20200600 Ver 1_RiverParkNorth_Buffer_Authorization_Narrative (2)_20200506

River Park North
Primitive Trail
Riparian Buffer Authorization
River Park North
1000 Mumford Rd
Greenville, NC
i'
*44ivers
& ASSOCIATES, INC.
Since 1918
ENGINEERS, PLANNERS, SURVEYORS & LANDSCAPE ARCHITECTS
F-0334
107 E. 2"d Street
Greenville, NC 27858
252-752-4135
��,;;nnurnrr,r�
SEAL
Matthew J Prokop, PE
Date: 05HO120

TABLE OF CONTENTS
Project Overview 1
Site Description 1
Proposed Trail 3
Impact Justification and Mitigation 5
Construction Techniques 7
Compensatory Mitigation 7
Diffuse Flow 7
Supplementary Information 8
1V17[M,
Table 1: River Park North Stream Lengths 1
Table 2: Corrected Effective Model Edits 3
Table 3: Water Surface Elevation Comparison 4
Figures
Figure 1: River Park North Trail Overview 2
Figure 2: Proposed Trail Clearing Limits 3
Figure 3: Typical Trail Cross Sections 4
Figure 4: Existing Landward Inundation 5
Figure 5: Riparian Buffer Zone 1 Encroachment 6
Figure 6: Silt Fence Detail 7
Appendices
Appendix A: NRCS Soil Data
Appendix B: FEMA FIRM Data

Project Overview
The City of Greenville is planning on constructing approximately 7500 linear feet of a primitive trail located
on the current River Park North property. The proposed trail will consist of a 10'-wide corridor with a 6'
wide compacted primitive trail. The proposed primitive trail will begin at the end of an existing, gravel -
lined trail and will extend eastward to the end of the park property.
Site description
The existing River Park North sits on 293 acres of land on the north bank of the Tar River in Greenville,
NC. The existing park contains the Walter L. Stasavich Science and Nature Center offers opportunities
to learn about science and nature in Eastern NC with a variety of exhibits, including a turtle touch tank,
10,000 gallon freshwater aquarium, live snakes, and more. Listed on the NC Birding Trail, you may see
Bald Eagles and Osprey fly overhead, along with Yellowthroat, Indigo Bunting, and Blue Grosbeak
throughout the park, as well as wad-ing birds and other wintering waterfowl at the lakes. The park also
contains 5 ponds, 2 piers, and rental fishing boats, pedal boating, campsites, wildlife observation
platforms, hiking trails, picnic shelters, a volleyball court and a fossil pit.
GIS data published by the North Carolina Department of Environmental Quality and USGS NHD data
were used to identify existing flow paths and wetland areas. Per DEQ data, the park property contains
approximately 237 acres of delineated wetlands, of which 229 acres consist of Riverine Swamp Forest.
Three existing flow paths were identified on the property, and are shown in Table 1.
Table 1: River Park North Stream Lengths
Stream
Type
Stream Index
Classification
Length ft
Tar River
Perennial
28- 94
C:NSW
9300
Parkers Creek
Perennial
28-95
C:NSW
1600
Unnamed
Stream
Intermittent
N/A
N/A
2500
Total
13,400
According to the NRCS soil survey of the site, the existing soils on the proposed trail path are identified
as Bibb complex (Bb), which are typical of floodplain areas. The soils are defined as a sandy loam, are
poorly drained, with water tables within a foot of existing grade. Detailed soil data on the site can be
found in Appendix A of this report.
The park property is within in the regulatory floodway for the Tar River, as identified in the July 7, 2014
Flood Insurance Study for Pitt County (Map Number 3720468800K). Base flood elevations range from
21.3-22.2 ft NAVD 83.
A project overview can be found in Figure 1.

LL

Proposed Trail
The proposed trail will be a 6-ft wide trail tread, with an additional 2-ft wide corridor clearing on both sides
and an 8-ft high vertical clearance. The trail tread will be mechanically compacted. Clearing and
compaction will be done to maintain a rolling contour. Mechanical equipment for clearing and grading
(i.e. front end loaders, etc) will be accessing the project area.
All spoils from bench cutting construction will be dispersed evenly and covered with leaf litter to fully cover
all raked spoils. All vegetation cleared within the specified corridor clearing limits will be removed to a
distance of at least 20 feet away from the corridor. All removed vegetation will be scattered to the
landward side of the trail.
Typical cross-section details of the proposed trail are shown below in Figures 2-3.
Figure 2: Proposed Trail Clearing Limits
CLEARING LIMITS
NOT i0 SCAIF f
I
CleQring Limits (mm)
Lu-Al-�A JOAN [kamntl Fleignt
ALL I{
� Ilp�il� I
� I
r�y Trlr-branches
k #i lush with
f 4 a trunk rather
a than remove
try.
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I
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72"
R... d 6. 6A. — J M
1-.ri66.3f
WUMP Flelgnt Requirements' (MM)
Sip Poslpon
Sipe I'kve
Uphil
Downhill
Sumps betoeen the
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1­510
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4"
4"
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4"
♦"
'RrrVs oumde the
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"
5do soRo ax* 1q7,
#"
;"
"Kil Heights meosured do uphill side of stumps.
2' 2'
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Ir
-v mmrm �� {
Lit
r
Source: US Forest Service';_-,- ,I
3

Figure 3: Typical Trail Cross Sections
TYPICAL TRAIL CROSS SECTION
NCT TO SCULL
-.—cu Tit a, be,.dh +fir-�ee xi!,- R of
* -x,DDs Oat * tmobed 6-1ns.
qWQ rL.-E)Irq in
L4^rr4— —via-M
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rr.M".W,- -49"
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SMM riSundi'Hy r}
y�� f 9ulo, neG I
4
1
wm
Source: US Forest Service
2
Trailbed Width
�..x,dlieea
INiat?' (men)
ALL 1 T2"
r!. ... -
I I97s 9 1� -

Impact Justification and Mitigation
The proposed trail will consist of a compacted earth surface. The proposed trail will not increase any
impervious area to the riparian buffer.
The overall path of the trail was selected to maintain as much of the natural grade as possible. The trail
location is within the floodplain of the Tar River, with generally flat slopes. The existing flat slopes will
minimize any need for any excavation and/or fill along the proposed trail path. The selected path was
kept within Zone 2 of the riparian buffer whenever reasonable.
Approximately 200 feet of the proposed trail path will fall within Zone 1 of the riparian buffer. Within this
section, the natural ground is of higher elevation along the Tar River channel bank. Landward, the
natural ground flattens out into a wider, low-lying area that is frequently inundated. This inundation is
currently not delineated, but was observed in the field. The inundation is shown below in Figure 4.
A detailed view of the Zone 1 encroachment can be found in Figure 5.

Figure 5: Riparian Buffer Zone 1 Encroachment
Legend
15 30 60 90 120
Fee
Trail -Corridor
Buffer Zone 1 N , 40
Buffer Zone 2 w� E `-4
ivers
Intermittent Wetland S & ASSOCIATES, INC.
Since 1918

Construction Techniques
As mentioned, the trail path was selected to minimize the need for any disturbance to the natural profile
Existing vegetation will be removed down to the finished grade. Excavation will not be performed to
completely remove any underground portions of the existing vegetation. All removed vegetation will be
left adjacent to the trail, minimizing the movement of machinery within the project area.
All areas within Zone 1 of the riparian buffer will be protected with silt fencing during the construction
process. The extents of the silt fencing are shown in Figure 5. A silt -fence detail is shown in Figure 6.
Figure 6: Silt Fence Detail.
NOTES: VARIABLE AS DIRECTEDBYENGINEER
1 j USE STANDARD STRENGTH FABRIC
STEEL POST
S' (MIN)
WITH S' POST SPACING & WIRE (8' WITH WIRE FENCING - 6' WITHOUT FENCE)
1.25 LB/FT
FENCING WHERE REINFORCED SIL T
FENCE IS REQUIRED,
2) USE 6' POST SPACING AND NO WIRE
FENCING WITH EXTRA STRENGTH
EXTRA
FABRIC.
STRENGTH
3)WIRE FENCING TO BE 32" WITH 6 LINE
FABRIC
WIRES & STAY WIRES ON 12' CENTERS loom SEMI
(BOTTOM & TOP WIRES -10 GA.,
IMMEMMEMEMMMI
PLASTIC
PLASTIC OR
WIRE TIES
INTERMEDIATE WIRES -12.5 GA.)
NG
WIRE FABRIC & U V RESISTAN T
GEOTEXTILE FABRIC
`a
N
TAMPED
BACKFILL � / i�
GROUND LINE
8URYFABRIC8"DEEP WITH 4"7URINIOUT� /
LJ
A TEMPORARY SILT FENCE
N.T.S.
Compensatory Mitigation
The proposed changes to the parcel will have no measurable effects on any nitrogen and phosphorous
loading to the Tar River.
Diffuse Flow
Given the linear nature of the project, any impacts to the velocities of runoff discharges will be negligible.
7

Supplementary Information
This project is not an action by a state agency, will not disturb more than 10 acres, nor will it consist of an
expenditure of more than $10 million. The project will not fall under the jurisdiction of the State
Environmental Policy Act (SEPA).
No known violations of any pertinent legislation are currently present on this site.
Given that the property is owned by the City of Greenville specifically for public use it is not anticipated
that any future development on the property would be significant enough to where the trail would cause
any cumulative impacts.
The project will not include the construction of any habitable structure and will not require any sewage
disposal.
The proposed development will not encroach on, or discharge to, any delineated wetland. The proposed
trail will not affect any endangered species, designated critical habitat, or essential fish habitat.
The NC State Historic Preservation Office (HPO) GIS Web Service was utilized to determine that no
historic or cultural resources are located in the project vicinity.
This project is located within a designated FEMA Special Flood Hazard Area. A separate no -rise
certification is in process for this project. Final approval can be provided once complete.
M.

Appendix A: NRCS Soil Data

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Appendix B: FEMA FIRM data

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FEMA'SCOOPERATING TECHNICAL PARTNER
This digital Flood Insurance Rate Map (FIRM) was produced through a unique
cooperative partnership between the State of North Carolina and the Federal
Emergency Management Agency (FEMA). The State of North Carolina has
implemented a long term approach to floodplain management to decrease the
costs associated with flooding. This is demonstrated by the State's commitment
to map flood hazard areas at the local level. As a part of this effort, the State of
North Carolina has joined in a Cooperating Technical State agreement with
FEMA to produce and maintain this digital FIRM.
FLOOD HAZARD INFORMATION NOTES TO USERS SCALE
SEE FIS REPORT FOR ZONE DESCRIPTIONS AND INDEX MAP
THE INFORMATION DEPICTED ON THIS MAP AND SUPPORTING
DOCUMENTATION ARE ALSO AVAILABLE IN DIGITAL FORMAT AT
HTTP://FRIS.NC.GOV/FRIS
Without Base Flood Elevation (BFE)
Zone A, V, A99
With BFE or Depth zone AE, AO, AH, VE, AR
SPECIAL FLOOD Regulatory Floodway
HAZARD AREAS
0.2% Annual Chance Flood Hazard, Areas
a
of 1% Annual Chance Flood with Average
Depth Less Than One Foot or With Drainage
Areas of Less Than One Square Mile zone x
Future Conditions 1% Annual
Chance Flood Hazard zone x
OTHER AREAS OF Area with Reduced Flood Risk due to Levee
FLOOD HAZARD See Notes zone x
OTHER Areas Determined to be Outside the
AREAS `` 0.2% Annual Chance Floodplain zone x
------------- Channel, Culvert, or Storm Sewer
Accredited or Provisionally Accredited
GENERAL Levee, Dike, or Floodwall
STRUCTURES I I I I I I I I I I I I I Non -accredited Levee, Dike, or Floodwall
BM5510 p North Carolina Geodetic Survey bench mark
BM5510 ? National Geodetic Survey bench mark
BM551OZ Contractor Est. NCFMP Survey bench mark
-'t3 1•8-2— Cross Sections with 1% Annual Chance
Water Surface Elevation (BFE)
{8 - - - - - - Coastal Transect
\— - - -- - Coastal Transect Baseline
- -- Profile Baseline
Hydrographic Feature
OTHER Limit of Study
FEATURES Jurisdiction Boundary
For information and questions about this map, available products associated with this FIRM including
historic versions of this FIRM, how to order products or the National Flood Insurance Program in general,
please call the FEMA Map Information eXchange at 1-877-FEMA-MAP (1-877-336-2627) or visit the FEMA Map
Service Center website at http://msc.fema.gov. An accompanying Flood Insurance Study report, Letter of Map
Revision (LOMR) or Letter of Map Amendment (LOMA) revising portions of this panel, and digital versions of this
FIRM may be available. Visit the North Carolina Floodplain Mapping Program website at http://www.ncfloodmaps.com
or contact the FEMA Map Service Center.
Communities annexing land on adjacent FIRM panels must obtain a current copy of the adjacent panel as well as
the current FIRM Index. These may be ordered directly from the Map Service Center at the number listed above.
For community and countywide map dates refer to the Flood Insurance Study report for this jurisdiction.
To determine if flood insurance is available in the community, contact your Insurance agent or call the National
Flood Insurance Program at 1-800-638-6620.
Base map information shown on this FIRM was provided in digital format by the North Carolina Floodplain
Mapping Program (NCFMP). The source of this information can be determined from the metadata available in the
digital FLOOD database and in the Technical Support Data Notebook (TSDN).
ACCREDITED LEVEE NOTES TO USERS: If an accredited levee note appears on this panel check with your local
community to obtain more information, such as the estimated level of protection provided (which may exceed the
1-percent-annual-chance level) and Emergency Action Plan, on the levee system(s) shown as providing protection.
To mitigate flood risk in residual risk areas, property owners and residents are encouraged to consider flood
insurance and floodproofing or other protective measures. For more information on flood insurance, interested
parties should visit the FEMA Website at http://www.fema.gov/business/nfip/index.shtm.
PROVISIONALLY ACCREDITED LEVEE NOTES TO USERS: If a Provisionally Accredited Levee (PAL) note
appears on this panel, check with your local community to obtain more information, such as the estimated level of
protection provided (which may exceed the 1-percent-annual-chance level) and Emergency Action Plan, on the
levee system(s) shown as providing protection. To maintain accreditation, the levee owner or community is
required to submit the data and documentation necessary to comply with Section 65.10 of the NFIP regulations.
If the community or owner does not provide the necessary data and documentation or if the data and documentation
provided indicates the levee system does not comply with Section 65.10 requirements, FEMA will revise the flood
hazard and risk information for this area to reflect de -accreditation of the levee system. To mitigate flood risk in
residual risk areas, property owners and residents are encouraged to consider flood insurance and floodproofing
or other protective measures. For more information on flood insurance, interested parties should visit the FEMA
Website at http://www.fema.gov/business/nfip/index.shtm.
LIMIT OF MODERATE WAVE ACTION NOTES TO USERS: For some coastal flooding zones the AE Zone
category has been divided by a Limit of Moderate Wave Action (LiMWA). The LiMWA represents the approximate
landward limit of the 1.5-foot breaking wave. The effects of wave hazards between the VE Zone and the LiMWA
(or between the shoreline and the LiMWA for areas where VE Zones are not identified) will be similar to, but less
severe than those in the VE Zone.
Limit of Moderate Wave Action (LiMWA)
COASTAL BARRIER RESOURCES SYSTEM (CBRS) NOTE
This map may include approximate boundaries of the CBRS for informational purposes only. Flood insurance is not
available within CBRS areas for structures that are newly built or substantially improved on or after the date(s)
indicated on the map. For more information see http://www.fws.gov/habitatconservation/coastal_barrier.html, the
FIS Report, or call the U.S. Fish and Wildlife Service Customer Service Center at 1-800-344-WILD.
CBRS Area Otherwise Protected Area
Map Projection:
North Carolina State Plane Projection Feet (Zone 3200)
Datum: NAD 1983 (Horizontal), NAVD 1988 (Vertical)
1 inch = 1,000 feet 1:12,000
0 500 1,000
0 150 300
PANEL LOCATOR
Edgecombe
4712
2,000
Feet
Meters
600
4766
4784
4742 1 4762 1 4782 1 5702
Martin
3780 i4700 4720 4740 4760 4780 5700 5720 1 5740
Wilson \ , <
3689 3699 4609 4619 4669 4679 5,649
4628 4648 4688 5608 5628
3'698 4608 4618 4668 4678 :5648 56
�n
4607 4617 4627 4637 4647 4657 4667 4677 4687 4697 5607 5617 5627 5637
5646
4606 4616 4626 4636 4646 4656 4666 4676 4686 4696 5606 5616 5626 5636
4625 4635 4665 4675 4685 4695 5645 51
4644 5604 5624
4634 tic 4664 4674 4684 4694 5644
lie
/z
i
�f 4?569 4579 55p9 5519
Lenoir 4568 4578 4588 ; 5508 5518 5528
Craven1
%
I,Y 4587 4597
4653
4663
4673
4683
4693
5603
5613
5622
15642
4652
4662
4672
4682
4692
5602
5612
l
46�51
4661
4671
4681
4691
)
5600
5620
\5640
�
4650
4660
4670
4680
4690
NORTH CAROLINA FLOODPLAIN MAPPING PROGRAM
NATIONAL FLOOD INSURANCE PROGRAM
cc FLOOD INSURANCE RATE MAP
NORTH CAROLINA -,. PkR �
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o
PANEL 4688 x
oND S�GJ4
ICU FEMA
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�0111 cc Panel Contains:
COMMUNITY CID PANEL SUFFIX
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GREENVILLE, CITY OF 370191 4688 K
PITT COUNTY 370372 4688 K
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MAP NUMBER
3720468800K
EFFECTIVE DATE
07/07/2014