Summer 2019 Seawall Reconstruction Presentation 2019 NVC Annual - - PowerPoint PPT Presentation

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Summer 2019 Seawall Reconstruction Presentation 2019 NVC Annual - - PowerPoint PPT Presentation

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Summer 2019 Seawall Reconstruction Presentation 2019 NVC Annual Meeting Article No. 7 Seawall repair/replacement. To see if the Northport Village Corporation will vote to authorize a majority of the Overseers of the Corporation to borrow on

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SLIDE 1

Summer 2019 Seawall Reconstruction Presentation

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SLIDE 2

2019 NVC Annual Meeting Article No. 7

  • Seawall repair/replacement. To see if the Northport Village Corporation will

vote to authorize a majority of the Overseers of the Corporation to borrow on behalf of the Northport Village Corporation a principal amount not to exceed $1,600,000, and to issue and sell general obligation bonds or notes of the Northport Village Corporation for that purpose to fund the repair / replacement

  • f the seawalls extending from the boat ramp to the far side of the yacht club

which protect the shoreline, causeway, and sewer treatment building and related site work. Such bonds and notes to be issued upon such further terms or conditions as may be determined by a majority of the Overseers of the Northport Village Corporation, and further to authorize the overseers to accept and expend federal or state grants, execute any and all contracts and documents and take any and all actions necessary or convenient to issue the bonds or notes

  • f the Northport Village Corporation and accomplish the Project.
  • f the Northport
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SLIDE 3

Seawall Discussions Prior to 2019…..

  • Discussion going on for 10+ years
  • Previous design more than 5 years ago

by wharf designer was rejected as not considering all options

  • 2016 inspection report….”useable but

decaying condition”…”hesitant” to provide a life expectancy because of storm potential

  • 2016 report introduced options A-H

2016 report in

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SLIDE 4

2016 Options A-H, plus “I” - Hybrid

  • Looked at Option A – “Do nothing”
  • Eventually crib will disintegrate and erode to an

approximate slope of 4-6:1. Even at 6:1 it will not be stable and subject to future erosion

  • issues. At 6:1 the erosion will eat into about 50

feet into the park and inhibit access to the causeway, if it is not destroyed as well.

  • Option A – not recommended
  • Options B, D, E, F, G, H, & I – carried forward
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SLIDE 5

Design Team – Multiple Specialists

  • Milone and

MacBroom

  • Landmark

Corporation Surveyors & Engineers

  • Pinnacle

Engineering

  • Prock Marine

Prock Marine

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SLIDE 6

Design – Comparison of Relative Costs

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SLIDE 7

Design – Comparison of Relative Costs

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SLIDE 8

Design – Comparison of Relative Costs

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SLIDE 9

Recommended Alternative in 2018

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SLIDE 10

NVC 2018 Annual and Subsequent Meetings

  • Some prefer

a vertical wall option even if it will cost more

  • Carried two

designs to 50% in 2019

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SLIDE 11

2019 Seawall 50% design

  • Looked at “revetment”

and “seawall” options

  • Considered capital

costs, life expectancy

  • Examined how it would

fit into the existing Infrastructure

  • Developed Article of

Annual Meeting Annual Meetin

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SLIDE 12

Background Terms

  • Define “Seawall”
  • Define “Revetment”
  • Define “Long-Lasting”
  • Define “Site Design”
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SLIDE 13

Background Terms

  • Define “Seawall”
  • Define “Revetment”
  • Define “Long-Lasting”
  • Define “Site Design”
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SLIDE 14

Seawall in Ruggles Park

  • Often think of seawall as the

vertical wooden wall(s) by ramp

  • In reality, A seawall is anything

that is used to “wall-off” the land from the sea

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SLIDE 15

Background Terms

  • Define “Seawall”
  • Define “Revetment”
  • Define “Long-Lasting”
  • Define “Site Design”
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SLIDE 16

Background Terms

  • Define “Seawall”
  • Define “Revetment”
  • Define “Long-Lasting”
  • Define “Site Design”
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SLIDE 17

Revetment Definition

  • re·vet·ment (n) a retaining wall
  • r facing of masonry or other

material, supporting or protecting a rampart, wall, etc.

  • All “seawalls” are “revetment”
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SLIDE 18

Background Terms

  • Define “Seawall”
  • Define “Revetment”
  • Define “Long-Lasting”
  • Define “Site Design”
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SLIDE 19

Background Terms

  • Define “Seawall”
  • Define “Revetment”
  • Define “Long-Lasting”
  • Define “Site Design”
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SLIDE 20

“Long-Lasting” Definition

  • Wood walls 25+ years
  • Granite walls w/ pins 50+ years
  • Rip-rap 50+ years
  • Maintenance different on each
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SLIDE 21

Background Terms

  • Define “Seawall”
  • Define “Revetment”
  • Define “Long-Lasting”
  • Define “Site Design”
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SLIDE 22

Background Terms

  • Define “Seawall”
  • Define “Revetment”
  • Define “Long-Lasting”
  • Define “Site Design”
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SLIDE 23

“Site Design” Work

  • The circle will needed to be rebuilt
  • Wooden wall is actually a crib and

buried into the hill

  • The vertical boards are nailed into

the crib

  • At least half of the circle will be torn

up to remove the old cribbing buried behind the vertical boards

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SLIDE 24

“Site Design” Work

  • Approximate minimum limits of site staging area/reconstruction area
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SLIDE 25

“Site Design” Work

  • The Selected Pre-

Design – Option 3 from last summer includes:

  • Parking,
  • Sitting area, &
  • Accommodates

either the vertical or sloped wall sloped wall

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SLIDE 26

“Site Design” Work

  • Pre-design did

not include any significant grading yet

  • Therefore, no

additional consideration for land based runoff erosion

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SLIDE 27

“Site Design” Work

  • Currently no storm drains in the

staging area, none below circle

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SLIDE 28

“Site Design” Work

  • Runoff overflows current wall, boat ramp, northern kneewall, and rip-rap
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SLIDE 29

“Site Design” Work

  • Current,

Existing Conditions

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SLIDE 30

“Site Design” Work

  • Future,

Sloped

Revetment Conditions

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SLIDE 31

“Site Design” Work

  • Future,

Vertical

Revetment Conditions

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SLIDE 32

Vertical Wall Design Plan, Elevation & Cross Section

  • Plan
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SLIDE 33

Vertical Wall Design Plan, Elevation & Cross Section

  • Plan
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SLIDE 34

Vertical Wall Design Plan & Cross Sections

  • Plan
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SLIDE 35

Sloping Wall Design Plan & Cross Sections

  • Plan
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SLIDE 36

Sloping Wall Design Plan & Cross Sections

  • Plan
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SLIDE 37

Final Design Details Remaining

  • Design at 50%
  • Conditions still

TBD in final design are “circled” in grey

  • The arrow

points to Pandora’s Box

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SLIDE 38

Extent of Work

  • How does the

new wall fit into the existing causeway “Wall”?

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SLIDE 39

Extent of Work

  • How does the

new wall fit into the existing causeway “Wall”?

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SLIDE 40

Extent of Work

  • Looks like

granite wall from the top

  • Eroding and

collapsing

  • No way to tie

in new wall

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SLIDE 41

Extent of Work

  • How does the

new wall fit into the existing causeway “Wall”?

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SLIDE 42

Extent of Work

  • How does the

Southside of the causeway compare to the north?

  • Even more

bowed and problematic

  • More rock

settlement settlement

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SLIDE 43

Extent of Work

  • How does the

Southside of the causeway compare to the north?

  • Even more

bowed and problematic

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SLIDE 44

Extent of Work

  • How does the

Southside of the causeway compare to the north?

  • Even more

bowed and problematic

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SLIDE 45

Extent of Work

  • How does the

Southside of the causeway compare to the north?

  • Even more

bowed and problematic

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SLIDE 46

Extent of Work

  • How does the

Southside of the causeway compare to the north?

  • Even more

bowed and problematic

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SLIDE 47

Extent of Work

  • How does the

Southside of the causeway compare to the north?

  • Even more

bowed and problematic

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SLIDE 48

Extent of Work

  • How does the

Southside of the causeway compare to the north?

  • Even more

bowed and problematic

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SLIDE 49

Extent of Work –Piling Option?

  • Driven in to hold back land
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SLIDE 50

Extent of Work – What do we want?

  • How does the

Southside of the causeway compare to the north?

  • Even more

bowed and problematic

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SLIDE 51

Extent of Work – What do we want?

  • How does the

Southside of the causeway compare to the north?

  • Even more

bowed and problematic

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SLIDE 52

Extent of Work – What do we want?

  • How does the

Southside of the causeway compare to the north?

  • Even more

bowed and problematic

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SLIDE 53

Extent of Work – What do we want?

  • How does the

Southside of the causeway compare to the north?

  • Even more

bowed and problematic

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SLIDE 54

Extent of Work – What do we want?

  • How does the

Southside of the causeway compare to the north?

  • Even more

bowed and problematic

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SLIDE 55

Alternatives Considered and Potential Costs

  • How does the

Southside of the causeway compare to the north?

  • Even more

bowed and problematic

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SLIDE 56

2019 NVC Annual Meeting Article No. 7

  • Seawall repair/replacement. To see if the Northport Village Corporation will

vote to authorize a majority of the Overseers of the Corporation to borrow on behalf of the Northport Village Corporation a principal amount not to exceed $1,600,000, and to issue and sell general obligation bonds or notes of the Northport Village Corporation for that purpose to fund the repair / replacement

  • f the seawalls extending from the boat ramp to the far side of the yacht club

which protect the shoreline, causeway, and sewer treatment building and related site work. Such bonds and notes to be issued upon such further terms or conditions as may be determined by a majority of the Overseers of the Northport Village Corporation, and further to authorize the overseers to accept and expend federal or state grants, execute any and all contracts and documents and take any and all actions necessary or convenient to issue the bonds or notes

  • f the Northport Village Corporation and accomplish the Project.
  • f the Northport
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SLIDE 57

2019 NVC Annual Meeting Article No. 7

Financial Statement 1. Total Village Indebtedness

  • A. Total bonds outstanding and unpaid as of 12/31/2019

$ 1,173,406

  • B. Total bonds authorized and unissued

$ 952,000

  • C. Bonds to be issued if this article is approved

$ 1,600,000 TOTAL $ 3,725,406 2. Costs

At an estimated rate of 4.0% for a term of 30 years, the estimated costs

  • f this bond issue will be:

Principal: $ 1,600,000 Interest: $ 1,175,845 Total Debt Service: $ 2,775,845

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SLIDE 58

2019 NVC Annual Meeting Article No. 7

Why such a heavy duty project that costs $1,600,000? The simple answer is present-worth math…..

  • Scenario 1 – granite sloped/vertical wall whole wall - 50+ year life
  • $1.6 million today @ 4% for 30 years = $2.2 million (today’s dollars @ 3%

inflation)

  • Scenario 2A – Wood wall only replacement, 25+ year life x 2
  • $0.5 million today + $0.9 million in 25 years @ 4% for 20 years = $1.5 million

(today’s dollars)

  • Scenario 2B – WWTP shore and causeway repair in 10 years – 50+ year life
  • $0.8 million @ 6% interest for 30 years = $1.2 million (today’s dollars)

$0.8 million @

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SLIDE 59

2019 NVC Annual Meeting Article No. 7

Comparison of Scenario 1 versus Scenarios 2A and 2 B

  • Not included in Scenario 2A/2B are any unknown construction costs for the wood

rebuild in 25 years, and the causeway/wastewater treatment needs in ~10 years

  • Different permitting restrictions
  • Different materials of construction
  • Different construction requirements
  • In Scenario 2B any areas not addressed today will continue to erode which would

likely add additional scope of work even without changes in permit/construction

  • In Scenario 2A/2B, the NVC takes on greater risk for erosion – while minor erosion is
  • ften fixed annually by our spring roadwork crew, a major change in shoreline from

a large erosion event would likely be considered permanent by the U.S. Army Corps. a large erosion

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SLIDE 60

2019 NVC Annual Meeting Article No. 7

Comparison of Scenario 1 versus Scenarios 2A and 2 B

  • Scenario 1 has 1 construction window, 1 permitting exercise, and 1 site work project
  • Scenarios 2A and 2B have 3 construction windows, 3 permitting windows, 3

different site repair projects

  • These costs are not directly included in the present worth calculation as a multiple of 3
  • Furthermore, it is very possible that these costs will rise more than inflation in the future
  • Present Worth of Scenario 1 is $2.2 Million and Scenarios 2A and 2B are at least

$2.7 million, plus unknowns

  • In today’s dollars, we will save at least $0.5 Million (plus unknown future costs by

doing all the work together as one project g

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SLIDE 61

2019 NVC Annual Meeting Article No. 7

Immediate Financial Tax Implications from NVC Treasurer

  • With an assumption is borrowing $1.6M, for 30-year term at an

estimated rate of 4% interest:

  • Would result in a total interest of $1.2M.
  • Would result in an annual payment of approximately $92K.
  • The current thinking is that NVC would issue a bond to cover the

construction expense. The bond payments would be made partly from a tax increase and partly from use of reserves for the first 4 years of the bond.

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SLIDE 62

2019 NVC Annual Meeting Article No. 7

Immediate Financial Tax Implications from NVC Treasurer

  • In 2024 we retire the 2009 waterfront bond, the funds currently

used to pay principal and interest for that bond would be applied to the Seawall bond.

  • From a practical standpoint this approach allows us to fund $20 to

$30K of the bond payment using tax dollars we have already paid into reserves or tax dollars that are already part of our tax bill.

  • The personal impact can be calculated by using a factor of .7712 for

each $1,000 in assessed value.

  • The average home in Bayside is valued at $250K. 250 times .7712 = $193

increase in taxes.

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SLIDE 63

2019 NVC Annual Meeting Article No. 7

Conclusion: The NVC has often been asked throughout this public seawall discussion and design process: “If this were my project, I would simply rebuild the wooden wall, and “save” money, so what is the big deal?” As the previous slides illustrated, the only way to “save” money is to assume that you, or your family, will not own your Bayside cottage in the next 10 to 25 years, so that the deferred added cost will simply be born by the next owner. This is often considered the “hot potato” approach. The NVC Overseers foresee that Ruggles Park and Bayside will be around for 50+ years, and then some, so Scenario 1 is the most fiscally responsible

  • ption to address today’s needs, and those of future generations.
  • ption to addres
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SLIDE 64

2019 Seawall Presentation

Infrastructure Committee