20080554 Ver 1_More Info Received_20080516

N
:.W E.? BURDETTE LAND CONSULTING, INC.
10212 Creedmoor Road - Raleigh, North Carolina 27615
Telephone [phone] - Fax [phone]
S
May 16, 2008
Mr. Ian McMillan
NC Division of Water Quality
Central Office
401 Oversight/Express Review Permitting Unit
2321 Crabtree Boulevard, Suite 250
Raleigh, North Carolina 27604
RE: Request for More Information Response
The Preserve, Johnston County, NC
DWQ Project #: 08-0554
BLC Project #: 7156
Dear Mr. McMillan:
We received NC Division of Water Quality's (NCDWQ) request for more information on the
subject project dated April 11, 2008 and met with Annette Lucas on April 17, 2008 to discuss the
diffuse flow provisions requested in your agency's letter. Three bioretention areas have been
added to the project to achieve diffuse flow. Two paper copies of the Stormwater Management
Plan (SMP) and one CD with a digital copy are enclosed. A section view of the bioretention
areas, supplemental forms, drainage calculations, inspection and maintenance agreements, and a
soils report are attached to support the SMP.
Please feel free to contact Keith Roberts, PE of Development Consulting Services directly at
[phone] if you have any questions about the diffuse flow provisions provided.
Sincerely,
Burdette Land Consulting, Inc.
e?el. &?
Jennif r A. Burdette
Environmental Specialist
c: Freddie Stancil - Stancil & Longo, LLC (letter only) P?lA, ?
VENN'& " UAul?
(ANDSAND S-rG ?;,WArEl S
CH
BIORETENTION CELL CALCULATIONS
THE PRESERVE
JOHNSTON COUNTY, NORTH CAROLINA
JOHNSTON COUNTY
PO BOX 2263
SMITHFIELD, NC 27577
SUBMITTED BY: DEVELOPMENT CONSULTING SERVICES, INC.
1401 AVERSBORO ROAD, SUITE 206
GARNER, NC 27529
[phone]
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BIORETENTION DETAIL
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BIORETENTION POND DETAIL #1
SCALE: N. T.S.
ELEV.
BIORETENTION DETAIL
NTB
BIORETEN TION POND DETAIL #2
SCALE: N. T. S.
ELEV.
BI0%1'E (nON DETAIL
NT8
BIORETENTION POND DETAIL #3
SCALE: N. T. S.
Permit Number:
(to be provided by DWQ)
?__0
NCDENR °
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.
1. PROJECT INFORMATION
Project name The Preserve
Contact name Keith Roberts
Phone number 919-329=0051
Date May 6, 2008
Drainage area number 1
Ili Dt N INFORMATION
Site Characteristics
Drainage area 78,408.00 ft2
Impervious area 23,478.00 ft2
Percent impervious 29,9%
Design rainfall depth 1.00 inch
Peak Flow Calculations
1-yr, 24-hr runoff depth 0.58 in
1-yr, 24-hr intensity 0.24 in/hr
Pre-development 1-yr, 24-hr peak flow 2.03 ft3/sec
Post-development 1-yr, 24-hr peak flow 3.86 ft3/sec
Pre/Post 1-yr, 24-hr peak control 1.83 ft3lsec
Storage Volume: Non-SR Waters
Design volume 2,100.00 ft3
Storage Volume: SR Waters
Pre-development 1-yr, 24-hr runoff ft3
Post-development 1-yr, 24-hr runoff ft 3
Minimum volume required 0.00 ft3
Volume provided ft3
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 2100.00 ft2 OK
Length: 70,00 ft OK
Width: 30.00 ft OK
-or- Radius ft
Soils Report Summary
Drawdown time, ponded volume 6.00 hr OK
Drawdown time, to 24 inches below surface 24.00 hr OK
Drawdown time, total: 30.00 hr
In-situ soil:
Soil permeability in/hr
Planting media soil:
Soil permeability 1,00 in/hr OK
Soil composition
% Sand (by weight) 86% OK
% Fines (by weight) 10% OK
% Organic (by weight) 4% OK
Total: 100%
Form SW401-Bioretention-Rev.3
Parts I and II. Design Summary, Page 1 of 2
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 underdrains? (See
BMP Manual Section 12.3.6)
Additional distance between the bottom of the planting media and
the bottom of the cell to account for underdrains
Bottom of the cell required
Distance from bottom to SHWT
Type of bioretention cell (answer "Y" to only one of the two
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?
Does volume in excess of the design volume flow evenly
distributed 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 localed 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)?
(unitless)
237,00 fmsl
236.00 fmsl OK
233.00 fmsl
3.00 It
4.00 inches OK
fmsl
Y (Y or N)
3 OK
2.00 OK
1ft
232.00 fmsl
232.00 ft OK
Y (Y or N) OK
N (Y or N)
Permit Number:
(to be provided by DWQ)
0 More species are recommended,
0 More species are recommended.
0 More species are recommended.
Y (Y or N) OK
N (Y or N) Excess volume must pass through filter,
Oft
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
Y (Y or N) OK
Inlet velocity (from treatment system) ft/sec
Is the area surrounding the cell likely to undergo development in
the future? N (Y or N) OK
Are the slopes draining to the bioretention cell greater than 20%? N (Y or N) OK
Is the drainage area permanently stabilized? Y (Y or N) OK
Pretreatment Used
(Indicate Type Used with an 7" in the shaded cell)
Gravel and grass
(811nches gravel followed by 3-5 ft of grass)
Grassed swale
Forebay
Form SW401-Bioretention-Rev.3 Parts I and II. Design Summary, Page 2 of 2
Permit No:
_ (to be assigned by DWQ)
Ill 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
I 'tials Sheet No.
G 1. 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,
Overf low device, and
LC 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. /
u 3. Section view of the bioretention cell (1" = 20' or larger) showing: /V ' S I bL& fh(i? vl"
-Side slopes, 3:1 or lower
Underdrain system (if applicable), and c?'h?itrt VMS
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
- 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.
rISC 6. A construction sequence that shows how the bioretention cell will be protected from sediment until the
entire drainage area is stabilized.
/ 7. The supporting calculations (including underdrain calculations, if applicable).
8. A copy of the signed and notarized operation and maintenance (0&M) agreement.
9. A copy of the deed restrictions (if required). JJi IYO acdr?_A _6"
Form SW401-Bioretention-Rev.3 Part III, Page 1 of 1
THE PRESERVE
DRAINAGE AREA #1
DRAINAGE AREA: 1.80 AC
EXIST. IMP AREA: 0.00 AC 0.0%
PROP. IMP. AREA: 0.54 AC 30.0%
RUNOFF COEFFICIENT (C)
Cpre= 1.8 AC x 0.25 + 0.00 AC x 1.0 = 0.25
1.80 AC
Cpost= 1.3 AC x 0.25 + 0.54 AC x 1.0 = 0.48
1.80 AC

1 YEAR STORM
Qpre=CIA= 0.25 x 4.52 x 1.80 = 2.03 cfs
Qpost=CIA= 0.48 x 4.52 x 1.80 = 3.86 cfs
STORM DATA
STORM EVENT INTENSITY (I) PRECIPITATION
DEPTH P
1 YEAR 4.52 in/hr 2.1"
25 YEAR 8.50 in/hr 4.3"
100 YEAR 10.00 in/hr 5.8"
Permit Number:
(to be provided by DWQ)
ALTO AJ ?o? WATF9oG
O
NCDENR 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 III) must be printed, tilled out and submitted along with all of the required information.
L PROJECT INFORMATION
Project name The Preserve
Contact name Keith Roberts
Phone number 919-329-0051
Date May 6, 2008
Drainage area number 2
II. DESIGN INFORMATION
Site Characteristics
Drainage area 113,256.00 ft2
Impervious area 36,322.00 ft2
Percent impervious 321% %
Design rainfall depth 1.00 inch
Peak Flow Calculations
1-yr, 24-hr runoff depth 0.36 in
1-yr, 24-hr intensity 2.33 in/hr
Pre-development 1-yr, 24-hr peak flow 2.94 ft3/sec
Post-development 1-yr, 24-hr peak flow 5.75 ft3/sec
Pre/Post 1-yr, 24-hr peak control 2.81 ft3/sec
Storage Volume: Non-SR Waters
Design volume 3,675.00 ft3
Storage Volume: SR Waters
Pre-development 1-yr, 24-hr runoff ft 3
Post-development 1-yr, 24-hr runoff ft 3
Minimum volume required 0.00 ft3
Volume provided ft3
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 3675.00 ft2 OK
Length: 105.00 ft OK
Width: 35.00 ft OK
-or- Radius ft
Soils Report Summary
Drawdown time, ponded volume 6.00 hr OK
Drawdown time, to 24 inches below surface 24.00 hr OK
Drawdown time, total: 30.00 hr
In-situ soil:
Soil permeability in/hr
Planting media soil:
Soil permeability 1.00 in/hr OK
Soil composition
% Sand (by weight) 86% OK
% Fines (by weight) 10% OK
% Organic (by weight) 4/7. OK
Total: 100%
Form SW401-Bioretention-Rev.3 Parts I and II. Design Summary, Page 1 of 2
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 underdrains? (See
BMP Manual Section 12.3.6)
Additional distance between the bottom of the planting media and
the bottom of the cell to account for underdrains
Bottom of the cell required
Distance from bottom to SHWT
Type of bioretention cell (answer "Y" to only one of the two
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?
Does volume in excess of the design volume flow evenly
distributed 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 localed 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)
237.00 fmsl
236,00 fmsl
233.00 fmsl
3.00 ft
4.00 inches
fmsl
Y (Y or N)
3
2.00
1ft
232.00 fmsl
232,00 ft
OK
OK
Permit Number:
(to be provided by DWQ)
Insufficient number of clean out pipes provided.
OK
OK
Y (Y or N) OK
N (Y or N)
0 More species are recommended.
0 More species are recommended.
0 More species are recommended.
Y (Y or N) OK
N (Y or N) Excess volume must pass through filter.
Oft
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
Y (Y or N) OK
ft/sec
N (Y or N) OK
N (Y or N) OK
Y (Y or N) OK
Form SW401-Bioretention-Rev.3 Parts I and II. Design Summary, Page 2 of 2
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.
I 'tials

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.
Pagel Plan
Sheet No.
G
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.
3. Section view of the bioretention cell (1" = 20' or larger) showing: PTS f bL& f l'dvd"
Side slopes, 3:1 or lower
Underdrain system (if applicable), and Gr'?'IGt2 S'J
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.
7. The supporting calculations (including underdrain calculations, if applicable).
rlse
8. A copy of the signed and notarized operation and maintenance (0&M) agreement.
9. A copy of the deed restrictions (if required). 1/7 /l k /'eord 4 iy
Q ae.-Kai Ao"
Form SW401-Bioretention-Rev.3 Part III, Page 1 of 1
THE PRESERVE
DRAINAGE AREA #2
DRAINAGE AREA: 2.60 AC
EXIST. IMP AREA: 0.00 AC 0.0%
PROP. IMP. AREA: 0.83 AC 31.9%
RUNOFF COEFFICIENT (C)
Cpre= 2.6 AC x 0.25 + 0.00 AC x 1.0 =.0.25
2.60 AC
Cpost= 1.8 AC x 0.25 + 0.83 AC x 1.0 =-0.49
2.60 AC
STORM DATA
STORM EVENT INTENSITY (I) PRECIPITATION
DEPTH P
1 YEAR 4.52 in/hr 2.1"
25 YEAR 8.50 in/hr 4.3"
100 YEAR 10.00 in/hr 5.8"
1 YEAR STORM
Qpre=CIA= 0.25 x 4.52 x 2.60 = 2.94 cfs
Qpost=CIA= 0.49 x 4.52 x 2.60 = 5.75 cfs
Permit Number:
(to be provided by DWQ)
CDN o??F W A jFRQG
r
ATA
R Y
N
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. PROJECT INFORMATION
Project name he Fresem
Contact name Keith Roberts
Phone number 919-329-0051
Date May 6, 2008
Drainage area number 3
II. DESIGN INFORMATION
Site Characteristics
Drainage area 30,492.00 ft2
Impervious area 4,400.00 ft2
Percent impervious 14.4% %
Design rainfall depth 1.00 inch
Peak Flow Calculations
1-yr, 24-hr runoff depth 0.36 in
1-yr, 24-hr intensity 12.01 in/hr
Pre-development 1-yr, 24-hr peak flow 0.79 ft3/sec
Post-development 1-yr, 24-hr peak flow 1.13 ft3/sec
Pre/Post 1-yr, 24-hr peak control 0.34 ft3/sec
Storage Volume: Non-SR Waters
Design volume 578.00 ft3
Storage Volume: SR Waters
Pre-development 1-yr, 24-hr runoff ft 3
Post-development 1-yr, 24-hr runoff ft3
Minimum volume required 0.00 ft3
Volume provided ft 3
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 578.00 ft2 OK
Length: 34.00 ft OK
Width: 17.00 ft OK
-or- Radius ft
Soils Report Summary
Drawdown time, ponded volume 6.00 hr OK
Drawdown time, to 24 inches below surface 24.00 hr OK
Drawdown time, total: 30.00 hr
In-situ soil:
Soil permeability in/hr
Planting media soil.,
Soil permeability 1.00 in/hr OK
Soil composition
% Sand (by weight) 86% OK
% Fines (by weight) 10% OK
% Organic (by weight) 4% OK
Total: 100%
Form SW401-Bioretention-Rev.3 Parts I and It. 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?
(unitless)
252.00 fmsl
251.00 fmsl
248.00 fmsl
3.00 ft
4.00 inches
fmsl
Y (Y or N)
How many clean out pipes are being installed? 2
What factor of safety is used for sizing the underdrains? (See

BMP Manual Section 12.3.6) 2.00
Additional distance between the bottom of the planting media and

the bottom of the cell to account for underdrains 1 ft
Bottom of the cell required 247.00 fmsl
Distance from bottom to SHWT 247.00 ft
Type of bioretention cell (answer "Y" to only one of the two
following questions):
OK
OK
OK
OK
OK
Is this a grassed cell? Y (Y or N) OK
Is this a cell with trees/shrubs? N (Y or N)
Planting Plan
Number of tree species 0 More species are recommended.
Number of shrub species 0 More species are recommended.
Number of herbaceous groundcover species 0 More species are recommended.
Additional Information
Does volume in excess of the design volume bypass the Y (Y or N) OK
bioretention cell?
Does volume in excess of the design volume flow evenly N (Y or N) Excess volume must pass through filter.
distributed through a vegetated filter?
What is the length of the vegetated filter? 0 ft
Does the design use a level spreader to evenly distribute flow? N (Y or N) Show how flow is evenly distributed.
Is the BMP located at least 30 feet from surface waters (50 feet if

SA waters)? Y (Y or N)
Is the BMP localed at least 100 feet from water supply wells? Y (Y or N)
Are the vegetated side slopes equal to or less than 3:1? Y (Y or N)
Is the BMP located in a recorded drainage easement with a

recorded access easement to a public Right of Way (ROW)? Y (Y or N)
Inlet velocity (from treatment system) ft/sec
Is the area surrounding the cell likely to undergo development in N (Y or N)
the future?
Are the slopes draining to the bioretention cell greater than 20%? N (Y or N)
Is the drainage area permanently stabilized? Y (Y or N)
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
OK
OK
OK
OK
OK
OK
OK
Form SW401-Bioretention-Rev.3 Parts I and II. Design Summary, Page 2 of 2
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
I 'tials Sheet No.
G 1. 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
LL Boundaries of drainage easement.
/ 7?1 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. f_ / 1
v 3. Section view of the bioretention cell (1" = 20' or larger) showing: i s 1 bL& f11ri1 vd"
Side slopes, 3:1 or lower /
Underdrain system (if applicable), and !?'h'/G11 S' r
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
- 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.
r?SC 6. A construction sequence that shows how the bioretention cell will be protected from sediment until the
entire drainage area is stabilized.
7. The supporting calculations (including underdrain calculations, if applicable).
8. A copy of the signed and notarized operation and maintenance (0&M) agreement.
9. A copy of the deed restrictions (if required). l?i l ? tac /?f?C?}'G(G? "'f Q aeei- A-176'"
Form SW401-Bioretention-Rev.3 Part III, Page 1 of 1
THE PRESERVE
DRAINAGE AREA #3
DRAINAGE AREA: 0.70 AC
EXIST. IMP AREA: 0.00 AC 0.0%
PROP. IMP. AREA: 0.10 AC 14.3%
RUNOFF COEFFICIENT (C)
Cpre= 0.7 AC x 0.25 + 0.00 AC x 1.0 = 0.25
0.70 AC
Cpost= 0.6 AC x 0.25 + 0.10 AC x 1.0 = 0.36
0.70 AC

1 YEAR STORM
Qpre=CIA= 0.25 x 4.52 x 0.70 = 0.79 cfs
Qpost=CIA= 0.36 x 4.52 x 0.70 = 1.13 cfs
STORM DATA
STORM EVENT INTENSITY( I) PRECIPITATION
DEPTH P
1 YEAR 4.52 in/hr 2.1"
25 YEAR 8.50 in/hr 4.3"
100 YEAR 10.00 in/hr 5.8"
Permit Number:
(to be provided by DWQ)
Drainage Area Number: f
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 problems: How I will remediate the problem:
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 application.
The inlet device: pipe, The pipe is clogged (if Unclog the pipe. Dispose of the
stone verge or Swale applicable). sediment off-site.
The pipe is cracked or Replace the pipe.
otherwise damaged (if
applicable).
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 problems with erosion.
Stone verge is clogged or Remove sediment and clogged
covered in sediment (if stone and replace with clean stone.
applicable).
Form SW401-Bioretention O&M-Rev.3 Page 1 of 4
BMP element: Potential problems: How I will remediate the problem:
The pretreatment area Flow is bypassing Regrade if necessary to route all
pretreatment area and/or flow to the pretreatment area.
flies have formed. Restabilize the area after grading.
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 pretreatment area.
Erosion has occurred. Provide additional erosion
protection such as reinforced turf
matting or riprap if needed to
prevent future erosion problems.
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 a one-time
fertilizer application to establish the
ground cover if a soil test indicates
it is necessary.
Tree stakes/wires are present Remove tree stake/wires (which
six months after planting. 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 depth 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
possible.
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 planting media.
Form SW401-Bioretention O&M-Rev.3 Page 2 of 4
BMP element: Potential problems: How I will remediate the problem:
The underdrain system Clogging has occurred. Wash out the underdrain system.
if applicable)
The drop inlet Clogging has occurred. Clean out the drop inlet. Dispose of
the sediment off-site.
The drop inlet is damaged Repair or replace the drop 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: -J-kg. ?cese- VVe
BMP drainage area number: S i o re4--cA i o-.. C 1(
Printname: 6+anaI * Lcnao LLG
Title:
Address:
Phone:
Signature
Date:
Note: The legally responsible party should not be a homeowners association unless more than 50% of
the lots have been sold and a resident of the subdivision has been named the president.
I, In n P. 444., , a Notary Public for the State of
C, , County of SohY-,gNy yx , do hereby certify that
l'` e'Ax•++L \.. S?•d?anc.? personally appeared before me this d
day of p0? , and acknowledge the due execution of the
forgoing bioretention maintenance requirements. Witness my hand and official seal,
•roa©?,0? A R ?'r?y
z
=, ,,oy pU13V ?.-
• NSTON ??J .
SEAL
My commission expires 11 " A a - I
Form SW401-Bioretention I&M-Rev. 2 Page 4 of 4
Permit Number:
(to be provided by DWQ)
Drainage Area Number: .2-
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 problems: How I will remediate the problem:
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 application.
The inlet device: pipe, The pipe is clogged (if Unclog the pipe. Dispose of the
stone verge or swale applicable). sediment off-site.
The pipe is cracked or Replace the pipe.
otherwise damaged (if
applicable).
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 problems with erosion.
Stone verge is clogged or Remove sediment and clogged
covered in sediment (if stone and replace with clean stone.
applicable).
Form SW401-Bioretention O&M-Rev.3 Page 1 of 4
BMP element: Potential problems: How I will remediate the problem:
The pretreatment area Flow is bypassing Regrade if necessary to route all
pretreatment area and/or flow to the pretreatment area.
flies have formed. Restabilize the area after grading.
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 pretreatment area.
Erosion has occurred. Provide additional erosion
protection such as reinforced turf
matting or riprap if needed to
prevent future erosion problems.
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 a one-time
fertilizer application to establish the
ground cover if a soil test indicates
it is necessary.
Tree stakes/wires are present Remove tree stake/ wires (which
six months after planting. 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 depth 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 planting media.
Form SW401-Bioretention O&M-Rev.3 Page 2 of 4
BMP element: Potential problems: How I will remediate the problem:
The underdrain system Clogging has occurred. Wash out the underdrain system.
if applicable)
The drop inlet Clogging has occurred. Clean out the drop inlet. Dispose of
the sediment off-site.
The drop inlet is damaged Repair or replace the drop 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: -rk , 1?,r est yy/e
BMP drainage area number:_ Ce-k? 7
Print name: g - ar? e-; I -k Lo n qO [. t-L
Title:
I, Y Q Goy A S? o r , a Notary Public for the State of
r C , County of :SOVYkSk-o v\ , do hereby certify that
1'YcAMe- V . personally appeared before me this ;kr
day of YI-\ &-4 pp$ , and acknowledge the due execution of the
forgoing bioretention maintenance requirements. Witness my hand and official seal,
oP?.?AR Yr?ti
V ?_
Ns7-
SE AL My commission expires 11 ' a a ?i

Form SW401-Bioretention I&M-Rev. 2 Page 4 of 4
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.
Permit Number:
(to be provided by DWQ)
Drainage Area Number: ?3
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 problems: How I will remediate the problem:
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 application.
The inlet device: pipe, The pipe is clogged (if Unclog the pipe. Dispose of the
stone verge or Swale applicable). sediment off-site.
The pipe is cracked or Replace the pipe.
otherwise damaged (if
applicable).
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 problems with erosion.
Stone verge is clogged or Remove sediment and clogged
covered in sediment (if stone and replace with clean stone.
applicable).
Form SW401-Bioretention O&M-Rev.3 Page 1 of 4
BMP element: Potential problems: How I will remediate the problem:
The pretreatment area Flow is bypassing Regrade if necessary to route all
pretreatment area and/or flow to the pretreatment area.
hies have formed. Restabilize the area after grading.
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 pretreatment area.
Erosion has occurred. Provide additional erosion
protection such as reinforced turf
matting or riprap if needed to
prevent future erosion problems.
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 a one-time
fertilizer application to establish the
ground cover if a soil test indicates
it is necessary.
Tree stakes/wires are present Remove tree stake/ wires (which
six months after planting. 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 depth 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
possible.
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 planting media.
Form SW401-Bioretention O&M-Rev.3 Page 2 of 4
BMP element: Potential problems: How I will remediate the problem:
The underdrain system Clogging has occurred. Wash out the underdrain system.
if applicable)
The drop inlet Clogging has occurred. Clean out the drop inlet. Dispose of
the sediment off-site.
The drop inlet is damaged Repair or replace the drop 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: -rkt_ ,resevye
BMP drainage area number: 70,nr2 A6)I e11
Print name: g -) ane- I -Y Lo n Qo L LL
Title:
Note: The legally responsible party should not be a homeowners association unless more than 50% of
the lots have been sold and a resident of the subdivision has been named the president.
I? r ?Dk A S V p `^ , a Notary Public for the State of
County of Sohr,s-V* vN , do hereby certify that
h
c?d%e ?... SVN personally appeared before me this d
day of Y?\ o!!I o 002 , and acknowledge the due execution of the
forgoing bioretention maintenance requirements. Witness my hand and official seal,
?o Y
v V
ASTON G?? .
SEAL ( )??

My commission expires "' A t?- 11
Form SW401-Bioretention I&M-Rev. 2 Page 4 of 4
May 14 2008 10:17nM Lester Stancil & nssociat 919-639-2602 P.1
May 13 08 04:00p michael Baker 9108224540 p.4
Southeastern Soil & Environmental Associates Inc.
P.O. Box 9321
Fayetteville, NC 28311
PhwelFax [phone]
Email rNkeftWheaslemsoll.com
.Aprd 13, 2008
Mr. Lester Stancil
Stancil & Associates, P.A.
PO Box 730
Angier, NC 27501
Re: Hydraulic conductivity (permeability) analysis & seasonal water table determination
(SHWT) for bioretention areas, Preserve Subdivision, NC Hwy. 50, Johnston County,
North Carolina
Dear Mr. Stancil,
An evaluation of soil properties and hydraulic conductivity (Ksat) has been conducted at
your request on the aforementioned property. The purpose of the investigation was to
determine soil water table depths at proposed bioretention locations. In addition, Ksat
was to be provided at varying depths for use with bioretention pond design.
Saturated hydraulic conductivity of the unsaturated zone was measured in a similar
method as described in the Soil Science Society of America Journal, Vol. 53, no 5, Sept. -
Oct. 1989, "A Constant Permeameter for Measuring Saturated Hydraulic Conductivity of
the Vadose Zone" and Comparison of the Glover Solution with the Simultaneous
Equations Approach for Measuring Hydraulic Conductivity."
Soils at this site are most similar to the Uchee soil series (see attached boring lob). Three
borings were advanced to 8 feet. Seasonal High Water Table (SHWT) as determined by
evidence of colors of chrome. 2 or less (and/or concentrations of high redox mottles) was
encountered at 49 inches below the ground surface in boring "A" (no free water was noted
within 96 inches of the soil surface during the day of testing). SMUT in boring "B" was
encountered at 36 inches below the soil surface. (free water was encountered at 72 inches
below the soil surface). S.>E WT in boring "C" was encountered at tit inches below the soil
surface (no free water was encountered at 96 inches below the soil surface on the day of
testing).
SOIL/SITE EVALUATION • SOIL PHYSICAL ANALYSIS • LAND USEISUBDIVIS" PLANNING
GROUNDWATER DRAINAGE/MOUNDING • SURFACEISUBSURFACE WASTE TREATMENT SYSTEM% EVALtAnON 6 DESIGN

MaU 14 2008 10:17nM Lester Stancil & nssociat 919-639-2602
May 13 08 04:DOp
micheel esker
9108224540
Six compact constant head permearneter (CCHP) tests were conducted at depths ranging
from 3 to 6 feet.
The attached map shows locations of sample points as well as Ksat locations (located by
measurements from property lines; heavy vegetation prevented GPS location). The
attached chart provides a list of measured rates at the proposed pit locations.
I trust this is the int'ormation yuu require at this time.
Sincerely,
W,4,-
Mike Eaker
President
?p SOIL S F
?
JG?
to
IN
7030
p.3
p.2
May 14 2008 10:17RM Lester Stancil & Rssociat 919-639-2602 p.3
May 13 08 04:03p michael eaker 9108224540 p.5
Southeastern Soil & Environmental Associates, Inc.
P.O. Box 9321
Fayetteville, NO 28311
Phone/Fax [phone]
Email mike®southeastemsoY corn
Typical Profile Description for Map Unit Uchee
This map unit consists of very deep, well drained, soils on side slopes in uplands. These
soils formed in unconsolidated marine and fluvial sediments. Slopes range from 3 to 12
percent.
A - 0 to 10 inches; grayish brown (1 OYR 5/2) loamy sand; weak fine granular structure;
very friable; few fine roots; clear smooth boundary.
E - 10 to 24 inches; light yellowish brown (IOYR 614) loamy sand; weak fine granular
structure: very friable; clear smooth boundary.
Bt - 24 to 43 inches; yellowish brown (I OYR 5/6) sandy clay loam; common medium
prominent red (1 OR 418) and common medium distinct pale yellow (2.5Y 7/4) mottles;
weak medium subangular blocky structure, friable; sticky and slightly plastic; common
faint clay films on faces of peds; about 1.0 percent fine gravel; clear smooth boundary.
BC - 43 to 52 inches; mottled yellowish brown (IOYR 5/8), red (1 OR 4/6) and pale yellow
(2.5Y 7/4) sandy clay loam; weak medium subangular blocky structure; friable; sticky and
slightly plastic; few faint clay films on faces of peds; gradual wavy boundary.
C - 52 to 96 inches; mottled red (2.5YR 5/6), light gray (IOYR 712) and brownish yellow
(1 OYR 6/G) sandy clay loam; massive, triable, slightly sticky, slightly plastic.
SOIUSITE EVALUATION • SON. PHYSICAL ANALYSIS - LAND USFJSUMVISION PLANNING
GROUNDWATER DRAWAGEN=NDING • SURFACE18ussURFACE WASTE TREATMENT SYSTEMS, EVALUATION $ DESIGN
May 14 2008 10:17nM Lester Stancil & Associat 919-639-2602
May 13 08 04t00p michael maker
9108224540
p.4
P. 1
I
I?
I?
a

1
?i

r. .

L
May 14 2008 10:17AM Lester Stancil a Rssociat 919-639-2602
May 13 08 04:00p miahawl waker 9108224540
P.5
p.2
Southeastern Soil & Environmental Associates, Inc.
P.O. Box 8321
Fayenetillb. NC 28911
Phone*a x [phone]
Emal n*aOsoutheaslemsol corn
Ksat measurements for Preserve Subdivision
Ksat Ksat
Location D th in CM/hr in/hr
A 48 1.01 0.40
A 72 0.92 0.36
B 36 1.33 0.52
B 53 1.11 0.44
C 40 1.42 0.56
C 66 0.98 0.38
SOIUBITE EVALUATION • SOIL PHYSICAL ANALYSIS • LAND USEOSUBDIVISION PLANNING
GROUNDWATER DRAINAGFIMOUNDING • SURFAC&SUBSURFACE WASTE TREATMENT SYSTEMS, EVALUATION a OESI0N