35_20_23_AMENDMENT_0001.pdf

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SLI P 3 SEDI MENT LEVELI NG ( AMENDMENT 1)

PART 1 GENERAL

1. 1 Uni t Pr i ces

1. 1. 1 Wor k Cover ed by Cont r act Pr i ce

The cont r act pr i ce per j ob f or sedi ment l evel i ng shal l i ncl ude t he cost of dr edgi ng, conveyance and pl acement of al l sand, s i l t , c l ay, cobbl es and r ock f r agment s wi t hi n t he l i mi t s as shown on cont r act dr awi ngs CN101 and CN102 and as speci f i ed her ei n, except or i gi nal mat er i al s, l edger ock, boul der s, wr ecks, scr ap mat er i al s, snags, st umps, dr i f t wood, pi l es, debr i s or ot her mat er i al whi ch cannot be r emoved or bur i ed bel ow t he r equi r ed dept h by t he pl ant speci f i ed i n t he accept ed bi d, or t he equi val ent of such pl ant , wi t hout bl ast i ng or speci al appar at us. The uni t pr i ce shal l al so i ncl ude t he cost of al l wor k r equi r ed t o be per f or med f or t he use of t he pl acement ar ea. The Cont r act or shal l use mechani cal means f or dr edgi ng and pl acement of dr edged mat er i al s dur i ng l evel i ng act i v i t i es. Not hi ng i n t hi s Par agr aph shal l be const r ued as pr ohi bi t i ng t he r emoval of except ed mat er i al by speci al means at pr i ces agr eed and appr oved i n accor dance wi t h appl i cabl e pr ovi s i ons of t he cont r act .

1. 2 Def i ni t i on

Har d mat er i al i s def i ned as mat er i al r equi r i ng t he use of speci al equi pment f or economi cal r emoval , and i ncl udes boul der s or f r agment s t oo l ar ge t o be r emoved i n one pi ece by t he dr edge.

1. 3 Ref er ences

U. S. ARMY CORPS OF ENGI NEERS ( USACE)

EM 1110- 2- 1003 Hydr ogr aphi c Sur veyi ng Manual

1. 4 Submi t t al s

Gover nment appr oval i s r equi r ed f or submi t t al s wi t h a " G" desi gnat i on;

submi t t al s not havi ng a " G" desi gnat i on ar e f or i nf or mat i on onl y. When used, a desi gnat i on f ol l owi ng t he " G" desi gnat i on i dent i f i es t he of f i ce t hat wi l l r evi ew t he submi t t al f or t he Gover nment . The f ol l owi ng shal l be submi t t ed i n accor dance wi t h Sect i on 01 33 00 SUBMI TTAL PROCEDURES:

SD- 01 Pr econst r uct i on Submi t t al s

Const r uct i on Schedul e; G- AOF

Thi r t een ( 13) bat hymet r i c sur veys i ncl udi ng ni ne ( 9) i nsi de t he sl i ps and t wo ( 2) at t he East Gat e Basi n dr edge si t e wi l l be col l ect ed by t he Gover nment as par t of t hi s cont r act t o ensur e t hat condi t i ons and const r uct i on ar e commenci ng as pl anned. The Gover nment wi l l r equi r e advance not i ce of const r uct i on st ages t o per f or m t he sur veys.

Fi f t een ( 15) cal endar days pr i or t o st ar t of const r uct i on, t he

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AMENDMENT 1

Cont r act or shal l pr ovi de t he const r uct i on schedul e f or each sl i p i ncl udi ng t he f ol l owi ng i t ems: pl anned i nst al l at i on dat e of t ur bi di t y cur t ai ns; pl anned st ar t of dr edgi ng i n Sl i p 3; pl anned end of dr edgi ng i n Sl i p 3; pl anned st ar t of dr edgi ng i n t he Feder al Navi gat i on Channel ; pl anned st ar t , mi d- poi nt , and compl et i on of Layer A of t he subaqueous cap i n each sl i p; pl anned compl et i on of dr edgi ng i n t he f eder al navi gat i on channel ; pl anned st ar t and compl et i on of Layer B of t he subaqueous cap i n each sl i p.

Soundi ng Equi pment Descr i pt i on and Cal i br at i on Dat a; G- AOF

Soundi ng equi pment shal l be submi t t ed pr i or t o commenci ng wor k.

Submi t t al shal l i ncl ude pr oduct dat a of t he Cont r act or ' s soundi ng equi pment and t r ansducer f r equency. The Cont r act or i s r esponsi bl e t o ver i f y t hat t he soundi ng equi pment has been cal i br at ed t o cor r espond wi t h t he Gover nment ' s Hydr ogr aphi c Sur veyi ng Manual EM 1110-2-1103.

Dr edgi ng, Conveyance, and Pl acement Wor k Pl an; G- AOF

Pr i or t o br i ngi ng equi pment t o t he pr oj ect s i t e, submi t wor k pl an of t he pr oposed dr edgi ng, conveyance and pl acement oper at i ons.

The Cont r act or ' s dr edgi ng, conveyance and pl acement wor k pl an shal l t ake speci al measur es t o mi ni mi ze suspensi on wi t hi n t he wat er col umn and mi xi ng of t he cont ami nat ed mat er i al t hat i s cur r ent l y pr esent wi t hi n t he s l i ps, and mi ni mi ze t he cr eat i on of mud waves. The pl an shal l al so i ncl ude a decont ami nat i on pl an f or t he equi pment i n cont act wi t h exi st i ng sedi ment i n t he s l i p.

Not i ce of St ar t of Const r uct i on St ages; G- AOF

Pr ovi de f or t y- ei ght ( 48) hour s advance wr i t t en not i ce of t he f ol l owi ng const r uct i on st ages: ( 1) pl anned st ar t of t he act ual dr edgi ng i n Sl i p 3; ( 2) pl anned end of dr edgi ng i n Sl i p 3; ( 3) compl et i on of Layer A of t he subaqueous cap i n each sl i p; ( 4) compl et i on of Layer B of t he subaqueous cap i n each sl i p.

SD- 02 Shop Dr awi ngs

Tur bi di t y Cur t ai ns; G- AOF

Cont r act or wi l l submi t f abr i cat i on and assembl y dr awi ngs of pr oposed t ur bi di t y cur t ai n and dr awi ng of pr oposed cur t ai n l ocat i on at mout h of each sl i p.

SD- 03 Pr oduct Dat a

Tur bi di t y Cur t ai ns; G- AOF

Pr oposed t ur bi di t y cur t ai n syst ems t o i ncl ude f abr i c t ype, chai n/ connect or t ypes, bal l ast , f l ot at i on, war ni ng l i ght s, and sect i on/ end connect or s.

Dai l y Repor t of Dr edgi ng Oper at i ons; G- AOF

Repor t of Oper at i ons f or ms ( ENG FORM 4267 or ENG FORM 27A) , as appr opr i at e t o t he t ype of wor k bei ng per f or med, ar e i n RMS CM and shal l be compl et ed and f ur ni shed dai l y. Each r epor t shal l cont ai n i n t he " REMARKS" space at t est i ng t hat no over f l ow or di schar ge

SECTI ON 35 20 23 Page 2 occur r ed f r om t he dr edgi ng vessel ( s) whi l e dr edgi ng and whi l e i n t r ansi t f r om t he dr edgi ng ar ea t o t he unl oadi ng ar ea. I n t he event an over f l ow or di schar ge occur s whi l e dr edgi ng or whi l e i n t r ansi t , an or al not i f i cat i on shal l not be made, and compl et e wr i t t en r epor t on t he i nci dent shal l be made t o t he Cont r act i ng Of f i cer i n shor t est possi bl e t i me. When appr opr i at e and appr oved, qual i t y cont r ol compl i ance i nspect i ons may be r epor t ed under t he " REMARKS" i t em on t he f or m i n RMS.

1. 5 Char act er of Mat er i al s

The Char act er of Mat er i al s f or t hi s sedi ment l evel i ng wor k i s as descr i bed herein.

Mat er i al dr edged f r om wi t hi n t he Sl i p 3 r equi r ed dr edgi ng pr i sm consi st s pr i mar i l y of or gani c s i l t ( OL) . The Sl i p 3 2016 Focused Feasi bi l i t y St udy i dent i f i ed t hat sedi ment s i n t he s l i p ar e cont ami nat ed wi t h PAHs, di oxi ns/ f ur ans, mer cur y, copper , l ead, and zi nc. Cont ami nat ed sedi ment i s gener al l y i dent i f i ed t hr oughout t he s l i ps. Avai l abl e l abor at or y chemi cal anal ysi s r epor t s f or sedi ment sampl es obt ai ned i n Sl i p 3 ar e pr esent ed i n At t achment B.

WOODY DEBRI S OF VARYI NG SHAPES AND SI ZES WAS DI STRI BUTED THROUGHOUT THE

HARBOR DURI NG THE FLOOD EVENT OF 2012. I t i s ant i c i pat ed t hat woody debr i s wi l l be encount er ed i n t he dr edge ar eas. Addi t i onal l y, i t i s i nher ent i n dr edgi ng oper at i ons i n an ol d commer ci al / i ndust r i al har bor as Dul ut h- Super i or Har bor , t o encount er an ar r ay of man- made debr i s e. g.

cabl e, r at chet s, t i r es, wr ecks, scr ap mat er i al s of var i ous composi t i on, pr ocessed r ock, r i pr ap, et c. Cont r act or i s r esponsi bl e f or di sposal and i nci dent al cost s of debr i s r emoved f r om t he East Gat e Basi n sour ce si t e or wi t hi n Sl i p 3 or Sl i p C, dur i ng execut i on of t hi s cont r act .

The r ecor ds of pr evi ous dr edgi ng and sampl i ng ar e avai l abl e f or i nspect i on at t he Of f i ce of t he Engi neer i ng, Desi gn & Const r uct i on Of f i ce, U. S. Ar my Cor ps of Engi neer s, Det r oi t Di st r i ct , 477 Mi chi gan Avenue, McNamar a Bui l di ng, Det r oi t , Mi chi gan.

1. 6 Pl acement Ar eas

Pl ace mat er i al s dr edged f r om wi t hi n Sl i p 3 i nsi de t he i n- wat er pl acement ar ea ( i . e. subaqueous cap ar ea) as i ndi cat ed on cont r act dr awi ngs CN101 and CN102. The pl acement di schar ge shal l be cont ai ned wi t hi n t he boundar i es of t he pl acement ar ea as i ndi cat ed on t he dr awi ngs. The mat er i al shal l be pl aced t o t he el evat i ons and t ol er ances shown on t he dr awi ngs. No mat er i al shal l be pl aced out si de t he subaqueous cap boundaries.

The Cont r act or shal l mi ni mi ze t he di spl acement of exi st i ng sedi ment s dur i ng pl acement oper at i ons. I f exi st i ng sedi ment s ar e pushed above t he t ar get el evat i on as t he r esul t of mudwave, t hey may r emai n i n pl ace unt i l compl et i on of pl acement oper at i ons i n t he pl acement ar ea. Di spl aced mat er i al s shal l t hen be wor ked back i nt o t he pl acement ar ea l i mi t s t o t he el evat i ons i ndi cat ed on t he dr awi ngs.

1. 7 Sequenci ng and Schedul i ng

The Cont r act or shal l not i f y t he Cont r act i ng Of f i cer ' s Repr esent at i ve a mi ni mum of f our ( 4) cal endar days pr i or t o t he need f or each Gover nment bat hymet r i c sur vey. The Cont r act or shal l assume a 72- hour col l ect i on and

SECTI ON 35 20 23 Page 3 pr ocessi ng t i me f or each sur vey by t he Gover nment .

1. 7. 1 Del i ver y of Pl ant and Or der of Wor k

Pr i or t o br i ngi ng equi pment t o t he pr oj ect s i t e, t he cont r act or shal l submi t a Dr edgi ng, Conveyance and Pl acement Wor k Pl an descr i bi ng i n det ai l how he pl ans on accompl i shi ng t he pr oposed wor k. Unl ess ot her wi se di r ect ed by t he Cont r act i ng Of f i cer , t he Cont r act or shal l accompl i sh t he r equi r ed wor k wi t hi n t he t i me est abl i shed i n t he Cont r act document s.

1. 8 Ar t i f i c i al Obst r uct i ons

Debr i s i s ant i c i pat ed i n pl acement ar eas i n Sl i p 3 and Sl i p C. The Gover nment has no knowl edge of cabl es, pi pes, or ot her ar t i f i c i al obst r uct i ons or of any wr ecks, wr eckage, or ot her mat er i al t hat woul d necessi t at e t he empl oyment of addi t i onal equi pment f or economi cal r emoval .

Any exi st i ng channel cr ossi ng t hat i s damaged due t o t he Cont r act or ' s oper at i ons shal l be r epai r ed by t he Cont r act or and at i t s expense. I f act ual condi t i ons di f f er f r om t hose st at ed or shown, or bot h, an adj ust ment i n cont r act pr i ce or t i me f or compl et i on, or bot h, wi l l be made i n accor dance wi t h FAR 52. 236- 2, Di f f er i ng Si t e Condi t i ons.

1. 9 Soundi ngs

The cont r act dr awi ngs r epr esent t he condi t i ons exi st i ng at t he t i me of sur vey. Det er mi nat i on of quant i t i es r emoved wi l l be made f r om af t er dr edgi ng soundi ngs t aken by t he Gover nment and t he cal cul at i ons made t her e f r om t o det er mi ne quant i t i es by i n- pl ace measur ement . The Gover nment det er mi nat i on of t he quant i t i es t o be pai d f or i n t he ar ea speci f i ed, af t er havi ng once been made, wi l l not be r eopened, except on evi dence of col l usi on, f r aud, or obvi ous er r or .

1. 10 Vol ume Cal cul at i ons

Vol ume cal cul at i ons wi l l be based on pr e and post bat hymet r i c sur veys by t he Gover nment t o achi eve f i nal el evat i ons of s l i p l evel i ng.

I n pr oj ect ar eas sur veyed usi ng si ngl e- beam sonar , t he vol ume of mat er i al r emoved shal l be cal cul at ed usi ng t he aver age end ar ea met hod. The HYPACK sof t war e Phi l adel phi a Pr e Dr edge and Post Dr edge vol ume cal cul at i on met hod shal l be used f or al l s i ngl e- beam vol ume comput at i ons.

I n pr oj ect ar eas sur veyed usi ng mul t i - beam sonar , t he vol ume of mat er i al r emoved wi l l be comput ed usi ng a TI N ( Tr i angul at ed I r r egul ar Net wor k) model as out l i ned i n t he Hydr ogr aphi c Sur veyi ng Manual EM- 1110- 2- 1003, dat ed November 30, 2013. The HYPACK sof t war e TI N model Phi l adel phi a vol ume cal cul at i on met hod wi l l be used f or al l mul t i - beam vol ume comput at i ons. A 1- f oot , by 1 f oot mat r i x usi ng t he aver age dept h soundi ng wi l l be gener at ed f r om t he edi t ed mul t i - beam dat a t o per f or m t he TI N vol ume comput at i ons. The cor r espondi ng pl ot t ed soundi ng sheet s wi l l be gener at ed usi ng a pl ot - scal e dependent mat r i x cel l ut i l i z i ng t he mi ni mum dept h f r om t he 1x1 Aver age dat aset used t o cal cul at e vol umes. I nRoads sof t war e by Bent l ey wi l l be used t o cal cul at e t he cut and f i l l vol umes.

Al l pl ot s of soundi ngs pr ovi ded t o t he Cont r act or dur i ng admi ni st r at i on of t hi s cont r act shal l be a gr aphi cal r epr esent at i on onl y and shal l NOT be used f or vol ume cal cul at i ons. Al l sur vey dat a used f or vol ume comput at i ons shal l be avai l abl e t o t he Cont r act or upon r equest .

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1. 11 Over dept h Dr edgi ng

When dr edgi ng wi t hi n Sl i p 3 f or t he l evel i ng ef f or t , t he Cont r act or shal l ensur e t hat over dept h dr edgi ng does not cr eat e a sur pl us of cut mat er i al ver sus t he avai l abl e pl acement ar ea i n t he shal l ow cap ar ea. I n t he event t hat t hi s occur s, t he Cont r act or shal l be r esponsi bl e f or dr edgi ng and f i l l i ng sedi ment wi t hi n t he shal l ow cap ar ea of Sl i p 3 unt i l t he bat hymet r i c sur vey i s accept ed by t he COR.

1. 12 Per mi t

The Cont r act or shal l compl y wi t h condi t i ons and r equi r ement s of t he Cor ps of Engi neer s Per mi t and ot her St at e or Feder al per mi t s. The Cont r act i ng Of f i cer wi l l secur e t he per mi t f or dr edgi ng and pl acement of mat er i al as indicated.

1. 13 Envi r onment al Pr ot ect i on Requi r ement

Pr ovi de and mai nt ai n dur i ng t he l i f e of t he cont r act , envi r onment al pr ot ect i ve measur es. Al so, pr ovi de envi r onment al pr ot ect i ve measur es r equi r ed t o cor r ect condi t i ons, such as oi l spi l l s or debr i s, t hat occur dur i ng t he dr edgi ng oper at i ons. Compl y wi t h Feder al , St at e, and l ocal r egul at i ons per t ai ni ng t o wat er , ai r , and noi se pol l ut i on.

1. 13. 1 Tur bi di t y Cur t ai n Requi r ement

I n or der t o mai nt ai n an accept abl e c l ar i t y of wat er wi t hi n t he pl acement ar ea and adj acent wat er s, t he use of a t ur bi di t y cur t ai n i s r equi r ed i n Sl i p 3 and Sl i p C. The t ur bi di t y cur t ai ns shal l conf or m t o at l east a U. S.

DOT Type I I , shal l f ul l y encl ose t he ent i r e s l i p f r om wal l t o wal l , shal l ext end t he f ul l wat er col umn, and shal l be wei ght ed not anchor ed. The Cont r act or shal l oper at e and mai nt ai n t he t ur bi di t y cur t ai ns i n accor dance wi t h t he manuf act ur er ' s speci f i cat i ons.

1. 13. 2 Tur bi di t y Cur t ai n Moni t or i ng

Nonconf or mance wi t h manuf act ur er s speci f i cat i ons shal l be r epor t ed t o t he COR i mmedi at el y and shal l be cor r ect ed wi t hi n t went y- f our ( 24) hour s. The goal f or i mpl ement at i on of t he t ur bi di t y cur t ai ns i s t o mi ni mi ze t he ar ea of t ur bi di t y gener at ed by pl acement oper at i ons and pr event t ur bi di t y of t he wat er s out si de t he pl acement ar ea. The Gover nment wi l l v i sual l y moni t or pl acement ar ea wat er qual i t y i nsi de and out si de of t he cur t ai n f or t ur bi di t y. At any t i me t ur bi di t y becomes subst ant i al l y v i sual l y appar ent on t he out si de of t he pl acement ar eas as a r esul t of t he Cont r act or ' s oper at i ons i n ar eas ot her t han t he i mmedi at e v i c i ni t y of wher e vessel s ar e ent er i ng, t he Cont r act or shal l i mmedi at el y modi f y hi s oper at i ons and t ake cor r ect i ve measur es t o pr event a r eoccur r ence. Moni t or i ng wi l l cont i nue f or a per i od of f i f t een ( 15) cal endar days af t er compl et i on of pl acement oper at i ons i n t he associ at ed sl i p. The Cont r act or shal l mai nt ai n t he t ur bi di t y cur t ai ns dur i ng t hi s 15 day per i od. I f t he v i sual appear ance of t he wat er i nsi de t he cur t ai n mat ches t hat out si de t he cur t ai n, t he COR may al l ow t he cur t ai n t o be r emoved pr i or t o t he end of t he 15 day per i od.

1. 13. 3 Tur bi di t y Cur t ai n I nst al l at i on and Removal

The t ur bi di t y cur t ai ns shal l be i nst al l ed pr i or t o t he dr edgi ng and pl acement oper at i on i n each sl i p. Tur bi di t y Cur t ai ns shal l r emai n i npl ace f or t he r emai nder of pl acement oper at i ons and af t er - pl acement moni t or i ng per i od, as speci f i ed i n t he pr evi ous par agr aph. Dur i ng t he cour se of t he

SECTI ON 35 20 23 Page 5 cont r act , t he Gover nment r eser ves t he r i ght t o r equi r e t he Cont r act or t o i nst al l t he t ur bi di t y cur t ai n at anyt i me i f t he t ur bi di t y l evel s become excessive.

PART 2 PRODUCTS

2. 1 Tur bi di t y Cur t ai n

The t ur bi di t y cur t ai n shal l conf or m t o at l east U. S. DOT Type I I r equi r ement s. Pr oposed t ur bi di t y cur t ai n syst ems t o i ncl ude f abr i c t ype, chai n connect or t ypes, bal l ast , f l oat at i on, war ni ng l i ght s, and sect i on/ end connect or s.

PART 3 EXECUTI ON

3. 1 Tur bi di t y Cur t ai n I nst al l at i on and Use

I nst al l t ur bi di t y cur t ai n i n conf or mance wi t h manuf act ur er ' s speci f i cat i ons pr i or t o st ar t of dr edgi ng act i v i t i es i n t he s l i p, at t he l ocat i on i ndi cat ed i n shop dr awi ngs by Cont r act or . The cont act or shal l oper at e and mai nt ai n t he t ur bi di t y cur t ai n i n accor dance wi t h t he manuf act ur er ' s speci f i cat i ons, and as descr i bed i n SECTI ON 35 20 23, ' ENVI RONMENTAL PROTECTI ON REQUI REMENT' . The t ur bi di t y cur t ai n may be opened and cl osed t o al l ow const r uct i on vessel s i nt o and out of t he s l i p.

3. 2 Sedi ment Level i ng

Level i ng wi l l be per f or med wi t hi n Sl i p 3 as shown on t he dr awi ngs. Al l mat er i al wi t hi n t he desi gnat ed pr oj ect ar ea t hat i s above - 10. 5 LWD shal l be dr edged and pl aced wi t hi n t he pr oj ect ar ea i n t he open wat er pl acement ar eas bel ow - 10. 5 LWD. The Cont r act or may be r equi r ed t o suspend dr edgi ng at any t i me when f or any r eason t he gauges or r anges cannot be seen or pr oper l y f ol l owed.

3. 3 Obst r uct i ons

Shoul d or i gi nal mat er i al , l edge r ock, boul der s, cobbl es, r ock f r agment s, wr ecks, scr ap mat er i al s, snags, st umps, pi l es, debr i s or ot her mat er i al be encount er ed whi ch cannot be r emoved by t he pl ant speci f i ed i n t he accept ed bi d, or equi val ent pl ant , wi t hout bl ast i ng or speci al appar at us, t he Cont r act or shal l r emove al l over l y i ng mat er i al wi t hi n t he r equi r ed dr edgi ng pr i sm whi ch i n t he j udgment of t he Cont r act i ng Of f i cer can be r emoved by t he use of t he pl ant speci f i ed i n t he accept ed bi d or equi val ent pl ant . The Cont r act or shal l i mmedi at el y not i f y t he COR i f an obst r uct i on i s encount er ed wi t hi n Sl i p 3, Sl i p C or t he East Gat e Basi n Bor r ow Ar ea. I f debr i s obj ect s l ocat ed wi t hi n t he subaqueous cap ar ea ext end mor e t han 2- f t above f i nal l evel i ng gr ade, Cont r act or shal l coor di nat e wi t h t he COR f or di r ect i on.

3. 4 Equi pment Decont ami nat i on

Al l equi pment used f or l evel i ng t he exi st i ng sedi ment s i n t he s l i p t hat di r ect l y cont act s t hose sedi ment s shal l be decont ami nat ed at t he compl et i on of l evel i ng and pr i or t o use at any l ocat i ons out si de of t he s l i p. Decont ami nat i on pr ocedur es shal l be i ncl uded by t he Cont r act or i n t he Dr edgi ng, Conveyance, and Pl acement Pl an as di scussed i n SECTI ON 35 20 23 par agr aph t i t l ed ' SUBMI TTALS' . I t i s accept abl e t o decont ami nat e t he dr edge bucket s and equi pment used i n t he s l i p l evel i ng pr ocess, and al l ow t he decont ami nat i on r i nse wat er t o be di schar ged i nt o t he s l i p wi t hi n t he

SECTI ON 35 20 23 Page 6 sedi ment l evel i ng wor k ar ea whi l e t he s l i p r emai ns i sol at ed f r om t he har bor wi t h t he t ur bi di t y cur t ai n.

3. 5 Channel Cr ossi ng

The Cont r act or shal l not dr edge bel ow a gr ade t hr ee ( 3) f eet above pi pes, cabl es, t unnel s, and ot her submer ged cr ossi ngs shown on t he cont r act dr awi ngs or i ndi cat ed i n t hese speci f i cat i ons. Thi s r est r i ct i on appl i es f or a di st ance of t went y- f i ve ( 25) f eet upst r eam and t went y- f i ve ( 25) f eet downst r eam of each channel cr ossi ng. Any exi st i ng cr ossi ng t hat i s damaged due t o Cont r act or oper at i ons shal l be r epai r ed by t he Cont r act or at hi s expense.

3. 6 I nspect i on

I nspect t he wor k, keep r ecor ds of wor k per f or med, and ensur e t hat gages, t ar get s, r anges, and ot her mar ker s ar e i n pl ace and usabl e f or t he i nt ended pur pose. Fur ni sh, at t he r equest of t he Cont r act i ng Of f i cer , boat s, boat men, l abor er s, and mat er i al s necessar y f or i nspect i ng, super vi s i ng, and sur veyi ng t he wor k. When r equi r ed, pr ovi de t r anspor t at i on f or t he Cont r act i ng Of f i cer and i nspect or s t o and f r om t he pl acement ar ea and bet ween t he dr edgi ng pl ant and adj acent poi nt s on shor e.

3. 7 Conduct of Wor k

3. 7. 1 Bar ge Anchor i ng Rest r i ct i ons

Cont r act or i s pr ohi bi t ed f r om use of t empor ar y anchor s or spuds wi t hi n t he cappi ng and dr edgi ng ar eas i n Sl i p 3 and Sl i p C.

3. 7. 2 Or der of Wor k

Level t he sedi ment sur f ace i n Sl i p 3 by dr edgi ng t o el evat i ons shown i n t he dr awi ngs pr i or t o pl acement of any subaqueaous cap backf i l l mat er i al s.

Upon appr oval of sedi ment l evel i ng by COR, t he Cont r act or shal l compl et e t he pi l ot t est as speci f i ed i n SECTI ON 35 20 24.

3. 7. 3 Li ght s

Each ni ght , bet ween sunset and sunr i se and dur i ng per i ods of r est r i ct ed vi s i bi l i t y , pr ovi de l i ght s f or f l oat i ng pl ant s, pi pel i nes, r anges, mar ker s, and t ur bi di t y cur t ai n. Al so, pr ovi de l i ght s f or buoys t hat coul d endanger or obst r uct navi gat i on. When ni ght wor k i s i n pr ogr ess, mai nt ai n l i ght s f r om sunset t o sunr i se f or t he obser vat i on of dr edgi ng oper at i ons.

Li ght i ng shal l conf or m t o Uni t ed St at es Coast Guar d r equi r ement s f or v i s i bi l i t y and col or .

3. 7. 4 Ranges, Gages, and Li nes

Fur ni sh, set , and mai nt ai n r anges, buoys, and mar ker s needed t o def i ne t he wor k and t o f aci l i t at e i nspect i on. Est abl i sh and mai nt ai n gages i n l ocat i ons obser vabl e f r om each par t of t he wor k so t hat t he dept h may be det er mi ned. Suspend dr edgi ng when t he gages or r anges cannot be seen or f ol l owed. The Cont r act i ng Of f i cer wi l l f ur ni sh, upon r equest by t he Cont r act or , sur vey l i nes, poi nt s, and el evat i ons necessar y f or t he set t i ng of r anges, gages, and buoys.

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3. 7. 5 Pl ant

Mai nt ai n t he pl ant , scows, bar ges, and associ at ed equi pment t o meet t he r equi r ement s of t he wor k.

3. 7. 6 Condi t i on of Scows

Al l scows used f or t r anspor t i ng t he dr edged mat er i al shal l be kept i n good condi t i on. Decks of vessel s shal l be c l eaned of dr edged mat er i al bef or e l eavi ng t he dr edgi ng ar ea.

3. 7. 7 Unl oadi ng of Scows

When scow unl oadi ng i s per f or med wi t h t he use of a c l amshel l or bucket , t he pl acement ar ea encl osur e shal l be r et ur ned t o i t s or i gi nal condi t i on by r emovi ng al l mat er i al deposi t ed t her eon t o t he sat i sf act i on of t he Cont r act i ng Of f i cer .

3. 7. 8 Navi gat i on War ni ngs

Fur ni sh and mai nt ai n navi gat i on war ni ng si gns al ong t he t ur bi di t y cur t ai n and any ot her st r uct ur es/ equi pment i mmedi at el y out si de t he cur t ai n.

3. 7. 9 Met hod of Communi cat i on

Pr ovi de a syst em of communi cat i on bet ween t he dr edge cr ew and t he cr ew at t he pl acement ar ea. A por t abl e t wo- way r adi o i s accept abl e.

3. 7. 10 Sal vaged Mat er i al

Anchor s, chai ns, f i r ear ms, and ot her ar t i c l es of val ue, whi ch ar e br ought t o t he sur f ace dur i ng dr edgi ng oper at i ons, shal l r emai n or become t he pr oper t y of t he Gover nment and shal l be deposi t ed on shor e at a conveni ent l ocat i on near t he s i t e of t he wor k, as di r ect ed.

3. 7. 11 Saf et y of St r uct ur es and Ut i l i t i es

The pr osecut i on of wor k shal l ensur e t he st abi l i t y of pi er s, bul kheads, ot her st r uct ur es and ut i l i t y l i nes, l y i ng on or adj acent t o t he s i t e of t he wor k, i nsof ar as st r uct ur es may be j eopar di zed by dr edgi ng oper at i ons. Repai r damage r esul t i ng f r om dr edgi ng oper at i ons, i nsof ar as such damage may be caused by var i at i on i n l ocat i ons or dept h of dr edgi ng, or bot h, f r om t hat i ndi cat ed or per mi t t ed under t he cont r act .

3. 7. 12 Pl ant Removal

Upon compl et i on of t he wor k, pr ompt l y r emove pl ant , i ncl udi ng r anges, buoys, pi l es, and ot her mar ker s or obst r uct i ons.

3. 7. 13 Equi pment

Al l naut i cal vessel s and l and based t r anspor t and conveyance syst ems shal l be oper at ed, l oaded and unl oaded i n such manner as t o pr event over f l ow, spi l l s , l eaks, wast e, or ot her l oss of dr edged mat er i al s bet ween poi nt of pi ck- up and poi nt of deposi t i on wi t hi n t he subaqueous cap ar ea. Haul i ng vessel s shal l have suf f i c i ent s i dewal l hei ght and i nt egr i t y t o pr event dr ai nage over or t hr ough t he si des and bot t om dur i ng haul i ng.

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3. 7. 14 Met hod of Pl acement

The met hod empl oyed by t he Cont r act or i n conveyi ng dr edged mat er i al s t o t he pl acement ar ea shal l be as appr oved by t he Cont r act i ng Of f i cer at al l t i mes. Tempor ar y dumpi ng or pl acement of mat er i al s out si de of t he pl acement ar ea f or subsequent r ehandl i ng i nt o t he pl acement ar ea i s pr ohi bi t ed unl ess ot her wi se appr oved by t he Cont r act i ng Of f i cer .

The Cont r act or shal l use mechani cal means f or pl acement of dr edged mat er i al s dur i ng l evel i ng. I n or der t o cont r ol pl acement of dr edge mat er i al s and pr event mud wave, t he Cont r act or shal l pl ace dr edged mat er i al s usi ng submer ged di schar ge met hods. Mat er i al s shal l be di schar ge a maxi mum of 3- f eet above t he wor ki ng sedi ment sur f ace unl ess ot her wi se appr oved by t he Cont r act i ng Of f i cer .

3. 7. 15 Pl acement i n I ndi cat ed Pl acement Ar eas

The dr edge mat er i al s shal l be pl aced wi t hi n t he i n- wat er pl acement ar ea shown on t he cont r act dr awi ngs. Pl acement of t he mat er i al s wi t hi n t he pl acement ar ea shal l be as speci f i ed and shown except as ot her wi se di r ect ed by t he Cont r act i ng Of f i cer . Except as ot her wi se aut hor i zed by t he Cont r act i ng Of f i cer i n wr i t i ng, no pl acement shal l be per f or med unl ess a r epr esent at i ve of t he Cont r act or f or Qual i t y Cont r ol i s pr esent at t he t i me. The met hod empl oyed by t he Cont r act or i n deposi t i ng dr edged mat er i al s i n t he pl acement ar ea shal l be as appr oved by t he Cont r act i ng Of f i cer at al l t i mes.

3. 7. 16 Mi spl aced Mat er i al

Any mat er i al t hat i s pl aced el sewher e t han i n t he pl aces desi gnat ed i n t he Cont r act or appr oved by t he Cont r act i ng Of f i cer wi l l not be pai d f or . The Cont r act or shal l be r equi r ed t o r emove such mi spl aced mat er i al at i t s expense and deposi t i t i n t he pl ace desi gnat ed i n t hi s cont r act or appr oved by t he Cont r act i ng Of f i cer .

3. 8 Cont r act or Qual i t y Cont r ol

The Cont r act or shal l est abl i sh and mai nt ai n a qual i t y cont r ol syst em f or dr edgi ng and pl acement oper at i ons t o assur e compl i ance wi t h t he Cont r act r equi r ement s and pr ovi de a Dai l y Repor t of Dr edgi ng Oper at i ons by compl et i ng t he appr opr i at e f or m and compl et i ng al l i nspect i ons of i t ems under t hi s syst em, i ncl udi ng, but not l i mi t ed t o, t he f ol l owi ng:

a. Layout of wor k, and pl acement ar eas.

b. Pr oper dr edgi ng dept hs and pl acement hei ght s.

c. Conveyance and pl acement oper at i ons.

d. Removal of mi spl aced mat er i al .

e. Saf et y r equi r ement s.

3. 9 Gover nment I nspect i on

3. 9. 1 Gauge Mai nt enance

The Cont r act or shal l mai nt ai n i t s gauges, r anges, l ocat i on mar ks and l i mi t mar ks i n pr oper or der and posi t i on. The pr esence of a Gover nment i nspect or

SECTI ON 35 20 23 Page 9 shal l not r el i eve t he Cont r act or of i t s r esponsi bi l i t y f or t he pr oper execut i on of t he wor k i n accor dance wi t h t he speci f i cat i ons and dr awi ngs.

3. 9. 2 Faci l i t i es

The Cont r act or shal l f ur ni sh, on t he r equest of t he Cont r act i ng Of f i cer or any i nspect or , t he use of such boat s, boat oper at or s, l abor er s and mat er i al f or mi ng a par t of t he or di nar y and usual equi pment and cr ew of t he dr edgi ng pl ant as may be r easonabl y necessar y i n i nspect i ng t he wor k.

3. 9. 3 Tr anspor t at i on

The Cont r act or shal l f ur ni sh, on t he r equest of t he Cont r act i ng Of f i cer or any i nspect or , sui t abl e t r anspor t at i on f r om desi gnat ed poi nt s on shor e t o and f r om t he var i ous pi eces of of f - shor e pl ant and of f - shor e pl acement areas.

3. 9. 4 Compl i ance

Shoul d t he Cont r act or r ef use, negl ect , or del ay compl i ance wi t h t hese r equi r ement s, t he speci f i c f aci l i t i es may be f ur ni shed and mai nt ai ned by t he Cont r act i ng Of f i cer , and t he cost t her eof wi l l be deduct ed f r om any amount s due or t o become due t he Cont r act or .

3. 10 Measur ement

Pr i or , af t er , and check sur veys shal l be made at t he t i mi ng i ndi cat ed i n t he cont r act dr awi ngs and wi l l be accompl i shed by t he met hods descr i bed, her ei n. The Gover nment shal l compl et e pr i or , af t er and check sur veys.

Addi t i onal soundi ngs wi l l be t aken as t he Cont r act i ng Of f i cer may deem necessar y. I f addi t i onal pr i or sur veys ar e r equi r ed, due t o t he Cont r act or ' s oper at i ons, t he cost of such sur veys shal l be pai d by t he Cont r act or . The cost of such sur veys shal l be t he same as speci f i ed i n t he Par agr aph ent i t l ed, " Fi nal Exami nat i on and Accept ance. "

3. 10. 1 Met hod of Measur ement

Hydr ogr aphi c Sur veys wi l l be conduct ed t o meet USACE Per f or mance St andar ds as def i ned i n t he Hydr ogr aphi c Sur veyi ng Manual EM 1110- 2- 1003 dat ed 30 November 2013. Sur veys wi l l be per f or med by mul t i - beam sweep t ype sur veys and/ or by s i ngl e beam soundi ng equi pment . The mul t i - beam sonar and t he si ngl e beam sonar wi l l be cal i br at ed f ol l owi ng pr ocedur es out l i ned i n t he af or ement i oned EM. The same equi pment shal l be used f or pr i or s and af t er sur veys, usi ng t he same wor k pl at f or m

3. 11 Fi nal Exami nat i on and Accept ance

3. 11. 1 Exami nat i on

Upon Cont r act or ' s not i f i cat i on of compl et i on of t he l evel i ng of sedi ment s of t he s l i p by dr edgi ng, such wor k wi l l be t hor oughl y exami ned by t he Gover nment usi ng t he Gover nment pr ovi ded sur vey dat a. Shoul d any shoal s, l umps or ot her l ack of cont r act dept h be di scl osed by t hi s exami nat i on, t he Cont r act or i s r equi r ed t o r emove same by dr edgi ng at no cost t o t he Gover nment . When t he ar ea i s f ound t o be wi t hi n t he t ol er ances descr i bed i n t he cont r act dr awi ngs, i t wi l l be accept ed f i nal l y. Shoul d mor e t han t wo ( 2) bat hymet r i c sur vey oper at i ons by t he Gover nment over an ar ea be necessar y by r eason of wor k f or t he per f or mance of cont r act at a pr i or bat hymet r i c sur vey, t he cost of such t hi r d and any subsequent bat hymet r i c

SECTI ON 35 20 23 Page 10 sur vey oper at i ons wi l l be char ged agai nst t he Cont r act or at t he r at e of $3, 500 per cal endar day i n whi ch t he Gover nment pl ant i s engaged i n bat hymet r i c sur vey and/ or i s enr out e t o or f r om t he si t e or hel d at or near t he sai d s i t e f or such oper at i ons. Al l addi t i onal sur veys and st and by t i me f or addi t i onal sur veys r equi r ed t o conf i r m t he adequacy of t he Cont r act or ' s wor k shal l be consi der ed i nci dent al t o t he cont r act .

3. 11. 2 Accept ance

Fi nal accept ance of t he whol e or par t of t he wor k and t he deduct i ons or cor r ect i ons of deduct i ons made t her eon wi l l not be r eopened af t er havi ng once been made, except on evi dence of col l usi on, f r aud, or obvi ous er r or , and t he accept ance of a compl et ed sect i on shal l not change t he t i me of payment of t he r et ai ned per cent ages of t he whol e or any par t of t he work.

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