20061581 Ver 4_Riparian Buffer Authorization_20170330

s] Ksraynr Orivt
sins
Cary, horth s 27511
ADVANCED ph 919.460.2024
C I V I L i7 E S I C N faxlm316a$127
TRANSMITTAL LETTER
Date: March 28, 2017
Re: Bowling Green Subdivision — Site #2
Buffer Impact Authorization
Attn: Ms. Karen Higgins
Please find attached:
D GC�12OWE
D
MAR 3 .1 2011
DEO-WATER RES UCS
1 & BUFFER PERMITTING
Reference No.
Copies
Number
of Sheets
Notes
12-0001-512
1
5
Original Signed Riparian Buffer Authorization Form
12-0001-512
2
5
Copy of Signed Riparian Buffer Authorization Form
12-0001-512
3
1
Portion of USGS Quadmap "Rolesville, NC" 2013
12-0001-512
3
1
Portion of Wake County Soil Survey Map, Sheet 15
12-0001-512
3
1
Previous Stream Buffer Determination
12-0001-512
3
1
Signed Agent Authorization Form
12-0001-512 1
1
1
11x17 of Drawing C.8.0 "Wet Detention Pond"
12-0001-512 1
2
1
1 24x36 of Drawing C.8.0 "Wet Detention Pond"
12-0001-512 1
3
2
1 Wet Detention Basin Supplement
Ms. Higgins,
The attached items have been provided for review and acceptance. Please call me with any
questions or concerns.
Sincerely,
ADVANCED CIVIL DESIGN, INC.
Owixt ra-- A- A cc_
Cameron M. Rice, P.E.
Project Manager
cc: 12-0001-512
advancedcivildesign. com
NORTI-I CAR01ANA • OF110

15A NCAC 02B.0233 (8)(b),.0243 (8)(b),.0250 (11)(b),.0259 (8)(b),.0267 (11)(c),.0607 (e)(2) -Buffer Authorization
FORM: BA 10-2013
Riparian Buffer Authorization Form
A.
Applicant Information
1.
Project Information
'im
ow Lg in)
1a. Name of project:
Site 2
1 b. County:
Wake U MAR .10 2017-
1 c. Nearest municipality:
Town of Wake Forest
=-.,T;Z;:.
1d. Subdivision name:
Bowling Green U S
1 e. Is the project located in any of North Carolina's twenty coastal counties?
If yes, answer 1 f below.
FER PER I
1f. Is the project located within a NC Division of Coastal Management Area of
Environmental Concern (AEC)?
❑ Yes ® No
2.
Owner Information
2a. Name on Recorded Deed:
Bowling Green Associates, LLC
2b. Deed Book and Page No.
DB 010891, Pg 00001
2c. Map Book and Page No.
(include a copy of the
recorded map that indicates
when the lot was created):
Not available
2d. Responsible Party
for Corporations):
Bowling Green Associates, LLC
2e. Street address:
833-A Wake Forest Business Park
2f. City, state, zip:
Wake Forest, NC 27587
2g. Telephone no.:
919-556-2030
2h. Fax no.:
n/a
2i. Email address:
[e-mail]
3.
Applicant Information (if different from owner)
3a. Applicant is:
® Agent ❑ Other, specify:
3b. Name:
3c. Business name
if applicable):
3d. Street address:
3e. City, state, zip:
3f. Telephone no.:
3g. Fax no.:
3h. Email address:
4.
Agent/Consultant Information (if applicable)
4a. Name:
Cameron M. Rice, PE
4b. Business name
if applicable):
Advanced Civil Design, Inc.
4c. Street address:
51 Kilmayne Drive, Suite 105
4d. City, state, zip:
Cary, NC 27511
4e. Telephone no.:
919-535-4056
4f. Fax no.:
n/a
4g. Email address:
[e-mail]
FORM: BA 10-2013 Page 1 of 5

B. Project Information and Prior Project History
1. Property Identification
1a. Property identification no. (tax PIN or parcel ID): 1850457918
1 b. Site coordinates (in decimal degrees): Latitude: 35.963261 Longitude: -78.476948
1c. Property size: 7.11 acres
2. Surface Waters
2a. Name of nearest body of water to proposed project: Unnamed Tributary to Austin Creek
2b. Water Quality Classification of nearest receiving water: C; NSW
2c. River basin: Neuse
3. Project Description
3a. Describe the existing conditions on the site and the general land use in the vicinity of the project at the time of
this application:
The subject property is a 7.11 acre parcel located north of Main Divide Drive and approximately
400 feet southwest of the intersection of Main Divide Drive and Fern Hollow Trail in the Bowling
Green Subdivision in Wake Forest, North Carolina. It is the last phase of the subdivision to be completed.
Currently, the site is mostly wooded with a river buffer to the west. Existing single family use is located to the
east and west with undeveloped land to the north. A portion of the site has been cleared and graded, but a
majority of the site is still wooded. 812 linear feet of existing 8" DIP sewer is located along the northern and
western propert lines.
3b. Attach an 8 '/ x 11 excerpt from the most recent version of the USGS topographic map indicating the location
of the site
3c. Attach an 8'/ x 11 excerpt from the most recent version of the published County NRCS Soil Survey Map
depicting the project site
3d. List the total estimated linear feet of all existing streams (intermittent and perennial) on the property:
345 LF
3e. Explain the purpose of the proposed project:
39 Lot single family residential subdivision
3f. Describe the overall project in detail, including the type of equipment to be used:
The project proposes 39 single family homes with rear loaded 2 -car garages. Private alleys provide access to
the garages that will connect to public streets. The project will connect to the City of Raleigh public water and
sewers stems. Standard earth moving equipment will be utilized.
4. Jurisdictional Determinations
4a. Have jurisdictional wetland or stream determinations by
® Yes ❑ No ❑ Unknown
the Corps or State been requested or obtained for this
Comments: NBRRO 03-270
property/ project(including all priorphases) in thepast?
4b. If yes, who delineated the jurisdictional areas?
Agency/ Consultant Company: Froehling &
Name (if known): Matthew Stetter
Robertson, Inc.
Other:
4c. If yes, list the dates of the Corps jurisdictional determinations or State determinations and attach
documentation.
December 11, 2003
FORM: BA 10-2013 Page 2 of 5

S. Project History
5a. Have permits or certifications been requested or obtained
® Yes ❑ No ❑ Unknown
for this project(including all priorphases) in thepast?
5b. If yes, explain and detail according to "help file" instructions.
December 11, 2003 - Neuse River Basin Buffer Determination (NBRRO 03-270)
June 2, 2004 - Town of Wake Forest Master Plan and Rezoning Approval
July 19, 2005 - NCDENR Water Main Extension
June 20, 2005 - NCDENR-DWQ Wastewater Collection System Extension
August 23, 2006 - 404 approval (SAW -2006-40424-292)
July 31, 2006 - 401 approval (03-1581)
April 7, 2006 - Town of Wake Forest Grading Permit
May 8, 2008 - NCFMP Letter of Map Revision Approval
April 7, 2006 - Town of Wake Forest Grading Permit
October 22, 2013 - Town of Wake Forest Master Plan and Rezoning Approval
March 28, 2017 - Stream Determination for Site #2
6. Future Project Plans
6a. Is this a phased project? ® Yes ❑ No
6b. If yes, explain.
This will be a two 2phased project with 17 lots in the first phase and 22 lots with the second phase.
C. Proposed Impacts Inventory
1. Buffer Impacts
1a. Project is in which protected basin?
Neuse Tar -Pamlico Catawba
❑ Randleman ❑ Jordan ❑ Goose Creek
1 b. Individually list all buffer impacts below. If any impacts require mitigation, then you MUST fill out Section D of
this form.
Buffer impact
Reason for
Type of impact
Stream name
Buffer
Zone 1
Zone 2
number —
impact
(exempt, allowable,
mitigation
impact
impact
Permanent (P)
allowable w/
required?
(sq ft)
(sq ft)
or Temporary
mitigation)
T
61 ❑ P ® T
site slope> 12%
exempt
UT to Austin
❑ Yes ® No
0
4,167
(320-263)/458
Creek
stormwater
B2 ®P ❑ T
outfall from
allowable
UT to Austin
❑ Yes ® No
0
400
management
Creek
facility
B3 ❑ P T
Yes ❑ No
64 P T
LJ Yes LJ No
B5 aP T
Yes No
B6 ❑ P ❑ T
❑Yes ❑ No
Total buffer impacts
0
67
4,5::]
1c. Comments:
FORM: BA 10-2013 Page 3 of 5

D. Impact Justification and Mitigation
1. Avoidance and Minimization
1a. Specifically describe measures taken to avoid or minimize the proposed impacts in designing project.
This design, in particular, limits the area of disturbance and environmental impacts in the most achievable
manner, by preserving aquatic life, habitat, and protecting water quality. The proposed impervious area was
minimized by utilizing existing Main Divide Drive to front Lots 14-25. The project's extensive use of retaining
walls minimized impacts and addressed grading challenges associated with the existing topography,
1 b. Specifically describe measures taken to avoid or minimize the proposed impacts through construction
techniques. Silt fence and a temporary sediment basin has been proposed to minimize sediment from
enterine buffers and streams during construction. A wet pond has been proposed to improve water quality and
reduce runoff.
2. Buffer Mitigation
2a. Will the project result in an impact within a protected riparian buffer that
Yes No
requires buffer mitigation?
2b. If yes, then identify the square feet of impact to each zone of the riparian buffer that requires mitigation and
calculate the amount of mitigation required in the table below.
Zone
Reason for impact
Total impact
Multiplier Required mitigation
(square feet
square feet
Zone 1
3 (2 for Catawba)
Zone 2
1.5
Total buffer mitigation required:
2c. If buffer mitigation is required, is payment to a mitigation bank or NC DMS ❑ Yes ❑ No
proposed?
2d. If yes, attach the acceptance letter from the mitigation bank or NC DMS.
2e. If no, then discuss what type of mitigation is proposed.
2f. Comments:
E. Diffuse Flow Plan
All buffer impacts and high ground impacts require diffuse flow or other form of
❑ Diffuse flow
stormwater treatment. Include a plan that fully documents how diffuse flow will be
® Other BMP
maintained. If a Level Spreader is proposed, attach a Level Spreader Supplement Form.
If due to site constraints, a BMP other than a level spreader is proposed, please provide a
plan for stormwater treatment as outlined in Chapter 8 of the NC Stormwater BMP
Manual and attach a BMP Supplement Form.
FORM: BA 10-2013 Page 4 of 5

F. Supplementary Information
1. Environmental Documentation
1 a. Does the project involve an expenditure of public (federal/state/local) funds or the
❑ Yes ® No
use of public federal/state land?
1 b. If you answered "yes" to the above, does the project require preparation of an
❑ Yes ❑ No
environmental document pursuant to the requirements of the National or State (North
Carolina) Environmental Policy Act NEPA/SEPA ?
1 c. If you answered "yes" to the above, has the document been finalized by the State
❑ Yes ❑ No
Clearing House? (If so, attach a copy of the NEPA or SEPA final approval letter.)
Comments:
2. Violations
2a. Is the site in violation of DWR Wetland Rules (15A NCAC 02H .0500), Isolated
❑ Yes ® No
Wetland Rules (15A NCAC 02H .1300), DWR Surface Water or Wetland Standards,
or Riparian Buffer Rules 15A NCAC 02B .0200)?
2b. Is this an after -the -fact permit application?
❑ Yes ® No
2c. If you answered "yes" to one or both of the above questions, provide an explanation of the violation(s):
t4QC45- 3 2a/r7
Applicant/Agent's Printed Name Applicant/Agent's Signature Date
(Agent's signature is valid only if an authorization letter from the applicant is provided.)
Send 3 complete sets of this form and accompanying documents to the following:
For government transportation projects sent by
First Class Mail via the US Postal Service:
NC DWR, Transportation Permitting Unit
1617 Mail Service Center
Raleigh, NC 27699 - 1617
For all other projects sent by First Class Mail via
the US Postal Service
For government transportation projects sent by
delivery service (UPS, FedEx, etc.):
OR NC DWR, Transportation Permitting Unit
512 N. Salisbury Street
Raleigh, NC 27604
For all other projects sent by delivery service
(UPS, FedEx, etc.):
Karen Higgins Karen Higgins
NCDWR — 401 & Buffer Permitting Branch OR NCDWR — 401 & Buffer Permitting Branch
1617 Mail Service Center 512 N. Salisbury Street
Raleigh, NC 27699 - 1617 Raleigh, NC 27604
FORM: BA 10-2013 Page 5 of 5

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Michael F. Easley, Governor NDEr.R
William G. (Bill) Ross, Secretary
Division of Water Quality
December 11, 2003
inc.
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S U 0� F5 C'E Ne'Llse Rive! Basin Buffer R?jles
NBRRO 0'3-270
8ovAng Greem
Wake, Forest, Wake COURVIV. NIC
Dear Mr. ste!lec
On Septemb-.-�,r 10, 20033. 1 cond"ted a site visit of 'eatures A. 6, C. D. E and F in oh
'e, OF
M t -a above rel p,,uje-.,t as identified On the Xtached maps. It was dete,= -Ld that tiie
,ealo; es shc%wn or, County Soil Sjrvey and on the USGS Rolesville, NC Quad map coulij
pctentfal;y be subject to ,'�r!Ntection uridef the NeUSe River Basin. Nutrient Sensitive vvafets
Managerlemt Strategy, Pro te-,;ion and
T i5 k- 0213.023" OXAC 02331, Feature A is not subject, Features B, C and D arc a1 SLbject
the prnpf-ty: FealLre E is sub"ect, ongir -ts *0
tnt s been
Ft: <Vure F is subje�c'&, its orig"n as been delineated and ftggc-d as 912-cA30 iculvert at
ft is sur jpct Uirou ail to ffacj,4111,51. Hovv*ver, fea. tv r-,-- Fit', not subject friar flag #1.01 to 1,91ag 1150,7 a[` r'
tt'tien
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then 'N'orn flag #5507 to the, (:onflluence of fell'ure 6 (flag '501 j, fe-a-hire P is subiect
This ;elter cnkly L*ie appficabiht� of trie Neuse Suffer Ruje.<,. For inforwia!0
re!;,--V3nt *o Quaikv %rligkatons, weUands and othe< impacts to ',,,vatem of the si-Ite',
Piezise ccraact the Cenn- I Offirce at 733-17116. (Note* if is 401 Water Quafityon recis -d �c'
i
Pease be rer, iinded not to beg'41. your porojecr, un j) t1r',e celtficafim has beer, receiveed,) Thank yo�)
,or flouranentionto this ro-n-tter ardi if tnLsaff�ce can be -of any as�stance or it You �ave addilional
quest0orts. please do not hasitate to contact. us.
S;nGer-ely.
Deborah Edvv?rjs
Er-�-,'ronrneentat Speeciaiis-. I
John 0om-aiVVVC1
Wake Gaunt,
16-28 Mai) Servicv Caal*r, kah*i gh. NC 27699.1$28
An Equal Opportunity Affirmadvo Action Employer 50"to recyclt*10% gest-consumes paper

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PROPERTY LEGAL DESCRIPTION:
LOT NO.
n/a
AGENT AUTHORIZATION FORM
PLAN NO. n/a PARCEL ID: - 1850457918
STREET ADDRESS: Main Divide Drive
Wake Forest, NC 27587
Bowling Green Associates, LLC
Please print:
Property Owner: by: Horsecreek Associates, Inc., its manager
Property Owner:
A
The undersigned, registered property owners of the above noted property, do hereby authorize
Cameron M. Rice of Advanced Civil. Design, Inc.
(Contractor Agent) (Nam of consulting firm)
to act on my behalf and take all actions necessary for the processing, issuance and acceptance of
this permit or certification and any and all standard and special conditions attached.
.Property Owner's Address (if different than property above):
833-A Wake Forest Business Park, Wake Forest, NC 27587
Telephone: [phone]
We hereby certify the above information submitted in this application is true and accurate to the
best of our knowledge.
Bowling Green Associates, LLC
Advanced Civil Design, Inc. by: Norseareek Associates, Inc., its Nanageai
by: `
Cameron M. Rice
Authorized Signature
/
Date:. 7' Zdl /?
by:�
Stephen C. Gould, ;Vice President
Authorized Signature
Date: J- •'•0 -17

•
Permit No
It (to be provided by DWQ)
�'�
IA
OF W A T�9
"'" �E`
NCDENR
p T
Impervious area, post -development
STORMWATER MANAGEMENT PERMIT APPLICATION FORM
% impervious
401 CERTIFICATION APPLICATION FORM
Design rainfall depth
WET DETENTION BASIN SUPPLEMENT
This form must be filled out, printed and submitted.
The Required Items Checklist (Part III) must be printed, filled out and submitted along with all of the required information.
1. PROJECT INFORMATION
Project name
Bowling Green Subdivision - Charleston Collection - Site #2
Contact person
Cameron M. Rice
Phone number
919-780-8005
Date
20 -Jan -17
Drainage area number
1
IL DESIGN INFORMATION
Site Characteristics
Drainage area
252,850 ftz
Impervious area, post -development
147,378 fe
% impervious
58.29 %
Design rainfall depth
1.0 in
Storage Volume: Non -SA Waters
Minimum volume required
Volume provided
Storage Volume: SA Waters
1.5" runoff volume
Pre -development 1 -yr, 24 -hr runoff
Post -development 1 -yr, 24 -hr runoff
Minimum volume required
Volume provided
Peak Flow Calculations
Is the pre/post control of the 1 y 24hr storm peak flow required?
1 -yr, 24 -hr rainfall depth
Rational C, pre -development
Rational C, post -development
Rainfall intensity: 1 -yr, 24 -hr storm
Pre -development 1 -yr, 24 -hr peak flow
Post -development 1 -yr, 24 -hr peak flow
Pre/Post 1 -yr, 24 -hr peak flow control
Elevations
Temporary pool elevation
Permanent pool elevation
SHWT elevation (approx. at the perm. pool elevation)
Top of 1 Oft vegetated shelf elevation
Bottom of 1 Oft 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
Form SW401-Wet Detention Basin-Rev.9-4/18/12
12,107 ft3
14,356 ft3
OK, volume provided is equal to or in excess of volume required.
ft3
ft3
ft3
ft3
ft3
(Y or N)
3.0 in
_ (unitless)
_(unitless)
0.13 in/hr OK
ft3/sec
ft3 /sec
ft3/sec
273.70 fmsl
272.00 fmsl
265.00 fmsl
fmsl
fmsl
267.50 fmsl
266.50 fmsl Data not needed for calculation option #1, but OK if provided.
1.00 ft
(Y or N)
fmsl
Parts I. & It. Design Summary, Page 1 of 2

Permit
(to be provided by DWQ)
•
11.= DESIGN INFORMATION
Drawdown through orifice?
Y
Surface Areas
Diameter of orifice (if circular)
Area, temporary pool
9,363 ftz
Area REQUIRED, permanent pool
5,917 ftp
int
SAIDA ratio
2.34 (unitless)
Area PROVIDED, permanent pool, Ap,_pw
7,360 ftz
OK
Area, bottom of 1Oft vegetated shelf, Abd shelf
f[
Area, sediment cleanout, top elevation (bottom of pond), AbN,md
3,263 ftz
(Y or N)
Volumes
Weir type
Volume, temporary pool
14,356 ft3
OK
Volume, permanent pool, Vpempod
23,066 ft3
Volume, forebay (sum of forebays if more than one forebay)
5,020 ft3
It
Forebay % of permanent pool volume
21.8% %
OK
SAIDA Table Data
Pre -development 1 -yr, 24 -hr peak flow
Design TSS removal
85 %
Coastal SAIDA Table Used?
n (Y or N)
2.90 ft3 /sec
Mountain/Piedmont SAIDA Table Used?
y (Y or N)
SAIDA ratio
2.34 (unitless)
Storage volume drawdown time
Average depth (used in SAIDA table):
1.00 days
Insufficient drawdown time. Must be within 2-5 days.
Calculation option 1 used? (See Figure 10-2b)
Y (Y or N)
Volume, permanent pool, Vp,.-Pool
23,066 ft3
Area provided, permanent pool, Ape _pw
7,360 ftz
Vegetated shelf slope
Average depth calculated
3.13 ft
OK
Average depth used in SAIDA, da,, (Round to nearest 0.5ft)
3.0 ft
OK
Calculation option 2 used? (See Figure 10-2b)
N (Y or N)
Area provided, permanent pool, Apermyod
7,360 ftz
Length to width ratio
Area, bottom of 1 Oft vegetated shelf, Abot shelf
ftz
OK
Area, sediment cleanout, top elevation (bottom of pond), Abot-p.d
3,263 ft2
(Y or N)
"Depth" (distance b/w bottom of 1Oft shelf and top of sediment)
-267.50 ft
Average depth calculated
ft
Vegetated filter provided?
Average depth used in SAIDA, d,,,, (Round to down to nearest 0.5ft)
ft
OK
Drawdown Calculations
Drawdown through orifice?
Y
(Y or N)
Diameter of orifice (if circular)
2.75 in
Area of orifice (if -non -circular)
int
Coefficient of discharge (CD)
0.60 (unitless)
Driving head (Ho)
1.19 ft
Drawdown through weir?
N
(Y or N)
Weir type
(unitless)
Coefficient of discharge (C.)
(unitless)
Length of weir (L)
It
Driving head (H)
ft
Pre -development 1 -yr, 24 -hr peak flow
4.86 ft3 /sec
Post -development 1 -yr, 24 -hr peak flow
2.90 ft3 /sec
Storage volume discharge rate (through discharge orifice or weir)
0.35 ft3/sec
Storage volume drawdown time
1.00 days
Insufficient drawdown time. Must be within 2-5 days.
Additional Information
Vegetated side slopes
3 :1
OK
Vegetated shelf slope
n/a :1
OK
Vegetated shelf width
n/a ft
OK
Length of flowpath to width ratio
5 :1
OK
Length to width ratio
5.0 :1
OK
Trash rack for overflow & orifice?
Y
(Y or N)
OK
Freeboard provided
1.0 ft
OK
Vegetated filter provided?
n/a
(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:
Gravity
Form SW401-Wet Detention Basin-Rev.9-4/18/12 Parts I. & II. Design Summary, Page 2 of 2

WET POND GRAPHIC SCALE
PLAN VIEW
(ixlQr)
I IRRh - 20 tL
PLAN VIEW OF RISER STRUCTURE
NOT TO SCALE
AS
TRASH GUARD
NOT TO SCALE
YET DETENTION POND: BASIN SIZING. CALCUTATION6 AND REWRELENT3
RETURN
EVENT
(YR)
PRE -DEV.
RELEASE
RATE (CFS)
POST -DEV.
RELEASE
RATE (CFS)
ARCA Fdt PT]IM4NIdT oea
TOFAL OUNME MEA 7O SARI: 0.60 5►
06
BASIN Bor1aM D£/ATIOe 267.30 (260.50 PRI FOR 1' OF SEDIMENT STORAGE)
IMPERVIOUS AREA DRAINING TO BASIN: 136 AC
FaQBAY BOTTOM ELEVATIONS 267.50 (2M.60 PROV. FOR 1. OF SEDIMENT STORAGE)
PERCENT OF IMPERVIOUS FOR DRANAGE AREA: 50.31E
00
PERMANENT POOL ELEVA710011: 272PERMANENT
POOL
SURFACE AREA/DRAINAGE AREA RATIO (AVERAGE DEP : 3 Ft. SA/OAk 234
TEMPORARY POOL ELEVATION: 173.70
REQUIRED SURFACE AREA: SA _ (234/loor(&GO AC) -(43,560 SF/AC)
PERMANENT POOL SURFACE AREA. 7,360 6F
- 017 >F
PROVIDED SURFACE AREA. SA _ 7,360 SF
IMPERVIOUS AREA DRAINING TO POO 30.30
SURFACE AREA PROVIDED > SURFACE AREA REQUIRED
PERMANENT POOL VOLUMIL ,066 OF
TEMPORARY POOL VOLUME 14.336 OF
7.360 SF > 5.017 SF
FORERAY VOLUME: 5.020 O (-21.6
M UIRm M ME TO CONTROL THE Y STORM
AVERAGEBASIN LENGTHAT PERMANENT POOL' 100 FT
35.32
AVERAGE BASIN MOTH AT PERMANENT POOL• 25 FT
RUNOFF COEFFICIENT (R7FJ: STORM RUNOFF (RN) / STORM RAINFALL M)
PERCENT IMPERVIOUS (D: DRAINAGE AREA (ACJ / IMPERVIOUS PORTION OF DA
BASIN LENGTH TO MTN RA710 > k1
INTERICIR BASIN DE 2 t 2:1
(M')
WIDOW 1111
EXTERIOR BASH WE SLOPES 3:1
RV - 0.03 + .009 ' Q)
BERM ELEVATION: 276!0
- 0.05 + .009 (363)
FO EBAY SOME ELEVATION: 27200
- 0.77 N/IN
REQ. VOL. FROM 1' OF RUNOFF- (DESIGN RAINFALL) 4 (RV) ' (DRAINAGE MEA)
REOI1Wm AVERAGE eFPTIH
50 AC) -(43,550 SF/AC)-(1FN)
1 0.37 IN/INY(6T/iB
2/ CF
ASSUMED PERMANENT POOL AVERAGE DEPTH FROM TABLE 10-1 - 3 FT
(SEDIMENT LEVEL)
VOLUME OF PERMANENT PO2: 23.066 OF
• VOLUME FROM 1 -INCH PROVIDED BETWEEN ELEVATIONS 27200 AND 273.70
AREA OF PERMANENT POOL: 7.360 SF
PROVIDED VOLUME FROM 1' OF RUNOFF - 14.356 OF
OEC( AVERAGE DEPTH OF PERMANENT POOL WITH ASSUMED AVERAGE DEPTH
14,535 OF > 12107 OF
DWNq - F23066 OF / 7.360 SFl
wmumm eNF,rF dAMETER FdR 2-s ekr dRAw OOMN
TEMPORARY POOL VOLUME - 14,356 CF
HEIGHT OF TEMPORARY POOL _ 1.70 FT
ASSUMED INITIAL DRAWDOWN ORIFICE OAYETER OF 273 INCHES
INITIAL DRIVING HEAD - (1.70 - 0.113) - 1.33 FT
ASSUMED DRIVING HEAD - 1.70 -0.113 - 0.33 R
...REFLECTSHEAD DECK NO OVER 71 V -
DRAWDOWN TINE - 2 DAY OR 172300 SEC
FLOW
ANTE - 14=41 OF AMBOO SEC - GLOBS CFS
ORIFICE COEFFICIENT - 0.5
AREA - 0/C)/SOR7(2'G'H)
aae3/ae) =Tj(zp(32z) (a33p
l26 SO N
DIAMETER _ BORT(AREA• 4)/P
SORTj(125)W(4)/3.14j
_ 20 INCHES
USE 20 INCHES
STORMWATER MANAGEMENT SUMMARY
RETURN
EVENT
(YR)
PRE -DEV.
RELEASE
RATE (CFS)
POST -DEV.
RELEASE
RATE (CFS)
STORAGE
PROVIDED
(CF)
MAX WATER
SURFACE ELEV.
(FT)
1
4.66
2.51
16,146
274.10
2
7.61
10.94
21.447
274.43
10
1609
34.35
25,719
274.65
100
35.32
41.41
32.091
275.49
Dmq - 1J
DGV9 > ASSUMED AVC. W17H FROM TABLE 10-1
113>_ SO
BLOYANC'/ r•, dlLAnd13
WEIGiT f1F d]Ilf3FiE feOW1WARe FRN(>1
RISER: (2(4•,0.67') + 2(5.33.0.57')) . ILS - 105 OF
Fo nNG: 1' X0.3J x6.33'-67 CF
Gram 6.5' x s' X 4' -BO CF
CONCRETE VOLUME X CONCRETE DENSITY .
- 1p CF + S7 OF + 66 C) X 150 LBS./GF
150 Les
RISER: all' X 0.33' X 0.3' - 241 OF
FOOTINGe V X 9.3S X 9.33' - 67.00 OF
WATER VOLUME X WATER DENSITY
- (241 OF +17 CF) X 024 LBS/CF
10,467 IBS. < 42.150 LBS.
SdMGTl1RE MILL NOT FLOAT
NOTES
1. PLACEMENT OF ANY FILL MARTIAL MUST BE CONDDCIED UNDER
THE OBSERVATION OF A QUALIFIED LICENSED GEOTEC MKX
ENGINEER AND UPON CO PLETION OF THE EARTHWORK ACTIVITIES
THE TONIN MUST BE PROVIDED WITH A FINK GRADING REPORT THAT
INCLUDES THE C�ONDING COMPACTION TEST RESULTS AND
CERTIFIES THE TYPE OF FILL MATERIAL AND ITS
PROPER PLACEMENT.
2. EMBANKMENT !HALL BE CONSTRUCTED OF CLEAN STRUCTURAL
SOL. FREE OF ROOTS. VEGETATION. ROCKS AND 07HER
OBJECTIONABLE MATERIAL SCARIFY SURFACES BEFORE PLACING FILL
PLACE FILL IN 6-6 INCH LOOSE LIFCOMPACT TO AT LEAST 930
THE
STANDARD ANDARD PROCTOR DENSITY.
1 8-12 NOTES 0 CLAY SOL (MXNIMUMI 1A PASSING THE M12Do
SIEVE AND A MAXIMUM PERYEAM TY OF (1 X 1r-3 L>I/SEC)
SHALL BE PLACED ALONG THE DAM EMBAN(MENT AT AAIIDD BELOW
THE NORMAL POOL OF 267.00 TO SUSTAIN A PERMANENT POOL
RPRAPON
CLAS! 1 STONE
Dae.
WO -6'
Date
OMAN - r
IRON THICKNESS
- 14'
OUTLET PIPE
Dat.
Attaaklny
1C
2' I.D. PVC PIPE WTH 9r SENO
INV. DEV. - 27200
RIP RAP SECTION VIEW
City .T R009N NWk Utlitlp D.pm
NOT TO SCALL
PERMANENT POOL - 37200
TOP OF BON BEY. - 276.50
IDG TIL STORM ELEV. - 27149
t0 I'll. STORM ELEV. - 37465
TOP OF RISER - 274.20
Dae.
3 - 4'A2' WOR
Date
Erwlan k S.6EnmL Cmbd
DRN
IN DEV. - 373.]0
Dat.
Attaaklny
3000 PSI RDNF.
2' I.D. PVC PIPE WTH 9r SENO
INV. DEV. - 27200
- iYR
"''I#lll���a
City .T R009N NWk Utlitlp D.pm
CONCRETE RISER
smcTURE
PERMANENT POOL - 37200
PROVWE STANDARD MANHOLE
STEPS ON INSIDE WALL O
m
RISER AS SHOWN
e*2LF4'
DIA. '0' RING
VERTICAL REINFORCING
ET PIPE O 2336M
BAR! •BOTTOM
OF POND DEV. - 266.50
(SEDIMENT LEVEL)
OP OF f00TNG DiVATON: 28530COMPACTED
PSI REN'
SUBGRADE TAt REINFORCING NG
CONCRETE FOOTING
#OSA
M BMS • r O.C.E.0.OE
WET DETENTION POND OUTLET
STRUCTURE SECTION
NOT TO SCALE
RIP RAP PLAN VIEW
NOT TO SCALE
THEY PUNS HAYS BEEN APPROVED FOR CONSTRUCT
By THE NOWT OF WE FOREST
Engin q D.aart
Dae.
PNdk Walla DWmbnmt
Date
Erwlan k S.6EnmL Cmbd
DRN
FW Pr.rmNan
Dat.
Attaaklny
Dat.
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ore.
City .T R009N NWk Utlitlp D.pm
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4FION 'A
01/20/2017
OIOBYIO "L. The
C.8.0
AFRO JOb(WEnbw:
13-0001-577