20072050 Ver 1_More Info Received_20080414

Permit No:
(to be assigned 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.
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Plans (1" - 50' or larger) of the entire site showing:
- Design at ultimate build-out,
-Off-site drainage (if applicable),
- Delineated drainage basins (include Rational C coefficient per basin),
-Cell dimensions,
-Pretreatment system,
-High flow bypass system,
-Maintenance access,
- Proposed drainage easement and public right of way (ROW),
-Clean out pipe locations,
-Overflow device, and
- Boundaries of drainage easement.
2. Plan details (1" = 30' or larger) for the bioretention cell showing
- Cell dimensions
- Pretreatment system,
-High flow bypass system,
- Maintenance access,
- Recorded drainage easement and public right of way (ROW),
- Design at ultimate build-out,
- Off-site drainage (if applicable),
-Clean out pipe locations,
-Overflow device, and
-Boundaries of drainage easement.
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3. Section view of the bioretention cell (1" = 20' or larger) showing:
-Side slopes, 3:1 or lower
- Underdrain system (if applicable), and
-Bioretention cell layers [ground level and slope, pre-treatment, ponding depth, mulch depth, fill media
depth, washed sand, filter fabric (or choking stone if applicable), #57 stone, underdrains (if applicable),
SHWT level(s), and overflow structure]
4. A soils report that is based upon an actual field investigation, soil borings, and infiltration tests. The
results of the soils report must be verified in the field by DWQ, by completing & submitting the soils
investigation request form. County soil maps are not an acceptable source of soils information. All
elevations shall be in feet mean sea level (fmsl). Results of soils tests of both the planting soil and the in
situ soil must include:
-Soil permeability,
- Soil composition (% sand, % fines, % organic), and
- P-index.
5. A detailed planting plan (1" = 20' or larger) prepared by a qualified individual showing:
- A variety of suitable species,
-Sizes, spacing and locations of plantings,
-Total quantity of each type of plant specified,
- A planting detail,
-The source nursery for the plants, and
- Fertilizer and watering requirements to establish vegetation.
6. A construction sequence that shows how the bioretention cell will be protected from sediment until the
entire drainage area is stabilized.
The supporting calculations (including undertlrain calculations, if applicable).
~"~`- 8. A copy of the signed and notarized operation and maintenance (0&M) agreement.
~ a- 9. A copy of the deed restrictions (if required).
Form SW401-Bioretention-Rev.3 Part III, Page 1 of 1

Permit Number:
(to be provided by DWQ)
+~ OF W A rE9
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N~CaENR Y
STORMWATER MANAGEMENT PERMIT APPLICATION FORM
401 CERTIFICATION APPLICATION FORM
BIORETENTION CELL SUPPLEMENT
This form must be filled out printed and submitted.
The Required Items Checklist (Part Ill) must be printed, filled out and submitted along with all of the required information.
I: P _ OJECT 11= . ATI~N; ~ .. ; , , , - . ,
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Project name 108 Ayoock Street
Contact name Peter Huffey
Phone number 919-313-3747
Date April 10, 2008
Drainage area number WA
IL DESIGN INFORf~AT10
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Site Characteristics
Drainage area 19,166.00 ft
Impervious area 5,184.00 ftz
Percent impervious 27.0%
Design rainfall depth 1.00 inch
Peak Flow Calculations
1-yr, 24-hr runoff depth 2.87 in
1-yr, 24-hr intensity 4.80 inmr
Pre-development 1-yr, 24-hr peak flow 1.12 ft3/sec
Post-development 1-yr, 24-hr peak flow 1.22 ft3/sec
Pre/Post 1-yr, 24-hr peak control 0.10 ft3lsec
Storage Volume: Non-SR Waters
Design volume ft3
Storage Volume: SR Waters
Pre-development 1-yr, 24-hr runoff 424.86 ft3
Post-development 1-yr, 24-hr runoff 467.98 ft3
Minimum volume required 43.12 ft3
Volume provided 70.00 ft O K
Cell Dimensions
Ponding depth of water 12.00 inches OK
Ponding depth of water 1.00 ft
Surface area of the top of the bioretention cell 70.00 ft2 OK
Length: 12.67 ft OK
Width: 6.50 ft Insufficient length
-or- Radius ft
Soils Report Summary
Drawdown time, ponded volume 8.00 hr OK
Drawdown time, to 24 inches below surface 16.00 hr OK
Drawdown time, total: 24.00 hr
In-situ soil;
Soil permeability 0.50 in/hr Insufficient. Increase infiltration rate.
Planting media soil.•
Soil permeability 1.50 in/hr OK
Soil composition
Sand (by weight) 85% OK
Fines (by weight) 10% OK
Organic (by weight) 5% OK
- Total; 100%
Form SW401-Bioretention-Rev.3 Parts I and II. Design Summary, Page 1 of 2

Permit Number:
(to be provided by DWQ)
Phosphorus Index (P-Index)
Basin Elevations
Temporary pool elevation
Planting elevation (top of the mulch)
Bottom of the cell
Planting depth
Depth of mulch
SHWT elevation
Are underdrains being installed?
How many clean out pipes are being installed?
What factor of safety is used for sizing the underdrainsl(See
BMP Manual Section 12.3.6)
Additional distance between the bottom of the planting media and
the bottom of the cell to accotmt for underdrains
Bottom of the cell required
Distance from bottom to SHWT
Type of bioretenflon cell (answer "Y" to only one of the iwo
following questions):
Is this a grassed cell?
Is this a cell with trees/shrubs?
Planting Plan
Number of tree species
Number of shrub species
Number of herbaceous groundcover species
Additional Information
Does volume in excess of the design volume bypass the
bioretention cell?
Dces volume in excess of the design volume flow evenly distributec
through a vegetated filter?
What is the length of the vegetated filter?
Does the design use a level spreader to evenly distribute flow?
Is the BMP located at least 30 feet from surface waters (50 feet if
SA waters)?
Is the BMP located at least 100 feet from water supply wells?
Are the vegetated side slopes equal to or less than 3:1?
Is the BMP located in a recorded drainage easement with a
recorded access easement to a public Right of Way (ROW)?
Inlet velocity (from treatment system)
Is the area surrounding the cell likely to undergo development in
the future?
Are the slopes draining to the bioretention cell greater than 20%?
Is the drainage area permanently stabilized?
Pretreatment Used
(Indicate Type Used with an "X" in the shaded cell)
Gravel and grass
(8'inches gravel followed by 3-5 ft of grass)
Grassed swale
Forebay
(unitless)
496.00 fmsl
495.00 fmsl
OK
492.00 fmsl
3.00 ft
4.00 inches OK
488.00 fmsl OK
y (Y or N)
1 OK
10.00 OK
1ft
491.00 fmsl
3.00 ft OK
n (Y or N)
y (Y or N) OK media depth
1 More species are recommended.
1 More species are recommended.
1 More species are recommended.
y (Y or N) OK
y (Y or N) OK
au n
n (Y or N) Show how flow is evenly distributed.
y (Y or N) OK
y (Y or N) OK
y (Y or N) OK
n (Y or N) Insufficient ROW location.
1.00 ft/sec OK
n (Y or N) OK
n (Y or N) OK
y (Y or N) OK
X
OK
Form SW401-Bioretention-Rev.3 Parts I and II. Design Summary. Page 2 of 2

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Mr. Pete Huffey
H3 Associates, LLC
1101 Dalgraven Drive
Apex, North Carolina 27502
Reference: DWQ Soil Analysis
108 East Aycock
108 East Aycock Street
Raleigh, North Carolina
TEP # 070773.04
Dear Mr. Huffey:
108 East Aycock
H3 Associates, LLC
TEP # 070773.04
April 8, 2008
Page 1 of 5
Tower Engineering Professionals, Inc. (TEP) is pleased to submit this report of the DWQ
Soil Analysis for the referenced project. This report presents a brief confirmation of our
understanding of the project and the soil testing results.
PROJECT DESCRIPTION
TEP understands that a proposed residence and bioretention pond is to be constructed at
the referenced site. The bioretention pond is to encompass an approximate 70 square foot
area on the property. See Drawing C-1.
EXPLORATION
The field exploration included the performance of two hand auger borings in the
proposed bioretention pond section of the property. Continuous samples were obtained to
a depth of 8 feet in both hand auger borings.
3703 Junction Boulevard, Raleigh, NC 27603-5263 O) 919.661.6351 F} 919.661.6350
www.tepq ro u p. n et

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SITE CONDITIONS
SURFACE FEATURES
108 East Aycock
H3 Associates, LLC
TEP # 070773.04
April 8, 2008
Page 2 of 5
The site is located at 108 East Aycock Street in Raleigh, North Carolina. The property
slopes from northwest to southeast. The ground surface is partially barren and partially
covered with un-maintained grass and vegetation.
SUBSURFACE CONDITIONS
Soil
The material consisted primarily of silty sandy clay to the termination of the hand auger
borings. The USCS symbol for the clay is CL or CH.
Subsurface Water
Subsurface water was not encountered at the time of the hand auger borings. Subsurface
water was not observed 24 hours after the completion of the hand auger borings. It
should be noted the subsurface water level will fluctuate during the year, due to seasonal
variations and construction activity in the area.
SOIL TESTING
Soil Permeability Testing
A Flexible Wall Permeability Test was performed in accordance with ASTM D 5084-97
(Permometer Method). Test results are as follows:
Maximum Dry Density 112.9 pcf
Optimum Moisture Content 15.1
Average Permeability 4.0E-08 cm/sec @ 20 degrees C
3703 Junction Boulevard, Raleigh, NC 27603-5263 O) 919.661.6351 F) 919.661.6350
www.tepgroup.net

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Soil Composition
108 East Aycock
H3 Associates, LLC
TEP # 070773.04
April 8, 2008
Page 3 of 5
Soil composition was performed in accordance with ASTM D 421-85 (Dry Preparation of
Soil Samples for Particle Size Analysis) and ASTM D 422-63 (Particle Size Analysis of
Soils). The soil composition is as follows:
Sand 30% +/- 2%
Silt & Clay 68 % +/- 2%
Organics 2% or Less
LIMITATIONS OF REPORT
This report has been prepared in accordance with generally accepted geotechnical
engineering practice for specific application to this project. The conclusions in this report
are based on the applicable standards of our practice in this geographic area at the time
this report was prepared. No other warranty, express or implied, is made.
The analyses and recommendations submitted herein are based, in part, upon the data
obtained from the hand auger exploration. The soil conditions may vary near the hand
auger boring location.
CLOSURE
TEP appreciates the opportunity to work with you by providing the Geotechnical
Engineering Services for this project. Should any questions arise regarding information
presented in this report or when TEP may be of further assistance, please do not hesitate
to contact us.
3703 Junction Boulevard, Raleigh, NC 27603-5263 O) 919.661.6351 F) 919.661.6350
www. tepq rou p. net

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Sincerely,
Tower Engineering Professionals, Inc.
Cory A. Bauer
Geotechnical Division Manager
108 East Aycock
H3 Associates, LLC
TEP # 070773.04
April 8, 2008
Page 4 of 5
'~I~B
3703 Junction Boulevard, Raleigh, NC 27603-5263 O) 919.661.6351 F) 919.661.6350
www. to pq ro u p. n et
' ' J. Russell Hill, P.E.
Senior Engineer

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APPENDIX
108 East Aycock
H3 Associates, LLC
TEP # 070773.04
April 8, 2008
Page 5 of 5
3703 Junction Boulevard, Raleigh, NC 27603-5263 O) 919.661.6351 F) 919.661.6350
www.tepgrou p. net

NOTES:
1. BASED ON PUT PREPARED FOR JAY
HER TILER ON DECEMBER 22. 2006 BY
PENDERGRAPH A 7Ari0R SURVEYING PLLC.
2. HWSE DID NOT EXIST AT THE OF SURVEY.
3. TEMPORARY BENCHMARK ASSUMED TO HAVE
ELEVATION OF 500' ASML ETEVATIONS
SHOWN ARE FOR REFERENCE AND ARE NOT
TO BE TAKEN AS ASML ELEVATIONS
TEMPORARY BENCHMARK
'TEP1'. SEE NOTE 3. -
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PLANS PREPARED FOR:
H3 ASSOCIATES, LLC
1101 DALCRAVEN DRIVE
APEX, NC 27502
(WAKE COUNTY)

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FOOTPRINT
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STORMWATER MANAGEMENT NARRATNE: ~ `;~ ~' Y `y, - \ ~.~
PRE-0Elh70WIFNT tlic rn...~,....,e.. , '. \
THIS SITE IS A VACANT SITE N1TH PRIOR BULT UPON AREA \\.. ~~,~• . % -~ \ \ ~ '~!`` \ \ _ _~
INCLUOINO A DRIVE AND ODAOUSHED RESIDENCE OF 0.047 ,I \~ \ ~ ~ \ "
ACRE OFFSITE B4PERNOUS AREA 5 CALCUU7ED TO BE 0.051 ~ ~ \~ \\ /~*yo_ ,~ ~~ .- -..
ACRE FROM THE PARCELS TO THE NORTHWEST. WE HAVE ~ ~
CAICUUTED A COMPOSITE RUNOFF COFFFICFNT OF 0.44 • \ .-. \ - -_ "
WHEN CAICUUTINO PRE-0EVELOPMENT RUNOFF VAWES \~ ~~ .. ~ _ ~ \ \ _ \ ~~~\
FOR THE ENTIRE DRNNAGE ARE;I
pdcr-DEVY1 oPMFNT d,r DDNDmrwe, \;vs~\~ - - ~ `~ ~ _ ~~
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7HIS SIZE YALL WCLUDE A PROPOSED RESIDENCE AND EXISDNG ~ 1
OPoVEWAY. THE POSE DEVELOPMENT IMPERVIOUS AREA IS ` ~ i ~' E6'
CAICUUTED AS 0.118 ACRE TOTAL IMPERNWS AREA OF ?4f, - ~" `~- =- ~~ ~
THE SUBJECT PARCH IS 33C _ ~~ \\\
BMP NARRATIVE "\\~~\~
STOIb,1WATER WALITY:
STORMWATER WAUn IS ACHEVIED BY A BIORETENTKIN POND. STORMWATER IS
ROUTED TO THE BIORETENTON POND FROM THE PROPOSED ROOF STRUCTURE
NA CUTTER COLLECTION. IT IS ASSUMED THAT THE BIORE:TENTION POND NITROGEN
REl40VAL RATE W 35i. THE POND HAS BEIIJ 97ED FOR THE F1R5T FLUSH WATT]t
ouwn vauME.
PRE-DEWI.OPMENT 2-YR PEAK FLOW ~ 1,12 CFS
PRE-DEVELOPMENT 10-YR PEAK FLOW ~ 1.40 CFS
POST-DEVELOPMEM 2-YR PEAK FLOW (W1TH011T DETENTION)- 1:22 CFS
POST-DEVELOPMENT 10-18 PEAK FLOW (MATHWT DETENTION) 1.52 CFS
SITE PLAN
SCALE: J(a i'-0"
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LOCATION MAP
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DB: fsssa I'4 EIE!
PIN: I'I04774YOE-000
EOMD: &-f0
STORMWATER BMP LEGEND:
O7 BIORETENTION - 70 90. FT.
(173 54 FT. QICROACHNG 20NE 2)
SEE DETAILS, ANO CALCUU710N ON SHEET C-2.
O2 NEW IMPERVOUS AREA -666 SO. FT.
(666 Sfl. FT. ENCRDACHWC 20NE 2)
INDEX OF SHEETS
NO. SHEET TITLE REV DATE
C-/ STORMWAIER SITE PLAN 2 03-10-06
C-2 BIORE7ENTION DETAILS 8 CALCUUTONS 2 03-10-OB
C-3 BNP MAINTENANCE k WSPEC710N NOTES 2 03-10-06
C-4 RIPARIAN BUFFER MITGATON PLAN 2 03-10-OB
108 EAST AYCOCK
108 EAST AYCOCX STREET
RALEIGH, NC 27608
(WAKE COUNTI~
PLANS PREPAARED BY:
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3703JUNCTIONBOULEVARD
RALEIGH, NC 27605263
OFFICE: [phone]
FAX (919)661-fi350
SEAL•
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2 03-10-OD MTIGATION %PN
1 02-07.OD STOIWIWARIC RAN
O 10-04-07 PRLUMINARY SKETCI
iEV DATE ISSUED FOR:
DRANK BY: FrB CHECKED BY:
SKEET TITLE:
STORMWATER
SITE PLAN
SHEET NUMBER: REVISION:

Permit Number:
(to be provzded by DWQ)
Drainage Area Number:
Bioretention Operation and Maintenance Agreement
I will keep a maintenance record on this BMP. This maintenance record will be kept in a
log in a known set location. Any deficient BMP elements noted in the inspection will be
corrected, repaired or replaced immediately. These deficiencies can affect the integrity
of structures, safety of the public, and the removal efficiency of the BMP.
Important operation and maintenance procedures:
- Immediately after the bioretention cell is established, the plants will be watered
twice weekly if needed until the plants become established (commonly six
weeks).
- Snow, mulch or any other material will NEVER be piled on the surface of the
bioretention cell.
- Heavy equipment will NEVER be driven over the bioretention cell.
- Special care will be taken to prevent sediment from entering the bioretention cell.
- Once a year, a soil test of the soil media will be conducted.
After the bioretention cell is established, I will inspect it once a month and within 24
hours after every storm event greater than 1.0 inches (or 1.5 inches if in a Coastal
County). Records of operation and maintenance will be kept in a known set location
and will be available upon request.
Inspection activities shall be performed as follows. Any problems that are found shall
be repaired immediately.
BMP element: Potential roblems: How 1 will remediate the roblem:
The entire BMP Trash/debris is resent. Remove the trash/debris.
The perimeter of the Areas of bare soil and/or Regrade the soil if necessary to
bioretention cell erosive gullies have formed. remove the gully, and then plant a
ground cover and water until it is
established. Provide lime and a
one-time fertilizer a lication.
The inlet device: pipe, The pipe is clogged (if Unclog the pipe. Dispose of the
stone verge or Swale a livable . sediment off-site.
The pipe is cracked or Replace the pipe.
otherwise damaged (if
a livable .
Erosion is occurring in the Regrade the Swale if necessary to
Swale (if applicable). smooth it over and provide erosion
control devices such as reinforced
turf matting or riprap to avoid
future roblems with erosion.
Stone verge is clogged or Remove sediment and clogged
covered in sediment (if stone and replace with clean stone.
a livable .
Form SW401-Bioretention O&M-Rev.3 Page 1 of 4

BMP element: Potential roblems: How I will remediate the roblem:
The pretreatment azea Flow is bypassing Regrade if necessary to route all
pretreatment area and/or flow to the pretreatment area.
llies have formed. Restabilize the area after adin .
Sediment has accumulated to Search for the source of the
a depth greater than three sediment and remedy the problem if
inches. possible. Remove the sediment and
restabilize the retreatment area.
Erosion has occurred. Provide additional erosion
protection such as reinforced turf
matting or riprap if needed to
revent future erosion roblems.
Weeds are present. Remove the weeds, preferably by
hand.
The bioretention cell: Best professional practices Prune according to best professional
vegetation show that pruning is needed practices.
to maintain optimal plant
health.
Plants are dead, diseased or Determine the source of the
dying. problem: soils, hydrology, disease,
etc. Remedy the problem and
replace plants. Provide aone-time
fertilizer application to establish the
ground cover if a soil test indicates
it is necessa
Tree stakes/wires are present Remove tree stake/wires (which
six months after lantin can kill the tree if not removed .
The bioretention cell: Mulch is breaking down or Spot mulch if there are only random
soils and mulch has floated away. void areas. Replace whole mulch
layer if necessary. Remove the
remaining much and replace with
triple shredded hard wood mulch at
a maximum de th of three inches.
Soils and/ or mulch are Determine the extent of the clogging
clogged with sediment. -remove and replace either just the
top layers or the entire media as
needed. Dispose of the spoil in an
appropriate off-site location. Use
triple shredded hard wood mulch at
a maximum depth of three inches.
Search for the source of the
sediment and remedy the problem if
ossible.
An annual soil test shows that Dolomitic lime shall be applied as
pH has dropped or heavy recommended per the soil test and
metals have accumulated in toxic soils shall be removed,
the soil media. disposed of properly and replaced
with new lantin media.
Form SW401-Bioretention O&M-Rev.3 Page 2 of 4

BMP element: Potential roblems: How I will remediate the roblem:
The underdrain system Clogging has occurred. Wash out the underdrain system.
if a licable
The drop inlet Clogging has occurred. Clean out the drop inlet. Dispose of
the sediment off-site.
The dro inlet is dama ed Re air or re lace the dro inlet.
The receiving water Erosion or other signs of Contact the NC Division of Water
damage have occurred at the Quality 401 Oversight Unit at 919-
outlet. 733-1786.
Form SW401-Bioretention O&M-Rev.3 Page 3 of 4

Permit Number:
(to be provided by DWQ)
I acknowledge and agree by my signature below that I am responsible for the
performance of the maintenance procedures listed above. I agree to notify DWQ of any
problems with the system or prior to any changes to the system or responsible party.
Project name: /Ot3 s~-sr ~17ccxk
BMP drainage area number:
Print name: Jr4 Y G. f~c~LS-~.r
Title: /`~~-r.~GfvC
Address: i3~G OG~rS~ /F ~i~rf, NC- e27~~y
Phone: 919- 8YY- 60 89'
Signature: ~- ~ ' ~-
Date:
Note: The legally responsible party should not be a homeowners association unless more than 50% of
the lots have been sold and a resident of the subdivision has been named the president.
1, S ~~~4~~ ~- • ~a ~~ , a Notary Public for the State of
s~~ G. +(e~ ~ zfc.
do hereby certify that
personally appeared before me this I ti'''`'
day of ~-,,; I v~~ ,and acknowledge the due execution of the
forgoing bioretention maintenance requirements. Witness my hand and official seal,
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My commission expires 12 • Z~ • 2 v i ~
Form SW401-Bioretention I&M-Rev. 2 Page 4 of 4

NOTES:
1. BASED ON PLAT PREPARED FOR JAY
HERTZLER ON DECEMBER 22, 2006 BY
PENDERGRAPH & TAYLOR SURVEYING PLLC.
TEMPORARY BENCHMARK D ~~~~ f7~ D~
\VVI
2. HOUSE DID NOT EXIST AT T1ME OF SURVEY. "TEP1". SEE NOTE 3.
3. TEMPORARY BENCHMARK ASSUMED TO HAVE ~ R 1 4 2008 >~
ELEVATION OF 500' ASML ELEVATIONS V~
V
L a
' o~
SHOWN ARE FOR REFERENCE AND ARE NOT
TO BE TAKEN AS A ~
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DEN WATEk OJA~'~ RANGH ~°
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SML ELEVATIONS. a
5
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.
A STr,~I~NA
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PROPOSED 10' WIDE ,( P \~ _

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ORIGINAL BUILDING
PUBLIC RIGHT OF WAY ~(~
EASEMENT TO BE _~~ _ ~ FOOTPRINT
RECORDED ~j ,, ~ - ,~
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EXISTING CONCRETE ~
DRIVEWAY ~ ~ ~ 2
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STORMWATER MANAGEMENT NARRATIVE; -- - ~
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~ _ ~~ ~
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PRE-DEVELOPMENT SITE CONDITION _
\
~BkI~~NG __ ~ ~
` ~`
THIS SITE IS A VACANT SITE WITH PRIOR BUILT UPON AREA \ UFFeR_L/NE"~ _- __ _
INCLUDING A DRIVE AND DEMOLISHED RESIDENCE OF 0.047 \ ~\ ~_ _
ACRE. OFFSITE IMPERVIOUS AREA IS CALCULATED TO BE 0.051 \
ACRE FROM THE PARCELS TO THE NORTHWEST. WE HAVE ~i \
CALCULATED A COMPOSITE RUNOFF COEFFCIENT OF 0.44 •`'0. ~ ~A9p` . - \ ~~ ~ -
WHEN CALCULATING PRE-DEVELOPMENT RUNOFF VALUES ~
FOR THE ENTIRE DRAINAGE AREA. 1 ~
-- ~
_- _. - ~
POST-D OPMENT I ~ONDI110N - -
THIS SITE W1LL INCLUDE A PROPOSED RESIDENCE AND EXISTING - "'d '
~ _ --
DRIVEWAY. THE POST DEVELOPMENT IMPERVIOUS AREA IS H6 .~ - 1
CALCULATED AS 0.119 ACRE. TOTAL IMPERVOUS AREA OF OS• \ -
THE SUBJECT PARCEL IS 33%. WE HAVE CALCULATED A COMPOSITE 28,4 °{y - -~ ` ~ ~ ~ ~
RUNOFF COEFFICIENT OF 0.48 WHEN CALCULATING PRE-DEVELOPMENT ,~
RUNOFF VALUES FOR THE ENTIRE DRAINAGE AREA.
BMP NARRATIVE: ~
STORMWATER QUALITY:
STORMWATER QUALITY IS ACHEVIED BY A BIORETENTION POND. STORMWATER IS
ROUTED TO THE BIORETENTION POND FROM THE PROPOSED ROOF STRUCTURE
VIA GUTTER COLLECTION. IT IS ASSUMED THAT THE BIORETENTION POND NITROGEN
REMOVAL RATE IS 359a THE POND HAS BEEN SIZED FOR THE FIRST FLUSH WATER
QUALTY VOLUME.
PRE-DEVELOPMENT 2-YR PEAK FLOW = 1.12 CFS
PRE-DEVELOPMENT 10-YR PEAK FLOW = 1.40 CFS
POST-DEVELOPMENT 2-YR PEAK FLOW (WITHOUT DETEN110N)= 1.22 CFS
POST-DEVELOPMENT 10-YR PEAK FLOW (WITHOUT DETEN110N)= 1.52 CFS
SITE PLAN
SCALE: Y~fi' = 1'-p"
13.58'
STORMWATER BMP LEGEND:
01 BIORETEN110N - 70 SQ. FT.
(173 SQ. FT. ENCROACHING ZONE 2)
SEE DETAILS, AND CALCULAl10N ON SHEET C-2.
02 NEW IMPERVIOUS AREA - 666 SQ. FT.
(666 SQ. FT. ENCROACHING ZONE 2)
03 FLOW SPLITTER. FLOW FROM GUTTER TO FLOW TO
THIS POINT. WEIR TO MATCH BIORElENT10N PONDING
ELEVATION. 10YR Q < FOR ROOFTOP DISCHARGE
~ ~ ~ ' d°o,5 c7
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LOCATION MAP N
~~
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rn;
DRAINAGE BASIN ~ /~
EXISTING BUILDING / I
EXISTING
o~~~
./
SCALE: 1" = 100'
DRAINAGE PLAN
INDEX OF SHEETS
N0. SHEET TITLE REV DATE
C-1 STORMWATER SITE PLAN 4 04-10-08
C-2 BIORETENTION DETAILS & CALCULATIONS 4 04-10-DS
C-3 BMP MAINTENANCE & INSPECTION NOTES 3 03-18-08
C-4 RIPARIAN BUFFER MITIGA110N PLAN 4 04-10-OS
® PVC UNDERDRAINS. SEE DETAIL, SHEET C-2.
PLANS PREPARED FOR:
H3 ASSOCIATES, LI,C
1101 DALGRAVEN DRIVE
APEX, NC 27502
(WAKE COUNTY)
I PROJECT INFORMATION:
108 EAST AYCOCK
108 EAST AYCOCK STREET
RALEIGH, NC 27608
(WAKE COUNTY)
PLANS PREPARED BY:
r~
d~
is1
~~
w
'~
TOWER ENGINEERING PROFESSIONALS
3103 JUNCTION BOULEVARD
RALEIGH, NC 27603.5263
OFFICE: [phone]
FAX: [phone]
SEAL:
~N
B,
10, 2008
4 04-10-08 GEOTECIINICAL REPORT
3 03-18-08 NC DWQ COMMENTS
2 03- I 0-08 MITIGATION PLAN
I 02-07-08 STORMWATER PLAN
REV DATE ISSUED FOR:
DRAWN BY: STE CHECKED BY: JBG
SHEET T1TLE:
STORMWATER
SITE PLAN
SHEET NUMBER: REVISION:
C-1 a
TEP #: 070773

DRAINAGE COMPUTATIONS:
TOTAL LOT SIZE: 0.21 ACRES
TOTAL DRAINAGE AREA: 0.44 ACRES
(INCLUDES AREA FROM ADJACENT
PARCEL TO THE NORTHEAST)
RATIONAL METHOD: Q =CIA
WHERE:
Q =PEAK FLOW FROM DRAINAGE AREA (CFS)
C =RUNOFF COEFFlCIENT
(0.30 FOR IMPERVIOUS, 0.95 FOR IMPERVIOUS)
I =RAINFALL INTENSITY FOR TIME TO PEAK
(Tc = 5 MIN USED)
(5.76 IN/HR - 2 YR STORM)
(7.22 IN/HR - 10 YR STORM)
A =DRAINAGE AREA (ACRES)
PRE-DEVELOPMENT (2-YR STORM):
Q2 =CIA
COMPOSITE, Cc:
IMPERVIOUS AREA ONSITE 0.047 ACRES
IMPERVIOUS AREA OFFSITE 0.051 ACRES
Cc =[(0.95)(0.098) +(0.30)(0.342)] / 0.44
Cc = 0.44
Q2 = (0.44)(5.76)(0.44)
Q2=1.12 CFS
POST-DEVELOPMENT (2-YR STORM):
Q2 =CIA
COMPOSITE, Cc:
IMPERVIOUS AREA ONSITE 0.047 ACRES
IMPERVIOUS AREA OFFSITE 0.051 ACRES
Cc =[(0.95)(0.119) +(0.30)(0.321)] / 0.44
cc = 0.46
Q2 = (0.48)(5.7s)(o.44)
Q2 = 1.22 CFS
WATER QUALITY VOLUME:
PRE-DEVELOPMENT:
WQv = (P)(Rv)(A)/12
WHERE;
P = 1 IN OF RAINFALL
Rv = 0.05 + 0.009(1)
I =PERCENT IMPERVIOUS COVER
A =TOTAL LOT SIZE IN ACRES
Rv = 0.05 + 0.009(23) = 0.257
wQv =(1)(0.257)(0.21) / 12
WQv = 0,00450 ACRE-FT = 196 CF
POST-DEVELOPMENT:
WQv = (P)(Rv)(A)/12
WHERE:
P = 1 IN OF RAINFALL
Rv = 0.05 + 0.009(1)
I =PERCENT IMPERVIOUS COVER
A =TOTAL LOT SIZE IN ACRES
Rv = 0.05 + 0.009(33) = 0.347
WQv =(1)(0.347)(0.21) / 12
WQv = 0.00607 ACRE-FT = 265 CF
POST WQv -PRE WQv,
265 - 196 = 69 CF -> 70 CF
STORMWATER CALCULATIONS
PRE-DEVELOPMENT (10-YR STORM): POST-DEVELOPMENT (10-YR STORM):
Q2 =CIA Q2 =CIA
COMPOSITE, Cc: COMPOSITE, Cc:
IMPERVIOUS AREA ONSITE 0.047 ACRES IMPERVIOUS AREA ONSITE 0.047 ACRES
IMPERVIOUS AREA OFFSITE 0.051 ACRES IMPERVIOUS AREA OFFSITE 0.051 ACRES
Cc =[(0.95)(0.098) +(0.30)(0.342)] / 0.44 Cc =[(0.95)(0.119) +(0.30)(0.321)] / 0.44
Cc = 0.44 Cc = 0,48
Q2 =(0.44)(7.22)(0.44) Q2 =(0.48)(7.22)(0.44)
Q2 = 1.40 CFS Q2 = 1.52 CFS
PLANTING SCHEDULE
ITEM QTY. BOTANICAL COMMON HEIGHT @ HEIGHT @ SPACING REMARKS
NAME NAME PLANTING MATURITY
TREES
O 1 (Ceras canadensis) EASTERN
REDBUD 4'-0" (MIN) 20'-0" (MIN) VARIES SHOWN AS
SHRUB
O 1 (Myrica cenfera) WAX MYRTLE 1'-6° (MIN) 6'-0° (MIN) VARIES SHOWN AS 0
GROUNDCOVERB~GRASSES
O 1 (Amsoma hubnchtu) NARROW LEAF _ _ _ _
BLUE STAR
N(1TF"
THE BIORETENTION CELL SHALL BE PROTECTED WITH A
SILT FENCE UNTIL THE SITE IS STABILIZED.
GRASS STRIP, WIDTH VARIES
(3:1 MAX SLOPE)
8" OF GRAVEL TO
SURROUND POND ~
1 MAX SLOPE
SOIL MIXTURE -CRITICAL
INFILTRATION RATE OF 1"-2"/HR
85% WASHED SAND
10% SILT & CLAY
5% ORGANIC -PEAT MOSS
3' ENGINEERED SOIL MIXTURE
AS SPECIFIED
GEOTEXTILE FABRIC OVER
SAND & STONE
(2) 4"0 SCH 40 PVC UNDERDRAINS W/
(4) ROWS OF ~"0 PERFORATIONS AROUND
UNDERDRAIN. PERFORATION TO BE SPACED
AT 6" CENTERS LONGITUDINALLY. UNDERDRAINS
TO BE SET AT A 0.5% SLOPE. SEE BIORETENTION
NOTES, FOR DETAILS.
TYPICAL BIORETENTION SECTION
SCALE: )'~" = 1'-0"

PLANTINGS SUITABLE FOR NC BMP SITES. SEE
PLANTING SCHEDULE, THIS SHEET (LISTED IN
TABLE 12-2, NC DWQ STORMWATER BMP
MANUAL -JULY 2007)
4" MIN SHREDDED HARDWOOD MULCH
12" PONDING DEPTH
8 HOUR DRAW DOWN
1-2" MEDIA PERMEABILITY
AT 1.5 IN/HR INFLTRATION RATE:
Q = 0.00243 CF/HR
S = 0.5%
n = .011
THEREFORE:
D< 4in USE 4 in PVC
MINIMUM OF TWO UNDERDRAIN PIPES
REQUIRED. ONE CLEANOUT PER PIPE
WITHIN BOUNDS OF BIORETENTION
2" WASHED SAND
2" CHOKING STONE (#8 OR #89)
8" WASHED #57 STONE
~C~C~p~~
APR 1 4 2008
DENR -WATER UUAUTY
-- ...
PLANS PREPARED FOR:
K3 ASSOCIATES, LLC
1101 DALGRAVEN DRIVE
APEX, NC 27502
(WAKE COUNTY)
PROJECT INFORMATION:
108 EAST AYCOCK
108 EAST AYCOCK STREET
RALEIGH, NC 27608
(WAKE COUNTY)
PLANS PREPARED BY: I
d
~ I
~~
TOWER ENGINEERING PROFESSIONALS
3703 JUNCTION BOULEVARD
RALEIGH, NC 27603.5263
OFFICE; [phone]
FAX: [phone]
4 04-10-08 GEOTECNNICALREPORT
3 03- 18-OS NC DWQ COMMENTS
2 03-10-08 MITIGATION PLAN
I 02-07-08 STORMWATER PLAN
REV DATE ISSUED FOR:
DRAWN BY: KPB CHECKED BY: JBG
SHEET T1TLE:
BIORETENTION
DETAILS &
CALCULATIONS
SHEET NUMBER: REVISION:
C-2 a
TEP #: 070773

~'
/ ~~
i
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~~
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/1 /V
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FLOW
SPUTTER

BIORETENTION PLAN
SCALE: ~6" = 1'-D"
~'~
r,
DO NOT COMPACT SOIL MIX OR
USE HEAVY EQUIPMENT TO PLACE
~ SOIL MIXTURE
t=

MAINTENANCE ITEMS:
WATERING:
PLANTS SHOULD BE SELECTED TO BE TOLERANT OF
THE BIORETENnON FACILITES PARTICULAR
CONDInONS. WATERING SHOULD NOT BE REQUIRED
AFTER ESTABLISHMENT (2 TO 3 YEARS). HOWEVER,
WATERING MAY BE REQUIRED DURING PROLONGED
DRY PERIODS AFTER PLANTS ARE ESTABLISHED.
EROSION CONTROL:
INSPECT FLOW ENTRANCES, PONDING AREA, AND
SURFACE OVERFLOW AREAS PERIODICALLY. REPLACE
SOIL, PLANT MATERIAL, AND/OR MULCH IN AREAS
WHERE EROSION HAS OCCURRED. EROSION PROBLEMS
SHOULD NOT OCCUR WITH PROPER DESIGN EXCEPT
DURING EXTREME WEATHER EVENTS. IF EROSION
PROBLEMS DO OCCUR, THE FOLLOWING ISSUES
SHOULD BE RE-ASSESSED: FLOW VOLUMES FROM THE
CONTRIBUTING DRAINAGE AREA AND BIORETENnON
SIZE; FLOW VELOCITIES AND GRADIENTS WITHIN THE
BIORETENnON FACILITY; FLOW DISSIPAnON AND
EROSION PROTECnON METHODS IN THE PRETREATMENT
AND INFLOW AREAS. IF SEDIMENT IS DEPOSITED IN THE
BIORETENTION FACILITY, IMMEDIATELY DETERMINE THE
SOURCE, REMOVE EXCESS DEPOSITS, AND CORRECT
THE PROBLEM.
PLANT MATERIAL•
DEPENDING ON PLANTS SELECTED AND AESTHETIC
REQUIREMENTS, OCCASIONAL PRUNING AND REMOVAL
OF DEAD PLANT MATERIAL MAY BE NECESSARY.
REPLACE ALL DEAD PLANTS. HOWEVER, IF SPECIFlC
PLANTS CONSISTENTLY HAVE A HIGH MORTALITY
RATE, ASSESS THE CAUSE AND REPLACE WITH
APPROPRIATE SPECIES. PERIODIC WEEDING IS
NECESSARY UN11L GROUND COVER PLANTS ARE
ESTABLISHED. WEEDING SHOULD BECOME LESS
FREQUENT IF AN APPROPRIATE PLANT DENSITY HAS
BEEN USED.
NUTRIENTS AND PESTICIDES;
THE SOIL MEDIA AND PLANT MATERIAL SHOULD HAVE
BEEN SEIECTED FOR OPTIMUM FERnLITY, PLANT
ESTABLISHMENT, AND GROWiH WITHIN THE
PARTICULAR CONDInONS OF EACH BIORETENnON
FAgUTY. NUTRIENT AND PESTICIDE INPUTS SHOULD
NOT BE REQUIRED AND WILL DEGRADE THE
POLLUTANT PROCESSING CAPABILITY OF THE
BIORETENnON FACILITY, AS WELL AS CONTRIBUTE TO
ADDITIONAL POLLUTANT LOADING TO RECEIVING
WATERS, BY DESIGN, BIORETENTION FACILITIES ARE
TYPICALLY SPECIFlED IN WATERSHEDS WHAT
PHOSPHORUS AND NITROGEN LEVELS ARE OFTEN
ELEVATED. THEREFORE, THESE SHOULD NOT BE
LIMITING NUTRIENTS WITH REGARD TO PLANT HEALTH.
IF IN QUESTION, HAVE THE SOIL ANALYZED FOR
FERnuTY.
MULCH:
REPLACE MULCH ANNUALLY IN BIORETENnON
FACILITIES WHERE HEAVY METAL DEPOSInON IS LIKELY
(E.G., DRAINAGE AREAS THAT INCLUDE COMMERCIAL/
INDUSTRIAL US, PARKING LOTS, OR ROADS). IN
RESIDENTIAL OR OTHER SETTINGS WHERE METAL
DEPOSInON IS NOT A CONCERN, REPLACE OR ADD
MULCH AS NEEDED TO MAINTAIN A 2 TO 4 INCH
DEPTH AT LEAST ONCE EVERY TWO YEARS.
SOIL MEDIA:
SOIL MIXES OF BIORETENnON FACILITIES ARE
DESIGNED TO MAINTAIN LONG-TERM FERTILITY AND
POLLUTANT PROCESSING CAPABILITY. ESTIMATES
FROM METAL ATTENUAnON RESEARCH INDICATES
THAT METAL ACCUMULAnON SHOULD NOT PRESENT
A TOXICITY CONCERN FORA LEAST 20 YEARS IN
BIORETENTION FACIUTYS (USE 2000). FURTHER,
REPLACING MULCH WHERE HEAVY METAL
DEPOSInON IS LIKELY PROVIDES AN ADDInONAL
FACTOR OF SAFETY FOR PROLONGED
BIORETENnON PERFORMANCE. IF IN QUESnON,
HAVE SOIL ANALYZED FOR FERnUTY AND
POLLUTANT LEVELS.
INSPECTION ITEMS:
IMPORTANT INSPECnON AND MAINTENANCE PROCEDURES:
- IMMEDIATELY AFTER THE BIORETENnON CELL IS ESTABLISHED, THE PLANTS
WILL BE WATERED TWICE WEEKLY IF NEEDED UNT1L THE PLANTS BECOME
ESTABLISHED (COMMONLY SIX WEEKS)
- SNOW, MULCH OR ANY OTHER MATERIAL WILL NFVFR BE PILED ON THE
SURFACE OF THE BIORETENnON CELL.
- HEAVY EQUIPMENT WILL dEYEB BE DRIVEN OVER THE BIORETENnON CELL.
- SPECIAL CARE WILL BE TAKEN TO PREVENT SEDIMENT FROM ENTERING
THE BIORETENnON CELL.
- ONCE A YEAR, A SOIL TEST OF THE SOIL MEDIA WILL BE CONDUCTED.
AFTER THE BIORETENnON CELL IS ESTABUSHED,IT IS THE OWNERS RESPONSIBILITY TO
INSPECT IT ONCE A MONTH AND WITHIN 24 HOURS AFTER EVERY STORM EVENT GREATER
THAT 1.0 INCHES. RECORDS OF INSPECnON WAND MAINTENANCE WILL BE KEPT IN A
KNOWN SET LOCATION AND WILL BE AVAILABLE UPON REQUEST.
INSPECnON ACTIVITIES SHALL BE PERFORMED ACCORDING TO THE NC DWQ STORMWATER
BMP MANUAL -JULY, TABLE 12-2. ANY PROBLEMS THAT ARE FOUND SHALL BE REPAIRED
IMMEDIATELY.
NOTES
~~~~oe~~
APR 1 4 2008
i)EPaFc -'vVATER DUALITY
WE°'ANOS sNi)STORpryyATERBRANCH
PLANS PREPARED FOR:
H3 ASSOCIATES, LLC
1101 DALGRAVEN DRIVE
APEX, NC 27502
(WAKE COUNTY)

PROJECTINFORMAnON:
108 EAST AYCOCK
108 EAST AYCOCK STREET
RALEIGH, NC 27608
(WAKE COUNTY)

PLANS PREPARED BY:
i`
,'i
I
~ II
L.
..
~
.
TOWER ENGINEERING PROFESSIONALS
3703 JUNCTION BOULEVARD
RALEIGH, NC 21603.5263
OFFICE: (919) 661351
FAX: [phone]

SEAL:
,,~g1111111
,
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9~tarck 18, 2008

3 03- 18-08 NC DWQ COMMENTS
2 03-10-08 MITIGATION PIAN
I 02-07-08 STORMWATER PLAN
0 I O-Ok-07 PRELIMINARY SKE7G11
REV DATE ISSUED FOR:

DRAWN BY: KPB CHECKED BY: JBG
SHEET nTLE:
BMP MAINTENANCE &
INSPECTION NOTES
SHEET NUMBER: REVISION:
3
C -3
TEP #: 070773

MITIGATION LEGEND:
O BIORETENTION AREA
173 SQ. FT. ENCROACHING ZONE 2
02 NEW IMPERVIOUS AREA .(
666 SQ. FT. ENCROACHING ZONE 2 ~`
~
~j
TOTAL ENCROACHING AREA = 839 SQ. FT. '``-
o
~~
:
k0
Q i0
~
y
9
TOTAL MITIGATION AREA REQUIRED G
~
1 O8
10
03 839 SQ. FT. x 1.5 = 1258.5 SQ. FT. O
~ <' ~
~
MITIGATION AREA: 1260 SQ. FT. '~ ~ '~ ~~ .
~
-- \ -_
1260/43560 = 0.0289
0.0289 * 320 = 9.26 TREES
10 TREES NEEDED IN MITIGATION AREA
MITIGATION NOTES:
ORIGINAL BUILDING
FOOTPRINT
Z=
Dn
o~
Wo
„ ~ _~
\ ° - ~" ,
~P ~ ~ °
~ ~ _,
EXISTING CONCRETE
~' ~ - a . ~ 2 ~' L ~-< ~ '
DRIVEWAY ~ `° ~~ ~ ~ ~.~ ~' ~p
~^ \
/ ~ ~ ~ `\~~
E ~ ~-
N
SA~. ~ ~' ~ ~ ~ ~ ~ ~~
O~
- ELIMINATE AREAS WHERE CHANNEUZED FLOW HAS DEVELOPED .A~ _
\ ~
~ ~
- CONTROL SOD-FORMING GRASSES (LE. FESCUE, KENTUCKY) ~ ~ , ~
`~~,
~ -
-CONTROL INVASIVE, EXOTIC PLANTS. ~ ~ ° ~ ~
'~~
~~
- PESTICIDE USE TO BE APPROVED BY NCDWQ TO ENSURE
~ / -
~
~~
COMPLIANCE WITH NEUSE BUFFER RULES - O
~

~ ~ ~~ ~~~
~
VEGETATION PLAN: ~ ° _
~ _
_ ~~~
~
~
THE EIGHT PROPOSED UNDERSTORY TREES SHALL CONSIST OF TWO 4
\ ~~~_ _ ~
r
~
~
SPECIES OF NATIVE TREES FOUND IN THE LATEST EDITION OF THE NCDWQ
,
\ - -
~~
~
MINIMUMAOFR2
5 S BH AT T1ME OF PLANTING
CENTIPED SAND ZOYSIA \ ~
~
eGFF~
.
.
GRASSES TO BE USED FOR GROUND COVER.
~~ ~ S
;
~
N
'~ \;` 5 F\~3n. - -
FERTILIZATION PLAN: ~p ~ - \ .5 ; F
o
SITE FERTILIZATION SHALL CONSIST OF A ~l T1ME APPLICATION AT THE
T1ME OF PLANTING TO ESTABLISH VEGETATION. LANDSCAPE MANAGEMENT
PERSONNEL SHOULD BE TRAINED TO DETERMINE THE LEVEL OF CHEMICAL
INPUT ACCORDINGLY AND MANAGE TO RECOGNIZE PLANT HEALTH PROBLEMS.
LAND DISTURBANCE SHALL BE KEPT TO A MINIMUM. CLEARING SHOULD BE
BY IF POSSIBLE.
THE RESTORED AREA SHALL BE PLACED IN A PERMANENT CONSERVATION
EASEMENT SO THE MITIGATION AREA IS NOT REMOVED OR REDUCED.
-- ~ _
- \~,~
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13.
PLANTING SCHEDULE
ITEM QTY. BOTANICAL COMMON HEIGHT @ HEIGHT @ SPACING REMARKS
NAME NAME PLANTING MATURITY
04 4 (Cornos Honda) DOGWOOD 4'-0" 20'-O" (MIN) 10'-O° SHOWN AS
4 (Magnolia virgimana) SWEETBAY 4~_0° 20'-O" (MIN) 10'-O° SHOWN AS i"~
MAGNOLIA
SITE PLAN
SCALE: lis" = 1'-0"

Jtiv~~ - WHi tti GIUAUTY
WETLANDS AND STORMWAIER BRANCH
N/F
H3 dSSOC., LLC
DB: 12363 PG: 2429
PIN: 1704774702-000
ZONED: R-f0

EXISTING OAK (TYP OF 2)
(6)-PROPOSED UNDERSTORY TREES
PER VEGETATION PLAN. SEE
DESCRIPTION, THIS SHEET.
Q~c~~oe~~
APR 1 4 2008
DENR - WATER QUA{JTY
WETLANDS AND STORMWATER BRANCH
PLANS PREPARED FOR:
H3 ASSOCIATES, LLC
1101 DALGRAVEN DRIVE
APEX, NC 27502
(WAKE COUNTY)

PROJECT INFORMATION:
108 EAST AYCOCK
108 EAST AYCOCK STREET
RALEIGH, NC 27608
(WAKE COUNTY)

PLANS PREPARED BY:
i
TOWER ENGINEERING PROFESSIONALS
3703 JUNCTION BOULEVARD
RALEIGH, NC 27603.5263
OFFICE: [phone]
FAX: [phone]

SEAL:
~/~tlllllt~
C

2
R~
~p

•
• $ •
•
o r ~
~• '•aNG ~ .•~~y :~
a
....
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Ap,'zllo, 2008
4 04-10-08 GEOTECIINICAL REPORT
3 03-18-08 NC DWO COMMENTS
2 03-10-08 MITIGATION PLAN
I 02-07-08 STORMWATER PLAN
REV DATE ISSUED FOR:

DRAWN BY: 5TF CHECKED BY: JBG
SHEET TITLE:
BUFFER MITIGATION
PLAN
SHEET NUMBER: REVISION:
C-4 4
TEP ~: 070773