20110016 Ver 2_Stormwater Info_20110211

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Astoria Apartments Storm Water Narrative
The site is currently undeveloped. The site is being developed with the construction of a new
apartment complex with the associated parking lot, drive aisles and buildings. The site is relatively
flat with natural drainage to the eastern side of the property.
Drainage Area #1
This area drains all of the impervious surfaces from the new construction as well as some off site
area. The storm water will be treated by a permanent wet pond to be located internal to the
development as shown on the drawings. The storm water is conveyed from the new construction
through grassed swales & pipe to the new pond. The pond is connected to a secondary pond that is
extended onto the adjacent parcel where an existing ditch once drained the property. The second
pond overflows into this ditch and drains the site. The second off site pond will serve this
development as well as possible future development on the adjacent parcel to the north. The second
off site pond is being put on its own lot and this lot will be in the name of an owners association that
will operate and maintain the pond. The owners association will be controlled by both of the land
owners that the pond will service. The first wet pond is the forebay for the pond systems initial
treatment. The permanent pool elevation is controlled by a 3.0 inch orifice that is located on the
riser for the pond. The pond is also designed with an emergency spillway to ensure that the pond is
not breached.

DWQ USE ONLY
Date Received Fee Paid Permit Number

Applicable Rules: ^ Coastal SW -1995 ^ Coastal SW - 2008 ^ Ph II -Post Construction
(select all that apply) ^Nop-Coastal SW- HQW/ORW Waters ^ Universal stormwater Management Plan
^ Other WQ M mt Plan:
State of North Carolina
Department of Environment and Natural Resources
Division of Water Quality
STORMWATER MANAGEMENT PERMIT APPLICATION FORM
This form may be photocopied for use as an original
I. GENERAL INFORMATION
1. Project Name (subdivision, facility, or establishment name - should be consistent with project name on plans,
specifications, letters, operation and maintenance agreements, etc.):
Astoria Apartments
2. Location of Project (street address):
Black and Decker Road, between Legion and Hwy 301
City: Near Fayetteville County:Cumberland Zip:28306
3. Directions to project (from nearest major intersection):
From the intersection of Legion & Black and Decker road, follow Black and Decker road 0.28mi, site is on the
left behind an existing church.
4. Latitude:35° 00' 08" N
II. PERMIT INFORMATION:
Longitude:78° 54' 42" W
of the main entrance to the project.
1. a. Specify whether project is (check one): ®New ^Modification
b.If this application is being submitted as the result of a modification to an existing permit, list the existing
permit number ,its issue date (if known) ,and the status of
construction: ®Not Started ^Partially Completed ^ Completed *provide a designer's certification
2. Specify the type of project (check one):
^Low Density ®High Density ^Drains to an Offsite stormwater System ^Other
If this application is being submitted as the result of a previously returned application or a letter from DWQ
requesting a state stormwater management permit application, list the stormwater project number, if
assigned, and the previous name of the project, if different than currently
proposed,
4. a. Additional Project Requirements (check applicable blanks; information on required state permits can be
obtained by contacting the Customer Service Center at 1-877-623-6748):
^CAMA Major
®Sedimentation/Erosion Control: 23.6 ac of Disturbed Area
^NPDES Industrial stormwater ^404/401 Permit: Proposed Impacts
b.If any of these permits have already been acquired please provide the Project Name, Project/Permit Number,
issue date and the type of each permit:
Form SWU-101 Version 07Ju1y2009 Page 1 of 6

III. CONTACT INFORMATION
1. a. Print Applicant /Signing Official's name and title (specifically the developer, property owner, lessee,
designated government official, individual, etc. who owns the project):
Applicant/Organization: William Thorne for Cape Fear Multifamily, LLC
Signing Official & Title:William Thorne, Manager
b. Contact information for person listed in item 1a above:
Street Address:116-A Noth Howe Street
City: Southport State: NC Zip:28461
Mailing Address (if applicable): Same as above
city:
State:
Zip:,
Phone: (910 ) 457-9210 Fax: (910 ) 457-9211
Email: [e-mail]
c. Please check the appropriate box. The applicant listed above is:
® The property owner (Skip to Contact Information, item 3a)
^ Lessee* (Attach a copy of the lease agreement and complete Contact Information, item 2a and 2b below)
^ Purchaser* (Attach a copy of the pending sales agreement and complete Contact Information, item 2a and
2b below)
® Developer* (Complete Contact Information, item 2a and 2b below.)
2. a. Print Property Owner's name and title below, if you are the lessee, purchaser or developer. (This is the
person who owns the property that the project is located on):
Property Owner/Organization: William Thorne /Cape Fear Multifamily
Signing Official & Title: William Thorne, Manager
b. Contact information for person listed in item 2a above:
Street Address: 116-A Howe Street
City: Southport State: NC Zip: 28461
Mailing Address (if applicable): Same as above
city:
State:
Zip:,
Phone: (910 ) 457-9210 Fax: (910 ) 457-9211
Email: [e-mail]
a. (Optional) Print the name and title of another contact such as the project's construction supervisor or other
person who can answer questions about the project:
Other Contact Person/Organization: Chris Pusey, Project Designer
Signing Official & Title:Chris Pusey, President of 4D Site Solutions Inc
b. Contact information for person listed in item 3a above:
Mailing Address:409 Chicago Drive Ste 112
City:Fayetteville State:NC Zip:28306
Phone: (910 ) 426-6777 Fax: (910 ) 426-5777
Email: [e-mail]
4. Local jurisdiction for building permits: Cumberland County Inspections Dept.
Point of Contact:Tom Lloyd Phone #: [phone] )
Form SWU-101 Version 07Ju1y2009 Page 2 of 6

IV. PROJECT INFORMATION
1. In the space provided below, briefly summarize how the stormwater runoff will be treated.
The site has been graded such that all of the storm runoff will drain to a wet pond via open and piped
2. a. If claiming vested rights, identify the supporting documents provided and the date they were approved:
^ Approval of a Site Specific Development Plan or PUD Approval Date:
^ Valid Building Permit Issued Date:
^ Other: Date:
b.Identify the regulation(s) the project has been designed in accordance with:
^ Coastal SW -1995 ®Ph II -Post Construction
3. Stormwater runoff from this project drains to the Cape Fear River basin.
4. Total Property Area: 38.0 acres 5. Total Coastal Wetlands Area: 0.0 acres
6. Total Surface Water Area: 0.0 acres
7. Total Property Area (4) -Total Coastal Wetlands Area (5) -Total Surface Water Area (6) =Total Project
Area+:38.0 acres
Total project area shall be calculated to exclude the follouring: the normal pool of impounded structures, the area
between the banks of streams and rivers, the area below the Normal Hi h Water (NHV~ line or Mean High Water
(MHV~ line, and coastal wetlands landward from the NHW (or MHT~ line. The resultant project area is used to
calculate overall percent built upon area (BUA). Non-coastal wetlands landward of the NHW (or MHW) line may
be included in the total project area.
8. Project percent of impervious area: (Total Impervious Area /Total Project Area) X 100 = 51.6
9. How many drainage areas does the project have?1 (For high density, count 1 for each proposed engineered
stormwater BMP. For low density and other projects, use 1 for the whole property area)
10. Complete the following information for each drainage area identified in Project Information item 9. If there
are more than four drainage areas in the project, attach an additional sheet with the information for each area
provided in the same format as below.
Basin Information Draina e Area 1 Draina e Area _ Draina e Area _ Draina e Area _
Receiving Stream Name Big Sandy Run
Stream Class ~ C
Stream Index Number * 18-31-25
Total Drainage Area (sf) 1,655,331
On-site Drainage Area (sf) 732289
Off-site Drainage Area (sf) 923,042
Proposed Impervious Area~~ (sf) 854,621
Im ervious Area~~ (total) 51.6%
Impervious~~ Surface Area Drainage Area _ Drainage Area _ Drainage Area _ Drainage Area
On-site Buildings/Lots (sf) 171,008
On-site Streets (sf) 237,683
On-site Parking (sf) above
On-site Sidewalks (sf) 37,962
Other on-site (sf) -
Future (sf) 0
Off-site (sf) 407968
Existing BUA*** (sf) 0
Total (sf): 854621
Stream Class and Index Number can be determined at: http://h2o.enr.state.nc.us/bims/reports/reportsWB.html
~~ Impervious area is defined as the built upon area including, but not limited to, buildings, roads, parking areas,
sidewalks, gravel areas, etc.
Form SWU-101 Version 07Ju1y2009 Page 3 of 6

*** Report only that amount of existing BUA that will remain after development. Do not report any existing B UA that
is to be removed and which will be replaced by new B UA.
11. How was the off-site impervious area listed above determined? Provide documentation. The drainage area
was delineated using some ground topo suplemented with LIDAR data
Protects in Union County: Contact DWQ Central Office staff to check if the project is located within a Threatened &
Endangered Species watershed that maybe subject to more stringent stormwater requirements as per NCAC 02B .0600.
V. SUPPLEMENT AND O&M FORMS
The applicable state stormwater management permit supplement and operation and maintenance (O&M) forms
must be submitted for each BMP specified for this project. The latest versions of the forms can be downloaded
fromhttn://h2o.enrstate.nc.us/su/bmn forms.htm.
VI. SUBMITTAL REQUIREMENTS
Only complete application packages will be accepted and reviewed by the Division of Water Quality (DWQ).
A complete package includes all of the items listed below. A detailed application instruction sheet and BMP
checklists are available from http://h2o.enr.state.nc.us/su/bmp_forms.htm. The complete application
package should be submitted to the appropriate DWQ Office. (The appropriate office maybe found by locating
project on the interactive online map at http://h2o.enrstate.nc.us/su/msi_maps.htm.)
Please indicate that the following required information have been provided by initialing in the space provided for
each item. All original documents MUST be signed and initialed in blue ink. Download the latest versions for
each submitted application package from http:/ /h2o.enr.state.nc.us/su/bmp_forms.htm.
Initials
1. Original and one copy of the stormwater Management Permit Application Form.
2. Original and one copy of the signed and notarized Deed Restrictions & Protective Covenants
Form. (if required as per Part VII below)
3. Original of the applicable Supplement Form(s) (sealed, signed and dated) and O&M
agreement(s) for each BMP.
4. Permit application processing fee of $505 payable to NCDENR. (For an Express review, refer to
http://www.envhelp.org/pages/onestopexpress.html for information on the Express program
and the associated fees. Contact the appropriate regional office Express Permit Coordinator for
additional information and to schedule the required application meeting.)
5. A detailed narrative (one to two pages) describing the stormwater treatment/managementfor
the project. This is required in addition to the brief summary provided in the Project
Information, item 1.
6. A USGS map identifying the site location. If the receiving stream is reported as class SA or the
receiving stream drains to class SA waters within 1/z mile of the site boundary, include the 1/z
mile radius on the map.
7. Sealed, signed and dated calculations.
8. Two sets of plans folded to 8.5" x 14" (sealed, signed, & dated), including:
a. Development/Project name.
b. Engineer and firm.
c. Location map with named streets and NCSR numbers.
d. Legend.
e. North arrow.
£ Scale.
g. Revision number and dates.
h. Identify all surface waters on the plans by delineating the normal pool elevation of
impounded structures, the banks of streams and rivers, the MHW or NHW line of tidal
waters, and any coastal wetlands landward of the MHW or NHW lines.
• Delineate the vegetated buffer landward from the normal pool elevation of impounded
structures, the banks of streams or rivers, and the MHW (or NHW) of tidal waters.
i. Dimensioned property/project boundary with bearings & distances.
j. Site Layout with all BUA identified and dimensioned.
k. Existing contours, proposed contours, spot elevations, finished floor elevations.
1. Details of roads, drainage features, collection systems, and stormwater control measures.
Form SWU-101 Version 07Ju1y2009 Page 4 of 6

m. Wetlands delineated, or a note on the plans that none exist. (Must be delineated by a
qualified person. Provide documentation of qualifications and identify the person who
made the determination on the plans.
n. Existing drainage (including off-site), drainage easements, pipe sizes, runoff calculations.
o. Drainage areas delineated (included in the main set of plans, not as a separate document).
p. Vegetated buffers (where required).
9. Copy of any applicable soils report with the associated SHWT elevations (Please identify
elevations in addition to depths) as well as a map of the boring locations with the existing
elevations and boring logs. Include an 8.5"x11" copy of the NRCS County Soils map with the
project area clearly delineated. For projects with infiltration BMPs, the report should also
include the soil type, expected infiltration rate, and the method of determining the infiltration rate.
(Infiltration Devices submitted to WiRO: Schedule a site visit for DWQ to verify the SHWT prior
to submittal, [phone].)
10. A copy of the most current property deed. Deed book: 7832 Page No: 580
11. For corporations and limited liability corporations (LLC): Provide documentation from the NC
Secretary of State or other official documentation, which supports the titles and positions held
by the persons listed in Contact Information, item 1a, 2a, and/or 3a per NCAC 2H.1003(e). The
corporation or LLC must be listed as an active corporation in good standing with the NC
Secretary of State, otherwise the application will be returned.
http: / /www.secretarystate.nc.us /Corporations / CSearch.aspx
VII. DEED RESTRICTIONS AND PROTECTIVE COVENANTS
For all subdivisions, outparcels, and future development, the appropriate property restrictions and protective
covenants are required to be recorded prior to the sale of any lot. If lot sizes vary significantly or the proposed
BUA allocations vary, a table listing each lot number, lot size, and the allowable built-upon area must be provided
as an attachment to the completed and notarized deed restriction form. The appropriate deed restrictions and
protective covenants forms can be downloaded from
http://h2o.enr.state.nc.us/su/bmp forms.htm#deed restrictions. Download the latest versions for each submittal.
In the instances where the applicant is different than the property owner, it is the responsibility of the property
owner to sign the deed restrictions and protective covenants form while the applicant is responsible for ensuring
that the deed restrictions are recorded.
By the notarized signature(s) below, the permit holder(s) certify that the recorded property restrictions and
protective covenants for this project, if required, shall include all the items required in the permit and listed
on the forms available on the website, that the covenants will be binding on all parties and persons claiming
under them, that they will run with the land, that the re quired covenants cannot be changed or deleted
without concurrence from the NC DWQ, and that they will be recorded prior to the sale of any lot.
VIII. CONSULTANT INFORMATION AND AUTHORIZATION
Applicant: Complete this section if you wish to designate authority to another individual and/or firm (such as a
consulting engineer and/or firm) so that they may provide information on your behalf for this project (such as
addressing requests for additional information).
Consulting Engineer: Scott Brown, PE
Consulting Firm: 4D Site Solutions Inc
Mailing Address:409 Chicago Drive Ste. 112
City:Fayetteville
Phone: (910 ) 426-6777
Email: [e-mail]
State:NC Zip:28306
Fax: (910 ) 426-5777
IX. PROPERTY OWNER AUTHORIZATION (if Contact Information, item 2 has been filled out, complete this
section)
I, (print or type name of person listed in Contact Information, item 2a) William Thorne ,certify that I
own the property identified in this permit application, and thus give permission to (print or type name of person
listed in Contact Information, item 1a) William Thorne with (print or type name of organization listed in
Contact Information, item 1b) William Thorne to develop the project as currently proposed. A copy of
the lease agreement or pending property sales contract has been provided with the submittal, which indicates the
party responsible for the operation and maintenance of the stormwater system.
Form SWU-101 Version 07Ju1y2009 Page 5 of 6

As the legal property owner I acknowledge, understand, and agree by my signature below, that if my designated
agent (entity listed in Contact Information, item 1) dissolves their company and/or cancels or defaults on their
lease agreement, or pending sale, responsibility for compliance with the DWQ stormwater permit reverts back to
me, the property owner. As the property owner, it is my responsibility to notify DWQ immediately and submit a
completed Name/Ownership Change Form within 30 days; otherwise I will be operating a stormwater treatment
facility without a valid permit. I understand that the operation of a stormwater treatment facility without a valid
permit is a violation of NC General Statue 143-215.1 and may result in appropriate enforcement action including
the assessment of civil penalties of up to $25,000 per day, pursuant to NCGS 143-215.6.
Signature:
I,
a Notary Public for the State of
do hereby certify that
before me this _ day of
County of
personally appeared
,and acknowledge the due execution of the application for
Date:
a stormwater permit. Witness my hand and official seal,
X. APPLICANT'S CERTIFICATION
SEAL
My commission expires,
I, (print or type name of person listed in Contact Information, item 2) William Thorne
certify that the information included on this permit application form is, to the best of my knowledge, correct and
that the project will be constructed in conformance with the approved plans, that the required deed restrictions
and protective covenants will be recorded, and that the proposed project complies with the requirements of the
applicable stormwater rules under 15A NCAC 2H .1000, SL 2006-246 (Ph. II -Post Construction) or SL 2008-211.
Signature:
I,
a Notary Public for the State of
, do hereby certify that
before me this day of
Date:
County of
personally appeared
,and acknowledge the due execution of the application for
a stormwater permit. Witness my hand and official seal,
SEAL
My commission expires,
Form SWU-101 Version 07Ju1y2009 Page 6 of 6

~,~ 4 D S ITE
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The Astoria at Hope Mills Required Storm Volume
Drainage Area:
38.0 acres
Impervious Area: 854621sf (19.61ac)
Impervious: 51.63%
1 inch Storm Event:
Rv = 0.05+0.009 I
Rv =runoff coefficient
I=percent impervious
Rv=O.05+0.009 * 51.63
= 0.515
For volume that must be controlled:
Volume=3,630*Rd*Rv*A
Volume = 3,630*(1 inch)*(0.515)*38.0 acres = 71039cf
Average Depth of Pond: 3.84
SA/DA ratio: 4.4
Surface Area Required: 72832sf
Surface Area Provided: 116664sf
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NCDENR
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North Carolina Department of Environment and Natural Resources
Beverly Eaves Perdue
Governor
Division of Water Quality
Coleen H, Stallins
Director
Dee Freeman
Secretary
Mr. William Thorne
Atlantic Multifamily, l_l_C
116-A North Howe Street
Sauth~part, NC 28461
September 3, 2010
Subject: Stormwater Permit No. SW61008t#,2
Astoria Aparitments
High I~ensi yr Commercial Wet Pond Project
Cumberland) County
Dear Mr. Thorne:
The Stormwater Permitting Unit received a complete Stormwater Management Permit
Application for Astoria Apartments on August 23, 2010; with additional information received
September 1,.2010: Staff review of the plans and specifications has determined that the project,
as proposed, will comply with the Stormwater Regulations set forth in Title 15A NCAC 2H.1000
and Session Law 2006-24~. We are forwarding Permit No. SW6100802, 21at~c! September 3,
2010, for the construction, operation and maintenance of the subject project and the Stormwater
BMPs.
This permit shall b~e effective from-the date of issui~~~ce until Se tember 3, 2020, and shall be _
subject to the conditions and limitations as specified therein.. Please pay special attention to the
Operation and Maintenance requirements in this permit. Failure to establish an adequate system
far•inspection and maintenance of the Stormwater management system will result in future
compliance problems.
If any parts, requirements, or limitations contained in this permit are unaccepptable, you have the
right to request an adjudicatory hearing upon written request within thirty {30~ days following
receipt of this pern'`it. This request must be m the farm of a written petition, conforming to
Chapter 1506 of the North Carolina General Statutes, and filed with the Office of Administrative
Hearings, P.O. Drawer 27447, Raleigh, NC 27611-7447. Unless such demands are made this
permit shall be final and binding.
This project will be kept on file at the Fayetteville Regional Office. If you it~~ve any questions, or
need additional information concerning this matter, please contact Robert Patterson at {919)
807-6375; or robert.patterson~ncdenr.gov.
Sincerely,
f~~.~..~
ft~r Coleen H. Sullins ,::.~;,
,,
Wetlands and Stormwater Branch Qt1C
1617 Matl Service Cenker, Raleigh, North Carolina 27699-1617 ~Ort.h Carolina
locates: 512 N. Salisbury St. Raleigh, North Carolina 27604 y+
Phone: [phone] FAX: [phone] C~tort~er Service:1-877-623-6748 ~~~~~1 ~'~jlj
Internet: www.ncwaterquality.org J
An Equal Opportunity A Affirmative Action Employer

Channel Report
Hydraflow Express Extension for AutoCAD® Civil 3D® 2011 by Autodesk, Inc.
Astoria -Wet Pond Concrete Channel Outfall
Trapezoidal
Bottom Width (ft) = 5.00
Side Slopes (z:1) = 0.50, 0.50
Total Depth (ft) = 2.50
Invert Elev (ft) = 199.40
Slope (%) = 0.51
N-Value = 0.013
Calculations
Compute by: Known Q
Known Q (cfs) = 64.40
Highlighted
Depth (ft)
Q (cfs)
Area (sgft)
Velocity (ft/s)
Wetted Perim (ft)
Crit Depth, Yc (ft)
Top Width (ft)
EGL (ft)
Sunday, Aug 22 2010
= 1.41
= 64.40
= 8.04
= 8.01
= 8.15
= 1.64
= 6.41
= 2.41
Elev (ft) Section Depth (ft)
202
00 2
60
. .
201
50 2
10
.
201
00 .
1
60
. .
200
50 1
10
.
200
00 .
0
60
.
199
50 .
0
10
. .

199.00
~ aQ tin -0.40
0 90
1 2 3 4
5 6
Reach (ft)
7 8
9 10

DESIGN REQUIREMENTS:
A. Pass the 10 yr storm
Drainage Area, (DA) = 19.40 acres
Intensity, (I) = 5.29 inches/hr
Composite Runoff Coefficient, (C) _> 0.30
Maximum Release Rate, (Qio) _> 30.788 cfs
Drainage Area, (DA) = 38.00 acres
Intensity, (I) = 5.29 inches/hr
Composite Runoff Coefficient, (C) _> 0.64
Peak Release Rate, (Qio) _> 128.65 cfs
Contour Contour Incr. Accum. Stage
Elev. Area Storage Storage (S) (Z)
(ft) (s~ (c~ (c~ (ft) In (S) In (Z) Zest

199.4 - - - - -
199.5 115,664 5,783 5,783 0.10 8.66 -2.30 0.09
200.0 126,102 60,442 66,225 0.60 11.10 -0.51 0.67
200.5 129,296 63,850 130,074 1.10 € 11.78 0.10 1.17
201.0 132,517 65,453 195,527 1.60 € 12.18 0.47 1.62
201.5 135,766 67,071 262,598 2.10 12.48 0.74 2.06
202.0 139,044 68,703 331,301 2.60 € 12.71 0.96 2.49
202.5 146,993 71,509 402,810 3.10 € 12.91 1.13 2.92
Regression Output:
b= 1.23 (X Variable Coef~
Ks= 107,601 (eY-~rr~PC)
Stage -Storage Equation is of the form: S = (Ks)(Z)b
printed: 222011 1:57 PM Page 1 of 2

Barrel
Number of Barrels =
Dia. of Barrel =
Area of Barrel, (Ab) _
Pipe Length, (L) _
Friction Coef£, (Kp) _
Inv. of Barrel =
Riser
Elev. of Riser Crest
Rectangular
Length Weir= 24 inches
Total Weir Length=
Area of Riser =
Dia. of Orifice =
Number of Orifices =
Area of Orifice, (Ab) _
Orifice Coefficient (C~ _
Inv. of Orifice =
Dia. of Orifice =
Number of Orifices =
Area of Orifice, (Ab) _
Orifice Coefficient (C~ _
Inv. of Orifice =
Width of Spillway (Approx.) _
Weir Coefficient =
Crest Elevation =
Maximum Release Rate, (Qio) _
Release Rate, (Qio) _
Normal Water Surface Elev. _
1
24 inches
3.14 sf
65.0 feet
0.01058
199.40 feet
200.75 feet
Width Weii° 36 inches
10.00 feet
6.00 sq. ft.
4.000 inches
1
0.09 sf
0.60
199.50 feet
3.000 inches
1
0.05 sf
0.60
199.50 feet
40 feet
3.3
201.5 feet
30.8 cfs
19.5 cfs
199.50 feet
Water Surface Elev. @ Outlet (Qio) = 201.43 feet
printed: 222011 1:57 PM
Page 2 of 2

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MILE NORTH CAROLINA — CUMBERLAND COUNTY Primary highway,

USDA United States
Department of
Agriculture
o ~ RCS
Natural
Resources
Conservation
Service
A product of the National
Cooperative Soil Survey,
a joint effort of the United
States Department of
Agriculture and other
Federal agencies, State
agencies including the
Agricultural Experiment
Stations, and local
participants
Custom Soil Resource
Report for
Cumberland
County, North
Carolina
4D Site Solutions, Inc

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February 8, 2010

Preface
Soil surveys contain information that affects land use planning in survey areas. They
highlight soil limitations that affect various land uses and provide information about
the properties of the soils in the survey areas. Soil surveys are designed for many
different users, including farmers, ranchers, foresters, agronomists, urban planners,
community officials, engineers, developers, builders, and home buyers. Also,
conservationists, teachers, students, and specialists in recreation, waste disposal,
and pollution control can use the surveys to help them understand, protect, or enhance
the environment.
Various land use regulations of Federal, State, and local governments may impose
special restrictions on land use or land treatment. Soil surveys identify soil properties
that are used in making various land use or land treatment decisions. The information
is intended to help the land users identify and reduce the effects of soil limitations on
various land uses. The landowner or user is responsible for identifying and complying
with existing laws and regulations.
Although soil survey information can be used for general farm, local, and wider area
planning, onsite investigation is needed to supplement this information in some cases.
Examples include soil quality assessments (http://soils.usda.gov/sgin and certain
conservation and engineering applications. For more detailed information, contact
your local USDA Service Center (http://offices.sc.egov.usda.gov/locator/app?
agency=nres) or your NRCS State Soil Scientist (http://soils.usda.gov/contact/
state_officesn.
Great differences in soil properties can occur within short distances. Some soils are
seasonally wet or subject to flooding. Some are too unstable to be used as a
foundation for buildings or roads. Clayey orwet soils are poorly suited to use as septic
tank absorption fields. A high water table makes a soil poorly suited to basements or
underground installations.
The National Cooperative Soil Survey is a joint effort of the United States Department
of Agriculture and other Federal agencies, State agencies including the Agricultural
Experiment Stations, and local agencies. The Natural Resources Conservation
Service (NRCS) has leadership for the Federal part of the National Cooperative Soil
Survey.
Information about soils is updated periodically. Updated information is available
through the NRCS Soil Data Mart Web site or the NRCS Web Soil Survey. The Soil
Data Mart is the data storage site for the official soil survey information.
The U.S. Department ofAgriculture (USDA) prohibits discrimination in all its programs
and activities on the basis of race, color, national origin, age, disability, and where
applicable, sex, marital status, familial status, parental status, religion, sexual
orientation, genetic information, political beliefs, reprisal, or because all or a part of an
individual's income is derived from any public assistance program. (Not all prohibited
bases apply to all programs.) Persons with disabilities who require alternative means

for communication of program information (Braille, large print, audiotape, etc.) should
contact USDA's TARGET Center at [phone] (voice and TDD). To file a
complaint of discrimination, write to USDA, Director, Office of Civil Rights, 1400
Independence Avenue, S.W., Washington, D.C. 20250-9410 or call [phone]
(voice) or [phone] (TDD). USDA is an equal opportunity provider and
employer.

Contents
Preface ...................................................................................................... ..............2
Soil Map ..................................................................................................... .............5
Soil Map (The Astoria at Hope Mills) ....................................................... .............6
Legend .................................................................................................... ..............7
Map Unit Legend (The Astoria at Hope Mills) .......................................... .............8
Map Unit Descriptions (The Astoria at Hope Mills) .................................. .............8
Cumberland County, North Carolina .................................................... ...........10
GoA-Goldsboro loamy sand, 0 to 2 percent slopes ....................... ...........10
LbB-Lakeland-Urban land complex, 1 to 8 percent slopes ............ ...........11
Ra-Rains sandy loam .................................................................... ............12
Wo-Woodington loamy sand ......................................................... ............13
References ................................................................................................ ............15

Soil Map
The soil map section includes the soil map for the defined area of interest, a list of soil
map units on the map and extent of each map unit, and cartographic symbols
displayed on the map. Also presented are various metadata about data used to
produce the map, and a description of each soil map unit.

Custom Soil Resource Report
Soil Map (The Astoria at Hope Mills)
V N
V V
LL~ LL~
W W
r r
35° 0' 26"
35° 0' 4"
v v
~ Map Scale: 1:3,260 if printed on A size (8.5" x 11 ") sheet. N
v v
~' N Meters ~'
0 30 60 120 180
Feet
0 100 200 400 600
35° 0' 26"
35° 0' 3"

Custom Soil Resource Report
MAP LEGEND
Area of Interest (AOI)
Area of Interest (AOI)
Soils
Soil Map Units
Special Point Features
~.; Blowout
® Borrow Pit
Clay Spot
Closed Depression
Gravel Pit
„ Gravelly Spot
~ Landfill
Lava Flow
,y~, Marsh or swamp
}~ Mine or Quarry
O Miscellaneous Water
O Perennial Water
Rock Outcrop
+ Saline Spot
Sandy Spot
Severely Eroded Spot
Sinkhole
Slide or Slip
pr Sodic Spot
„ Spoil Area
Stony Spot
MAP INFORMATION
Very Stony Spot Map Scale: 1:3,260 if printed on A size (8.5" X 11 ") sheet.
~. Wet Spot
The soil surveys that comprise your AOI were mapped at 1:24,000.
~ Other
Special Line Features Please rely on the bar scale on each map sheet for accurate map
-.. Gully measurements.
Short Steep Slope Source of Map: Natural Resources Conservation Service
.~ . Other Web Soil Survey URL: http://websoilsurvey.nres.usda.gov
Coordinate System: UTM Zone 17N NAD83
Political Features
p Cities This product is generated from the USDA-NRCS certified data as of
Water Fea tures the version date(s) listed below.
Oceans
Soil Survey Area: Cumberland County, North Carolina
Streams and Canals Survey Area Data: Version 10, Jun 5, 2009
Transportation
i-F+ Rails Date(s) aerial images were photographed: 6/22/2006
~y,r Interstate Highways The orthophoto or other base map on which the soil lines were
_ -_ US Routes compiled and digitized probably differs from the background
imagery displayed on these maps. As a result, some minor shifting
Major Roads of map unit boundaries may be evident.
~,,f Local Roads

Custom Soil Resource Report
Map Unit Legend (The Astoria at Hope Mills)
Cumberland County, North Carolina (NC051)
Map Unit Symbol Map Unit Name Acres in AOI Percent of AOI
GoA Goldsboro loamy sand, 0 to 2 percent slopes 9.3 34.1 °k
LbB Lakeland-Urban land complex, 1 to 8 percent
slopes 0.6 2.0°k
Ra Rains sandy loam 16.6 60.8°k
Wo Woodington loamy sand 0.8 3.1 °k
Totals for Area of Interest 27.3 100.0%
Map Unit Descriptions (The Astoria at Hope
Mills)
The map units delineated on the detailed soil maps in a soil survey represent the soils
or miscellaneous areas in the survey area. The map unit descriptions, along with the
maps, can be used to determine the composition and properties of a unit.
A map unit delineation on a soil map represents an area dominated by one or more
major kinds of soil or miscellaneous areas. A map unit is identified and named
according to the taxonomic classification of the dominant soils. Within a taxonomic
class there are precisely defined limits forthe properties ofthe soils. On the landscape,
however, the soils are natural phenomena, and they have the characteristic variability
of all natural phenomena. Thus, the range of some observed properties may extend
beyond the limits defined for a taxonomic class. Areas of soils of a single taxonomic
class rarely, if ever, can be mapped without including areas of other taxonomic
classes. Consequently, every map unit is made up of the soils or miscellaneous areas
for which it is named and some minor components that belong to taxonomic classes
other than those of the major soils.
Most minor soils have properties similar to those of the dominant soil or soils in the
map unit, and thus they do not affect use and management. These are called
noncontrasting, or similar, components. They may or may not be mentioned in a
particular map unit description. Other minor components, however, have properties
and behavioral characteristics divergent enough to affect use or to require different
management. These are called contrasting, ordissimilar, components. They generally
are in small areas and could not be mapped separately because of the scale used.
Some small areas of strongly contrasting soils or miscellaneous areas are identified
by a special symbol on the maps. If included in the database for a given area, the
contrasting minor components are identified in the map unit descriptions along with
some characteristics of each. A few areas of minor components may not have been
observed, and consequently they are not mentioned in the descriptions, especially
where the pattern was so complexthat it was impractical to make enough observations
to identify all the soils and miscellaneous areas on the landscape.
The presence of minor components in a map unit in noway diminishes the usefulness
or accuracy of the data. The objective of mapping is not to delineate pure taxonomic

Custom Soil Resource Report
classes but ratherto separate the landscape into landforms or landform segments that
have similar use and management requirements. The delineation of such segments
on the map provides sufficient information for the development of resource plans. If
intensive use of small areas is planned, however, onsite investigation is needed to
define and locate the soils and miscellaneous areas.
An identifying symbol precedes the map unit name in the map unit descriptions. Each
description includes general facts about the unit and gives important soil properties
and qualities.
Soils that have profiles that are almost alike make up a soil series. Except for
differences in texture of the surface layer, all the soils of a series have major horizons
that are similar in composition, thickness, and arrangement.
Soils of one series can differ in texture of the surface layer, slope, stoniness, salinity,
degree of erosion, and other characteristics that affect their use. On the basis of such
differences, a soil series is divided into soil phases. Most of the areas shown on the
detailed soil maps are phases of soil series. The name of a soil phase commonly
indicates a feature that affects use or management. For example, Alpha silt loam, 0
to 2 percent slopes, is a phase of the Alpha series.
Some map units are made up of two or more major soils or miscellaneous areas.
These map units are complexes, associations, or undifferentiated groups.
A complex consists of two or more soils or miscellaneous areas in such an intricate
pattern or in such small areas that they cannot be shown separately on the maps. The
pattern and proportion of the soils or miscellaneous areas are somewhat similar in all
areas. Alpha-Beta complex, 0 to 6 percent slopes, is an example.
An association is made up of two or more geographically associated soils or
miscellaneous areas that are shown as one unit on the maps. Because of present or
anticipated uses of the map units in the survey area, it was not considered practical
or necessary to map the soils or miscellaneous areas separately. The pattern and
relative proportion of the soils or miscellaneous areas are somewhat similar. Alpha-
Beta association, 0 to 2 percent slopes, is an example.
An undifferentiated group is made up of two or more soils or miscellaneous areas that
could be mapped individually but are mapped as one unit because similar
interpretations can be made for use and management. The pattern and proportion of
the soils or miscellaneous areas in a mapped area are not uniform. An area can be
made up of only one of the major soils or miscellaneous areas, or it can be made up
of all of them. Alpha and Beta soils, 0 to 2 percent slopes, is an example.
Some surveys include miscellaneous areas. Such areas have little or no soil material
and support little or no vegetation. Rock outcrop is an example.

Custom Soil Resource Report
Cumberland County, North Carolina
GoA-Goldsboro loamy sand, 0 to 2 percent slopes
Map Unit Setting
Elevation: 80 to 330 feet
Mean annual precipitation: 38 to 55 inches
Mean annual air temperature: 59 to 70 degrees F
Frost-free period: 210 to 265 days
Map Unit Composition
Goldsboro and similar soils: 90 percent
Minor components: 5 percent
Description of Goldsboro
Setting
Landform: Flats on marine terraces, broad interstream divides on marine terraces
Landform position (two-dimensional): Summit
Down-slope shape: Linear
Across-slope shape: Linear
Parent material: Loamy marine deposits
Properties and qualities
Slope: 0 to 2 percent
Depth to restrictive feature: More than 80 inches
Drainage class: Moderately well drained
Capacity of the most limiting layer to transmit water (Ksat): Moderately high to high
(0.57 to 1.98 in/hr)
Depth to water table: About 24 to 36 inches
Frequency of flooding: None
Frequency of ponding: None
Available water capacity: Moderate (about 8.0 inches)
Interpretive groups
Land capability (nonirrigated): 2w
Typical profile
0 to 8 inches: Loamy sand
8 to 15 inches: Loamy sand
15 to 45 inches: Sandy clay loam
45 to 80 inches: Sandy clay loam
Minor Components
Rains, undrained
Percent of map unit: 5 percent
Landform: Flats on marine terraces, Carolina bays on marine terraces, broad
interstream divides on marine terraces
Landform position (two-dimensional): Summit
Down-slope shape: Linear
Across-slope shape: Linear
10

Custom Soil Resource Report
LbB-Lakeland-Urban land complex, 1 to 8 percent slopes
Map Unit Setting
Elevation: 160 to 660 feet
Mean annual precipitation: 38 to 52 inches
Mean annual air temperature: 61 to 70 degrees F
Frost-free period: 210 to 245 days
Map Unit Composition
Lakeland and similar soils: 40 percent
Urban land: 30 percent
Description of Lakeland
Setting
Landform: Low hills
Landform position (two-dimensional): Summit
Landform position (three-dimensional): Crest
Down-slope shape: Convex
Across-slope shape: Convex
Parent material: Sandy marine deposits and/or eolian sands
Properties and qualities
Slope: 0 to 8 percent
Depth to restrictive feature: More than 80 inches
Drainage class: Excessively drained
Capacity of the most limiting layer to transmit water (Ksat): High to very high (5.95
to 19.98 in/hr)
Depth to water table: More than 80 inches
Frequency of flooding: None
Frequency of ponding: None
Available water capacity: Low (about 4.0 inches)
Interpretive groups
Land capability (nonirrigated): 4s
Typical profile
0 to 6 inches: Sand
6 to 48 inches: Sand
48 to 80 inches: Sand
Description of Urban Land
Interpretive groups
Land capability (nonirrigated): 8
11

Custom Soil Resource Report
Ra-Rains sandy loam
Map Unit Setting
Elevation: 80 to 330 feet
Mean annual precipitation: 38 to 55 inches
Mean annual air temperature: 59 to 70 degrees F
Frost-free period: 210 to 265 days
Map Unit Composition
Rains, drained, and similar soils: 80 percent
Rains, undrained, and similar soils: 10 percent
Description of Rains, Drained
Setting
Landform: Flats on marine terraces, carolina bays on marine terraces, broad
interstream divides on marine terraces
Landform position (two-dimensional): Summit
Down-slope shape: Linear
Across-slope shape: Linear
Parent material: Loamy marine deposits
Properties and qualities
Slope: 0 to 2 percent
Depth to restrictive feature: More than 80 inches
Drainage class: Poorly drained
Capacity of the most limiting layer to transmit water (Ksat): Moderately high to high
(0.20 to 1.98 in/hr)
Depth to water table: About 0 to 12 inches
Frequency of flooding: None
Frequency of ponding: None
Available water capacity: High (about 9.4 inches)
Interpretive groups
Land capability (nonirrigated): 3w
Typical profile
0 to 7 inches: Sandy loam
7 to 12 inches: Fine sandy loam
12 to 20 inches: Sandy loam
20 to 62 inches: Sandy clay loam
62 to 85 inches: Sandy clay loam
Description of Rains, Undrained
Setting
Landform: Flats on marine terraces, carolina bays on marine terraces, broad
interstream divides on marine terraces
Landform position (two-dimensional): Summit
Down-slope shape: Linear
12

Custom Soil Resource Report
Across-slope shape: Linear
Parent material: Loamy marine deposits
Properties and qualities
Slope: 0 to 2 percent
Depth to restrictive feature: More than 80 inches
Drainage class: Poorly drained
Capacity of the most limiting layer to transmit water (Ksat): Moderately high to high
(0.20 to 1.98 in/hr)
Depth to water table: About 0 to 12 inches
Frequency of flooding: None
Frequency of ponding: None
Available water capacity: High (about 9.4 inches)
Interpretive groups
Land capability (nonirrigated): 4w
Typical profile
0 to 7 inches: Sandy loam
7 to 12 inches: Fine sandy loam
12 to 20 inches: Sandy loam
20 to 62 inches: Sandy clay loam
62 to 85 inches: Sandy clay loam
Wo-Woodington loamy sand
Map Unit Setting
Elevation: 80 to 330 feet
Mean annual precipitation: 38 to 55 inches
Mean annual air temperature: 59 to 70 degrees F
Frost-free period: 210 to 265 days
Map Unit Composition
Woodington, drained, and similar soils: 80 percent
Woodington, undrained, and similar soils: 10 percent
Description of Woodington, Drained
Setting
Landform: Flats on marine terraces, depressions on marine terraces, broad
interstream divides on marine terraces
Down-slope shape: Linear
Across-slope shape: Concave
Parent material: Loamy marine deposits
Properties and qualities
Slope: 0 to 2 percent
Depth to restrictive feature: More than 80 inches
Drainage class: Poorly drained
Capacity of the most limiting layer to transmit water (Ksat): High (1.98 to 5.95 in/hr)
Depth to water table: About 0 to 12 inches
13

Custom Soil Resource Report
Frequency of flooding: None
Frequency of ponding: None
Available water capacity: Moderate (about 7.0 inches)
Interpretive groups
Land capability (nonirrigated): 3w
Typical profile
0 to 4 inches: Loamy sand
4 to 12 inches: Loamy sand
12 to 47 inches: Sandy loam
47 to 85 inches: Sandy loam
Description of Woodington, Undrained
Setting
Landform: Flats on marine terraces, depressions on marine terraces, broad
interstream divides on marine terraces
Down-slope shape: Linear
Across-slope shape: Concave
Parent material: Loamy marine deposits
Properties and qualities
Slope: 0 to 2 percent
Depth to restrictive feature: More than 80 inches
Drainage class: Poorly drained
Capacity of the most limiting layer to transmit water (Ksat): High (1.98 to 5.95 in/hr)
Depth to water table: About 0 to 12 inches
Frequency of flooding: None
Frequency of ponding: None
Available water capacity: Moderate (about 7.0 inches)
Interpretive groups
Land capability (nonirrigated): 6w
Typical profile
0 to 4 inches: Loamy sand
4 to 12 inches: Loamy sand
12 to 47 inches: Sandy loam
47 to 85 inches: Sandy loam
14

References
American Association of State Highway and Transportation Officials (AASHTO). 2004.
Standard specifications for transportation materials and methods of sampling and
testing. 24th edition.
American Society for Testing and Materials (ASTM). 2005. Standard classification of
soils for engineering purposes. ASTM Standard D2487-00.
Cowardin, L.M., V. Carter, F.C. Golet, and E.T. LaRoe. 1979. Classification of
wetlands and deep-water habitats of the United States. U.S. Fish and Wildlife Service
FWS/OBS-79/31.
Federal Register. July 13, 1994. Changes in hydric soils of the United States.
Federal Register. September 18, 2002. Hydric soils of the United States.
Hurt, G.W., and L.M. Vasilas, editors. Version 6.0, 2006. Field indicators of hydricsoils
in the United States.
National Research Council. 1995. Wetlands: Characteristics and boundaries.
Soil Survey Division Staff. 1993. Soil survey manual. Soil Conservation Service. U.S.
Department of Agriculture Handbook 18. http://soils.usda.gov/
Soil Survey Staff. 1999. Soil taxonomy: A basic system of soil classification for making
and interpreting soil surveys. 2nd edition. Natural Resources Conservation Service,
U.S. Department of Agriculture Handbook 436. http://soils.usda.gov/
Soil Survey Staff. 2006. Keys to soil taxonomy. 10th edition. U.S. Department of
Agriculture, Natural Resources Conservation Service. http://soils.usda.gov/
Tiner, R.W., Jr. 1985. Wetlands of Delaware. U.S. Fish and Wildlife Service and
Delaware Department of Natural Resources and Environmental Control, Wetlands
Section.
United States Army Corps of Engineers, Environmental Laboratory. 1987. Corps of
Engineers wetlands delineation manual. Waterways Experiment Station Technical
Report Y-87-1.
United States Department of Agriculture, Natural Resources Conservation Service.
National forestry manual. http://soils.usda.gov/
United States Department of Agriculture, Natural Resources Conservation Service.
National range and pasture handbook. http://www.glti.nres.usda.gov/
United States Department of Agriculture, Natural Resources Conservation Service.
National soil survey handbook, title 430-VI. http://soils.usda.gov/
United States Department of Agriculture, Natural Resources Conservation Service.
2006. Land resource regions and major land resource areas of the United States, the
Caribbean, and the Pacific Basin. U.S. Department of Agriculture Handbook 296.
http://soils.usda.gov/
15

Custom Soil Resource Report
United States Department of Agriculture, Soil Conservation Service. 1961. Land
capability classification. U.S. Department of Agriculture Handbook 210.
16

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ASTORIA APARTMENTS
STORM WATER CALCULATIONS
January 11, 2011

Example City,
Precipitation Data Chart From: http://hdsc.nws.noaa.gov/hdsc/pfds/
Intensity, Peak 10 -yr, 24 -hr
d(in)/24hr 0.22 in/hr
Depth at 24hr& 10 -yr: d= 5.36 in
Intensity, Peak 1 -yr, 24 -hr
d(in)/24'hr 0.12 in/hr;
Depthat 24h'r& 1 -yr: d= 2.98 in
Intensity, Peak 10 -yr
d(in)/t,(min)*60(min/hr)
Depth at T, & 10 -yr: d=
Intensity, Peak 1 -yr
d(in)/t,(min)*60(min/hr)
Depth at T, & 1 -yr: d=
Time of Conc.: Tc=
=(L3/H).385/128
Hydraulic Length, L
Change in Elev., H
4.66 in/hr
1.16 in
0.28 in/hr
0.72 in
14.93 min (Calculate this value from the hydraulic length and the change in elevation
along the hydraulic length)
1000 ft Furthest distance water flows to BMP (Example Site)
3 ft Over hydraulic length (Example Site)
Precipitation
requency
Estimates
inches
AR1*
(years)
5
min
10
min
15
min
30
min
60
min
120
min
3
hr
6
hr
12
hr
24
hr
48
hr
4
day
7
day
10
day
20
day
30
day
45
day
60
day
1
0.36
0.58
0.72
0.99
1.23
1.44
1.6
2
2.5
2.98
3.58
4.04
4.68
5.37
7.16
8.87
11.2
13.3
2
0.43
0.69
0.86
1.19
1.49
1.75
1.9
2.4
3
3.62
4.32
4.87
5.6
6.4
8.48
10.4
13.1
15.5
5
0.51
0.81
1.03
1.46
1.88
2.22
2.4
3
3.7
4.59
5.44
6.05
6.83
7.7
10
12
14.8
17.5
10
0.57
0.91
1.16
1.67
2.18
2.6
2.8
3.4
4.3
5.36
6.31
6.97
7.78
8.68
11.2
13.2
16.1
18.9
25
0.65
1.04
1.32
1.95
2.6
3.15
3.4
4.2
5.1
6.42
7.51
8.23
9.06
9.97
12.8
14.8
17.8
20.7
50
0.71
1.14
1.44
2.17
2.94
3.61
3.9
4.8
5.7
7.28
8.47
9.23
10.1
11
14
15.9
19
22.1
100
0.78
1.24
1.56
2.4
3.3
4.1
4.5
5.4
6.4
8.16
9.46
10.2
11.1
12
15.3
17
20.1
23.4
200
0.84
1.34
1.69
2.63
3.68
4.62
5.1
6.1
7.1
9.09
10.5
11.3
12.1
13
16.5
18.1
21.3
24.6
500
0.931
1.471
1.851
2.941
4.221
5.41
61
7.11
8.1
10.41
11.91
12.7
13.41
14.31
18.1
19.5
22.7
26.2
1000
1 1
1.571
1.971
3.21
4.671
6.051
6.71
81
8.91
11.41
131
13.81
14.51
15.31
19.4
20.51
23.71
27.3
Intensity, Peak 10 -yr, 24 -hr
d(in)/24hr 0.22 in/hr
Depth at 24hr& 10 -yr: d= 5.36 in
Intensity, Peak 1 -yr, 24 -hr
d(in)/24'hr 0.12 in/hr;
Depthat 24h'r& 1 -yr: d= 2.98 in
Intensity, Peak 10 -yr
d(in)/t,(min)*60(min/hr)
Depth at T, & 10 -yr: d=
Intensity, Peak 1 -yr
d(in)/t,(min)*60(min/hr)
Depth at T, & 1 -yr: d=
Time of Conc.: Tc=
=(L3/H).385/128
Hydraulic Length, L
Change in Elev., H
4.66 in/hr
1.16 in
0.28 in/hr
0.72 in
14.93 min (Calculate this value from the hydraulic length and the change in elevation
along the hydraulic length)
1000 ft Furthest distance water flows to BMP (Example Site)
3 ft Over hydraulic length (Example Site)

Green: Interpolated value not in BMP Manual
Percent
Table 10-1:
Piedmont/Mountains 85%
Table 10-2:
Coastal 85%
Table 10-3: Piedmont/Mountains 90%
Table 10-4: Coastal 90%
Impervious
Permanent Pool Average Depth (ft)
Permanent Pool Average Depth (ft)
Permanent Pool Average Depth (ft)
Permanent Pool Average Depth (ft)
Cover
3.0
3.5
4.0
4.5 5.0
5.5
6.0
6.5 7.0
7.5
8.0
8.5 9.0
3.0
3.5
4.0
4.5
5.0
5.5
6.0
6.5
7.0
7.5 3.0
3.5
4.0
4.5 5.0
5.5 6.0
6.5 7.0
7.5
8.0
8.5 9.0
3.0
3.5
4.0
4.5
5.0
5.5
6.0
6.5
7.0
7.5
0%
1%
2%
3%
4%
5%
6%
7%
8%
9%
10%
0.59
0.54
0.49
0.46' 0.43
0.39'
0.35
0.33'' 0.31
0.30'
0.29
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4.02
3.70
3.42 3.20
2.94 2.74
2.64 ' 2.52
2.34 2.24
2.08 1.98`
9.14 '
7.80 '
6.80
6.22
5;56
5.06
4.46
3.88
''3.30
2.70'
0
79 /0
3.31
3..0.3 2.74
' 2.55.. '
2.35
2.21
2.07
1.95' 1.83
'1.70
1.58
'
1.49 1.40
6.72
5.92..5.13
4.64
4.15
3.66
3.17
'.2.68
..2.19
1..98 4.45
4.06'>�
3.75
.3.46 '
3.25
2.97 2.77
2.67 ' 2.56
2.37.. 2.27
2..09 1.99>�
9.27 '
7.90 '
6.90
6.31
5;63
5.1''3
4.53
3.94
''3.35
80%
3.36
3.07 2.78
''2.58' 2.38
2.24' 2.10
1.98'' 1.86
''1.73'
1.60
1.51' 1.42
6.80
6.00
5.20
4.70
4.20
3.70
3.20
2.70
2.20
2.00 4.50
4.10
3.80
3.50 3.30
3.00 2.80
2.70 2.60
2.40 2.30
2.10 2.00
9.40
8.00
7.00
6.40
5.70
5.20
4.60
4.00
3.40
2.80
0
81 /0
3.40
3.1.1
2.81
''2.61 2.41
.2.27 2.12
2.00' 1.89
'11.75
1-,62
1.53 1.45
6.87-'
6.05
.5.26
4.176
4.26
3.76'
3.26
''2.76
2.26
2.03 4.55
4.14''
3.82
3.53 3.32
3.03 2.82
2.72 ''2.62
2.43 2.33
2.1.4 2.04''
9.53 '
8.10 '
7.09
6.48
5.78
5.27
4.66
4.06
''3.45
2.85'
0
82 /0
3.44
3.14 2.$4
' 2.64 2.44
2.29 '
2.15
2.03' 1.91
'1.78
'
1.65
1.56 1.47
6.941,
6.10
.5.32
4.82
4.32
3.82
3.32
'.2.82
.2.32
2.06 4.60
4.18'
3.84
3.56 '
3.34
3.06 '
2.84
2.74 ' 2.64
2.46 2.36
2.18 2.08`
9.66 '
8.20 '
7.18
6.56
5;86
5.34
4.72
4.12
''3.50
2.90'
0
83 /0
3.47
3.1.8 2.$8
' 2.67.. '
2.46
2.32 2.17
2.05 1.94
'1.80
1.67
'
1.58 1.50
7.01'
6.15..5.38
4.88
4.38
3.88
3.38
'.2.88
..2.38
.2.09 4.65
4.22'>�
3.86
.3.59 '
3.36
3.09 `'
2.86
2.76 ' 2.66
2.49. 2.39
2..22 2.12
9.79 '
8.30 '
7.27
6.64
5;94
5.41
4.78
4.18
''3.55
2.95
0
84 /0
3..51
3.21
2.91
''2.70 2.49
2.34 2.20
2.08'' 1.96
''1.83
1.'',69
1.61 1.52
7.08.'
6.20
.5.44
4.94
4.44
3.94'
3.44
''2.94
.2.44
2.12 4.7.0
4.26.'
3.88
3.62 3.3$
312 2.88
2.78 2.68
.2.52 2.42
2.26 2.16'.'
9.92 '
8.40 '
7.36
6.72
6..02
5.48
4.84
4.24
3.60
3.00.'
0
85 /0
3.55
3..25 2.94
' 2.73.. '
2.52
2.37 2.22
2.10' 1.99
'11.85
1.72
'
1.63 1.55
7.15'-'-
6.25..5.50
5.00
4.50
4.00
3.50
'3.00
..2.50
2.15 4.75
4.30'
3.90
3.65 '
3.40
3.15 `'
2.90
2.80 ' 2.70
2.55 2.45
2.30 2.20'
10.05''
8.50 '
7.45
6.80
6;10
5.55
4.90
4.30
''3.6513.05.'
0
86 /0
3..59
3.28 2.97
' 2.76 .2.55
2.40 2.24
2.13'' 2.01
''.1.87
1.'',74
1.65 1.57
7.221
6.30
.5.56
5.06
4.56
4.06'
3.56
''3.06
.2.56
2.18 4.8.0
4.34''
3.92
.3.68 3.42
318 2.92
2.82 ''2.72
..2.58 2.48
2.34 2.24'
10.18'
8.60 '
7.54
.6.88
6.18
5.62
4.96
4.36
''3.70
3.10.'
0
87 /0
3.63
3..32
3.00
'2.79.. '
2.58
2.42 2.27
2.15' 2.04
'1.90
1.76
'
1.68 1.60
7.29
6.35..5.62
5.92
4.62
4.12
3.62
'3.12
..2.62..2.21
4.85
4.38'>�
3.94
.3.71 3.44
.3..21 '
2.94
2.84 ' 2.74
2.61.
2.51
2.38 2.28
10.31 '
8.70 '
7.63
6.96
6;26
5.69
5.02
4.423.75
3.15'--
0
88 /0
3.66
3.3.5
3.04
''2.82 2.60
2.45 2.29
2.1$'' 2.06
''1.92
1.'',78
1.70 1.62
7.36.'
6.40
5.6$
5.18
4.6$
4.18'
3.6$
3.18
.2.68
2.24 4.9.0
4.42.'
3.96
3.74 3.46
3.24 2.96
2.$6 ''2.76
.2.64 2.54
2.42 2.32'.'
10.44'
8.80 '
7.72
7.04
6..34
5.76
5.08
4.48
''3.$0
3.20.'
0
89 /0
3.70
3.39
3.07
' 2.85.. '
2.63
2.47 2.32
2.20' 2.09
'11.95
1.$1
1.73 1.65
7.43'-'-
6.45..5.74
5.24
4.74
4.24
3.74
'3.24
..2.74..2.27
4.95
4.46'
3.98
3.77 3.4$
3.27 2.98
2.88 ' 2.7$
2.67. 2.57
2.46 2.36'
10.57''
8.90 '
7.81
7.12
6;42
5.83
5.14
4.54
''3.$5
3.25'
90%
3.74
3.42
3.10
2.88 2.66
2.50 2.34
2.23'' 2.11
''1.97'
1.83
1.75' 1.67
7.50
6.50
5.80
5.30
4.80
4.30
3.80
3.30
2.80
2.30 5.00
4.50 4.00
3.80 3.50
3.30 3.00
2.90 2.80
2.70 2.60
2.50 2.40
10.70
9.00
7.90
7.20
6.50
5.90
5.20
4.60
3.90
3.30
91%
7.57
6.59
5.90
5.39
4.88
4.37
3.86
''3.35
2.84
2.33
10.83'
9.10
7.99
7.29
6-:58
5.97
5.26
4.65
3.94
3.33'
92%
7.64'
6.68
6.00
5.48
4.96
4.44'
3.92
''3.40
2.88
2.36
10.96'
9.20
8.08
7.38
6.66
6.04
5.32
4.70
3.98
3.36'
93%
7.71
6.77
6.10
5.57
5.04
4.51'
3.98
''3.45
2.92
2.39
11.09'
9.30
8.17
7.47
6.74
6.11
5.38
4.75
4.02
3.39'
94%
7.781
6.86
6.20
5.66
5.12
4.58'
4.04
''3.50
2.96
2.42
11.22'
9.40
8.26
7.56
6.82
6.18
5.44
4.80
4.06
3.42'
95%
7.85
6.95
6.30
5.75
5.20
4.65'
4.10
''3.55
3.00
2.45
11.35'
9.50
8.35
7.65
6.90
6.25
5.50
4.85
4.10
3.45'
96%
7.92'
7.04
6.40
5.84
5.28
4.72'
4.16
'3.60
3.04
2.48
11.48'
9.60
8.44
7.74
6.98
6.32
5.56
4.90
4.14
3.48'
97%
7.99'-'-
7.13
6.50
5.93
5.36
4.79'
4.22
''3.65
3.08
2.51
11.61'
9.70
8.53
7.83
7.06
6.39
5.62
4.95
''4.18
3.51'
98%
8.061
7.22
6.60
6.02
5.44
4.86'
4.28
''3.70
3.12
2.54
11.74
9.80
8.62
7.92
7.14
6.46
5.68
5.00
''4.22
3.54'
99%
8.13
7.31
6.70
6.'11
5.52
4.93'
4.34
''3.75
3.16
2.57
11.87
9.90
8.71
8.01
7.22
6.53
5.74
5.05
4.26
3.57'
100%
8.20
7.40
6.80
6.20
5.60
5.00
4.40
3.80
3.20
2.60
12.00
10.00
8.80
8.10
7.30
6.60
5.80
5.10
4.30
3.60

riuurr iu-cu
Average f permanent pool to use the SAIDA tables ft
mm
Option : dar

Figure 3-2b: Determining Orifice Driving Head, Two Outlet Structure Configurations
(-. veril xv Weir
(-)Verfl0IV J�� cir
{Higher thaii Temp Pc(:)ir}
{mit top of Temp Focx�}
Temporary F}o�x1'{:'c�rlt{ul
Additioiial Vol mie
Head oit {',_AACe R. .._ .,...�
Z)ri-v ilig Head,H,,—H; 3-. ......
I�crrzr��irrrt �c��:�l
L)ri�-i<i He ad,H� H .........
Pcri���rrcrr#. F���1
Orifice
Orifice

Permit No.
(to be provided by DWQ)
__
STORMWATER MANAGEMENT PERMIT APPLICATION FORM
401 CERTIFICATION APPLICATION FORM
WET DETENTION BASIN SUPPLEMENT
This form must be filled ouf, printed and submitted.
The Required Items Checklist (Part III) must be printed, filled out and submitted along with all of the required information,
I. PROJECT INFORMATION
Project name Astoria Apartments
Contact person Scott Brown
Phone number 910-426-6777, ext 102
Date 23-Feb-10
Drainage area number 1
II. DESIGN INFORMATION
Site Characteristics
Drainage area 1,655,331 ft2
Impervious area, post-development 854,621 ft2
impervious 51.63
Design rainfall depth 1.0 in
Storage Volume: Non•SA Waters
Minimum volume required 71,039 ft3 OK
Volume provided 149,989 ft3
OK, volume provided is equal to or in excess of volume required.
Storage Volume: SA Waters
1.5" runoff volume
Pre-development 1-yr, 24-hr runoff
Post-development 1-yr, 24-hr runoff
Minimum volume required
Volume provided
Peak Flow Calculations
Is the prelpost control of the 1 yr 24hr storm peak flow required?
1-yr, 24-hr rainfall depth
Rational C, pre-development
Rational C, post-development
Rainfall intensity.1-yr, 24-hrstorm
Pre-development 1-yr, 24-hr peak flow
Post-development 1-yr, 24-hr peak flow
PrelPost 1-yr, 24-hr peak flow control
Elevations
Temporary pool elevation
Permanent pool elevation
SHWT elevation (approx. at the perm, pool elevation)
Top of 10ft vegetated shelf elevation
Bottom of 10ft vegetated shelf elevation
Sediment cleanout, top elevation (bottom of pond)
Sediment cleanout, bottom elevation
Sediment storage provided
Is there additional volume stored above the state-required temp, pool?
Elevation of the top of the additional volume
ft3
ft3
ft3
ft3
ft3
Y (Y or N)
3.0 in
0.20 (unitless)
0.64 (unitless)
0.13 inlhr OK
0,85 ft3lsec
3,16 ft3lsec
2,31 ft3lsec
200.66 fmsl
199.50 fmsl
199.00 fmsl
200.00 fmsl
199.00 fmsl Data not needed forcalculation option #1, but OK if provided.
191.00 fmsl
190.00 fmsl Data not needed forcalculation option #1, but OK if provided.
1.00 ft
y (Y or N)
201.5 fmsl Insufficient. Must equal the temp, pool elev. previously entered.
Form SW401-Wet Detention Basin-Rev.8-9117/09 Parts I. & II. Design Summary, Page 5 of 7

Permit No.
(to be provided by DWQ)
II. DESIGN INFORMATION
Surface Areas
Area, temporary pool 130,327 ft2
Area REQUIRED, permanent pool 72,835 ft2
SAIDA ratio 4.40 (unitless)
Area PROVIDED, permanent pool, Aperm_pool 116,664 ft1 OK
Area, bottom of 10ft vegetated shelf, Ab°t shelf 104,360 ft1
Area, sediment cleanout, top elevation (bottom of pond), Abot_p°nd 86,175 ft1
Volumes
Volume, temporary pool 149,989 ft3 OK
Volume, permanent pool, Uperm_pool 448,553 ft3
Volume, forebay (sum of forebays if more than one forebay) 97,551 ft3
Forebay % of permanent pool volume 21,7% % OK
SAIDA Table Data
Design TSS removal 90
Coastal SAIDA Table Used? Y (Y or N)
MountainlPiedmontSAlDA Table Used? N (Y or N)
SAIDA ratio 4,40 (unitless)
Average depth (used in SAIDA table);
Calculation option 1 used? (See Figure 10-2b) Y (Y or N)
Volume, permanent pool, Vperm_pool 448,553 ft~
Area provided, permanent pool, Aperm_pool 116,664 ft1
Average depth calculated 3.84 ft OK
Average depth used in SAIDA, daV, (Round to nearest 0.5ft) 4.0 ft OK
Calculation option 2 used? (See Figure 10-2b) N (Y or N)
Area provided, permanent pool, Aperm_pool 116,664 ft1
Area, bottom of 10ft vegetated shelf, Abot shelf 104,360 ft1
Area, sediment cleanout, top elevation (bottom of pond), Ab°t_pond 86,175 ft2
"Depth" (distance blw bottom of 10ft shelf and top of sediment) 8,00 ft
Average depth calculated ft
Average depth used in SAIDA, daV, (Round to nearest 0.5ft) ft
Drawdown Calculations
Drawdown through orifice? Y (Y or N)
Diameter of orifice (if circular) 3 & 4 in
Area of orifice (if-non-circular) in2
Coefficient of discharge (Co) 0.60 (unitless)
Driving head (H°) 0.42 ft
Drawdown through weir? N (Y or N)
Weir type (unitless)
Coefficient of discharge (CW) (unitless)
Length of weir (L) ft
Driving head (H) ft
Pre-development 1-yr, 24-hr peak flow 0.85 ft3lsec
Post-development 1-yr, 24-hr peak flow 3.16 ft3lsec
Storage volume discharge rate (through discharge orifice or weir) 0.42 ft3lsec
Storage volume drawdown time 4.10 days OK, draws down in 2-5 days.
Additional Information
Vegetated side slopes 3 ;1 OK
Vegetated shelf slope 10 ;1 OK
Vegetated shelf width 10.0 ft OK
Length of flowpath to width ratio 4 ;1 OK
Length to width ratio 4.6 ;1 OK
Trash rack for overflow & orifice? y (Y or N) OK
Freeboard provided 1.5 ft OK
Vegetated filter provided? n (Y or N) OK
Recorded drainage easement provided? Y (Y or N) OK
Capures all runoff at ultimate build-out? y (Y or N) OK
Drain mechanism for maintenance or emergencies is; pump
Form SW401-Wet Detention Basin-Rev.8-9117/09 Parts I. & II. Design Summary, Page 6 of 7

Permit No.
(to be provided by DWQ)
III. REQUIRED ITEMS CHECKLIST
Please indicate the page or plan sheet numbers where the supporting documentation can be found. An incomplete submittal package will
result in a request for additional information. This will delay final review and approval of the project. Initial in the space provided to
indicate the following design requirements have been met. If the applicant has designated an agent, the agent may initial below. If a
requirement has not been met, attach justification.
Pagel Plan
Initials Sheet No.
1. Plans (1" - 50' or larger) ofthe entire site showing:
- Design at ultimate build-out,
-Off-site drainage (if applicable),
-Delineated drainage basins (include Rational C coefficient per basin),
-Basin dimensions,
-Pretreatment system,
-High flow bypass system,
-Maintenance access,
-Proposed drainage easement and public right of way (ROW),
-Overflow device, and
- Boundaries of drainage easement.
2. Partial plan (1" = 30' or larger) and details for the wet detention basin showing:
-Outlet structure with trash rack or similar,
-Maintenance access,
-Permanent pool dimensions,
- Forebay and main pond with hardened emergency spillway,
-Basin cross-section,
-Vegetation specification for planting shelf, and
-Filter strip.
3. Section view of the wet detention basin (1" = 20' or larger) showing:
-Side slopes, 3:1 or lower,
-Pretreatment and treatment areas, and
-Inlet and outlet structures.
4. If the basin is used for sediment and erosion control during construction, clean out of the basin is specified
on the plans prior to use as a wet detention basin.
5. A table of elevations, areas, incremental volumes & accumulated volumes for overall pond and for forebay,
to verify volume provided.
6. A construction sequence that shows how the wet detention basin will be protected from sediment until the
entire drainage area is stabilized.
1. The supporting calculations.
8. A copy of the signed and notarized operation and maintenance (0&M) agreement.
9. A copy of the deed restrictions (if required).
10. A soils report that is based upon an actual field investigation, soil borings, and infiltration tests. County
soil maps are not an acceptable source of soils information.
Form SW401-Wet Detention Basin-Rev.8-9117/09 Part III. Required Items Checklist, Page 7 of 7