HomeMy WebLinkAbout20170130_Seawall Repair_12-14-2016~~. WILLIAM SIMPSON & ASSOCIATES, INC. S CONSULTING STRUCTURAL ENGINEERS
23 ORCHARD. SUITE 250 PH. (949) 206-9929
LAKE FOREST, CA 92630 FAX (949) 206-9955
www.w5a5e.com e-m a i I : m a i I@ w 5 a 5 e . com
December 14, 2016
Ian Harrison
3535 east Coast Hwy #301
Corona Del Mar, CA 92625
RE: SEA WALL REPAIR/REINFORCING
2772 Bayshore Drive
Newport Beach, CA 92663
WSA Job #7084
Dear Mr. Harrison,
Pursuant to your request and authorization, William Simpson & Associates, Inc., (WSA) is
pleased to provide this report regarding questions typically asked by California Coastal
Commission related to the current status of existing seawalls.
QUESTION: What is the visual appearance status ofthe seawall?
ANSWER: The exposed elements of the seawall assembly, concrete coping and panels, seem to
be in a good condition for a concrete structure of this vintage.
QUESTION: Will the seawall last for the economic life normally taken to be 75 to 100 years) of
the associated structure (single-family residence)?
ANSWER: From structural engineering stand point the existing seawall should last for the
economic life of the associated structure (single-family residence).
QUESTION: How will the effects of sea level rise impact the seawall?
ANSWER: While sea levels have been rising for decades, higher rates of raise are forecast for
the coming century as a consequence of climate change. Increases can be attributed
to warmer temperatures, which cause water to expand, as well more liquid mass
caused by melting of ice caps. Current estimates of future sea level rise generally
fall in the range of 1-3 ft for the year 2100. A United States Environmental
Protection Agency study puts these figures in a probabilistic perspective, suggesting
there was a 50% chance that sea level rise would exceed 0.4, 0.7 and 1.5 ft by 2025,
2050 and 2100, respectively, and a 10% chance that sea level rise would exceed 0.6,
1.1 and 2.9 ft by 2025,2050 and 2100, respectively. On August 12,2015,
California Coastal Commission unanimously adopted Sea Level Rise
Policy Guidance: Interpretive Guidelines for Addressing Sea Level Rise in
Local Coastal Programs and Coastal Development Permits. According to this
Document, considered The Best Available Science and Consequences of Sea Level
f
PA2017-019
Rise, the sea-level rise projections for California (NRC 2012) are 1, 2 and 5.5 ft by
2030, 2050 and 2100 respectively. The current Highest High Water level in
Newport Beach is +7.8'MLL W. If sea level rises by 5.5' by year 2100, Highest
High Water level will become +13.3'MLLW, which will be higher than the top of
the existing/reinforced seawall of=+ 12.68'NAVD88=+ 12.86'MLLW.
In such a case, the existing seawall will have to be raised in a manner similar to the
one reflected on the enclosed STD-60 1-L in order to accommodate the actual see
level at that time.
QUESTION: What work on the seawall is anticipated to occur to deal with sea level rise?
ANSWER: If sea level rises by 5.5' by year 2100, Highest High Water level will become
+ 13.3 'MLL W, which will be higher than the top of the existing/reinforced seawall
of=+ 12.68'NAVD88=+ 12.86'MLL W. In such a case, the existing seawall will
have to be raised in a manner similar to the one reflected on the enclosed STD-60 1-
L in order to accommodate the actual see level at that time.
QUESTION: When approximately will the seawall need to be repaired or replaced?
ANSWER: As a part of the proposed development on the lot, the seawall wall will be
repaired/reinforced in accordance with the enclosed drawings S-0, S-1 & S-2, in
order to comply with the City of Newport Beach Building Department requirements.
All work shall be done from the land side of the seawall. Once reinforced in
accordance with the aforementioned drawings, no additional repair or replacement
of the seawall shall be anticipated in the next 7 5 to 1 00 years.
The above answers were prepared based on the existing condition, and within the inherent
limitations of this study, in accordance with generally acceptable engineering principles and
practices. We make no further warranty, either expressed or implied.
William Simpson & Associates, Inc. appreciates the opportunity to work with you towards
the successful completion of your project. Should you have any questions regarding this report,
please contact us.
Respectfully submitted,
Plamen Petrov, P.E.
Senior Project Manager
Enclosures:
Seawall Reinforcing Drawings S-0, S-1 & S-2
STD-601-L
Masoud Jafari, S.E.
Principal
PA2017-019
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NEWPORT BEACH, CA 92883
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OWNER / APPUCANT
Mr. Kevin Moriarty
2782 Bayshore Drive
Newport Beech, CA 92663
Phone. 19491 300·0310
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NOTE:
2-#4 CONT. EPOXY-COATED~----.
PER ASTM A934
8" CONCRETE BLOCK WALL ADDED
TO TOP OF EXISTING BULKHEAD
#5 @ 24" O.C. DRILL AND EPOXY BARS PER~--......
MANUFACTURER'S RECOMMENDATIONS INTO
EXISTING COPING
TOP OF IMPROVEMENTS
ALTERNATE "A"
(CONCRETE BLOCK)
11/2" CHAMFER (TYPICAL)----------..
#4 CONT. EPOXY COATED A934 -------......
CONCRETE: f'c = 4,500 PSI (MIN.)---.....,_
W /C RATIO = 0.45 (MAX.)
#5 @ 24" O.C. DRILL AND EPOXY BARS PER
MANUFACTURER'S RECOMMENDATIONS
INTO EXISTING COPING
TOP OF IMPROVEMENTS-----
ALTERNATE "B"
(POURED-IN-PLACE CONCRETE)
EPOXY SHALL CONFORM TO ASTM C881 STANDARD AND BE
USED IN STRICT ACCORD WITH THE MANUFACTURERS PRINTED
INSTRUCTIONS.
PROPERTY, BULKHEAD
OR OTHER BAYWARD
LIMIT
ROUGHEN FOR BOND
AND APPLY EPOXY
EXISTING COPING
EXISTING BULKHEAD
PROPERTY, BULKHEAD
OR OTHER BAYWARD
LIMIT
ELEVATION + 9.0
M.L.L.W.
ROUGHEN FOR BOND
AND APPLY EPOXY
BONDING AGENT PER
MANUFACTURER'S
RECOMMENDATIONS.
EXISTING COPING
0
REV. 11/07 ~
~-------------------------------------------,--~--~~~~~~~~~~~~~~~~ APPROVED: e CITY OF NEWPORT BEACH
BUILDING DEPARTMENT
DETAIL FOR RAISING
BULKHEADS
~
:;_' ~----~~B~UI~LD~IN~1G~D~I~~C~T~OR~----~~I y r-~~~~~~---.-----------------1 ] Drawn: R. OKADA "'
Date: JULY 2004 Scale: N.T.S. ~ ~--~~~~~--~-----------------1 ffi
DRAWING NO. STD-601 -L f ~------------------------------------~--------------------------~
PA2017-019