20061900 Ver 1_More Info Received_20070103

•
Soil & Environmental Consultants, PA
11010 Raven Ridge Road Raleigh, North Carolina 27614 Phone: [phone] Fax: [phone]
www.SandEC.com
January 3, 2007
S&EC Project #10509.W1
• DWQ EXP Project #06-1900
Department of Environment and Natural Resources
Division of Water Quality
Attn: Cyndi Karoly/Lia Myott
2321 Crabtree Boulevard, Suite 250 p ~ ~ ~ ~~/]~ n
Raleigh, NC 27604 '+.,
Re: Reply to the Division of Water Quality's Request for More Information JAN ~ - Z(107
Pearl Creek Subdivision-EXPRESS REVIEW PROGRAM
Garner, Wake County, NC pENk - WtgT'~ti ':•ii,.a~~ •,
~1 ~7pRattiyAT~S ~HA~ut~P~
Dear Ms. Karoly and Ms. Myott:
The purpose of this letter is to respond to your Request for More Information letter dated December 29, 2006. The
original questions/requests are copied below as they appear within letter and are then followed by our response.
Additionally, although our total impervious post construction surface area is below the 30% threshold and our
project doesn't require a DWQ review of the stormwater management plan, it is a requirement of the City of Raleigh
therefore and we included this information for your file.
Additional Information Requested:
1. Operations and Maintenance Manual:
a. The Operations & Maintenance manual for the wet detention ponds and for the dry detention basins refers
multiple times to the fertilization of vegetation. Fertilization of BMP's in Nutrient Sensitive Waters is carefully
controlled. DWQ will allow aone-time application during establishment and another application if an area must be
replanted and/or reseeded. The one-time application of fertilizer should be the minimum amount required for
success. Please provide a revised Oc$M manual reflecting compliance with the above statements.
Attached are revised Operations & Maintenance manuals for the extended wetlands and the dry detention
basins, please note that all of the proposed BMP's are located outside of the Neuse River Basin Riparian
Areas.
2. Stub Road:
a. The street located along lots 64-66 (Pearl Road Extension) cannot be permitted as designed (i. e. no logical
terminus). Please resubmit your plans showing the road terminating into a cul-de-sac. IJthe Ciry of Raleigh
requires this road to be stubbed with the intentions of completing the road, a quantitative cumulative impact
analysis will be required.
Pearl Road Extension is a part of the City of Raleigh's Comprehensive Plan for the Southeast District. As
outlined in the PCN, Pearl Road Extension is to connect the existing Pearl Road through to Auburn Church
Road and is considered a proposed minor thoroughfare connection within the Southeast District (see attached
Arterials, Thoroughfares &Collectors-Southeast District Map). Because of this requirement from the City of
Raleigh, Pearl Road Extension is a part of our project.
The scope of our project includes a proposed single family residential development totaling 155 acres.
According to the Division of Water Quality (DWQ) Internal Policy for "Cumulative Impacts and the 401
Water Quality Certification and Isolated Wetland Permit Programs", Versions 1.6 and 2.1, Section III, which
reads in part, "Many private development projects are unlikely to cause cumulative impacts, including
projects such as urban in-fill, most residential subdivisions, and small commercial developments...".
Charlotte Office:
236 LePhillip Court, Suite C
Concord, NC 28025
Phone: [phone]
Fax: [phone]
Greensboro Office:
3817-E Lawndale Drive
Greensboro, NC 27455
Phone: [phone]
Fax: [phone]

Additionally, the DWQ policy lists some private development projects that could result in cumulative
impacts, projects such as 1) relatively large developments, 2) involving commercial development, and 3)
occurring in otherwise relatively undeveloped landscapes with an impact on regional growth patterns. None
of these criteria are identified in our project. Furthermore, below I have answered the necessary questions to
determine if a quantitative analysis should be required:
a) Is~2rowth likely to be induced by the proiect? It is unlikely that growth will be induced by this proposed project;
this project resides in the moderately developed landscape of Southeast Raleigh, also located with the City of
Raleigh's Extraterritorial Jurisdiction (ETJ). The proposed project is in a location which includes existing
residential development, commercial development, industrial development (i.e. Crosswinds Industrial Park) and is
also within the proposed I-540 beltline.
b) Are existine uses of the water likely to be impacted by the Qrowth? It is unlikely that the existing uses of the
water will be impacted by this project. The water quality classification for the proposed project is C; NSW. Class C
water quality standard are freshwaters protected for secondary recreation, fishing, aquatic life including propagation
and survival, and wildlife. The secondary classification is NSW-Nutrient Sensitive Waters; these are waters subject
to growths of microscopic or macroscopic vegetation requiring limitations on nutrient inputs. Because of the
location of this proposed project being in the Neuse River Basin along with the secondary NSW classification of
these waters, this project is subject to the Neuse River Basin Riparian Protection Rules (15A NCAC 02B .0233).
The Neuse River Basin Riparian Protection Rules require an additiona150' protected riparian area adjacent to all
intermittent and perennial streams within the project boundaries. These riparian areas stay intact and aid in nutrient
removal, filtering of pollutants and sediment, habitat for aquatic life and wildlife, thermal protection of fish and
wildlife in addition to stream bank stabilization. Additionally, this proposed project includes a stormwater
management plan which also increases the nutrient removal, sediment removal, pollutant removal and flood
protection capabilities.
c) Are additional reeulatorv measures needed? It is unlikely that additional regulatory measures should be needed.
This project is located within the City of Raleigh ETJ and the City requires a stormwater management plan that
encompasses the quality and quantity of stormwater runoff along with BMP maintenance. Additionally, the City
regulates a Sedimentation and Erosion Control Program that requires aland-disturbing permit for projects that
disturb greater than 12,000 square feet of land. And fmally, as outlined above, this project is located within the
Neuse River Basin which includes the Neuse River Basin Riparian Protection Rules protecting the existing 50'
riparian area adjacent to all intermittent and perennial streams within the project boundaries.
We anticipate that this answers all of the DWQ's questions in order to complete the fmal review process fora 401
Water Quality Certification. If you have any further questions or any additional explanation is needed, please don't
hesitate to call.
Sincerely,
Debbie Edwards
Environmental Specialist
CC:
Bill Hardin-Pearl Creek Partners, 5201 William & Mary Drive, Raleigh, NC 27616
Bill Daniels-Wm. G. Daniel & Assoc., 1150 SE Maynard Road, Suite 260, Cary, NC 27511
Attachments:
1) Arterials, Thoroughfares &Collectors-Southeast District Map
2) Stormwater Operations & Maintenance Manual (Wetlands #1, 2 &3)
3) Stormwater Operations & Maintenance Manual (Dry Detentions #4 & 5)

arG3 Ra~eigh Comorehenswe Plan Southeast D!strict Pian 5.7.A.

STORMWATER OPERATIONS AND MAINTENANCE MANUAL
(WETLANDS #1, #2, 8~ #3)
PEARL CREEK
STORMWATER CONTROL MEASURES
RALEIGH, NC
Owner:
TU BE OR NOT TU BE, LLC
D/B/A PEARL CREEK PARTNERS
P.O. BOX 97365
RALEIGH, NC 27624-7365
Prepared By:
William G. Daniel & Associates
1150 SE Maynard Road
Suite 260
Cary, NC 27511
JANUARY 02, 2007

STORMWATER OPERATIONS AND MAINTENANCE MANUAL
BACKGROUND
Pearl Creek is located southwest of the intersection of Rock Quarry Road (SR 2542}
and Pearl Road {SR 2550) . The project abuts the south side of Pearl Road. The
stormwater management plan for Pearl Creek employs three (3) constructed stormwater
wetlands and two (2) dry extended detention basins as the primary stormwater control
measures in achieving compliance with the City's requirements related to control of
rates of stormwater runoff and rates of nitrogen export. This stormwater control
measure is as depicted on preliminary drawings entitled "Pearl Creek" as prepared by
William G. Daniel & Associates, P.A. dated September 29, 2006 pursuant to preliminary
site plan approval for this project by the City of Raleigh (S-76-06). This manual is
intended to set forth guidelines and requirements associated with the proper
maintenance of the constructed stormwater wetlands.
Pearl Creek
Operations and Maintenance Manual P. 2 of 11

GENERAL INFORMATION
OPERATIONS 8~ MAINTENANCE MANUAL
Project: Pearl Creek (S-7fi-Ofi)
WATERSHED PROTECTION -CREATED WETLANDS #1, #2, 8~ #3
Raleigh, NC
Owners: Tu Be or Not Tu Be, LLC
D/B/A Pearl Creek Partners
Address: P.O. BOX 97365
RALEIGH, NC 27624-7365
Owner Agent: William G. Daniel & Associates. P.A.
(attn: William G. Daniel)
Address: 1150 S.E. Maynard Road, Suite 260
Cary, NC 27511
Phone #: [phone]
Prepared by: William G. Daniel 8~ Associates, P.A.
Date: December 12, 2006
Project: Pearl Creek (Sudbdivision)
Date Constructed: Proposed Spring of 2007
Location: SW of intersection of Rock Quarry Road and Pearl Road.
Receiving Water Course: Neuse River
Contractor: {List below}
Landscape Contractor Wayne L. Adams, Inc,
Grading Contractor Wayne L. Adams, Inc.
Pearl Creek
Operations and Maintenance Manual P. 3 of 11

OPERATIONS AND MAINTENANCE MANUAL
PEARL CREEK WATERSHED PROTECTION CREATED WETLANDS
This manual establishes procedures for maintenance and operation of the PEARL
CREEK created wetlands areas in accordance with Part 10, Section 9 of the City of
Raleigh Municipal Code.
I. MAINTENANCE OF CREATED WETLANDS AREAS
Vegetation-The areas above the elevation of the normal pool are to be vegetatively
stabilized with a ground cover of fescue, which if properly maintained will prevent
erosion of the embankment and provide serviceable access for maintenance and
inspection. Grass should be fertilized as a single application in conjunction with the
initial seedbed preparation. The application shall be limited to the minimum amount
required to establish full coverage of viable grass.
Re-Seeding-Periodic re-seeding may be required to establish grass on areas where
seed did not take or have been destroyed. As part of the reseeding process, fertilizer
(12-12-12) should be applied, if needed, as a single application in conjunction with the
seedbed preparation. The application shall be limited to the minimum amount required
to establish full coverage of viable grass. The seed should be covered with soil to the
depth of approximately '/4'. Immediately following the planting, the area should be
mulched with straw.
Trees and Shrubs-Trees, shrubs and other landscape vegetation should be permitted
only as shown on the approved planting plan. The vegetation should be kept healthy
and vibrant. If a tree or shrub dies it should be removed and replaced with another tree
or shrub from the same species (see attached maintenance schedule and Plant List
included in the Appendix fo this manual},
Mowing-Grass mowing, brush cutting and removal of weed vegetation will be
necessary for the proper maintenance of the areas. All area slopes and vegetation
should be mowed when the grass exceeds 8" in height, Acceptable methods include
the use of weed whips or power brush cutters and mowers.
Erosion-Erosion occurs when the water concentrates causing failure of the vegetation
or when vegetation dies and sets up the environment for rill erosion and eventually
gullies from the stormwater runoff. The areas should be inspected. Proper care of
vegetative areas that develop erosion is required to prevent more serious damage to
the site. Rills and gullies should be filled with suitable soil compacted and then seeded.
Methods described earlier on vegetation should be used to properly establish the grass
surface. Where eroded areas are detected, the cause of the erosion should be
addressed to prevent a continued maintenance problem. Frequently, problems result
from the concentration of runoff to one point of the created wetland instead of a uniform
Pearl Creek
Operations and Maintenance Manual P. 4 of 11

distribution of runoff. This can be corrected by reshaping, to more evenly distribute the
runoff to areas not experiencing erosion problems.
Rodent Control-Generally in this urban environment, rodents are not a problem.
Rodents such as groundhogs, muskrats and moles are attracted to moist, wet areas
and can be quite dangerous to structural integrity and proper performance of the
earthwork and drainage. Groundhogs and muskrats thrive on burrowing into the
manmade earthwork, which become pathways for seepage. In the event that burrows
are detected within the wetland area, the rodents should be dealt with by removal.
Trash and Debris--Trash acts as a barrier to stormwater infiltration and attracts
unwanted pests. The wetland area should be kept clear of debris such as loose bottles,
cans, food containers and other farms of rubbish. The area should be cleared of debris
as needed, but no less than twice a year.
II MAINTENANCE OF SPILLWAYS AND CONTROL STRUCTURE
Inspection of Conduits--Conduits should be inspected thoroughly once a year. Conduits
should be visually inspected at the joints. Pipes should be inspected for proper
alignment (sagging), elongation and displacement at joints, cracks, leaks, surface wear,
loss of protective coating, corrosion and blocking. Problems with conduits most often
occur at joints and special attention should be given to them during inspection. Joints
should be checked for gaps caused by elongation or settlement and loss of joint filler
material. Open joints can permit erosion of the earthwork and possibly the piping of soil
material through the joints. A depression in the soil surface over the pipe may be signs
that soi( is being removed from around the pipe.
III OPERATION
Drainpipes--Drainpipes should always be operable so that the water can be drawn down
in the event of severe rain or for repairs or maintenance.
Record Keeping--Operation of created wetland areas should include recording of the
following:
Annual Inspection Reports -The stormwater Control Measures (as defined in
the stormwater Replacement Protection Easement and Access Maintenance
Agreement and Installment Replacement Contribution among Tu Be or Not Tu
Be, LLC, and the City of Raleigh) shall be thoroughly inspected once a year in
accordance with Part 10, Chapter 9, Section 10-9028 of the Raleigh City Code
(or any successor provision). The inspection report, a sample of which is
included in Section IV of this Manual, must be submitted to the Public Works
Department, stormwater Management Division of the City of Raleigh (the "City")
from a qualified, registered North Carolina professional engineer, surveyor, or
Pearl Creek
Operations and Maintenance Manual P. 5 of 11

landscape architect and shall be in the form proscribed by the Raleigh City Code
and provided by the City.
Inspection Reports -the Owner shall maintain copies of annual inspection
reports in its records.
Observations--All observations should be recorded. Where periodic inspections
are performed following significant rainfall, these inspections should be logged
into the Periodic Inspection, Operations and Maintenance Fvrm appended to this
manual.
Maintenance--Written records of maintenance and/or repairs should be recorded
on the Periodic Inspection, Operation and Maintenance Form appended to this
manual.
Other Operational Procedures--The owner should maintain a complete and up-to-date
set of plans (as-built drawings) and all changes made to the created wetland area over
time should be recorded on the as-builts.
Sedimentation and Dredging--Sedimentation from on-site and off-site soils will
eventually result in the clogging of drainage conduits and will have to be removed. The
frequency of this sediment removal can be reduced by ensuring that the site areas
around the building be stabilized with a vegetative ground cover such that it restrains
erosion. This would include periodic treatments necessary to promote a stable ground
cover and minimize sedimentation to the pond. The removed material should be hauled
offsite to a suitable landfill site or mounded somewhere on site and stabilized with a
ground cover sufficient to restrain erosion.
Example Maintenance Schedule for Created Wetland Areas
Descri lion Method Fre uenc Time of ear
SOIL
Ins ect and re air erosion Visual Monthl All ear
ORGANIC LAYER
Remulch an void area B hand As needed As needed
Remove previous mulch
layer before applying new
la er o tional By hand Once every
2-3 years Spring
An additional mulch added B hand Once a ear S rin
PLANTS
Removal and replacement
of all dead and diseased
ve elation considered See planting
specifications Twice a year As directed by
landscaper
Pearl Creek
Operations and Maintenance Manual P. 6 of 11

be and treatment
Treat all diseased trees Mechanical N/A Varies, dependent
and shrubs or by hand on insect or disease
infestation
Watering of plant material By hand Daily Immediately after
shall take place at the end completion of project
of each day for fourteen
consecutive days and after
lantin is com leted
Replacement of support By hand Once a year Only remove stake
stakes in the s rin
Replace any deficient By hand As needed As needed
stakes or wires
For specific list of plants approved for use within the created wetlands, see Wetlands
Plant List included in Section V of this manual.
Pearl Creek
Operations and Maintenance Manual P. 7 of 11

IV. INSPECTION, OPERATION & MAINTENANCE CHECKLISTS
WETLANDS INSPECTION CHECKLIST
Date: Inspected by:
Time: Signature
Registration
P.E. ^ R.L.S. ^ L.A.R. ^
Pearl Creek: Neuse River Watershed Protection BMP, Raleigh, NC
SPILLWAYS -DRAINS -OUTLETS
Check/Circle
Condition Noted Observations Action -
Re air Action -
Monitor Action -
Investi alive
Outlet
Structure Type:
Debris
Cracks/Deterioration
Joint Deterioration
Improper Alignment
Cracks/Deterioration
Joint Deterioration
Seepage/Piping
Undercutting
Erosion
Debris
Drain/Other
Outlets Type:
GatesNalves
O erabili

General Comments, Sketches & f=ield Measurements
Pearl Creek
Operations and Maintenance Manual P. 8 of t 1

WETLANDS INSPECTION CHECKLIST
Date: Inspected by:
Time: Signature
Registration P.E. ^ R.L.S. 0 L.A.R. ~-
Pearl Creek: Neuse River Watershed Protection BMP, Raleigh, NC
EMBANKMENT -- POOL
Check/Circle Condition
Noted observations Action -
Re air Action -
Monitor Action --
Investi ative
U S Slo e T e:
Vegetation/Riprap
Beach ing/slides/cracks
Undermining/erosion
Rodent burrows
Area Adjacent to
Perimeter Walls Type:
Ruts/erosion
Cracks/settlement
D S Slo e T e:
Ve etation/erosion
Rodent burrows
Slou hs/slides/cracks
See a e/wetness
Pool T e:
Erosion/ round cover
Sedimentation
Water uali
Abutment T e•
Ve etation/erosion
Slou h/slides/cracks
See a elwetness
General Comments, Sketches & Field Measurements
Pearl Creek
Operations and Maintenance Manual P. 9 of 11

PERIODIC INSPECTION, OPERATION & MAINTENANCE RECORDS
Date:
Time:
Inspected by:
Signature
Registration P.E. ^ R.L.S. ^
L.A.R. ^
Pearl Creek: Neuse River Watershed Protection BMP, Raleigh, NC
I Date Time Rain " Pool Level Weather General Observations Recorded By
l Conditions or Comments
Date
Date
Maintenance Performed i Comments I Recorded
Equipment Operated ~ Commen#s ~ Recorded
Pearl Creek
Operations and Maintenance Manual P. 10 Of 11

V. WETLANDS PLANT LIST
The following table contains a list of plants specified for the stormwater wetlands as
shown on the approved stormwater management plan for Pearl Creek. If in the course
of routine maintenance it comes necessary to replace diseased or dead plants,
replacements should be made from the same plat species. In the event that the owner
of the wetlands elects to modify the makeup of the planting within the wetlands from that
depicted on the following list, such changes may be implemented only after having a
planting plan representing the proposed changes prepared by a landscape architect or
other person with specific expertise in wetlands planting and maintenance; submitting
such plan to the City of Raleigh Conservation Department for review and approval; and
receipt of written approval from the City of Raleigh Conservation for the proposed
changes.
Approved Plant List for Created stormwater Wetlands
Species Type Location (Depth of Water) Total #
Carex SP Sedges 0-3" 750
Juncus Effusus Soft Rush 0-6" 1750
Saururus Cemuus Lizard's Tail 0-12" 716
Peltandra Virginica Arrow Arum 0-12" 716
Pontederia Cordata Pickerelweed 0-12" 716
VI. MAJOR REPAIR
Major repairs of a stormwater control measure are those that would result in a cost
equal to or exceeding one third of the cost of initial construction. Such major repairs are
anticipated to occur very infrequently. Examples of major repair could include
breaching of the wetlands dam due to extremely large rainfall events such as those
associated with hurricanes, unanticipated structural problems resulting in settlement or
sliding of the embankment material or displacement of the outlet structure, or the need
to replace over one third of the wetlands vegetation.
Pearl Creek
Operations and Maintenance Manual P. 11 Of 11

STORMWATER OPERATIONS AND MAINTENANCE MANUAL
{DRY DETENTION BASINS #4, #S)
PEARL CREEK
STORMWATER CONTROL MEASURES
RALEIGH, NC
Owner:
TU BE OR NOT TU BE, LLC
D/B/A PEARL CREEK PARTNERS
P.O. BOX 97365
RALEIGH, NC 27624-73fi5
Prepared By:
William G. Daniel & Associates
1150 SE Maynard Road
Suite 260
Cary, NC 27511
JANUARY 02, 2007

STORMWATER OPERATIONS AND MAINTENANCE MANUAL
BACKGROUND
Pearl Creek is located southwest of the intersection of Rock Quarry Road (SR 2542)
and Pearl Road (SR 2550) . The project abuts the south side of Pearl Road. The
stormwater management plan for Pearl Creek employs three (3) constructed stormwater
wetlands and two (2) dry extended detention basins as the primary stormwater control
measures in achieving compliance with the City's requirements related to control of
rates of stormwater runoff and rates of nitrogen export. This stormwater control
measure is as depicted on preliminary drawings entitled "Pearl Creek" as prepared by
William G. Daniel & Associates, P.A. dated September 29, 2006 pursuant to preliminary
site plan approval for this project by the City of Raleigh (S-76-06). This manual is
intended to set forth guidelines and requirements associated with the proper
maintenance of the proposed dry detention basins.
Pearl Creek
Operations and Maintenance Manual (Dry Detention) P. 2 of 11

GENERAL INFORMATION
OPERATIONS & MAINTENANCE MANUAL
Project: Pearl Creek (S-76-06)
WATERSHED PROTECTION -Dry Detention Basins #1, #2
Raleigh, NC
Owners: Tu Be or Not Tu Be. LLC
D/B/A Pearl Creek Partners
Address: P.O. BOX 97365
RALEIGH, NC 27624-7365
Owner Agent: William G. Daniel & Associates. P.A.
{attn: William G. Daniei)
Address: 1150 S.E. Maynard Road, Suite 260
Cary, NC 27511
Phone #: [phone]
Prepared by: William G. Daniel & Associates, P.A.
Date: December 12, 2006
Project: Pearl Creek (Sudbdivision)
Date Constructed: Proposed Spring of 2007
Location: SW of intersection of Rock Quarry Road and Pearl Road.
Receiving Water Course: Neuse River
Contractor: (List below)
Landscape Contractor Wayne L. Adams, Inc.
Grading Contractor Wayne L. Adams, Inc.
Pearl Creek
Operations and Maintenance Manual (Dry Detention} P. 3 Of 11

OPERATIONS AND MAINTENANCE MANUAL
PEARL CREEK WATERSHED PROTECTION DRY DETENTION BASINS
This manual establishes procedures for maintenance and operation of the PEARL
CREEK dry detention basins in accordance with Part 10, Section 9 of the City of
Raleigh Municipal Code.
I. MAINTENANCE OF DRY DETENTION BASINS
Vegetation-The areas comprising the basins will be vegetatively stabilized with a
ground cover of fescue, which if properly maintained will prevent erosion of the
embankment and provide serviceable access for maintenance and inspection. Grass
should be fertilized as a single application in conjunction with the initial seedbed
preparation. The application shall be limited to the minimum amount required to
establish full coverage of viable grass.
Re-Seeding-Periodic re-seeding may be required to establish grass on areas where
seed did not take or have been destroyed. As part of the reseeding process, fertilizer
(12-12-12) should be applied, if needed, as a single application in conjunction with the
seedbed preparation. The application shall be limited to the minimum amount required
to establish full coverage of viable grass. The seed should be evenly sown at a rate of
three pounds per 1,000 SF. The seed should be covered with soil to the depth of
approximately'/4". Immediately following the planting, the area should be mulched with
straw.
Trees and Shrubs-Trees, shrubs and other landscape vegetation should be permitted
only as shown on the approved planting plan. The vegetation should be kept healthy
and vibrant. If a tree or shrub dies it should be removed and replaced with another tree
or shrub from the same species (as specified in the approved landscape plan for Pearl
Creek).
Mowing-Grass mowing, brush cutting and removal of weed vegetation will be
necessary far the proper maintenance of the areas. All area slopes and vegetation
should be mowed when the grass exceeds 8" in height. Acceptable methods include
the use of weed whips or power brush cutters and mowers.
Erosion-Erosion occurs when the water concentrates causing failure of the vegetation
or when vegetation dies and sets up the environment for rill erosion and eventually
gullies from the stormwater runoff. The areas should be inspected. Proper care of
vegetative areas that develop erosion is required to prevent more serious damage to
the site. Rills and gullies should be filled with suitable soil compacted and then seeded.
Methods described earlier on vegetation should be used to properly establish the grass
surface. Where eroded areas are detected, the cause of the erosion should be
addressed to prevent a continued maintenance problem. Frequently, problems result
Pearl Creek
Operations and Maintenance Manual (Dry Detention) P. 4 of 11

from the concentration of runoff to one point of the dry detention basin instead of a
uniform distribution of runoff. This can be corrected by reshaping, to more evenly
distribute the runoff to areas not experiencing erosion problems.
Rodent Control-Generally in this urban environment, rodents are not a problem.
Rodents such as groundhogs, muskrats and moles are attracted to moist, wet areas
and can be quite dangerous to structural integrity and proper performance of the
earthwork and drainage. Groundhogs and muskrats thrive on burrowing into the
manmade earthwork, which become pathways for seepage. In the event that burrows
are detected within the dry detention area, the rodents should be dealt with by removal.
Trash and Debris--Trash acts as a barrier to stormwater infiltration and attracts
unwanted pests. The detention area should be kept clear of debris such as loose
bottles, cans, food containers and other forms of rubbish. The area should be cleared
of debris as needed, but no less than twice a year.
II MAINTENANCE OF SPILLWAYS AND CONTROL STRUCTURE
Inspection of Conduits--Conduits should be inspected thoroughly once a year. Conduits
should be visually inspected at the joints. Pipes should be inspected for proper
alignment (sagging), elongation and displacement at joints, cracks, leaks, surface wear,
loss of protective coating, corrosion and blocking. Problems with conduits most often
occur at joints and special attention should be given to them during inspection. Joints
should be checked for gaps caused by elongation or settlement and loss of joint filler
material. Open joints can permit erosion of the earthwork and possibly the piping of soii
material through the joints. A depression in the soil surface over the pipe may be signs
that soil is being removed from around the pipe.
III OPERATION
Drainpipes--Drainpipes should always be operable so that the water can be drawn down
in the event of severe rain or for repairs or maintenance.
Record Keeping--Operation of dry detention basins should include recording of the
following:
Annual Inspection Reports -The stormwater Control Measures (as defined in
the stormwater Replacement Protection Easement and Access Maintenance
Agreement and Installment Replacement Contribution among Tu Be or Not Tu
Be, LLC, and the City of Raleigh) shall be thoroughly inspected once a year in
accordance with Part 10, Chapter 9, Section 10-9028 of the Raleigh City Code
(or any successor provision). The inspection report, a sample of which is
included in Section IV of this Manual, must be submitted to the Public Works
Department, stormwater Management Division of the City of Raleigh (the "City")
from a qualified, registered North Carolina professional engineer, surveyor, or
Pearl Creek
Operations and Maintenance Manual (Ory Detention) P. 5 of 11

landscape architect and shall be in the form proscribed by the Raleigh City Code
and provided by the City.
Inspection Reports -the Owner shall maintain copies of annual inspection
reports in its records.
Observations--All observations should be recorded. Where periodic inspections
are performed following significant rainfall, these inspections should be logged
into the Periodic Inspection, Operations and Maintenance Form appended to this
manual.
Maintenance--Written records of maintenance and/or repairs should be recorded
on the Periodic Inspection, Operation and Maintenance Form appended to this
manual.
Other Operational Procedures--The owner should maintain a complete and up-to-date
set of plans (as-built drawings) and all changes made to the dry detention basins over
time should be recorded on the as-builts.
Sedimentation and Dredging--Sedimentation from an-site and off-site soils will
eventually result in the clogging of drainage conduits and will have to be removed. The
frequency of this sediment removal can be reduced by ensuring that the site areas
around the building be stabilized with a vegetative ground cover such that it restrains
erosion. This would include periodic treatments necessary to promote a stable ground
cover and minimize sedimentation to the pond. The removed material should be hauled
offsite to a suitable landfill site or mounded somewhere on site and stabilized with a
ground cover sufficient to restrain erosion.
Example Maintenance Schedule for Dry Detention Basins
Descri tion Method Fre uenc Time of ear
SOIL
Ins ect and re air erosion Visual Month/ All ear
ORGANIC LAYER
Remulch an void area B hand As needed As needed
Remove previous mulch
layer before applying new
la er o tional By hand Once every
2-3 years Spring
An additional mulch added B hand Once a ear S rin
PLANTS
Removal and replacement
of all dead and diseased
ve etation considered See planting
specifications Twice a year As directed by
landscaper
Pearl Creek
Operations and Maintenance Manual (Dry Detention) P. 6 Of 11

be and treatment
Treat all diseased trees Mechanical NIA Varies, dependent
and shrubs or by hand on insect or disease
infestation
Watering of plant material By hand Daily Immediately after
shall take place at the end completion of project
of each day for fourteen
consecutive days after
lantin is com leted
Replacement of support By hand Once a year Only remove stake
stakes in the s rin
Replace any deficient By hand As needed As needed
stakes or wires
Only those plants as specified in the approved landscape plan for Pearl Creek shall be
allowed within the limits of the dry detention areas.
Pearl Creek
Operations and Maintenance Manual (Dry Detention) P. 7 Of 11

IV. INSPECTION, OPERATION & MAINTENANCE CHECKLISTS
DRY DETENTION INSPECTION CHECKLIST
Date: Inspected by:
Time: Signature
Registration P.E. ^ R.L.S. ^ L.A.R. ^
Pearl Creek: Neese River Watershed Protection BMP, Raleigh, NC
SPILLWAYS -DRAINS -OUTLETS
Check/Circle
Condition Noted Observations Action -
Re air Action -
Monitor Action -
Investi ative
Outlet
Structure Type:
Debris
CrackslDeterioration
Joint Deterioration
Improper Alignment
CrackslDeterioration
Joint Deterioration
Seepage/Piping
Undercutting
Erosion
Debris
Drain/Other
Outlets Type:
GatesNalves
O erabili

General Comments, Sketches & Field Measurements
Pearl Creek
Operations and Maintenance Manual (Dry Detention) P. 8 of 11

DRY DETENTION INSPECTION CHECKLIST
Date: Inspected by:
Time: Signature
Registration P.E. ^ R.L.S. ^ L.A.R. G
Pearl Creek: Neuse River Watershed Protection BMP, Raleigh, NC
TEMPORARY POOL AREA
Check/Circle Condition
Noted Observations Action -
Re air Action -
Monitor Action --
Investi ative
U S Slo e T e:
Vegetation/Riprap
Beaching/slides/cracks
Undermining/erosion
Rodent burrows
Perimeter Sloe T e:
Ruts/erosion
Cracks/settlement
D/S Sloe T e:
Ve etation/erosion
Rodent burrows
Slou hs/slides/cracks
See a e/wetness
Detention Area T e:
Erosion/ round cover
Sedimentation
Water uali
Abutment T e:
Ve etation/erosion
Slou h/slides/cracks
See a e/wetness
General Comments, Sketches & Field Measurements
Pearl Creek
Operations and Maintenance Manual (Dry Detention) P. 9 Of 11

PERIODIC INSPECTION, OPERATION & MAINTENANCE RECORDS
Date:
Time:
Inspected by:
Signature
Registration P.E. ^ R.L.S. ~-
L.A.R. ^
Pearl Creek: Neuse River Watershed Protection BMP, Raleigh, NC
Date Time Rain " Pool Level Weather General Observations Recorded By
Conditions ar Comments
Date
Date
Maintenance Performed I Comments I Recorded
Equipment Operated ~ Comments ~ Recorded
Pearl Creek
Operations and Maintenance Manual (Dry Detentiony P. 10 of 11

V. DRY DETENTION AREA LANDSCAPING
The areas comprising the dry detention areas shall be initially stabilized by
establishment of fescue sod-either through seeding & mulching or placement of sod.
Landscaping within the dry detention areas may be augmented in accordance with duly
approved landscaping plans prepared by a landscape architect or other person with
specific expertise in landscaping and maintenance.
VI. MAJOR REPAIR
Major repairs of a stormwater control measure are those that would result in a cost .
equal to or exceeding one third of the cost of initial construction. Such major repairs are
anticipated to occur very infrequently. Examples of major repair could include
breaching of the detention basin berm due to extremely large rainfall events such as
those associated with hurricanes, unanticipated structural problems resulting in
settlement or sliding of the embankment material or displacement of the outlet structure.
Pearl Creek
Operations and Maintenance Manual (Dry Detention) P. 11 Of 11