Technical_Specifications,_(Revised_Section)_35_20_23.pdf

Char l er oi Locks and Dam St i l l i ng Basi n & Abut ment Pr ot ect i on Wal l

SECTI ON TABLE OF CONTENTS

DI VI SI ON 35 - WATERWAY AND MARI NE CONSTRUCTI ON

SECTI ON 35 20 23

DREDGING

PART 1 GENERAL

1. 1 WORK COVERED BY THI S SECTI ON

1. 1. 1 Excavat i on f or St i l l i ng Basi n and Abut ment Pr ot ect i on Wal l

1. 1. 2 Removal of Exi st i ng Tr ai ni ng Di ke

1. 1. 3 Removal of Exi st i ng Der r i ck St one

1. 1. 4 Fl oodway and Appr oach Dr edgi ng

1. 1. 5 Excavat i on of Ar ea C

1. 2 REFERENCES

1. 3 ORDER OF WORK AND DREDGI NG RESTRI CTI ONS

1. 3. 1 Excavat i on f or St i l l i ng Basi n and Abut ment Pr ot ect i on Wal l

1. 3. 2 Fl oodway and Appr oach Dr edgi ng

1. 4 SUBMI TTALS

1. 5 TYPE OF MATERI AL TO BE REMOVED

1. 6 SI TE CONDI TI ONS

1. 7 DREDGI NG PERSONNEL QUALI FI CATI ONS

1. 8 DI FFERENTI AL GLOBAL POSI TI ONI NG SYSTEM ( DGPS) EQUI PMENT

1. 9 CLAMSHELL BUCKET POSI TI ONI NG

1. 10 GOVERNMENT PLANT

1. 11 QUANTI TY OF MATERI AL

1. 11. 1 Excavat i on f or St i l l i ng Basi n and Abut ment Pr ot ect i on Wal l

1. 11. 2 Fl oodway and Appr oach Dr edgi ng

1. 12 FUEL OI L HANDLI NG

1. 13 QUALI TY ASSURANCE

1. 14 FI NAL EXAMI NATI ON AND ACCEPTANCE

1. 14. 1 Excavat i on f or St i l l i ng Basi n and Abut ment Pr ot ect i on Wal l

1. 14. 2 Fl oodway and Appr oach Dr edgi ng

1. 14. 3 Fi nal Accept ance

1. 15 CONTI NUI TY OF WORK

1. 16 SHOALI NG

PART 2 PRODUCTS

PART 3 EXECUTI ON

3. 1 I NSPECTI ON

3. 2 DI SPOSAL OF EXCAVATED MATERI AL

3. 2. 1 Gener al

3. 2. 2 Mi spl aced Mat er i al

3. 2. 3 Di sposal of Excavat ed Dr edgi ng Mat er i al

3. 2. 3. 1 Hopper Dr edgi ng

3. 2. 3. 2 Hydr aul i c Dr edgi ng

3. 2. 3. 3 Mechani cal Dr edgi ng

3. 2. 3. 4 Gover nment Qual i t y Cont r ol Moni t or

3. 2. 4 Pl ant Removal

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3. 2. 5 Di sposal of Der r i ck St one and Tr ai ni ng Di ke Rock

3. 3 ACCESS TO THE OFF- LOADI NG FACI LI TY

3. 4 DREDGI NG FOR STI LLI NG BASI N AND ABUTMENT PROTECTI ON WALL

3. 4. 1 Li mi t s of Wor k

3. 4. 2 Removal of Obst r uct i ons

3. 4. 3 Sal vaged Mat er i al

3. 4. 4 Saf et y of St r uct ur es

3. 5 FLOODWAY AND APPROACH DREDGI NG

3. 5. 1 Over dept h Dr edgi ng And Si de Sl opes

3. 5. 1. 1 Gener al

3. 5. 1. 2 Over dept h Dr edgi ng

3. 5. 1. 3 Si de and End Sl opes

3. 5. 1. 3. 1 Excessi ve Dr edgi ng

3. 5. 2 Conduct Of Dr edgi ng Wor k

3. 5. 2. 1 I nt er f er ence wi t h Navi gat i on

3. 5. 2. 2 Ranges, Gages, and Li nes

3. 5. 2. 3 Pl ant

3. 5. 2. 4 Saf et y of St r uct ur es

3. 5. 2. 5 Pl ant Removal

3. 6 RECORDS

- - End of Sect i on Tabl e of Cont ent s - -

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SECTI ON 35 20 23

DREDGING

PART 1 GENERAL

1. 1 WORK COVERED BY THI S SECTI ON

1. 1. 1 Excavat i on f or St i l l i ng Basi n and Abut ment Pr ot ect i on Wal l

The wor k cover ed by t hi s sect i on, and i ncl uded i n t he payment i t em DREDGI NG FOR SCOUR PROTECTI ON AND ABUTMENT PROTECTI ON WALL, i ncl udes r emovi ng der r i ck st ones ( 150 - 12, 000 pounds each) and dr edgi ng and l oadi ng of exi st i ng r i ver bed mat er i al t o t he l i nes, gr ades, and el evat i ons shown on t he dr awi ngs t o f or m t he 3H: 1V sl ope r equi r ed f or gr out bag i nst al l at i on and pr e- excavat i on f or const r uct i on of t he abut ment pr ot ect i on wal l . The r emoved der r i ck st ones may be used f or scour pr ot ect i on as shown on t he dr awi ngs.

1. 1. 2 Removal of Exi st i ng Tr ai ni ng Di ke

The wor k cover ed by t hi s sect i on, and i ncl uded i n t he payment i t em REMOVAL AND PLACEMENT OF EXI STI NG TRAI NI NG DI KE STONE, i ncl udes r emoval of t he exi st i ng t r ai ni ng di ke downst r eam of Gat e Bay No. 2 and pl acement of t he r emoved R- 7 and R- 8 der r i ck st one as speci f i ed and as shown on t he dr awi ngs.

1. 1. 3 Removal of Exi st i ng Der r i ck St one

The wor k cover ed by t hi s sect i on, and i ncl uded i n t he payment i t em REMOVAL AND PLACEMENT OF DERRI CK STONE, i ncl udes r emoval of t he exi st i ng der r i ck st one downst r eam of t he dam and adj acent t o t he exi st i ng abut ment wal l and pl acement of t he r emoved der r i ck st one as speci f i ed and as shown on t he dr awi ngs.

1. 1. 4 Fl oodway and Appr oach Dr edgi ng

The wor k cover ed by t hi s sect i on, and i ncl uded i n t he payment i t em DREDGI NG, i ncl udes dr edgi ng bet ween t he downst r eam l i mi t s of excavat i on f or t he st i l l i ng basi n and abut ment pr ot ect i on wal l and t he downst r eam l i mi t s shown on t he dr awi ngs, dr edgi ng upst r eam of t he dam, and dr edgi ng l ock appr oaches and t r anspor t i ng t he mat er i al t o t he Vi ct or y Hol l ow Si t e f or of f l oadi ng and pl acement by ot her s. The payment i t em does not i ncl ude r emoval of l edge r ock, gener al debr i s, r ock f r agment s, wr ecks, snags, st umps, and pi l es whi ch cannot be r emoved or bur i ed bel ow pr oj ect dept h wi t hout bl ast i ng. Shoul d l edge r ock or ot her mat er i al whi ch cannot be r emoved wi t hout bl ast i ng be encount er ed, r emove t her ef r om al l over l y i ng mat er i al whi ch i n t he j udgment of t he Cont r act i ng Of f i cer can be r emoved.

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 upon and appr oved i n accor dance wi t h Sect i on 00 70 00 CONDI TI ONS OF THE CONTRACT, FAR 52. 236- 2

DI FFERI NG SI TE CONDI TI ONS.

1. 1. 5 Excavat i on of Ar ea C

The wor k cover ed by t hi s sect i on, and i ncl uded i n t he payment i t em

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DREDGI NG AREA C, i ncl udes dr edgi ng i n Ar ea C, as desi gnat ed on Dr awi ng 83/ 30, and di sposal . Thi s ar ea may cont ai n cont ami nat ed mat er i al . The l i mi t s of t he cont ami nat ed ar ea wi l l be del i neat ed by r andom i n- si t u sampl i ng as speci f i ed i n Sect i on 02 32 16. 00 08 SAMPLI NG, ANALYSES, AND STAGI NG OF SEDI MENT MATERI ALS. Cont ami nat ed mat er i al may must be di sposed at a per mi t t ed sol i d wast e di sposal f aci l i t y as speci f i ed i n Sect i on 01 74 19. 00 08 CONSTRUCTI ON AND DEMOLI TI ON WASTE MANAGEMENT. Payment f or di sposal of cont ami nat ed mat er i al wi l l be made under payment I t em

DI SPOSAL OF CONTAMI NATED DREDGED MATERI AL.

1. 2 REFERENCES

The publ i cat i ons l i s t ed bel ow f or m a par t of t hi s speci f i cat i on t o t he ext ent r ef er enced. The publ i cat i ons ar e r ef er r ed t o i n t he t ext by basi c desi gnat i on onl y.

PENNSYLVANI A DEPARTMENT OF TRANSPORTATI ON ( PDT)

PDT 408 ( 2016) Speci f i cat i ons

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

EM 385- 1- 1 ( 2014) Saf et y and Heal t h Requi r ement s Manual

EM 1110- 2- 1003 ( 2013) Hydr ogr aphi c Sur veyi ng

U. S. NATI ONAL ARCHI VES AND RECORDS ADMI NI STRATI ON ( NARA)

33 CFR 156 ( 2008) Navi gat i on and Navi gabl e Wat er s, Oi l and Hazar dous Mat er i al Tr ansf er Operations

1. 3 ORDER OF WORK AND DREDGI NG RESTRI CTI ONS

1. 3. 1 Excavat i on f or St i l l i ng Basi n and Abut ment Pr ot ect i on Wal l

a. Remove der r i ck st ones f r om t he pl anned f oot pr i nt of st i l l i ng basi n and abut ment pr ot ect i on wal l .

b. Excavat i on f or t he st i l l i ng basi n and abut ment pr ot ect i on wal l must commence at t he Lef t Bank and pr oceed acr oss t he dam t owar d t he l ock. Excavat i on must be conf i ned t o t he l i mi t s shown f or each phase of const r uct i on.

c. Excavat i on wi l l not be per mi t t ed beyond t he l i mi t s of const r uct i on whi ch cannot be compl et ed pr i or t o wi nt er suspensi on of wor k i n each phase wi t hout pr i or appr oval of t he Cont r act i ng Of f i cer .

d. Removal of t he t r ai ni ng di ke may be per f or med at any t i me dur i ng whi ch i t i s possi bl e t o c l ose t he associ at ed dam gat es. See al so Sect i on 01 35 00. 00 08 SPECI AL PROCEDURES, par agr aph DAM GATE

OPERATI NG SCHEDULE.

e. Ther e ar e no r est r i ct i ons on excavat i on f or t he st i l l i ng basi n and abut ment pr ot ect i on wal l f or f i sh spawni ng.

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1. 3. 2 Fl oodway and Appr oach Dr edgi ng

a. Dr edgi ng downst r eam of t he St i l l i ng Basi n and Abut ment Pr ot ect i on Wal l , f l oodway dr edgi ng, and appr oach dr edgi ng must shall not commence unt i l t he abut ment pr ot ect i on wal l and scour pr ot ect i on havehas been compl et ed and accept ed.

b. Remove der r i ck st ones f r om t he pl anned f oot pr i nt of st i l l i ng basi n and abut ment pr ot ect i on wal l .

c. Dr edgi ng of t he downst r eam f l oodway and appr oach must shall st ar t at t he downst r eam end of t he st i l l i ng basi n and pr oceed downst r eam.

Thi s or der of wor k may be adj ust ed by t he Gover nment based on unf or eseen ci r cumst ances and a modi f i cat i on t o t he cont r act may be required.

d. Dr edgi ng of mat er i al under t hi s cont r act must onl y be per f or med by mechani cal dr edgi ng.

e. Dr edgi ng downst r eam of t he St i l l i ng Basi n and Abut ment Pr ot ect i on Wal l wi l l not be per mi t t ed f r om 1 Apr i l t hr ough 1 Jul y, due t o f i sh spawning.

1. 4 SUBMITTALS

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 . Submi t t he f ol l owi ng 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

Dr edgi ng Per sonnel Qual i f i cat i ons; G, RO

Submi t f or appr oval t he qual i f i cat i ons of al l per sonnel oper at i ng t he bucket dr edge.

Vessel s And Equi pment ; G, RO

SD- 06 Test Repor t s

Sur vey Repor t s; G, RO

DGPS Posi t i oni ng; G, RO

The r eal t i me posi t i oni ng of t he dr edge must be r ecor ded, by DGPS, on a comput er di sk ever y 1 mi nut e and submi t t ed on a dai l y basis.

Dai l y Cl amshel l Bucket Posi t i oni ng Recor ds; G, RO

I nspect or ' s Repor t ; G, RO

1. 5 TYPE OF MATERI AL TO BE REMOVED

The mat er i al t o be r emoved under t hi s cont r act i s mai nl y new mat er i al wi t h some mi nor shoal i ng t hat has occur r ed si nce t he channel was l ast dr edged.

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The mat er i al consi st s pr i mar i l y of sands and gr avel , and may cont ai n l esser amount s of cobbl es, boul der s, coal f i nes, s i l t s and cl ays. The t ype of t he mat er i al i s bel i eved t o be as i ndi cat ed by t he r esul t s of Gover nment - conduct ed sampl i ng.

The exi st i ng t r ai ni ng di ke l ocat ed gener al l y downst r eam of Pi er 2, i s const r uct ed of PDT 408 si ze R- 7 and R- 8 st one. The st one f r om t he t r ai ni ng di ke may be ut i l i zed f or scour pr ot ect i on.

I f dur i ng dr edgi ng oper at i ons, t he Cont r act or encount er s mat er i al suspect ed of cont ami nat i on by pet r ol eum pr oduct s or ot her mat er i al s, t he Cont r act or must st op oper at i ons and not i f y t he Cont r act i ng Of f i cer .

Cont ami nat ed mat er i al encount er ed out si de of Ar ea C as desi gnat ed on Dr awi ng 83/ 30 wi l l be handl ed as a modi f i cat i on t o t he cont r act .

1. 6 SI TE CONDI TI ONS

Bi dder s ar e expect ed t o exami ne t he si t e of t he wor k and deci de f or t hemsel ves as t o t he condi t i ons af f ect i ng t hei r oper at i ons. See Sect i on

00 70 00 CONDI TI ONS OF THE CONTRACT, FAR 52. 236- 3 SI TE I NVESTI GATI ON AND

CONDI TI ONS AFFECTI NG THE WORK. The ent i r e wor k s i t e i s desi gnat ed as a har d hat ar ea i n accor dance wi t h EM 385- 1- 1.

1. 7 DREDGI NG PERSONNEL QUALI FI CATI ONS

Al l per sonnel oper at i ng t he bucket dr edge must have a mi ni mum of 5 year s exper i ence usi ng t he equi pment , i ncl udi ng exper i ence usi ng t he comput er i zed posi t i oni ng syst em on t he bucket dr edge. Land based exper i ence usi ng GPS bucket excavat i on wi l l be al l owed.

1. 8 DI FFERENTI AL GLOBAL POSI TI ONI NG SYSTEM ( DGPS) EQUI PMENT

The Cont r act or must have a di f f er ent i al GPS, and must conduct hi s sur vey wor k i n accor dance wi t h t he r equi r ement s f or a Cl ass 1 Sur vey, as def i ned i n t he U. S. Ar my Cor ps of Engi neer s EM 1110- 2- 1003. Pr ovi de r eal t i me DGPS posi t i oni ng of t he dr edge, on a comput er scr een dur i ng dr edgi ng oper at i ons, and have t he capabi l i t y of pl ayback i n 1 mi nut e i nt er val s.

Recor d t he dr edge posi t i on on a di sk ever y 1 mi nut e and submi t t hi s t o t he Cont r act i ng Of f i cer on a dai l y basi s. Pr ovi de dat a i n ESRI Ar cGI S 10. x Shapef i l e f or mat ( . shp) , i ncl udi ng al l component s and ext ensi ons, or i n a Spat i al Dat a St andar d compl i ant geodat abase. Real t i me posi t i oni ng dat a must i ncl ude nor t hi ng, east i ng, el evat i on, dat e and t i me of i nf or mat i on.

1. 9 CLAMSHELL BUCKET POSI TI ONI NG

For al l dr edgi ng and f or each dr edge empl oyed under t hi s Cont r act , a comput er i zed posi t i oni ng syst em capabl e of r epr esent i ng t he hor i zont al and ver t i cal posi t i on of t he c l amshel l bucket at any gi ven t i me t hr oughout t he dr edgi ng cycl e must be ut i l i zed. Hor i zont al and ver t i cal posi t i oni ng of t he bucket must be r ecor ded at i nt er val s not gr eat er t han one mi nut e i n dur at i on. The hor i zont al and ver t i cal ( x, y, z) posi t i ons of t he bucket must be pr ovi ded t o t he Cont r act i ng Of f i cer i n an appr oved el ect r oni c f or mat . Commer ci al l y avai l abl e syst ems such as t hose of f er ed by compani es under t he r egi st er ed t r ademar ks of Dr edgepak, Wi nops, or s i mi l ar pr opr i et ar y syst ems devel oped by t he Cont r act or woul d be consi der ed sat i sf act or y. The syst em must pr oduce a r ecor d of t he hor i zont al and ver t i cal wor ki ng l ocat i ons, of t he bucket , i n a cont i nual di spl ay and i n a submi t t al sat i sf act or y t o t he Cont r act i ng Of f i cer .

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1. 10 GOVERNMENT PLANT

The Gover nment r eser ves t he r i ght t o ut i l i ze anot her pl ant i n any of t he wor k ar eas dur i ng t he cont r act per i od.

1. 11 QUANTI TY OF MATERI AL

1. 11. 1 Excavat i on f or St i l l i ng Basi n and Abut ment Pr ot ect i on Wal l

The t ot al est i mat ed amount of mat er i al t o be r emoved f r om wi t hi n t he speci f i ed l i mi t s of t he st i l l i ng basi n and abut ment pr ot ect i on wal l i s shown on t he Bi d Schedul e.

1. 11. 2 Fl oodway and Appr oach Dr edgi ng

The quant i t i es l i s t ed ar e est i mat es onl y.

1. 12 FUEL OI L HANDLI NG

Ensur e t hat al l f uel oi l t r ansf er oper at i ons t o or f r om t he pl ant compl y wi t h al l Feder al , st at e, and muni ci pal l aws, codes and r egul at i ons.

I ncor por at e i n t he acci dent pr event i on pr ogr am, submi t t ed i n compl i ance wi t h Sect i on 00 70 00 CONDI TI ONS OF THE CONTRACT, FAR 52. 236- 13 ACCI DENT PREVENTI ON, suf f i c i ent i nf or mat i on t o demonst r at e compl i ance wi t h 33 CFR 156 and any ot her appl i cabl e l aws, codes, and r egul at i ons.

1. 13 QUALI TY ASSURANCE

Submi t a compl et e l i s t of al l vessel s and equi pment t o be used dur i ng t he cont r act , i ncl udi ng al l dr edgi ng pl ant s, suppor t i ng vessel s, and equi pment . I ncl ude on t he l i s t t he t ypes, t he number s of each, t he dr af t of each, and al l ot her per t i nent i nf or mat i on. The capaci t y of al l bar ges must be i ncl uded i n t he equi pment l i s t . Al so i ncl ude i n t he l i s t t he sur vey vessel , sur vey cr ew, t ype of sur vey equi pment , and sof t war e t hat may be used.

1. 14 FI NAL EXAMI NATI ON AND ACCEPTANCE

1. 14. 1 Excavat i on f or St i l l i ng Basi n and Abut ment Pr ot ect i on Wal l

I mmedi at el y bef or e commenci ng any ot her wor k r equi r i ng under wat er excavat i on oper at i ons t o be compl et ed, t he excavat ed ar ea shal l be t hor oughl y exami ned by t he Cont r act or under t he di r ect i on of t he Cont r act i ng Of f i cer by soundi ng or by sweepi ng, or bot h, as det er mi ned by t he Cont r act i ng Of f i cer . The Cont r act i ng Of f i cer or hi s aut hor i zed r epr esent at i ve shal l be not i f i ed when soundi ngs and/ or sweepi ngs ar e t o be made, and shal l be per mi t t ed t o accompany t he sur vey par t y. The Cont r act or shal l f ur ni sh t he r esul t s of al l sur veys t o t he Cont r act i ng Of f i cer i n accor dance wi t h par agr aph I NSPECTI ON REPORTS bel ow. I f any poi nt s i dent i f i ed on t he sur vey sect i ons do not meet t he speci f i ed cont r act t empl at e, t he Cont r act or shal l be r equi r ed t o r emove addi t i onal mat er i al , and t he ar ea shal l be r e- sur veyed. Al l sur vey i nf or mat i on shal l be submi t t ed and t he ar eas accept ed by t he Cont r act i ng Of f i cer bef or e commenci ng any ot her const r uct i on oper at i ons i n t he ar ea whi ch ar e dependent on t he compl et i on of t he under wat er excavat i on oper at i ons. The sur vey r epor t s f or al l sur veys conduct ed by t he Cont r act or , shal l be del i ver ed t o t he Cont r act i ng Of f i cer . These r equi r ement s do not r el i eve t he Cont r act or of t he obl i gat i on t o r epor t f ai l ur es i mmedi at el y. Such r epor t s of f ai l ur es and t he act i on t aken shal l be conf i r med i n wr i t i ng.

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The Cont r act or shal l per f or m sur veys ( soundi ngs or sweepi ngs) of t he dr edgi ng oper at i ons and shal l r epor t t he gener al pr ogr ess of al l dr edgi ng oper at i ons t o t he Cont r act i ng Of f i cer no l at er t han 24 hour s f ol l owi ng t he compl et i on of t he sur vey.

1. 14. 2 Fl oodway and Appr oach Dr edgi ng

As soon as pr act i cabl e af t er t he compl et i on of t he ent i r e wor k or any sect i on t her eof ( i f t he wor k i s di v i ded i nt o sect i ons) as i n t he opi ni on of t he Cont r act i ng Of f i cer wi l l not be subj ect t o damage by f ur t her oper at i ons under t he cont r act , such wor k wi l l be t hor oughl y exami ned at t he cost and expense of t he Gover nment by soundi ng or by sweepi ng, or bot h, as det er mi ned by t he Cont r act i ng Of f i cer . 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 wi l l be r equi r ed t o r emove same by dr aggi ng t he bot t om or by dr edgi ng at t he cont r act r at e f or dr edgi ng, but i f t he bot t om i s sof t and t he shoal ar eas ar e smal l and f or m no mat er i al obst r uct i on t o navi gat i on, t he r emoval of such shoal may be wai ved by t he di scr et i on of t he Cont r act i ng Of f i cer . The Cont r act or or hi s aut hor i zed r epr esent at i ve wi l l be not i f i ed when soundi ngs and/ or sweepi ngs ar e t o be made, and wi l l be per mi t t ed t o accompany t he sur vey par t y. Shoul d mor e t han t wo soundi ngs or sweepi ng 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 r emoval of shoal s di scl osed at a pr i or soundi ng or sweepi ng, t he cost of such t hi r d and any subsequent soundi ng or sweepi ng oper at i ons wi l l be char ged agai nst t he Cont r act or . The r at e of each day i n whi ch t he Gover nment pl ant i s engaged i n such soundi ng or sweepi ng oper at i ons and/ or i s enr out e t o or f r om t he si t e or hel d, f or t he Cont r act or ' s conveni ence, at or near t he s i t e f or t hese oper at i ons shal l be $5, 500. 00, except on Sat ur day, Sunday and hol i days when t he r at e shal l be $6, 000. 00.

1. 14. 3 Fi nal Accept ance

Fi nal accept ance of t he whol e or a 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 must 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 wor k.

1. 15 CONTI NUI TY OF WORK

No payment wi l l be made f or wor k done i n any ar ea desi gnat ed by t he Cont r act i ng Of f i cer unt i l t he f ul l dept h r equi r ed under t he cont r act i s secur ed i n t he whol e of such ar ea, unl ess pr event ed by l edge r ock, nor wi l l payment be made f or excavat i on i n any ar ea not adj acent t o and i n pr ol ongat i on of ar eas wher e f ul l dept h has been secur ed except by deci s i on of t he Cont r act i ng Of f i cer . Shoul d any such nonadj acent ar ea be excavat ed t o f ul l dept h dur i ng t he oper at i ons car r i ed on under t he cont r act , payment f or al l wor k t her ei n may be def er r ed unt i l t he r equi r ed dept h has been made i n t he ar ea i nt er veni ng. 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 gages or r anges cannot be seen or pr oper l y f ol l owed.

1. 16 SHOALING

I f bef or e t he cont r act i s compl et ed, shoal i ng occur s i n any sect i on pr evi ousl y accept ed, i ncl udi ng shoal i ng i n t he f i ni shed channel , because of t he nat ur al l ower i ng of t he s i de sl opes, r edr edgi ng at cont r act pr i ce, wi t hi n t he l i mi t s of avai l abl e f unds, may be done i f agr eeabl e t o bot h t he

SECTI ON 35 20 23 Page 8

Cont r act or and t he Cont r act i ng Of f i cer .

PART 2 PRODUCTS

Not used.

PART 3 EXECUTI ON

3. 1 INSPECTION

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.

3. 2 DI SPOSAL OF EXCAVATED MATERI AL

3. 2. 1 General

The mat er i al excavat ed, except mat er i al whi ch i s det er mi ned t o be cont ami nat ed, must be t r anspor t ed t o t he Gover nment - owned Vi ct or y Hol l ow Si t e and dewat er ed ( i f necessar y) pr i or t o of f l oadi ng. The mat er i al wi l l be t r anspor t ed t o Upl and Fi l l Pl acement Ar ea, deposi t ed, and gr aded by ot her s. Cont ami nat ed mat er i al must be di sposed of i n accor dance wi t h Sect i on 01 74 19. 00 08 CONSTRUCTI ON AND DEMOLI TI ON WASTE MANAGEMENT.

3. 2. 2 Mi spl aced Mat er i al

Any mat er i al deposi t ed i n pl aces ot her t han t hose desi gnat ed or appr oved by t he Cont r act i ng Of f i cer , or whi ch escapes f r om such pl aces, i s pr ohi bi t ed, and wi l l not be pai d f or . The Cont r act or may be r equi r ed t o r emove such mi spl aced mat er i al i n accor dance wi t h Sect i on 00 70 00

CONDI TI ONS OF THE CONTRACT, DFARS 252. 236- 7002 OBSTRUCTI ON OF NAVI GABLE

WATERWAYS, and deposi t i t wher e di r ect ed, at no addi t i onal cost t o t he Government.

3. 2. 3 Di sposal of Excavat ed Dr edgi ng Mat er i al

Excavat e dr edge mat er i al by bucket dr edgi ng. Pr ovi de f or saf e t r anspor t at i on and di sposal of dr edged mat er i al s. Tr anspor t dr edged mat er i al t o t he Vi ct or y Hol l ow Si t e f or of f l oadi ng and di sposal by ot her s as speci f i ed i n Sect i on 01 74 19. 10 08 VI CTORY HOLLOW SI TE.

Cont r act or - f ur ni shed di sposal ar eas, r ehandl i ng basi ns or encl osur es wi l l not be per mi t t ed under t hi s cont r act . The deposi t of dr edged mat er i al s i n unaut hor i zed pl aces i s not al l owed. Compl y wi t h r ul es and r egul at i ons of l ocal por t and har bor gover ni ng aut hor i t i es.

3. 2. 3. 1 Hopper Dr edgi ng

Hopper dr edgi ng wi l l not be per mi t t ed under t hi s cont r act .

3. 2. 3. 2 Hydr aul i c Dr edgi ng

Hydr aul i c dr edgi ng wi l l not be per mi t t ed under t hi s cont r act .

3. 2. 3. 3 Mechani cal Dr edgi ng

Excavat e mat er i al by mechani cal dr edgi ng ( bucket , dr ag, or di pper ) , l oaded

SECTI ON 35 20 23 Page 9 t o over f l ow onl y. Mat er i al must be pl aced by a means t hat wi l l pr ecl ude any l oss of mat er i al t o t he r i ver af t er l oadi ng and pr i or t o deposi t i on.

Speci al car e must be t aken t o ensur e t hat scows do not l eak dur i ng any por t i on of t he wor k.

3. 2. 3. 4 Gover nment Qual i t y Cont r ol Moni t or

The Gover nment may pl ace a Gover nment moni t or aboar d t he Cont r act or ' s dr edge( s) or suppor t i ng vessel s t o moni t or qual i t y cont r ol condi t i ons dur i ng dr edgi ng and di sposal oper at i ons.

3. 2. 4 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. 2. 5 Di sposal of Der r i ck St one and Tr ai ni ng Di ke Rock

The r emoved der r i ck st ones and R- 7 and R- 8 r ock may be used f or scour pr ot ect i on as shown on t he dr awi ngs.

3. 3 ACCESS TO THE OFF- LOADI NG FACI LI TY

Wat er access t o t he Of f - l oadi ng Faci l i t y at t he Vi ct or y Hol l ow Si t e wi l l be dr edged and mai nt ai ned by t he cont r act or oper at i ng t he Vi ct or y Hol l ow Si t e, as r equi r ed, t o suppor t hi s oper at i ons.

3. 4 DREDGI NG FOR STI LLI NG BASI N AND ABUTMENT PROTECTI ON WALL

3. 4. 1 Li mi t s of Wor k

The f ol l owi ng par agr aphs appl y onl y t o dr edgi ng f or t he St i l l i ng Basi n and Abut ment Pr ot ect i on Wal l . The wor k shal l be l i mi t ed t o a maxi mum l engt h of 250 f eet f r om t he downst r eam edge of t he exi st i ng apr on.

3. 4. 2 Removal of Obst r uct i ons

I t i s ant i c i pat ed t hat much of t he r i ver mat er i al i n t he v i c i ni t y of t he abut ment pr ot ect i on wal l dr i v i ng l i ne consi st s of der r i ck st one, r i pr ap, r andom f i l l and al l uvi um, and mi scel l aneous debr i s ( pi eces of st eel , concr et e r ubbl e, wood, et c. ) , whi ch accumul at ed over t i me. Those mat er i al s posi ng a pot ent i al obst r uct i on t o t he dr i v i ng, dr i l l i ng, or pr oper i nst al l at i on ( e. g. , t o meet necessar y t ol er ances) of t he abut ment pr ot ect i on wal l component s must be i ncr ement al l y r emoved and be concur r ent l y r epl aced t o t he pl anned subgr ade l evel of t he pr ot ect i on wal l cap/ sl ab. The r epl acement f i l l must consi st of obst r uct i on- f r ee, r emnant excavat ed gr anul ar mat er i al and/ or i mpor t ed aggr egat e base cour se mat er i al .

I ncr ement al l y pr e- excavat e t o r emove obst r uct i ons t o el evat i on 715. 0 ( or deeper i f necessar y and appr oved by t he Cont r act i ng Of f i cer ) al ong t he abut ment pr ot ect i on wal l al i gnment and concur r ent l y backf i l l t o r est or e gr ades t o t he pl anned subgr ade l evel of t he pr ot ect i on wal l cap/ sl ab. The pr e- excavat i on and obst r uct i on r emoval may pr ogr ess down t o el evat i on

715. 0 ( base of exi st i ng abut ment wal l ) bef or e t he f ol l owi ng r est r i ct i ons on deeper excavat i on shal l appl y. Pr e- excavat i on bel ow el evat i on 715. 0 must commence at t he apr on and pr ogr ess i ncr ement al l y wi t h concur r ent backf i l l i ng i n a downst r eam di r ect i on, unl ess al t er nat i ve pr ocedur es ar e pr oposed i n wr i t i ng by t he Cont r act or and ar e appr oved by t he Cont r act i ng Of f i cer . The pr e- excavat i on must t ar get a l ocal i zed ar ea and be l i mi t ed

SECTI ON 35 20 23 Page 10 t o a maxi mum excavat i on wi dt h of 15 f eet measur ed per pendi cul ar t o t he dam ( par al l el t o r i ver f l ow) , af t er whi ch t he excavat i on must be i mmedi at el y backf i l l ed wi t h obst r uct i on- f r ee mat er i al t o at l east el evat i on 715. 0 bef or e pr ogr essi ng wi t h pr e- excavat i on, obst r uct i on r emoval , and backf i l l i ng i n t he next adj acent ar ea.

Dr edgi ng f or t he st i l l i ng basi n i ncl udes r emovi ng t he r i ver bed mat er i al s t o gr ades and el evat i ons shown on t he dr awi ngs t o f or m t he 3H: 1V sl ope down f r om t he exi st i ng st i l l i ng basi n f or pl acement of 18" t hi ck gr anul ar subgr ade and gr out bag. I t i s ant i c i pat ed t hat excavat i on i n r ock i s not r equi r ed f or t he pl acement of gr out bags.

3. 4. 3 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, must r emai n or become t he pr oper t y of t he Gover nment and must 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. 4. 4 Saf et y of St r uct ur es

The pr osecut i on of wor k must ensur e t he st abi l i t y of pi er s, abut ment wal l , bul kheads, and ot her st r uct ur es 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.

The Cont r act or must r epai 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, 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. 5 FLOODWAY AND APPROACH DREDGI NG

The f ol l owi ng par agr aphs appl y onl y t o dr edgi ng downst r eam of t he St i l l i ng Basi n and Abut ment Pr ot ect i on Wal l , upst r eam of t he dam, and upst r eam and downst r eam l ock appr oaches.

3. 5. 1 Over dept h Dr edgi ng And Si de Sl opes

3. 5. 1. 1 General

Al l dr edgi ng dept hs ar e r ef er enced t o t he cur r ent Pool El evat i on.

3. 5. 1. 2 Over dept h Dr edgi ng

To cover unavoi dabl e i naccur aci es of dr edgi ng pr ocesses, mat er i al act ual l y r emoved t o a dept h of 1 f oot bel ow t he dept h speci f i ed and wi t hi n t he dr edgi ng l i mi t s wi l l be measur ed and pai d f or at t he cont r act uni t pr i ce f or r emoval and di sposal of mat er i al .

3. 5. 1. 3 Si de and End Sl opes

Si de sl opes of 3H t o 1V must be const r uct ed. Dr edgi ng on si de sl opes must f ol l ow, as c l osel y as pr act i cabl e, t he l i nes i ndi cat ed or speci f i ed.

Comput at i on of payment quant i t i es wi l l be t o t he speci f i ed channel l i mi t s pl us t he di st ance f r om t he channel l i mi t s t o t he i nt er sect i on of t he s i de sl opes wi t h t he sur f ace. The Cont r act or wi l l be per mi t t ed t o per f or m box cut s t o obt ai n t he r equi r ed si de sl opes, however , payment f or channel s i de s l opes wi l l be made st r i ct l y based on t he def i ned payment s l ope of 3H t o 1V f r om t he channel edge. Ther e wi l l not be any compensat ed sl ope cal cul at i ons f or payment , nor any payment f or excessi ve dr edgi ng beyond t he 1 f oot al l owabl e over dept h. The 1 f oot al l owabl e over dept h must be

SECTI ON 35 20 23 Page 11 per f or med as a box cut wi t h no si de sl opes. Tr ansi t i on must be made t o exi st i ng r i ver bot t om at t he upst r eam and downst r eam l i mi t s of t he dr edgi ng ar ea. ( See dr awi ngs f or t ypi cal sect i ons.

3. 5. 1. 3. 1 Excessi ve Dr edgi ng

Mat er i al t aken f r om beyond t he l i mi t s speci f i ed i n t he Par agr aphs t i t l ed:

Over dept h Dr edgi ng and Si de and End Sl opes, wi l l be deduct ed f r om t he t ot al amount dr edged as excessi ve dr edgi ng f or whi ch payment wi l l not be made. Not hi ng her ei n shal l be const r ued t o pr event payment f or t he r emoval of shoal s per f or med i n accor dance wi t h t he appl i cabl e r equi r ement s speci f i ed i n par agr aphs FI NAL EXAMI NATI ON AND ACCEPTANCE and SHOALI NG.

3. 5. 2 Conduct Of Dr edgi ng Wor k

3. 5. 2. 1 I nt er f er ence wi t h Navi gat i on

Mi ni mi ze i nt er f er ence wi t h t he use of channel s and passages. The Cont r act i ng Of f i cer wi l l di r ect t he shi f t i ng or movi ng of dr edges or t he i nt er r upt i on of dr edgi ng oper at i ons t o accommodat e t he movement of vessel s and f l oat i ng equi pment , i f necessar y.

3. 5. 2. 2 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.

3. 5. 2. 3 Plant

Mai nt ai n t he pl ant , scows, coami ngs, bar ges, pi pel i nes, and associ at ed equi pment t o meet t he r equi r ement s of t he wor k. Pr ompt l y r epai r l eaks or br eaks al ong pi pel i nes. Remove dr edged mat er i al pl aced due t o l eaks and breaks.

3. 5. 2. 4 Saf et y of St r uct ur es

The pr osecut i on of wor k must ensur e t he st abi l i t y of pi er s, bul kheads, and ot her st r uct ur es 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 of damages r esul t i ng f r om dr edgi ng oper at i ons shal l be at t he Cont r act or ' s expense i f t he damage was caused by devi at i on f r om t he cont r act .

3. 5. 2. 5 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. 6 RECORDS

Dai l y c l amshel l bucket posi t i oni ng r ecor ds must be t r ansmi t t ed el ect r oni cal l y t o t he Cont r act i ng Of f i cer dai l y at t he same t i me as t he I nspect or ' s Repor t .

- - End of Sect i on - -

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3.6 RECORDS