A.07.24_AMD_0002_Specs.pdf

Semmes Lake Dam Reconst r uct i on W912HP18R2002 Ft . Jackson, SC

SECTI ON TABLE OF CONTENTS

DI VI SI ON 01 - GENERAL REQUI REMENTS

SECTI ON 01 11 00

SUMMARY OF WORK

08/15

PART 1 GENERAL

1. 1 SUBMI TTALS

1. 2 WORK COVERED BY CONTRACT DOCUMENTS

1. 2. 1 Pr oj ect Descr i pt i on

1. 2. 2 Locat i on

1. 2. 3 Hi st or y

1. 2. 4 Or der of Wor k

1. 3 Gover nment Occupancy

1. 4 EXI STI NG WORK

1. 5 LOCATI ON OF UNDERGROUND UTI LI TI ES

1. 5. 1 Not i f i cat i on Pr i or t o Excavat i on

PART 2 PRODUCTS

PART 3 EXECUTI ON

3. 1 I NI TI AL RESERVOI R FI LLI NG

3. 1. 1 I mpl ement at i on

3. 1. 2 Reser voi r Fi l l i ng

3. 1. 3 Pr ef er r ed Fi l l i ng Rat e

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SECTI ON 01 11 00 Page 1 ( Revi sed by Amendment 0002)

SECTI ON 01 11 00

SUMMARY OF WORK

08/15

PART 1 GENERAL

1. 1 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

1. 2 WORK COVERED BY CONTRACT DOCUMENTS

1. 2. 1 Pr oj ect Descr i pt i on

Semmes Lake Dam Reconst r uct i on wi l l be c l assi f i ed as an i nt er medi at e, hi gh hazar d, ear t hen dam. Reconst r uct i on consi st s of r emovi ng t he r emai ni ng embankment mat er i al and r econst r uct i ng t he embankment .

Reconst r uct i on wi l l al so i ncl ude a cont r ol l ed concr et e out l et wor ks, a 4' x 4' out l et gat e and a t hr ee- st age l abyr i nt h wei r . The dam i s appr oxi mat el y 970 f eet l ong, wi t h maxi mum hei ght of 29 f eet above t he l ake bed. The t hr ee- st age wei r wi l l be desi gned t o keep a nor mal pool at el evat i on 215. 0' ( NAVD88) , wi t h secondar y and t er t i ar y cycl es at

215. 5' and 219. 2' , r espect i vel y. Ther e i s no emer gency spi l l way, t he pr i mar y spi l l way i s desi gned t o handl e a 100, 000 year f l ood wi t h no over t oppi ng of t he dam embankment . Wi t h t he pr oposed st or age capaci t y and hei ght , t he dam i s c l assi f i ed as an i nt er medi at e s i ze dam, accor di ng t o Tabl e 5- 1 of AR 420- 1.

1. 2. 2 Location

Semmes Lake Dam i s l ocat ed on For t Jackson i n Col umbi a, Sout h Car ol i na.

The dam and r eser voi r ar e owned and oper at ed by For t Jackson. Semmes Lake Dam i s l ocat ed at t he west er n s i de of t he Ft Jackson r eser vat i on wi t h an appr oxi mat e Lat i t ude of 34. 005° N, Longi t ude 80. 942 W ( NAVD88) .

1. 2. 3 History

A. The or i gi nal Semmes Dam was compl et ed i n 1940. The ear t hen embankment dam was 970 f eet l ong wi t h a st r uct ur al hei ght of 27 f eet and t op wi dt h of 48- f eet . The t op of dam el evat i on var i ed bet ween 220. 7 f eet and 222. 0 f eet NAVD88. The dam cr est consi st ed of t he t wo- l ane paved Semmes Road and concr et e s i dewal k.

B. Semmes Lake Dam was br eached dur i ng a maj or f l oodi ng event i n Oct ober 2015. A br each measur i ng 130 f eet wi de and over 20 f eet i n hei ght was cr eat ed dr ai ni ng Semmes Lake.

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1. 2. 4 Or der of Wor k

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Unl ess ot her wi se di r ect ed by t he Cont r act i ng Of f i cer or hi s/ her desi gnat ed r epr esent at i ve t he or der of wor k shal l be as f ol l ows:

1. Const r uct al l r equi r ed Er osi on and Sedi ment cont r ol measur es;

2. Const r uct new r ei nf or ced concr et e spi l l way i nc l udi ng f oundat i on pr epar at i on and anchor i ng, f oundat i on under dr ai n syst em, r ei nf or ced concr et e l abyr i nt h wei r , spi l l way t r ai ni ng wal l s and sl ab, and st i l l i ng basi n;

3. Const r uct i on of cof f er dams and sequenci ng wor k f or st r eam diversion

4. I nst al l i ng dewat er i ng syst em;

5. Reconst r uct new ear t hf i l l dam wi t h sand chi mney dr ai n and sand bl anket dr ai n;

6. I nst al l i ng a t oe dr ai n seepage col l ect i on syst em connect ed t o t he bl anket dr ai n i ncl udi ng f i l t er sand, dr ai n gr avel , dr ai n pi pes, c l eanout s and manhol es;

7. I nst al l i ng new i nst r ument at i on i ncl udi ng new pi ezomet er s i n dr i l l hol es, a r eser voi r st af f gage on t he spi l l way wal l , and new movement monument s;

8. I ni t i al r eser voi r f i l l i ng i nc l udi ng moni t or i ng and eval uat i ng t he per f or mance of t he dam and i t s f oundat i on as t he r eser voi r i s bei ng f i l l ed. I ni t i al r eser voi r f i l l i ng may begi n af t er compl et i on of embankment const r uct i on and pr i or t o const r uct i on of r oadway. See par agr aph I ni t i al Fi l l i ng Pl an of t hi s Sect i on.

98. Const r uct i ng new t wo l ane asphal t r oadway al ong t he ent i r e l engt h of t he new ear t h embankment wi t h guar dr ai l and pr ef abr i cat ed concr et e ar ch cul ver t t hat spans t he dei schar ge channel . Const r uct new concr et e s i dewal k and f enci ng al ong t he t op of t he new embankment .

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I f t he Opt i onal Bi d I t ems ar e exer ci sed, t he Opt i onal Bi d I t ems must be const r uct ed af t er t he r econst r uct i on of t he new embankment dam. I f t he Opt i onal Bi d I t ems ar e exer ci sed, t he Opt i onal Bi d I t ems must be i ncor por at ed i nt o t he above Or der of Wor k by t he Cont r act or and appr oved by t he Cont r act i ng Of f i cer .

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1. 3 Gover nment Occupancy

A. The Gover nment wi l l occupy t he pr emi ses f ul l t i me dur i ng t he per i od of const r uct i on t o conduct nor mal oper at i ons.

B. Cooper at e wi t h t he Gover nment t o mi ni mi ze conf l i c t s, and t o f aci l i t at e Gover nment ' s oper at i ons. Text

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1. 4 Or der of Wor k

Text

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1. 4 EXI STI NG WORK

I n addi t i on t o " FAR 52. 236- 9, Pr ot ect i on of Exi st i ng Veget at i on, St r uct ur es, Equi pment , Ut i l i t i es, and I mpr ovement s" :

a. Remove or al t er exi st i ng wor k i n such a manner as t o pr event i nj ur y or damage t o any por t i ons of t he exi st i ng wor k whi ch r emai n.

b. Repai r or r epl ace por t i ons of exi st i ng wor k whi ch have been al t er ed dur i ng const r uct i on oper at i ons t o mat ch exi st i ng or adj oi ni ng wor k, as appr oved by t he Cont r act i ng Of f i cer . At t he compl et i on of oper at i ons, exi st i ng wor k must be i n a condi t i on equal t o or bet t er t han t hat whi ch exi st ed bef or e new wor k st ar t ed.

1. 5 LOCATI ON OF UNDERGROUND UTI LI TI ES

Obt ai n di ggi ng per mi t s pr i or t o st ar t of excavat i on, and compl y wi t h I nst al l at i on r equi r ement s f or l ocat i ng and mar ki ng under gr ound ut i l i t i es.

Ver i f y exi st i ng ut i l i t y l ocat i ons i ndi cat ed on cont r act dr awi ngs, wi t hi n ar ea of wor k.

Ver i f y el evat i ons bef or e i nst al l i ng new wor k c l oser t han near est manhol e or ot her st r uct ur e at whi ch an adj ust ment i n gr ade can be made.

1. 5. 1 Not i f i cat i on Pr i or t o Excavat i on

Not i f y t he Cont r act i ng Of f i cer at l east 15 days pr i or t o st ar t i ng excavat i on wor k.

PART 2 PRODUCTS

Not used.

PART 3 EXECUTI ON

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Not used.

3. 1 I NI TI AL RESERVOI R FI LLI NG

3. 1. 1 Implementation

When t he r eser voi r f i l l i ng begi ns, t he Cont r act or wi l l gi ve t he appr oval t o r est r i c t t he out l et wor ks t o meet t he mi ni mum r equi r ed 5 cf s di schar ge.

Reser voi r f i l l i ng wi l l be per f or med by t he t he Cont r act or and US Ar my Cor ps of Engi neer s Const r uct i on of f i ce st af f wi t h gui dance f r om Engi neer i ng st af f . St af f f r om geot echni cal and st r uct ur al di sc i pl i nes wi l l moni t or t he dam behavi or and pr ovi de i nput t o t he Cont r act i ng Of f i cer .

Bef or e Fi l l i ng begi ns, t he Cont r act or needs t o conf i r m t hat :

a. I ni t i al I nspect i on has been compl et ed sat i sf act or i l y and t hat any i ssues have been r esol ved.

b. Access r oads l eadi ng t o t he r eser voi r pool have been bar r i caded.

c. Reser voi r c l ear i ng has been compl et ed.

d. Cor por at e Communi cat i ons has pr ovi ded necessar y not i f i cat i ons t o

SECTI ON 01 11 00 Page 4 t he Cont r act i ng Of f i cer .

e. The Gover nment has pr ovi ded necessar y not i f i cat i ons t o t he publ i c, st akehol der s and st at e and l ocal gover nment agenci es.

The Cont r act or wi l l not i f y t he Cont r act i ng Of f i cer at l east 10 days i n advance of c l osur e.

The Cont r act or and USACE engi neer s wi l l super vi se t he i ni t i al f i l l i ng, moni t or t he i nst r ument at i on and pr ovi de t echni cal deci s i ons t o oper at e t he Dam. Techni cal deci s i ons wi l l be communi cat ed t o t he USACE Char l est on Resi dent Engi neer on a weekl y basi s or i f unexpect ed behavi or of t he Dam occur s.

3. 1. 2 Reser voi r Fi l l i ng

The met hod of f i l l i ng t he r eser voi r i s usi ng pr eci pi t at i on ( obser ved) .

Thi s pr ocess depends f ul l y on met eor ol ogi cal i nf l uence and seasonal t r ansi t i ons, i n whi ch i t coul d t ake a f ew mont hs t o f i l l t he r eser voi r .

The r eser voi r i s nor t h of t he Dam Embankment wi t h a nor mal pool capaci t y of 120 acr e- f eet , and t he maxi mum capaci t y i s 490 acr e- f eet .

3. 1. 3 Pr ef er r ed Fi l l i ng Rat e

The pr ef er r ed f i l l i ng r at e wi l l be cont r ol l ed by moni t or i ng t he r i se i n pool el evat i on t o r egul at e t he downst r eam di schar ge. Thi s wi l l pr ovi de a s l ow f i l l i ng of t he r eser voi r and an oppor t uni t y t o moni t or and eval uat e i nst r ument at i on dur i ng t he s l owl y i ncr eased r eser voi r l oadi ng. St or m event s wi l l be ant i c i pat ed and i mpoundment l evel s moder at ed ( as much as possi bl e) , wi t h t he out l et wor ks t o assur e t he i ni t i al f i l l i ng r at e occur s expedi t i ousl y and saf el y.

The r at e of f i l l i ng of Semmes Lake shal l not exceed one- f oot of el evat i on on t he ear t he embankment .

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SECTI ON TABLE OF CONTENTS

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

SECTI ON 35 01 70. 38

DAM I NSTRUMENTATI ON

04/17

PART 1 GENERAL

1. 1 SCOPE

1. 2 REFERENCES

1. 3 SUBMI TTALS

1. 4 QUALI FI CATI ONS

1. 4. 1 Dr i l l er and Geol ogi st

1. 4. 2 Dr i l l i ng Pl an

1. 4. 3 Manuf act ur er ' s Dat a

1. 4. 3. 1 Pi ezomet er s

1. 4. 3. 2 Movement Monument s

1. 4. 3. 3 Manuf act ur er Pr oduct

1. 4. 4 Compl et i on I nf or mat i on

PART 2 PRODUCTS

2. 1 PI EZOMETERS

2. 2 EMBANKMENT MOVEMENT MONUMENTS

2. 3 STRUCTURAL MOVEMENT MONUMENTS

2. 4 STAFF GAGES

PART 3 EXECUTI ON

3. 1 EXAMI NATI ON

3. 2 PREPARATI ON

3. 3 GENERAL I NSTALLATI ON REQUI REMENTS

3. 4 I NSTALLI NG PI EZOMETERS I N DRI LL HOLES

3. 5 EMBANKMENT MOVEMENT MONUMENTS

3. 6 STRUCTURAL MOVEMENT MONUMENTS

3. 7 STAFF GAGE I NSTALLATI ON

3. 8 QUALI TY CONTROL

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SECTI ON 35 01 70. 38

DAM I NSTRUMENTATI ON

04/17

PART 1 GENERAL

1. 1 SCOPE

Thi s sect i on cover s r equi r ement s f or :

12 Dr i l l i ng and i nst al l i ng new pi ezomet er s i ncl udi ng obt ai ni ng necessar y per mi t s. Det ai l s of pi ezomet er s ar e shown on t he dr awi ngs.

2. Fur ni shi ng and i nst al l i ng embankment movement monument s on t he dam cr est and st r uct ur al movement monument s on t he spi l l way st r uct ur es.

3. Fur ni shi ng and i nst al l i ng a r eser voi r st af f gage on t he spi l l way appr oach wal l .

4. Const r uct i on of V- not ch wei r s t o measur e seepage f r om t he t oe dr ai n syst em. Det ai l s of V- not ch wei r s ar e shown on t he dr awi ngs.

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.

ASTM I NTERNATI ONAL ( ASTM)

ASTM C190 St andar d Test Met hod f or Tensi l e St r engt h of Hydr aul i c Cement Mor t ar s

1. 3 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 Cont r act or Qual i t y Cont r ol appr oval . 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 al s wi t h an " S" ar e f or i ncl usi on i n t he Sust ai nabi l i t y Not ebook, i n conf or mance wi t h Sect i on 01 33 29 SUSTAI NABI LI TY REPORTI NG. 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

Pi ezomet er s Modi f i cat i on Pl an

G

Dr i l l i ng Pl an; G;

Pr of essi onal Geol ogi st or Geot echni cal Engi neer ; G

The Cont r act or shal l hi r e a Pr of essi onal Geol ogi st or Geot echni cal Engi neer , l i censed i n Sout h Car ol i na, t o pr ovi de i nspect i on of t he i nst al l at i on of pi ezomet er s. The Cont r act or shal l demonst r at e v i a

SECTI ON 35 01 70. 38 Page 2 a r esume and r ef er ences, as needed, t hat t he Geol ogi st or Geot echni cal Engi neer meet s t he qual i f i cat i ons r equi r ed her ei n.

The Geol ogi st or Geot echni cal Engi neer shal l have a mi ni mum of 5 year s of exper i ence i n t he desi gn and i nst al l at i on of pi ezomet er s f or at l east 5 pr oj ect s. The Geol ogi st or Geot echni cal Engi neer i s r esponsi bl e f or t he i nst al l at i on of t he pi ezomet er s. Submi t a wr i t t en r epor t , document i ng t he pi ezomet er i nst al l at i on. The Cont r act i ng Of f i cer and t he USACE Lead Geot echni cal Engi neer or Lead Geot echni cal Engi neer ' s Repr esent at i ve r eser ve t he r i ght t o r equest and shal l be gr ant ed meet i ngs wi t h t he Geot echni cal Engi neer at any t i me t hr oughout t he cont r act dur at i on.

The Cont r act or shal l submi t t he qual i f i cat i ons and r esume f or t he Pr of essi onal Geol ogi st or Geot echni cal Engi neer , f or t he appr oval by t he Cont r act i ng Of f i cer , at t he t i me of t he NTP.

SD- 02 Shop Dr awi ngs

Fabr i cat i on Dr awi ngs

SD- 07 Cer t i f i cat es

Driller and Geol ogi st or Geot echni cal

I nst r ument at i on I nst al l at i on Super vi sor

SD- 09 Manuf act ur er ' s Fi el d Repor t s

Piezometers

Movement Monument s

Manuf act ur er pr oduct dat a

SD- 11 Cl oseout Submi t t al s

As- bui l t dr awi ngs

1. 4 QUALIFICATIONS

1. 4. 1 Driller and Geol ogi st

Dr i l l er and Geol ogi st or Geot echni cal qual i f i cat i ons.

I nst r ument at i on I nst al l at i on Super vi sor

1. 4. 2 Dr i l l i ng Pl an

Pr oposed pl an f or pi ezomet er i nst al l at i on i ncl udi ng and dr i l l ed i nst al l at i ons t aki ng i nt o account al l i nf or mat i on f ur ni shed and al l r equi r ement s i mposed by t he Dr awi ngs and Speci f i cat i ons.

1. 4. 3 Manuf act ur er ' s Dat a

Manuf act ur er ' s Dat a f or al l mat er i al s and equi pment , i ncl udi ng t he

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1. 4. 3. 1 Piezometers

Manuf act ur er pr oduct dat a f or pi ezomet er s and pr ot ect i ve cover . .

1. 4. 3. 2 Movement Monument s

Br onze sur vey mar ker s, r ebar , concr et e, st eel pi pe and any ot her mat er i al s pr oposed f or use.

1. 4. 3. 3 Manuf act ur er Pr oduct

Manuf act ur er pr oduct dat a f or st af f gages and mount i ng har dwar e, and st r uct ur al st eel suppor t .

1. 4. 4 Compl et i on I nf or mat i on

Sur vey dat a f or new pi ezomet er t i ps and movement monument s, i ncl udi ng hor i zont al and ver t i cal posi t i on, usi ng t he same ver t i cal and hor i zont al dat um as i s shown on t he Dr awi ngs. Compl et i on i nf or mat i on shal l al so cont ai n compl et i on l ogs f or t he pi ezomet er s i ncl udi ng: t ot al l engt h of pi pe ( i ncl usi ve of st i ckup above gr ound and scr een i nt er val ) , appr oxi mat e t hi cknesses of sand, bent oni t e, pel l et s and gr out , el evat i on of t op of pi pe and el evat i on of gr ound.

PART 2 PRODUCTS

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2. 1 PIEZOMETERS

A. Pi ezomet er Pi pe: Pol yvi nyl chl or i de ( PVC) pi pe and f i t t i ngs shal l conf or m t o ASTM D3034, ASTM F758, Type PS 46.

B. Pi ezomet er Si l i ca Sand: Cl ean, uni f or m medi um No. 4 bl ast i ng sand wi t h l ess t han 3 per cent passi ng t he No. 200 st andar d U. S.

s i eve, or St andar d Ot t awa Sand conf or mi ng t o ASTM C190.

C. Pi ezomet er Bent oni t e: Pel l et s wi t h a maxi mum ¼- i nch di amet er and a dr y bul k densi t y of 82 pounds per cubi c f oot . Bent oni t e- Pi pel l et s manuf act ur ed by Pi ezomet er Resear ch and Devel opment Cor por at i on or appr oved equal . I n cases t hat r equi r e bent oni t e t o be mi xed wi t h ot her mat er i al s, a powder ed bent oni t e shal l be used wi t h a dr y bul k densi t y of 54 pounds per cubi c f oot .

D. Scr een pi pe shal l meet t he mat er i al r equi r ement s f or pi ezomet er pi pe, and shal l have f act or y- cut s l ot s havi ng wi dt hs of

0. 02 i nches at a spaci ng r ecommended by t he pi pe manuf act ur er and appr oved by t he Cont r act i ng Of f i cer ' s Repr esent at i ve.

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2. 2 EMBANKMENT MOVEMENT MONUMENTS

A. Embankment movement monument s consi st s of a cent er i ng devi ce embedded i n st r uct ur al concr et e wi t h st eel pi pe casi ng as shown on t he Dr awi ngs.

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B. No. 4 Rebar : ACI 301 unl ess ot her wi se speci f i ed. ASTM A 615/ A 615M and ASTM A 966/ A 966M wi t h t he bar s mar ked A, Gr ade 60. .

C. St r uct ur al Concr et e: I n accor dance wi t h Sect i on 03 30 00:

Cast - I n- Pl ace Concr et e.

D. Cent er i ng Devi ce: shal l be a st ai nl ess st eel or br ass i nser t 1. 25- i nch di amet er f abr i cat ed f or t he pur poses of t opogr aphi c sur vey monument at i on.

E. St eel Pi pe Casi ng: shal l conf or m t o t he r equi r ement s of ASTM A 53 and shal l be pai nt ed wi t h an epoxy coat i ng ( t r af f i c yel l ow) .

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2. 3 STRUCTURAL MOVEMENT MONUMENTS

A. St ai nl ess st eel concr et e i nser t 1. 25- i nch di amet er f abr i cat ed f or t he pur poses of t opogr aphi c sur vey monument at i on.

B. Nonshr i nk Gr out : ASTM C 1107.

2. 4 STAFF GAGES

A. St af f gages shal l be suppl i ed i n sect i ons, gr aduat ed i n 0. 1- f oot i ncr ement s, and mar ked ever y 1. 0 f eet of ver t i cal el evat i on as shown on t he Drawings.

B. Mount i ng Boar ds: Mount t he gage sect i ons and number s on 2 x 12 i nch st r uct ur al r ecycl ed pl ast i c l umber as r ecommended by t he gage manuf act ur er .

Use col or ext r uded st r uct ur al r ecycl ed pl ast i c l umber f or number s and gage sect i ons. Pr ovi de suf f i c i ent boar d l engt h so t he gage and number s ar e compl et el y suppor t ed f r om t op t o bot t om.

C. Gage shal l be at t ached t o 4- i nch di amet er SCH 40 gal vani zed st eel pi pe as shown on t he Dr awi ngs.

PART 3 EXECUTI ON

3. 1 EXAMINATION

A. Ver i f y t he l ocat i ons and el evat i ons t hat t he dam and spi l l way st r uct ur e have been const r uct ed t o t he l i nes and gr ades shown on t he Dr awi ngs pr i or t o i nst al l at i on of t he pi ezomet er s t o be i nst al l ed i n bor ehol es, and f or t he i nst al l at i on of movement monument s.

B. Ver i f y t hat al l dr i l l hol es have been dr i l l ed t o t he cor r ect s i ze, dept h and or i ent at i on pr i or t o i nst al l at i on of i nst r ument s.

3. 2 PREPARATION

A. Pr ot ect st r uct ur es, f aci l i t i es, i nt er nal seepage col l ect i on syst ems, and f aci l i t i es dur i ng dr i l l i ng of t he pi ezomet er s and movement monument s .

3. 3 GENERAL I NSTALLATI ON REQUI REMENTS

A. Fur ni sh al l l abor , equi pment , mat er i al s, power suppl i es and i nci dent al s r equi r ed t o i nst al l a compl et e, f ul l y f unct i onal , r eady- f or - oper at i on i nst r ument at i on ( cont r ol and moni t or i ng) syst em as speci f i ed and as shown on t he Dr awi ngs.

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3. 4 I NSTALLI NG PI EZOMETERS I N DRI LL HOLES

I nst al l at t he l ocat i ons and el evat i ons shown on t he Dr awi ngs.

I nst al l new st andpi pe pi ezomet er s i n 6- 1/ 4- i n. di amet er hol l ow- st em auger bor i ngs as shown on t he Dr awi ngs. Use t he f ol l owi ng i nst al l at i on procedures:

1. Dr i l l t o t he el evat i on shown on t he Dr awi ngs.

2. I nst al l t he pi ezomet er s as f ol l ows:

a. Lower t he pi pe wi t h bot t om cap down t he bor e hol e s l owl y and al l ow i t t o r est on t he bot t om of t he bor e hol e. Measur e t he dept h of t he pi pe.

b. Whi l e keepi ng t he pi pe r est i ng on t he bot t om of t he bor e hol e, pour pi ezomet er sand i nt o t he bor ehol e bet ween t he auger and t he pi pe i n i ncr ement s of 6 t o 12 i nches, car ef ul l y r ai s i ng t he auger f l i ght s s l i ght l y l ess t han t he dept h of sand pl aced i n t he f l i ght s af t er each i ncr ement . Cont i nue t hi s pr ocedur e t o a hei ght above t he t op of t he s l ot t ed pi pe as shown on t he Dr awi ngs or as appr oved i n t he f i el d by t he COR. Al l ow t he sand t o set t l e, and measur e t he dept h t o t he t op of t he sand l ayer .

c. Sl owl y pl ace a 3- f oot - t hi ck seal consi st i ng of bent oni t e pel l et s; ensur e no br i dgi ng occur s. Rai se t he auger f l i ght s 3 f eet . Tamp t he seal f i r ml y i nt o pl ace.

d. Backf i l l t he bor ehol e wi t h cement - bent oni t e gr out as descr i bed bel ow. Si mul t aneous r ai s i ng of t he auger f l i ght s shal l t ake pl ace i n no gr eat er t han 12- i nch i ncr ement s unl ess ot her wi se appr oved by t he COR. Cont i nue t hi s pr ocedur e t o t he gr ound sur f ace. Measur e t he dept h and/ or t hi ckness of t he gr out l ayer as appr opr i at e.

e. Cap bor e hol e wi t h concr et e pad, 3- i nch t hi ck x 15- i nches i n diameter.

f . St ai nl ess St eel Cover shal l be embedded i n t he concr et e pad and pi ezomet er secur ed wi t h a l ocki ng cap.

3. Pl ace t he cement - bent oni t e gr out backf i l l descr i bed above usi ng t he f ol l owi ng pr ocedur es:

a. Gauges on gr out l i nes shal l be of t he noncl oggi ng t ype, or c l oggi ng shal l be pr event ed by usi ng gauge saver s.

b. Gr out pumps of t he posi t i ve di spl acement t ype havi ng a capaci t y of not l ess t han 40 gpm at a di schar ge pr essur e of 25 psi shal l be used. Cent r i f ugal - t ype pumps may be used onl y i f approved.

c. A sui t abl e gr out mi xer of t he mechani cal or vent ur i t ype wi l l be r equi r ed t o obt ai n a t hor oughl y mi xed, uni f or m, hi ghl y pl ast i c gr out mi xt ur e. A hol dover t ank equi pped wi t h a mechani cal agi t at or wi l l be r equi r ed t o keep t he gr out i n uni f or m

SECTI ON 35 01 70. 38 Page 6 suspensi on. Pr ecaut i ons must be t aken t o avoi d c l oggi ng or f ai l ur e of t he pump t o pump t he gr out down t he hol e t hr ough t he gr out t ube. Hand mi xi ng of gr out wi l l be per mi t t ed onl y upon speci f i c appr oval i n each case.

d. The gr out mi x shal l consi st of Por t l and cement , pul ver i zed bent oni t e, and wat er i n pr opor t i ons as di r ect ed. Por t l and cement shal l conf or m t o t he r equi r ement s of Sect i on 03 31 01:

Cast - i n- Pl ace Concr et e. Cement shal l be f ur ni shed i n 94- l b sacks and shal l be st or ed and pr ot ect ed t o pr event cont ami nat i on, exposur e, and f or mat i on of l umps. Bent oni t e shal l be a nat ur al Wyomi ng sodi um bent oni t e cont ai ni ng no addi t i ve, gr ound t o pass a 200 mesh si eve. Bent oni t e shal l be f ur ni shed i n sacks and shal l be f r ee of l umps and f or ei gn mat t er . Wat er shal l be c l ean and f r ee f r om i nj ur i ous amount s of oi l , aci d, or gani c mat t er , sal t , or ot her del et er i ous subst ances.

e. The gr out mi x r at i o ( wat er / cement ) wi l l be expr essed i n gal l ons of wat er per 94- l b sack of cement . The wat er / cement r at i o wi l l be var i ed as di r ect ed, gener al l y 3: 1 or t hi cker . Al l gr out shal l cont ai n one t o t hr ee pounds of pul ver i zed bent oni t e per 94- l b sack of cement , as di r ect ed by t he COR. The met hod of addi ng and mi xi ng bent oni t e shal l r esul t i n a uni f or m and t hor ough di sper si on of t he gr out . A smoot h s l ur r y shal l f i r st be pr epar ed by mi xi ng about one pound of bent oni t e per sack of cement wi t h t he wat er and t hen addi ng t he cement . The r emai nder of t he bent oni t e shal l t hen be added af t er t he cement . The gr out shal l be t hor oughl y mi xed t o pr oduce a uni f or m, hi ghl y pl ast i c mi xt ur e.

Changes i n t he wat er / cement and bent oni t e/ cement r at i os beyond t he l i mi t s di scussed above must be speci f i cal l y appr oved. Cal c i um chl or i de or ot her admi xt ur e appr oved by t he COR may be added t o t he gr out mi xt ur e t o shor t en t he t i me r equi r ed f or t he gr out t o set up.

f . Gr out t he hol es over t he f ul l di amet er f r om t he t op of t he bent oni t e pel l et seal i n a cont i nuous oper at i on t o t he dept h of t he upper l i mi t of gr out i ng as speci f i ed. The vol ume of gr out t o be mi xed shal l not be l ess t han t he cal cul at ed vol ume of t hat por t i on of t he hol e t o be gr out ed. Tr emi e t he gr out down t he hol e t hr ough a t ube or pi pe ext endi ng t o wi t hi n t wo ( 2) f eet of t he bot t om of t he bor ehol e under a pr essur e at t he gauge of not mor e t han hal f of t he est i mat ed over bur den pr essur e ( as appr oved by t he COR) at t he t i p of t he gr out pi pe, unt i l t he gr out l evel i n t he casi ng i s at l east l evel wi t h t he desi gned f i nal gr out l evel . The auger s shal l t hen be wi t hdr awn t o t he r equi r ed dept h and gr out added t o t he bor ehol e i n i ncr ement s such t hat t he gr out l evel never dr ops bel ow t he upper l i mi t of gr out i ng as speci f i ed. I n al l cases, t he amount of exposed bor ehol e bet ween t he bot t om of t he auger s and t he upper sur f ace of t he gr out shal l never exceed 12 i nches. Ot her pr ecaut i ons or pr ocedur es may be i ndi cat ed i f bor ehol e cavi ng occur s dur i ng ext r act i on of t he auger s.

3. 5 EMBANKMENT MOVEMENT MONUMENTS

A. I nst al l movement monument s at t he l ocat i ons shown on t he Dr awi ngs.

B. I nst al l movement monument s usi ng t he f ol l owi ng pr ocedur es.

1. Const r uct monument as shown on t he dr awi ngs.

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3. 6 STRUCTURAL MOVEMENT MONUMENTS

A. I nst al l s t r uct ur al movement poi nt s on t he spi l l way at t he l ocat i ons shown on t he Dr awi ngs.

B. Dr i l l a hol e of sui t abl e di amet er i n accor dance wi t h t he epoxy manuf act ur er ' s i nst r uct i ons i n t he concr et e and i nst al l s t ai nl ess st eel insert

3. 7 STAFF GAGE I NSTALLATI ON

A. I nst al l s t af f gages i n accor dance wi t h t he manuf act ur er ' s wr i t t en i nst r uct i ons, Dr awi ng det ai l s , and t hi s Sect i on, unl ess ot her wi se appr oved.

C. Sur vey t he spi l l way st af f gage so t hat when i nst al l ed, t he t op of t he st af f gage cor r esponds t o t he t op of t he spi l l way wal l .

B. I nst al l s t af f gage sect i ons so st af f gage mar ki ngs r emai n accur at e i n gage el evat i on t hr ough t he i nst al l ed sect i ons.

C. I nst al l separ at e el evat i on number pl at es f or Type E gages cent er ed at each ver t i cal f oot adj acent t o t he gage sect i ons. The t op and bot t om el evat i on number pl at es may be i nst al l ed f l ush wi t h t he bot t om and t op of t he gage r espect i vel y.

D. I f s t af f gage sect i ons need t o be of f set , pr ovi de a 1- f oot over l ap bet ween t he of f set sect i ons.

3. 8 QUALI TY CONTROL

A. Sur vey al l compl et ed i nst r ument at i on i nst al l at i ons and r ecor d f i nal el evat i ons and l ocat i ons f or as- const r uct ed dr awi ngs as f ol l ows:

1. Pi ezomet er s. Pi ezomet er t i p el evat i ons and l ocat i ons.

2. St r uct ur al Movement Monument s.

3. Embankment Movement Monument s.

4. St af f Gages: Sur vey t op and bot t om mar ki ngs f or al l manuf act ur ed gages usi ng sur vey accur at e t o t he near est 0. 02 f eet ver t i cal l y .

B. I n t he event t hat any st andpi pe pi ezomet er i s damaged t o t he ext ent t hat i t i s not sui t abl e f or accur at e wat er l evel measur ement s as det er mi ned by t he COR, t he Cont r act or wi l l be r equi r ed t o per f or m t he f ol l owi ng act i ons as di r ect ed by t he COR at no cost t o t he Gover nment :

1. Seal t he bor i ng or st r uct ur e i n accor dance wi t h St at e Regul at i ons f or pi ezomet er abandonment .

2. I nst al l an equal pi ezomet er i n accor dance wi t h St at e Regul at i ons adj acent t o t he abandoned st r uct ur e at a l ocat i on appr oved by t he COR usi ng mat er i al s and pr ocedur es as appr oved by t he COR.

C. The Cont r act or shal l submi t as- bui l t pi ezomet er l ogs t hat i ncl ude: 1) t ot al l engt h of pi pe i ncl usi ve of st i ck- up above gr ound, scr een i nt er val ,

2) appr oxi mat e t hi cknesses of sand, bent oni t e pel l et s, and gr out , and 3) el evat i ons of t op of pi pe and gr ound sur f ace.

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