20101031 Ver 1_More Info Received_20101221

Dennison, Laurie
From: Terry Allen [[e-mail]]
Sent: Tuesday, December 21, 2010 6:21 PM
To: Barnett, Kevin; 'Terry Allen'
Cc: 'Crumbley, Tyler SAW'; McHenry, David G.; 'Ian McMillan'; Dennison, Laurie; Boyer, Janet;
Koontz, Charles; Wait, Jeff
Subject: RE: Lake Toxaway projects
Attachments: ATTACHMENT 1 - TEAE Project List.pdf; ATTACHMENT 2 - Site Plans.pdf
Mr. Barnett:
Thank you for your timely review of the PCNs. I have copied your comments below along (shown in
italics) with my responses in RED. Please give me a call or drop me an email if you need additional
information:
1. Location maps are inadequate to find the property from. Additionally, driving directions would
be helpful. - I have mailed you a large copy of the Lake Toxaway Estates Map (copies also
mailed to Mr. Crurnbley & Mr. McHenry). All the street names and lot numbers are shown on
this map. Included with the map is a Project List that identifies all the projects that I am
currently working on along with the corresponding Lot Numbers. Each Lot Number can be
found on the Map. A copy of my Project List is also provided in Attachment 1. Please
consider the Map the "Vicinity Map" for all my Toxaway Projects.
2. No plan view to clearly identify the location on the property where the work would be occurring.
- A site plan for each project is provided in Attachment 2. The projects limits have been
marked on the site plans.
These two items should be submitted as addendums to the previously submitted applications. - In the
interest of time, please consider the above information as addendums for the respective PCN forms.
Presently, the lake level is down approximately 3.5 FT below the normal pool elevation. The plan is
to draw the lake level down to about 7 FT below normal pool. There will be a short construction
period to perform the shoreline work before the lake will need to be filled to avoid costly impacts to
the businesses around the Lake.
The following ENGINEER'S SITE ASSESSMENT NOTES shall apply each specific project as
referenced:
ENGINEER'S SITE ASSESSMENT NOTES
1. The shoreline improvement projects at Lake Toxaway are to be performed during the lake
draw down scheduled for the winter of 2010-2011. This will allow the work to be performed "in
the dry" and minimizing contact with surface water. Working "in the dry" will be much more
cost effective that performing shoreline improvements while the lake is at normal pool
elevation. The last lake draw down occurred in 1990. The next scheduled draw down may be
2021 or beyond.
2. SEAWALL DESIGN: Where the slope of the existing bank is steeper than the natural angle-of-
repose of the insitu material (31-1:11V), the seawall shall be designed as a retaining wall.
Pursuant to Section R404.1.3 of the NC Residential Building Code, walls supporting more than
48-inches of unbalanced fill that do not have permanent lateral support at the top and bottom
shall be designed by a NC Registered Professional Engineer. This includes retaining walls
located on residential sites and any retaining wall systems that cross over property lines
regardless of vertical height. Any existing walls that do not meet Building Code requirement
and/or are not designed in accordance with standard engineering practices are not suitable to
protect property.
3. TYPE 1 DETERIORATION, EXISTING DRY STACK STONE WALL: The existing wall is a
basic gravity wall without mortar. There is no geotextile fabric to retain the fines behind the
all. There is not adequate drainage to relieve hydrostatic pressure behind the wall. The wall is
failing or has less than 20% design life.
4. TYPE 2 DETERIORATION, EXISTING STONE & MORTAR WALL: The existing wall is a
basic gravity stone & mortar mortar. There is no geotextile fabric to retain the fines behind the
all. There is not adequate drainage to relieve hydrostatic pressure behind the wall. Mortar in
joints is failing. The wall is failing or has less than 20% design life.
• Jim McNatt (90 Redbird Circle)
Stated purpose is to install 130 linear feet of seawall. On-site inspection shows an
existing seawall is already in place, and while maintenance is necessary, replacement is
i ° _ 1014 not needed. Please explain why a new wall is necessary. - A new seawall is needed to
protect private property. The existing seawall is in poor condition and does not have
adequate structural capacity to resist lateral earth pressure, hydrostatic pressure or
continued weathering. The existing wall does not meet minimum engineering standards
or Code requirements. The next opportunity to perform major repairs "in the dry" will be
beyond the estimated design life of the existing wall. See Engineers Notes 1, 2, & 4.
• McNatt Family (102 Redbird Circle)
Stated purpose is to install 143 linear feet of seawall. Trout Buffer has already been
cleared, and shoreline has been disturbed with mechanized equipment. Rip-rap is
I'D- 1013 already in place, and there does not appear to be an erosion problem. Please explain
why a new wall is necessary. - The riprap is actually the remains of an old dry stack
stone wall that has collapsed. A new all is necessary to prevent erosion and protect
private property. See Engineers Notes 1 & 2.
• Stephen and Margaret Dana (2912 West Club Blvd)
Stated purpose does not identify linear footage of sea wall to be constructed. There is
an existing seawall already in place, and while maintenance is necessary, replacement
1 ° - 2 8 is not needed. Please explain why a new wall is necessary. - A portion of the existing
wall near the boathouse has collapsed. A new wall is needed to protect property and to
prevent erosion. See Engineers Notes 1, 2, & 4.
• Dale Harmon (2924 West Club Blvd)
o Application lacks stated description of seawall work to be performed (B. 3. e.). There is
an existing seawall in place, and while repairs /maintenance is necessary, replacement
I o - D B lov is not needed. Please explain why a new wall is necessary. - Mortar joints are
deteriorated. - A new seawall is needed to protect private property. The existing
seawall is in poor condition, mortar joints are deteriorating. The next opportunity to
perform major repairs "in the dry" will be beyond the estimated design life of the existing
wall. See Engineers Notes 1, 2, & 4.
• Bobby and Dell Rearden (3432 West Club Blvd)
Ifl- 1031 2
o Application lacks stated description of seawall work to be performed (B. 3. e.). There is
an existing seawall in place, and while repairs / maintenance is necessary, replacement
is not needed. Please explain why a new wall is necessary. - A new seawall is needed
to protect private property. The existing seawall is in poor condition. The next
opportunity to perform major repairs "in the dry" will be beyond the estimated design life
of the existing wall. See Engineers Notes 1, 2, & 4.
o Excavation is stated in project description, but location of excavation has not been
identified. - Sediment removal is planned for the area immediately adjacent to the
dock.
• Raymond Property (4026 West Club Blvd)
Application lacks stated description of seawall work to be performed (B. 3. e.). There is
an existing seawall in place, and while repairs /maintenance (back filling and filter
10-1041 fabric) is necessary, replacement is not needed. Please explain why a new wall is
necessary. - The existing boulder wall has failed. The existing wall does not meet
minimum engineering standards or Code requirements. The next opportunity to perform
major repairs "in the dry" will be beyond the estimated design life of the existing wall.
See Engineers Notes 1, 2, & 4. This wall exceeds 4 FT in height, therefore Bldg Code
requirements apply, wall replacement needed.
o It should also be noted that pre-cast concrete blocks have been delivered on-site.
Should pre-cast concrete blocks be determined appropriate and approved, the Division
of Water Quality requests that Class B rip-rap be placed at the lake ward side of the wall
to dissipate energy and provide habitat. Plan details should reflect this. - Energy
dissipators are not needed provided the wall is built in accordance Sheet C-3 or other
accepted engineering practices. It is requested that DWQ not require riprap for fish
habitat as no such structures were required for other property owners around the lake.
Also, the Toxaway Association has provided additional habitat throughout the lake.
• Scott and Anne Perper (1803 (Cold Mtn Rd)
Stated purpose is to install 270 linear feet of seawall. On-site inspection shows an
existing seawall is already in place, and appears to be in good shape. Please explain
i O - t o3 o why a new wall is necessary. - An existing seawall exists along a portion of the
waterfront. Approximately 120 L.F of lake frontage has no seawall. The existing wall
shows signs of deterioration at various locations. Although, some portions of the
existing wail may not be replaced, the 401/404 is requested for the entire waterfront to
insure that all suspect areas can be repaired or replaced. See Engineers Notes 1, 2, &
4.
• Kapp Property (763 Blue Ridge Rd)
o Stated purpose is to install 70 linear feet of seawall. On-site inspection shows an
existing seawall is already in place, and while repair is necessary, replacement is not
needed. Please explain why a new wall is necessary and explain why proposed
1 O - 1 o a seawall would not follow existing shoreline. - A portion of the existing wall has
collapsed. A new seawall is needed to protect private property. The existing seawall
does not have adequate structural capacity to resist lateral earth pressure, hydrostatic
pressure or continued weathering. The existing wall does not meet minimum
engineering standards or Code requirements. The next opportunity to perform major
repairs "in the dry" will be beyond the estimated design life of the existing wall. See
Engineers Notes 1, 2, & 4.
• Elizabeth Glazebrook (716 N. East Shore Rd)
o Stated purpose is to install 393 linear feet of seawall. On-site inspection shows an
existing seawall is already in place, and while maintenance is necessary (install
° drainage through wall and back fill with stone), replacement is not needed. Please
explain why a new wall is necessary. - There are significant sink holes behind the wall
at various locations. The existing stone wall has failed and material loss is occurring.
The existing wall does not meet minimum engineering standards or Code
requirements. See Engineers Notes 1, 2, & 4. This wall exceeds 4 FT in height and it
crosses a property line, therefore Bldg Code requirements apply, wall replacement
needed. Please see the last two sheets of Attachment 2 for the Glazebrook Site Plans
for both parcels. According to Mr. Edwards (DWQ), only one PCN is required since the
parcels are adjacent.
In general, most of the existing seawalls that I have examined are not code compliant and should not
be relied upon to protect a structure. Although, I can understand that you may not have an issue from
a Water Quality point-of-view.
I noticed that Dr. Johns PCN was not addressed in your comments. This was the first PCN that I
mailed in. Please check to be sure you have it.
As always, your timely review of all PCNs is appreciated. All the projects shown in my Project List
(Attachment 1) have been mailed to you. You should be receiving the last several PCNs shortly.
It appears that I have prepared PCNs for about a third of the projects around the lake. I assume that
you are receiving applications (prepared by others) for the remaining two-thirds of the projects.
Thank you.
Terry Allen, PE
T.E. ALLEN ENGINEERING, PC
P.O. Box 103
Rosman, NC 28772
828-877-4883
828-553-3004 Cell
From: Barnett, Kevin [mailto:kevin.barnettOncdenr.gov]
Sent: Friday, December 17, 2010 4:40 PM
To: Terry Allen
Cc: Crumbley, Tyler SAW; McHenry, David G.; Ian McMillan; Dennison, Laurie; Boyer, Janet; Koontz, Charles; Wait, Jeff
Subject: Lake Toxaway projects
Good Afternoon Mr. Allen:
I have reviewed all of the submitted applications that I have received and wanted to bring up some points / issues with
the applications:
1. Location maps are inadequate to find the property from. Additionally, driving directions would be helpful.
2. No plan view to clearly identify the location on the property where the work would be occurring.
These two items should be submitted as addendums to the previously submitted applications.
Project specific comments for individual applications:
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