20060447 Ver 1_NOV Response_20080408

Apri14, 2008
S&EC Project No. 4865.D1
Environmental Consultants, PA
Road Raleigh, North Carolina 27b14 Phone: {919) 84G-5904 Fax: {919) $46-9467
www.SandEC.com
Mr. Mark Bertoncino
Olde Towne Company, LLC
5810 Cameo Glass Way
Raleigh, NC 27612
Reference: Olde Towne Subdivision
Q~c~~oe~~
APR 8 2006
DENR -WATER QUALITY
WETLANDS AND STpRMWATER Bi2ANCH
Sediment Impact Delineation Report & Clean-up Plan
Wake County, NC
DWQ Project No. 06-0447
Dear Mr. Bertoncino:
Soil & Environmental Consultants, PA (S&EC) has been engaged by Olde Towne
Company, LLC to prepare a Sediment Impact Delineation Report and Clean-up Plan for
wetland and open water (pond) sediment impacts which occurred within the referenced
project site. These actions are in response to observations made by the Division of Water
Quality (DWQ) and United States Army Corps of Engineers (USAGE) as sited in the
Notice of Violation dated March 7, 2008 and the Cease and Desist Letter (Action ID
#200620287) dated November 2, 2007.
The purpose of this letter is to summarize our findings regarding sediment deposition that
has occurred onsite and describe in detail our plan for its clean-up and proper disposal.
Site Description
The project site, a proposed subdivision and golf course of approximately 547 acres, is
located east of Highway 440, along New Hope Road, between Poole Road and Rock
Quarry Road in the City of Raleigh in Wake County, North Carolina. A vicinity map is
provided in Figure 1.
Field Efforts and Onsite Observations
Our observations and evaluations were focused on sediment clean-up deposition with in a
portion of previously delineated site wetlands and an open water pond. These areas were

Olde Towne Subdivision
Soil & Environmental Consultants, PA
Apri14, 2008
Project No. 4865.D 1
impacted by sedimentation from site grading operations of upland areas. S&EC
performed an onsite inspection on March 21, 2008. While onsite we observed the
characteristics of the site (including current grading and stabilization operations), the
surrounding area, verified surface and channel flow conditions, observed wetland and
open water sediment deposition, and observed existing property boundaries, utilities,
water conveyance structures, and existing erosion and sediment control measures.
During our initial site visit, the impacted areas were traversed and the extent and severity
of the impacts was observed. While onsite, we identified, delineated (with sequentially
lettered and numbered flags), and GPS located the approximate boundaries of the flagged
sediment impacts.
From our site observations, sediment appears to have entered the impacted wetlands and
pond by one of two primary means: 1) from streambank erosion of an impacted stream
channel, and 2) at various locations onsite where existing Erosion and Sedimentation
(E&S) devices were overwhelmed.
A total of 0.56 acres (24,394 square feet) of wetlands and 0.11 acres (4,780 square feet)
of the pond were impacted by the deposition of sediment. This deposition varied from a
skim layer up to thicknesses of approximately fifteen (15) inches. Areas of sediment
accumulation in the wetland and pond were flagged in the field and are shown on the
attached site maps (Sheets 1 to 3). Photos representative of our observations are also
provided for reference.
Observed Sediment Deposition
Sediment deposition observed onsite varies considerably within the wetland and open
water pond. For ease of evaluations we have divided observed sediment impacts into one
of three categories:
Category 1 (within the wetland area) -Sediment deposition in excess of
approximately two (2) inches in thickness which will require removal and proper
disposal.
Category 2 (within the wetland area) -Sediment deposition less than
approximately two (2) inches in thickness which will remain in place.
Category 3 (within the pond) -Open water sediment deposition varying from two
(2) to in excess of fifteen (15) inches in thickness which will require removal.
NOTE.• Based on experience with similar sediment deposition and subsequent
clean-up operations, it is our opinion that deposition layers less than
approximately two (2) inches in thickness should remain in place. Clean-up of
thin layers can result in damage to the underlying soils which will exceed the
temporary nature of localized thin layered deposition.
These impacted areas have been identified on the attached maps (Sheets 1 to 3).
Page 2 of 5

Olde Towne Subdivision
Soil & Environmental Consultants, PA
Proposed Clean-up Operations
Apri14, 2008
Project No. 4865.D1
This clean-up plan has been prepared for the sole purpose of providing a systematic
approach to remove and/or stabilize in place sediment deposited into the wetland and
open water pond.
Based on our site observations and experience with similar projects, S&EC proposes the
following steps be performed to remove the existing sediment impacts onsite and reduce
the potential for future sediment impacts:
Step 1 Repair as necessary and augment existing site Erosion and
Sediment (E&S) control measures including silt fence, existing
sediment traps, sediment basins, and temporary stabilization
measures. All additional E&S control measures and repairs should
be performed /installed in accordance with NCDENR approved
standards and the approved Erosion and Sediment Control Plan (by
others). Temporary and permanent seeding measures should be
applied at the earliest opportunity across exposed (non-actively
graded) portions of the site.
All existing and new E&S devices should be inspected and cleaned
out (sediment removed from upstream of the devices) as required.
Typically the frequency of inspection is weekly, and after each
rainfall event of 0.5 inches (or greater).
Step 2 To the extent, required by DWQ, manually remove excess
sediment in the wetland (Category 1) as identified on the plan
sheets. Sediment will be excavated to a depth that reaches the
approximate natural grade (as determined by S&EC personnel).
All wetland excavation will be performed by hand. Excavation
will be performed with manual labor using shovels (flat head or
"sharp shooter") and 5 gallon buckets. Caution will be applied so
as not to disturb the original wetland surface.
Existing easements or site trails and roads will be used for
vehicular and mechanized equipment access to assist in mass
sediment removal. Where heavy equipment is used every effort
will be made to reduce the impact to the existing vegetation. No
thinning or clearing of vegetation will be performed. Delineated
wetland areas will not be trafficked with motorized equipment to
perform clean-up operations.
Recovered sediment will be transported away from any channel,
wetland, or ponds and disposed of properly (in accordance with
State and local regulations).
Page 3 of 5

Olde Towne Subdivision Apri14, 2008
Soil & Environmental Consultants, PA Project No. 4865.D1
Step 3 To the extent, required by DWQ, manually remove excess
sediment in the open water pond (Category 3) as identified on the
plan sheets. Sediment will be excavated to a depth that reaches the
approximate original pond bed (as determined by S&EC
personnel).
Based on the estimated volume of sediment accumulated, impacted
areas within the open water pond will require mechanized
equipment to perform clean-up operations. Prior to excavation, the
pond water surface should be lowered (through pumping, siphon,
or other means) to a depth which will reasonably expose the
deposited sediment.
Excavated material shall not be double handled within the pond or
pond bed. Caution shall be applied so as not to disturb the original
pond bed. Where heavy equipment is used every effort will be
made to reduce the impact to the existing vegetation.
Recovered sediment will be transported away from any channel,
wetland, or ponds and disposed of properly (in accordance with
State and local regulations).
Step 4 Impacted wetland areas onsite will be seeded with a native wetland
seed mix following clean-up. The seed mix should include a
minimum of four species with a wetland indicator status of FAC,
FACW or OBL.
Species may include but are not limited to:
• Virginia Wild Rye (Elymus virginicus)
• Soft Rush (Juncus effusus)
• Sedge (Carex lurida, lupulina, or vulpinoidea)
• Woolgrass (Scirpus cyperinus)
• Cardinal Flower (Lobelia cardinalis)
• Lizard's Tail (Saururus cernuus)
Acceptable wetland seed mixes are commercially available that
include many more species and are designed for specific site
situations. Preference should be given to southeastern seed sources
and/or NC ecotype seeds in order to ensure seeds are adapted to the
local climate. Seed should be applied at a rate of 15 pounds per
acre (or as directed by the seed supplier) and covered with light
straw mulch.
Clean-up operations will be performed under the direct supervision of an individual with
a thorough understanding of the purpose and the delicate manner in which manual
methods should be performed. We understand that Olde Towne Company, LLC will
engage S&EC to provide periodic onsite observation of sediment clean-up operations and
Page 4 of 5

Olde Towne Subdivision
Soil & Environmental Consultants, PA
Apri14, 2008
Project No. 4865.D1
provide guidance to the clean-up contractor based on experience and site conditions at
that time.
Implementation Schedule
Clean-up work should be executed immediately following the review and approval of this
plan by USAGE and DWQ. Based on experience with similar projects, we anticipate the
clean-up work can be completed (barring any inclement weather) within 30 days of the
approval of this plan. A notification should be submitted to DWQ and USAGE following
the completion of site work.
Please contact me if you have any questions or comments regarding these
recommendations.
Sincerely, ~ ~~~ c,,t ~ «
SOIL & ENVIRONNIENTA~`_'~N~iANTS. PA
~~J~ ~~~~
Rebecca S. Peterson, P.E.
N.C. License No. 031266
` ..y
1 '~ ~cAL ~•: -
Q ,31266. ~
GI NE~r''~~n~ *..
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Attachments: Figure 1 -Vicinity Map
Site Maps - (Sheets 1 through 3)
Site Photos (1 through 11)
Cc: Ms. Cyndi Karoly, DWQ, 2321 Crabtree Blvd., Suite 250, Raleigh, NC 27604
Mr. Ian McMillan, DWQ, 2321 Crabtree Blvd., Suite 250, Raleigh, NC 27604
Mr. Monte Matthews, USAGE, 3331 Heritage Trade Drive, Suite 105, Wake Forest,
NC 27587
Ms. Vicki Fuentes, DWQ, 3800 Barrett Drive, Raleigh, NC 27609
Ms. Natalie Landry, DWQ, 3800 Barrett Drive, Raleigh, NC 27609
Mr. Patrick Paine, City of Raleigh, PO Box 590, Raleigh, NC 27602
Page 5 of 5

Map
Sediment Impact Photos
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Photo 1-Impact Area 1-Category 1 Impacts in Foreground, Category 2
Impacts in Background, Looking Northeast
Olde Town Subdivision-Sediment Clean-up Plan Soil & Environmental Consultants, PA
April 2008 S&EC Job # 4865.D 1
Photo 2-Impact Area I-Category 1 Impact Area (Typical), Heavy
Deposition Typically Excess of 2-inches in Thickness

Sediment Impact Photos
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Photo 3-Impact Area 1-Category 1 Impacts (Typical), Heavy
Deposition Typically in Excess of 2-inches, Consisting of Silt, Sands,
and Gravel Over Wetland Surface (Hydric Soils)
Olde Town Subdivision Sediment Clean-up Plan Soil & Environmental Consultants, PA
April 2008 S&EC Job # 4865.D1
Photo 4-Impact Area 1-Category 2 Impacts (Typical),
Looking Southwest

Sediment Impact Photos
Photo 5-Impact Area 1-Category 2 Impacts (Typical), Thin Layered
Deposition Typically Less Than 2-inches in Thickness
Photo 6-Impact Area 1-Category 2 Impacts (Typical), Thinly Layered
Deposition Typically Less Than 2-inches, Consisting of Silt and Fine
Sands Over Wetted Surface (Hydric Soils)
Olde Town Subdivision-Sediment Clean-up Plan Soil & Environmental Consultants, PA
Apri12008 S&EC Job # 4865.D 1

Sediment Impact Photos

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Olde Town Subdivision-Sediment Clean-up Plan Soil & Environmental Consultants, PA
April 2008 S&EC Job # 4865.D 1

Sediment Impact Photos
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Photo 10-Impact Area 2-Sediment Area F-Category 3 Impacts-
Along North Edge of Water, Looking East
Olde Town Subdivision-Sediment Clean-up Plan Soil & Environmental Consultants, PA
April 2008 S&EC Job # 4865.D 1

Sediment Impact Photos
Photo 11-Impact Area 2-Sediment Area G-Category 3 Impacts-
Along North Edge of Water, Looking East
Olde Town Subdivision Sediment Clean-up Plan Soil & Environmental Consultants, PA
April 2008 S&EC Job # 4865.D 1

DRAWINGS PRINTED
AT HALF- SCALE
NORTH
SCALE I " = 250'
250 ~2_5~0
Existing
Power Lines
Existing Site
Entrance
IMPACT AREA 2
EXISTING
STREAM CHANNEL
[[~~
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u UTILITY LINES
PARCELS
Existing
Open-Water
Pond
© 2008 Sod 4 Environmental Consultants, PA.
OVERALL SITE PLAN ~ INDEX SHEET
WETLAND BOUNDARIES
APPROX. SEDIMENT
BOUNDARIES

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NOTES:
I . SITE DATA INCLUDING ROADS, STREAMS, UTILITIES, AND
CHANNEL IMPACTS PROVIDED BY WITHERS ~ RAVENEL, INC
OF CARY, NC
2. LOCATIONS, ELEVATIONS, AND DIMENSIONS OF ALL SITE
FEATURES ARE APPROXIMATE.
3. SEDIMENT IMPACTS FLAGGED AND GPS DATA COLLECTED ON
MARCH 2 I , 2008, BY SPEC. ALL LOCATIONS ARE
APPROXIMATE.
4. CATEGORY I BOUNDARY MARKED WITH SEQUENTIALLY
NUMBERED PIN FLAGS (#X I -X 17)
5. CATEGORY 2 BOUNDARY MARKED WITH SEQUENTIALLY
NUMBERED PIN FLAGS (#A I -A26 AND B I -828)
Permanent Stormwater Pond
(Footprint Approximate)
Category l (within the wetland area) -Sediment
deposition in excess of approximately two (2)
inches in thickness which will require removal and
proper disposal.
Category 2 (within the wetland area) -Sediment
deposition less than approximately two (2)
inches in thickness which will remain in place.
~OLDE TOWNS SUBDIVISION ~ 4a6s.Dl
RESTORATION PLAN Pr°~ Mgr.: °'aW":
• Soil & Environmental Consultants, PA DG NMM
Location: bent: tale:
11010 Raven Ridge Road Raleigh, North Carolina 27614 Phone: [phone] Fax: [phone] WAKE COUNTY, NC OLDS TOWNS COMPANY, LLC I ~~ = 25'
www.SandEC.eom Sheel Title: .sheet No.:
IMPACT AREA I 2 OF 3

DfZAWINGS PRINTED
AT HALF- SCALE
NORTH
SCALE I " = 30'
30 15 0 IS
Existing
Dam
Sediment Area G
/ `\ ~
NOTES:
I . SITE DATA INCLUDING ROADS, STREAMS, UTILITIES, AND
CHANNEL IMPACTS PROVIDED BY WITHERS ~ RAVENEL, INC.
OF CARP, NC
2. LOCATIONS, ELEVATIONS, AND DIMENSIONS OF ALL SITE
FEATURES ARE APPROXIMATE.
3. SEDIMENT IMPACTS FLAGGED AND GPS DATA COLLECTED ON
MARCH 2 I , 2008, BY SPEC. ALL LOCATIONS ARE
APPROXIMATE.
4. CATEGORY 3 BOUNDARIES MARKED WITH SEQUENTIALLY
NUMBERED PIN FLAGS (#C I -C I I, D I -D3, E I -E3, F I -F6,
G 1-G3)
0 2008 Sod ~ Enwronmentaf Consultants, PA.
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Existing Open
Water Pond
IMPACT AREA 2
EXISTING off, CATEGORY 3
STREAM CHANNEL ~°~ SEDIMENT IMPACTS
UTILITY LINES ~ PHOTO POINTS
ediment Area F
1 ~-Sediment Area E
Sediment Area D
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Inflow Channel
Location (approx.)
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sediment deposition varying from two (2) to in
excess of fifteen (I 5) inches in thickness which
will require removal.
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