20052070 Ver 1_More Info Received_20060214 (2)

Soil & Environmental Consultants, PA
11010 Raven Ridge Road • Raleigh, North Carolina 27614 • Phone: [phone] • Fax: [phone]
www.SandEC.com
February 14, 2006
S&EC Project # 8713.W1
Department of Environment and Natural Resources
Division of Water Quality
Attn: Cyndi Karoly
2321 Crabtree Boulevard
Suite 250
Raleigh, NC 27604
Re: Reply to the Division of Water Quality's Request for More Information '
Weavers Pond Subdivision, DWQ # 05-2070 FFg l 4 20016
Zebulon, Wake County, NC
DEER-V('AlERQWi L-TY
Dear Ms. Karoly: WEl't,AM04 &N9 STORMWATER BRANCH
The purpose of this letter is to respond to your November 22, 2005 letter requesting further information.
The original questions/requests are copied below as they appear on the 11/22/05 letter and are then
followed by our response to each.
Additional Information Requested:
Please indicate all stormwater outfalls on the site plan.
An overall stormwater site plan map is attached for your review. This site plan map includes all
stormwater outfalls proposed within the previously applied for Weavers Pond Subdivision.
2. Please indicate the diffuse flow provision measures on the site plan.
A stormwater plan with an overall stormwater plan map that provides diffuse flow is attached for you
review. This stormwater plan includes dry detention basins followed by level spreaders, timber weir wall
level spreaders and pre-formed scour holes all designed to meet the diffuse flow requirements. In
addition, level spreader worksheets, dry detention worksheets and 2 Operations & Maintenance
Agreements for level spreaders and dry detention basins are included.
3. ?ate road crossing labeled as "Road D-Crossing #3 " on the plans does not appear to be
necessary. Please eliminate the road crossings or provide additional information as to why
it is necessary for this project.
As stated within the Pre-Construction Notification Application, this road crossing is needed for internal
connectivity, to insure safety due to the number of lots served and to accommodate future development to
the northern portion of the property. As such, the applicant is now proposing to cross this feature with a
bottomless culvert and completely spanning both banks to avoid all stream impacts. In the original
application, USACE Stream Quality Assessment Worksheets and DWQ Stream Identification Forms
were completed and submitted, along with photo's of this. unimportant, intermittent stream to emphasize
Charlotte Office:
236 LePhillip Court, Suite C
Concord, NC 28025
Phone: [phone]
Fax: [phone]
Greensboro Office:
3817-E Lawniale Drive
Greensboro, NC 27455
Phone: [phone]
Fax: [phone]
the low quality of this agricultural feature and its existing riparian buffer. Attached are new impact maps
for Road D-Crossing #3 and photo's of the existing riparian buffer.
We hope that this answers all of the DWQ's questions in order to finish the final review process for a
401 Water Quality Certification. If you have any further questions or any additional explanation is
needed, please don't hesitate to call.
Sincerely,
0, -- /? -
Aaron Cooper
Environmental Scientist
Attachments:
1) Overall Stormwater Site Plan, sheets 1-6 (5 copies)
2) Overall Stormwater Site Plan, aerial photo (5 copies)
3) Stormwater and Erosion Control Calculations binder (includes level spreader & dry detention
worksheets) (5 copies)
4) Level Spreader Operations & Maintenance Agreement, signed and sealed (5 copies)
5) Dry Detention Operations & Maintenance Agreement, signed and sealed (5 copies)
6) Revised Road D-Crossing #3 Impact Map & Vertical Cross-section
7) Photo's of stream and impact area for proposed Road D-Crossing #3 (5 copies)
8) Revised pages 3, 4, 5 & 8 of the PCN (5 copies)
CC: Michael Whitehead-MacGregor Development Co., 201 Shannon Oaks Circle, Cary, NC 27511
2
Soil & Environmental Consultants, PA
11010 Raven Ridge Road • Raleigh, North Carolina 27614 • Phone: [phone] • Fax: [phone]
www.SandEC.com
February 14, 2006
S&EC Project # 8713.W1
Department of Environment and Natural Resources
Division of Water Quality
Attn: Cyndi Karoly
2321 Crabtree Boulevard
Suite 250
Raleigh, NC 27604
f -!H
0
Re: Reply to the Division of Water Quality's Request for More Information
Weavers Pond Subdivision, DWQ # 05-2070 FF9 1 4 7006
Zebulon, Wake County, NC
DENA - WAIER QUA n
Dear Ms. Karoly: WET111N?WAND1?TARM -96RANCH
The purpose of this letter is to respond to your November 22, 2005 letter requesting further information.
The original questions/requests are copied below as they appear on the 11/22/05 letter and are then
followed by our response to each.
Additional Information Requested.
1. Please indicate all stormwater outfalls on the site plan.
An overall stormwater site plan map is attached for your review. This site plan map includes all
stormwater outfalls proposed within the previously applied for Weavers Pond Subdivision.
2. Please indicate the diffuse flow provision measures on the site plan.
A stormwater plan with an overall stormwater plan map that provides diffuse flow is attached for you
review. This stormwater plan includes dry detention basins followed by level spreaders, timber weir wall
level spreaders and pre-formed scour holes all designed to meet the diffuse flow requirements. In
addition, level spreader worksheets, dry detention worksheets and 2 Operations & Maintenance
Agreements for level spreaders and dry detention basins are included.
3. The road crossing labeled as "Road D-Crossing #3 " on the plans does not appear to be
necessary. Please eliminate the road crossings or provide additional information as to why
it is necessary for this project.
As stated within the Pre-Construction Notification Application, this road crossing is needed for internal
connectivity, to insure safety due to the number of lots served and to accommodate future development to
the northern portion of the property. As such, the applicant is now proposing to cross this feature with a
bottomless culvert and completely spanning both banks to avoid all stream impacts. In the original
application, USACE Stream Quality Assessment Worksheets and DWQ Stream Identification Forms
were completed and submitted, along with photo's of this. unimportant, intermittent stream to emphasize
Charlotte Office:
236 LePhillip Court, Suite C
Concord, NC 28025
Phone: [phone]
FAX- OW) 79n_9406
Greensboro Office:
3817-E Lawniale Drive
Greensboro, NC 27455
Phone: [phone]
Fax- [phone]
the low quality of this agricultural feature and its existing riparian buffer. Attached are new impact maps
for Road D-Crossing #3 and photo's of the existing riparian buffer.
We hope that this answers all of the DWQ's questions in order to finish the final review process for a
401 Water Quality Certification. If you have any further questions or any additional explanation is
needed, please don't hesitate to call.
Sincerely,
/ 4e-
C&,
Aaron Cooper
Environmental Scientist
Attachments:
1) Overall Stormwater Site Plan, sheets 1-6 (5 copies)
2) Overall Stormwater Site Plan, aerial photo (5 copies)
3) Stormwater and Erosion Control Calculations binder (includes level spreader & dry detention
worksheets) (5 copies)
4) Level Spreader Operations & Maintenance Agreement, signed and sealed (5 copies)
5) Dry Detention Operations & Maintenance Agreement, signed and sealed (5 copies)
6) Revised Road D-Crossing #3 Impact Map & Vertical Cross-section
7) Photo's of stream and impact area for proposed Road D-Crossing #3 (5 copies)
8) Revised pages 3, 4, 5 & 8 of the PCN (5 copies)
CC: Michael Whitehead-MacGregor Development Co., 201 Shannon Oaks Circle, Cary, NC 27511
2
10. Describe the overall project in detail, including the type of equipment to be used: The
proposed project consists of the construction of a residential subdivision with typical utilities (i.e.
sewer, water). Typical construction and ading_gquipment will be utilized for this project.
11. Explain the purpose of the proposed work: The purpose of the proposed project is to
develop a residential subdivision.
IV. Prior Project History
If jurisdictional determinations and/or permits have been requested and/or obtained for this
project (including all prior phases of the same subdivision) in the past, please explain. Include
the USACE Action ID Number, DWQ Project Number, application date, and date permits and
certifications were issued or withdrawn. Provide photocopies of previously issued permits,
certifications or other useful information. Describe previously approved wetland, stream and
buffer impacts, along with associated mitigation (where applicable). If this is a NCDOT project,
list and describe permits issued for prior segments of the same T.I.P. project, along with
construction schedules. S&EC conducted a preliminary wetland delineation followed by a
detailed wetland delineation and Neuse Buffer evaluation in April of 2004. Ms. Jennifer
Burdette, formerly of the USACE, verified our delineation on November 30, 2004. A sign-off
map will be submitted at a later date. Mr. Michael Horan of the NC-DWQ conducted a site visit
to determine features subject to the Neuse Buffer Rules (NBRRO#04-0211: letter is attached).
No previous permits have been issued for the project.
V. Future Project Plans
Are any future permit requests anticipated for this project? If so, describe the anticipated work,
and provide justification for the exclusion of this work from the current application.
No future permit requests are anticipated for this project at this time.
VI. Proposed Impacts to Waters of the United States/Waters of the State
It is the applicant's (or agent's) responsibility to determine, delineate and map all impacts to
wetlands, open water, and stream channels associated with the project. Each impact must be
listed separately in the tables below (e.g., culvert installation should be listed separately from
riprap dissipater pads). Be sure to indicate if an impact is temporary. All proposed impacts,
permanent and temporary, must be listed, and must be labeled and clearly identifiable on an
accompanying site plan. All wetlands and waters, and all streams (intermittent and perennial)
should be shown on a delineation map, whether or not impacts are proposed to these systems.
Wetland and stream evaluation and delineation forms should be included as appropriate.
Photographs may be included at the applicant's discretion. If this proposed impact is strictly for
wetland or stream mitigation, list and describe the impact in Section VIII below. If additional
space is needed for listing or description, please attach a separate sheet.
1. Provide a written description of the proposed impacts: Permanent impacts associated
with road construction and widening include 0.15 acres of Zone 1 Neuse Buffer, 0.14 acres
of Zone 2 Neuse Buffer. Temporary impacts due to sanitary sewer line installation and
Page 3 of 10
additional access needed for the construction of the roads include 95 linear feet of stream
channel, 0.33 acres of Zone 1 Neuse Buffer, 0.19 acres of Zone 2 Neuse Buffer, .030 acres of
open water impacts and 0.396 acres of wetlands.
2. Individually list wetland impacts. Types of impacts include, but are not limited to
mechanized clearing, grading, fill, excavation, flooding, ditching/drainage, etc. For dams,
separately list impacts due to both structure and flooding.
Wetland Impact Type of Wetland Located within Distance to Area of
Site Number Type of Impact (e.g., forested, marsh, 100-year Nearest Impact
(indicate on map) herbaceous, bog, etc.) Floodplain Stream (acres)
es/no linear feet
Utility Impact Permanent
Headwater Forested
No
0 0.132
Map #1 Temporary 0.264
Total Wetland Impact (acres) 0.396
3. List the total acreage (estimated) of all existing wetlands on the property: >0.5 acres
4. Individually list all intermittent and perennial stream impacts. Be sure to identify temporary
impacts. Stream impacts include, but are not limited to placement of fill or culverts, dam
construction, flooding, relocation, stabilization activities (e.g., cement walls, rip-rap, crib
walls, gabions, etc.), excavation, ditching/straightening, etc. If stream relocation is proposed,
plans and profiles showing the linear footprint for both the original and relocated streams
must be included. To calculate acreage, multiply length X width, then divide by 43,560.
Stream Impact
Perennial or Average Impact Area of
Number Stream Name Type of Impact
Intermittent? Stream Width Length Impact
(indicate on ma Before Impact linear feet acres
Utility Impact UT to Beverdam
Temporary
Perennial +/- 3'
31
0.002
Map #1 Crk
Utility Impact UT to Beverdam
Temporary
Perennial +/- 3'
34
0.002
Map #1 Crk
Utility Impact UT to Beverdam
Temporary
Perennial +/- 3'
30
0.002
Map #2 Crk
Total Stream Impact (by length and acreage) 95 0.006
5. Individually list all open water impacts (including lakes, ponds, estuaries, sounds, Atlantic
Ocean and any other water of the U.S.). Open water impacts include, but are not limited to
fill, excavation, dredging, flooding, drainage, bulkheads, etc.
Open Water Impact Name of Waterbody Type of Waterbody Area of
Site Number (if applicable) Type of Impact (lake, pond, estuary, sound, bay, Impact
indicate on ma ocean, etc. acres
Page 4 of 10
Crossing #1 N/A Road-temporary Pond 0.010
Crossing #1 N/A Utility-temporary Pond 0.020
Total Open Water Impact (acres) 0.030
6. List the cumulative impact to all Waters of the U.S. resulting from the project:
Stream Im act (acres): 0.006
Wetland Impact (acres): 0.396
Open Water Impact (acres): 0.030
Total Impact to Waters of the U.S. (acres) 0.432
Total Stream Impact (linear feet): 95
7. Isolated Waters
Do any isolated waters exist on the property? ? Yes ® No
Describe all impacts to isolated waters, and include the type of water (wetland or stream) and
the size of the proposed impact (acres or linear feet). Please note that this section only
applies to waters that have specifically been determined to be isolated by the USACE.
8. Pond Creation
If construction of a pond is proposed, associated wetland and stream impacts should be
included above in the wetland and stream impact sections. Also, the proposed pond should
be described here and illustrated on any maps included with this application.
Pond to be created in (check all that apply): ? uplands ? stream ? wetlands
Describe the method of construction (e.g., dam/embankment, excavation, installation of
draw-down valve or spillway, etc.): N/A
Proposed use or purpose of pond (e.g., livestock watering, irrigation, aesthetic, trout pond,
local stormwater requirement, etc.): N/A
Current land use in the vicinity of the pond: N/A
Size of watershed draining to pond: N/A Expected pond surface area: N/A
VII. Impact Justification (Avoidance and Minimization)
Specifically describe measures taken to avoid the proposed impacts. It may be useful to provide
information related to site constraints such as topography, building ordinances, accessibility, and
financial viability of the project. The applicant may attach drawings of alternative, lower-impact
site layouts, and explain why these design options were not feasible. Also discuss how impacts
were minimized once the desired site plan was developed. If applicable, discuss construction
techniques to be followed during construction to reduce impacts.
The client requested a nreliminarv and detailed wetland delineation and Neuse Buffer
evaluation for the project prior to site plan development. The widening of Pippin Road
(Crossings 1 and 2) is necessary to accommodate the increased traffic in the area, however the
applicant has utilized the existing Right-Of-way to widen the road so no new stream impacts are
proposed. Crossing 3 proposes to impact a ditched, intermittent stream within an agricultural
field (see attached USACE & DWO stream forms and photos). This crossing is needed for
internal connectivity, to insure safety due to the number of lots served and to accommodate
future development to the northern portion of the property. In addition, this is the only
Page 5 of 10
2. If "yes", identify the square feet and acreage of impact to each zone of the riparian buffers.
If buffer mitigation is required calculate the required amount of mitigation by applying the
buffer multipliers.
Zone* Crossing 1 Multiplier Required
(square feet Mitigation
1 273 perm 3 (2 for Catawba) N/A
1,984 temp**
2 1,334 perm 1.5 N/A
641 temp
Total 1,607 perm 1.5 N/A
2,625 temp
* Zone 1 extends out 30 feet perpendicular from the top of the near bank of channel; Zone 2 extends an
additional 20 feet from the edge of Zone 1.
** Temporary Zone I impacts will not be impervious, these areas will be re-vegetated.
Zone* Crossing 2 Multiplier Required
(square feet Mitigation
1 1,52 tperm. emp**
18 3 (2 for Catawba) N/A
2 835 perm 1.5 N/A
518 temp
Total 837 perm 1.5 N/A
2,036 temp
* Zone 1 extends out 30 feet perpendicular from the top of the near bank of channel; Zone 2 extends an
additional 20 feet from the edge of Zone 1.
** Temporary Zone 1 impacts will not be impervious, these areas will be re-vegetated.
Zone* Crossing 3 Multiplier Required
(square feet Mitigation
1 6,310 perm 3 (2 for Catawba) N/A
715 temp**
2 3,973 perm 1.5 N/A
452 temp
Total 10,283 perm 1.5 N/A
1,167 temp
* Zone I extends out 30 feet perpendicular from the top of the near bank of channel; Zone 2 extends an
additional 20 feet from the edge of Zone 1.
** Temporary Zone 1 impacts will not be impervious, these areas will be re-vegetated.
Zone* 6 Utility Lines
(square feet Multiplier Required
Mitigation
1 10,409 3 (2 for Catawba) N/A
2 6,682 1.5 N/A
Total 17,091 1.5 N/A
* Zone 1 extends out 30 feet perpendicular from the top of the near bank of channel; Zone 2 extends an
additional 20 feet from the edge of Zone 1.
Page 8 of 10
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.
OPERATIONS AND MAINTENANCE AGREEMENT
WEAVERS POND SUBDIVISION
DRY DETENTION BASINS #l, #2, & #3
1. INTRODUCTION
This manual establishes procedures for maintenance of the dry detention pond for the
Weavers Pond Subdivision. These procedures are in compliance with the guidelines of
DWQ Stormwater Runoff Management Policy that requires the dry detention pond be
inspected and maintained as part of the development.
A. Dry Detention Pond
The dry detention pond will function as a stormwater control facility by providing
temporary storage of post-development runoff in excess of pre-development runoff. The
pond is designed to provide a 2-5 day discharge of the volume from a 1" rain in
accordance with Division of Water Quality Policy.
II. MAINTENANCE
A. Vegetation
The dry detention pond has a ground cover of fescue, which, if properly
maintained, will prevent erosion of the embankment and provide an easy surface
for inspection. Grass should be fertilized every October and April.
Re-seeding - Periodically re-seeding may be required to establish grass on
areas where seed did not take or has been destroyed. Before seeding,
fertilizer (12-12-12) should be applied at a minimum rate of 12 to 15 pounds
per 1,000 SF. The seed should be evenly sewn at a rate of three pounds per
1,000 SF. The seed should be covered with soil to the depth of
approximately 1/4". Immediately following the planting, the area should be
mulched with straw.
Mowing - Grass mowing and removal of weed vegetation will be necessary
for the proper maintenance of the embankment. All slopes should be mowed
when the grass exceeds 8" in height. Acceptable methods include the use of
weed whips or power brush cutters and mowers. Grass and vegetation
clipping shall be bagged and removed from the site, they will not be allowed
to remain on the ground which would result in washing into the storm water
system.
B. 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. Proper care of vegetative areas that develop
erosion is required to prevent more serious damage to the slopes. Rills and
gullies should be filled with suitable soil compacted and then seeded. Where
eroded areas are observed, the cause of the erosion should be addressed to
prevent a continued maintenance problem.
C. Standing Water
• Areas where water "stands" shall be re-graded to provide a minimum 0.5%
slope.
D. Storm Water Sewers/Culverts
A. Structural Elements - At a minimum, the structural elements of the
underground stormwater culverts should be thoroughly inspected once
a year. Several of the structural elements may need more frequent
inspections. The inspections should include the following:
The inside of the structure should be inspected for cracks,
spalling, joint failure or leaks a minimum of once per year. If
signs of cracks, leaks, misalignment, sagging or settlement of the
structure or storm sewers are observed, a Civil Engineer or
Geotechnical Engineer should be retained to determine the
probable cause and recommended remediation.
The orifice should be inspected and storm sewers should be
inspected for debris or sediment accumulation after every major
storm event. Any sediment or debris removal should be removed
to prevent blockage. Sediment shall not be flushed into storm
system and shall be collected and removed from the site.
The outlet pipe should be visually inspected for sagging and
alignment a minimum of once per year.
Ili. OPERATION
A. Record Keeping
Operation of the dry detention pond should include recording of the following:
• Annual Inspection Reports - A collection of written reports should be kept
on file with the Homeowner's Association. A visual inspection should be
conducted annually by a professional engineer or his/her representative. All
visual observations should be recorded.
• Maintenance - Recommendations for maintenance and/or repairs should be
recorded within the Annual Inspection Report.
• Other Operational Procedures - The Homeowner's Association should
maintain a complete and up-to-date set of plans (as-built drawings) and all
changes made to the dry detention pond over time should be recorded on the
as-builts by a Professional Engineer.
B. Sedimentation and Dredging
The accumulation of sediment within the dry detention pond may require
periodic removal to maintain sufficient capacity for storage of stormwater. The
frequency of this sediment removal can be reduced by ensuring that the site areas
around the upland areas are stabilized with a vegetative ground cover such that it
restrains erosion. The removed material should be hauled offsite to a suitable
site or mounded somewhere on site and stabilized with a ground cover sufficient
to restrain erosion.
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.
Print
Title
Address: Ur Skx4&-v, QaN CL,;ti Sub,,, 201
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.
a Notary Public for the State of
M' County of e , do hereby certify that
r'P personally appeared before me this
day of V Q?Oyoo_.i'N , QP-64,, and acknowledge the due execution of the
forgoing wet [wetland] detention basin maintenance requirements. Witness my hand
and official seal, 4to
Q`t ?0 A R Y <
i
'rZ ': 'O X181-?G V
CO UN?y,\07
SEAL l
My commission expires 'Z> V? • ap-
LEVEL SPREADER OPERATION AND MAINTENANCE AGREEMENT
WEAVERS POND SUBDIVISION
The level spreader is defined as an elongated, level. threshold, designed to diffuse
stormwater runoff.
Maintenance activities shall be performed as follows:
1. After construction and until vegetation has been established, level spreader(s)
shall be inspected after every rainfall. Thereafter, level spreader(s) shall be
inspected at least every month and more frequently during the fall season and
after heavy rainfall events:
a. Accumulated sediment, leaves, and trash shall be removed, and
repairs made if required.
b. Inspect level spreader(s) for evidence of scour, undercutting,
settlement of the structure, and concentrated flows downhill from the
level spreader(s).
C. A level elevation shall be maintained across the entire flow-spreading
structure at all times. Repair or replace the level spreader if it is
damaged.
d. Mow vegetative cover to a height of six (6) inches and prune plants if
they cover over half of the level spreader surface.
e. Repair eroded areas and replace/replant dead or damaged
vegetation.
1. Vegetation
Grass should be fertilized every October and April.
Re-seeding - Periodically re-seeding may be required to establish
grass on areas where seed did not take or has been destroyed.
Before seeding, fertilizer (12-12-12) should be applied at a
minimum rate of 12 to 15 pounds per 1,000 SF. The seed should
be evenly sewn at a rate of three pounds per 1,000 SF. The seed
should be covered with soil to the depth of approximately 1/4".
Immediately following the planting, the area should be mulched
with straw.
Mowing - Grass mowing and removal of weed vegetation will be
necessary for the proper maintenance of the embankment. All
slopes should be mowed when the grass exceeds 8" in height.
Acceptable methods include the use of weed whips or power
brush cutters and mowers.
2. The contractor should avoid the placement of any material on and prevent
construction traffic across the structure. If the measure is damaged by
construction traffic, it shall be repaired immediately.
3. Inspect and repair the collection system (e.g., catch basins, pipes, swales,
riprap) four (4) times a year to maintain proper functioning.
I acknowledge and agree by my signature below that I am responsible for the
performance of the seven 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. A '
Print name: P1111'.
[P.0; A Prvpc. ?_?_ L-c-6
Title: L ?. UJLk t . Pmt LO
Note
a Notary Public for the State of
Y' e- , do hereby certify that
personally appeared before me this
a and acknowledge the due execution of the
forgoing wet [wetland] detention basin maintenance requirements. Witness my hand
and official seal,
M00 ?''V4,
?Q';•'•0? AR y
d ?
PU8%?q CV
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COU
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.
SEAL //ll
My commission expires
v
Address:'&( %7AoLft 1941 ?? ?r'?e lAf a.utar?? `1 . ?