20120432 Ver 1_More Info Received_20120716

DM. th
5400 Glenwood Avenue Suite 300
Raleigh North Carolina 27612
tel [phone]
fax [phone]
cdmsmith com
July 13 2012
�G r
Ms Karen Higgins
!,�/j
North Carolina Division of Water Quality (Central Office)
512 North Salisbury Street J(�i {
Raleigh North Carolina 27604
Subject SGWASA WWTP Improvements (DWQ Project # 12 0432)
Response to Request for Additional Information
Dear Ms Higgins
This letter responds to the Division s May 30 2012 letter from Danny Smith requesting additional
information regarding the 401 Water Quality Certification (Isolated Waters) application for the
South Granville Water and Sewer Authority ( SGWASA) Wastewater Treatment Plant (WWTP)
Improvements project Responses to your comments are listed below
Comment 1 The PCN application explains thatyou will only partially fill the wetland while the entire
system will be drained
a Please explain the method of draining that will be utilized
Response Water from the wetland will be pumped out in accordance with
specifications for excavation dewatering (Section 02140 paragraph 3 03) In the
event that the dewatering exceeds 50 NTU a sedimentation bag (Sheet CD 1 Detail D)
will be installed on the pump discharge Please see Attachment A for the specification
and detail
b Please explain why the entire wetland needs to be impacted while it appears that only a
portion of the wetland will need to be impacted based on the limits of structural fill identified
on Figure 1 Please demonstrate avoidance and minimization of impacts
Response The purpose of removing the entire wetland is to avoid impacts to
permanent structures (equalization basins) that could be caused by uplift from
impounded water in the area The current surface elevation of the wetland (298 2) is
higher than the base slab elevation of the Equalization Basins (2910) Due to the
close proximity of the two the potential exists for the basin slabs to float when
empty possibly cracking or damaging the slabs This damage could potentially result
WATER + ENVIRONMENT + TRANSPORTATION + ENERGY + FACILITIES

CDM. Sith
Ms Karen Higgins
July 13 2012
Page 2
in the stored wastewater leaking out of the basins Once drained the wetland will be
backfilled and graded to allow positive drainage away from the equalization basins
Vegetation will be established in the areas outside the equalization basins access
road and gravel maintenance area
Comment 2 Please either (a) Provide evidence showing that this project meets all of the
requirements for low density development found in Appendix of State General Permit No
IWGP100000 or (b) Provide a Stormwater Management Plan that removes a minimum of 85
percent TSS and 30 percent TN and TP from the stormwatergenerated by this project
Response Rob Hopper (CDM Smith) and I met with Annette Lucas on June 28 to discuss
the Stormwater Management Plan for this project We have prepared a Stormwater
Management Plan which is enclosed as Attachment B
The Stormwater Management Plan consists of two bioretention areas (Bioretention
Cells 1 and 2) Stormwater from the remainder of the proposed work will be routed
back into the WWTP for treatment (the WWTP improvements are being designed to
achieve maximum annual average effluent concentrations of 3 0 mg /l TN and 0 2 to 0 25
mg /l TP) These areas are designated on the enclosed site plan (Attachment B) and are
described below
The proposed WWTP improvements project consists of work in four areas
• Headworks This work includes construction of a new influent pump station grit
removal and screening facilities generator electrical building and pavement to
replace the existing pretreatment unit Stormwater from this area will be
treated by Bioretention Cell 1 Based on CDM Smith s soil test pit within the
footprint of this bioretention cell the seasonal high water table (SHWT) is
located more than 2 feet below the underdrain of this cell A BMP Supplement
Form checklist and signed O &M Agreement are included in Attachment B
• Flow equalization basins This work includes construction of two new open tank
equalization basins an access road and a gravel maintenance area surrounding
the equalization basins Stormwater from this area will be treated by
Bioretention Cell 2 Based on CDM Smith s soil test pit within the footprint of this
bioretention cell, the seasonal high water table (SHWT) is located more than 2
feet below the underdrain of this cell A BMP Supplement Form checklist and
signed 0 &M Agreement are included in Attachment B
i�

Smith
Ms Karen Higgins
July 13 2012
Page 3
• Solids handling facilities This work includes a new dewatering building and
covered cake storage for biosolids The water table in this area is too high for
bioretention CDM Smith evaluated other BMPs for this area however due to
size constraints and the nutrient removal needed the most practical means of
treating stormwater from this area is to route it directly to the WWTP
headworks for treatment by the plant itself
• Denitrification filters This work includes new denitirifcathon filters to be
constructed in an open area across from the existing effluent filters The filters
will be open but stormwater treatment is needed for the pavement and portion
of the structure that is covered The water table in this area is too high for
bioretention CDM Smith evaluated other BMPs for this area however due to
size constraints and the nutrient removal needed the most practical means of
treating stormwater from this area is to route it directly to the WWTP
headworks for treatment by the plant itself
The Stormwater Management Plan in Attachment B includes a site plan and a
Supplement Form 0 &M Agreement and checklist documentation for the two
bioretention cells
Enclosed please find five copies of this letter with the attachments Please call me at (919) 325
3508 or email me at boonekrPcdmsmith com if you have any questions or need additional
information Thank you for your assistance with this project
Sincerely
Kelly R Boone P E
CDM Smith Inc
cc Annette Lucas DWQ Central Office
Lauren Witherspoon DWQ Raleigh Regional Office
Terry Hatcher NC DHHS Property and Construction Division
Lindsay Mize SGWASA
Jim Butcher CDM Smith
Rob Hopper CDM Smith
fi

SGWASA WWTP Improvements
Attachment A
Additional Information on Draining of Isolated Wetland
Specification Section 02140 and
Detail D from Sheet CD -1

© 2012 CDM Smith
All Rights Reserved
SECTION 02140
DEWATERING AND DRAINAGE
PART1 GENERAL
101 SCOPE OF WORK
A Design furnish install operate monitor maintain and remove a temporary dewatering system as
necessary to lower and control water levels 2 feet below subgrades of excavations to permit
construction in the dry
B Provide maintain and remove temporary surface water control measures adequate to drain and
remove surface water entering excavations
C Collect and properly dispose of all discharge water from the dewatering and drainage systems
D Repair damage caused by dewatering and drainage system operations
E Remove temporary dewatering and drainage systems when no longer needed Restore all disturbed
areas
F Obtain and pay for all permits required for dewatering and drainage systems
G Repair damage caused by dewatering and drainage system operations at no additional cost to the
Design/Builder
1 02 RELATED WORK
A Earthwork is included in Section 02200
B Sedimentation and Erosion Control is included in Section 02270
C Site Preparation is included in 02100
103 SUBMITTALS
A Dewatering and drainage system designs shall be prepared by a licensed professional engineer
registered in North Carolina having a minimum of 5 years of professional experience in the design
and construction of dewatering and drainage systems Submit an original and three copies of the
licensed professional engineer s certification on the PE form specified in Section 01300 stating
that the dewatering and drainage system designs have been prepared by the professional engineer
and that the professional engineer will be responsible for their execution Dewatering design shall
be compatible with the proposed excavation plan which shall be referenced in the submittal Do
not submit dewatering and drainage system designs unless requested in writing
54378 82186 02140 1 July 2012

C 2012 CDM Smith
All Rights Reserved
104 DEFINITIONS
A Where the phrase in the dry is used in this Section it shall be defined as an excavation subgrade
where the groundwater level has been lowered to at least 2 foot below the lowest level of the
excavation is stable with no ponded water mud or muck is able to support construction
equipment without rutting or disturbance and is suitable for the placement and compaction of fill
material pipe or concrete foundations
PART 2 PRODUCTS
201 MATERIALS
A Pipe for observation wells if required shall consist of a screen casing and cap Casing shall be
minimum 1 0 inch I D Schedule 80 PVC pipe with machine slotted PVC wellpoints Maximum
wellpomt slot size shall be 0 020 in
B Piping pumping equipment and all other materials required to provide control of surface water
and groundwater in excavations shall be suitable for the intended purpose
C Standby pumping systems and a source of standby power shall be maintained at all times
PART 3 EXECUTION
301 GENERAL
A The Subcontractor shall control surface water and groundwater such that excavation to final grade
is made in the dry and bearing soils are maintained undisturbed Prevent softening and/or
instability or disturbance to the subgrade due to water seepage All construction and backfilling
shall proceed in the dry and flotation of completed portions of work shall be prohibited
B Provide protection against flotation for all work
C The impact of anticipated subsurface soil /water conditions shall be considered when selecting
methods of excavation and temporary dewatering and drainage systems Where groundwater levels
are above the proposed bottoms of excavations a pumped dewatering system is expected for
predrainage of the soils prior to excavation to final grade and for maintenance of the lowered
groundwater level until construction has been completed to such an extent that the foundation
structure pipe conduit or fill will not be floated or otherwise damaged Type of dewatering
system spacing of dewatering units and other details of the work are expected to vary with
soil/water conditions at a particular location Dewatermg plan shall be compatible with the
proposed excavation and excavation support system design
D Dewatering system shall maintain groundwater levels a minimum of 2 feet below the bottom of
excavation at all times
3 02 SURFACE WATER CONTROL
A The Subcontractor shall construct surface water control measures including dikes ditches sumps
and other methods to prevent as necessary flow of surface water into excavations
54378 82186 02140 2 July 2012

C 2012 CDM Smith
All Rights Reserved
3 03 EXCAVATION DEWATERING
A At all times during construction the Subcontractor shall provide and maintain proper equipment
and facilities to promptly remove and properly dispose of all water entering excavations
Excavations shall be kept dry so as to obtain a satisfactory undisturbed subgrade foundation
condition throughout construction below grade including backfill and fill placement
B Pipe conduit or masonry shall not be laid in water or submerged prior to backfillmg Pipe
conduit or masonry which becomes submerged shall be removed and the excavation dewatered
and restored to proper conditions prior to remstalling the pipe conduit or masonry Water shall
not flow over new masonry within 4 days after placement Excavations for foundations and
structures shall be maintained in the dry for a minimum of 4 days after concrete placement
C In no event shall water rise to cause unbalanced pressure in structures until the concrete or mortar
has set at least 24 hours The Subcontractor shall prevent flotation of the pipe by promptly placing
backfill Flotation shall be prevented by maintaining a positive and continuous operation of the
dewatermg system The Subcontractor shall be fully responsible and liable for all damages which
may result from failure of this system
D Take all additional precautions to prevent uplift of any structure during construction
E Dewatering and drainage operations shall at all times be conducted in such a manner as to preserve
the natural undisturbed capacity of the subgrade soils at proposed bottom of excavation and to
preserve the integrity of adjacent structures If the subgrade of the trench bottom or excavation
becomes disturbed due to for any reason the Subcontractor shall excavate below normal grade as
directed by the Design/Builder s Construction Manager and refill with concrete compacted
granular fill or other approved material to restore the bearing capacity of the subgrade to its
original undisturbed condition at no additional cost to the Design/Builder
F The Subcontractor shall evaluate the impact of the anticipated subsurface soil/water conditions on
his proposed method of excavation and removal of water
G The Subcontractor will be required at all times to dewater and excavate in a manner which does
not cause loss of ground or disturbance to the pipe bearing soil or soil which supports overlying or
adjacent structures
H If the method of dewatering does not dewater the trench as specified install groundwater
observation wells as directed Do not place any pipe or structure until the readings obtained from
the observation wells indicate that the groundwater has been lowered a minimum of 1 foot below
the bottom of the final excavation within the trench limits
I Well or sump installations shall be constructed with proper sand filters to prevent drawing of finer
grained soil from the surrounding ground
Water entering the excavation from precipitation or surface runoff shall be collected in shallow
ditches around the perimeter of the excavation drained to sump and pumped from the excavation
to maintain a bottom free from standing water
54378 82186 02140 3 July 2012

© 2012 CDM Smith
All Rights Reserved
K All pumping equipment shall be electric motor driven or shall have an internal combustion engine
with maximum noise of 85 dBA at a distance of 10 feet from the equipment No internal
combustion engines exceeding this noise limit shall be used between the hours of 5 00 p m and
8 00 a m The Subcontractor shall provide connections to a commercial power supply for electric
motor driven pumps or shall use generators meeting this noise limit
L Drainage shall be disposed of in an approved area as specified in Sections 01110 and 02576
Existing or new sanitary sewers shall not be used to dispose of drainage unless the written
permission of the utility or property owner is obtained
M All water removed from the construction site shall be discharged through pipes or open ditches or
trenches Permission to use any storm sewers or drains for water disposal purposes shall be
obtained from the authority having Jurisdiction Conform to any requirements and pay all costs for
such Do not cause flooding by overloading or blocking up the flow in drainage facilities Leave
the facilities unrestricted and as clean as originally found Pay for and repair any damage to
facilities to restore them to their original condition
N Take all necessary precautions to preclude the accidental discharge of fuel oil etc in order to
prevent adverse effects on groundwater quality
O Remove dewatering equipment after the system is no longer required
END OF SECTION
54378 82186 02140 4 July 2012

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SGWASA WWTP Improvements
Attachment B
Stormwater Management Plan

Checklist and Supplemental Form for
Bioretention Cells 1 and 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
Initials Sheet No
L-1 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
Recorded drainage easement and public right of way (ROW)
Clean out pipe locations
Overflow device and
Boundaries of drainage easement
C-- KA 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
Indicate the P Index between 10 and 30
3 Section view of the bioretention cell (1 20 or larger) showing
Side slopes 31 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]
T 1ACl1<CD 4 A soils report that is based upon an actual field investigation soil borings and infiltration tests The
results of the sods 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 sod and the in
situ sod must include
Sod permeability
Soil composition (°/ sand % fines °/ organic) and
P index
AT7-44#,Ci� 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
Af(fEC/f� i� 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 underdram calculations if applicable)
ill) 8 A copy of the signed and notarized inspection and maintenance (I &M) agreement
41—TA46!K, 9 A copy of the deed restriction
Form SW401 Bioretention Rev 7 Part III Page 1 of 1

A X.1
WDENR
Permit Number
(to be provided by DWQ)
y�O� WATFROy
> r
ti
o <
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 111) must be printed filled out and submitted along with all of the required information
I PROJECT INFORMATION
Project name SGWASA WWTP Improvements
Contact name Lindsay Mize
Phone number 919 575 3367
Date July 11 2011
Drainage area number Cell 1
II DESIGN INFORMATION
N (Y or N)
Site Characteristics
1 yr 24 hr runoff depth
Drainage area
35 502 ft2
Impervious area
21 725 ftz
Percent impervious
612% %
Design rainfall depth
10 inch
Peak Flow Calculations
Is pre /post control of the 1 yr 24 hr peak flow required?
N (Y or N)
1 yr 24 hr runoff depth
in
1 yr 24 hr intensity
In/hr
Pre - development 1 yr 24 hr peak flow
ft3 /sec
Post development 1 yr 24 hr peak flow
ft3 /sec
Pre /Post 1 yr 24 hr peak control
ft3 /sec
Storage Volume Non SA Waters
Minimum volume required
1 777 0 ft3
Volume provided
1 800 0 ft3
OK
Storage Volume SA Waters
15 runoff volume
ft3
Pre development 1 yr 24 hr runoff
ft3
Post - development 1 yr 24 hr runoff
ft3
Minimum volume required
0 ft3
Volume provided
ft3
Cell Dimensions
Ponding depth of water
12 Inches
OK
Ponding depth of water
1 00 ft
Surface area of the top of the bioretention cell
1 800 0 ftz
OK
Length
90 ft
OK
Width
20 ft
OK
-or Radius
ft
Media and Soils Summary
Drawdown time ponded volume
12 hr
OK
Drawdown time to 24 Inches below surface
109 hr
OK
Drawdown time total
229 hr
In situ soil
Soil permeability
Unknown in/hr
OK
Planting media soil
Soil permeability
100 in/hr
OK
Soil composition
% Sand (by volume)
880/
OK
% Fines (by volume)
8%
OK
% Organic (by volume)
4%
OK
Total
100%
Phosphorus Index (P Index) of media
20 (unitless)
OK
Form SW401 Bioretention Rev 8
June 25 2010 Parts I and 11 Design Summary Page 1 of 4

Permit Number
(to be provided by DWQ)
Basin Elevations
Temporary pool elevation
268 92 fmsl
Type of bioretention cell (answer Y to only one of the two
following questions)
Is this a grassed cell?
Y
(Y or N)
OK
Is this a cell with trees /shrubs?
N
(Y or N)
Planting elevation (top of the mulch or grass sod layer)
267 92 fmsl
Depth of mulch
0 Inches
Insufficient mulch depth unless Installing grassed cell
Bottom of the planting media soil
265 92 fmsl
Planting media depth
2 ft
Depth of washed sand below planting media soil
0 333333333 ft
Are underdrains being Installed?
Y
(Y or N)
How many clean out pipes are being installed?
2
OK
What factor of safety Is used for sizing the underdrains? (See
10
OK
BMP Manual Section 12 3 6)
Additional distance between the bottom of the planting media and
1 ft
the bottom of the cell to account for underdrains
Bottom of the cell required
264 5833333 fmsl
SHWT elevation
262 5 fmsl
Distance from bottom to SHWT
2 083333333 ft
OK
Internal Water Storage Zone (IWS)
Does the design Include IWS
N
(Y or N)
Elevation of the top of the upturned elbow
fmSI
Separation of IWS and Surface
267 9166667
ft
Planting Plan
Number of tree species
0
Number of shrub species
0
Number of herbaceous groundcover species
1
Recommend more species
Additional Information
Does volume In excess of the design volume bypass the
N
(Y or N)
Excess volume must bypass cell
bioretention cells
Does volume In excess of the design volume flow evenly distributed
N
(Y or N)
Excess volume must pass through filter
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
Y
(Y or N)
OK
SA waters)?
Is the BMP localed at least 100 feet from water supply wells?
Y
(Y or N)
OK
Are the vegetated side slopes equal to or less than 3 V
Y
(Y or N)
OK
Is the BMP located In a proposed drainage easement with access
N
(Y or N)
Insufficient ROW location
to a public Right of Way (ROW)?
Inlet velocity (from treatment system)
575 ft/sec
Insufficient Inlet velocity unless energy dissipating devices are
being used
Is the area surrounding the cell likely to undergo development in
N
(Y or N)
OK
the future?
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 X in the shaded cell)
Gravel and grass
X
(flinches gravel followed by 3 5 ft of grass)
Grassed Swale
OK
Forebay
Other
Form SW401 Bioretention Rev 8
June 25 2010 Parts I and 11 Design Summary Page 2 of 4

Permit Number
(to be provided by DWQ)
O�O� W ATFAOG
A� y
'V
HCDENR <
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 111) must be printed filled out and submitted along with all of the required information
I PROJECT INFORMATION
N (Y or N)
Project name
SGWASA WWTP Improvements
Contact name
Lindsay Mize
Phone number
919 575 3367
Date
July 11 2012
Drainage area number
Cell 2
II DESIGN INFORMATION
ft' /sec
Site Characteristics
Pre /Post 1 yr 24 hr peak control
Drainage area
39 572 ft2
Impervious area
23102 ft2
Percent Impervious
584% %
Design rainfall depth
10 Inch
Peak Flow Calculations
Is pre /post control of the 1 yr 24 hr peak flow required?
N (Y or N)
OK
1 yr 24 hr runoff depth
in
OK
1 yr 24 hr intensity
in /hr
Pre - development 1 yr 24 hr peak flow
ft' /sec
Post development 1 yr 24 hr peak flow
ft' /sec
OK
Pre /Post 1 yr 24 hr peak control
ft3 /sec
Storage Volume Non SA Waters
100 in /hr
OK
Minimum volume required
1 898 0 ft3
Volume provided
2 000 0 ft3
OK
Storage Volume SA Waters
8%
OK
15 runoff volume
ft3
OK
Pre - development 1 yr 24 hr runoff
ft3
Post - development 1 yr 24 hr runoff
ft3
OK
Minimum volume required
0 ft3
Volume provided
ft3
Parts I and 11 Design Summary Page 3 of 4
Cell Dimensions
Ponding depth of water
12 inches
OK
Ponding depth of water
1 00 ft
Surface area of the top of the bioretention cell
2 000 0 ft2
OK
Length
80 ft
OK
Width
25 ft
OK
-0r Radius
ft
Media and Sods Summary
Drawdown time ponded volume
12 hr
OK
Drawdown time to 24 Inches below surface
109 hr
OK
Drawdown time total
229 hr
In situ soil
Soil permeability
Unknown in/hr
OK
Planting media soil
Soil permeability
100 in /hr
OK
Soil composition
% Sand (by volume)
88%
OK
% Fines (by volume)
8%
OK
% Organic (by volume)
4%
OK
Total 100%
Phosphorus Index (P Index) of media
20 (unitless)
OK
Form SW401 Bioretention Rev 8
June 25 2010
Parts I and 11 Design Summary Page 3 of 4

Basin Elevations
Temporary pool elevation
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 elevation (top of the mulch or grass sod layer)
Depth of mulch
Bottom of the planting media soil
Planting media depth
Depth of washed sand below planting media soil
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
SHWT elevation
Distance from bottom to SHWT
Internal Water Storage Zone (IWS)
Does the design include IWS
Elevation of the top of the upturned elbow
Separation of IWS and Surface
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 distnbuted
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 31?
Is the BMP located in a proposed drainage easement with access
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
(81inches gravel followed by 3 5 ft of grass)
Grassed Swale
Forebay
Other
Form SW401 Bioretention Rev 8
June 25 2010
Permit Number
(to be provided by DWQ)
287 92 fmsl
Y (Y or N) OK
N (Y or N)
286 92 fmsl
0 inches Insufficient mulch depth unless installing grassed cell
284 92 fmsl
2 f
n .1.14.114 3 ft
Y (Y or N)
2 OK
10 OK
1 f
283 5866667 fmsl
282 00 fmsl
1586666667 ft Insufficient distance to SHWT
N (Y or N)
fmsl
286 92 It
0
0
1 Recommend more species
Y (Y or N) OK
Y (Y or N) OK
>aun
N (Y or N) Show how flow is evenly distnbuted
Y (Y or N)
OK
Y (Y or N)
OK
Y (Y or N)
OK
N (Y or N)
Insufficient ROW location
4 26 ft/sec
Insufficient Inlet velocity unless energy dissipating devices are
being used
N (Y or N)
OK
N (Y or N) OK
Y (Y or N) OK
X OK
Parts I and II Design Summary Page 4 of 4

Checklist Item 1. Site Plan (1 " =50')

Checklist Item 2. Bioretention Plan (1 " =30')

Checklist Item 3. Section Detail

Checklist Item 4. Soils Exploration

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. CDM 0 100 200 300 400 SGWASA WWTP
Smith Feet Figure 1. Stormwater Plan - SHWT Borings

Checklist Item 5. Bioretention Specification

BIORETENTION CELL
9003 1 Description
Bioretention cells are small landscaped or grassed basins intended to provide water quality management by
filtering stormwater runoff before release into storm drain systems or natural channels This work shall consist of
installing grassed bioretention cells as specified in the Contract Documents including all materials equipment
labor and services required to perform the work
9003 2 Materials
A Bioretention Soil Mixture The Bioretention Soil Mixture (BSM) is composed of the following materials
Item Composition By Volume Reference
Sand 88% ASTM C33 Fine Aggregate
Fines 81Y See below
Organic Compost V See below
The BSM shall be a uniform mix free of plant residue stones stumps roots or other similar objects larger
than two inches excluding mulch No other materials or substances shall be mixed or dumped within the
bioretention cell that may be harmful to plant growth or prove a hindrance to the planting or maintenance
operations The uniform soil mix shall hold a P index between 10 and 30 A P index of 20 is preferred All soil
media shall be tested and analyzed by the North Carolina Department of Agriculture before the media is
brought on site i
B Fines The fines used in the BSM and soil conditioned areas shall consist of equal parts silt and clay as
classified by the USDA Soil Textural Classification
C Organic Compost The compost used in the BSM and soil conditioned areas shall be derived from plant
material and the result of biological degradation and transformation of plant derived materials under
conditions that promote anaerobic decomposition The material shall be well composted free of viable weed
seeds and stabilized with regard to oxygen consumption and carbon dioxide generation The compost shall
have a moisture content that has no visible free water or dust produced when handling the material It shall
meet the criteria presented below as reported by the U S Composting Council STA Compost Technical Data
Sheet
Compost Criteria
One hundred percent of the material must pass through a
half inch screen
The pH of the material shall be between 6 and 8
Manufactured inert material (plastic concrete ceramics
metal etc shall be less than 101Y by weight
Organic matter should be between 35 and 65 /
Soluble salt content shall be less than 6 0 mmhos /cm
Maturity should be greater than 80 /
Stability shall be 7 or less
Carbon/nitrogen ratio shall be less than 25 1
Trace metal test result = pass
The compost must have a dry bulk density ranging from 40
to 50 Ibs /ft3
C Other Materials
Material
Bermuda Grass
Specification
See below
Washed #57 Stone
ASTM D448 See below
Filter Sand
See below
Geotextile Fabric
AASHTO M288

Two 4 inch HDPE Plastic Pipe
ASTM D3034
Underdrains
Water
See below
1 Bermuda Grass The grass seed used shall be 100% pure Bermuda grass seed free of foreign materials
and any artificially introduced chemical compounds that would be detrimental to plant or animal life
Additionally the grass seed shall be in good health free of disease and mold upon planting Grass shall be
planted and reseeded according to local nursery standards and in accordance with the North Carolina
BMP Manual Other vegetation or mulch shall not be used in place of or in addition to the Bermuda grass
species
2 Aggregate No 57 Aggregate shall be double washed to reduce suspended solids and potential for
clogging The aggregate shall be placed as shown in the Contract Drawings
3 Filter Sand Pure sand as defined by USDA Soil Textural Classification shall be double washed to reduce
suspended solids and potential for clogging The aggregate shall be placed as shown in the Contract
Drawings
4 Water Water used in the planting establishing or caring for vegetation shall be free from any substance
that is injurious to plant life
9003 3 Construction
The underdram or BSM shall not be placed until all contributing drainage areas are permanently stabilized
against erosion and sedimentation as shown on the Contract Plans and to the satisfaction of the Engineer Any
discharge of sediment that affects the performance of the cell will require reconstruction of the cell to restore its
defined performance No heavy equipment shall operate within the perimeter of a bioretention cell during
underdram placement backfillmg planting or mulching of the bioretention cell
A Excavation If the bioretention cell is to be used as a temporary sediment basin the bioretention cell
shall be excavated to the dimensions side slopes and 6 inches above the bottom of the BSM elevations
shown on the Contract Plans Any sediment from construction operations deposited in the bioretention
cell shall be completely removed from the cell after all vegetation including landscaping within the
drainage area of the bioretention cell has been established The excavation limits shall then be final
graded to the dimensions side slopes and final elevations shown on the Contract Plans Excavators and
backhoes operating on the ground adjacent to the bioretention cell shall be used to excavate the
bioretention cell if possible by low ground contact pressure equipment or if approved by the engineer
by excavators and /or backhoes operating on the ground adjacent to the bioretention cell Low
ground contact pressure equipment is preferred on bioretention cells to minimize disturbance to
established areas around perimeter of cell
Excavated materials shall be removed from the bioretention cell site Excavated materials shall be used
or disposed of in conformance with the project specifications
B Roto tilling After placing the underdram and aggregate and before the BSM the bottom of the
excavation shall be roto tilled to a minimum depth of 6 inches to alleviate any compaction of the cell
bottom Any substitute method for roto tilling must be approved by the Engineer prior to use Any
ponded water shall be removed from the bottom of the cell and the soil shall be friable before roto tilling
The roto tilling shall not be done where the soil supports the aggregate bed underneath the Underdram
for Bioretention (See Underdram for Bioretention specifications below)
C Underdram for bioretention The underdram system aggregate bed and geotextile fabric shall be
perforated and placed according to dimensions shown on the Contract Plans
D Observation wells / cleanouts of 4 inch non perforated HDPE pipe shall be placed vertically in the
bioretention cell as shown on the Contract Plans The wells /cleanouts shall be connected to the
perforated underdram with the appropriate manufactured connections as shown on the Contract Plans

The wells /cleanouts shall extend 8 inches above the top elevation of the bioretention cell grass and shall
be capped with a screw cap
E Placement of the BSM The BSM shall be placed and graded using low ground contact Pressure
ee uinment or if approved by the engineer by excavators and /or backhoes operating on the ground
adjacent to the bioretention cell Low ground contact pressure equipment is preferred on bioretention
cells to minimize disturbance to established areas around perimeter of cell No heavy equipment shall be
used within the perimeter of the bioretention cell before during, or after the placement of the BSM The
BSM shall be placed in horizontal lifts in depths not exceeding 12 inches for the entire area of the
bioretention cell The BSM shall be pre mixed with a moisture content low enough to prevent clumping
and compaction during placement If the BSM becomes contaminated during the construction of the cell
the contaminated material shall be removed and replaced with uncontaminated material at the
Contractor s expense Final grading of the BSM shall be performed after a 24 hour settling period Upon
final grading the surface of the BSM shall be roto tilled to a depth of 6 Final elevations shall be within 2
inches of elevations shown on the Contract Plans
F Soil Conditioning of Ponding Area Ensure there is no standing water within the ponding area prior to
beginning the soil conditioning process to avoid further compacting soils Existing vegetation including
turf shall be removed and the ground shall be tilled to a minimum depth of 6 inches A 3 inch deep layer
of specified compost shall be placed on top of the tilled ground and tilled into a depth of 6 inches of
existing soil Fine grading of the site shall be completed with a minimum number of equipment passes
(no more than two (2) passes) to reduce the potential for soil compaction Finalizing all preliminary
critical spot elevation slopes and positive drainage criteria for the site shall be completed as much as
possible prior to finish grading in order to ensure that equipment compaction is minimized after soil is
worked an amended Soil shall be firmed using one pass of a 50 pound roller if vegetative cover will be
seeded or plugged to help ensure successful plant establishment Vegetative cover shall be established
immediately after finish grading and erosion shall be prevented during establishment including but not
limited to installing erosion control blankets silt fence or straw waddles Vegetation may be sodded
seeded or plugged
H Plant Installation Trees shrubs and other plant materials specified for Bioretention Cells shall be
planted as specified in the Contract Plans and applicable landscaping standards with the exception
that pesticides herbicides and fertilizer shall not be applied during planting under any
circumstances Furthermore pesticides fertilizer and any other soil amendments shall not be applied
to the bioretention cell during landscape construction plant establishment or maintenance

Checklist Item 6. Construction Sequence

Section 3
Construction Schedule
Erosion and Sedimentation Control will be completed to address the construction of
the SGWASA WWTP Improvements The construction sequence will consist of the
following
1 Obtain erosion and sedimentation control permit approval and other
applicable permits
2 Hold preconstruction conference at least one week prior to starting
construction
3 Notify the permitting agency that approved the erosion and sedimentation
control plan of the date that construction will begin
4 Flag the lirriits of construction
5 Install rock pipe and rock doughnut mlet protection
6 Clear the minimum amount of area as necessary to install silt fence as shown
on the plans
7 Construct the level spreader install erosion control matting and grade to
dram the ponded area east of the equalization basins
8 Construct the perimeter berm and install channel with check dams as shown
on plan sheet C 5
9 Perform remainder of activities associated with the construction
10 Inspect all erosion and sediment control practices weekly and after rainfall
events Clean out sediment from behind rock check dams and around inlet
protection when the depth of sediment reaches half of the allotted depth
Needed repairs will be made immediately
11 After final grading is performed stabilize disturbed areas Once disturbed
areas are stabilized and with NCDENR approval only remove silt fence
temporary diversion berms and temporary down dram
12 Construct bioretention cells and
12 Permanent ground cover shall be established within 15 working days or 90
calendar days after final grade is reached whichever is shorter unless
temporary stabilization is applied
Smith
C St Seq w From ESC PI Sect 3 Sctt d I d
31

Checklist Item 7. Calculations

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Checklist Item 8. I &M Agreement

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 SGWASA WWTP Improvements
BAP drainage area number 2
Print name Lindsa L Mize, Executive Director
Title South Granville Water and Sewer Authority
Address 415 Central Avenue Suite B Butner NC 27509
Phone
Signati
Date ,l - /I — d-U / j-
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, ll �d/J �1.t2_Q.� , a Notary Public for the State of
r p County of 1-10Q12 ydkKJ do hereby certify that
QJYL.00o OI personally appeared before me this
day of o"-O IQ , and acknowledge the due execution of the
forgoing oreten on maintenance requirements Witness my hand and official seal,
C Mi�;g�m.
0
SEAL
My commission expires Z/ 4 / 12
Form SW401 Bioretenhon I &M Rev 2 Page 4 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 SGWASA WWTP Improvements
BMP drainage area number 1
Print name Lmdsav L Mize, Executive Director
Title South Granville Water and Sewer Authonty
Address 415 Central Avenue Suite B. Butner NC 27509
Phone [phone]
Signature
Date 7 J-�/ / ^ ?`D
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
UVJIUe , a Notary Public for the State of
`-A C. County of h nano al ) , do hereby certify that
dL!'� L personally appeared before me this I
day of 001 and acknowledge the due execution of the
forgoing bioretenh n maintenance requirements Witness my hand and official seal,
0,��• 0 MIFFF k
U
ti
aaeaaoa0164
SEAL
My commission expires 3 1 q 113
Form SW401 Bioretention I &M Rev 2 Page 4 of 4

Checklist Item 9. Proof of Ownership - Deed

(Page 1 of 8)
I IpY6 X11111111 N 191/111/
Doc ID 000084740006 Type CRP
Ft .0 d d 12/15/2008 at 12 36 00 P11
F:. lsetT 8358 0 Page 1 of 8
D a ills County NC
Kathryn Crewe Averett Rep of Deeds
sK 1185 PG283 290
P epared By G Mark Teague Ass stant Attom y 6 ne 1
9001 Mail Service Center Raleigh, NC 27699 9001
Grantee Address 211 West C St Burner NC 27509
STATE OF NORTH CAROLINA
NON WARRANTY DEED
OF WAKE
THI D D made as of the date set forth in the notary acknowledgement below by the
TE O N H CAROLINA a body politic and corporate hereinafter referred to as
ANT R o SOUTH GRANVILLE WATER AND SEWER AUTHORITY a water and
r au t Tit or ized under and by virtue of Article 1 of Chapter 162A of the North
inf a G eral St hereinafter referred to as GRANTEE
WITNESSETH
THAT VVII AS G eral�sembly of North Carolina enacted Session Law
2006 -159 Senate Bill 4 l (t a Act di ecteng a State of North Carolina to convey all right
title and interest in and t a] of the opert eal personal and mixed tangible and intangible
t,ompnsing the wdler and se n ((st desc, b i e�Act to Grantee and
WHEREAS this mstrumcht'is b ing ecut on behalf of the State of North
Carolina in furtherance of the Act
NOW THEREFORE in considerate f sum set forth in the Act the receipt of
which are hereby acknowledged the Grantor has argain add-sotd d bE
presents does
hereby bargain sell and convey unto the said Grant a�certa}rrt�ac or of land situate
lying and being in Granville County North Carolina, and ore =u icu bed as follows
SEE EXHIBIT A ATTACHED HERETO AND INCORPORATEHUE EAN BY
TO HAVF AND TO HOi D the aforesaid tract or parcel oflelijd
appurtenances thereunto belonging to the said Grantee in accordance wit tF
conveyance is made subject to Section 2 (d) of the Act which provides in
Grantee dissolve become insolvent or otherwise become unable to meet its
Book 1185 Page 283

(Page 2 of 8)
become due the tracts or parcels of land herein conveyed may revert to Grantor upon the
Grantor making the arrangements necessary to retire assume or otherwise satisfy any debt
issued by the Grantee to be outstanding following the reversion of the assets to the Grantor
provided however that if at such time the primary functions of the Grantor with respect to the
Butner Reservation (as that term is defined at N C G S ¢122C 3(3)) have been assumed by a
municipal corporation organized pursuant to the laws of the State of North Carolina the assets
that otherwise would revert to the State pursuant to this section shall vest in such municipality on
the same terms and conditions as if the assets were reverting to the Grantor (including that
arrangements necessary to retire assume or otherwise satisfy any debt issued by Grantee and to
be outstanding following the reversion of the assets to the Grantor be made as a condition to such
reversion)
Book 1185 Page 283

(Page 3 of 8)
IN TESTIMONY WHEREOF the State of North Carolina has caused this instrument
to be executed in its name by MICHAEL F EASLEY Governor attested by ELAINE F
MARSHALL Secretary of State and the Great Seal of the State of North Carolina hereunto
affixed by virtue of the power and authority aforesaid all as of the date set forth in the notary
acknowledgment below
STATE OF NORTH CAROLINA
B
se &t.t�
APPROVED AS TO F
ROY COOPER
Attorney General
Assistant Attorney 6eneraF
C O
Book 1185 Page 283

(Page 4 of 8)
STATE OF NORTH CAROLINA
COUNTY OF WAKE
I Anal( hAta ! a Notary Public for Jot ns-1 % County
North Carolina do certify that Secretary of State of the State of North
Carolina personally c,dme before me this day and acknowledged that �e isA, ecYetaryt -of State of
the State of North Carolina, and that by authority duly given and as the act of the State the
of North
was signed in its name by MICHAEL F EASLEY Governor of the State
scalcd with the Great Seal of the State of North Carolina and attested by
State
JENN BA.
Not. tary P. e
�onroton
rate of Norm carom
MV Commla)on UPM Nov
My commission expires I 1 el I
I have hereunto set my hand and Notarial Seal this the
2006
Notary Public v
��en nel t SatcQ hrrtan
Co �
L
Book 1185 Page 283

(Page 5 of 8)
EXHIBIT A
TRACT
Lying and being in the Graiville County North Carolina and being more particularly described
as follows
Being all of that certain tract or parcel of land containing 0 4890 acres more or less and labeled
Tract 1 Lake Holt Pump Station as shown on that certain plat recorded at Plat Book 34 Page
141 of the Granville County Registry and titled Survey For Public Acquisition South Granville
W r and Sewer Authority Dutchvtlle Township — Granville County Butner North Carolina,
J es �Sol ilson Professional I and Surveyor which survey is dated September 27 2006
There / i nveyed herewith a perpetual non exclusive easement of ingress and egress over
I across t t c am road labeled Lake Holt Access Road as shown on the above referenced
pl� /
FRS / �>
Lying an$ being n the G ville County North Carolina and being more particularly described
as follows
Being all of that tract arc 1 of I nd containing 0 0039 acres more or less and shown
belonging to the State o No aroI n and a led Tract 2 Stem Meter on that certain plat
recorded at Plat Book 34 age l41 the vi le County Registry and titled Survey For
Public Acquisition South Gramni a ater er thonty Dutchvtlle Township—
Granville Count Butner North arolina s 7"il n Professional Land Surve or which
Y Y survey is dated September 27 200 ----,
TRACT 3
Lying and being in the Granville County North lin eingg-inore particularly described
as follows
Being all of that certain tract or parcel of land containing 1 551 ere more r less and labeled
Tract 3 Water Treatment Plant as shown on that certain plat r d at P t Book 34 Page
142 of the Granville County Registry and titled Survey For Publ Acq sits S Granville
Water and Sewer Authority Dutchville Township — Granville Count B er C lina�
James R Wilson Professional Land Surveyor which survey is dated Sept mb07 2086 )
IA0045559 DOC)
Book 1185 P ge 283

(Page 6 of 8)
There is reserved by Grantor a non exclusive easement of ingress and egress thirty (30) feet in
length as shown on said plat and labeled 30 Access Easm it for the purposes of accessing the
Helipad as shown on said plat Grantor further reserves an easement for the use maintenance
repair and upkeep of said Helipad as shown on said plat
TRACT 4
Lying and being in the Granville County North Carolina and being more particularly described
as follows
Being all of that certain tract or parcel of land containing 113924 acres more or less and labeled
T! act 4 Raw Water Lagoon as shown on that certain plat recorded at Plat Book 34 Page 142 of
tho Griinville County Registry and titled Survey For Public Acquisition South Granville Water
,mfd Sewe Authority Dutchville Township—Granville County Butner North Carolina, James
R W# Con PSakssional Land Surveyor which survey is dated September 27 2006
Granville County North Carolina and being more particularly described
as touows / %
Being all of c ain act or parcel of land containing 1 1490 acres more or less and labeled
Tract 5 1942 atert as sho on that certain plat recorded at Plat Book 34 Page 142 of
the Granville C gis d ti ed ey For Public Acquisition South Granville Water
and Sewer Authority tchttly To ns i ville County Butner North Carolina, James
R Wilson Professional L dSurve whi su ey is dated September 27 2006
TRACT 6
Lying and being in the Granville �nty rth C b ng more particularly described
as follows ��\
Being all of that certain tract or parcel of land co inin 22 acres more or less and labeled
Tract 6 Wastewater Treatment Plant shown on th ce n l co ed t at Book 34 Pa e
144 of the Granville County Registry and titled Survey F r P bl A s ion outh Granville
Water and Sewer Authority Dutchville Township —Granv le utne North Carolina,
James R Wilson Professional Land Surveyor which survey is dat d epte r27 2006 2006
There is also conveyed herewith all of Grantor s right title and inte t i [trill erri nt it
Butner Sewer Treatment Plant containing 47 3523 acres more or less d allaf Gran r s ght
title and interest to and to the Existing 50 Easem t both of which are sho on th ce in
plat recorded at Plat Book 34 Page 144 of the Granville County Registry and t ed S ey F r
Book 1185 P ge 281

(Page 7 of 8)
Public Acquisition South Granville Water and Sewer Authority Dutchville Township —
Granville County Butner North Carolina James R Wilson Professional Land Surveyor which
survey is dated November 17 2006 For further reference see Quitclaim Deed and Perpetual
Flowage Easement from the State of North Carolina to the United States of America dated
September 28 1982 and recorded at Plat Book 239 Page 497 of the Granville County Registry
TRACT 7
Lying and being in the Granville County North Carolina and being more particularly described
as follows
all of that certain tract or parcel of land containing 0 1943 acres more or less and labeled
'T A Street Pump Station as shown on that certain plat recorded at Plat Book 34 Page
the Granville County Registry and titled Survey For Public Acquisition South Granville
And SMr Authority Dutchville Township— Granville County Butner North Carolina,
R Wil!sonT�rofessional Land Surveyor which survey is dated September 27 2006
Lying and mg in ville County North Carolina and being more particularly described
as tollow /�
Being all of thaf certai t t or p el of land containing 0 3296 acres more or less and labeled
Tract 8 33 d Street a rtan�'� o on certain plat recorded at Plat Book 34 Page 146 of
the Granville County R ist� at ed Su a For Public Acquisition South Granville Water
and Sewer Authority Du hv(ile To shi �ia ville County Butner North Carolina James
R Wilson Professional Lan rvey�r whi su ey is,4ated September 27 2006
TRACT 9
Lying and being in the Granville County
as follows
Being all of that certain tractor parcel of land contaix nt� 0226
belonging to the State of North Carolina and labeled Tra 9 F�
on that certain plat recorded at Plat Book 34 Page 146 of Gr
titled Survey For Public Acquisition South Granville Water
Township — Granville County Butner North Carolina, James R
Surveyor which survey is dated September 27 2006
ng more particularly descnbed
There also is conveyed herewith a perpetual non exclusive easement for in
for the installation maintenance and repair of water and sewer lines over and a
(A0045559 DOC )
and shown
ion as shown
;istry and
Dutchville
and
Book 1185 Page 283

(Page 8 of 8)
Grantor said easement labeled 30 Access and Utility Easement as shown on the above
referenced plat
TRACT 10
Lying and being in the Granville County North Carolina and being more particularly described
as follows
Being all of that certain tract or parcel of land containing 0 0486 acres more or less and labeled
Tract 1011" Street Pump Station as shown on that certain plat recorded at Plat Book 34 Page
143 of the Granville County Registry and titled Survey For Public Acquisition South Granville
Water and Sewer Authority Dutchville Township— Granville County Butner North Carolina,
J cslR, Wilson Prof cssional Land Survcyor which survey is dated September 27 2006
the Granville County North Carolina and being more particularly described
Being `ail oftfiat ce act or parcel of land containing 625 square feet more or less and
labeled Pump �ti n # 1 as shown on that certain plat recorded Map Book 9 Page 91 of the
Granville egist and titled Survey For N C Dept of Mental Health/Mental
Retardation Se ices "F�d��ep �ranville Co N C James R Wilson Registered Land
Surveyor which s y mbe 1983
TRACT 12
Lying and being in the Granville
as follows
Being all of that certain tract or parcel of lhnd co tainu
labeled Pump Station # 2 as shown on that m
Granville County Registry and titled Survey Por -- C
Retardation Services Dutchville Twsp -Granville
Surveyor which survey is dated September 17 1983
rd being more particularly described
i2 58 square feet more or less and
c rded Map Book 9 Page 92 of the
dip %i tal Health/Mental
J s W Registered Land
Book 1185 Page 283

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