20161258 Ver 1_Shoreline Stabilization_20161221

Abbreviated PCN shoreline New
Johnson, Alan <[e-mail]>
To: "mknhhs@gmail. com" <mknhhs@gmail. com>
Include
$240 fee
Plat of property
Aerial of property
Photo(s) of shoreline/buffer
Simple diagram of work
Copy of 3 applications
I think that does it
$ PAID
Abbreviated PCN shoreline New.docx
138K
Mon, Aug 22; 2016 at 11:27 AM
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State of North Carolina
Department of Environment and Natural Resources
DWIR Division of Water Resources
Division of Water Resources 15A NCAC 02H .0500 — Water Quality Certification, Shoreline Stabilization
FORM: SSGP 10-2013
Shoreline Stabilization Application Form
Three copies of the application (including attachments) and the application fee should be sent
to:
Division of Water Resources
401 & Buffer Permitting Unit
1617 Mail Service Center
Raleigh, NC 27699-1617
I. Applicant Information [15A NCAC 02H .0502(a
1. Owner Information
Name:
Mailing Address:
Telephone Number:Z���1G" �j Fax Number.
E-mail Address: ) %/KA1W,1L.c1_'% (-`111i7i_l .�v4" I j9
2. Agent/ Contact Person Information
A signed and dated copy of the Agent Authorization letter (a form can be downloaded here:
http://www.saw.usace.army.mil/Portals/59/docs/regulatory/regdocs/Permits/SAMPLE AGENT AUTH
ORIZATION FORM.pdf) must be at ched if the Agent has signed this application form.
Name:
Company Affiliation:
Mailing Address:
Telephone Number:
E-mail Address:
Person to receive the Certification Approval:
Number:
I1. Project Information [15A NCAC 02H .0502(a) & (b)]
1. Attach a vicinity map (i.e. street map) clearly showing the location of the property with
respect to local landmarks such as towns, rivers, and roads.
2. Provide a detailed site plan showing property boundaries and proposed locations of
vegetation clearing, structures (buildings, retaining walls, docks, impervious surfaces,
FORM: SSGP 10-2013 Page 1 of 3

etc.), rip rap, excavation or dredging below Full Pond/ Normal Water Level elevations,
and construction access corridors. You may use the diagram provided at the end of this
application form.
3.,"Attach a photograph of the shoreline/ buffer proposed to be stabilized. (Include a scale
of some sort- a yard stick, shovel handle, etc.)
4. Location of the property (where work is to be conducted)
County: l i /-c L'Z ^—' Nearest Town: F%6: �L
Subdivision name or site address (include phase/lot number): /V/ I k(A
Directions to site - please include road names and numbers, landmarks, etc.:
Latitude (in decimal degrees) Longitude (decimal degrees)
5. Describe the existing land use or condition of the site at the time of this application
(residential, undeveloped, etc.):�'4�i<
6. Property size (acres): : " /
7. Lake/ river/ ocean adjacent to property: ��fz
8. Describe proposed work (include discussion as to how hardening of shoreline has been
avoided, or why it is necessary : ` c . Y,� <4r 7"q
r�y��
9. Will work be conducted from land? © From water? ❑
10. Total amount of disturbance (including all excavation, backfill, rip rap, retaining walls, etc.)
below the normal pool lake level/ Normal Water Level in square feet or acres:
//0L)S6F
11. Total amount of disturbance (including all clearing, back fill, excavation, rip rap, retaining
walls, etc.) above the normal pool lake level/ Normal Water Level and 50 feet land -ward in
square feet or acres: ,2'C'= -L F j
12. Please describe the vegetation above the normal pool lake level/ Normal Water Level and
50 feet landward to be impacted (number of trees, for instance): 2 -5,o71?-2-c-x!00 13
&t2 ,,-/� % -,z e_ rzS
Owner/Agent's Signature* Printed Name Date
[15A NCAC 02H .0502(f)]
`Agent's signature is valid only if an authorization letter from the owner is provided.
FORM: SSGP 10-2013 Page 2 of 3
C T_.

Full Pond/
Normal Water Level
Shoreline
Lake
(At Full Pond/ Normal Water Level)
f=
f_.
r ... r''e
Please approximately sketch the following information on this plan (provide dimensions for each
item, such as 10 ft x 100 ft)*:
1. All proposed vegetation clearing
2. Location of rip rap or fill to be placed above the Full Pond/ Normal Water Level elevation
3. Location of rip rap or fill to be placed below the Full Pond/ Normal Water Level elevation
4. Location of any proposed structures such as buildings, retaining walls, docks, etc.
5. Location of any excavation or dredging below the Full Pond/ Normal Water Level elevation
6. Location of construction access corridors
FORM: SSGP 10-2013 Page 3 of 3

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NOTES:
PHYSICAL SURVEY
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FOR
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MICHAEL KIRK
* PROPERTY MAY BE SUBJECT TO RECORDED OR
2559 WILCOX CIRCLE — DENVER, NC
LOT 21, NIXON'S LAKEVIEW LOTS
CATAWBA SPRINGS TOWNSHIP, LINCOLN COUNTY. NC
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UNRECORDED RIGHTS OF WAYS OR EASEMENTS
Course
Bearing
Distance
CHUCK POOVEY, PLS #3762
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NOT OBSERVED
* OWNER TO VERIFY ALL SETBACKS AND ZONING
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P.O. BOX 494 - DENVER, NC 28037
REGULATIONS PRIOR TO ANY PLANNING OR
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THIS PLAT SHOULD NOT BE SCALED OR RELIED
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I, ROBERT J. DEDMON, CER111TIFY THAT THIS PLAT WAS
UPON FOR DESIGN OR CONSTRUCTION WITHOUT
DRAWN FROM AN ACTUAL SURVEY MADE UNDER MY
SUPERVISION (DB 2307, PG 461)(PB C, PG 38); THAT
I
THE RATIO OF PRECISION AS CALCULATED EXCEEDS
A FIELD VERIFICATION OF ALL DIMENSIONS.
1:10,000': THAT THIS PLAT WAS PREPARED IN
ACCORDANCE WITH GS 47-30 AS AMENDED. WITNESS
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MY ORIGINAL SIGNATURE, AUGUST 29, 2016.
* DIGITAL COPIES OF THIS FILE ARE FOR REFERENCE
V 4 3899
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PROFESSIONAL. LAND SURVEYOR LICENSE NO.
ONLY AND MAY NOT BE USED FOR DESIGN WORK.
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CONSULT LINCOLN COUNTY
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PLANNING do ZONING FOR
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APPROXIMATE
BUFFER APPLIES.
100 YEAR
FLOOD UNE
40 0 40 80 120
W AN -01-0
GRAPHIC SCALE - FEET
VICINITY MAP
SITE
WILCOX CIR BASSWOOD
LANE
LES LN
PINE LAKE RD
PHYSICAL SURVEY
I
FOR
.I
MICHAEL KIRK
I
2559 WILCOX CIRCLE — DENVER, NC
LOT 21, NIXON'S LAKEVIEW LOTS
CATAWBA SPRINGS TOWNSHIP, LINCOLN COUNTY. NC
I
I
SCALE: 1 " — 40'
DEDMON SURVEYS
CHUCK POOVEY, PLS #3762
I
ROBERT DEDMON, PLS #3899
3704 NC HIGHWAY ft NORTH
P.O. BOX 494 - DENVER, NC 28037
PHONE: [phone]
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FAX: [phone]
W W W.DEDMONSU RVEYS.COM
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FESSIOSEAL
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ii0���,�ti� SURV��`�Q�.��
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I, ROBERT J. DEDMON, CER111TIFY THAT THIS PLAT WAS
DRAWN FROM AN ACTUAL SURVEY MADE UNDER MY
SUPERVISION (DB 2307, PG 461)(PB C, PG 38); THAT
I
THE RATIO OF PRECISION AS CALCULATED EXCEEDS
1:10,000': THAT THIS PLAT WAS PREPARED IN
ACCORDANCE WITH GS 47-30 AS AMENDED. WITNESS
I
MY ORIGINAL SIGNATURE, AUGUST 29, 2016.
V 4 3899
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PROFESSIONAL. LAND SURVEYOR LICENSE NO.
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SURV. BY: WT
I DRAWN: RD
JOB# WNLV21
40 0 40 80 120
W AN -01-0
GRAPHIC SCALE - FEET
VICINITY MAP
SITE
WILCOX CIR BASSWOOD
LANE
LES LN
PINE LAKE RD

L2
L SQUARED ENGINEERING, PLLC
PO Box 174
Lake Lure, North Carolina 336-977-5212
August 29, 2016
Michael Kirk
New Horizon Hardscapes
170 New Horizon Way
Boone, NC 28607
Re: Segmental Block Retaining Wall Construction
Lake House
Dear Mr. Kirk,
In accordance with you request and authorization the undersigned geotechnical engineer
from L Squared Engineering (LSE) provides construction recommendations for a
segmental block retaining wall that is to be built at your house at the lake. The
recommendations made within this report are based on using Versa -Lok Block or
equivalent, which have the approximate dimensions of 8 inches in height, 18 inches
across the face and at least 11 inches from face to back. It is important to note that
Versa -Lok Block is a "pin type" block assembly where pins are inserted into successive
courses of block. It is also recommended that Mirafi 3xt geogrid, or equivalent, be used.
Recommendations within this report are based on photographs of the area where the wall
is to be installed. It is important to note that the block indicated above is a "standard
unit" with approximately 1 square foot of area at the face. There are larger block, such as
Redi-Rock Block that are 6 square feet at the face. This point is made as the larger block
weights significantly more than standard units, therefore not being as susceptible to wave
action. It is understood that wave action will be from passing boats and heavy storms.
The remainder of this report is based on using standard unit pin type blocks.
Existing Conditions and Proposed Construction
Segmental Block Retaining Wall
Kirk Lake House
1
August 29, 2016

LZ
Based on information presented in the provided photographs it is planned to install the
segmental block retaining wall at or near the shore line. Presently there is a dock that
extends from land into the water. The top of the dock is about 4 feet above the water
surface shown. It is presumed that the wall alignment will be at or near the shore line as
shown in the photographs.
The wall is to provide 5 feet of grade separation. It is important to note that there is a
difference between grade separation and total wall height. Grade separation is the
difference between final grade at the wall face and directly behind the wall. Total wall
height is defined as grade separation plus the amount of wall embedded below finished
grade at the wall face. In this case where the wall provides 5 feet of grade separation
total wall height is about 7 feet as three courses of block are required below finished
grade. Each course of block is 8 inches in height so three courses below grade is
equivalent to 2 feet.
Segmental Block Retaining Wall Recommendations
Included in the appendices of this report are:
• Specifications for segmental block and geognd; Appendix A.
• Installation instructions for segmental block retaining walls; Appendix B.
• Schematic Drawing for vertical placement of geogrid; Appendix C.
The parameters used for selecting material types, quality and quantity are based on the
following assumptions:
• There will be no significant structural loading behind the retaining wall and no
significant up slope.
• The internal angle of friction for the back fill material placed behind the
segmental block retaining wall, into which the reinforcement geogrid will be
placed, is assumed to be at least, 0 = 280.
• Required bearing capacity for foundation block layer soil subgrade will be at
least 2,000 pounds per square foot (psf).
• The newly installed segmental block will be placed to a depth of 2 feet below
finished grade at face of the wall, which is equivalent to 3 courses of block.
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segmental Block Retaining Wall August 29, 2016
Kirk Lake House

L2
• The leveling pad beneath the bottom layer of each segmental block is comprised
of at least 6 inches thick clean uniformly graded stone or adequately compacted
aggregate base course (ABC), when bearing on soil with an adequate bearing
capacity. Place a layer of geotextile fabric equivalent to Mirafi 140N between
stone and soil subgrade. The geotextile fabric must be placed on the bottom and
sides of the stone.
Site Preparation
It is presumed that the lake water level will be lowered during the winter, as is sometimes
done to add storm water runoff storage capabilities. The lowered water surface will
allow for easier (not easy) wall installation. If lowering the lake level doesn't happen the
wall will have to be installed inland from the shore line as protection from wave action
during construction.
The first requirement is to relocate all utilities to a distance of at least 5 feet beyond limits
of all construction and excavation. When found, utilities must be disconnected or
relocated to an appropriate location for future use in such a way as to not incur any
potential of danger to personnel working on this project.
After accommodations of existing utilities is complete, remove the existing dock to a
distance of at least 5 feet from the limits of construction and excavation. This includes
any attachments to the dock and any foundations the piling may have been on.
Then identify the location of the wall alignment. The alignment shall include a wing at
each end that is about 45 degrees from the alignment of the main wall section extended
about 4 feet into the bank. This must be within your property and is intended to help
reduce potential erosion at wall ends. It will require backfilling soil in front of these
portions of the wall and placing stone rip rap against the fill. Fill shall have a finished
grade of 2 Horizontal to I Vertical. After locating wall alignment, excavate a trench into
existing ground to a depth of 30 inches below the level of where water meets the shore.
This is in order to accommodate three courses of bock, a 6 inch stone leveling course,
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Segmental Block Retaining Wall August 29, 2016
Kirk Lake House

L2
including the installation of geotextile material that is to be placed between the exposed
soil subgrade and stone leveling course.
It will be necessary to excavate into the existing shore a distance of 9 feet from the back
of the new segmental block alignment. This will be necessary to install geogrid behind
the wall. It should be planned to excavate horizontally into the slope at an elevation
equal the top of the first course of segmental block to a distance of 9 feet. From that
point the excavation will have an upward slope of 1 Horizontal to 1 Vertical (1H: 1V)
until the cut slope intersects existing terrain in order to comply with OSHA regulations as
further described below.
Where excavations are anticipated for the proposed segmental block wall installations,
shoring and bracing or flattening (laying back) of the slopes may be required to obtain a
safe working environment. Excavations should be sloped or shored in accordance with
local, state and federal regulations, including OSHA (CFR Part 1926) excavation and
trench safety standards. It is recommended that all excavated soils be placed away from
the edges of the excavation at a distance equaling or exceeding the depth of the
excavation. In addition, surface runoff water should be diverted away from the crest of
the excavated slopes to prevent erosion and sloughing.
Localized areas of soft or unsuitable soils not detected may be encountered once
construction begins. Vertical cuts in these soils may be unstable and may present a
significant hazard because they can fail without warning. Therefore, temporary
construction slopes greater than 4 feet high should not be steeper than one horizontal to
one vertical (1H: 1V) and excavated material should not be placed within 10 feet of the
crest of any excavated slope.
Unbraced excavations may experience some minor localized instability (i.e., sloughing).
To reduce potential sloughing, excavated slopes should be covered with plastic for
protection from rainfall and moisture changes. It should be emphasized that continuous
observations by contractor personnel are important during trenching or excavation
operations at the site.
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Segmental Block Retaining Wall August 29, 2016
Kirk Lake House

L2
Segmental Block Installation
Install segmental block as shown in attachment B.
Geogrid Placement
Based on the above information it is recommended to use Mirafi 3xt Geogrid, or
equivalent. All geogrid shall be extended for a distance equal to the height of the wall at
any location. In example, where the retaining wall provides 5 feet of grade separation
and will be about 7 feet in total height. All geogrid shall be extended for a distance of
approximately 7 feet from the back of wall. Similarly, where the retaining wall provides
3 feet of grade separation and will be 5 feet in total height, all geogrid shall extend
approximately 5 feet from the back of wall. The length of geogrid will change as the
total height of wall changes. It is suggested that geogrid be obtained in 6 feet wide rolls
and changes in wall height be incremented every 6 feet as well in order to reduce any
complications of geogrid installation.
Geogrid shall be placed between the first and second course of block and between
every second course thereafter.
Wall construction will conform to the recommendations presented in Appendix B of this
report as well as additional recommendations presented below.
Rarkfill
Where soil is to be used as backfill it should be free of any organic matter. Soil types for
backfill should be silty sand (SM) or sandy silt (ML), which are common to the area.
The existing materials that are to be removed as indicated above may be reused as back
fill if it is either or both of these types of soil. Soil types that specifically should not be
used as backfill for retaining walls are clayey or silty soils that exhibit plasticity (CL, CH,
MH or OH soils). In addition quarry stone or quarry screening may also be used as
backfill.
After site grading to the limits recommended has been performed, the geotechnical
engineer should evaluate the exposed subgrade to determine if it is competent to support
5
Segmental Block Retaining Wall August 29, 2016
Kirk Lake House

L
the required fill and retaining wall. A bearing capacity of 2,000 pounds per square foot
(psf) is required. If any soft areas of soil are detected remedial actions may be required
such as additional undercutting and replacing with adequately placed and compacted fill
or use of stone and geo-synthetic materials, at the engineer's discretion.
Suitable backfill material should be placed in 8 to 10 inch loose lifts and mechanically
compacted to at least 95% if the soil's maximum density as determined by the Standard
Proctor Test, ASTM Procedure D 698. Compaction may be achieved with a self-
propelled vibratory sheep's foot type soil compactor.
It is important to place fill, regardless if it is stone or soil, in generally horizontal lifts in
such a way that the corresponding upper surface of progressive fill placement will be
essentially equivalent to successive layers of geogrid. This is to facilitate the horizontal
placement of geogrid at the elevations and lengths required and indicated above. If there
is any curvature of the retaining wall it is possible that adjacent layers of geogrid at the
same elevation may overlap. Do not allow adjacent layers of geogrid to touch or
directly overlap but place approximately 3 inches of adequately compacted soil between
them.
It is also important that any exposed soil be immediately covered with erosion control
measures once finished grade is achieved, except areas that are to be paved. Erosion
control measures may include grassing, mulching, hydro -seeding, placement of excelsior
matting impregnated with grass seed and fertilizer or stone riprap. A local landscape
architect or person knowledgeable should be contacted in order to determine the most
efficient methods of quickly attaining 100% coverage of grass or vegetative erosion
control.
Wall Drainage Blanket
It is recommended a drainage blanket be placed behind the entire back surface of the
retaining wall. The drainage blanket should be approximately 1 foot thick and comprised
of clean uniformly graded #57 stone. Near the bottom of the stone drainage blanket a
6
Segmental Block Retaining Wall August 29, 2016
Kirk Lake House

L2
It is important to place a safety barrier along the top of wall in order to help prevent
anyone from going over the top of wall. This can be accomplished by installing a fence
or barricade. Fences or barricades may be placed directly behind the wall. Types of
fences or barricades may be selected at the owner's discretion and installed by the
contractor.
Quality Control
In order to help ensure that recommendations for construction of the retaining wall and
associated elements of this project are adequately performed the following quality control
measures are strongly recommended. If recommendations presented within this report
are not followed there can be no assurance of the performance of the retaining wall. ,
• Field-testing of the soil subgrade beneath the foundation layer of block to
determine that the required bearing capacity of 2,000 pounds per square foot is
available.
• Periodic evaluation of fill and stone to determine if required levels of compaction
are being achieved.
• Periodic observation of block and geogrid installation to help ensure their proper
placement.
It is important to note that some code enforcement jurisdictions require full time
monitoring of segmental block retaining wall construction or a letter of certification by
the engineer after the retaining wall has been constructed. If either is required it is
mandatory that testing of backfill and observations of grid installation be performed.
It is also important to note that LSE did not perform a subsurface exploration at this
location. Therefore, conditions below the existing ground surface at this location may
exist that could adversely affect intended construction. If any unanticipated conditions
are encountered during installation of the retaining wall it should be brought to the
immediate attention of the undersigned in order for additional conditions specific
recommendations to be provided.
Start work only after all applicable permits have been obtained.
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Segmental Block Retaining Wali August 29, 2016
Kirk Lake House

DWGA 8.29.16
Segmental Block Retaining Wall
Schematic Drawing -Not to Scale
Placement of Geogrid
At wall face Geogrid equivalent to Mirafi 3xt
There are details related to retaining wall construction that have been purposely left off of
this drawing including but not limited to the drainage blanket at the rear of the wall, wall
batter and the leveling pad with stone and geotextile fabric. This drawing must be used in
conjunction with the associated LSE report of 8.29.16 and its appendices.