Site_0521-41_Amend_4_Specs.pdf

SOLICIATION NO. W91238-19-B-0012

1 of 1 AM0004

FEATHER RIVER RIGHT BANK

SUTTER COUNTY, CALIFORNIA

PL 84-99 EMERGENCY LEVEE REPAIRS

SITE 0521-41

AMENDMENT 0004 - SUMMARY:

A) SPECIFICATION 2213

1) Replaced entire section 31 56 14.

10 September 2019

PL 84- 99 Emer gency Levee Repai r Spec No. 2213 Si t e 0521- 41 - Feat her Ri ver

SECTI ON TABLE OF CONTENTS

DI VI SI ON 31 - EARTHWORK

SECTI ON 31 56 14

SOI L- BENTONI TE ( SB) CUTOFF WALL - OPEN TRENCH

04/15

PART 1 GENERAL

1. 1 SUMMARY

1. 2 REFERENCES

1. 3 GENERAL CONDI TI ONS

1. 3. 1 Li nes and Gr ades

1. 3. 2 Conduct of Wor k

1. 3. 3 Access and Ramps

1. 3. 4 Pr ot ect i on of Exi st i ng Faci l i t i es

1. 3. 5 Per mi t s

1. 3. 6 Const r uct i on Met hod

1. 3. 7 Sequenci ng of t he Wor k

1. 3. 8 Wat er f or Const r uct i on

1. 4 DEFI NI TI ONS

1. 4. 1 Cut of f Wal l

1. 4. 2 Sl ur r y Tr ench

1. 4. 3 Bent oni t e

1. 4. 4 Sl ur r y Met hod of Excavat i on

1. 4. 5 Bent oni t e Sl ur r y

1. 4. 6 SB Backf i l l

1. 4. 7 Gr ound Wat er Level

1. 4. 8 Lead- i n Tr ench

1. 4. 9 Wor ki ng Sur f ace

1. 4. 10 Key- I n Mat er i al

1. 4. 11 Sl ur r y Cut of f Wal l Speci al i s t

1. 4. 12 Sl ur r y Cut of f Wal l Excavat i on Equi pment Oper at or

1. 4. 13 Tr ench Qual i t y Cont r ol Techni c i an ( TQCT)

1. 4. 14 Tr ench Logger

1. 4. 15 Qual i t y Cont r ol Engi neer

1. 4. 16 Qual i t y Cont r ol Labor at or y

1. 4. 17 Qual i t y Cont r ol Repor t

1. 4. 18 Excavat i on Ref usal

1. 4. 19 Obst r uct i ons

1. 4. 20 Remedi at i on Pl an

1. 4. 21 El evat i on Dat um

1. 4. 22 Mat er i al Saf et y Dat a Sheet ( MSDS)

1. 5 SUBMI TTALS

1. 6 QUALI FI CATI ONS

1. 6. 1 Cont r act or Qual i f i cat i ons

1. 6. 2 Qual i f i cat i ons of Sl ur r y Cut of f Wal l Speci al i s t and Sl ur r y

Cut of f Wal l Excavat i on Equi pment Oper at or s

1. 6. 2. 1 Sl ur r y Cut of f Wal l Speci al i s t

1. 6. 2. 2 Sl ur r y Cut of f Wal l Excavat i on Equi pment Oper at or

1. 6. 3 TQCT

1. 6. 4 Tr ench Logger

1. 6. 5 Qual i t y Cont r ol Engi neer

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AM0004

1. 6. 6 Qual i t y Cont r ol Labor at or y

1. 7 DELI VERY, STORAGE, AND HANDLI NG

1. 8 GEOTECHNI CAL SI TE CONDI TI ONS

1. 8. 1 Expl or at i on

1. 8. 2 Subsur f ace Condi t i ons

1. 8. 3 Gr ound Wat er

1. 8. 4 Knowl edge of Subsur f ace Dat a

PART 2 PRODUCTS

2. 1 GENERAL

2. 2 BENTONI TE

2. 3 WATER

2. 3. 1 Sour ce

2. 3. 2 Wat er Qual i t y

2. 4 BACKFI LL MI X DESI GN

2. 5 PROPERTI ES OF BENTONI TE SLURRY I N MI XI NG AREA

2. 6 PROPERTI ES OF BENTONI TE SLURRY I N TRENCH

2. 7 SB BACKFI LL

2. 7. 1 Soi l f or Backf i l l

2. 7. 2 SB Backf i l l

2. 8 MATERI AL STORAGE FACI LI TY

2. 9 ENVI RONMENTAL PROTECTI ON

2. 10 DI SPOSAL SI TE

2. 11 TRENCH PLATES

2. 12 EQUI PMENT

2. 12. 1 Tr ench Excavat i on Equi pment

2. 12. 2 Bent oni t e Sl ur r y Mi x i ng Equi pment

2. 12. 3 Sl ur r y Desander

2. 12. 4 Fi el d Labor at or y Equi pment

2. 12. 5 Sl ur r y Tr anspor t i ng Equi pment

2. 12. 6 Haul i ng Equi pment

2. 12. 7 Equi pment Wei ght , Speed, and Wi dt h

2. 13 CONSTRUCTI ON STAKI NG

2. 13. 1 I ni t i al and Fi nal El evat i on

2. 14 PERMANENT METAL MARKER MONUMENTS

PART 3 EXECUTI ON

3. 1 GENERAL

3. 1. 1 SB Cut of f Wal l I mpl ement at i on Pl an

3. 2 SI TE WORK

3. 3 WORKI NG SURFACE

3. 3. 1 Const r uct i on St aki ng

3. 3. 2 Const r uct i on of Wor ki ng Sur f ace

3. 4 SLURRY TRENCH EXCAVATI ON

3. 4. 1 Gener al

3. 4. 2 St ar t er Tr ench

3. 4. 3 Ver t i cal Tol er ance

3. 4. 4 Bot t om Dept h

3. 4. 5 Tr ench St abi l i t y and Sl ur r y Loss

3. 4. 6 Cont i nui t y of Cut of f Wal l

3. 4. 6. 1 Cut of f Wal l Excavat i on

3. 4. 6. 2 Connect i on t o Exi st i ng SB Cut of f Wal l

3. 4. 7 Tr ench Excavat i on

3. 4. 8 Tr ench Bot t om Cl eani ng

3. 4. 9 Desandi ng

3. 5 SB CUTOFF WALL CONSTRUCTI ON

3. 5. 1 SB Mi xi ng Ar eas

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3. 5. 2 Mi x i ng SB Backf i l l

3. 5. 3 Pl acement of SB Backf i l l

3. 5. 4 Tempor ar y Cap

3. 5. 5 Set t l ement Pl at e I nst al l at i on and Moni t or i ng

3. 5. 6 Removal of Tempor ar y Cap and Set t l ement Pl at es

3. 5. 7 Hi gh Wat er Event

3. 5. 8 Cut of f Wal l Pr ot ect i on

3. 5. 9 Cl eanup

3. 6 AS- BUI LT PROFI LE

3. 7 MI XI NG WATER AND WASH WATER

3. 7. 1 Mi x i ng Wat er

3. 7. 2 Wash Wat er

3. 8 QUALI TY CONTROL

3. 8. 1 Gener al

3. 8. 2 Access t o Wor k Si t e

3. 8. 3 Cut of f Wal l Mi x Quant i t i es

3. 8. 4 Mi x i ng Ar ea Sampl i ng

3. 8. 4. 1 Sl ur r y Sampl i ng i n Mi xi ng Ar ea

3. 8. 4. 2 Sl ur r y Sampl i ng i n Tr ench

3. 8. 5 Loggi ng of Tr ench Excavat i on

3. 8. 6 Tr ench Soundi ngs

3. 8. 7 Sl ur r y Sampl i ng

3. 8. 7. 1 I n Mi xi ng Ar ea

3. 8. 7. 2 I n Tr ench

3. 8. 8 Backf i l l Sampl i ng

3. 8. 9 Pr ot ocol f or Cust ody of Sampl es

3. 8. 10 Test i ng

3. 8. 10. 1 Sl ur r y i n Mi xi ng Ar eas

3. 8. 10. 2 Bent oni t e Sl ur r y i n Tr ench

3. 8. 10. 3 SB Backf i l l Sl ump Test i ng

3. 8. 10. 4 Labor at or y Test i ng

3. 8. 10. 5 Hydr aul i c Conduct i v i t y Test i ng

3. 8. 10. 6 Coor di nat i on of Test i ng Labor at or i es

3. 8. 11 QUALI TY CONTROL REPORTS

3. 8. 11. 1 Dai l y Qual i t y Cont r ol Repor t

3. 8. 11. 2 Weekl y Qual i t y Cont r ol Repor t

3. 8. 12 Qual i t y Cont r ol Recor ds

3. 8. 13 Rej ect ed Cut of f Wal l Sect i ons

3. 9 QUALI TY ASSURANCE TESTI NG

3. 10 CUTOFF WALL CLOSE OUT AND ACCEPTANCE

3. 10. 1 Const r uct i on Recor ds

3. 10. 2 Const r uct i on Document at i on

3. 10. 3 Const r uct i on Qual i t y Cont r ol Test Resul t s

3. 10. 4 Const r uct i on Log

3. 10. 5 As- Bui l t Dr awi ng

3. 10. 6 Accept ance

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

SECTI ON 31 56 14 Page 3

SECTI ON 31 56 14

SOI L- BENTONI TE ( SB) CUTOFF WALL - OPEN TRENCH

04/15

PART 1 GENERAL

1. 1 SUMMARY

The wor k cover ed by t hi s sect i on consi st s of f ur ni shi ng al l pl ant , l abor , equi pment , and mat er i al s and of per f or mi ng al l oper at i ons i n connect i on wi t h t he const r uct i on of a seepage cut of f wal l , i n accor dance wi t h t hese Speci f i cat i ons and appl i cabl e Pl ans. The cut of f wal l const r uct i on met hod addr essed by t hi s Speci f i cat i on i s t he open t r ench sl ur r y soi l - bent oni t e ( SB) cut of f wal l met hod. The i nt ent of t he cut of f wal l i s t o pr ovi de a per manent , cont i nuous, homogeneous, l ow per meabi l i t y bar r i er t o embankment and f oundat i on seepage wi t hi n t he ver t i cal dept h l i mi t s and hor i zont al st at i on l i mi t s shown on t he Pl ans. The cut of f wal l shal l be f or med f r om a wor ki ng sur f ace by t he s l ur r y t r ench excavat i on met hod al ong t he cent er of t he exi st i ng l evee usi ng bent oni t e s l ur r y as t he st abi l i z i ng agent and backf i l l ed wi t h an SB mi xt ur e.

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 wi t hi n t he t ext by t he basi c desi gnat i on onl y.

AMERI CAN PETROLEUM I NSTI TUTE ( API )

API RP 13B- 1 ( 2009; Er r at a 2014) Recommended Pr act i ce f or Fi el d Test i ng Wat er - Based Dr i l l i ng Fluids

API Spec 13A ( 2010; Er r at a 1 2014; Er r at a 2- 3 2015) Speci f i cat i on f or Dr i l l i ng- Fl ui d Mat er i al s

ASTM I NTERNATI ONAL ( ASTM)

ASTM C117 ( 2017) St andar d Test Met hod f or Mat er i al s Fi ner t han 75- um ( No. 200) Si eve i n Mi ner al Aggr egat es by Washi ng

ASTM C136/ C136M ( 2014) St andar d Test Met hod f or Si eve Anal ysi s of Fi ne and Coar se Aggr egat es

ASTM C143/ C143M ( 2012) St andar d Test Met hod f or Sl ump of Hydr aul i c- Cement Concr et e

ASTM D2488 ( 2009a) Descr i pt i on and I dent i f i cat i on of Soi l s ( Vi sual - Manual Pr ocedur e)

ASTM D3740 ( 2012a) Mi ni mum Requi r ement s f or Agenci es Engaged i n t he Test i ng and/ or I nspect i on of Soi l and Rock as Used i n Engi neer i ng Desi gn and Const r uct i on

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ASTM D4380 ( 2012) St andar d Test Met hod f or Densi t y of Bent oni t i c Sl ur r i es

ASTM D5084 ( 2010) Measur ement of Hydr aul i c Conduct i v i t y of Sat ur at ed Por ous Mat er i al s Usi ng a Fl exi bl e Wal l Per meamet er

ASTM D7263 ( 2009) St andar d Test Met hods f or Labor at or y Det er mi nat i on of Densi t y ( Uni t Wei ght ) of Soi l Speci mens

U. S. ENVI RONMENTAL PROTECTI ON AGENCY ( EPA)

EPA 600/ 4- 90/ 027F ( 1993) Met hods f or Measur i ng t he Acut e Toxi c i t y of Ef f l uent s and Recei v i ng Wat er s t o Fr eshwat er and Mar i ne Or gani sms

STATE OF CALI FORNI A DEPARTMENT OF TRANSPORTATI ON ( CALTRANS)

Br i dge Desi gn Manual ( 2004) Br i dge Desi gn Speci f i cat i ons

CA MUTCD ( 2012) Cal i f or ni a Manual on Uni f or m Tr af f i c Cont r ol Devi ces

AECOM Techni cal Ser vi ces, I nc. ( AECOM)

Pr oj ect GDR ( 2019) Geot echni cal Dat a Repor t , PL84- 99 Emer gency Levee Repai r Pr oj ect , Geot echni cal Suppor t , Sut t er Count y, California

1. 3 GENERAL CONDI TI ONS

1. 3. 1 Li nes and Gr ades

The Cont r act i ng Of f i cer may at any t i me pr i or t o or dur i ng const r uct i on r equi r e a change i n t he cut of f wal l dept h as def i ned bel ow. The obj ect i ve of t he cut of f wal l i s t o r educe pot ent i al seepage t hr ough t he l evee embankment and/ or t hr ough t he l evee f oundat i on mat er i al s. The cut of f wal l may be opt i mi zed by i ncr easi ng or decr easi ng t he dept h of t he cut of f wal l .

The pot ent i al var i at i on f r om t he dept h i ndi cat ed i n t he Pl ans i s est i mat ed t o be pl us or mi nus f i ve ( 5) f eet , but t he Cont r act or ' s excavat i ng equi pment shal l be capabl e of excavat i ng a maxi mum of t en ( 10) f eet deeper t han t he dept h i ndi cat ed on t he Pl ans.

1. 3. 2 Conduct of Wor k

The Cont r act or shal l mai nt ai n and pr ot ect t he cut of f wal l i n a sat i sf act or y condi t i on at al l t i mes unt i l f i nal compl et i on and accept ance of al l wor k under t he Cont r act .

1. 3. 3 Access and Ramps

See Sect i on 01 50 00 TEMPORARY CONSTRUCTI ON FACI LI TI ES AND CONTROLS and Sect i on 31 00 00 EARTHWORK f or det ai l s and r equi r ement s f or access and ramps.

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1. 3. 4 Pr ot ect i on of Exi st i ng Faci l i t i es

Const r uct i on shal l be conduct ed i n a manner t hat avoi ds damage t o al l exi st i ng f aci l i t i es t hat ar e not desi gnat ed f or r emoval or r econst r uct i on.

1. 3. 5 Permits

The Cont r act or and subcont r act or s shal l obt ai n and pay al l necessar y f ees f or al l l ocal , s t at e, and f eder al per mi t s r equi r ed of t he Cont r act or and subcont r act or s t o accompl i sh t he Wor k.

1. 3. 6 Const r uct i on Met hod

The cut of f wal l t r ench shal l be const r uct ed usi ng a mi xt ur e of wat er and bent oni t e mi xed i n pr oper pr opor t i ons t o cr eat e bent oni t e s l ur r y t o f i l l t he t r ench and achi eve st abl e t r ench excavat i on. Then t he s l ur r y suppor t ed t r ench i s backf i l l ed wi t h a mi xt ur e of soi l , bent oni t e, and bent oni t e s l ur r y t o achi eve t he hydr aul i c conduct i v i t y pr oper t i es conf or mi ng t o t he Specifications.

1. 3. 7 Sequenci ng of t he Wor k

The Cont r act or may use mul t i pl e headi ngs t o achi eve t he r equi r ed schedul e compl et i on dat es. Mul t i pl e wor k shi f t s per day wi l l not be al l owed wi t hout t he appr oval of t he Cont r act i ng Of f i cer .

1. 3. 8 Wat er f or Const r uct i on

Det ai l s r egar di ng wat er suppl i es, and t he pumpi ng and conveyance of t he wat er , ar e pr esent ed i n Sect i on 01 50 00, TEMPORARY CONSTRUCTI ON FACI LI TI ES AND CONTROLS. Thi s wat er sour ce wi l l be used f or al l t r i al mi xes and production.

1. 4 DEFINITIONS

1. 4. 1 Cut of f Wal l

The cut of f wal l i s a mi ni mum 36- i nch- wi de t r ench const r uct ed f r om t he wor ki ng sur f ace by t he s l ur r y t r ench excavat i on met hod usi ng bent oni t e s l ur r y as t he st abi l i z i ng agent and subsequent l y backf i l l ed wi t h SB mi xt ur e t o f or m a l ow per meabi l i t y cut of f wal l wi t h speci f i ed maxi mum per meabi l i t y .

1. 4. 2 Sl ur r y Tr ench

The sl ur r y t r ench i s a 36- i nch wi de t r ench excavat ed t hr ough t he exi st i ng gr ound or pr epar ed wor ki ng sur f ace usi ng t he s l ur r y met hod of excavat i on.

1. 4. 3 Bentonite

Bent oni t e i s an ul t r af i ne nat ur al c l ay whose pr i nc i pal mi ner al const i t uent i s sodi um cat i on mont mor i l l oni t e.

1. 4. 4 Sl ur r y Met hod of Excavat i on

The sl ur r y met hod of excavat i on consi st s of excavat i ng a ver t i cal wal l ed t r ench and at t he same t i me keepi ng t he t r ench f i l l ed wi t h bent oni t e s l ur r y. The pur pose of t he s l ur r y i s t o suppor t t he wal l s of t he t r ench whi l e excavat i ng t o t he desi gn dept h unt i l r epl aced wi t h an SB mi xt ur e.

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1. 4. 5 Bent oni t e Sl ur r y

Bent oni t e s l ur r y i s a col l oi dal mi xt ur e of bent oni t e and wat er and appr oved admi xt ur es pr epar ed i n accor dance wi t h API Spec 13A meet i ng t he v i scosi t y r equi r ement s of t hi s Speci f i cat i on.

1. 4. 6 SB Backf i l l

A homogeneous mi xt ur e of mat er i al pr oduced by mi xi ng soi l , bent oni t e s l ur r y and bent oni t e ( as needed) t o meet t he appr oved desi gn mi x, whi ch i s t hen used t o backf i l l t he s l ur r y st abi l i zed t r ench.

1. 4. 7 Gr ound Wat er Level

The gr ound wat er l evel i s t he pi ezomet r i c l evel of wat er al ong t he cut of f wal l al i gnment .

1. 4. 8 Lead- i n Tr ench

A sl oped excavat i on i s used t o i ni t i at e t he const r uct i on of a cut of f wal l trench.

1. 4. 9 Wor ki ng Sur f ace

The wor ki ng sur f ace i s t he t op of t he degr aded l evee sur f ace, pr epar ed as shown on t he Pl ans and descr i bed i n t he Speci f i cat i ons f r om whi ch t he cut of f wal l shal l be const r uct ed.

1. 4. 10 Key- I n Mat er i al

The key- i n mat er i al i s t he soi l s t r at um i nt o whi ch t he bot t om of t he cut of f wal l i s embedded.

1. 4. 11 Sl ur r y Cut of f Wal l Speci al i s t

The SB sl ur r y cut of f wal l speci al i s t i s an i ndi v i dual wor ki ng f or t he Cont r act or who wi l l have r esponsi bi l i t y f or t he const r uct i on of t he SB cut of f wal l .

1. 4. 12 Sl ur r y Cut of f Wal l Excavat i on Equi pment Oper at or

The sl ur r y excavat i on equi pment oper at or i s an i ndi v i dual who wi l l oper at e t he excavat i on equi pment used t o excavat e t he SB cut of f wal l .

1. 4. 13 Tr ench Qual i t y Cont r ol Techni c i an ( TQCT)

The TQCT wor ki ng under t he di r ect i on of t he Cont r act or ' s SB sl ur r y cut of f wal l speci al i s t wi l l t ake r equi r ed measur ement s of t r ench geomet r y, per f or m t r ench sl ur r y and backf i l l sampl i ng, and per f or m t r ench soundi ngs.

1. 4. 14 Tr ench Logger

The t r ench l ogger i s an i ndi v i dual wor ki ng f or t he Cont r act or who wi l l have r esponsi bi l i t y f or l oggi ng t he descr i pt i on and cl assi f i cat i on of t he mat er i al excavat ed f r om t he s l ur r y t r ench and pr epar i ng a soi l pr of i l e of t he t r ench excavat i on.

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1. 4. 15 Qual i t y Cont r ol Engi neer

The Qual i t y Cont r ol Engi neer i s a Regi st er ed Pr of essi onal Engi neer who i s an i ndi v i dual wor ki ng f or t he Cont r act or and i s r esponsi bl e f or ver i f y i ng Cont r act or ' s Qual i t y Cont r ol Pr ogr am i s bei ng pr oper l y i mpl ement ed and t he speci f i ed cut of f wal l pr oper t i es ar e bei ng achi eved.

1. 4. 16 Qual i t y Cont r ol Labor at or y

Cont r act or ' s Qual i t y Cont r ol Labor at or y shal l per f or m qual i t y cont r ol t est i ng on mat er i al sampl es t o ver i f y compl i ance wi t h t he Speci f i cat i ons.

1. 4. 17 Qual i t y Cont r ol Repor t

A r epor t pr epar ed by t he Cont r act or f or each shi f t and f or each r i g ( i f mul t i pl e headi ngs of t he cut of f wal l ar e advanced) t hat document s t he pr ogr ess on t he SB cut of f wal l const r uct i on and pr esent t he r esul t s of t he qual i t y cont r ol i nspect i on and t est i ng.

1. 4. 18 Excavat i on Ref usal

The Cont r act i ng Of f i cer wi l l det er mi ne when excavat i on r ef usal i s r eached.

Excavat i on r ef usal wi l l be def i ned as t he i nabi l i t y of t he Cont r act or ' s appr oved pr oduct i on excavat or t o excavat e mor e t han one f oot of dept h over a bot t om t r ench l engt h of 30 f eet i n a per i od of 60 mi nut es wi t h excavat or equi pment i n pr oper and ef f ect i ve oper at i ng condi t i on.

1. 4. 19 Obstructions

The Cont r act i ng Of f i cer shal l be t he sol e j udge of whet her an obst r uct i on has been encount er ed. Not e however t hat cul ver t s, st andpi pes, and ot her bur i ed f eat ur es ( e. g. exi st i ng cut of f wal l s, et c. ) t hat ar e shown on t he Pl ans; exi st i ng ut i l i t i es shown on t he Pl ans or mar ked by Under gr ound Ser vi ce Al er t ( USA) ; and nat ur al l y- occur r i ng mat er i al s such as cobbl es and boul der s shal l not be consi der ed obst r uct i ons.

1. 4. 20 Remedi at i on Pl an

A pl an t hat descr i bes t he st eps t o be t aken by t he Cont r act or t o br i ng any sect i on of wal l back i nt o compl i ance wi t h t he speci f i cat i ons.

1. 4. 21 El evat i on Dat um

Al l el evat i ons ar e r ef er enced t o t he Nor t h Amer i can Ver t i cal Dat um of 1988 ( NAVD- 88) i n f eet .

1. 4. 22 Mat er i al Saf et y Dat a Sheet ( MSDS)

A det ai l ed i nf or mat i onal document pr epar ed by t he manuf act ur er or i mpor t er of a hazar dous chemi cal t hat descr i bes t he physi cal and chemi cal pr oper t i es of t he pr oduct .

1. 5 SUBMITTALS

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

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Al l Pr econst r uct i on Submi t t al s, except t he Pr econst r uct i on SB Tr i al Mi x Desi gn Pl an and Pr econst r uct i on SB Tr i al Mi x Desi gn Repor t , shal l be submi t t ed no l at er t han 30 cal endar days af t er Not i ce- t o- Pr oceed. The Pr econst r uct i on SB Tr i al Mi x Desi gn Pl an shal l be submi t t ed no l at er t han 7 cal endar days af t er Not i ce- t o- Pr oceed and t he Pr econst r uct i on SB Tr i al Mi x Desi gn Repor t shal l be submi t t ed no l at er t han 75 days af t er Notice-to-Proceed.

SB Cut of f Wal l I mpl ement at i on Pl an; G, DO

Pr econst r uct i on SB Tr i al Mi x Desi gn Pl an; G, DO

Pr econst r uct i on SB Tr i al Mi x Desi gn Repor t ; G, DO

SB Cut of f Wal l Qual i t y Cont r ol Pr ogr am; G, DO

Wat er Qual i t y Test Resul t s; G, DO

Cont r act or Qual i f i cat i ons; G, DO

Qual i t y Cont r ol Labor at or y Qual i f i cat i ons; G, DO

Remedi at i on Pl an; G, DO

SD- 04 Sampl es

Bentonite;

Cut of f Wal l

SD- 06 Test Repor t s

Dai l y Qual i t y Cont r ol Repor t ; G, DO

Weekl y Qual i t y Cont r ol Repor t ; G, DO

Labor at or y Test i ng Repor t ; G, DO

Const r uct i on Qual i t y Cont r ol Test Resul t s ; G, DO

SD- 07 Cer t i f i cat es

Bent oni t e Powder Manuf act ur er Test Resul t s; G, RO

Cal i br at i on of Scal es and Fl ow Met er s; G, RO

SD- 11 Cl oseout Submi t t al s

Const r uct i on Recor ds; G, DO

Const r uct i on Document at i on; G, DO

Const r uct i on Log; G, DO

As- bui l t Dr awi ng; G, DO

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1. 6 QUALIFICATIONS

1. 6. 1 Cont r act or Qual i f i cat i ons

The Cont r act or , j oi nt vent ur e par t ner , or mer ged company shal l have successf ul l y const r uct ed a mi ni mum of one SB cut of f wal l pr oj ect i n t he l ast 5 year s of s i mi l ar s i ze and compl exi t y as t hi s pr oj ect wi t h s i mi l ar access const r ai nt s, and s i mi l ar dept h and l engt h. Consi der mul t i pl e cut of f wal l segment s under one cont r act t o be one pr oj ect . The qual i f i cat i ons and exper i ence of per sonnel who shal l be r esponsi bl e f or conduct i ng t he oper at i ons shal l i ncl ude r ef er ences of t he pr evi ousl y compl et ed pr oj ect owner s wi t h owner name; t el ephone number ; addr ess; and pr oj ect descr i pt i on i ncl udi ng dept h, l engt h, and const r uct i on met hod of t he Cont r act or ' s pr evi ous successf ul SB cut of f wal l const r uct i on pr oj ect s. An i ndi v i dual ' s exper i ence f r om f or mer compani es shal l not qual i f y as t he pr esent company' s exper i ence. However t hi s exper i ence can be used as i ndi v i dual exper i ence such as f or t he s l ur r y cut of f wal l speci al i s t . Submi t Cont r act or Qual i f i cat i ons f or appr oval . An individual's experience from former companies shall qualify as experience provided the individuals are performing the same role as previously performed on a successful SB cutoff wall project. Submit Contractor Qualifications including valid references for approval.

1. 6. 2 Qual i f i cat i ons of Sl ur r y Cut of f Wal l Speci al i s t and Sl ur r y Cut of f Wal l Excavat i on Equi pment Oper at or s

The Cont r act or shal l mai nt ai n a s l ur r y cut of f wal l speci al i s t and equi pment oper at or at t he s i t e on a f ul l - t i me basi s whi l e t he cut of f wal l i s bei ng const r uct ed. The pr i mar y or al t er nat e empl oyee shal l be commi t t ed t o t he Cont r act or f or t he dur at i on of t he pr oj ect , unl ess a wr i t t en r el ease i s obt ai ned f r om t he Cont r act i ng Of f i cer ' s Repr esent at i ve.

Pr ovi de s l ur r y cut of f wal l speci al i s t qual i f i cat i ons as par t of t he Cont r act or Qual i f i cat i ons submi t t al f or appr oval . Qual i f i cat i ons must meet t he r equi r ement s of par agr aph SLURRY CUTOFF WALL SPECI ALI ST.

Pr ovi de s l ur r y cut of f wal l excavat i on equi pment oper at or qual i f i cat i ons as par t of t he Cont r act or Qual i f i cat i ons submi t t al f or appr oval .

Qual i f i cat i ons must meet t he r equi r ement s of par agr aph SLURRY CUTOFF WALL EXCAVATI ON EQUI PMENT OPERATOR. I f t he Cont r act or ut i l i zes mul t i pl e headi ngs, t he Cont r act or shal l submi t qual i f i cat i ons f or s l ur r y cut of f wal l excavat i on equi pment oper at or s f or each headi ng.

The f ol l owi ng i nf or mat i on shal l be submi t t ed t o t he Gover nment f or bot h t he s l ur r y cut of f wal l speci al i s t and s l ur r y cut of f wal l excavat i on equi pment operators:

a. Name, addr ess, and t el ephone number of owner / company and poi nt of cont act f or pr oj ect s f or mi ng t he exper i ence r ecor d.

b. Cont r act number , cont r act amount , dat e of awar d, and dat e of compl et i on of t he pr oj ect f or mi ng t he exper i ence.

c. SB cut of f wal l l engt h and dept h.

d. A copy of t he por t i on of t he speci f i cat i on r equi r ement f r om t he r ef er ence pr oj ect i ndi cat i ng t he r equi r ed wal l accept ance cr i t er i a ( e. g. , per meabi l i t y) or a l et t er of r ef er ence f r om t he owner f or each pr oj ect submi t t ed t he br i ef l y descr i bes t he speci f i cat i on r equi r ement s.

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e. Descr i pt i on of t he met hod of const r uct i on and excavat i on equi pment used.

1. 6. 2. 1 Sl ur r y Cut of f Wal l Speci al i s t

The sl ur r y cut of f wal l speci al i s t shal l be onsi t e at al l t i mes dur i ng t he t r enchi ng and sl ur r y pl acement oper at i ons and pr ovi des super vi s i on and cont r ol of t he composi t i on, mi x i ng, pl aci ng, and mai nt enance of t he SB slurry.

The sl ur r y cut of f wal l speci al i s t shal l be an i ndi v i dual who has had exper i ence wi t h at l east 2 pr oj ect s and 5 year s of exper i ence i n al l aspect s of s l ur r y cut of f wal l const r uct i on whi ch i ncl udes, but i s not l i mi t ed t o:

a. Cont r ol l i ng composi t i on, mi x i ng, pl aci ng, t est i ng, and mai nt ai ni ng t he bent oni t e s l ur r y.

b. Super vi s i on of al i gnment , ver t i cal i t y , and dept h of cut of f wal l s.

c. Tr ench excavat i on, bent oni t e s l ur r y t r ench f i l l i ng, and SB backf i l l i ng procedures.

d. The mi xi ng met hods r equi r ed t o pr oper l y cont r ol composi t i on, mi x i ng, t est i ng, and pl acement of SB backf i l l as r equi r ed.

e. A t hor ough knowl edge of cut of f wal l const r uct i on equi pment and mat er i al t est i ng r equi r ed f or s l ur r y cut of f wal l const r uct i on.

f . Show successf ul const r uct i on of at l east t wo SB cut of f wal l s havi ng s i mi l ar access const r ai nt s and at a mi ni mum as deep. Pr oj ect exper i ence not i n Nor t h Amer i ca may be c i t ed, however subj ect t o appr oval based on ver i f i cat i on.

1. 6. 2. 2 Sl ur r y Cut of f Wal l Excavat i on Equi pment Oper at or

Each sl ur r y cut of f wal l excavat i on equi pment oper at or shal l have a mi ni mum of 5 year s of pr evi ous successf ul exper i ence usi ng s i mi l ar cut of f wal l excavat i on equi pment t o be used f or t hi s Cont r act and shal l have per f or med a mi ni mum of t wo successf ul l y compl et ed pr oj ect s of s i mi l ar compl exi t y wi t h s i mi l ar or gr eat er l engt h and dept h.

1. 6. 3 TQCT

The TQCT shal l have a mi ni mum of 2 year s exper i ence wi t h cut of f wal l const r uct i on and t he t aki ng of r equi r ed measur ement s of t r ench geomet r y, per f or mi ng t r ench sl ur r y sampl i ng, and per f or mi ng t r ench soundi ngs.

1. 6. 4 Tr ench Logger

The t r ench l ogger shal l have exper i ence i n t he descr i pt i on and cl assi f i cat i on of t he excavat ed mat er i al , have a mi ni mum of 2 successf ul l y compl et ed pr oj ect s, and have a mi ni mum of 5 year s exper i ence usi ng ASTM D2488. The t r ench l ogger shal l be wor ki ng under t he r esponsi bl e char ge of a geol ogi st , c i v i l engi neer pr act i c i ng i n geot echni cal engi neer i ng, or geot echni cal engi neer r egi st er ed i n t he St at e of Cal i f or ni a. Submi t t he t r ench l ogger qual i f i cat i ons as par t of t he Cont r act or Qual i f i cat i ons.

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1. 6. 5 Qual i t y Cont r ol Engi neer

The Qual i t y Cont r ol Engi neer shal l have a P. E. r egi st r at i on and a mi ni mum of 5 year s of const r uct i on exper i ence i ncl udi ng: cut of f wal l const r uct i on;

a mi ni mum of t wo SB cut of f wal l pr oj ect s; and exper i ence wor ki ng as a Cut of f Wal l Qual i t y Cont r ol Engi neer on pr oj ect s of s i mi l ar scope, pr oj ect t ype, physi cal s i ze and compl exi t y. The Qual i t y Cont r ol Engi neer shal l pr ovi de super vi s i on and cont r ol of al l qual i t y cont r ol aspect s r el at ed t o t he SB cut of f wal l . Submi t t he Qual i t y Cont r ol Engi neer qual i f i cat i ons as par t of t he Cont r act or Qual i f i cat i ons submi t t al . The Cont r act or shal l mai nt ai n a Qual i t y Cont r ol Engi neer at t he s i t e on a f ul l - t i me basi s whi l e t he cut of f wal l i s bei ng const r uct ed. The pr i mar y or al t er nat e empl oyee shal l be commi t t ed by t he Cont r act or f or t he dur at i on of t he pr oj ect , unl ess a wr i t t en r el ease i s obt ai ned f r om t he Cont r act i ng Of f i cer ' s Representative.

1. 6. 6 Qual i t y Cont r ol Labor at or y

The Cont r act or ' s qual i t y cont r ol l abor at or y shal l be an i ndependent commer ci al l abor at or y and shal l compl y wi t h t he r equi r ement s of Sect i on 01 45 00 QUALI TY CONTROL and be a USACE accr edi t ed l abor at or y. Submi t Qual i t y Cont r ol Labor at or y Qual i f i cat i ons f or appr oval .

1. 7 DELI VERY, STORAGE, AND HANDLI NG

Pr ot ect mat er i al s del i ver ed and pl aced i n st or age f r om weat her , soi l , dust , or ot her cont ami nant s.

1. 8 GEOTECHNI CAL SI TE CONDI TI ONS

1. 8. 1 Exploration

Subsur f ace expl or at or y bor i ngs and cone penet r omet er t est have been per f or med by t he Gover nment t o eval uat e t he subsur f ace condi t i ons.

Appr oxi mat e l ocat i ons of t he expl or at i ons, bor i ng l ogs, and CPT l ogs ar e i ncl uded i n t he Pr oj ect GDR at t ached t o t hese Speci f i cat i ons. The Gover nment assumes no r esponsi bi l i t y f or i nt er pr et at i ons made by t he Cont r act or f r om t he expl or at i ons. Local var i at i ons i n t he subsur f ace mat er i al s ar e t o be expect ed and, i f encount er ed, wi l l not be consi der ed as bei ng mat er i al l y di f f er ent wi t hi n t he pur vi ew of t hi s Cont r act .

1. 8. 2 Subsur f ace Condi t i ons

The l evee embankment and subsur f ace mat er i al s encount er ed dur i ng expl or at i ons ar e descr i bed i n t he Pr oj ect GDR.

1. 8. 3 Gr ound Wat er

A descr i pt i on of gr ound wat er condi t i on i n t he pr oj ect ar ea i s pr esent ed i n the Pr oj ect GDR.

1. 8. 4 Knowl edge of Subsur f ace Dat a

I t i s t he Cont r act or ' s r esponsi bi l i t y t o become acquai nt ed wi t h and sat i sf i ed as t o t he char act er , qual i t y , and quant i t y of sur f ace and subsur f ace mat er i al s by i nspect i ng t he s i t e, per f or mi ng addi t i onal expl or at i ons as necessar y f or soi l c l assi f i cat i on and mi x desi gn f or mul at i on and by eval uat i ng i nf or mat i on der i ved f r om t he expl or at i on wor k per f or med f or t hi s Pr oj ect and i ncl uded i n t hese Pl ans and Speci f i cat i ons.

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Any f ai l ur e by t he Cont r act or t o become acquai nt ed wi t h al l t he avai l abl e i nf or mat i on and any ot her s i t e speci f i c condi t i ons such as ut i l i t i es wi l l not r el i eve t he Cont r act or f r om r esponsi bi l i t y f or pr oper l y est i mat i ng t he di f f i cul t y or cost of successf ul l y per f or mi ng t he wor k.

PART 2 PRODUCTS

2. 1 GENERAL

The Cont r act or shal l mai nt ai n at t he j ob s i t e a suf f i c i ent quant i t y of r aw mat er i al s and ot her suppl i es such t hat t he wor k can pr oceed uni nt er r upt ed by mat er i al shor t ages. The bent oni t e s l ur r y and SB backf i l l t o be used shal l be sui t abl e f or t he Pr oj ect . The Cont r act or shal l , i f necessar y, modi f y t he SB backf i l l desi gn mi xes t o meet t he r equi r ement s f or per meabi l i t y , cont i nui t y, and homogenei t y speci f i ed i n t hi s Speci f i cat i on sect i on. The Cont r act or shal l under t ake any addi t i onal t est s necessar y t o assi st i n mat er i al sel ect i on, t o ver i f y compl i ance wi t h t he Speci f i cat i ons, and t o demonst r at e t he char act er i st i cs of t he cut of f wal l .

2. 2 BENTONITE

Bent oni t e shal l be sodi um cat i on base mont mor i l l oni t e powder t hat conf or ms to API Spec 13A, Sect i on 9. Bent oni t e shal l be new, pul ver i zed, hi gh- swel l i ng nat ur al sodi um cat i on mont mor i l l oni t e ( Pr emi um Gr ade Wyomi ng- t ype bent oni t e or equi val ent ) . Chemi cal l y t r eat ed bent oni t e wi l l not be al l owed. No bent oni t e f r om t he bent oni t e manuf act ur er shal l be used pr i or t o accept ance by t he Cont r act i ng Of f i cer . Al l bent oni t e shal l be subj ect t o i nspect i on, sampl i ng, and ver i f i cat i on of qual i t y by Cont r act or qual i t y cont r ol ( QC) t est i ng and Gover nment qual i t y assur ance ( QA) t est i ng. Bent oni t e not meet i ng Speci f i cat i ons shal l be pr ompt l y r emoved f r om t he s i t e and r epl aced wi t h bent oni t e conf or mi ng t o speci f i cat i on r equi r ement s at t he Cont r act or s expense. Bent oni t e shal l be pr ot ect ed f r om moi st ur e l oss dur i ng t r ansi t and st or age.

Pr ovi de a sampl e of t he bent oni t e mat er i al used wi t hi n t he mi x upon r equest f r om t he Cont r act i ng Of f i cer ' s r epr esent at i ve. The sampl e shal l consi st of a mi ni mum of 10 pounds of t he pr oposed bent oni t e at l east 5 days pr i or t o use wi t h cer t i f i cat i on t hat i t meet s API Spec 13A.

Submi t a copy of t he Bent oni t e Powder Manuf act ur er Test Resul t s f or each l ot shi pped t o t he s i t e and a cer t i f i cat e of compl i ance st at i ng t hat t he bent oni t e compl i es wi t h al l appl i cabl e st andar ds.

2. 3 WATER

2. 3. 1 Source

Ref er t o Sect i on 01 50 00, TEMPORARY CONSTRUCTI ON FACI LI TI ES AND CONTROLS f or i nf or mat i on on pot ent i al wat er suppl i es and t he r equi r ement s t hat appl y t o pr ovi di ng t he wat er suppl y f or const r uct i on of t he Pr oj ect . Pr ovi de t he wat er sour ces used f or pr oduct i on and associ at ed pH, har dness, t ot al di ssol ved sol i ds anal ysi s ( wat er sour ces used f or pr oduct i on shal l be same as t r i al mi x) . Ci t y hydr ant s i f used by Cont r act or shal l be i dent i f i ed i n t he i mpl ement at i on pl an: ( 1) not e t he l ocat i ons of hydr ant s f or use, and ( 2) pr ocur e appr opr i at e per mi t s. The Cont r act or shal l abi de by any and al l r egul at i ons and ot her r equi r ement s gover ni ng such use. The Cont r act or shal l i ncl ude t he cost of al l r el at ed f ees i n t he bi d i t ems per t i nent t o t he Wor k.

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2. 3. 2 Wat er Qual i t y

The wat er shal l compl y wi t h t he st andar ds speci f i ed bel ow. The Cont r act or shal l f ur ni sh Wat er Qual i t y Test Resul t s f or wat er used f or mi xi ng wi t h t he s l ur r y t o assur e conf or mance wi t h t hese st andar ds.

Property Pr oper t y Requi r ement Test Met hod pH Val ue 7. 0 +/ - 1. 0 API RP 13B- 1

Tot al Di ssol ved Sol i ds <500 ppm EPA 600/ 4- 90/ 027F

Oi l , or gani cs, aci ds, or ot her del et er i ous

<50 ppm each API RP 13B- 1

Hardness <50 ppm API RP 13B- 1

Wat er wi t h har dness i n excess of 50 ppm wi l l be accept abl e t o t he Gover nment f or use t o const r uct t he SB cut of f wal l s based on per f or mance i n t he t r i al and backf i l l mi x as l ong as t he r equi r ed per meabi l i t y st andar ds speci f i ed her ei n f or t he backf i l l mi x ar e achi eved t hr oughout t he pr oj ect .

2. 4 BACKFI LL MI X DESI GN

Backf i l l mi x desi gn t o pr epar e SB backf i l l meet i ng t he r equi r ement s of t hi s Speci f i cat i on shal l be t he r esponsi bi l i t y of t he Cont r act or and shal l t ake i nt o account t he subsur f ace condi t i ons al ong t he pr oj ect al i gnment . A s i t e speci f i c mi x desi gn i s r equi r ed; submi t t al of mi x desi gns f r om pr evi ous pr oj ect s i s not per mi t t ed. The Cont r act or shal l pr epar e and submi t a Pr econst r uct i on SB Tr i al Mi x Desi gn Pl an. The pl an shal l summar i ze t he pr ocedur es of t he pr econst r uct i on SB backf i l l t r i al mi x desi gn. The pl an shal l i ncl ude a descr i pt i on of pr oposed mat er i al s, mi x pr opor t i ons ( bent oni t e, soi l , and wat er ) , and l abor at or y t est pr ocedur es. The Pr econst r uct i on SB Tr i al Mi x Desi gn Pl an shal l be appr oved by t he Cont r act i ng Of f i cer pr i or begi nni ng SB t r i al mi x desi gns and associ at ed testing.

Tr i al mi xes shal l be made usi ng soi l sampl es pr ovi ded by t he Gover nment , whi ch wer e obt ai ned dur i ng t he desi gn phase i nvest i gat i ons.

The Cont r act or shal l per f or m a ser i es of t r i al backf i l l mi x desi gns based on t he appr oved Pr econst r uct i on SB Tr i al Mi x Desi gn Pl an t o eval uat e a r ange of bent oni t e mi x pr opor t i ons. The Cont r act or shal l pr epar e a suf f i c i ent number of sampl es t o suppor t t he Cont r act or ' s pr oposed mi x desi gn. The mi ni mum number of t r i al backf i l l mi x desi gns shal l be t hr ee cover i ng a r ange of bent oni t e mi x const i t uent . Al l mi xes shal l be a mi ni mum of 3 per cent bent oni t e of t he t ot al mi x wei ght .

The t est i ng f or t he t r i al backf i l l mi x shal l i ncl ude but be not l i mi t ed t o bl eed, t emper at ur e, densi t y, and hydr aul i c conduct i v i t y of sampl es at ages of 7, 14, and 28- day. Hydr aul i c conduct i v i t y t est i ng shal l be per f or med f ol l owi ng t he r equi r ement of Sect i on 3. 8. 10. 5.

The desi gn mi x f or t he s l ur r y cut of f wal l SB backf i l l shal l be sel ect ed by t he Cont r act or and appr oved by t he Cont r act i ng Of f i cer based upon t he appr oved Pr econst r uct i on SB Tr i al Mi x Desi gn Repor t . The r epor t shal l summar i ze t he pr ocedur es and r esul t s of pr econst r uct i on SB sl ur r y t r i al mi x

SECTI ON 31 56 14 Page 14 desi gns al ong wi t h t he Cont r act or ' s sel ect ed mi x desi gn f or t he SB sl ur r y backf i l l . Modi f i cat i ons t o t he i ni t i al desi gn mi x shal l be made onl y wi t h t he appr oval of t he Cont r act i ng Of f i cer .

See subpar t par agr aph SOI L- BENTONI TE TRENCH BACKFI LL f or hydr aul i c conduct i v i t y t est r equi r ement s f or SB backf i l l . Onl y mi xes meet i ng or exceedi ng t he t est r equi r ement s shal l be appr oved f or use.

2. 5 PROPERTI ES OF BENTONI TE SLURRY I N MI XI NG AREA

Test i ng of bent oni t e wat er s l ur r y pr oper t i es shal l be i n accor dance wi t h API RP 13B- 1. Bef or e ut i l i z i ng, t he bent oni t e s l ur r y i n t he mi xi ng ar ea t he s l ur r y shal l be r equi r ed t o be hydr at ed and have t he f ol l owi ng pr oper t i es.

Property Pr oper t y Requi r ement Test Met hod

Viscosity > 40 mar sh- seconds API RP 13B- 1

Density > 64 pcf ASTM D4380

Fi l t r at e Loss < 20 cubi c cm API RP 13B- 1 pH 6. 5 t o 10 API RP 13B- 1

2. 6 PROPERTI ES OF BENTONI TE SLURRY I N TRENCH

The bent oni t e s l ur r y i n t he t r ench shal l have t he f ol l owi ng pr oper t i es.

Test i ng of s l ur r y pr oper t i es shal l be i n accor dance wi t h API RP 13B- 1.

Property Pr oper t y Requi r ement Test Met hod

Density > 64 pcf and < 85 pcf ASTM D4380 pH 6. 5 t o 10 API RP 13B- 1

Fi l t r at e Loss < 30 cubi c cm API RP 13B- 1

Viscosity > 40 mar sh- seconds API RP 13B- 1

2. 7 SB BACKFI LL

2. 7. 1 Soi l f or Backf i l l

Gr adat i on f or t he soi l used as backf i l l shal l meet t he f ol l owi ng requirements:

Si eve Si ze or Number Per cent ( %) Passi ng by Dr y Wei ght

2-inch 100

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Si eve Si ze or Number Per cent ( %) Passi ng by Dr y Wei ght

No. 4 > 40

No. 200 > 20

I n addi t i on, t he soi l shal l be f r ee of r oot s, debr i s, concent r at i ons of or gani c mat er i al s, and al l ot her del et er i ous mat er i al t hat may adver sel y af f ect t he pr oper t i es of t he backf i l l . Sour ces f or soi l f or use i n t he SB mi x shal l i ncl ude:

a. Sui t abl e soi l sel ect ed f r om t he s l ur r y t r ench excavat i on spoi l s t hat conf or ms t o t he Speci f i cat i ons.

b. Soi l s sel ect ed f r om mandat or y pr oj ect excavat i ons. These soi l s shal l be bl ended by t he Cont r act or , t o pr oduce sui t abl e mat er i al t hat conf or ms t o t he Speci f i cat i ons.

The Cont r act or shal l make ever y ef f or t t o maxi mi ze t he r euse of on- si t e soi l s f r om mandat or y excavat i ons. Thi s i ncl udes bl endi ng di f f er ent excavat ed soi l s t o pr oduce mat er i al f or t he SB mi x t hat meet s t he Speci f i cat i on r equi r ement s. I f sui t abl e SB mi x soi l s cannot be obt ai ned or manuf act ur ed f r om mandat or y excavat i ons, sui t abl e soi l s shal l t hen be i mpor t ed f r om of f - s i t e bor r ow si t e( s) as backf i l l or f or bl endi ng wi t h on- si t e excavat ed soi l s t o make a sui t abl e soi l backf i l l t hat conf or ms t o t he Speci f i cat i ons.

2. 7. 2 SB Backf i l l

SB mi xt ur e shal l compl y wi t h t he Gover nment appr oved mi x desi gn. Bent oni t e s l ur r y and dr y bent oni t e ( as needed) shal l be added and mi xed wi t h t he soi l backf i l l so t he SB backf i l l has t he f ol l owi ng pr oper t i es:

a. Uni f or mi t y: The SB backf i l l shal l be t hor oughl y mi xed pr i or t o pl acement i n t he cut of f wal l t r ench such t hat t he bent oni t e i s uni f or ml y mi xed t hr ough t he soi l backf i l l and t he mi xt ur e i s homogeneous wi t h no unmi xed soi l c l ods l ar ger t han 2 i nches i n size.

b. Maxi mum Par t i c l e- Si ze: The soi l - bent oni t e backf i l l shal l not cont ai n unmi xed soi l c l ods or r ock l ar ger t han 2 i nches i n s i ze.

c. Sl ump: The soi l - bent oni t e backf i l l shal l have a pl acement consi st ency cor r espondi ng t o a s l ump cone val ue of 5 i nches t o 7 i nches det er mi ned i n gener al accor dance wi t h ASTM C143/ C143M.

d. Densi t y: Backf i l l must have a pl acement sat ur at ed uni t wei ght at l east 15 pounds per cubi c f oot gr eat er t han t he densi t y of t he bent oni t e s l ur r y i n t he t r ench based on t he maxi mum i n- pl ace t r ench sl ur r y densi t y measur ement ( ASTM D7263).

e. Hydr aul i c Conduct i v i t y: The SB backf i l l shal l have a 10- t est r unni ng aver age no gr eat er t han 5x10- 7 cent i met er s per second ( cm/ sec) when measur ed at 28 days and t est ed i n accor dance wi t h ASTM D5084 Met hod C. No t est shal l be gr eat er t han 1x10- 6 cm/ sec.

Any t est l ower t han 1x10- 7 cm/ sec wi l l be capped at 1x10- 7 cm/ sec f or r unni ng aver age cal cul at i ons.

SECTI ON 31 56 14 Page 16

The appr oved desi gn SB mi x shal l be adj ust ed by t he Cont r act or , i f appr oved by t he Cont r act i ng Of f i cer ' s Repr esent at i ve, t o adapt t o changes i n f i el d condi t i ons at no addi t i onal cost t o t he Gover nment .

2. 8 MATERI AL STORAGE FACI LI TY

The Cont r act or shal l pr ovi de al l necessar y mat er i al s, equi pment , and per sonnel t o st or e bent oni t e and ot her addi t i ves t o pr event moi st ur e or ot her cont ami nant s f r om mi xi ng wi t h t he mat er i al s pr i or t o use.

2. 9 ENVI RONMENTAL PROTECTI ON

The r aw mat er i al s and ot her suppl i es used i n t he const r uct i on of t he SB cut of f wal l and any spoi l s di sposed of shal l be non- hazar dous and shal l compl y wi t h t he SECTI ON 01 57 19 ENVI RONMENTAL PROTECTI ON t o pr event , and pr ovi de f or abat ement and cont r ol of , any envi r onment al pol l ut i on ar i s i ng as a par t of t he wor k.

2. 10 DI SPOSAL SI TE

Cut of f wal l t r ench excavat ed mat er i al and/ or excess bent oni t e s l ur r y t hat ar e not sui t abl e f or use per Sect i on 31 00 00 EARTHWORK shal l be di sposed of of f - s i t e at t he Cont r act or ' s expense.

2. 11 TRENCH PLATES

St eel t r ench pl at es used t o pr ovi de const r uct i on cr ossi ng of t he 36- i nch cut of f wal l t r ench shal l be desi gned f or HS20- 44 t r uck l oadi ng per Cal t r ans Br i dge Desi gn Manual . The Cont r act or shal l mai nt ai n on t he st eel pl at es a non- ski d sur f ace havi ng a mi ni mum coef f i c i ent of f r i c t i on of 0. 35 as det er mi ned by Cal i f or ni a Test Met hod 342. The t r ench pl at es shal l ext end a suf f i c i ent di st ance beyond t he edge of t he t r ench wal l s so t hat l oad t r ansf er f r om t he pl at es does not i mpact t r ench st abi l i t y dur i ng cur i ng and st r engt h devel opment of t he wal l .

2. 12 EQUIPMENT

The Cont r act or shal l submi t a SB Cut of f Wal l I mpl ement at i on Pl an t hat shal l i dent i f y al l necessar y pl ant and equi pment f or use on t hi s Pr oj ect . The Cont r act or shal l obt ai n and mai nt ai n at t he j obsi t e a suppl y of spar e cr i t i cal r epl acement par t s or backup equi pment suf f i c i ent t o al l ow t he cut of f wal l const r uct i on t o pr oceed wi t h mi ni mum l oss of t i me due t o mechani cal br eakdown or equi pment f ai l ur e. Cal i br at i on of Scal es and Fl ow Met er s shal l be pr ovi ded by t he Cont r act or .

2. 12. 1 Tr ench Excavat i on Equi pment

Equi pment f or excavat i ng t he s l ur r y t r ench shal l be any t ype or combi nat i on of excavat i ng equi pment capabl e of per f or mi ng t he Wor k as speci f i ed and shown on t he Pl ans. The equi pment shal l be one t hat r educes l i ve- l oad sur char ge t o a l evel t hat wi l l mai nt ai n st abi l i t y of t he t r ench. The equi pment shal l be capabl e of excavat i ng t he r equi r ed mi ni mum wi dt h of t r ench i n a s i ngl e pass of t he excavat i ng equi pment . The bucket s ut i l i zed wi t h such equi pment may be per f or at ed, t aper ed, and equi pped wi t h bot t om- si de cut t er t eet h pr ot r udi ng no mor e t han 6 i nches. The excavat or bucket t eet h shal l be r epl aceabl e wi t h r ock excavat i ng t eet h and capabl e of bei ng f i t t ed wi t h a r i pper t oot h. The bucket shal l be desi gned t o mai nt ai n t he wi dt h of t he t r ench and t o mi ni mi ze r avel i ng of t he t r ench si des dur i ng

SECTI ON 31 56 14 Page 17 use. The equi pment shal l be abl e t o excavat e a maxi mum of 10 f eet deeper t han t he dept h shown on t he Pl ans.

I n addi t i on t o t he excavat i ng equi pment , t he Cont r act or shal l have avai l abl e on t he j ob s i t e a choppi ng bi t , r i ppi ng bl ock, or ot her sui t abl e devi ces as r equi r ed t o accompl i sh t he t r ench excavat i on t o t he f ul l r equi r ed dept h. Al l equi pment and any equi pment modi f i cat i ons shal l be r evi ewed and cer t i f i ed by t he equi pment manuf act ur er .

I f t her e i s i nst abi l i t y due t o equi pment , t he Cont r act or shal l r epai r t he wal l at no expense t o t he Gover nment .

2. 12. 2 Bent oni t e Sl ur r y Mi xi ng Equi pment

The equi pment used f or mi xi ng t he bent oni t e s l ur r y shal l be capabl e of mi x i ng t he mat er i al s i nt o a homogeneous mi xt ur e conf or mi ng t o t he Cont r act speci f i cat i on r equi r ement s. The sl ur r y mi xi ng pl ant shal l be equi pped wi t h a hi gh- speed/ hi gh- shear , col l oi dal mi xer or a hi gh- vel oci t y/ hi gh pr essur e vent ur i j et mi xer used i n conj unct i on wi t h a hi gh- speed/ hi gh- shear cent r i f ugal pump. The pl ant shal l be equi pped wi t h a mechani cal l y or hydr aul i cal l y agi t at ed sump and shal l i ncl ude pumps, val ves, hoses, suppl y l i nes, t ool s, and ot her equi pment and mat er i al s r equi r ed t o pr epar e t he s l ur r y and del i ver i t i n a cont i nuous suppl y f r om t he hydr at i on t anks t o t he s l ur r y t r ench. Mi xer s shal l be capabl e of achi evi ng compl et e di sper si on of bent oni t e and addi t i ves, and shal l be capabl e of cont i nual l y mi xi ng t he hydr at ed SB sl ur r y t o pr ovi de and mai nt ai n a uni f or m bl ended sl ur r y. Tanks or ot her st or age f aci l i t i es f or st or age of t he pr epar ed bent oni t e s l ur r y shal l be i n accor dance wi t h t he appr oved Cont r act or ' s SB Cut of f Wal l I mpl ement at i on Pl an.

The Cont r act or i s r equi r ed t o r ecor d and r epor t t he dai l y wei ght of dr y bent oni t e and wat er used i n t he s l ur r y pr epar at i on.

2. 12. 3 Sl ur r y Desander

The Cont r act or shal l have and mai nt ai n onsi t e a Cont r act i ng Of f i cer appr oved and pr oper l y f unct i oni ng s l ur r y desander bef or e t he st ar t of , and dur i ng cut of f wal l const r uct i on.

2. 12. 4 Fi el d Labor at or y Equi pment

The f i el d l abor at or y equi pment f or Cont r act or ' s qual i t y cont r ol t est i ng shal l be made avai l abl e f or Gover nment t est i ng at any t i me and shal l cont ai n, at a mi ni mum, t he f ol l owi ng equi pment :

1. Two Mar sh f unnel set s.

2. One st andar d f i l t er pr ess.

3. Two mud bal ances ( di r ect r eadi ng of densi t y) .

4. One sl ur r y sampl er .

5. Two No. 200 si eves.

6. One set of s t andar d s i eves and si eve shaker .

7. One oven f or moi st ur e cont ent .

8. One scal e.

9. One pH met er .

10. Two sl ump cones.

SECTI ON 31 56 14 Page 18

2. 12. 5 Sl ur r y Tr anspor t i ng Equi pment

Equi pment used f or del i ver i ng bent oni t e s l ur r y t o t he t r ench shal l be pumps t hat ar e capabl e of del i ver i ng bent oni t e s l ur r y quant i t i es wi t hout spi l l age, del ays i n pl acement or i nduci ng di scont i nui t i es i n t he wal l . Al l non- compl yi ng mat er i al shal l be r emoved and r epl aced at t he expense of t he contractor.

2. 12. 6 Haul i ng Equi pment

Ear t hwor k- r el at ed haul i ng and backf i l l mi x i ng equi pment shal l be pneumat i c- t i r ed and t r ack- mount ed equi pment sui t abl e f or haul i ng excavat ed mat er i al and mi x i ng soi l wi t h bent oni t e s l ur r y and meet i ng t he r equi r ement s of par agr aph EQUI PMENT WEI GHT, SPEED, AND WI DTH. To ensur e t r ench st abi l i t y , t he Cont r act or shal l est abl i sh and mai nt ai n a mi ni mum set back di st ance f r om t he open t r ench si de wal l t o t he haul i ng equi pment pat h.

2. 12. 7 Equi pment Wei ght , Speed, and Wi dt h

Wei ght of equi pment t o be used on t he l evee cr own shal l be l i mi t ed t o a maxi mum gr oss l oaded axl e wei ght of 34, 000 pounds f or t r ucks. For t r acked vehi c l es, t he maxi mum gr ound pr essur e al l owed i s 2, 500 pounds per squar e f oot . The maxi mum wei ght of t he l ong- st i ck excavat or shal l not exceed 300, 000 pounds wi t hout pr i or appr oval of t he Cont r act i ng Of f i cer and af t er eval uat i on by t he Cont r act or of t he ef f ect on l evee st abi l i t y by use of st abi l i t y anal yses. The maxi mum oper at i ng speed of al l equi pment used on t he l evee cr own or l evee t oe r oads shal l be 15 mph. The maxi mum over al l wi dt h of equi pment used on t he l evee shal l be 18 f eet .

2. 13 CONSTRUCTI ON STAKI NG

The Cont r act or shal l pr ovi de, i nst al l , and mai nt ai n al l l ayout and necessar y const r uct i on st aki ng t o l ocat e t he cut of f wal l cent er l i ne wi t hi n t he al i gnment of t he cut of f wal l and t he cut of f wal l l engt h as shown on t he Pl ans. Sur veyor ' s caps, appr opr i at el y i dent i f i ed t o i ncl ude sur vey cont r ol number and name of sur vey company and mount ed on a 2- i nch di amet er , 2- f oot - l ong st eel pi pe, dr i ven i nt o t he gr ound, shal l be pr ovi ded at each end of t he cut of f wal l . Wooden st akes shal l be pl aced al ong t he cut of f wal l cent er l i ne at 100- f oot maxi mum i nt er val s bet ween t he ends.