MATERIAL David M. Griffin, in, P.E. Water erways ys Program - - PowerPoint PPT Presentation

BENEFICIAL USE OF DREDGED MATERIAL

David M. Griffin, in, P.E. Water erways ys Program gram Manager er May 2, 2012

• GD

GDOT OT is s the he Lo Local al Sponsor nsor for the he Atlantic ntic In Intracoas tracoastal al Water terway y and d the he Brunswic nswick k and d Sav avann annah ah Harbor bor Pr Projects jects

• Maint

intena enance nce material terial remo moved ed fr from inner er ha harb rbor

• rs

s annual ually ly (o (on av averag rage) e) Sav Savanna annah: h: 6,000,000 ,000,000 cubi bic c yards ds Brunsw unswic ick: k: 500 00,000 ,000 cubi bic c yards ds

Overview

• Sav

avann annah ah Harbor bor Dredge dge Materia erial l Contain ainment ment Ar Areas as (D (DMCA CAS) S) 7 upland and DMCAs CAs 6,0 ,000 00 acres es in DMCAs CAs 42 2 miles es of f containment ainment dikes es La Largely gely si silt

Overview

• Brunsw

unswic ick k Harbo bor r DMCA CA 1 upl pland and DMCA CA 700 00 acres es in DMCA CA 4 miles es of f containment ainment di dikes es La Largely gely sa sand

Overview

• Pr

Provide vide add dditional itional DMCA CA sto torage rage capa pacity city

• Pr

Provide vide so social ial and/or /or envi nviron ronment ental al be benefi fits

Beneficial Uses

• Dike

e Construction truction

• Roads/P

ads/Pub ublic lic Work rks

• Offshore

shore Bird Is Island, nd, Sav avann nnah ah

• In

Inshore shore Bird d Is Island, and, Brunsw swic ick

• Bric

ick k manufacturing acturing study dy

Beneficial Uses

• Dikes

es are raised sed every y 6-12 2 years s to to provide vide additional dditional di disposal sposal capa pacity ity

• Material

aterial removed ed fr from interio erior r of f DMCA CA to to raise se dikes es

• Typical

pical 6 foot dike e raisi sing ng restores

• res be

between een 5 and d 6 cubi bic c yards ds of f area a capacity acity for each h linear near foot of f di dike

Dike Construction

• Gl

Glynn nn County nty ha harves ests ts sa sand d fr from Brunswic swick DMCA

• Material

aterial mostly tly use sed d as s ba base se material terial for county unty roads ds

• Am

Amount unt removed ed varies es annual ually ly

Roads/Public Works

• Cons

nstruct tructed d offshor shore north th of f ba bar cha hann nnel el

Savannah Harbor Bird Island

Cons nstruction truction

• Cons

nstruct tructed d in 2004

• Ap

Appro roximate ximately ly 6 acres es abov bove e MLW

• 1.5

5 miles es offshore shore

• Material

aterial removed ed fr from inland and DMCA CA and pumped mped offshor shore

Savannah Harbor Bird Island

Benefits nefits

• In

Increased creased di disposal sposal capa pacity ity by 50 500,000 0,000 cubi bic c yards rds

• Pr

Provides vides protect ected d roosting ting and nesting ting area a for migra gratory y bi bird sp species cies

Savannah Harbor Bird Island

• Cons

nstruct tructed d inshor shore north th of f navi avigation gation cha hann nnel el

Brunswick Harbor Bird Island

Cons nstruction truction

• Cons

nstruct tructed d in 2007 7 du during ing ha harbor bor de deepening pening

• Ap

Appro roximate ximately ly 15 acres es abov bove e MLW

• 0.5

.5 miles es fr from m sh shore re

• Material

aterial dredged dged directly ectly fr from cha hann nnel el bo bottom

• m

to to the he si site te

Brunswick Harbor Bird Island

Benefits nefits

• Pr

Provided vided add dditional itional di disposal sposal capa pacity ity du during ing deepening epening

• Diver

erted d 800 00,000 ,000 cubi bic c yards rds fr from disposal sposal areas eas

• Pr

Provides vides protect ected d roosting ting and nesting ting area a for migrato gratory y bi bird d sp species cies

Brunswick Harbor Bird Island

• Performed
• rmed by Ge

Georgia gia Tech h Scho hool

• l of

f Civi vil l and Envir Environment

• nmental

al En Engineer ineering ng

• Study

dy was s to to ass ssess ss the he vi viabi bility lity of f producing ducing fi fired ed br bricks ks fr from dredge edge material terial fr from the he Sav avann annah ah Ri River er

• Al

Also so looked d at economic nomic feasi sibility bility of f br brick k pr produc

• ductio

tion

Savannah Harbor Brick Study

• Bric

icks ks were su successfully cessfully creat ated ed in the he lab b usi sing ng only y dr dredge dge materials terials (s (silt lt and d sa sand) d) with h minima nimal l additiv itives es

• Economic
• nomic study

dy compared pared bu building ding a br brick k fa factor ctory y on-sit site e to to sh shipping pping the he material terial to to an existing ting br brick k fa factor

• ry

Savannah Harbor Brick Study

• Economics
• nomics determined

ermined be best option ion is s to to sh ship p material erial to to existing ting br brick k fac factories

• ries
• Not

t found d to to curre rrently ntly be be feasibl sible e due to to transpor ansportation ation costs ts to to fa factorie

• ries
• May

y be become me feasibl sible e if f transp spor

• rtation

ation costs ts decrease crease or if f the here re is s an increased reased demand and for green een pr produ ducts cts

Savannah Harbor Brick Study

• Consis

nsistent nt volume ume remo moval al

• Envir

Environment

• nmental

al hu hurdle dles

• Corps

ps bu buy in

Beneficial Use Challenges