Por tland Har bor Dr e dge and CAD Ce ll Pr oje c t kshop - - PowerPoint PPT Presentation

▶
por tland har bor dr e dge and cad ce ll pr oje c t
SMART_READER_LITE
LIVE PREVIEW

Por tland Har bor Dr e dge and CAD Ce ll Pr oje c t kshop - - PowerPoint PPT Presentation

Aug 07, 2023 288 likes •551 views

Por tland Har bor Dr e dge and CAD Ce ll Pr oje c t kshop South Por tland City Counc il Wor July 2 , 2019 Ag e nda 1. Intr oduc tions 2. Pr oje c t Ne e d 3. CAD Ce ll Ove r vie w 4. Dr e dge Ove r vie w 5. Pe r mitting 6.

slide-1
SLIDE 1

Por tland Har bor Dr e dge and CAD Ce ll Pr

  • je c t

South Por tland City Counc il Wor kshop July 2, 2019

slide-2
SLIDE 2
  • 1. Intr
  • duc tions
  • 2. Pr
  • je c t Ne e d
  • 3. CAD Ce ll Ove r

vie w

  • 4. Dr

e dge Ove r vie w

  • 5. Pe r

mitting

  • 6. Costs and F

unding

  • 7. Sc he dule
  • 8. Disc ussion

Ag e nda

slide-3
SLIDE 3
  • Citie s o f Po rtla nd a nd So uth Po rtla nd
  • T

he Po rtla nd Ha rb o r Co mmissio n

  • Ma ine De pa rtme nt o f T

ra nspo rta tio n

  • F

rie nds o f Ca sc o Ba y

  • T

he Ca sc o Ba y E stua ry Pa rtne rship

  • Pie r a nd Ma rina Owne rs
  • L
  • b ste r a nd F

ishing Co mmunity

  • T

he Wa te rfro nt Allia nc e

  • Ma ine Co ng re ssio na l De le g a tio n

Proje c t Sta ke holde rs, Propone nts a nd Colla bora tion

slide-4
SLIDE 4

Why Dr e dge ?

  • Histor

ic se dime ntation has made por tions of imme diate wate r fr

  • nt unusable
  • Se dime nts not suitable for
  • ffshor

e disposal

  • L

e gac y c ontaminants in se dime nts impac ting be nthic c ommunity and wate r quality

slide-5
SLIDE 5

All harbors needs dredging eventually

Aspasia Marina during an astronomically low tide

Why Dre dg e ?

slide-6
SLIDE 6

Why Dre dg e ?

Over 900 Boat Slips Support multiple yards and boat service businesses South Portland’s vessel berthing assets are a regionally significant resource for boating and access to the water

slide-7
SLIDE 7
slide-8
SLIDE 8

Dre dg e a nd CAD Ce ll Ove rvie w

slide-9
SLIDE 9
  • In 2008 Nor

ma nde a u c omple te d Alte r na tive s Ana lysis. Additiona l a lte r na tive s e va lua te d a s pa r t of 1998 a nd 2013 E nvir

  • nme nta l

Asse ssme nts for Por tla nd Ha r bor Dr e dg e .

  • A CAD Ce ll is the most c ost e ffe c tive a nd e nvir
  • nme nta lly sound

disposa l option.

Why a CAD Ce ll?

Nor mande au 2008

slide-10
SLIDE 10

CAD Ce ll F unda me nta ls

CONCE PT

  • Be twe e n 250,000

and 300,000CY

  • 3:1 Slope in side s
  • ~ 50’ de e p be low

c ur r e nt bottom

slide-11
SLIDE 11

CAD Siting

Criteria Technical considerations (Average)

  • 1. Technical feasibility (CAD construction)
  • 2. CAD Construction Cost
  • 3. Area available for CAD (square footage)
  • 4. Operational efficiency (during use of the CAD)
  • 5. Influences on cap integrity
  • 6. Land title

Environmental/Habitat/Fisheries (Average)

  • 7. Mapped shellfish beds
  • 8. Water Quality (MEDEP rating)
  • 9. Tidal Wading Bird Waterfowl Habitat
  • 10. Lobster fishery (greater the effort the lower the score)

Permitting/Public Feedback/Public Uses (Average)

  • 11. State and Federal Agency feedback
  • 12. Public uses (proximity to residential/recreational uses)
  • 13. Public feedback
  • 14. Navigational impacts (Federal Channel, moorage…)

Scoring

Stakeholder Meeting July 18, 2016

slide-12
SLIDE 12

CAD Ce ll

  • 49 MLLW (with 1FT OD to -

50MLLW) : 278,810 Cubic Yard Capacity 9.5 acres 800’x (400- 600’ wide)

slide-13
SLIDE 13

Ge ote c hnic a l Boring / Sub- Bottom Profiling

slide-14
SLIDE 14

CAD Ce ll Site Conditions

Site Characterization January 2017 Lobster Survey December 2017

slide-15
SLIDE 15

CAD RIM Suitability

Suitability Determination Remaining 14,000 cubic yards Testing requirements

slide-16
SLIDE 16
  • Owne r o utre a c h a nd dre dg e

fe e db a c k

  • 32 pie r/ wa te rfro nt o wne rs
  • Dre dg e fo o tprints/ vo lume s fo r

pe rmitting a nd CAD sizing

  • Ove r ha lf o f c urre nt dre dg e

vo lume fro m So uth Po rtla nd

T a rg e t Dre dg e Are a s

slide-17
SLIDE 17

Dre dg e Site Conditions

slide-18
SLIDE 18

Sa mple lo c a tio ns prio ritize d b a se d

  • n the fo llo wing :
  • Re pre se nta tive dre dg e de pth
  • L
  • c a tio n re la tive to CSO o r

sto rm-wa te r o utfa ll/ histo ric a l use

  • I

nne r a nd o ute r po rtio n o f dre dg e a re a

  • 30 vib ra c o re lo c a tio ns
  • 15 c o mpo site sa mple s

Sa mpling a nd Ana lysis

slide-19
SLIDE 19

Vib ra c o re Sa mpling

slide-20
SLIDE 20

E e lg ra ss Surve ys

slide-21
SLIDE 21

L

  • b ste r Surve ys
slide-22
SLIDE 22
  • Multiple pe r

mitting pr

  • je c t me e tings

with age nc ie s

  • Umbr

e lla pe r mit by the Por tland Har bor Commission for whar ve s and mar inas

  • CAD Ce ll pe r

mit thr

  • ugh the City of

Por tland and South Por tland

  • Subme r

ge d L ands Dr e dge L e ase s

Applic a tions

slide-23
SLIDE 23

Project Costs and Funding

Up to 278,000 cubic yards of material

Approximate Dredge Costs $15,000,000 Approximate CAD Costs $15,000,000

Funding Sources (assumed)

Municipal Funds (Portland and South Portland) Tipping Fees – Private and Public State Transportation Bond Funds Federal “BUILD” Grant (TIGER) Federal Port Infrastructure Discretionary Grant

slide-24
SLIDE 24
  • Pe r

mit submittals- Oc tobe r 2019

  • Pe r

mits r e c e ive d- May 2020

  • BUIL

D gr ant applic ation- July 2020

  • CAD c e ll c onstr

uc tion- winte r 2021/ 2022

  • Har

bor dr e dging- 2022- 2027

Proje c t Sc he dule

slide-25
SLIDE 25

Disc ussion/ Que stions