =~w V A 4 RUNOFF At'KJUNTS ~ ~
- I i o, oo LF _ _y~a, - - By: Date: ~ - Cetermine runoff volume from S.C.S. procedures Fbter Cuality requirements mandate control of the runoff from the I inch storm. 8012 cf $ _ S
_ - -t3~-REP-- - . - _ - - ~ DET'TH=2 58 - Town of Apex CFdinances ~S •S1;
- - - STONE - ---8 - 2 year Storm .Oil 24 hour, 2 year rainfall 3.60 inches mandate control of the 1 and 10 year sto 28991 cf 4 ,tV ~ ~ 0 ~
400 - - - REVIEW CERTIFICATION BY THE TOWN OF APEX CN 63.9 q' I' .r+`~w0 EXTENGED DETENTION I~ETLANDS SIZING CALCULATIONS ~ c~ ~~~i~ c P.~
- ~ ~ ~ PUBLIC WORKS AND UTILITIES ff 0.752 inches qY M ra,na
Runoff Volume = 19438 tf Size an extended detention wetlands to treat the runoff from the site.
- ~ ~ ent Normal pool depth 3 feet a~t1~~~~~~{~~4//~~ ~~1..,exbn~t IO year storm I 5.38 inches Impervious cover percentage of the tract 0.41 ~ ~ CARD ~~j/ `"'`"'WW'"'`"''' 24 hour, 10 year rainfa I
- This drawin has been reviewed by the Town of Apex Public Works and Utilities Deparlm _ - g - z Surface Area to Drainage Area Ratio 1.77 ~ IIShCd In the cN 63.9 ~ ~ ~ji i,~
- - and to the best of my knowledge and belief, conforms to the requirements m e ~ 0~ ! 9 , Ordinanaofthe Runoff 1,83 inches Required Surface Arta 50644 sf ~ i
Standard S ificatons and Constriction Details and the Unified Development Ordinance of th - Pce ~~LS Runoff Yolume - 41186 cf Surface Area Provided 5650 sf
- - - - - _ _ - Town of A x. However, this signature does not constitute a variance from any requirements pe x. The
- ntained in an federal state, or local code, law, specification, Wile or ordinance. The co y - _ - nts.
_ develo rlen ' eerl contractor is solely responsible for meeting all applicab a regwrements. Pe Bin - - - 390 60 30 IS 0 30 60 100 50 25 0 50 100 '~l` N .,tio
~~G'~AC r C~~.~`~
390 - .~y~~ll1ri111111~~x`•
GRAPHIC 5CALE GRAPHIC SCALE
p+pp 1+00 2+00 3+00 4+44 BY: Date:
REVISED
1 LE PRIESTCRAVEN & AsSOCIATES,INC.
SEAGROVE'S FARM S"'`E: AS 5H" PLAN t PROFILE L N.C. 27609. Phone [phone]. Fax [phone]. Email [e-mail] 42
SINGLE PN11LY t TOWNHOUSE SUHDIVI51ON LMD POND # 10 AND USE CONSULTANTS PLANNERS ILANDSCAPE DESIGNERS / SURVEYORS l ENGINEERS 3503 - B Computer Drive, Smote 104 Raldgh,
PRELIMINARY NOT-RELEASED FOR CONSTRUCTION
F DATES DECEMBER 1, 2005 EXTENDED DETENTION WETLAND ILELIA S. WOMBLE GHRITABLE TRUST APEX, NORTH CAROLINA PROJECT: 2002-024.001

3'tOt~ ~ ~~h ~ I
- ~ .1...-' I I 1
/ ~
I ~ ~ ~ MH#24 _ ~ \ HANDWHEEL
l 1 ~ . ~ \ ~ ~ ~ I4 REBAR ~ C'° ~ i I4 REBAR ~ 1 GI #72 ~
/ ~ ~ ~ ` ~ - m ~ - ~ i
~ ~ - _ TRH TRASH RACK ~ X
~ ~ , ~ GI #71 , i Qb
(,1 GI#73
, I ' , ~ ~ ~ ~ _ _ I ~ _ \ _ ~ ~ PDT ~ 2
i / ~ ~ 24 _ _
~ _ ~ ~ . \ ~ _ _ _ ~ - - - N
~ HI H MA SH ~ ~ 0 ~ Q d 24
S6 ~ / i 0 ~ a / ~ . mow. ~ m ~ ~ _ ~ _ a Q ~7 a - ~ ~65AGITARIA LATIFOLIA-141
E . =4 X8.50 F - X999 ~ 5F ' 856 \ ~ / ~ I \ ~ O _
- NYh~HAEA OOORATA-3
f / ! I / ~ ~ ` / / ~ / ~ ~ a a MH#24
/ / / / ~ a / / \ \ _ _ _ _ _ WATER DUALITY ORIFlCE a yz
/ ! ` I ~ - - - ~ -RETAINING WALL _ / / / B56 SP \ d
~ _ - JUNCUS BIFLORUS-152
/ / / _ _
a ZIZANIA AQUATIGA-351
~ / / ~ _ - - ~ - 1 LF 1" INVERTED PVC ~ / / / a HTht:NOGALLIS GARALINIANA- SAURURUS GERNUUS-133
/ / ~ ~ / - - _ SIPHON PIPE ~ / 2 X ~ Y I NLE~ ~ i ~ W/ ~TRAS RACK / / ~ -
/ ~ ~ ~fD, NO.~ . 02 / PELTANDRA VIRGINIGA-108 CANNA FLAGU DA-3 OUTLET PIPE
/ / / i i ~ i
/ / / / a '
/ i i . i ' , - - - 4"PLUG VALVE 4 / / i a a ~i
r / RET N I NG,I~ALL i ~ _ - - ~ ~ PR I UATE / FOREBRY
~ ~ M-I~!f`cf11 ' ~ n f''~'~~i''';i~~'i~~ I ANI T Z Z A AG~1A IGA-381
r---'', ~ EA EI~NT
~ ~ ~ N~,, _1 \ SPl LLWAY MI GRO
a ~ OOL SAGITARIA LATI IA-I
111, - ~ ~ ~ 1" T".. F F 4 DIP B INVERT , ~ ~`j 2 L 0 FOL 08
, ~ ~ _ 2: I TOP OF BERM ~ ! ~ , GI
i M y \ - - _ ~ - , 2 X 2 YARD INLET W/ TRASH IZ . ~ .F + , ~ ~ EL, -425.00 24 GMT' ~ULI~ 8R15 z , SLOPES , TR~tSH R~GK
. r _ _ _ - ~ ~ = 5-~+ - STANDARD DETAIL 5.02 / ~ ~ IN / 5.02
/ , , , , ' (~j ~ _ . . ti ~ - \ FOR INVERTS AND ELEVATIONS SEE PROFlIE TENS SHEET RlE TENS SHEET
r` , ~ cn ~ ~T=39.4 ~ ~ ~ / ~ I ~ NOT TO SCALE ~ _ / i
I / / / / ..~G ~ Jam.. ~~...f ~
/ i / /
tOP OF D,W
- 424.50
N 1 N ~ ~ EMERGENCY J I _ 4z~~o Plant List - StOrmwater Wetland
0 1~. . i ~ ~ ~ ~ 1 ~ J I ~.t.` "`~,P,, ~ ~ 3 3 SPILLWAY
~mg °y' PANIGUM VIRGATUM-253 n GANVA FLAGGIDA 6oLDat cAwIA 3' ~ IRIS V I RGI N I GM45
RIP-Rhf RIP-RhP 233 PANKUM vIR6AnMf 9Y~YTGH6RA96 3' ~ ~ ~ ~ ~
19.5 ffYAENOGALLl9 GAROLINIANA 5PID62 LILY ID" ~ ~ I~
- - _ •,i ~.,r-, , 45 IRID wRDINIGA 811E FLAG IRIS CANNA FLALGI DA-3 - Y ~ PELTANDRA V I RGI N I GA-98 zoo .uwus eIFLDRUS SfIoRE RUSH z' JUNLUS BI FLORUS- 158 -
OVERFLOW SPILLWAY DETAIL M~i: - DET~ ~ L z -l7 NTMPhiAEA ODIDRATA-4 7 NYhPFWEA ODORATA FRA6RANf WkTER LILT 3~ SNJRURUS GERNUUS-9O
- - - NOT TO SCALE o - zoD PlLTANDRA vlRfaYtIGA ARROY) ARI,M CANNA FLACGI DA-5 - PONTEDER I A LORDATA-4A9
M4 P~oNTBDERIA coRDAiA Pk,KpR~ r~ ID' ~ <
D/~bIT7ARIA uT~oLIA BROADLFJIF ARROYlIEAD ID' 3 zl2
- ~ 5M1RIA015 G~1Y15 LIZARD5 TAY. 2' qq bGIRPU3 PIIN68N9 BULRUSH ID'
- m - - - _ OUTLET DEVICE INFORMATION ~ r s , 732 SITAIYA AOYMTk:A WLD RIG! ID' "
F 440 2' X 2' riser w I th a 12" RCP Barre I r~rr ~~t..
440 ~ - 30 foot ri ra lined secondar s Illwa -T TRACTOR SHALL SEED AND H ~ ~ HE LON MULL ALL BARE AREAS NOT COVERED BY PLANT r„~ MATERIAL AFTER CONSTRUCTION IS COMPLETE, SILT FENCE SFIOULD REMAIN IN PLACE
(Y r DrawdowPtime from falling hyeadporifi~e 3.6 days Normal Pool Elevation 419.00 ' UNTIL GRASS HAS BELCt9E ESTABLISHED.
_ . J ~ Tap of Water GLality Pool Elevation •421.60 -SGIL DtPTH MINIIM,IM SHALL BE A'~.
~ 2'X 2' TARO I T - Principal Spillway Elevation 421.60 pRpPp~p 2 Year Water Surface Elevation 421.76
_ 10 Year Water Surface Elevation 423.13
L 60 Emergency Spillway Elevation 423.50 ICO year Water Surface Elevation 424.00 AffiTRALT PRIEST, CRAVEN E RSSOC I RTES, INC.
D(ISTIN6 Top of Berm Elevation 424.50 LAND USE CONSULTANTS This analysis was conducted in order to comply with the City of Raleigh stormwater management 3808-B COMPUTER DRIVE, SUITE 104
requirement of limiting the post development runoff to that which would hove occurred under RALEIGH, N, C. 27609 pre-development conditions during the two year design storm,
- ~ ~ - ~p Forebay Elevation 416.00 _ _ _ - - _ - - - - H i qh Marsh E I evat i on 418.50 HYDROLGGIG DATA SEAGROVES FARM
I •G N ~ ~ ~ Law Marsh Elevation 417.50 HYDROLOGIC ANALYSIS CENTER STREET, APEX FILE NAME : SEAGROVESFARt~4.l DRAINAGE POINT 10 - POST DEVELOPMENT DATE ; NOV 21, 2005
- v ~ Micro Pacl Elevation 416.00 430 ~ ~ ~ ~ ~ The rational formula was used to determine the expected peak discharges for each set of conditions. The
~ QI = x x Water qua I i ty poo I drawdown orifice d I am I, 5 i n time of concentration was determined using the Kirpich Equation. The storm hydrograph and the time to WATERSHED LAND USE DAIA peak of the hydragraph were determined in accordance with the Small Watershed Hydrograph Formulation
~ ~ - Method outlined in H. Rooney Malcom s 'Elements of Urban 5tormwater Design'. TRACT DESCRIPTION SOIL C. AR N0. GROUP
27, CO LF - Runoff volumes were determined using the Soil Conservation Service methodology as outlined in NEH-4.
- _ ~ ~ ~ Id I BUILDINGS AND STREETS B 98 0.95 3.00 Dn, v Runoff coefficients and curve numbers were taken from standard values based on land use in accordance 2 LANDSCAPE AREAS 0 61 0,35 4, 3Z
- REVIEW CERTIFICATION BY THE TOWN 4F APEX ~tL.A with Chow, Ma I cam, and NEH-4 3 UNDISTURBED 6JpCAJED RREAS B 60 0.20 0, CO
8' ~ 8' ~ ~ ~ L ~=9292_ Hydrologic soil groups were determined based an the Wake county Sail Survey and the soils information TOTALS AND COMPOSITE NUMBERS 76.2 0.60 7.32
~ ~ - , _ This drawin has been reviewed by the Town of Apex, and to the best of m knowled a and ~ I 10 YR. WATER SURF EL, -429.06 g Y g nowledgeand contained in NEH-4.
- ~ - ~ ~ 2 belief, conforms to the requirements established in the Standard Specifications of the Town of i Of t)1e Town Of Rainfall intensities were taken from National Weather Service data complied by Malcom in Exhibit 2 of TIME OF CONCENTRRTION 'Elements of Urban 5tormwater sign".
- - - - ~ - - LIT A .However tibia si does not constitute a variance from an re irements containe u ~ ~ ~ _ P~ Y tN ;mentsCOntalned By TR-55 methodology, printout attached 0, 19 HR
420 ~ - - - - 420 in any federal, state, or local code, law, specification, rile or ordinance. The developer/engine leVelO er~en need topographic Information used in determining drainage areas and hydraulic lengths was taken from the 11.4 MIN p ~ City of Rale{gh 615 data,
' ~ contractor is solely responsible for meeting all applicable requirements. c, ~ ~ l i ~ NORP'NL EL. =4 19.00 RUNOFF AMOUNTS
Determine runoff volume from S. C. S, procedures PRIEST, CRAVEN E ASSCCI RTES, I NC,
n F- ~ - - By; Date: LAND USE CONSULTANTS linch storm
• ----t z z - - ` 3806-8 COhPUTER DRIVE, SUITE 104 Rainfall I ~ inches RALEIGWi, N. C. 27609 CN 76.2
CLASS B I HYDROLOGIC DATA From Buildings and Streets 8613 cf
_ SOIL EROS ON AND SEDIMENTATION CONTROL SEAGROVES FARM Fram Landscape Area 199 cf CENTER STREET, APEX FILE NAME : SEAGROVESFARMD4.1 Fram Undisturbed Wooded Are 0 cf
~ _ - _ ` CERTIFICATION BY THE TOWN OF APEX DRAINAGE POINT IO - PRE DEVELOPMENT DATE NOV 21, 2C~
1,5'DIA. ~ -QRQTEGTl~hl --W11'~~l - - - - - ` ~I Average Runoff = 0.332 inches WATERSHED LAND USE DATA Total Runoff Volume = BBIZ cf
_ - _ _ D 50= 13' , This drawin has been reviewed b the Town of A ex and to the best of m knowled a and - - - DEPTH=22 ~ g Y P Y g nowledgeand rRACr DESCRIPTION solL c. AR 2 ear Storm
belief conforms to ~ 4 I Q the requirements established in the Soil Erosion and Sedimentation Contra Y entation Control N0. GROUP 24 hour, 2 year ra i of a I I 9.60 I nches
410 Ordinance of the Town of Apex. However, this signature does not constitute a variance from CN 76.2 I variance from I B.1I LDI NGS AND STREETS B 98 O. 95 0. I6
- - ~ --t any requirements contained in any federal, state, or local code, law, specification, rule or on, rule or 2 CLEARED FIELDS, PASTURE B 69 0.35 0.27 Runoff = 1.449 inches 3 ROW CROPS B 75 0.45 1.29 Runoff Volume = 38507 cf
ordinance. The develo er(en ' eer/contractor is solel res onsible for meetin all a licable - e P 8'm Y P g PP gall applicable 4 UNDI STUBBED WOODED AREAS B 60 0.20 5.40 10 year storm
_ _ requirements. - I TOTALS AND COMPOSITE NUMBERS 63.9 0,27 7.12 24 hour, 10 year rainfall 5.38 Inches
_ _ u24' _ _ THIS SIGNATURE DOES NOT CONSTITUTE PLAN APPROVAL, ONLY PLAN ~wr I - REQUIREMENTS. A SEPARATE LETTER OF PLAN APPROVAL WILL BE MAILF LY PLAN cN 76 2
LL BE MAILED TIME OF CONCENTRATION Runoff = 2.87 inches
_ _ TO THE FINANCIALLY RESPONSIBLE PERSON AT A LATER DATE ACCORDIN g - - E ACCORDING Runaf f va I ame = 76177 cf 8y TR-55 methodology, printout attached 0.26 HR 15.6 MIN Na11NN11N~/p/~
ry ~ ~ TO THE CONSTRUCTION SEQUENCE. _ 110, 00 LF a~ ca R ~ ,o~,
z ~ ~ , e~- By: Date: - - RUNOFF AMOUNTS DETERMINE THE ANTICIPATED STGRAGE VOLUMES ~ O~~ $ p ,ti =,Q~
- DEPTH=22' - z = z STONE - B 400 Determine runoff volume from S. C. S, procedures Water CLality requirements mandate control of the
400 - - - ~s runoff from the I inch storm, 8812 cf ~ = 58 2 year Storm Town of Apex Ordinances ,
- io REVIEW CERTIFICATION BY THE TOWN OF APEX r 24 hour, 2 year rainfall 3,60 inches ~ L~
- - PUBLIC WORKS AND UTILITIES 5 L LN 63.9 mandate control of the 2 and 10 year sto 28991 cf
EXTENDED DETENTION WETLANDS SIZING CALCULATIONS ~If Q`~'~ Runoff = 0.752 inches R'~nn++` Q, ~
. Runoff Volume 19438 cf qy ME Size an extended detention wetlands to treat the runoff from the site, ~~Nt~NNNNMNd
z_ z - - This drawing has been reviewed by the Town of Apex Public Works and Utilities Department leS Department 10 year storm Normal ool de th 3 feet 24 hour, 10 year rainfall 5.38 inches p p ~~~111111111~/~
and to the best of my knowledge and belief, conforms to the re uirements established in the q ~liShed in the CN 63, 9 Impervious cover percentage of the tract 0.41 ~ ~~a CA Surface Area to Drainage Area Ratio 1.77 5~ ~I
- Standard Specifications and Construction Details and the Unified Develo went Ordinance of t P t Ordinance of the ~ ~/,f'~i Runoff = 1.83 inches ~ ~ /y'
- - Town of Apex. However, this signature does not constitute a variance from any requirements uirements Required Surface Area 0, 13 ac ~ ~ 9 Y ~ Runoff Volume 41186 cf 5644 sf ~ ~
_ _ _ - _ - y , p a on, Nee or ordtnance. The contained in an federal state or local code law s ecific ti ' lCe, The Surface Area Provided 5650 sf
- developerlengineer/contractor issolelyresponsible for meeting all applicable requirements. 390 390 requirements. ~ 6
60 30 15 0 30 60 100 50 25 0 50 IUD i ~
~'..'yn. N
v o w w ~ I
pp~ F GRAPHIC SCALE lf~flif%%~~ GRAPHIC SCALE
REVISED
PPTEST CRAvEN & AsSOCIATES 58
SEAGROVE'S FARM "5 5"OW " PLAN t PROF ILE I LE 9 INC. LMD POND # 10 LAND USE CONSULTANTS PLANNERS /LANDSCAPE DESIGNERS/ SURVEYORS /ENGINEERS
51 NGLE FAMI LY t TOWNHOUSE SUBDI VI 51 ON DATE: DECEMBER 2~ EXTENDED DETENTION WETLAND
3803 - B Computer Drive, Suite 104 Raleigh, N.C. 27609. Phone [phone]. Fax [phone]. Email [e-mail] 421
LELIA 5. WOMBLE GHRITABLE TRUST APEX, NORTH CAROLINA PROJECT: 2002-024.001
PRELIMINARY NOT-RELEASED FOR CONSTRUCTION

r. I I 1 ? 1 - CI #64
I I ~ 135 ' 1 I I I ~ 1 I I 1 ,
I ~ I~ 1 1 I I 1 0 1 1 X00 SF I 1 1 1 1 1 ~ - _
1 I 1 I ~ _ EL. -417.00 I 1 1 I~ 1 c \ ~ HANDWHEEL 1
I C I # 6 ~ HIGH MARSH REeAR ~ ~ ~ 1
I I I I• I ~ I 1. ~ ~ , PES# 62 ~ 1.4004~b r
I ` ~ 1. ~ ~ _ TRASH RACK I , EL. -419.50 M{A1
~ ~ I 4
LOW MARSH ~ 1 - ~ I ~ I / 1
1 1 1 ~ `t~OO SF 1 1 ~ S III , i
I I I I, EL. =419.00 ; 1 I I Z JUNGUS BIFLORUS-127
~I , I ~ al I - _ 2- k 2 YARD INLET - ~ ~ SAURURUS GERNUU9-71 d ~ '
~ 1 ~ a 1 I~ 1• I ~ ~ _ W/ TRASH RACK 4 ' CANNA FLAGGIDA-3
I I I I ~ ~ a I j I I• I I ~ STD. N0.5. 02 a
ry ~ ~ , 1 1 I i ~ - _
1 I E I MH# I I MICRO POOL a '
• I I :I I I I I % ' ~ 600 SF
. I i I I ~ I ~I _ a I~' ' 4 ~ WATER OUAIJTY ORIFICE a • O l D
I ~-I I ~ ~ I D Q I I 420 ,
CANNA FLACGIDA-3 LOW SAGITARIA LATIFGLIA-53
I I 1 ~ . ~ HThHJOCALLIS LARfJLINIANA-121 PELTANDRA VI RGI N I GA-85 MARSH ;
• I t I I 1 I I 1 1 a a 1 I IRIS VIR6INILA-24 SGIRPUS PUN6EN5-31 %
I .I z I 1 I 1 ~ a ZIZANIA NQJATIGA-301 ~
I ~ 1. 1 1 1 ~ 1 lF 1 INVERTED PVC a I RETAINING WALL SIPHON PIPE I 1 ~ a ~ CANNA FLAGGIDA-4 PANILUM VIRGATUM-115
I ~ 1 , FOREBAY
I I ' I I I OUTL ~ I : I I TOP OF BERM OUTLET PIPE
I ~1 ~ I I I i a • 'H ~ ~ ~
1 q i I• I I EL, =424.50 . 1 1 I \ \ 1/~ 4 PLUG VALVE 4 a ~ M _.RSH
1 ~ I I l ~ ~ ~ l 1 1 I I ~ \ \ ~
1 1 I a I ~ ~ r. 1 1 1 y ~ ~ ~ ~ ~
I• 1 1 1 ~ a v # 68 ~ \ • 4 . 10
y ~ \ ~ ~ ~ as ~ a a
~ ~ ~ ~ \ a a ~ ~ HYhfNOGALLIS LAROLINIANA-104 ~ \
' ~ SL~~S r ~ ~ \ \ ~ ~ \ 2 lF OF 4"DIP 0 INVERT PANIGUM VIRGATUM-93 \
' \ \ \ ~ ES L SA6ITARIA LATIFOLIA-107 - ,
~ ~ ~ ~ ~ PP I V~.T _ ~ r ~ ~ \ ~ ~ 2 X 2 YARD I W/ TRASH RACK y f rl\ ~
• \ ~ ~ ~ ~ ~ STANDARD DETAIL 5.02 v EP~SEM~~~~T ~ ~ ` ;
• \ ~ r ~ MER PIGY \ ~ • ~ FOR INVERTS AND ELEVATK)NS SEE PROFILE THIS SHEET ~ ~ ~ AURURUS GERNUUS-97
~ v v ~ SP1 t1.WAY ~ 1 v NOT TO SCALE NYhF'HAEA ODORATA-5
.Ili ~ ~ . , , ~4n~ ~ PONTEDERIA GDRDATA-238
RI VI R6 9 CANNA FLAGGIDA-4 IR 5 PUN NS-68 ZIZANIA AQJATICA-249
N I 11 I N I 9p' - 42450 - 42450 J NGUS IFL 4b PELTANDRA VIRGINIGA-43
~ ~ ~ ~ . I~ J I - 42350 q3b SA6ITARIA LATIFOLIA-76
3 3 _ I 42350
0 - P - last List Stormwater Wetland
- - - RI P RAP ~ araay carlr~ Ila~r >x~c w~. oc.
I . PR I ~ ATE
DI\(1 k DA GOLDEN LANNA 9' EMERGENCY N R6E PAw~ 9NMTLHGRA99
Pt f , - _ _ OVERFLOW SPILLWAY DETAIL a, SP I EASEMENT IL,.I~IIAw, SPIDEItLILY Ig" LLWAY 90 IR15 VIRGINIGA BLUE FLAG IRIS Ig«
NOT TO SCALE • Y15 JIMtu9 BIFLORU3 SHORE RUBH y
S NYMNAEA ODORATA FRAGRANT HATER LILY B'
120 PELTMDRA VIRGINILA ARROW ARUM Ig«
_ _ GiJTLET DEVICE INFORMATION 238 PONTEDERIA LORDATA Pk"I~RB, WEED 10"
2' X 2' riser w i th a 12' RCP Barre I and b" restr i ctor 236 OAGITTARLA LATIFOIJA BROADLEAF ARRO}VIffAD 10" t Or 100 ~ LIZARD5 TAB 2'
440 440 30 foot rip rap lined secondary spillway 99 SLIRPU5 PIIN6EN5 TlREE~GNJAFE 8URU5H 10"
~~p ~ Normal Pool Elevation 420,00 ~ ZIZArYA AgWTIG1 WILD RILE IO"
~D N To of Water Qualit Pool Elevation 421.50 - P Y NOTE. -THE CONTRACTOR SHALL SEED AND MJLCH ALL BARE AREAS NOi COVERED BY PLANT
v ~ V 4 2'X 'YARD INLET !Principal Spillway Elevation 421.50 2 Year Water Surface Elevation 421,80 MATERIAL AFTER CONSTRUCTION IS COM'LETE. SILT FENCE SH0.1LD REMAIN IN PLACE UNTIL GRASS HAS BECOME ESTABLISHED.
~ _ _ _ _ 10 Tear Water Surface Elevation 423.60 ABSTRACT -SOIL DEPTH MINIMUM SHALL BE 4•.
- ~ Secondary Spillway Elevation 423.50 T~~~ ~ 100 year Water Surface Elevation 423,96 PRIEST, CRAVEN E ASSOCIATES, INC.
_ Top of Berm Elevation 424.50 This analysis was conducted in order to comply with the City of Raleigh starmwater management LAND USE CONSULTANTS 9808-8 COMPUTER LfRIVE, SUITE 104 requirement of limiting the post development runoff to that which would have occurred under RALE16ff, N. C. 27669
- - -g - pre-development conditions during the two year design storm,
_ - - - - . - _ Fo r e ba y E I e va t i on 41 V. 00 g q_ P_ _ ~ - High Marsh Elevation 419.50 HYDROLOGIC DATA SEAGROVES FARM HYDROLOGIC ANALYSIS CENTER STREET, APEX FILE NAME : SEAGROVESFARMD4,1
" ~ ~ N Low Marsh Elevation 418.50
- -1--- - - - - 1 ~ u _ - - - _ 430 Micro Pool Elevation 41 C0 430 M W The rational formula was used to determine the expected peak discharges for each set of conditions. The DRAINAGE POINT 8 - POST DEVELOPMENT DATE ; NOV 21, 2005 time of concentration was determined using the Kirpich Equation, The storm hydrograph and the time to WATERSHED LAND USE DATA
Water quality pool drawdown orifice diam I.0 in i peak of the hydrograph were determined in accordance with the Small Watershed Hydrograph Formulation
- - Gyawdown time from f a I I i nq head orifice 4, 3 days Jy5 Method outlined in H. Rooney Malcom s "Elements of Urban Stormwater Design", TRACT DESCRIPTION SOIL G. AR N0, 6ROl1P
- - - 27,00 LF - - - I _ Runoff volumes were determined using the Soil Conservation Service methodology as outlFned in NEH-4. _ I BUILDINGS AND STREETS B 98 0 95 1 81
-18'_R6P--_ -~1 - ~ - - z 10' ~ Runoff coefficients and curve numbers were token from standard values based on land use in accordance 2 LANDSCAPE ARFAS B 61 0.35 3.29 with Chow, Malcom, and NEH-4. 3 UNDISTURBED WOODED AREAS B 60 0,20 0.~
~ 0.74x _ _ v,.-- _ - - ---TaP--o~ Rrr ~l. =43.4:-~ REVIEW CERTIFICATION BY THE TOWN OF APEX Hydrologic sail groups were determined based an the Wake County Soil Survey and the soils information TOTALS AND COMPOSITE NUMBERS 141 0.56 5.10
contained in NEH-4.
_ _ _ _8_~_~__ _ _ _ _ _ TEB. EL. • id Rainfall intensities were token from National Weather Service data complied by hlalcam in Exhibit 2 of TIME OF CONCENTRATION
S _ _ ~ 5PI r EL. =43.00 This drawin has been reviewed b the Town of A ex, and to the best of m knowled a and ' --3- - g Y P Y g 'Elements of Urban Stormwater Deslgn•. 1 Of By TR-55 methodology, printout attached 0.21 HR
EXISTING (,e belief, conforms to the requirements established in the Standard Specifications of the Town of ~ • ~ Apex. However, thus signature doeg not constitute a vanance from aay requu~ements contained lIled Topographic information used {n determining drainage areas and hydraulic lengths wos taken from the 12.6 MIN
. 420 in any federal, state, or local code, law, specification, rule or ordinance. The developerlengineerl City of Raleigh 615 data. neerl RUNOFF AMOUNTS
420 NoRrw. 430 00 contractor is solely responsible for meeting all applicable requirements.
- - Determine runoff volume from S.C.S. procedures PRIEST, CRAVEN E ASSOCIATES, INC.
- - - ' D te: - - - - _ - - - - B a ~ Y~ LAND USE CONSULTANTS linch storm _ 3808-B COMPUTER DRIVE, SUITE 104 Ralntall I~00 inches
RALEIGh, N, C. 27609 CN 74.1
~ _ _ _ - - ------k- - - - HYDROLOGIC DATA From &~ildings and Streets 5196 cf SEAGRWES FARii From Landscape Area 152 cf
I'DIA. ~ WATER l>X1AL I TY SOIL EROSION AND SEDIMENTATION CONTROL CENTER STREET, APEX FILE NAME : SEAGROVESFARMD4.1 From Undisturbed Wooded Are 0 cf
s - - G ASS B ~ - - - CERTIFICATION BY THE TOWN OF APEX DRAINAGE POINT 8 - PRE DEVELOPMENT DATE : NOV, 21, 2005 Average Runoff 0.289 inches
«o rv RIP-RAP WATERSHED LAND USE DATA Total Runoff Volume = 5348 cf
N H LET---- ~r 1 ~ ~ - - - - - - - - - This drawing has been reviewed by the Town of Apex, and to the best of my knowledge and TRACT DESCRIPTION SOIL C. AR 2 year storm d N0. E~ROl1P 24 hour, 2 ear rolnfal I 3.60 inches
- _ ~ _ _ D 3 _ ~ _ _ ~ . belief, conforms to the requirementsestablished inthe Soil Erosion and Sedimentation Control y ltr0~ CN 74.1
410 410 H=zZ I - - , Ordinance of the Town of Apex. However, this signature does not constitute a variance from 12111 LDI NGS AND STREETS B 98 0.95 0.00 IITl 2 CLEARED FIELDS, PASTURE B 69 0.35 0.00 Runoff = 1.318 inches
- - - - any requirements contained in any federal, state, or local code, law, s ecification, rule or 3 ROW GRGPS B 75 0.45 0.00 Runoff Volume = 24394 cf 4 UNDISTURBED I~ODED AREAS B b0 0.20 4.23
~ p ~ - - ordinance. The developer/engineer/contractor is solely responsible for meeting all applicable 11e 10 year storm TOTALS AND COMPOSITE NUMBERS 60.0 0.20 4.23 24 hour, IO year rainfall 5.98 inches
- _ requirements. CN 74.1
8' SS___ - _ - - _ - - - . _ THIS SIGNATURE DOES NOT CONSTITUTE PLAN APPROVAL ONLY PLAN , TIME OF CONCENTRATION Runoff = 2, b8 inches
RE UIREMENTS. A SEPARATE LETTER OF PLAN APPROVAL WILL BE MAILED Q LED R~naff Volume = 49664 cf By TR-55 methodology, printout attached 0.25 HR
_ _ _ TO THE FINANCIALLY RESPONSIBLE PERSON AT A LATER DATE ACCORDING - 12! 24 _ . ANTI- I N SE UENCE. ~IfVG 15. o MI N ,a~In1111U~jj,~
TO THE CONSTRUCT 0 Q _ - - 3~-- - - _ - RUNOFF AMOUNTS DETERMINE THE ANTICIPATED STORAGE VOLUMES ~ Q U u i r, //I
~ ry fALI.AR . _ By, Date: Water Quality requirements mandate control of the ~r Determine runoff volume from 5. G S, procedures 1i , ~ F' _ runoff from the I inch storm, 5348 cf ~ : w
J V - _ - - 400 M'i~
400 0 - ~e. ~ Town of Apex Ordinances = Q x : S 2 year storm i ~ 5U ~ 24 hour, 2 year rainfall 3.60 inches mandate control of the 2 and 10 year sto 26194 cf ~ `
IZ RGP 6 VT?P ~ CN 60.0 EXTENDED DETENTIGN WETLANDS SIZING CALCULATIONS ~
a $ - - - - - L= Ip, - REVIEW CERTIFICATION BY THE TOWN OF APEX . -z - -'S - - PUBLIC WORKS AND UTILITIES 'O - 4i~'~ ,I Runoff 0.575 inches ~y ~ Size an extended detention wetlands to treat the runoff from the site.
- . -STN-1~2--- - - Y --------Q - Runoff Volume = 8831 cf /Q~ii"'ii~~`A~~~ ~,pl,~q Y M`r~,a
z z Q STaNE - B Normal pool depth 3 feet ~~tl~~ 10 year storm Impervious cover percentage of the tract 0.35 %
- - ~ - ? D,o~6' This drawing has been reviewed by the Town of Apex Public Works and Utilities Department 2A hour, 10 year rainfall 5.38 inches ant CN 60.0 Surface Area to Crainage Area Ratio 1.53 (11111111 ,`~NI 11~1/i
,o- and to the best of m knowled a and belief conforms to the re uirements established ' y g , q m the Runoff = 1.53 inches Required Surface Area 0,08 ac CA RQ //o
- - - - Standard Specifications and Construction Details and the Unified Develo ment Ordinance of the a p f the 3399 sf /j D Runoff Volume 23470 cf Surface Area Provided 4000 sf Q~ ~ y
- - - - - - - - - Town of A ex. However this si ahue does not constitute a variance from an re ' ~ p gn y qutrements 1tS ~ ~ 9 i s •
z contained in any federal, state, or local code, law, specification, rule or ordinance. The
- develo r/en ineer/ contractor is solel res onsible for meetin all ' 390 ~ g Y P g applicable requirements. 390 • ~0 30 ~ s 0 30 6o I oo ~0 25 o So I oo ; 10 56
n~.rn i .gym ~+m ~+rt~ 4+~ R,,. n~~o. '%_ti .
GRAPHIC SCALE GRAPHIC SCALE I wo,f; 4 S w F F, G 1~~ ~~lllllllllll~l
¦ REVISED
¦
SEAGROVE'S FARM 5( &E. AS 5140" PLAN !PROFILE ¦ I PRIESTCRAVEN & 9 ASSOCIATESINC. N11 POND *81
SINGLE FAMILY E TOWNHOUSE SUBDI VI 51 ON DATE: DECEMBER 200 EXTENDED DETENTION WETLAND Pi LAND USE CONSULTANTS PLANNERS / LANDSCAPE DESIGNERS / SURVEYORS / ENGINEERS 42
LELIA 5. WOMBLE GNRITABLE TRUST APEX, NORTH CAROLINA PROJECT: 2002-024.001 3803 - B Computer Drive, Suite 104 Raleigh, N.C. 27609. Phone 919 / 781-0300. Fax [phone]. Email [e-mail]
PRELIMINARY NOT-RELEASED FOR CONSTRUCTION

~ ~ ~ I 410 ~ I I l i a I ~ ~ i ~ ~ ~ I I I
~ I I ~ 2 X 2, --YflRD" INLET v\ I I ~ ~ ~ I I LOPESI I \i \ I
~ ~ ~ I I ~ / TR o I I I I + W/ ,ASH RACK I I HANDwP~EEL ~ ~ m I I ~ I ~E: ~ I+ I ~ r \ ~ MI CH~L~, EaMO D J REeaR 3 41 U Z 1 ZAN I A AaunT l GA- ~ (j
~ PIN NUI~ 072 I I 0 0 I / O STD; NO. S, 02 1 I ;Na I zo~i . :tall TA-5 I O ~ i i ~ ~ N1~IPHAEA ODORA ~ I i I I -
I R N MERGENG SPIUL Y DEE BdOf\ 5 ~ I ' DEE P GE: pl ~q TRASH RACK PANIGUM VIR6ATUM-1~3 / 1 I
~ 3~1' i I I+ 1 I a I, PONTEDERIA ATA-145 IRIS IR6INILA-
I I I I i DES ! m + I ' ~ ! P I V TEI ~ . I I 5 I i I ~ ~ CANNA FLACGIDA- ~ l
D R I R6E I I~ _ ~ I I co ! ~ i, I ~ I ~ ~ , ¦I ¦
. , I _ ~ ¦ ~ i ~ I ~I I ~ ~ ¦ ~ ~ i ¦ ¦
t ~ E SE ENT I I ~ ~ ~ I I I ~ , ~ I ; H NODAL I S IIN I -248, I ~ ~~----I d' ~ AFL I DAB 5 I ~ ~ i. ~ H1'h~NOG L I S CAROL I N I A- 12 I
I ~ I I I I ' ~ I I- ~ , - ~ I ~N TbP OF BERM L, =41'9, 50 i ~ i I 1 I ~ ~ ~ , PELTAN VI RGI I GM238
1 I Q i ~ I a , p.~ . _ a I 1 ~ ` SA61 TAR U LAT I FGL I A- 35 I I ; I
1 1 I ~ I ~NGUS BIFLORUB-I i i
i 1 1 I I I I I 1 I I i i i I ,
1 I I ~ I I J 1 i ~ a 1 HIGH MARSH, 303 S / ~ ~ i ~ i
1 1 I t I r ~ I I I i ? I a i EL,=,412, ~0 I I a i 1 , I . I MI GR01 POOL....:.:.. ; ~ , , ' i
1 ~ I I I~ a t t 1 1 I I i ~ LOW M iY ? I WATER auauTr ORIFlCE a I y oaao. i JUN BIFLORUS-64
i i ~ I X44 F PORPl3A I i . 1 1 1 1 I ~ 3603 SF 144 5~ i $ ~ ~ 5GI RP~15 PIXNGENS-26'0
1 I s 1 I L=4.0.00 _ I I , 1 ~ i EL. -412, E . -410 Gb
1 1 1 ~ I I I i I ` ~ I I ~ 1 1 1 - I I I 1 1 t I I a i
1 1 I I -I--SL~ ~ ~ ~ - ' I 1 LF 1" INVERTED PVC i
I 1 1 2~ II I I i I i I I ° PP SAU RUS 'GERNUUS- 17 7 PIPE ~ ~ ~ ~ I
1 1 t I ~ E# 32~ ~ i i SIPHON PIPE ouT~T I E I 1 1 I 1 ,1 1 _ i I I t SLO~'ES I I a ~P ; H ALL I S CAROL I ANM53 ' ,
t 1 101X 2 1 1 I I I I I 1 % ~ i S RUSIGERNUUS-90 i I
I I ~ ~ ~ I 1 TOW 0 1 RPE I I a PEL~TMI `V I R61 N I GA-23 r T IA SAGITART LA IFOL F , I I
s I 1 1 I I ao~ IN A6A ODORATM3 I ''JUN S BI RORUS-83 - ~A~ I'~1EI~II
UT I I~ I TY H# 7 1 1 I I 1 I i I 4 PLUG VALVE Q a 1 ~ P.I ZMI ~ AQUATIIGA-4 ~ I, I ~ ~ T
1 1 1. _ _ _ L ~ I ~ t 1 1 t ~ - 1. ~GIRPU 'Pt1NGF.N~48 - I I ,
1 ~ 1 •1' • i SN~RURUS UU5~32 f - I I
1 1 1 \ I t ~ I i ~ .
1 I I t I.• 1 ° a a 1 5 HTMENOCALL 15 I N I,ANA-285 „ - - - ~ "I " ~ ~ ~ ~ '
I I 49+ 0 i - ~8+C0 ~ ~ I a a 1 I I 1 ~ to V A _I___---,r ~ ~ 1 ~ i I
I I i ~ ' ~ ~ 2 LF OF 4 DIP 0 INVERT ~ ~ I ,
I I . , ~ I I .r' ~ \ \ I I I ~ , ~ 'I~ SAGI ARIA LATIPOLIkl4 ~ ~ ~ ~ ~ I RFS VI RGI Nd.GA-5b i I ~ ~
. a I II _ HC ~ _ 2 X 2 YARD INLET HU TRASH RACK I 6 - - ,7- \ - I I .I• ~ I ~ _ ~ S I P ~ ~
I , ~ ~ I 24 ~ I STANDARD DFTA I L 5.02 I GI# 3 ~ I . I ~ ~ 1, I ~ I - - ~ ,r-
I I I I N \ \ ~ t .,~0~ ~ / I - ~ FOR INVERTS AND ELEVATIONS SEE PROFILE 1HIS SHEET i i 1 CANNA fI:AGGIDA-3 ~ ~ "I I , I p ~ ~ I i I ~
~ I I I I NOT TO SCALE I , l' \ ~ ~ I I I ~ I / ~ i 6 - - - - ~ I I -I
~ I ~ i ~ I I I MH# 44 'I' I I GI#34 1, I ~ i ~ i ~ / l ~ t ~ , ~ . i I 1
1 • 1 I I I I I _ I I \ i i , I I
.,n ~ , I I 1 • ' I I ~ \ i I ~ ~ roves ~ l~ I I ~ I • I ~ . I, IA I i ; ~ ~
O0' - 41150 l 0 \ I ~ I I i
IL_ II -416.00 ~ J I I~ i I l i 1 1 I '
P I N ~ Y ~ 3 3
~ Z ' yz Plant List - 5tormwater Wetland
~ RIP-RAP ~ ~ ~ o~,
IB 13 taro PLAGGIDA GOLDEN cAwa 3'
- - _ ~ ~ 1Y3 143 PANkUM VIR6ATIM 9YlTUI6RA99 3'
~ r~ - - - - - - OVERI=LOW SPILLWAY DETAIL ~~_~~~'f ~r"~t - - ~ 2 X 2 T- -INLET ~-wi~ IM TO'I HYhBIDGALLl9 GARDLIfNANA 8PI092 LILY ID' IM IRKS VKd61NNGA BLIk FLAG ~ 18'
- - - NOT TO SCALE 31Z 314 JJNGUS BIFLORUS 5fi0RE RV5H
n , t j~ i " ! f _ - TOP 414, 50 ° 8 NYMPHAEA ODOWkTA FRAGRANT MATER LILY 9'
468 FELTAHDRA VIR6INIGA ARROM ARUM ID'
_ 749 749 FONTEDERIA GORDATA PIGKER~.NFED 18' Iqq SAfaITTARIA LATIFOLU BROADLEAF ARROWEAD 18'
CUTLET DEVICE INFORMATION rya `A;Ai ggl SALWIRU5 L~115 LI4ARD5 TAIL 4'
~ ~ 2' X 2' riser w i th a 24" RCP Barre I ~ ~ scIRPU9 nr:s~-5 eu.r~s++ l6•
- ~ - 30 foot rip rap lined secondary spillway 430 1040 ZIIAHIA AQJAncA vaD RIDE 18"
430 - - ~ ~ Q r ~ r Normal Pool Elevation 413. C0 NOTE; -THE CONTRACTOR SHALL SEED AND MJLCH ALL BARE AREAS NOT COVERED BY PLANT
n ~ _ To of Water Qua I i fi Poo I E I evat i on 414.50 -THI ~ - - P Y m Principal Spillway Elevation 414,50 UN' MATERIAL AFT CANSTRUCTION IS COMPLETE. SILT FENCE SHOULD REMAIN IN PLACE
~ m - 2 Tear Water Surface Elevation 415, 13 UNTIL GRA55 HAS BECOhf ESTABLISHED.
- I~- v ~ - 10 Tear Water Surface Elevation 415,99 -50 ----gym N - N--- - - - - - - 8 _ ri _ _ Emergency Spillway Elevation 41b,~ -SOIL DEPTH MINiMJM SHALL BE 4".
- 100 year Water Surface Elevation 416.62 - - O r ~ r r
- Top of Berm Elevation A17.50
r ' - - Forebay E I evat i an 410.00 ABSTRACT PRIEST, CRAVEN E ASSOCIATES, INC.
_ Niqh Marsh Elevation 412.50 This analysis was conducted in order to comply with the City of Raleigh stormwater management LAND USE CONSULTANTS requirement of limiting the poet development runoff to that which would have occurred under 3808-B COMPUTER DRIVE, SUITE 104
- - Low Marsh Elevation 411,50 - MI cro ao I eves i an 410. pre-development conditions during the tuo year design Storm. RALEIGH, N.L. 27609
_ - - - - _ _ _ - 420 - HYDRGLIXiIC DATA
Water quality pool drawdown on ice diam in 420 - J - Drawdown time from falling head orifice 2.8 days HYDROLGIaIC ANALYSIS SEAGROVES FARM CENTER STREET, APEX FILE NAME : SEAGROVESFARMD4.123
- ---T9f? Off- €L-=41a~ 5A The rational formula was used to determine the expected peak discharges for each set of conditions, The DRAINAGE POINT b - POST DEVELOPMENT DATE : NOV 21, 2005 time of concentration was determined using the Kirpich Equation. The storm hydrograph and the time to
~ - - ITT y WNT R RF _~~=41~f , 60 t_ ~ - peak of the hydrograph were determined in accordance with the Small Watershed Hydrograph Formulation WATERSHED LAND USE DATA
---ti- - - - - 12' W. ~ I YR, WATER SURF =4I b, OI Method outlined in H, Raaney Malcam's "Elements of Urban Stormwater Dzsign°. TRACT DESCRIPTION SOIL C, AREA
` SPI Y EL.=416,00 8' SS ` Runoff volumes were determined using the Soil Conservation Service methodology as outlined in NEH-4. N0, GROUP RC.
- , - ~ ~ Z YR, WATER SURF EL. •415, 17 REVIEW CERTIFICATION BY THE TOWN OF APEX ~ Runoff coefficients and curve numbers were taken from standard values based an land use In accordance I EUILDIN65 AND STREETS B 98 0.95 5.49
with Chow, Malcom, and NEH-4. 2 LANDSCAPE AREAS B bl 0,35 8.24 3 UNDISTURBED WOODED AREAS B 60 0,20 0.55
- _ - - - ~ ~ NORPIAL =41 00 This drawing has been reviewed by the Town of Apex, and to the best of my knowledge and '+dge and Hydrologic toil groups were determined based on the Wake County Sail Survey and the sails information contained in NEH-4. TOTALS AND COMPOSITE NUMBERS 75.2 0.57 (4,28
- belief, conforms to the requirements esta 'shed in the Standard Specifications of the Town of e Town of
Apex. However, this signature ces not constitute a variance m any requu~ments contained Rainfall intensities were taken from National Weather Service data complied by Malcom in Exhibit 2 of s contained 'Elements of Urban Stormwater Design'. TIME OF CONCENTRATION
_ _ _ _ - - - 4 I 0 4 I 0 - in any federal, state, or local code, law, specification, rule or ordinance. The developer/engineerl per/engineerl Ta o ra hit information used in determinin dra ma e areas and h draulic len the was taken from the TR-55 methodolo rintout attached 0.17 HR p 9 P 9 9 Y 9 B`! qy- P
OO L _ contractor is solely responsible for meeting all applicable requirements. City of Raleigh GIS data, 10,2 MIN
3fr-R~- - - - - - - RUNOFF AMOUNTS
I~_II~ 50,OOLF - ~ - - - - --q - - - I ST I N6 BY~ Date: ~ 2 DIA t~12 PRIEST, CRAVEN E ASSOU RTES, INC. Determine runoff volume from S.L.S. procedures
- - - - WATER GMJAL I TY ANT I - LAND USE CONSULTANTS
---OR - - - _ _ COLLAR 3808-8 COMPUTER DRIVE, SUITE 104 linch storm RALEIGH, N. G. 27609 Rainfall I ~ inches CN 75.2
• SOIL EROSION AND SEDIMENTATION CONTROL CAS B " ~ CERTIFICATION BY THE TOWN OF APEX HYaROLCGIC DATA
SEAGROVES FARM From Buildings and Streets 157b2 cf CENTER STREET, APEX FILE NAME : SEAGRWESFARMD4.123 Fram Landscape Area 380 ct
- - - - - B 0.50x _ STOPS - CLASS B _ 'I CRAINAGE POINT 6 - PRE C~VELCf'hENT DATE : NOV. 21, 2005 Fram Undisturbed Wooded Are 35 cf
- - - - - ~ This drawing has been reviewed by the Town of Apex, and to the best of my knowledge and D~=I3' ;dge and WATERSHED LAND USE DATA Average Runoff = 0.312 inches
- ` belief, conforms to tike requirements established in the Soil Erosion and Sedimentation Control Total Runoff Volume = 16177 cf Ori COntIOI TRACT DESCRIPTION S01L C, AREA
400 oEpTH=Z~• Ordinance of the Town of Apex. However, this signature does not constitute a variance from ON fnce from N0. GROJP AC. 2 year storm _ 24 hour, 2 year rainfall 3.60 inches
=--s ~ - - - any requirements contained in any federa ,state, or local code, law, specification, rule or _ - Ile or I BUILDINGS AND STREETS B 98 0.95 0.16 CN 75.2
- - - - ordinance. The developer/engineer/contractor is solely responsible for meeting all applicable licable 2 CLEARED FIELDS, PASTURE B 69 0.35 O. BB Runoff = 1.385 inches 'pp 3 ROW CROPS B 75 0.45 0.00 Runoff Volume = 71798 ct
H ~ r - - - - - requirements. r 4 UNDISTURBED WOODED AREAS B 60 0.20 IA. 49
_ _ ~ - THIS SIGNATURE DOES NOT CONSTITUTE PLAN APPROVAL, ONLY PLAN z zz z ALAN TOTALS AND COMPOSITE NUMBERS 60.9 0.22 15.53 10 year storm 24 hour, 10 year rainfall 5.38 inches
- - - REQUIREMENTS. A SEPARATE LETTER OF PLAN APPROVAL WILL BE MAILED E MAILED cN 75.2
_ - TO THE FINANCIALLY RESPONSIBLE PERSON AT A LATER DATE ACCORDING CORDING TIME OF CONCENTRATION 1{11111111 Runoff = 2,78 inches a1a
TO THE CONSTRUCTION SEQUENCE. Runoff Volume = 143986 cf ~`CARQ By TR-55 methodo logy, printout attached O.OB HR ~ ~O ~u,,~~~ 4.8 MIN ~ 4p ,;V ,I~
- By: ate: a` ~.a ,9
390 RUNOFF AMOUNTS DETERMINE THE REQUIRED STORAGE VOLUME ~ ~ W ~
390 Determine runoff volume from S.C.S. procedures " ~ _ Water Duality requirements mandate control of the ;
- - REVIEW CERTIFICATION BY THE TOWN OF APEX runoff from the 1 inch storm. 16177 cf ~ ~ ~ ~ 2 year storm ~ . o v;
_ _ _ _ PUBLIC WORKS AND UTILITIES 24 hour, 2 year rainfat I 3.60 inches Town of Apex Crdlnances / 1 O,$
CN b0.9 mandate control of the 2 and 10 year eta 54041 cf LA n u ~p, /qYM ~
EXTENDED DETENTION WETLANDS SIZING CALCULATIONS ''~Rh Runoff = 0,614 inches n~~ Runoff Volume = 34614 cf
- This drawing has been reviewe y e Town o Apex Public Works and Utilities Department epartment Size on extended detention wetlands to treat the runoff from the site. IIIIIIIIIIIyy//
and to the best of m knowled a and belief conforms to the re ' ements established in the Y g ~ q~ d in the 10 year storm Normal oo l de th ~A/f0 ,~~t~ 24 hour, 10 year rainfall 5.38 inches P P 3 feet 0~
Standard Specifications and Construction Details and the Unified Development Ordinance of the finance of the CN 60.9 Impervious cover percentage of the tract 0.38 6 Q• Surface Area to LYalnoge Area Ratio 1.65 ~ '
- Town of Apex. However, this signature does not constitute a variance from any requirements 111rementS Runoff = 1,60 inches l
contained in any federal, state, or local code, law, specification, rule or ordinance. The ,he = Required Surface Area 0.24 ac 11 Runoff Volume 89939 cf 10264 sf
- develo er/en ineer/ contractor is solel res onsible for meetin all licable re uirements, 380 P g Y P g ~P q ~ements, Surface Area Provided 10275 sf ~ ~ 6
380 60 30 15 0 30 60 100 50 25 0 50 100 % ~
V 10%1
NHnu~N~~ GRAPHIC SCALE GRAPHIC SCALE
REVISED
SEAGROVE 1 S FARM 5`""E. '5 SHOWN PLAN !PROFILE E PRIEST.CR-A-VEN &AsSOCIATESIINC, 56
51 NGLE FAMILY ! TOMNHOUSE SUBDI VI 51 ON ATE: DEGEhMR I, Zoos EXTENDED DETENT ION WETLAND f I or- LAND USE CONSULTANTS PLANNERS /LANDSCAPE DESIGNERS/ SURVEYORS /ENGINEERS
3803 - B Computer Drive, Suite 104 Raleigh, N.C. 27609. Phone 919 / 781-0300. Fax 919 / 782-1288. Email [e-mail] 421
ILELIA S. WOhBLE GHRI TABLE TRUST APEX,NaRTH CAROL I NR PROJECT: 2002-024. 001
PRELIMINARY NOT-RELEASED FOR CONSTRUCTION

~~o
r
~K: I i l l r~ ~ / 0855 , r ~ ~ i PIN I~UM: 07 2 18~ 131 f: , i ~ HANDWHEEL
~E: 03,~~ 1 I ~ i ~ ~ ,I4 REBAR i iZ0 I N: R I I I r REBAR .
' ,.GLEMBOC~KI , THOMAS EL I Z E'~H--A--- DE€D--809K~-0~4-I- D~€Q--PB~E TRASH RACK TRASH RACK ! i ~ ~ ~ ~ /
~ I I I 1 _ I _ I I i 1 ~l~ ~ ~ ~ ~ ~ 1~1A5 r~ ~ E~ ~ ZRB~1`tt ~4-- - ~ ~ ~ ~ .~LE~~~oc~ ~ , TNT ~E~ ~~r a~a~~ -SEE-~ ~_~,~E. u ~
~ ~ ~ ! ~i : I i I ST , N0, 5, 2 YARD I NLFT W/ TRASH RACK ~ ~ , , ~ ~ , o ~ I¦ >I ¦ ¦ ¦ ¦
i , L/ / i / ~
~ , ~ ! I ~ ~ ~ 'MI GR0 OOL 548 5F EL, =43~. 00 ~ i ~ PRIVATE ~ i i ~ I )r / ~ / ~ ~ ~ l i r PA I NAGC~ / ~
3 I SLOPES / ~ i ~ ~ PRIVATE.
i ~ ~ ~ ~ ~ / ~ EASEMEI~ ~ r f ~ - H 1 GH MARSH / ° a ~ DRRINA~E ~ ,
i ! / i ~ i n~v a~ orH ~4 - 4~,~0 FES/ / a EASEMENT /
f 1278. SF, EL. =4~2.. 0 a ~ S 1 E ~ / ~ , / ~ / / ~ JUN 8 BIFLORUS- /
m ~ ~f ~ , / / / OW H I I ~ IRIS VIR6INILA-14 L J - / / 3 B ~ H ALLIS , INIANA-~2 A-A4 /
I l o ~ / J.. MA ~ ~ i, h? i , / , a ~ ~ , 1~7~ ~3F ~ ~ RPU M 5-11 ~ PELTANDRA VIR6INIG ~ / ~ 5 1NGEN /
~'i / I I EL. ~~2, 00 ~ CANNA H.AG~TDA-3 PAFIiGUM VIRGATUM-33 / RIP-RM P I GUM VI ATUM-12
I ~ ~p ~ l' N/ / ~ Dc~` WATER QUALITY ORRICE d ~ ~
l I > / / ~ ~ ! ~ ' V OVERFLOW SPILLWAY DFT'AIL o ~ ~ HIGH ~
~ / i / ~ ? / ~ / ~ ~ ~ ~ NOT TO SCALE ~ ~
~ ~ MARSH / / F v
a / ~ / , \
I ~ / , / i \ , ~ t LF 1 WVERTID PVC J ~ ! ~ / / / \ / 1 P ° a sAURURus G ~ / \ \ 117°5 SF
~ ~ ~ NGY / / / ~ I SIPHON PI E ~ I / E GE r d PELTANGRA VI R61 I UI- ~ % / / \ SAGI TART A LAT I A- ~ / \ '0.2 ~ A~
t ~ ;SPILLWAY, r / / ~ I OUTIET PIPE ~ CANNA AGGI A-4 . ' ~,GR / A ~
HT'hENOU.ILL 15 G i N I -89 / \ / POOL / \
I ~ u l ~ , r / 1 a ~ , v~ ~ ~
N , ~ 4 PLUG VALVE 4 a° S ,P GI \ S ~ IT IA LATIFOLiA-138 \
J 'V / E R ~ . ~ ~ N E ~ v U II S H I S G,1RQL. N
~ r . R ~P r , ~ ~ . I V ~ N TA-3
1 t 1 f , ~ ~ ~ 0 ? 3 Pic \ / PANT GUf4 ~9TUM-71 \
I F ~ ° u ~ ~ ~ ~ a a / ~ P / ~ • 1 A \ ' ZIZANIA I -340 ~Ba ~
~ ~ . A ~r ' \ L~ - ~MI VIRCiINIGM92 ~ \ ~IRPUS PU 76 Pfd \ ~
I i ~ ` ~ 1 2 Lf OF 4 OIP 0 INVERT I 1 i ~ ~ ~ ~ ~ i ~ S .IRIS VI I IGA- PONTEDERI GORDATA-278 \ \
~ l i ~i ~ ~ I i
2 X 2 YARD INLET W/ TRASH RACK I i / ~ ii / ~ ~ ~ / RACK IRIS VIRSlN1 -3 \ \ . A A ~ ~
I ~ , STANDARD DETAIL 5.02 . \ j ~ i r TOP O,~ qAM ~ ~ d' ~ I FOR INVERTS AND ELEVATIONS SEE PROFILE THIS SHEET GMlNA FLAGGI DA-3 V '
~f'ES ~L. =~13~. 50 N ~ \ ~ ~ ~ ~ / ~ 1 I NOT TO SCALE SHEET v v v ' ~ ~ / v ~ 92b SF `~y v . JUNGUS ~Ifi.01~,J5-83,, / v ~ ~
( ~ ~ \ 1 Plant List - 5tormwater Wetlar~ . ° / \ \ 0, 213 c \ v \ ;
I F AY ~ ~ / ~ I Y ~ B r i ~ r \ ~ ~ ~ ~ • o ~!I rraoai Maw su.*n~ aa~l. , \ \ \ e
5~$ SF / ~ / ~ ~ I / ~ b ~ / v i b GAlMA RAGGDA 601.DB-l GANIA 'J ~ ~ . \ ~ A / /
4.. OD i r G I# 18 I i \ ~ 225 PANftIM VIRSATUM 9YtlTGM5RA55 3' / \ ,A ~ .
r i r \ M RSH I r r Zn ~ MH# 46 23j itfhEflOGALl.lS GARDLRUAHA SPID'B2 LILY I8" r / \ / 68 Ntl5 VUi61NIGA BLIE FL4v IRIS \ \ \ / /
131 JJNCAl9 EN'LOPLS 6HDRE RUSH ~ / \ / . E 2'
~ ~ r~i 3 NYI+PHAEA ODDRATA f'RA6RAf11 WATBi LU.Y 9' \ \ / ~ Q
•t ! j N ~ N ~ ~ I W7 16'1 P9.TAPORA VUt61WGA AFROW ARUM IB' / ` \ \ / ; ~ ~
,T i ~ ~ ~ . ~ 21b 218 f~ONiEDERIA GORDATA f'IGKERPL W~ I6' J / \ \ / f ,
,7 ~ 204 5A61TTARIA LATIFOLIA eRON7LEAP ARROwfEAD le' ' 863 SF ~ 3~ nD BAVRURUS GERNUJ9 LIZP~D'8 TAIL Y _
°dt , 'vi; W7 141 9GIRfU3 PUY~HS THE-9CaUARE BU.RUSH 18' -
3~W .i V3~-. 3qp ZIZMIU+AQUA'nGA WILD RIDE U)'
~F NOTE: ~~C7v NOTE: -THE CONTRACTOR SHALL SEED AND MJLCh ALL BARE AREAS NOT LWERED 87 PLANT
_ -THE CON M,eTERI Al MATERIAL AFTER CONSTRUCTION IS COhPLETE. SILT FENCE SHOULD REMAIN IN PLACE
- - _ - - - - _ _ UNTIL Gf 4 UNTIL GRASS HAS BECOME ESTABLISHED.
460 -501 L DEf -SOIL DEPTH MINIMUM SHALL BE 4".
~ 2' X 2' Y INLET ABSTRACT PRIEST, GRAVEN G ASSOCIATES, INC. LANK USE CONSULTANTS
L V I I N hV1 This analysis was conducted in order to comply with the City of Raleigh stormwater management 3808-8 COMPUTER DRIVE, SUITE 104 7EVICE INFORMATION requirement of limiting the post development runoff to coat which would have occurred under RALEIGH, N.L. 21609
5._~2 _ - - - - - - - 8 TOP=434, 50 2' X 2' riser pre-development conditions during the two year design storm.
~y _ 30 foot rip rc 2' X 2' riser with a 12' RCP barrel and a b' restrictor rfYDRar~lc DATA 30 foot rip rap lined Secondary Spillway SEAGROVES FARM
N % ~ ~ \ a - - - HYGROI.WIC MlALTSIS CENTER STREET, APEX FILE NAME : SEAGROVESFARND4.I23
- _ Normal Pool EI P - _ m -F ~ - ~ To o f Wa t e r Normal Pool Elevation 433.00 DRAINAGE POINT 5 - POST DEVELOPMENT GATE NOV 2I, 2005 The rational formula was used to determine the expected peak discharges for each set of conditions. The Top of Water Quality Pool Elevation A3A. 50 time of concentration was determined using the Kirpich Equation. The scorn hydrograph and the tine to FUTERSf~ LMO USE DATA
n ~ @ ~ ` ~ rl ~ Pr i nc i pa I Sp i Principal Spillway Elevation 434.50 peak of the hydrograph were determined in accordance wit- the Small Wtershed Hydrograph Formulation
N N i ~ - 2 Tear Wafer - + # - A-. 2 Tear Water Surface Elevation 434.78 Method outlined in H. Rooney Malcom's 'Elenent5 of Urban 5tormwater Design'. TRACT DESCRIPTION SOIL C AREA N0. GROUP AC. 10 Tear Water Surface Elevation 436.4b Runoff volu~es were deter~ined using the Soil Conservation Service methodology as outlined in NEH-4.
~ 450 10 Tear Water 450 ~ ` ~ Secondary Spil Secondary Spillway Elevation 436.50 I BUILDINGS AND STREETS B 98 0.95 1.59
~ ~ i ~ ~ 100 year Water ~ Top of Berm EI 100 year Water Surface Elevation 436.91 fd~noff coefficients and curve nuabers were taken fron standard values based on land use in accordance 2 LANDSCAPE AREAS B bl 0,35 2.65 Top of Berm Elevation 437,50 with Chow, Molcoe, and NEN-4. 3 UNDISTURBED WOODED AREAS B 60 0.20 O.cYJ
r d~ - - _ - - - - _ _
v i Forebay Elevat - _ High Marsh Ele Forebay Elevation 430.00 Hydrologic soil groups were determined based an the Wake County Soil Survey and the soils information TOTALS AND COMPOSITE NUh13ERS 74.9 0.58 4.24
- - - - - Low Marsh Elegy High Marsh Elevation 432.50 contained in NEH-4. Low Marsh Elevation 431.50 Rainfall intensities were taken from National lather Service data complied by Malcom in Exhihit 2 of TIME OF CONCENTRATION
~ ~ Micro Pool Ele Micro Pool Elevation 430.00 'Elements of Urban 5tormwater L~sign
Water quality By TR-55 methodology, printout attached 0.22 HR Water quality pool drawdown orifice di am I, 0 in Topographic information used in determining drainage areas and hydraulic lengths wos token from the 13,2 MIN
Drowdawn Time Drowdawn time from falling head orifice 3.9 Boys City of Raleigh 615 data. RUNOFF AMOl1NT5
Determine runoff volume from S.C.S. proceduree
- - - -s, - - - - - - - REVIEW CERTIFICATION ~ - - 440 440 ~ICATION BY THE TOWN OF APEX PRIEST, CRAVEN E ASSOCIATES, INC. I inch storm LAND USE CONSULTANTS Rainfall 10J incites
TOP OF AM EL,=437,50 3808-B COMPUTER DRIVE, SUITE 104 CN 74.9 RALEIGH, N. C, 27609
- - - 10 YR. WATER SURF EEL, -436, 91 This drawing has een reviews y e Town o Ax - --T AAfiER-STIR E-EL, =43b, 55- the Town of Apex, and to the best of my knowledge and HYDROLOGI L DATA From Bu i I d i nqs and Streets 4565 cf
- - - - - ~ ~cP-e~~OZ - - belief, conforms to the requirements established in 1 From Landscape Area 122 cf I established lathe Standard Specificafions of the Town of SEAGROVES FARM Frain Undisturbed Wooded Are O cf
- - - --sett ~Et =436;-50- - - - 27, 00 LF 3 Apex. However, obis signature does not constitute t I not constitute a variance from an re uirements contained CENTER STREET. APEX FILE NAl E : SEAGROVESFARMD4 123 y Q DRAINAGE POINT 5 - PRE DEVELCPhENT DATE : NOV, 21, 2005 Average Runoff = 0.3~ inches
I a' - I ~ in any federal, state, or local code, law, specificatio: @ 0.74x aw, specification, rule or ordinance, The developer/engineer/ WATERSHED LAND USE DATA Tota I Runof f Vo I ume = 4687 cf
contractor is solely responsible for meeting all appl Heeling all applicable requirements. 2 year Storm TRACT DESCRIPTION SOIL C. AREA 24 hour, 2 year rainfall 3.60 inches
_--_.Y.-._. _ - - - 12 W. @ 8.88'L - - - - - - NORMAL P EL. =433.00 N0. GROUP AC. CN 74,9
- - - - - ~ By: Da Date: I BUILDINGS AND STREETS 8 98 0.95 0.00 Runoff = 1.365 inches
- - - - ~ I B' S5 2 CLEARED FIELDS, PASTURE B 69 0.35 2.14 Runoff Volume = '11009 cf 3 ROW CROPS B 75 0.45 0.00
430 4 UNDISTURBED WOODED AREAS B 60 0.20 0.85 10 year storm
430 SOIL EROSION AND SEDIM LLA55 B - - _ ~ - - - - - - - _ _ J AND SEDIMENTATION CONTROL TOTALS AND COMPOS TE 24 hour, 10 year ra i of a I I 5.38 Inches I NUMBERS 66,4 0.31 2.99 CN 74.9
- - - ~ ~ CERTIFICATION BY TF RIP-RAP ~ ATION BY THE TOWN OF APEX Runoff = 2.75 inches
I' DI Tlh>c OF CONCENTRATION Runoff Volume = 42319 cf
- - wAT Gi<1N.I TY - - _ _ _ _ This drawing has been reviewed by the Town of Ap _ _ belief, conforms to the requirements established in t ~ ao=1.3~ - - - -~R~P ----1 - the Town of Apex, and to the best of my knowledge and By TR-55 methodology, pr intact attached 0 17 HR
DEPTH=22' ANTI- established in the Soil Erosion and Sedimentation Control 10.2 MI N
Ordinance ofthe Town of Apex. However, this sigf ~wever, this signature does not constitute a variance from RUNOFF AMOUNTS
- - - - - - any re uireme~ contained in any federal, state, or r m L= I , 0' ~deral, state, orloeal code, law, specification, rule or Determine runoff volume from S.G.S. procedures DETERMINE THE ANTICIPATED STORAGE VOLUMES
- - --rT~;-oD-tP ordinance. The developer/engineer/contractor issol contractor is solely responsible for meeting all applicable Water Glaality requirements mandate control of the 2 year storm runoff from the I inch storm. 4b87 cf
~ _-a~Rl,~--- ~ - ~ requirements. - W b' RESTR GTOR 24 hour. 2 year rainfall 3.60 inches
• ~ - - THIS SIGNATURE DOES NOT CONSTITUTE 4 0 Z z 3b~-- D b~ CONSTITUTE PLAN APPROVAL, ONLY PLAN cN 4 Tawn of Apex ordi nancee
2 - - - 5 RE UIREMENTS. A SEPARATE LETTER O;H Q ° 5 9 F/S _ TO THE FINANCIALLY RESPONSIBLE PER! E LETTER OF PLAN APPROVAL WILL BE MAILED Runoff o. 878 inches mandate contra I of the 2 and I0 year Sts 20319 cf INSIBLEPERSONATALATERDATEACCORDING R~naff volume = 9528 cf sire an exfended detention wetlands to treat the runoff from fhe site.
- N - ------ti - _ - p. - - - _ UEN~'~',I, 10 year storm Normal pool depth 3 feet
- - - TO THE CONSTRUCTION SEQUENCE. m N 24 hour, 10 year rainfall 5.38 inches Impervious cover percentage of the tract 0.38 ~
- ; - - - - - - - - B ; I - y . CN 66.4 Surface Area to Drainage Area Ratla 1.65 Date:
- - z x - Z Runoff 2.03 inches Required Surface Area 0.07 ac Runoff Volume = 22000 cf 3047 sf
CARO Surface Area Provided 3650 sf
- - - REVIEW CERTIFICATION B' [FICATION BY THE TOWN OF APEX p,, S ,,,y
- _ _ - PUBLIC WORKS Al ~;~Q ,9 [C WORKS AND UTILITIES 9
x.
8 -
This drawing has been reviewed by the Town of Ap 410 the Town of Apex Public Works and Utilities Department
and to the best of my knowledge and belief, conforn _ _ _ _ - Standard Specifications and Construction Details an I belief conforms to the ' ~ ~ uunu~ requirements established in the a~~r, A oq4
.Ctl '~iiiiii~" Q ~ ~~tR ~~I on Details and the Unified Development Ordinance of the ~ ~P ~ OC[ q Y M p~
- - - Town of A ex. However, this si afore does not co - - p gn lure does not constitute a variance from any requirements FE ' 0
- - contained in any federal, state, or local code, law, sf - _ _ developer/engincerl contractor is solely responsible :al code, law, specification, rule or ordinance. The L
ely responsible for meeting all applicable requirements, 60 3o 15 0 30 60 I o0 so 25 0 5o I oo . 10 56
n~nn I 2+00 3+00 4+00 5+00 6+00 R~~ Wert Date' '~l,~ N ~ ,
/Ujooo P7r AV
GRAPHIC SCALE GRAPH 1 C SCALE ~i qS F CF~~~~ ///h11111111111,
REVISED -D T 55
SEAGROVE'S FARM SCALE: A5 5 PL/4N t PROF I LE E P,1,,.,ESTCRAvEN & ' AsSOCIATESINC.
of=
51 NGLE FAMILY e TOWNHOUSE suWi vi si ors DATE: DECEMBER I 2005 EXTENDED DETENTION HETLMD f MD POND # 5 LAND USE CONSULTANTS PLANNERS / LANDSCAPE DESIGNERS / SURVEYORS I ENGINEERS
LELIA 5. WOMBLE GHRITABLE TRUST APEX, NORTH CAROLINA PROJECT: 2002-024.001 3803 - B Computer Drive, Suite 104 Raleigh, N.C. 27609. Phone 919 / 781-0300. Fax [phone]. Email PriestCravengnc.rr.com
PRELIMINARY NOT-RELEASED FOR CONSTRUCTION

v ~ 1 ~ I I I ~ r ' _''~CI f
I I t ~ ; ~ ~ I I 1/
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1 1 1 ~ I 3~ I ~ I/ / T A Ht'rHJOGALLIS GAROLINIANA-42 ;i , ~
- -1- 1 1 ~ I I Sl_ ES i - 1 SA6ITARIA LATIFOLIA-73 ~ ALLIS GAROLINIANA-69
1 I , I HYMENOG IRIS VIR6INIGA-14 I i I
1 1 I -I I r ~ 1 I ~ Ei3 Y ~ ° I_ a SGIRPUS PUNGENS-98 PANIdUM VjIRGATUM-33
~ HC I I I 542 i 5 ° PELTANDRA VIRGINILA-90 I I ' FORE AY GANN ~ FL I DA-5 ° ~
/ a ELF =44 .'00 I ! L. , a I '~~r~ PELT DR>~ yl RGI N I GA-53
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1 I I I ~ ~ Iii / 1 ~ 1 EL . 446, 5Q ° ~ ~ / / / a I; ° ~
X 1 i . WATER QUALITY ORIFICE 1 1 1.- 1 L .I ~ / . j ° d ~ , ZANIA~~ ATIGA-295 a I; .r °
1 1 I I OW :MARS , 12 I / SF / / _ / ( 1 1 1 1 I ~ /
1 1 V 1 I 1 f I / / I i i I I 1 ~ I ,
i I I 1 1, / ~ / . - 1 I TQF' R~1 IEL. = 51.00 / i I ~ I a o•.; ~ NY A ODORATA 3
- - .I I I r / , a a I } •x;,l, IRIS VIR I~IIGA-31
~ 1 1 I , 5 , 2~ I ~ T / , 1 LF 1 ~JVERTED Pvc ° . I I I S~Q. N ARD I ~L~ / SIPHQN PIPE ° IRIS VIRGINIGA-80 I ~ ''i'' I I lJ,~ i SGI 5'PUIN6ENS-74
SI~pEWA 1 - I I ~ / a ~ I I W I T R SH R_ ~ / SAURU S' ~ERPIUUS-82
TYP) I I ~ I~ / / ~ ~ / OUTLET PIPE ~ 1,8
I ~
I I I I ~I~ / , / / / ° ~ 1 I I I_ ~ / 4"PLUG VALVE Q ~ HYhENOGALLIS GARCIINIANA-102 i''
I
1 1 / / 1 / I I I 1 O F ~ ~ l C~~ / PONTEDERIA G - i ORDATA 227 P D E ~ F
tN I , / , L PANIGUM VIRGATUM-76 j ~~j
I I I I ~ / / I I I I E ERG NGY ~I L bJAY NYMPHAEA ODORATA-3 JUNGU~ ~IFLORUS-76
IRIS VIR6INIGA-23 i
I / / a ~ N I M1-GR0 001- / / / a ' ~ I CANNA FLAGGIDA-3
i / / 2 LF OF 4"DIP O INVERT JUNGUS BIFLORUS-32 6 SAGITARIA LATIFCLIA-105
~ I 6 I 152 SF ~ / - I. 1 ~-1 1 , ~ ~ , I 0 ~ ~ 2 X 2 YARD INLET W/ TRASH I r SGIRPUS PUNGEIVS-b3 - ~
1 I ~ 1 EL. . 0 i i i I / ~ / I ~ i 6 1~ ~ ~ r./ ~ STANDARD TRASH R~4GGk j IRIS VIR6VNILA-8 i ~ I 1
1 , ~ I ~ DETAIL 5.02 ~ l(1 1 1 ~ I , ~ : ; /1 , / / I I ~ 1 1 I - ~ ~ FOR INVERTS AND ELEVATIONS SEE PROFlIE 1HIS SHEET L 5 . VL I 6~ ZIZANIA AtxJATILA-92 i \ iOFlIE THIS SHEET - I
1 ~ 1 1 1 1 ~Ip X / NOT TO SCALE I Plant LISt - Stormwater Wetland _ I -~Yr•~a S GAROLINIANA-38
1 I 1 r~ I i T i i i -k.i 1 ~ ' i -1 ~ ~ ~ i / I ~ - I Gplrlen Now EaMiNk Now ~ I ~ ~ ~ 5 WTI ~ I T1'
8 CJ1t8Ah R.AGGIDA GOLDEN fANUr 9' EA EMEN
109 PANIGh1 VIRGAIUM 9MYTGHtiRA88 9
N 1 N I ~ raP aF woo ~ ii ~ ~ ~ ~ ~ 30' rsl HYM~IOGALLS GAROLIHUWA 5PIDER LILY IS' J ( T I I P) - 451A0 196 IR15 V~6MGA BLUE fLAb IRIS i I6' I
101 JINGUS B~LORU5 SHORE RUSH y ~ ~ ( `
I I ~r _ L J I - 4jppp b NYNPHAEA ODORATA FRAbRANT WATER LILY 3~ I 1 , I
f' 3 8 . ~ ~r ~ j^~, - - 3 W6 PELTANDRA vIRSIMCA I ! I ~ ~ I ARROW ARUM I6' N
r, ~ ,f 117 Pa7NTEDETtIA GORDATA PK.KCita WEED N!'
~ 0 r. - RIP-R RIP-RAP 116 SAC~ITTARIA LATIFOI.IA BROADLEAF ARROWFEAD 18' IIb SAUW1~15 GERHAS LIZARD5 TAIL 1'
r 139 SGIRPU9 PUNSEtS TNREE-54i4RE BIA.RISN 18'
I E22 zIZANIA AQUAM.A NULD RIDE ID'
OVERFL OW SPILLWAY DETAI ~ 4. ~ X 2 7 INLET NOT TO SCALE ,.;;d~~ ~ - - DET,~ I L NOTE. -THE CONTRACTOR SHALL SEED AND MULCH ALL BARE AREAS NOT COVERED BT PLANT
MATERIAL AFTER CONSTRUCTION IS COMPLETE SILT FENCE SHOULD REMAIN IN PLACE
--STS-N9:-~ - T - ABSTRACT UNTIL GRASS HAS BECOME ESTABLISHED PRIEST CRAVEN E ASSOCIAT ABSTRACT -SOIL DEPTH MINIMUM SHALL 8E 4". ES, INC.
~ rv OUTLET DEVICE INFORMATION LAND USE CONSULTANTS
~ N 8 460 h i s an a 460 2' X 2' riser w i th a 12" RCP Barre I re u i rem This analysis was conducted in order to comply with the City of Raleigh Stormwater management 3808-8 COMPUTER DRIVE, SUITE 104 requirement of limiting the post development runoff to that which would hove occurred under RALEIGH, N. C. 27609
q 8 ~ 30 foot rip rap lined secondary Spillway pre-deve pre-development conditions during the two year design storm. HYDRCLOGIC DATA
~ A ~ ~ • • - Norma I Poo I EI evat i on 447,00 SEAGROVES FARM
u t'~ ~ Top of Water Quality Paol Elevation 448,50 HYDROLC6 HYDROLOGIC ANALYSIS LENTER STRUT. APEX FILE NAME : SEAGROVESFARMD4.123
- Principal Spillua Elevation 448.50 - - - - - ~ Y 2 Tear Water Surface Elevation 448.82 The rani DRAINAGE POINT 4 - POST DEVELOPMENT DATE : NOV 21, 2005 The rational formula was used to determine the expected peak discharges for each set of conditions. The WATERSHED LAND USE DATA
` ` 10 Year Water Surface Elevation 449.61 time of i time of concentration was determined usinq the Kirpich Equation. The storm hydrograph and the time to
Secondary Spillway Elevation 450.00 peak of 100 year Water Surface Elevation 450,35 Method of peak of the hydrograph were determined in accordance with the Small Wattrshed Flydrograph Formulation TRACT DESCRIPTION SOIL Method outlined in H. Rooney Malcom's 'Elements of Urban Stormwater DeSign'. NO C. AREA
x s = - Top of Berm Elevation 451.00 GROUP AC.
~ ~ - - - _ _ _ Run o f f vi _ ~ ~ Farebay Elevation 444,00 uno volumes were determined usinq the Soil Conservation Service methodology as outlined in NEH-4, I BUILDINGS AND STREETS B 98 0.95 1.86
p C,~ ~ ~ \ TOP BERM EL,=451 00 High Marsh Elevation 446.50 Runoff u Runoff coefficients and curve numbers were taken from standard values based on land use in accordance 2 LANDSCAPE AREAS B 61 0.35 2,72
9~ ~ ` ~ ~ - ( WA ~ 8. ,4 Law Marsh E I evot i on 445.50 with Choi 6 3 450 3 UNDISTURBED WOODED AREAS with Chow, Malcom, and NEH-4. B 60 0.20 0.00
~'S0 Micro Poal Elevation 444,00 I LLWAY EL. =450 00 Hydroloq Hydrologic soil groups were determined based on the Wake County Soil Survey and the soils information TOTALS AND COMPOSITE NUMBERS 76.0 0.59 4.58
- - - Water quality pool drawdown orifice dlam I.O in container n contained in NEH-4.
~ Drawdawn time from fallin head orifice 3.8 da s _ _ - - 9 Y - Ra i n f a l l lays TIME OF CONCENTRATION Rainfall intensities were taken from National Weather Service data complied by Malc©m in Exhibit 2 of
GLASS B POOL EL.=441 OO -RTP=RAP----- - - ` E I emen t~ `Elements of Urban Stormwater Design'.
---P T a13TL-~T-------- - _ REVIEW CERTIFICATI0~1 BY THE TOWN OF APEX Ta o r I By TR-55 methodology, printout attached 0,21 HR Topographic information used in determining drainage areas and hydraulic lengths was taken from the 12.6 MIN
~ P 9 a P City of City of Raleigh 615 data. RUNOFF AMOUNTS
_ D ~=b' -i- -
- IfPTH=22 _ ~ This draw' has been reviewed b the Town of Apex, and to the best of m knowled a and - - - - - - ~ Y Y g PR I EsT, PRIEST, GRAVEN £ ASSOCIATES, INC. Determine runoff volume from S. C, S. procedures
belief, conforms to the requirements established in the Standard Specifications of the Town of LAND USE LAND USE CONSULTANTS linch storm
- - - _ - - - A ex. However, this si tore does not constitute a variance from an re ents contained 3808-B c _ WATfR ALI TY _ - - - . p ~ Y BALE 16H 3808-B COMPUTER DRIVE, SUITE 104 Rainfall RALEIGH, N. C. 27609 1.00 inches
- - ORI f I 440 many federal, state, or local code, law, specification, rule or ordnance. The developerJengmeer/ ' 440 CN 76.0
o ~ contractor is solely responsible for meeting all applicable requirements. HYDROLOc - ~ - (2) 24' HYDROLOGIC DATA From Buildin s and Str t SEAGROVES FARM q ee s 5340 cf
fV ~ ANTI- A V CENTER S ~ - --SEEP-- - - - _ _ By: Date: DRAINAGE CENTER STREET, APEX FILE NAME : SEAGROVESFARMD4,123 From Landscape Area 125 cf
~ _ COLLAR DRAINAGE POINT 4 - PRE DEVELOPMENT DATE : NOV. 21, 2005 From Undisturbed Wooded Are 0 cf
WATERSHE ---Z Z - - - WATERSHED LAND USE DATA Average Runaft = 0,329 inches
12'RLP Total Runoff Volume = 5465 cf TRACT DESCRIPTION SOIL G. AREA 2 ear storm
3 ~5t SOIL EROSION AND SEDIMENTATION CONTROL TRACT CERTIFICATION BY THE TOWN OF APEX No' N0. GROUP AC y
24 hour, 2 year rainfall 3.60 inches - I BUILDINGS P,ND STREETS B 98 0.95 0.00 CN 76.0
- - ~ I v Q 2 _ ~ r . This drawing has been reviewed by the Town of Apex, and to the best of my knowledge and 3 2 CLEARED FIELDS, PASTURE 8 69 0.35 0.00
3 ROW CROPS B 75 0.45 4.85 Runoff = 1 440 inches
z ----"-z - belief, conforms to the re uirements established in the Soil Erosion and Sedimentation Control 4 430 q 430 - 4 UNDISTURBED WOODED AREAS B 60 0.20 0.70 Runoff Volume = 23941 cf
Ordinance of the Town of Apex. However, this signature does not constitute a variance from TOTALS A TOTALS AND COMPOSITE NUMBERS 73.1 0.42 5.55 10 year storm 24 hour, 10 year rainfall 5.38 inches
- - - any requirements contained in any federal, state, or local code, law, specification, rule or CN 76.0
- ordinance. The developer/engineer/contractor is solely responsible for meeting all applicable T I NE OF TINE OF CONCENTRATION Runoff = 2.85 inche
- - requirements. 5 By TR-55 methodology, printout attached 0.29 HR Runoff Volume = 47453 cf
- - THIS SIGNATURE DOES NOT CONSTITUTE PLAN APPROVAL, ONLY PLAN REQUIREMENTS. A SEPARATE LETTER OF PLAN APPROVAL WILL BE MAILED 17.4 MIN
_ _ TO THE FINANCIALLY RESPONSIBLE PERSON AT A LATER DATE ACCORDING RUNOFF A RUNOFF AMOUNTS
_ _ . TO THE CONSTRUCTION SEQUENCE. DETERMINE THE ANTICIPATED STORAGE VOLUMES `~p1UU~~Nbq~
- - - - - , De t e rm i m Determine runoff volume from S.C.S. rocedures ~a ~ C A RO p 5•••, y~ Water (La I i ty requirements mandate contra I of the ~ 0,~`~p, C ''~,!y ti
- - - _ By: Date: runoff from the I Inch storm. 5465 cf .Z~ ,~0 '9
- - 2 year s 420 420 2 year storm ; 24 hour, 2 year rainfall 3.60 inches Town of Apex Ordinances
CN 73.1 mandate control of the 2 and 10 year sto -4760 cf Zr7=
_ REVIEW CERTIFICATION BY THE TOWN OF APEX
- - - _ - PUBLIC WORKS AND UTILITIES Runoff = 1,254 inches EXTENDED DETENTION WETLANDS SIZING CALCULATIONS S ~ ' V ~ 0'~ Runoff Volume = 25263 cf
10 year Size an extended detention wetlands to tr y~~ R ~P~~ eat the runoff from the site. Y M ~
This drawing has been reviewed by the Town of Apex Public Works and Utilities Department 10 year storm ~~~n 24 hour, 10 year rainfall 5.38 inches Normal pool depth 3 feet
and to the best of my knowledge and belief, conforms to the requirements established in the GN 73, I Impervious cover percentage of the tract 0.41 qo ~1~Upppl~~
- Standard Specifications and Constniction Details and the Unified Development Ordinance of the Surface Area to Drainage Area Ratio 1.77 ,~d Cq ~4~~ Runoff = 2.59 inches 4
- - Town of A ex. However this si tore does not constitute a variance from an re uirements p ~ Y q Runoff Volume = 52213 cf Required Surface Area 0,08 ac Q ~ y
- - - - contained in any federal, state, or local code, law, specification, rule or ordinance. The ~ OFD 3591 sf ~ ~ r
- developerlengineer/contractor is solely responsible for meeting all applicable requirements, L
410 410 Surface Area Provided 3550 sf ; 10 56
+ 2+00 3+00 B: 00 ate: 0+00 D 60 30 15 0 30 60 100 50 25 0 50 100 , I!'. ~ I I I I I I ~i_'Yn. N
Y
1/4
F. Q
GRAPHIC SCALE GRAPHIC SCALE
REVISED 54
SEAGROVE'S FARM S`"`E: AS 5Ha-N PLAN E PROF ILE PRIEST,CRAvEN ~ AsSOCIATESINC. 4D P014D - LAND USE CONSULTANTS PLANNERS/LANDSCAPE DESIGNERS/SURVEYORS/ENGINEERS
51 NGLE FN71 LY e rowNHousE suW i vi si ON DATE: DECEMBER I , 200 EXTENDED DETENTION WETLAND P LELIA 5. WOMBLE GHRITABLE TRUST APEX, NORTH CAROLINA PROJECT: 2002-024.001
3803 - B Computer Drive, Suite 104 Raleigh, N,C. 27609. Phone 919 / 781-0300. Fax [phone]. Email PriestCravenonc.rr.com 421
PRELIMINARY NOT-RELEASED FOR CONSTRUCTION