HomeMy WebLinkAbout20070617 Ver 2_401 Application_20070707MACTEC
engineering and constructing a better tomorrow
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July 16, 2007 ~'~~°'
Ms. Lia Myott ,-,,r
NCDENR, Division of Water Quality ,~I,~;,, l '~ ;~Ga%
2321 Crabtree Boulevard, Suite 250
Raleigh, North Carolina 27604 ~~'~~~ vv°7~i- - v~~uTY
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Hand-Delivered
Subject: Isolated Wetland Permit Application Package
Crossroads Apartments/Legacy Crossroads Site
Cary, North Carolina
MACTEC Project No. 6470-07-1652
Dear Ms. Myott:
Please find enclosed the Isolated Wetland Permit Application Package for the Proposed Legacy
Crossroads site in Cary, North Carolina.
If you have any questions, please do not hesitate to contact us at (919) 876-0416.
Sincerely,
MACTEC Engineering and Consulting, Inc.
~~ ! ~G~`~
vLG~~/~J
Lauren B. Saal
Staff Scientist
Richard G. Harmon
Principal Scientist
Attachment: Permit Application
cc: Kelly Dunbar, Laurel Partners
MACTEC Engineering and Consulting, Inc.
3301 Atlantic Avenue Raleigh, NC 27604 Phone: 919.876.0416 Fax: 919.831.8136
www mactec.com
Office Use Only: Form Version March 05
USACE Action ID No. 200620568 DWQ No. ~.XQ O 1 ' O Co 1 `~ 1r' 2.
(If any particular item is not applicable to this project, please enter "Not Applicable" or "N/A".)
I. Processing
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: Not requested
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), chec ,~? ~~ ^~'
II. Applicant Information JUL 1 ~ 2007
Owner/Applicant Information pENR - WATER QUi+LITY
Name: Laurel Partners, LLC ~ w~Tl.A~agANa sroR!~vAT€R ewwc}+
Mailing Address: Attn: Kelly Dunbar, Director
801 East Trade Street, Suite 200
Charlotte NC 28202
Telephone Number: 704-517-7966 Fax Number: 704-377-4510
E-mail Address: kwd(a~woodpartners.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: Richard Harmon
Company Affiliation: MACTEC En ineering and Consulting, Inc.
Mailing Address: 3301 Atlantic Avenue
Raleigh, NC 27604
Telephone Number: 919-876-0416 Fax Number: 919-831-8136
E-mail Address: rgharmon ,mactec.com
Page 5 of 13
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: Legacy Crossroads Apartments
2. T.I.P. Project Number or State Project Number (NCDOT Only): Not a DOT Project
3. Property Identification Number (Tax PIN): 0773907598
4. Location
County: Wake Nearest Town: Cary
Subdivision name (include phase/lot number): Cary Crossroads /Lots E, F, and G
Directions to site (include road numbers/names, landmarks, etc.):
From the I-440 Outer beltline, take exit 1 C (Jones Franklin Road). Turn left onto Jones
Franklin Road. Continue on Jones Franklin Road for 1.3 miles. Turn right onto Crossroads
Boulevard. The site is on the right at the intersection of Jones Franklin Road and Crossroads
Boulevard.
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): 35.7568 °N -78.7323 °W
6. Property size (acres): 18.1
7. Name of nearest receiving body of water: 1) Ut to Swift Creek (From source to dam at
Silver Lake) -Index Number: 27-43-5-(1), Classification: WS-III & B NSW
2) Walnut Creek (Lake Johnson~(Backwaters of Lake Johnson to dam to Lake Johnson) -
Index Number: 27-34-(1.5), Classification: BNSW
8. River Basin: Neuse River - Subbasin: 03-04-02
(Note -this must be one of North Carolina's seventeen designated major river basins. The
River Basin map is available at httpa/h2o.enr.state.nc.us/admin/maps/.)
Page 6 of 13
9. Describe the existing conditions on the site and general land use in the vicinity of the project
at the time of this application: Wooded, undeveloped land surrounded by commercial and
residential properties. Please see the "Existing Condidtions" figure.
10. Describe the overall project in detail, including the type of equipment to be used:
The project will involve excavating and filling the current wetland. Heavy construction
equipment including track excavators, bulldozers, pans, rubber tired tractors, paving
machines and dump trucks are anticipated for the proposed construction activities.
Coordination with the prime contractor re arding implementation of construction
methodologies that further minimize permitted impacts to wetlands will be evaluated where
feasible.
11. Explain the purpose of the proposed work: Construction of an apartment complex.
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. A USACE jurisdictional determination was obtained on April 13, 2006
under Action ID Number 200620568. It was determined that the on-site wetland is considered
isolated.
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
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.
Page7of13
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.
1. Provide a written description of the proposed impacts: The wetland will be excavated and
filled prior to the construction of an apartment building.
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
Site Number
(indicate on map)
Type of Impact Type of Wetland
(e.g., forested, marsh,
herbaceous, bog, etc.) Located within
100-year
Floodplain
( es/no) Distance to
Nearest
Stream
(linear feet) Area of
Impact
(acres)
1 Fill Forested No 6500 0.28
Total Wetland Impact (acres) 0.28
3. List the total acreage (estimated) of all existing wetlands on the property: 0.312
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
Number
(indicate on ma)
Stream Name
Type of Impact
Perennial or
Intermittent? Average
Stream Width
Before Im act Impact
Length
(linear feet) Area of
Impact
(acres)
No stream
impacts
Total Stream Impact (by length and acreage)
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.
Page 8 of 13
Open Water Impact
Site Number
(indicate on ma)
Name of Waterbody
(if applicable)
Type of Impact Type of Waterbody
(lake, pond, estuary, sound, bay,
ocean, etc.) Area of
Impact
(acres)
No open water
impacts
Total Open Water Impact (acres)
6. List the cumulative impact to all Waters of the U.S. resulting from the protect:
Stream Impact (acres): 0.0
Wetland Impact (acres): 0.28
Open Water Impact (acres): 0.0
Total Impact to Waters of the U.S. (acres) 0.28
Total Stream Impact (linear feet): 0.0
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.
A 0.312-acre isolated wetland. verified by the USACE. is located on the site. Impacts to the
wetland may include: excavation and fill.
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
Describe the method of construction (e.g., dam/embankment, excavation,
draw-down valve or spillway, etc.):
Proposed use or purpose of pond (e.g., livestock watering, irrigation, aesthetic, trout pond,
local stormwater requirement, etc.):
Current land use in the vicinity of the pond:
Size of watershed draining to pond: Expected pond surface area:
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.
A retaining wall will be constructed in the wetland within the southern portion of the site.
Construction of the retaining wall will minimize impacts to the wetland by 0.032 acres.
^ wetlands
installation of
Page 9 of 13
No streams are present on site, therefore no stream crossings or relocations will be necessary.
Movin property access routes or realigning and reconfiguring the site layout would not reduce
the wetland impacts.
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
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/ncwetlands/stnngide.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.
No mitigation is required because impacts to the on-site wetland are less than one acre.
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
(919) 715-0476 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
Page 10 of 13
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): 0.0
Amount of buffer mitigation requested (square feet): 0.0
Amount of Riparian wetland mitigation requested (acres): 0.0
Amount ofNon-riparian wetland mitigation requested (acres): 0.0
Amount of Coastal wetland mitigation requested (acres): 0.0
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 (919) 733-5083 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
(Meuse), 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 )? 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.
Zone* Impact Multiplier Required
(square feed Mitication
l 3 (2 for Catawba)
2 1.5
Total
Page 11 of 13
* 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. Will not be using buffer mitigation.
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 existing impervious acreage equals 0 acres. The proposed impervious acreage equals 10.82
acres approximately 60% of the 18.1-acre site). Stormwater will be treated by a constructed
wetland and a dry retention pond prior to off-site discharge. Please see the attached Stormwater
Management Calculations document and Stormwater Mana;ement Plan figures for more detailed
information.
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.
Wastewater will be directed to the city sewer system.
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 anafter-the-fact permit application? Yes ^ No
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 ^ 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:
The entire site will be developed and will leave no acreage for additional development. The
majority of the area surrounding the site is already developed for commercial purposes and little
land remains for further development.
Page 12 of 13
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).
Kelly W. Dunbar, ner
Applicant/Agent's Signature ~ Date
(Agent's signature is valid only if an authorization letter from the applicant is provided.)
Paso ? 3 a` i;
Addendum to the Pre-Construction Notification and "Buffer Rules" Application Required for
Projects Submitted Under the
"Express Review Program"
North Carolina Division of Water Quality Version 5.0
October 1, 2006
Email Address: 401express@ncmail.net
Purpose: To provide a detailed explanation of the information required by the Division of Water Quality
in order to expedite the review of applications for 401 General Water Quality Certifications, Isolated
Wetland Permits, Stream and Wetland Mitigation Plans and Riparian Buffer Approvals (Please Note: do
not leave any questions unanswered or use terms such as "N/A" without an explanation).
Fees:
401 Water Quality Certifications
Riparian Buffer Authorization:
Riparian Buffer Minor Variance:
Coastal General "Major Variance":
Isolated Wetland Permit:
Major (>/= 150' stream or >/= 1 acre wetlands) $2,000.00
Minor (< 150' stream or < 1 acre wetlands) $1,000.00
(exclusively or "in addition" to) $2,000.00
$1,000.00
$1,500.00
General $1,000.00
Please read the entire document before attempting to determine the proper fee. Fees are additive for
particular projects.
Things to keep in mind when filling out the application:
A specific answer must be provided for each question. For instance, if a numerical answer is requested
then a numerical answer must be provided along with the supporting information necessary for DWQ staff
to verify that the number is accurate. Likewise, if explanations are presented to justify certain responses,
the explanations must be completely supported by documentation. DWQ staff cannot assume that
unsupported or undocumented information is accurate. "N/A" is not an acceptable answer for any
question since the DWQ Staff reviewing the application must have an opportunity to determine whether or
not any requested information is pertinent.
All forms, guidance, worksheets, applications, etc. used must be the current versions as posted on our
web site at http://h2o.enr.state.nc.us/ncwetlands. The Express Review Program website can be found at
http://h2o.enr.state.nc.us/ncwetlands/express_review.htm. Please note that it will be responsibility of the
applicant or the applicant's consultant to verify that the current versions are used. The versions posted
on our web site will be considered to be the current versions.
You are a very important part of the success of this program, if you have suggestions or clarifications
please send your comments to the Wetlands/401 Unit of the DWQ (via email at
401 express@ncmail.net).
Filling Out the Pre-Construction Notification Application:
The Corps of Engineers (USAGE)/DWQ official, joint Pre-Construction Notification (PCN) Application
must be used as a basis for the expedited review process. The completed application should be
presented first and the supporting information tabbed and collated in the same order. Using a custom
format is not recommended. The open squares (~ are checklist items. The following items correspond to
the numbering system on the Pre-Construction Notification Form (PCN):
IMPORTANT: USE CHECK BOXES TO TRACK PROJECT INFORMATION!!
2
SECTION I. PROCESSING
E~ 1 & 2.The USACE determines which Nationwide, Regional, or General Permit is
required. If you have verified with the USACE which permit they intend to use for
your project or if you already have written approval from the USACE, please
indicate by adding "verified" or "verified, attached", respectively, in the blank next
to the Permit number requested.
^ Attach the USACE Approval if you have it.
~~ 3. It is not anticipated that the expedited process will be requested for this situation
~ 4. If you propose to impact 150 feet or more of perennial stream or 1 acre or more
of wetland and onsite mitigation is not proposed, it is recommended that you
either locate an acceptable private bank with available credits (with
documentation to show that the bank can and shall provide the credits needed)
or obtain approval from the EEP for the entire amount of stream and or wetland
as DWQ will make the final determination as to whether or not mitigation applies.
A complete Express application is not considered received unless an EEP
approval letter is attached if mitigation is requested through EEP. Please note
that the USACE may have different mitigation requirements and thresholds.
~ 5. State whether your project will require a CAMA Minor, Major or General Permit
and give the status of the permit.
SECTION II - APPLICATION INFORMATION
1. 15 NCAC 2H .502(fl reads as follows: "Who Must Sign Applications. The application
shall be considered a "valid application" only if the application bears the signature of a
responsible officer of the company, municipal official, partner or owner. This signature
certifies that the applicant has title to the property, has been authorized by the owner to
apply for certification or is a public entity and has the power of eminent domain. Said
official in signing the application shall also certify that all information contained therein
or in support thereof is true and correct to the best of his/her knowledge."
^ Please indicate how the applicant meets the above definition and provide
supporting documentation.
Please provide all of the requested contact information including a fax
number and email address.
2. ~ If the application is not signed by the applicant, please attach the agent authorization
letter. The applicant must sign the agent authorization letter. The applicant's name
and position must also be spelled out as many signatures are difficult to read.
3. ~ Please provide all of the requested contact information including a fax number and
email address.
SECTION III -PROJECT INFORMATION
The following is the most critical of all the information that you must provide. The quality and detail of the
information will often determine the expeditiousness of the review. The following is a checklist of the
types of pertinent information required at a minimum:
Maps and Plans:
The most recent version of the 1:24,000 USGS Topographic Map- Please cleanly
delineate the site boundaries, etc. on the map. If the delineation obscures any of the
features, it is recommended that a clean copy be provided. Please indicate the
quadrangle name. You can go to the USGS web site (http://mac.usgs.gov/maplists/) to
verify the most recent version.
5~ The most recent version of the NRCS Soil Survey Map - (required for projects within
the Neuse River Basin, Tar-Pamlico River Basin, Randleman Lake Watershed and the
Catawba River Basin, also recommended for all projects) -Please cleanly delineate the
site boundaries, etc. on the map. If the delineation obscures any of the features, it is
recommended that a clean copy be provided. Please indicate the page or map number
from which the copy of the map was made. Copies of the current soil survey and/or soil
survey map sheets can be obtained from the local NRCS County Office
(http://www.nc.nres.usda.gov/). GIS soil layers are not acceptable.
C~ Vicinity map -Please clearly mark the location and approximate boundaries of the
property and project on the map. Please indicate north and scale. Please include
applicable road names or State Road numbers.
^ The Site Plan -The most critical map to be provided is the site plan. You must provide
full sized plans. The following is the minimum list of plans that are typically needed.
f~ Pre-construction/Pre-existing conditions -This sheet must be scaled and
include all jurisdictional and non-jurisdictional wetland, stream, water features,
State regulated buffers, topographic contours with elevations, approximate extent
and nature of forest, field, landscaping, or other cover. Any existing structures and
impervious area must be shown. Existing utility lines and easements must be
shown. Existing roads, culverts, and other pertinent features must be shown. North
arrow and the scale must be shown. Please note that the impact boundaries on the
maps should correspond to the flagged impact boundaries in the field.
~ Proposed conditions -These sheets must be scaled and show all existing
jurisdictional and non jurisdictional wetland, stream, water features, and State
regulated buffers (delineated into Zone 1 and Zone 2) must be underlain on the site
plan(s). The plans must show all built-out structures and impervious cover. The
plans must include the final grading contours with elevations. The plans must
indicate all utilities and easements. It is likely that several versions of the final built-
out site plans will be necessary.
d Drainage Plans -Final drainage plans must be included. The plans should include
the locations and pertinent elevations and sizes of the collection system and
drainage ways. All inlets and outlets must also be shown with pertinent elevations.
Scaled stormwater BMPs must also be indicated as required by DWQ rules and
policies. In certain cases, final stormwater management plans must also be
provided, but that will be addressed later in this document.
^ Plats -The plans must show the location and layout of all sub-divided parcels with
lot identifications. Platted parcels must be developable without further impacts to
jurisdictional and non-jurisdictional wetlands, streams, water features, and State
regulated buffers.
Proposed Impacts -All impacts to jurisdictional and non-jurisdictional wetland,
stream, water features, and State regulated buffers must be shown and labeled on
the site plans. All excavation, fill, flooding, stabilization, and other impacts that will
be conducted in or near jurisdictional and non jurisdictional wetland, stream, water
features, and State regulated buffers must be indicated.
4
Wetland Impacts (on the site plan):
~ Precise grading and final elevation contours must be provided. Existing vegetation and
any clearing must be specified.
~/ All subsurface utility lines must indicate the location of anti-seep collars. Construction
detail for anti-seep collars must be provided.
d Roadway or other crossings of riparian wetlands may require floodway culverts to
maintain existing hydrological conditions.
C~ When surface drainage features or groundwater recharge areas that feed or would
reasonably feed wetlands that are not to be filled are made impervious, it may be
necessary to direct some stormwater runoff to those areas in order to maintain hydrology.
You must identify these areas and address them. Supporting explanations and discharge
information must be provided to show that the wetland would not be eroded or receive
too much or too little hydrology. In many cases this could help satisfy part of a
stormwater management plan.
^ Flooding
^ Draining
Stream Impacts:
^ Stream impacts must be clearly shown on the plans. The centerline as well as the banks
of the stream must be surveyed or located by GPS for the portion of the stream to be
impacted.
Culverting:
^ The inlet and the outlet of the culvert should be aligned with the stream as much as
possible. Inlet and outlet elevations and streambed elevations should be indicated.
u Any widening of the stream must be shown with elevations.
^ The extent of and plan details for all dissipation or grade control devices should be shown
with pertinent elevations.
^ For shorter culvert sections, such as for road crossings, a longitudinal cross section that
shows the stream bed invert at the inlet and outlet, the existing stream bank elevations
and the invert of the inlet and outlet of the pipe(s) must be provided.
For shorter culvert sections, such as for road crossings, a vertical cross section must be
provided that shows the stream cross section at the inlet and outlet overlain with the
culvert and fill cross section.
For bottomless culverts or other spans, a vertical cross section should be provided that
shows the minimum distance from each span to each stream bank, the stream cross
section, the height of the span above the stream and the minimum distance from the
edge of each footer to each stream bank.
^ For bottomless culverts or other spans, a plan view must be provided that shows the
location of the spans and the stream banks.
For longer culverts or culverts that will pass beneath substantial impervious cover, it will
be necessary to provide adequate plan detail to show that discharge velocity/energy will
be adequately dissipated.
5
^ Cross section details must be provided showing the provisions for aquatic life passage.
Aquatic life passage through culverts is typically achieved by placing the invert of the
culvert below the existing bed of the stream per the USACE or North Carolina Wildlife
Resource Commission guidelines. Other methods such as baffles may also be used.
Please be aware that such placement may require the use of grade/velocity control
measures up or down stream of culverts on steeper streams to prevent head-cuts or
streambed erosion. The culvert placement relative to the streambed can be indicated on
the longitudinal profile. Grade and velocity control measures must be indicated on the
plan view and typical designs should be provided.
^ Multiple culverts, wide culverts or sectioned box culverts typically require the use of sills,
off-setting or other means to match the cross section of the existing stream (in order to
maintain stream stability and provide aquatic life passage). A vertical cross section of the
culverts should be shown overlain with the up and downstream stream cross section
including the stream flood-prone area.
^ Impacts associated with dam construction must indicate and enumerate all fill associated
with the dam footprint, spillway and any bank stream bank stabilization. The length of
stream impounded must also be indicated and enumerated.
Stream Relocations:
^ Stream relocations must be conducted as specified in General Certification numbers
3402 and 3404 (available on the Wetlands Unit web site). Stream relocation plans must
include:
^ Morphological measurements (see Appendix B of the Internal Technical Guide for Stream
Work in North Carolina available on the Wetlands Unit web site) -not all of the
measurements are applicable in every instance.
^ Typical stream cross sections - Typically, a riffle cross section and a pool cross section
that includes the entire flood prone area. The bankfull and flood prone area elevations
should be indicated. Similarly, a riffle cross section of the reference stream(s) should be
provided.
Plan view -Provide scaled plans that show the location of the proposed (preferably with
stationing) and the existing stream. In most instances, the bankfull contours and flood
prone area contours, in stream structures, bank revetments/stabilization, channel plugs,
planting plan, vegetation conditions, stormwater outlets, grade controls, bridges, culverts,
sewer lines, roads, fencing, and easement lines should also be provided.
^ Longitudinal Stream Profile - A scaled profile that indicates the thalweg, bankfull, and top
of bank elevations should be provided for the design and reference streams. In many
cases, it will also be necessary to show the existing land elevations for the design
stream.
^ Planting Plan - A planting and/or vegetation management plan should also be provided
that makes use of appropriate native vegetation. The plan should indicate the extent,
density, and species of plants to be provided.
^ In-stream structure, bank revetment/stabilization, and stormwater outlet typicals -
Detailed, typical plans should be provided for all in stream structures, bank revetments or
stabilization, and stormwater outlets. The typicals should include materials and
specifications as well as relative lengths, positions, and angles.
Sediment transport analysis - A sediment transport analysis should be provided based
on the current, relevant, accepted practices. The sediment transport analysis should be
relevant to the streambed load type and should predict bed load transport equilibrium.
6
^ Permanent conservation easement or similar means of protection must also be provided.
Other Information:
!~ 1. The project should always be referred to by this name in all correspondence as well
as the DWQ # once it is provided.
^ 2. This only applies to DOT projects, which are not expected to utilize the Express
Review Program.
3. This should be the size of the project as identified by the USACE for 404 Permits or
by the Division of Water Quality for Buffer Approvals and Isolated Wetland Permits.
w/ 4. Please provide the name (as depicted on the USGS topographic map and DWQ
Stream Classification Lists) of the nearest water body(ies) to which your project is a
tributary to (e.g. "Neuse River (Falls Lake below normal pool elevation)"). (Do not
simple state "stream", "river", "ocean", "sound" or "lake".) Please provide the "stream
index number" of the named water body or water body section (e.g. "27-(1)"). Also,
please provide the full water quality classification (e.g. "WS-IV NSW CA") of the water
body. This information can be obtained from the DWQ web site
http://h2o.enr.state. nc. us/bims/Reports/reportsW B. html.
5. Please state which river basin and sub-basin that your project is in (e.g. "Neuse River
Basin, NEU01"). This information can be obtained from the DWQ web site
http://h2o.enr. state. nc. us/bims/Reports/reportsWB. html.
C~' 6. Conditions should also be indicated on the existing site plan where applicable.
Photos (including aerial photos) can be helpful in describing the existing conditions.
~' 7. You must provide an attachment that explicitly describes what the proposed project
will entail from the planning stage to final construction.
C~ 8. This can be a simple explanation, but it is critically important because the purpose
dictates how the no practical alternatives are reviewed.
SECTION IV -PRIOR PROJECT HISTORY
^ Please include copies of all 401 Water Quality Certifications, Isolated Wetland
Permits, Buffer Approvals, USACE Permits, CAMA Permits for the site as well as a
copy of the final approved, site plan.
SECTION V -FUTURE PROJECT PLANS
C~ For projects utilizing the express review process, all impacts both present and
potential future must be indicated. For instance, the location or configuration of
platted lots sometimes suggests that future impacts will be necessary to build,
access, or otherwise develop such lots. Failure to account for such potential impacts
could delay or disqualify a project from the rapid review process. If you believe that
the lot can be developed without impacts, but you anticipate that your assertion may
be questioned, it is recommended that you provide a potential building foot print
and/or grading plan to show that future impacts could be avoided.
SECTION VI -PROPOSED IMPACTS TO WATER OF THE US
~ 1. It is recommended that the individual impacts be described if there are special things
to note about the impacts. Typically the most important thing is to have detailed
accurate site plans as described above. Please make sure they are clearly labeled.
G Please include all proposed temporary impacts.
7
Also, a current, signed delineation map from the USACE should be provided (if
available) and a map locating the stream origins signed by the appropriate DWQ
Staff must be provided if applicable.
~ 2. Each impact to a wetland must be clearly labeled and identified on the site plan. The
type of impact must be clearly stated. If the impact is temporary, a specific plan must
be described or shown as to how the wetland will be restored. Keep in mind that the
USACE delineates some features as wetlands that DWQ calls streams. Please list
any impacts in this table that DWQ would identify as a stream. If there is any doubt,
it is recommended that the impacts be listed as streams. Please follow current DWQ
policy with respect to whether a stream is perennial or not. It is recommended that
you assume that a stream is perennial (unless you are positive that it is not) so if
mitigation is required then the appropriate amount of mitigation would be anticipated
or requested from the EEP or private bank. If the EEP or private bank has pre-
approved too short of an amount of stream or if inadequate mitigation is proposed,
then that situation will result in delays.
^ 3. Sometimes it is difficult to determine whether a feature is a modified natural channel
or a ditch, especially in the eastern part of the State. Soils, drainage features,
topography, macroinvertebrates, and similar factors, all are important for making that
determination.
~ 4. Other items to address not specifically requested in the application include
downstream sediment starvation, thermal pollution, low flow releases from dams, and
aquatic life passage. Other important considerations are buffer reestablishment or
mitigation around ponds on buffered streams. The site plan should include the
precise elevation contour of the normal pool as well as the dam footprint. Mitigation
is required for wetland flooding of an acre or greater and for stream fill (if over the
150 foot threshold) under the dam footprint and any outlet stabilization.
SECTION VII -AVOIDANCE AND MINIMIZATION
Avoidance and minimization are critical aspects of an application particularly if you desire the application
to be processed expeditiously. The following is a checklist of avoidance and minimization questions that
DWQ Staff often look for in applications.
^ Are there any stream crossings at angles less than 75° or greater than 105°?
^ Are there any stream crossings that cross two streams above or at the confluence of those
streams?
^ Are there any stream, wetland, water, and/or buffer impacts other than perpendicular road
crossing near the edges of the property?
^ Can the stream be relocated as a natural channel design as opposed to culverted or
otherwise filled?
Is any single stream crossed more than once?
Can property access routes be moved or reduced to avoid stream, wetland, water, and
buffer impacts?
^ Can a building, parking lot, etc. be realigned to avoid impacts?
^ Can the site layout be reconfigured to avoid impacts?
^ Can headwalls or steeper side slopes be used to avoid/minimize impacts?
8
~ Can a retaining wall be used to avoid/minimize impacts?
^ Can cul de sacs be used in place of a crossing?
Can lots be reshaped or have shared driveways to avoid impacts?
If based solely on the practicable physical possibility, the answer is "yes" to any of the above questions
then you must have to provide substantial and convincing justification as to why the impacts are
necessary. If the impacts are required by a local government or other agency, the claim must be
supported with appropriate written documentation from the local government or other agency. Most
projects typically involve the need to justify avoidance and minimization. If this information is not readily
available, then the express review process may not be the appropriate venue to use. Providing
alternative plans (such as plans that avoid the impact, minimize the impact and the preferred plan, similar
to those used in environmental assessments) and explanations as to why the preferred plan is needed
and why the alternative plans won't work are many times helpful in the no practical alternatives review.
SECTION VIII -MITIGATION
Mitigation for the Express Review Program, final mitigation plans must be presented up front. The final
plans (except for plans that propose payment into the Ecosystem Enhancement Program (EEP), Riparian
Buffer Restoration Fund, private mitigation banks, or similar banking instruments) must contain detailed
plans, specifications, calculations and other supporting data that show that the appropriate mitigation will
be achieved at the ratios required. The design plans must be developed to at least the "90%" level.
Monitoring plans must be final and specific. Any means of permanent protection, such as a permanent
conservation easement must be provided. If you elect to use the EEP or a private mitigation bank, it is
recommended that you request the maximum possible mitigation amount that DWQ may require so that
you will not have to get further approval from them on short notice. The EEP and private banks are not
part of the expedited review process and cannot be expected to meet any such deadlines. There will be
no conditional expedited approvals that require final plans at a later date. It is not recommended that
innovative mitigation techniques or greater than 10% preservation be requested as part of an expedited
process.
SECTION IX
If your project requires the preparation of an environmental document under NEPA or SEPA and an
approval letter has not been issued by the State Clearinghouse, then you cannot apply under the
expedited review process. It is your responsibility to find out if such documentation is required.
SECTION X
There are many aspects of the Buffer Rules that must be addressed in every application, if applicable.
The first and most important thing to keep in mind is that allowable activities that require written Approval
from DWQ triggers a review of the entire project for compliance with the Buffer Rules.
Diffuse Flow 8~ stormwater Management:
__ The most common issues that arise involve the requirement for diffuse flow of stormwater
through riparian buffers. Basically one of three things must be indicated in regards to all
"new" stormwater that is collected and subsequently discharged. First, provisions for
diffuse flow through the protected buffer must be made. This usually involves the use of
level spreading devices designed to the latest DWQ guidance on level spreader design,
which is available on our web site. Please keep in mind that it does not matter how far a
discharge point is from a buffer. The stormwater must be flowing in a diffuse manner at
whatever point it eventually reaches the buffer. If the stormwater will not be flowing in a
diffuse manner through the protected buffer at the point it reaches the buffer, then one of
the following options may be allowed:
~ You may provide a nitrogen removing measure such as a forested filter strip,
grassed swale, stormwater wetland, etc. The measure employed should be
9
designed according to the NC DENR Stormwater Best Management Practices
Manual or other DWQ Guidance available at
http://h2o.enr.state.nc.us/ncwetlands/regcert.html. After the nitrogen is treated, the
stormwater can be directly conveyed through the buffer with written DWQ approval.
^ You may discharge the stormwater to an existing man-made conveyance that
currently conveys stormwater through the protected buffer (assuming the
conveyance was not constructed in violation of the Rules) as long as that
conveyance does not need to be altered to convey the flow. Please remember that
there are no other choices. The following checklist is intended to help insure that
your application will not be deemed incomplete as a result of improper stormwater
design.
Stormwater Management (for Buffer Rules compliance only -Also, see Section XI):
All stormwater out-falls must be clearly shown and labeled on the site plan for projects in
Buffered watersheds. List each out-fall as labeled:
^ Option 1: Level spreading devices designed to the latest DWQ Guidance, and
devices that merely control velocity but do not provide diffuse flow such as rip rap
dissipators are not proposed. List each of these out-falls as labeled on the site
plan and provide a DWQ worksheet available at
http://h2o.enr. state. nc. us/ncwetlands/regcert. html:
Option 2: Nitrogen removing measures designed to DWQ Standards are
proposed for discharges for which diffuse flow through a protected Buffer cannot be
met. List each of these out-falls as labeled on the site plan and provide a DWQ
worksheet available at http://h2o.enr.state.nc.us/ncwetlands/regcert.html
^ Option 3: The stormwater will be discharged to an existing man-made (not
including modified natural channels) conveyance that carries the stormwater
through the Buffer. The conveyance was not constructed in violation of the Buffer
Rules. List each out-fall as labeled:
~ All stormwater out-fall must meet one of the options above. (Note: if you cannot check this
box your application will likely not be accepted into the express review process.)
Site Plans:
^ All applications on properties with DWQ protected buffers must clearly depict the buffers
and any impacts to the buffers on the site plans. The impact maps should clearly depict
both zones of the protected buffers and the proposed impact areas (provided in square
feet).
Surface Water 8~ Buffer Delineations:
Any surface waters subject to DWQ protected buffers must be field located and accurately
depicted on the site plans and impact maps. The width, dimensions and pattern of the
surface water must be delineated. The surface water location must not be taken simply
from a USGS map, soil survey or local municipality's map. The buffers must be measured
from the surface water as required within the applicable buffer protection rule (e.g., all
buffers along streams subject to the Neuse and Tar-Pamlico Buffer Rules must be
measured from the "top-of-bank" of the stream and not the centerline of the stream). All
streams must be surveyed or located by GPS and shown precisely on the site plans.
Impact Table:
10
Please provide additional impact tables that clearly state the area of impact for each
corresponding impact site.
Variances:
^ Projects that require a Major and/or "General" Variance will not be eligible for the use of the
Express Review Program (with the exception of the Coastal General "Major' Variance.
Mitigation:
- As opposed to applications that are submitted under our regular process, final mitigation
plans must be presented upfront (see requirements for Section VIII above). The mitigation
plans must comply with the applicable buffer mitigation rule.
SECTION XI - STORMWATER
Please provide the following information in regards to potential stormwater requirements:
E~' The total acreage of the site. l 0 . I (acres)
^~~ The total built-out impervious acreage ~ Q•$oZ. (acres)
^~' The total area that will be disturbed 1~ • ~~ (acres)
t5~ If the total area exceeds 20% imperviousness, the development on the site is uniform in
density, and you claim that the total impervious area is less than 30%, you must provide a
complete, detailed breakdown of the assumed built-out conditions. The breakdown must
be detailed enough to show that all potential impervious areas are accounted for.
^ If there are concentrated areas of development such as multi-family, commercial, cluster,
club houses, etc. that exceed 30% imperviousness and the total imperviousness for the site
does not exceed 30%, a stormwater management plan will likely be required for those
areas that exceed 30% imperviousness.
C3' stormwater management plans must be complete with a final design and an executed
Operation and Maintenance Agreement. There will be no conditional stormwater approvals
for the express review process that allow for approval of the final plans at a later date.
Worksheets must be provided that are available at
http://h2o.ehnr.state. nc. us/ncwetlands/mitresto. html.
SECTION XII -SEWAGE DISPOSAL
'~ Response must be clear and detailed. Any disposal method that suggests further impacts
may be required other than those shown must be clearly addressed on the site plans.
SECTION XIII
Answering yes to either of these responses automatically precludes you from the express
review process.
SECTION XIV -SIGNATURE
^~ The name, position and/or title of the applicant must be in type or long hand script here with
the signature. It should be the same person as described in Part II.
If you have any questions about these requirements, please email the Express Review Program at
401 express@ncmail.net and include your question and phone number and the appropriate staff will
respond as soon as possible.
WITHERS L~~ RAVENEL~
ENGINEERS ! PLANNERS I SURVEYORS
MEMORANDUM ~~ ° ~ ' ° ~° ~ ~ v~
TO: File
FROM: Hunter Freeman
DATE: July 13, 2007
PROJECT: Crossroads Apartments
SUBJECT: Response to DWQ Comments
Stormwater Management Plans
1.a -North BMP
1.a.i The SA/DA ratio was recalculated. Based on 68.5°/° Impervious, a ratio of
2.81 was used.
1.a.ii The revised forebay area is 976 sf, which equals 15.1 % of the normal pool
surface area.
1.a.iii The micropool area was increased to 942 sf, which equals i4.6% of the
normal pool surface area.
1.a.iv One of the inlet locations was removed and relocated per the discussion
during out meeting on July 10, 2007. The length to width ratio requirement
is now met.
1.a.v The drawdown diameter size was revised to 1.5". This results in a
drawdown time of 66 hours.
1.b -South BMP
1.b.i The combined forebay area is 2055 sf, which equals 14.5% of the normal
pool surface area. Per our meeting on July 10, 2007, the 2 forebays have
.been sized according to the respective upstream drainage area.
1.b.ii The micropool area was increased to 2085 sf, which equals 14.7% of the
normal pool surface area.
1.b.iii The routing of the low-flow channel and the network of micropools was
revised as we discussed in the meeting to maximize the flow path and
treatment time.
1.c - A note has been added to the plans stating that no planting shall occur in the deep
.water portion of the ponds.
2 The notes on the plans have been revised to say that prior to the placement of bedding material,
soil samples from the desired source shall be sent to either NCRS or the NC State Ag Extension
for soil analysis. Included on the plans are the soi{ recommendations per the latest BMP
manual.
iii MacKenan Drive I Cary, North Carolina z75ii I te1:919•gb9.334o I fax:9i9.r~b7.boo8 I www.withersravenel.com
70~o Wrightsville Ave I Suite ioi Wilmington, North Carolina z8go3 I tel: 9io.256.9z77 I fax: gio.256.z584
ioz7 Sabbath Home Rd., SW I Supply, NC z846z 1 tel: 91o.8gz.g39z I fax: 9~o.8yz.8oi9
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LEGEND -_
j+ __. J T~~ ~:.
Property Boundary ~~ ~ }~ `
t,` ..r
150 0 150 300 Feet i j
~~
Scale: 1 " = 300' Prepared /Date: Ord ' ~ 2 ~o~
Source: Wake Count GIS• Wake Coun Soil Surve :Sheet 57 ked /Date: 7 -!„~-DJ
Prepared For.' Prepar y: ~ `~` - ~ ?
.<- ~~
Legacy Crossroads ~'MACTEC `~~-~~ ) ~ ~~~ R Soit Surve}~ Map
Wake County, North Carolina MACTEC Engineering & Consulting, Inc.
3301 Atlantic Avenue ~,~^ C~tI _
LAURB4 Raleigh, North Carolina rq ei Y j ~H9 h(
PARTNERS ~~~ ~'j ~ AT~L71 ~Pro~ect: 647®-07- 1 ~52
LEGEND
Property Boundary
® Wetlands
Contours
150 0 150 300 Feet
Scale: 1" =300'
Source: Wake Countv GIS; NCDOT ) t,Checked / Date: : 7—/J-0
Prepared For Prepared B
Legacy Crossroads 'MACTEC ,/j,/ ' ting Conditions
Wake County, North Carolina MACTEC Engineering d Consulting, InL
3301 Atlantic Avenue 0 � 6°
LAUREL Raleigh, North Carolina 27 6-0416 7
PARTNERS y, /
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Project Name: Crossroads Apartments Project #: 2061182
City/State: Cary, NC te: 13-Jul-07
Table 1.1 Surface Area to Drainage Area Ratio for Permanent Pool Sizing for 85% Pollutant
RPmnval FffiriPn~v in fhr PiPdmnnt
Impervious
Cover Permanent Pool Dept
3.0 4.0 5.0 6.0 h (feet}
7.0 8.0 9.0
10 0.59 0.49 0.43 0.35 0.31 0.29 0.26
20 0.97 0.79 0.70 0.59 0.51 0.46 0.44
30 1.34 i .08 0.97 0.83 0.70 0.64 0.62
40 1.73 1.43 1.25 1.05 0.90 0.82 0.77
50 2.06 1.73 1.50 1.30 1.09 1.00 0.92
60 2.40 2.03 1.71 i .51 1.29 1.18 1.10.
70 2.88 2.40 2.07 1.79 i .54 1.35 1.26
80 3.36 2.78 2.38 2.10 1.86 i .60 1.42
90 3.74 3.10 2.66 2.34 2.11 1.83 1.67
Source: NCDENR/DWQ 5tormwater Best Management Practices, pg. 5, April 1999
STORMWATER BMP 1 -NORTH - STORMWATER WETLAND (40% TN Removal)
Land Use Area
(ac) % lA Imp. Area
(ac)
Impervious 3.58 98 3.5
O en S ace 1.54 0 0.0
Totals 5.12 3.5
Total % Impervious Surface Area = 68.5
Surface Area of Permanent Pool:
Assumed depth ~ 3 feet
SA/DA ratio = 2.81 °/° From Table 1.1
Minimum pond surface area (SA) - (DA * SA/DA ratio)/100
SA = 0.744 acres
6265 sq. ft.
Normal pool elevation = 455.5 feet
Surface area provided ~ 0.148 acres
6456 sq. ft.
1-Inch Runoff Volume Calculation
Using the runoff volume calculations in the "Simple Method" as described by Scheeler (7987)
Rv = 0.05 + 0.009(1) where, Rv -Runoff coefficient, in./in.
I =Percent impervious
Rv ~ 0.67 in./in.
Total runoffvolume from 1-inch precipitation:
Runoff volume, 5 = (Design rainfall) (Rv) (Drainage Area)
S = 0.284 acre-ft
12391 cu. ft.
Water quality pool elevation= 457.30 feet
Storage volume provided = 0.291 acre-ft
12680 cu. ft.
Project Name: Crossroads Apartments Project #: 2061182
Ci / ate: Cary, NC Date: 13 Jul-07
STORMWATER BMP - STORMWATER WETLAND (40% TN Removal)
Orifice Calculator
Variables Constants
WQ Volume: .0.2911 Acre-ft 12680.32 cf g = 32.2 ft/s2
Head: 1.80 ft 0.9 ft Cd = 0.6
Draw down time: 66 hrs 237600 s
Orifice Area = 0.011683 sq. ft 1.682406 sq. in
Orifice Diameter= 1.463594 in
USE 1.5 INCH DIAMETER ORIFICE
Project Name: Crossroads Apartments Project #: 2061182
City/State: Cary, NC Date: 13-Jul-07
Table 1.1 Surface Area to Drainage Area Ratio for Permanent Pool Sizing for 85% Pollutant
D.. ~l GFf:.. ..~v :n +Aa P:n~/~nnn+
% Impervious
Cover Permanent Poo! Dept
3.0 4.0 5.0 6.0 h (feet)
7.0 8.0 9.0
10 0.59 0.49 0.43 0.35 0.31 0.29 0.26
20 0.97 0.79 0.70 0.59 0.51 0.46 0.44
30 1.34 1.08 0.97 D.83 0.70 0.64 Q.62
40 1.73 1.43 1.25 1.05 0.90 0.82 0.77
50 2.06 1.73 1.50 1.30 1.09 1.00 0.92
60 2.40 2.03 1.71 1.51 1.29 1.18 1.10
70 2.88 2.40 2.07 1.79 1.54 1.35 1.26
80 3.36 2.7B 2.38 2.10 1.86 1.60 1.42
90 3.74 3.10 2.66 2.34 2.11 1.83 1.67
Source: NCDENR/DWQ Stomtwater Hest aianagemen[ rracnces, pg. ~, hpni ~ 777
STORMWATER BMP 2 -SOUTH - Stormwater Wetland (40% TN Removal)
Land Use Area
(ac) % IA Imp: Area
(ac)
]m ervious 7.24 98 7.1
O en S ace 3.1 0 0.0
Totals 10.34 7.1
Total % Impervious Surface Area = 68.6
Surface Area of Permanent Pool:
Assumed depth = 3 feet
SA/DA ratio = 2.81 °~ From Table 1.1
Minimum pond surface area {SA) _ (DA * SA/DA ratio)/100
SA = 0.291 acres
12673 sq. Ft.
Normal pool elevation = 454.5 feet
Surface area provided = 0.325 acres
14150 sq. ft.
1-Inch Runoff Volume Calculation
Using the runoff volume calculations in the °Simple Method" as described 6y Schueler (7 987)
Rv = 0.05 + 0.009(1) where, Rv =Runoff coefficient, in./in.
I -Percent impervious
Rv = 0.67 in./in.
Total runoff volume from 1-inch precip itation:
Runoff volume, S = (Design rainfall) (Rv) (Drainage Area)
S = 0.575 acre-ft
25057 cu. ft.
Water quality pool elevation= 456.50 feet
Storage volume provided = 0.630 acre-ft
27443 cu. ft.
Project Name: Crossroads Apartments
i / t :Cary, NC
STORMWATER 13MP -Wet Pond (25% TN Removal)
Orifice Calculator
Q =Cd*A*(2gh)^(112)
Variables
WQ Volume:
Head:
Draw downtime:
0.575 Acre-ft
2.00 ft
67 hrs
25056.73 cf
1R
241200 s
Orifice Area =
Orifice Diameter =
0.021575 sq. ft
1.9889 in
3.106815 sq. in
Project #: 2061182
Date: 13-J u1-07
Constants
g = 32.2 ft/s2
Cd = 0.6
USE 2 INCH DIAMETER ORIFICE
DWQ Project No. ~~ ~ ~ - ~ ` ~ ~ y Z
DIVISION OF WATER QUALITY - 401 EXTENDED DETENTION (and POCKET') WETLAND WORKSHEET
I. PROJECT INFORMATION (please complete the following information):
Project Name : crossroads Aoartments
Contact Person: Hi inter C. Freeman, PF Phone Number: 1919 ) 469-3340
For projects with multiple basins, speafy which basin this worksheet applies to: Nnrth Wetland
Permanent Pool Elevation 455.00 ft. (elevation of the orifice invert out)
Temporary Pool Elevation 457.30 ft. (elevation of the outlet structure invert in)
Permanent Pool Surface Area 6459 sq. fk (water surface area at permanent pool elevation)
Drainage Area 5.12 ac. (on-site and off-site drainage to the basin)
Impervious Area 3.58 ac. (on-site and off-site drainage to the basin)
Forebay Surface Area 976 sq. ft (at permanent pool elevation approximately 15%)'
Marsh 0'-9" Surface Area 2327 sq. ik (at permanent pool elevation approximately 35%)'
Marsh 9"-18° Surface Area 2211 sq. ik (at permanent pool elevation approximately 35%)'
Micro Pool Surface Area 942 sq. ft, (at permanent pool elevation approximately 15%)'
Temporary Pool Volume 12680 cu. ft. (volume detained on top of the permanent pool)
SA/DA used 2.81 (surface area to drainage area ratio}'
Diameter of Orifice 1.5 in. (draw down orifice diameter)
II. REQUIRED ITEMS CHECKLIST
Initial in the space provided to indicate the fotlowing design requirements have been met and supporting documentation is attached. !f a
requirement has not been met, attach an explanation of why. At a minimum, a complete stormwater management plan submittal includes
a worksheet for each BMP, design calculations, plans and specfications showing all BMPs and ouUel structure details, a detailed
drainage plan and a fully executed operation and maintenance agreemenk An incomplete submittal package will result in a request for
additional information and will substantially delay final review and approval of the project
The temporary pool controls runoff from the i inch rain.
The basin side slopes are no steeper than 3:1.
A planting plan for the marsh areas with plant speaes and densities is provided.
Vegetation above the permanent pool elevation is specified.
i emergency drain is provided to drain the basin.
~e temporary pool draws down in 2 to 5 days.
:diment storage is provided in the permanent pool.
sediment disposal area is provided.
:cess is provided for maintenance.
A site specific, signed and notarized operation and maintenance agreement is provided.
The drainage area (including any oftsite area) is delineated on a site plan.
Access is provided for maintenance.
Plan details for the wetland are provided.
Plan details for the inlet and outlet are provided.
site specific operation and maintenance agreement, signed and notarized by the responsible party is provided (see
httpJ/h2o.ehnr.state.nc. uslncwetlandsloandm.doc).
Pocket Wetlands have different design parameters and ate only assumed to remove 35% TSS - See pp.19and 20 of the NC DENR
SiormsuatPr BMP MarwaJ, A?rtl 9999. 90% ~ water, 5A°k high marsh, 4D°~ Join marsh.
CONSTRUCTED WETLAND OPERATION AND MAINTENANCE AGREEMENT
The constructed wetland system is defined as the constructed wetland basin, pretreatment including forebays
and the vegetated filter if one is provided. , `~~,
Maintenance activities shall be performed as follows:
After every significant runoff producing rainfall event and at feast monthly:
a. Inspect the constructed wetland system for sediment accumulation, erosion, trash accumulation,
vegetated cover, and genera( 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 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 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 ~-~ feet in the deep pool areas, the sediment shall be
removed. 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 surtace. The soil should not be stockpiled for more than
two weeks.
When the permanent pool depth reads 2-~~+ feet in the forebay and deep pools, the sediment shall be
removed.
BASIN DIAGRAM
(fill in the blanks)
Permanent Pool Elevation ~~ ~ ~
Sediment moval EL ~- ~ 75%
-------------- ~'~ 75%
Sediment Removal Elevation
Bottom E vation __~~ 5 /o . _ ~
FOREBAY MAIN POND
5. Remove cattails and other invasive wetland plants when they cover 50% of the basin surface. 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..
Page 1 of 2
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 constructed wetland 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 eight
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: ~• ~%~'~°'(' l~.tG~~C.-`~
Title: ~~c'~CSi~~1~ /-
Address: ~i~Ci ~ ~-~~~~J~1i~ K-tr CJDU~~L~ "7l~ ! a k `i~AI~~C~ , f~l ~ C. • 7.7~ca ~,
Ph
Sic
uate: ~~ ~ --~ ~ ~
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.~Tl e~ me ~ IC,~ , a Notary Public for the State of ~~-~'1 r~r~~I i n(,~ ,
County of ~,~(~ ke , do hereby certify that Ac ~`- rP_G(~Y ~-f ~ ~ ~h~-~ ~
personally appeared before me this ~ _ day of ~~~~,/ , 2C~Q~_, and acknowledge the due
execution of the forgoing wet (wetland] detention basin maintenance requirements. Witness my hand and
official seal,
`~~~~~uunuprnri
``~~~.~~`,~p't1E M'%,~~,'
_ ~ p1OTAq y
-... ~. _
=, ~'D~18LIG ~ t,~,
SEAL
My commission expires ~~ 7~_j~ . 201
Page 2 of 2
DWQ Project No. ~ X p O'~ - O l0 1 1 Y
DN1510N OF WATER QUALITY - 401 EXTENDED DETENTION {and POCKET') WETLAND WORKSHEET
PROJECT INFORMATION (please complete the following information):
Project Name : Crossroads Aoartments
Contact Person: H. inter (' FrPPman PF Phone Number: b19 1469-334D
For projects with multiple basins, specify which basin this worksheet applies to: Snr nth W .tlanrl
Permanent Pool Elevation 454.50 tt. (elevation of the orifice invert out)
Temporary Pool Elevation 456.50 ft. (elevation of the outlet structure invert in)
Permanent Pool Surface Area 14150 sq. ft. (water surface area at pennanenf pool elevation)
Drainage Area '10.34 ac. (on-site and off-site drainage to the basin)
Impervious Area 7.24 ac. (on-site and aff--site drainage to the basin)
Forebay Surface Area 2055 sq. ft. (at permanent pool elevation approximately 15°h)'
Marsh 0"-9" Surface Area 5317 sq. ft (at permanent pool etevation approximately 35%)*
Marsh 9"-18" Surface Area 4693 sq. ft. (at permanent pool elevation approximately 35%)`
Micro Pool Surface Area 20135 sq. ft. {at permanent pool etevation approximately 15%)'
Temporary Pool Volume 27443 cu. ft. (volume detained on top of the permanent pool)
SAIDA used 2.81 (surface area to drainage area ratio)'
Diameter of Once 2 in. (draw down orifice diameter)
It. REQUIRED ITEMS CHECKLIST
Initial in the space provided to indicate the following design requirements have been met and supporting documentation is attached. -f a
requfremenf has not been met, aftach an explanation of why. At a minimum, a complete stormwater management plan submittal includes
a worksheet for each BMP, design calculations, plans and specifications showing all BMPs and outlet structure details, a detailed
drainage plan and a fully executed operation and maintenance agreement. An incomplete submittal package will result in a request for
additional information and will substantially delay final review and approval of the project
The temporary pool controls runoff from the 1 inch rain.
The basin side slopes are no steeper than 3:1.
planting plan for the marsh areas with plant species and densities is provided.
:gelation above the permanent pool elevation is specified.
~ emergency drain is provided to drain the basin.
re temporary pool draws down in 2 to 5 days.
;diment storage is provided in the permanent pool.
sediment disposal area is provided.
:cess is provided for maintenance.
A site speatic, signed and notarized operation and maintenance agreement is provided.
The drainage area (including any offsite area} is delineated on a site plan.
Access is provided for maintenance.
Plan details for the wetland are provided.
Plan details for the inlet and outlet are provided.
' '~'~ A site specific operation and maintenance agreement, signed and notarized by the responsible party is provided (see
http:ll h2o. ehnr.state.nc.uslncwetlands/oandm.doc).
* Pocket Wetlands have different design parameters and are onty assumed to remove 35% TSS -See pp.19and 20 of the NC DENR
Stormwater BMP Manual, April 1999. 10% open water, 50°~ high marsh, 40% tow marsh.
CONSTRUCTED WETLAND OPERATION AND MAINTENANCE AGREEMENT
The constructed wetland system is defined as the constricted wetland basin, pretreatment including forebays
and the vegetated filter if one is provided.
Maintenance activities shall be performed as follows:
1. After every significant runoff producing rainfall event and at least monthly:
a. Inspect the constructed wetland 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 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 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 ~•~ feet in the deep pool areas, the sediment shall be
removed. 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 excava#ed 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 2•~ feet in the forebay and deep pools, the sediment shall be
removed.
BASIN DIAGRAM
(fill in the blanks)
Permanent Pool Elevation
Sediment moval EI. 75% ~~
-- -Sediment Removal Elevation 75 /o
Bottom E va#ion Q'~1. 5% ~,
0
FOREBAY MAIN POND
5. Remove cattails and other invasive wetland plants when they cover 50% of the basin surface. 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.
Page 1 of 2
6. .f 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 constructed wetland 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 eight
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: l~,• ~~ ~~~~~( .~~~.tGE~,~
Title: ~~ --~.f~~ (D tt~IT
Address: _ ~~ u ~ ~~~ ~tJfL~CC G~• ~•~l.,t~~~•G~ ~~ L• 27 n arC
Phone
Signati
Date: ~ • `t- ~% ~/
Note: The legally responsible party should not be a homeowners association unless more than 50% of the
lots have been` sold and a resident of the subdivision has been named the president.
1, ~(~~1~ I``nP.~ ~~`~- , a Notary Public for the State of ~Qr-~'1 ~'~tro (.~(?C,
County of ~} ")('4 ~~ , do hereby certify that ,~C~1 r PG U~~/ , C-I'Y3 I c
personally appeared before me this ~ day of ~ C( c./ , 2t~1 ,and acknowiedge the due
execution of the forgoing wet [wetland] detention basin maintenance requirements. Witness my hand and
official seal,
`~~«uurnuuii~~~
,. ,~P•,........•• q ,
~.~ .. ,~
~GTA/~y. -;
_ .~ ..-
.,
~'' ~%F ~ ~ 0 U N~ , ; ~ ~ `~~
SEAL
My commission expires ~~, ~ ~(~7C>J~
Page 2 of 2