BENEFICIAL USE OF DREDGED MATERIAL David M. Griffin, in, P.E. Water erways ys Program gram Manager er May 2, 2012
Overview • 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 harb ha rbor ors 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
Beneficial Uses • 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
Dike Construction • 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 ores 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
Roads/Public Works • 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
Savannah Harbor Bird Island • 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
Brunswick 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 om 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
Savannah Harbor Brick Study • Performed ormed by Ge Georgia gia Tech h Scho hool ol of f Civi vil l and Envir Environment onmental al En Engineer ineering ng • Study dy was s to to ass ssess ss the he vi viabi bility lity of f producing ducing fired fi 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 oductio 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 onomic 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 ory
Savannah Harbor Brick Study • Economics onomics determined ermined be best option ion is s to to sh ship p material erial to to existing ting br brick k fac factories ories • 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 ories • May y be become me feasibl sible e if f transp spor ortation 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
Beneficial Use Challenges • Consis nsistent nt volume ume remo moval al • Envir Environment onmental al hu hurdle dles • Corps ps bu buy in
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