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MIXVBA'J? MAJ*JMSRM£KI 9k VICE

Oulf Of M«Xi 0C8 Rfpion

Now Orleans, JJulftiam

• m - O W C I f l C yuVIRC .4FMTAL AJBXfe- iXSTT

E»f *39JWT> bv S V » <nUM REMOV*X<f)

OC. IP/SB #>-009, 070, siid .71

9truetur* suae A c t i v i t i s s

Ship dhosl Arcs, Blocks 194 smt 10, Lsssss OCO 0420 snd 0419

Juns 4, 19»2

UNITED STATES DEPARTMENT OF THE INTSRIOR

MINERALS MANAGEMENT SERVICE

G u l f of Mexico 3 Rogion

Nov Orleans , L o u i s i a n a

FINAL

a i T E - S P E C I F I C ENVIRONMENTAL ASSESSMENT

ENDANGERED 8 PEC IES/STRUCTURE REMOVAL (8)

f4r E S / S R 92-069, 070, 071

•nt of ths Environmental Iepacta of the Propoeed Reaovele of P l a t f o r a a No.13, D, and A ln Ship shoal Aree,

Blocka 154 and 150 (Laaaaa OCS 0420 and 0419)

Dete S u b a l t t e d : Apr I 29, 1992 Coaaencsaent Deta July 1992

Prepared by Richard T. Bennett

FINDING OF NO SIGNIFICANT INPACT

I have considered ths not i f i ca t ion by chevron U.S .A. , Inc. to

reaove Pletforae No. 13, D, end A in Ship Shoel Area, Blocka 134

and 150 (Laaaas OCS 0420 and 0419), SEA No. ES/SR 92-069, 070,

and 071. Beeed on the environaentel ana. ale contained in the

s i t a - a p o c i f i c anvironmantal eeeeeeaent, there ie no avldence to

indicete thet the propoaad ectlone v i l l e ignif icent ly (40 CPR

1509.27) effect the quelity of the huaan environment i f the

peral t /eppl icat ion i s eppn »d aubject to the a i t igat ive

aeeeuree. Preperation of an environaentel lapect atateaent le

not required.

•Eoeeing end Environaent Gulf of Nexico 009 Region

i i

TABLE OF CONTENTS

PAGE

FINDING Or NO SIGNIFICANT IMPACT i l

INTRODUCTION AND BACKGROUND 1

I . DESCRIPTION OP THE PROPOSAL(S) AND NEED FOR THE PROPOSAL(S) 1

A. DESCRIPTION OP THE PROPOSED ACTION(8) WITH NITIGATION 1

B. NEED rOR THE PROPOSED ACTION (8) 1

I I . ALTERNATIVES TO THE PROPOSED ACTION(8) 2

A. NONRENOVAL OF THE STRUCTURE(8) 2

B. REMOVAL OF THE STRUCTURE(S) BY ALTERNATIVE NON-EXPLCSIVE METHODS 2

C. REMOVAL OF THE STRUCTURE(8) AS PROPOSED NITH ADDED MITIGATION(S) 2

I I I . . ENVIRONNENTAL EFFECTS, SOCIOECONOMIC CONCERNS, AND

OTHER CONSIDERATIONS 3

A. PHYSICAL ENVIRONMENT 3

1. Environmental Geology and Geologio Hasarda 3

2. Mataorological Conditiona 3 3. Phyaical and Chemical Oceanography 3

a. Phyaical Oceanography 3 b Chemical Oceanography 3

4. Mater Quality 3

5. Air Quality 4

B. BIOLOGICAL ENVIRONMENT 4

1. Coastal Habitete 4

2. Protected, Endengered, and/or Threetened Speciee 4 a. Birde 4 b. Narine Mammala 4 c. See Turtlee 4

3. Birda 3

4. Seneitive Merino Hebitats -

5 . Offshore H a b i t a t a and Biota

C . SOCIOECONOMIC CONCERNS

1. Employment

2 . Econoaica

3 . Onahore Support F a c i l i t i e s , Land U s s , snd c o s s t a l Coaaunities and S e r v i c e s

D. OTHER CONSIDERATIONS

X. Coaaarcial end R e c r e a t i o n a l F i a h e r i e e a. C o a a e r c i e l F i e h e r i e e b. R e c r e e t i o n e l F i a h e r i e a

2 . Archaeological Reeourcea

3 . N i l i t a r y Use/Warning Areaa and E x p l o e i v e Duaping Areaa

4 . Navigation and Shipping

5 . Pipel inee end Ceblee

6 . Other Ninore l Reeourcee

7. Huaan Heelth end Sefe ty

E . UNAVOIDABLE ADVERSE INPACTS

I V . PUBLIC OPINION

V . CONSULTATION AND COORDINATION

VX. BIBLIOGRAPHY AND SPECIAL REFERENCES

V I I . PREPARERS

V I I I . APPENDICES

A . CHEVRON U . 8 . A . INC. CORRESPONDENCE

B. NNFS CORRESPONDENCE

TABLE 1 - Explos ivss Propossd by ths Opsrs tor f o r ths Structurs Rsaova l e in Ship Shoal Aree , Blocks 154 end 150

INTRODUCTION AND BACKGROUND

The purpose) of t h i s S i t e - S p e c i f i c Environmental A s s s s s s s n t (SEA) i s to aaaaaa the s p s c i f i c impacta a s s o c i a t e d with propoaad a t r u c t u r e - r e a o v a l a c t i v i t i e a . The SEA i s based on s Prograaaat i c Environmental Aaaeaaaent (PEA) (USDOI, MMS, 1987) which eva luatea a broader apectrua of p o t e n t i a l iapacta r e s u l t i n g f r o a ths r s a o v s l of s t r u c t u r s s ; e . g . , p l a t f o r m s / c a i s s o n s acroaa tha c e n t r a l and western p lann ing areaa of the Gul f of Mexico Outer C o n t i n e n t a l S h e l f . Tho PEA/SEA proceoa i s dss ignsd to s i m p l i f y snd r sducs ths s i t s of environmental aaaeaaaent docuaenta by e l i m i n a t i n g r e p e t i t i v e d i s c u s s i o n s of t h s aame i s s u s s . T h i s SEA conf o r a s to MMS and o ther eppropriate g u i d e l i n e s f o r prepar ing env ironaonta l aeeeeement. by u t i l i s i n g data p r e s s n t s d i n t h s PEA t o c o a p l s t s ths a s s s s s a s n t . I t presents s i t e - s p e c i f i c d s t s r s g a r d i n g the propoaed s t r u c t u r s r s a o v a l ( a ) and eva luates t h s p o t e n t i a l iapacta . M i t i g a t i o n meaauraa are contained i n t h i a document to l s s s s n p o t s n t i a l i a p s c t s . P r s p s r s t i o n of t h i s 8EA hee e l l o v e d the de tena inat ion of vhether e F inding of No S i g n i f i c a n t Iapact (FONSI) i a appropriate or whether f u r t h e r a s s s s s a s n t of ths proposal (a) i a neceaaary.

I . DESCRIPTION OF THE PROPOSA AND NEED FOR THE PROPOSAL(S)

A. DESCRIPTION OF THE PROPOSED ACTION(S) WITH HITIGATION

Chevron U . S . A . I n c . proposss to rsaovs Platforms No. 13, and D, i n Ship Shoal Block 154, and P l a t f o r a A i n Ship Shoal Block 150. The atructures s r s l o c a t s d i n a water deptha of 64 and 61 f o o t reapect ive ly and l i e epproxiaete ly 34 a i l e e eouth of Terrebonne Par iah , L o u i e i e n e . The operator plane to e x p l o s i v s l y s s v s r snd remove ths p i l s s snd w s l l caaing a t r i n g a . See Table 1 f o r s p s c i f i c data r s g a r d i n g ths s x p l o s i v s r s a o v a l operat iona .

Refer to Appendix A f o r s t r u c t u r s s p e c i f i c s t i o n s for t h s r s a o v s l ( s ) , add i t iona l date on reaoval techniquee , and sequence o f eventa .

NITIGATION

Refer to the o p e r a t o r ' s proposal (Appsndix A) f o r m i t i g a t i v e a s a s u r s ( s ) propossd to r sducs ths l i k s l i h o o d of dsath or i n j u r y t o s s a t u r t l e a and a e r i n e a a a a a l a .

B . NEED FOR THE PROPOSED ACTION (S)

A dlacuaaion of the l e g a l and regulatory aandatee to reaove abandoned o i l and gaa a t r u c t u r e a froa Fed era l watere can be found i n the PEA (USDOI, MMS, 1987). According to Chevron, the r e s e r v e s hava been d s p l s t s d .

1

I I . ALTERNATIVES TO THE PROPOSED ACTION(S)

A l t e r n a t i v e s to t h s propossd s t r u c t u r s r soova i (a) v i t h m i t i g a t i o n o r i g i n a l l y submitted a r a :

A. NON-REHOVAL OF THE STRUCTURE(S)

T h s operator vould not proceed v i t h tho propoeed removal ( s ) . T h i s a l t e r n a t i v a vould s l i m i n s t s ths p o s s i b i l i t y t h s t s e i t u r t l e s , msrins mammala o r o ther merino l i f e vould be harmed by remove l of the a t r u c t u r e ( e ) ee propoeed. However, non-removal of the e t r u c t u r e (a) vould ropreeent a c o n f l i c t w i t h Federa l l e g e l and r e g u l e t o r y requirements , which mandate t h s t imely removal of o b e o l e t e or abandoned e t r u c t u r e e v i t h i n e p e r i o d of one yeer e f t e r termination of the l e e e e , or upon terminet ion of a r i g h t of uee o f eaaessnt. T h s r s f o r s , non-removal doee not appeer to be a v a l i d e l t e r n e t i v e .

B . RENOVAL OF THE STRUCTURE(S) BY ALTERNATIVE NON-EXPLOSIVE METHODS

The NMS hae diecueeed ver ioue a tructure-removal techniquee i n t h e F i n e l Environmental l apec t Stataaent ( F E I S ) for Propoaed O i l and Gee Leaae Se lee U S end 122 (USDOI, MMS, 1988) end the PEA (USDOI, NMS, 19S7) . Updated i n f o r a a t i o n i o e leo found i n the F E I S f o r Salea 123 and 125 (USDOI, HNS, 1989) . I t wee concluded t h e t t h e aoet e f f e c t i v e aethode of a t r u c t u r e reaovel ere the uee o f exp loe ivee , e i t h e r b u l k o r ehaped chergee, end underveter e r e c u t t i n g . Othar aethods eppeer pros i s ing but r s q u i r s a d d i t i o n a l development to aolvs t h s o p e r e t i o n s l snd l o g i s t i c s l problsms s s s o e l s t s d with t h s s s t s c h n i q u s s . P r i m a r i l y f o r t h i a reaaon, theeo methoda do not appeer to be f e e e i b l e a l t e r n a t i v e s f o r the remova l of tha aubject e t r u c t u r e ( a ) .

R e f e r to the F E I S (USDOI, HMS, 1988) and PEA (USDOI, NMS, 1987) f o r detai led i n f o r m a t i o n concerning e l t e r n e t i v e aethode of e t r u c t u r e reaoval .

C . REMOVAL OF THE STRUCTURE(S) AS PROPOSED WITH ADDED MITIGATION

I t hee boon determined tha t tlie propoeed operatione f e l l w i t h i n the category of e c t i v i t i e o covered by the National Herine F i e h e r i e e Service (NNFS) B i o l o g i c e l Opinion of J u l y 25, 19SS, w h i c h eddraeeee "standard" exploaiva e t r u c t u r e removals i n the G u l f o f Nexico (C H) .

Re fer to the terme end conditione of the "generic" I n c i d e n t a l Teke Statement (Appendix B ) , end eny mi t iga t ion i d e n t i f i e d by t h i e SEA neceeeery to reduce the l i k e l i h o o d of d e e t h or injury to eee t u r t l e e and marine mammala.

2

I n tho court* of t h i s evaluation, sn additional protective measures vaa identif ied to further mitigate the environaentel i apac ta associated v i t h the propoaal. Appropriate reguletione and procedurea are believed aufficient to prevent aignif icant advarae iapacta.

Our analyaia indicates that there s r s sxist ing pips l ins(s ) loce ted vithln 150 aetere (490 feet) of the propoeed e c t i v i t i e e . Tho exist ing pipsl inss asy pose a hazard to the propossd opsrs t ions . Prscsutions in accordance with NTL 83-3, Section I V . B, w i l l be taken p r i o r to performing the propoeed opsrstions.

I I I . ENVIRONMENTAL EFFECTS, SOCIOECONOMIC CONCERNS, ANO OTHER CONSIDERATIONS

A. PHYSICAL ENVIRONMENT

1. Environaontal Geology and Geologic Hazarda

A discussion of environaontal geology and geologic hazarda can bn found in the PEA (USDOI, NMS, 1987). The propoeed etructure-reaoval a c t i v i t i e e are not in en eree of eediaent i n s t a b i l i t y (aud f love , eluape, or a l idee ) . Therefore, geologic condit iona are not expected to have en iapact on the propoeed etructure-reaoval e c t i v i t i e s .

2 . Netsorologicsl Conditions

No iapaets are expsctsd ss a r s su l t of the propoeed s c t i v l t i s s . For s n s l y s i s inforaation, sss ths PEA rsfsrsncsd in tha Introduction.

3. Phyaical end Chenicel Oceenogrephy

a. Phyeicel Oceanography

No iapacta are expected aa a reault of the propoeed e c t i v i t i e a . For anelyeie inforaation, eee the PEA referenced in tho Introduction.

b. Cheaical Oceenography

Inpecte are expected to be very low ee e reeult of the propoeed ect ivi t iee . Por enelyaia infornation, eee the PEA referenced in the Introduction.

4. Hater Quality

Iapacta are expected to be very low ee e reeult of the propoeed act iv i t iee . Por enelyaia information, eee the PEA referenced in the Introduction.

3

9. Air Quality

Iapacta ara axpactad to ba vary lov aa a raault of tho propoaod ac t iv i t iaa . Por analyaia inforaation, soa tho PEA roforoncod in tha Introduction.

B. BIOLOGICAL ENVIRONMENT

1. Coaatal Habitata

No iapacta ara axpactad aa a raault of tha propoaad a c t i v i t i a a . For analyaia infornation, aoo tha PEA rafarancad in tho Introduction.

2. Protected, Endangered, and/or Threatened Speciea

a. Birda

The PEA (USDOI, MMS, 1997) delineatea aeneitive areaa along thn Taxaa coaatlino where whooping cranee and brown policana could ba advaraaly lap .ctad by atructura-roaoval aupport a c t i v i t i e a . The operator haa indicated that helicopter f l ighto and boat t r a f f i c would u t i l i z e a ahorobaee in Leevi l le , Louiaiana. No iapacta on threatened or endangered birda and t h a i r habitata aro expected.

b. Nerlno Maanela

A dlacuaaion of aerine aaaaala occurring acroae the GOM end en eeeeeeaent of the potentiel iapecte of etructure-reaovel a c t i v i t i e a on aarine aaaaala can bo found in tha PEA (USDOI, MMS, 1987). Fr i t ta . at a l . (1993) eonduetod a a r i a l aurvaya acroaa a 9,514 eqvare a l i a eree of GON vetere. Reeulte of theee aurveya indicate that the bottlonoee dolphin ie probably the aeet l ike ly nar ine aaaaai to be encountered et the propoaed etructure renovel (a). NMS obaervera aay be u t i l i s e d to look for aerine mammala prior to detonetion of the prinary cherge (a) at the reaovel a i te(a) . I f aerine aaaaala ere detected at tha atructure-reaoval a i t e ( a ) , detonation of the priaary charge(a) would bo delayed u n t i l the animala are removed froa tha aree(e) . I n epite of theee preceutione, e low probability exiate that nerlno aaaaa la could enter the bleet aree(e) undetected and could bn injured or k i l l e d by the underwater, eubeurface de tonat ions Such an occurrence i e coneidered highly unlikely and wit-1-lndiceted protective e l t lget lon aeeeure(e). the propc structure-removal e c t i v i t i e a are expected to heve or iapact on aarine aaaaele.

c. See Turt lee

A diecueeion of eee turtlee occurring ecroaa .antral and weatern GON end an eeeeeeaent of the potential imp. » of

4

•truetur*-reaoval a c t i v i t i a a on aea tur t l ea cen be found in the PEA (USDOI, 1048, 1987). Studiea bv F r i t t a , at a l . (1983) and F u l l e r and Tappan (1986) aa well aa atranding data froa the Sea Turt le Stranding and Salvage Network (Teae and Martinez, 1992) indicate that aea t u r t l o a occur in tha vi 'ttty f tha propoaed a c t i v i t i a a and therefore could be impact* ui« etructure-rer-^val operationa. Definit ive inforoatl: . . oi. a probability of encountering aaa t u r t l o a at tha raaoval a i t a (a) during axploaiva oparationa ia acarco. NNFS and/or MMS obaervers aay be u t i l i s ed to look for aaa t u r t l a a prior to datonatlon of tha priaary chargo(e). I f aaa t u r t l a a ara datactad at tha etructure-removel e i t e ( e ) , detonation of the priaary charga (a) w i l l ba dalayad u n t i l tha animala ara removed froa tha araa (a) . Aa in tha caaa of aerine aaaaele, the poeeibil ity exiete that aea turt lee could enter the blaat aree(e) undetected and could be injured or k i l l ed by the underwater, aubeurface detonation(e). Thie occurrence ia coneidered unlikely, end with the lndiceted protective a i t igat ion measure(e), the propoeed etructure-reaovel ac t iv i t i ea are expected to have only a low lapect on eee turt lee . A cumulative incidental take hae boon euthorised by NMFS for thia category actiona, but with a l l the preceutione to be teken aa mitigating meaaure(s), i t i a un l ika ly that any aea turt lea w i l l bo affactad by thaaa propoaad oparationa.

3. Birda

Iepacta era expected to be very low ee a reeult f tho propoaed ac t iv i t i ee . For enelyaia lnforaetlon, eee the PEA referenced in the Int action.

4. Seneitive na Habitete

A dlacuaaion of eeneitive eerine hebltete occurring in the central and veatern GOM and an eeeeeeaent of the potentiel lapecta of etructure-reaoval ac t iv i t i ee on theee areee cen oe found ln the PEA (USDOI, NMS, 19S7). The propoaed a c t i v i t i e e ere not neer eny aeneitive aarine habitato. The aubject etructure-reaoval ect ivi t iee v i l l not iapact any eeneitive aerine hobitoto or their roeident biote .

5. Offahore Hebltete end Biote

Iapacte ere expected to be lov ee e reault of the propoaod a c t i v i t i a a . For anelyeie inforaation, aee the PEA referenced in the Introduction.

5

c. soc: W.CNONIC CONCERNS

1. Employment

Impacts ara axpactad to ba vary low aa a raault of thu propoaad sctivitiaa. Por analyaia information, soa tha PEA rafarancad ln tha Introduction.

? Econoaica

Iapacta ara axpactad to oo vory low as a raault of t*ie propoaod activltloa. Por analyaia information, ara tha PxA rafarancad in tha Introduction.

3. Onahora Support Pacilitioo, La.vJ Uaa, and Coaatal Commu tiaa and Services

The operator haa indicated thet Leeville, Louxuaatw, vould be the ehore beee for the proposed etructure-reaoval ectivitiee. No lapeote ere expected ae e reeult of the propoeed act'ef Eft* . Por analyaia inforaation, aee the PEA referenced in thi Introduction.

D. OTNER CONS I'^RATIONS

1. Coraercial end Recreational ria'«riee

a. Coaaercial Pieheriee

Fer enelyeie lnforaetlon, eee the PEA referenced ln the Introduction. Since the PEA vee o*-< finally written, new concerns have emerged concerning the iapac v o% exploeive etructure i saovala on -»af fieh populations On ifey 9, 1991 the C <lf of hexico Fiehe. y Menagement Council ^>oreaeed concern over tne declining r'.ocks of reef fi-h, aape vtlly red enepper. They referred to the antidotal account*; »i! finfieh kille eeeoeiato<* with exploeive reaovals of offehore etructuree in offer to \ thoee activitiee vith •'heir concerts abou. decliniru topttlt * J of reef fieh. They fui char auogeet»v3 thet NHS ehould am**) exploeive etructure i . w ala in ebeyanre until u-»re in*i*.aa* < n beoeaee evelleble * i Mia effecte of thtoe ectivitiee on fieh etocke. See the rah .Jection on Offehore Habitat- end Slots) wr e diecueeion of I ish ..ilia in aaacciation with exploeive etructure reao aie

The NNS r*> declined to hold e l l exploeive etructure reaovele in au* *nee citing the reguletory aendatoe for etructure reaovele end p tJsaa with current non-explosivs structure reaoval sethocr. NMS hss ststsd s comm i t sent to carry out studiss to ssscss ths iapects of oi l and gae etructure reaovele on Oulf fieheriee reeourcea end the results of thsss studiss v l l l be ueed to deteraine future poi ic isa vith rear *et. to theee ectlvlviee

6

The- \%%% cciiri.it to consider ths overal l iapscts J I • t r u e urs rsaeva.' * 5. roaeerc i s l f ishing to be lov. The MHS p c i i - y of eneour a i i 4 sn ect ive r l q s - t o - t « s f e program v i l l help to of fear. cuauJati'. » acructure-rer.oval lapse* * f l s h s r i s s rssourcss-

b. V"* rsa t ional Piei.eriee

lapeote ere expected to bt *o% sa a te.-ult of the pt*r> •ssci a c t i v i t i s s . Per analyeie inforaation, sss tl.e PBA refer, r.c , ?.• the Zntroduction. See the preceding section for e diecjieli-n 01. f ieh k i l l e ln aaeocletion with explosive structure rea.- i l e .

2 . Archaeological Reeourcee

Iapecte ere expected to be lot ae e result of ths proposed a c t i v i t i e e . Por enelyeie lnforastlon, ass ths PEA referenced in the Zntroduction.

3. Military Uee/Mer r.ing Areee end Exploeive Duaping Ara/je

A daacription of a i l i t a r y uee/vam ing are' a end exploeive duaping areee, their locat i one end potent l e i iapecte of atructure-reaoval a c t i v i t i e e on theee areee een ba found ln the Pk\ (USDOZ, MMS, 1987). The propoeed etructun»-renov*j a c t i v i t i e e vould not teke piece in eny of thess a m e . Mo

t . -c te s r s sxpected.

4. Nevigetion end Shipping

The propoeed etructure-reaovel ec t iv i t i ee are nov 1 oca ted adiacent to a veeeel eefety fairway or it an anchorar rea. Stivetur^e loceted near ehore nay eerve r 9 Uandaarka *c v s s s s l s or hv' icop er operating in ths srss on <» regular beeie. T : » J overs* I lapK-.ts of ths propossd vork < t X nwigetio; P~ J a.tipping ere expacted to rs very lov. More inlormation on th•< lrjpaote of s tructurs rscov*. 1« n nsvigstion snd shipping can be > «5tf/*J in the PEA (USDCI. KMS J*.47).

5. Pipe;ince end Cablee

The PEA (USOOI, MMS, 19S7) c o n t U n e deecription of the iapacta of atructura-reaoval a c t i v i t y cn pipelinee end ceblee. There ere «xiet ing pipelinee v i thin .50 severe (490 feet; of the propoeed etructure-reaoval ac t iv i t i e e . Since the operetor auet adhere to existing lave end regul4*ions for abandonaent of 'tr.- roe (Including procedures inquired by Notioe to Lea aee a a ;d rv *-store No. S2-3), the propossd work v l l l not pose e hazard to r i e l ine (e) and cable(e) in the area(e).

7

6. Other Mineral Roaouroaa

Mo inpacta aro expe-i.e-J as o result of tho propossd s c t i v l t i s s . for analysis inforaation, a#s tha PEA rafarancad ln tha Zntroduction.

7. Huaan Haalth and Ssfsty

Tha PEA (usooz, MM" :«>«7) dsscrlbss tha hes»i dous conditions #or workers u\r\itq etructure-reaoval Wit iee. Tha oparator hea r-sj^oeed tha JO', of explosivss in onjuiction vith tha structure-rssoval ectivitiee. Existing legal end reguletory safety reguireaeiits v i l l keep the iapecte of the propoood vork on huaan heelch ond s o f . a t s very lov level.

E . UNAV OIDABLE ADVERSE IMPACTS

A u'swueelon oX unavoidable adveree iapacte ce.i he found in the PLA \iiirtOi, MMS, 1087). Tvo sress of ongoing concern heve baan tho potentiel iapact to protected, threet«;ied, end/or endangered species snd potsntial loee of habitat to the aerine environne.it. Both topics ere discusssd in the PEA end previouely ln thia docuaent. A aore racent ieeue of concern haa eurfeced regarding the iapscts of exploeive etructure reaovolo on reef fieh etocke. Thie ieeue hee been previouely diecueeed ln thie docuaent. * though the iapecte to coaaorciel and recreetionel fieheriee lr considered to be lev, further etudiee lnforastlon about thie issue ehould bs svsllsbls in ths futurs. Other unavoidable adveree ir?«^te ere coneidered to be ainor.

ZV. PUBLIC OPINION

A discus ,:*;., of public concerns regarding structure.' reaovele cen be found in the PEA (USDOI, MMS, 19S7).

In ttty 1991, the Oulf of Mexico Fisher/ Manageaent Council . 'quested hat the MMS piece e noratoriua over ths sxplosivs reaovsl o: offohora structu es vith three or acre aupports. Nonrsaova] of theee otructuree vould conflict viUi current Fadaral loqol ond regulatory requ ir ener *e vhich aendote the t inely rsaovsl of sbsndonsd or obsolsts etructuree vithin e period of ene yeer efter termination of the leeee, or upon termination ef e right-of-use or eeeenent.

The NMS believe*- th.it current dete on thc effecte of exploeive removele on f i sh mortality ie lneufflclent to drew er conclueione, and e moist' turn on a l l but eingle pile csissore M thia tlae ie u-juetlfisu Ir order to quantify exploeive affect',, the NMS inltistexi an interagency study vith ths NHr I to dec ine fieh aortelitlen r.'ron pletfora reaovel operatiom In

In* ••o the ebove etuiv r MMS aupport* en octlve rige-to-reef

Pr i t t s , T.H., A . l . Xrvlns, R.O. Jennlnge, L.A. Ccilua, w. Hoffman, ar 4 N.A. HcGehee. 1983. Turtles, blvd*, and mammals in ths northsn Oulf of Nsxico snd nearby Atlantic vstsrs. U.O. Fish snd Nil l i f s Ssrvlcs, Division of Biologies! services, Weehlngton, u.C.

Puller, D.A. end A.N. Terpen- 1986. The occurrence ot aee turtlee ln Louiaiana coeetai waters Cosstsl Fisheries Znetitute. Center for Setl^rvi Reeour .ee. Lculeiene Ststs Jni vere i ty. Brton Rouge, LA.

Teee, Wendy, 0. a d Anthony Nartinez. 1992. 1989 annuel report ef thn eee tu-cla strsnding snd eelvegs nstwork. Atlsntic snd Gu c>asts uf the united Otetee. Jenuery - Decsaber 1999. Netlonel Nerlno Fieheriee Service. Southeeet Pieheriee Center, Nlenl Laboratory, 79 Virgin a seech Drive, Nieni, PL.

U.S. Departaent of the Interior. Hiner-^e Nana tenant Service. 1*09. Pi nel Environaentel Iapact Stataaent. Ov'.f of Nexico Oelaa 123 and 125? Centrel end Wsstsrn Plsnning Arsss. OCS EIS/EA NMS 99-0053. Weehlngton, D.C. Available fron NTIS, Springfield, VAi Pe-99734900/AS.

U.O. Departaent of the Interior. Nl.ie."AlS Manageaent Service. 1990. Fi al Environaontal lapect Stataaent. Propoeed OCS oi l end gee l4wss eelee US end 122 (Central end Weatern Oulf of Nexico). OCS EIS/MMS 88-0044. Washington, D.C. Availabia fron NTIS, Springfield, VAs PB99-114199/A0.

U.O. Depertaent of the Interior. Ninerele M* .ig&aent Service. 19S7. Prograsaatic Environaentel Aeeeeeaent. structure-reaoval ect ivi t iee Control end Meetem Oulf of Nexico Plenning Areee. OCS/EA S7-0002. Gulf of Me*:4co OCS Region, Nev Orloene, LA.

10

prograa and enccura -<-. induatry to eearch for aethod that v l l l alnlalze affects on lieu froa pletfora reaoval operetione.

V. CONSULTATION AMD COORDINATION

In accordance vith the provlaiona of saction 7 of the Endangered spec -a Act, the propoeed atructure - rsaovsl operatione ere covered by the Biological Opinion iaeueu <*> MMFS on July 25, 19e9, vhich aatabllahad e category of "standard" exploaiva etructure-reaoval operetione. Their coaaenta era included if) Appendix B. The NMFS concluded thet thie category of etcuotvr* zeaoval activitiee v l l l not likely jeopardize the mr.cinued existence of any threetened or endengered epeciee under their purviev. Addi' i vnally, they concluded that thie type of •aMtaw * -d" struct-..'ve rsaoval activity aay reeult ln injury or tiortellcy oi letterhead, Keap'e ridley, green, hevkebill, and leetherbaek turtles. Therefore, they established e cuaulstlvs > rval of Is cidentel teke end diecueeed venous aeaauraa necessary co a*».lUr end ainlalsa thia lapect (ess Appv.-vJlx 0). The NMFS otsd thtt. no incidental taking of ear ne aastaele vee authorized

ur.der Sec len 101(e)(5) of the Merino Masse 1 Protection Act of 1972 in connection vith thie cetegory of etructure-reaovel ect iv i t les . Therefore, teking of aerine aeaaale by the operetor vould be prohibited unleee they eucceeefully epply for end obtain a peralt or vriver to do eo froa NMFS.

Teble 1

Explosive* Propossd by tho Opsrstor for tho structural-Rsaoval* ln Ship Shosl Arsa, Blocks 194 snd 150

TYPO of 1SP1OO1Y99»

Composition 9 or C-4 bulk explosives

Mnnhnr and mimm C*m-*mm,

Plstfore Ho. 13: Pour bulk chargaa of 40-pound charga for eech leg/pile(4) Tvo bulk chergee of 45-pound cherge and one bulk cherge of 39-pound for eech cssing(3)

Pletforn Dt Sixtssn bulk chsrgss of 40-pound chsrgs for sschlsg/pils(16) Plve bulk chargoa of 35-pound cherge for eech veil conductor(5) Bight bulk chergee of 35-pound charge for eech reinforcsesnt pUe(9)

Plstfors At Eight bulk chergee of 40-pound cherge for eech leg/pile(9) Two bulk chargee of 45-pound cherge end one bulk cherge of 50-pound charge for eech vei l conductor(3)

Pt Of Chsrgss>

19 foot belov the a- l ine

Multiple shots vith e 0.9 sscond deley betveen detonetione vith no nors than eight ehote in one eeguence

11

V I Z . PREPARERS

Authors

Richard T. Bsnnstt - Bio logis t

Typis ts

Ssndrs Psvlss - Clsrk Typis t

V I 1 1 . APPENDICES

A. CHEVRON U . S . A . INC. CORRESPONDENCE

B . NNFS CORRESPONDENCE

13

APPENDIX A

CHEVRON U.S.A. INC. CORRESPONDENCE

14

4 4

UNITED STATES OOVEItNNEST -A HEMORAMDQN

I I *

I2 1 ^ Tot Environuental Oparationa Saction (LE-5)

Front Offioa of Structural and Technical Support, Plaid Operationa. Oulf of Mexieo OCS Region (OSTS) . .

Subject: Platform leaoTel ' 4 ^ ^ T

QPEiuToi, Chevron AM* a 1992 ^

C c . t r . l S n , a w , 9 2 - 0 6 ^ . 0 7 0 , 0 7 ! " ' " 2 * ^ ^

P l a t f o m Area/Blook

fcV P l f lTTnnn Mil . S h i y thfloxl 1S4 flCS Q 4 1 Q 9 1 - 4 *

P l f l f r f i r f l D I S U - O C S Q 4 1 Q

— P h ^ - f o ^ ss »so ocs o<»iq Shore Beae: L f g v i j i e , I fl

Tha attached application la forwarded to your office ao that the Finding of No

Signif icant Iapact can be prepared. He believe thie propoeed aotlTltr aeete

th*/ requireaentejf tne generic Endangered Speciee Aot Seotion 7 Coneultetlon

Document. There are/eeeaaan exieting pipeline(a) vithln 500 feet of tbe propoeed

vai looatlon.

vind Shah (OSTS) arvind Shah ( Ezteneloo 289*

Enoloaure

cc:

AShah: : LEX ITTPE: Disk 5

V

A/fWr"5

Chevron ClwvftslJ SA. Inc. PO Boi 61590. Naw Orttws. LA 70161

mm of UM

Cant/el Profit Cenief

April 21, 1992

Structurt Reaoval Request Ship Shoel Block 1S4 fr ^uard Mo. 13. ocs-S.04?Q

U. S . Department of the Interior Minerals Manageaent Service Gulf of hexico OCS Region 1201 Elmwood Park Blvd. Now Orleens, LA 70123-2394

Attention Mr. 0. J . Bourgeois Regional Supervisor Field Oporations

Gentleaen:

Chevro>Vs.A. Production Coapeny hereby rogues

Very truly yours,

R E C E I V E D

APR t 7 1982

0nV# 9f Structure) and Technical Support

lests your epprovel to reaove Ship * 'ves. Details of the proposed

NPB:3B2124

Attachaent

/ V J . C.McDowell LS

PROPOSED OCS PLAT fORM/STRUCTURf REMOVAL

ResBonilplc Pirtv A. Lease Opsrator Naaa Chavron USA Production Coapany

B. Address P. 0. Box 61590

New Orlaans, LA 70161

C. Contact Parson and Telephone Number Maureen Bodron

569-3047

Identification of Structurs to bs Rsaovsd

A. Pletfora Neae Ship Shoel Block 154, WG #13

B. Location (Leese, Arei, Block, and Block Coordinates)

Lease OCS-0420, Ship Shoal Block 154, Lat. 28* 40' 2 7 T 7

Long. 91* 13' 18* W

C. Date Installed (Year) 1968

0. Proposed Dete of Reaovel (Month/Year): July i»92

E. Mater Depth y 64'

Dticrtptlon of Structurt to ot Rawed A. Configuration (Attach a Photograph or e Diagram)

B. Size 29' - 5-5/8" x 29' 5 -5 /9*^ \ ^

C. Nuaber of Logs/Ces1ngs/P1llogs 4 logs, 3 well conductors,

4 pilings

0. Dlaeeter^end Nell Thickness of Legs/Caslngs/PllIngs

Legs - 33* O.D., 7/8" M.T.; Mlliwjs • 30" O.D., 1-1/8" N.T.i

(see attscHod well detail for casing s izes) .

- 2 -

E. Art Pllt i Grouttd? Yti Inside or Outside? OuLrldt

F. Brief description of soil composition end conditlor: Sediments

In the upper ISO' of strete Is es follows:

Sheer Strength QSPth LBS/SO FT Cons, stem v 10' I W very soft 20' 400 soft 40' 600 fine W 700 flrr. 80' 800 firm 100' 1000 stiff 150' 1200 stiff

IV. Purpose

Brief description of the reeson for removing tht structurt:

Tht structurt Is no lr^gtr productive.

v. ftmiYil Plithml

A. Brief description of the eethod to be usod The superstructure

will be bum cut end reeoved. The wells end structure piles

^ will be severed 16' BML with explosi.es, then reeoved

If explosives sre to be used, provide tht following:

1. Kind of Explosives Coe»os1t1on B or C-4

2. Number end Sizes of Cherges 4 - 40-lb charges, 2 • 45-lb

cherges end 1 - 35-lb cherge.

Single Shot or Multlplt Shots? Multiple

If multiple shots, sequence end timing of detonations: The three walls will bt shot In s group shot with a .9

to 1 second delay. The structurt plies will be shot In

a group shot with a .9 to 1 second delay

semer-t

- 3 -

3. Bulk or Shaped Chargt? Bulk

a. Dtpth of Datonatlon Below Hud Lino 16'

b. Inside or OuUid Piling? Inside

C. Prt-Reaoval Monitoring Techniques

1. l i the use of acara charges or ecoustic devices proposed? MO

If yes, provide the following:

a. Nunber and Kind

b. Size of Cherges

c. Brief description of how, where, end when scare cherges or ecoustic devices will be used

2. Mill divers or ecoustic de.* »s be uied to conduct a ore-reaovel survey to detect ,*» ar.ce ef turtles env< aerine aaaaals? Yes, If requester by tr.e m . observer.

If yes, briefly dtsc-ibt the proposed detection oothod

Divers will be sent down to perfora e v1ee.il survey.

D. Post-Reeoval Mon Ite -log Techniques

I. Mill trensduces be used to eeesure the press ire tnd impulse of the detonations? No

2. Mill divers be used te survey the eree utter reaovel to deteraine any effects on aarine life? Yes

VI. Biological Inforoation

If •variable, provide the results of eny recent biological surveys conducted In the vicinity of the structure. If evelleble, describe any recent observations of turtles or eerine aaaaals at the structure site

same*-?

•ITE CLEARANCE VERIFICATION PLAN

Prior to the removel ol Ship 8hoal Stock 154 #13 Structure. Chevron Product ton Compony wiN oonduct e pre-deen up eurvey ee follows:

•A pre-deen up eoner eeerch wit be conducted over e 600' rectue circle centered on Ship Shoot Block 154 #13 Structure* geometric center ueing e 600 kHz tide scan sonar, E. Q. A Q. Model 260. The eurvey grid wil be designed with 67 meter line peeing. The side seen eoner wiN be operated et 75 meter range per otaavsi. > •reels. Cook end Aeeocietee will be performing the eurvey end eel submit a> ~kevfen e map of the eurvey which wtl indude the X end Y ooofdnotoi d any debria found. Upon receipt of this dete. Chevron will soedt bide for deen up. Details of the actual site clearance (e.g. Contractor, equipmant) wHI be tubmttted to your office once e centred hee beon ewerdod bv Chevron

Within 00 deye toNowfng tne removel of Ship Shod Blook 164 011 Structure. Chevron Proo*jction Company eft further verify eite deerence by the tollowing method:

-A 600- radius a ie centered on "A- Struduree' geometric eerier will be trewled. The tra vting veaael jeed wfN be equipped with e ruvigationel system end doner that will t.oduce e red ame track plot of the voted The trawling voted wfN be outfitted at specified in NTL 9O-03. Dotdte of the trewl search (e.g. Contractor, equipmant) wW bo tubmrtted to your office once e centred het been awarded by Chevron

The tollowing intermaeon wd be aubmitted tc ete O^trid Superviaor within 30 deye d completion d find eee deerence ectivitiee:

1. Ode work wee pertormed 2. Signed stetement by the edvager stating that no objects were recovered

or a osocripton of obfecte recovered. 3. Details end results of the eoner eurvey. 4 Detest end results of the fowling eurvey. 6. Letter signed by e Chevron representative tiding thet he/the

eltneieed the arte deerence operationa.

The pre-deen up tide teen eoner aurvey ie scheduled to begin on Mey 17, 1092.

A 48 hour notice wiN be given to the Regionel Supervleor prior to imoiemontdion ol the ebove plen

•

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tat t i t I I I I I I I I I I I I i a a i a a 9 a a

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0 0 0 I I I I I I 1 1 0 I I I I I I I I I I I I

\ 10 75" 0.0 X 40 WT

7* 0 0 * 430' WT

MLW

MUDLINE

CUTOFF POINT (-16 BML)

300' CErtCNT PLUO t l (-) 1 * OMI

LCOfNO

CIIUNT

SHIP SHOAL BLOCK 154 OCS-0420 WELL NO. 13 DEMOLITION DETAIL

CHEVRON PRODUCTION CO OULF Of MIX CO BUSINESS UNIT CENTRAL PROFIT CENTER

SHIP SHOAL BLOCK 154 OCS-0420 WELL NO. 13 DEMOLITION DETAIL Bv MPB |REV 0 DATE 4/13/92

4*

MLW = •

MUOLINE

SO" < 0 X 73* WT

10 73" 0 0 X 40' WT

7" C 0 X 430" WT

300 CEMENT PLUO IL (-) 73" BML

LEOCNO

CEMENT

CHEVRON PRODUCTION CO OULF Op MEXICO BUSINESS UNIT CENTP >PQf iT CENTER

Bv MP jftEv 0 jp>

SHIP SHOAL BLOCK 154 OCS-0420 WELL NO. 14 DEMOLITION DETAIL •AT * * V 9 2

MLW

MUDLINE

30" 0.0 X 75* WT

'0 75" 0 0 X .40' WT

7* 0 0 X 430* WT

CUTOFF POINT (-16 BML)

300' CEMENT PLUO IL (- ) 73' SML

LEOENO

I • 1 CIMENT

SHIP SHOAL BLOCK 154 OCS-0420 WELL NO. 15 DEMOLITION DETAIL

CHEVRON PRODUCTION CO GULF OF MEXICO BUSINESS UNIT CENTRAL PROFIT CENTER

BY MPB IREV 0 I DATF 4/15/92

M • i •

rt

BEST AVAILABLE CCPY

L t

Chevron U.S.A. Inc. PO Boi 61S90. Ntw Orleans. LA 70161

6d at

Carnal fmM D M

April 21, 1992

Structurt Removal Request Ship Shoal Block 154 •D' Structure. PCS-Q-M20

U. S. Department of tht Interior Minerals Management Service Gulf of Moxlco OCS Region 1201 Elmwood Park Blvd. Now Orleens, LA 70123-2394

Attention Mr. 0. J . Bourgeois Regional Supervisor - Field Operations

R E C E I V E O

APR ! 7 1992

Off** of Structural and Tacnntcai Support

Gr»nt n:

Chevron U.S.AT Production Compeny hereby requests your epprovel to remove Ship Shoel Block 1S4 "0" Structure with explosives. Details of the proposed removal method ere ettached for your review.

If you should hsve any questions or require additional Information concerning this request, please call Maureen Bodron at 569-3047.

MPB:362124

Attachment

Very truly yours,

/ h . C.McOowell

PROPOSED QCS PLATFORM/STRUCTURE REMOVAL

I. Rtsponilblc PirtY

A. Lease Operetor Naae Chevron USA Production Company

B. Address P. 0. Box 61S90

Now Orleans, LA 70161

C. Contact Porson and Telephone Nuaber Maureen Bodron

669-3047

I I . Identification of Structure to ba Removed

A. Piatfona Naae Ship Shoel Block 154 "0"

B. Location (Leese, Area, Block, and Block Coc

OCS-0420, Ship Shoal Block 164, Let. 28* 41

Long. 91* 13' S3" W

C. Oate Installed (Yeer) 1957

D. Proposed Date of Removal (Month/Year): July 1992

E. Water Depth 64'

I I I . Description of Structure to be Raaoved

A. Conflr- • • (Attach a Photograph or a Diagram)

B. Slz* 12fT

C. Numbe/ o '.as Ings/PI lings 16 legs, 5 well conductors, V

16 pilings, 8 reinforcement piles

0. Diameter and Well Thickness of Legs/Ces Ings/PI lings

Leg - 26" 0.0.. 3/4" W.T., Leg - 33' O.D., 3/4" W.T.;

Piling - 30" 0.0. 3/4" W.T. end 24% 0.0., 5/B" W.T.

(see attached well detail for casing sizes).

) Leese

N

semer.s

• 2 -

E. Are Piles Grouted? No Inside or Outside?

Brief description of soil composition end condition:

Sediments In tho upper ISO' of strete Is es follows:

Sheer Strength

W 20' 40' 60' 80' 100' !50'

Com IU trie Y very soft 400

600 700 800 1000 1200

soft firm ' l r * firm stiff stiff

IV. Purpose

Brief deicrlptlon of the ree«on for removing the structure:

The structure Is no longer productive.

V. PjiJYll ftjthod

Brief description of the method to be used Tho superstructures

will be bum c*tt end removed. The wells end structure piles

vlll be severoo 16' BPM, with explosives, ther. removed.

B. If explosive; are to be used, provlde^he following:

1. Kind of Explosives Composition B or C-4

2. Nuawer and .Sizes of Charges 16 - 40-lb cherges, 8 • 35-lb

chorees, end 5 - 25-lb cherges.

a. Single Shot or Multiple Shots? Multiple

b. If multiple shots, sequence and timing of detonations: The wells bill be shot f'rst In s group shot with e

.9 to 1 -econd delay. The structure piles will bo

shot «n three series (8 piles per series) with e .9 to

I second delay for eech series.

seieeee.s

3. Bulk or Shaped Charge? Bulk • i

a. Dapth of Datonatlon Below Nud Line !• '

b. Inside or Outside Piling? Inside

C Pre-Removal Nonitoring Techniques

1. Is tho use of scare cherges or ecoustic devices proposed? No

If yes, provide tho following:

e. Nuffiber end Kind

b. Size of Charges

c. Brief description ot bow, where, end when scsro cherges or ecoustic devices will be used

2. Mill divers er ecoustic devices be used to conduct e pr*-rlew rai survey to dotoct presence of turtles and oarIne aassMlsT Yes, 1f requested by tho NNFS observer.

If yes, briefly describe the proposed detection oothod.

Divers will be soot down to perforo e visual survey.

0. Post-Removal Nonitoring Techniques

1. Will transduces be used to measure the pressure end Impulse of tho detonations? Ne

2. Will divers be used to survey the eree efter removel to determine eny effects on merino life? Yes

VI. Biological Information

If available, -»-ov<de the results of eny recent biologicel survtvs conducted in t..e vicinity of the structure. If evellOle, desc< *» er./ recent observetlons of turtles or merino mammals at the ttrucl••»* .Ite.

ssmer.i

SITE CLEARANCE VERIFICATION PLAN

Prior to the removel of Ship Shoel Stock 154 'ty Structure. Chevron Production Compeny * * oonduct a pre cfeeti up eurvey te fotowo:

A prt cieen up eoner eeeroh wfN be certducted over e 1320* redtue ckctt oentored on Ship Shod Stock 184 T r Struct.... geometric center ueing a 600 kHz mow econ toner. E. O. A 0 Model 260. Th. aurvey grid mm be t*eioned witn OTrneterlineeptcmg. Tlie ta*e eoae ootid

°5!!!L0L I S I S ! ! ! : 0 0 0 1 1 T S 0 m o t k % t m " * P * * * * * * • » eurvey mul mm tubrnt to Chevron e mee of the eurvey which wOl Indude the X end V g 0 * * ? ? " * ^ 0 ^ 1 ^ '•••Wof thie dete. Chevron we »ack bid. kx ctoen up. Oofeda of fhe ectuel ake deeranoo (e.g. Contactor, •»*ment) wdl bo aubmlited to your oflice once a contract hee boon ewerdod by Chevron.

Whhm 60 o y i tottowing fhe removel of Ship Shoel Mock 164 I T Structure. Chevron ProAjcbon Company eel further verify aae cleerance by tho tokewtng rnothod:

•A 1320 redtoe circle centered on TT Skuotoree' geometric center wel * • ^ J * l ! ? V * * S l v o a , 0 , •A^WkhJ with a nevkjttiontl eyetem " * P , o d ^ o ^ * f — P** ol the voted. Tne treeing veeed wW be outfitted ae apedfled In NTL 90-03. Detdie d th. trewi eeeroh (04- Contractor, eojdpmont) wtf bo aubmitted to your office once e centred haa boon ewerdod by Chevron

The tollowing intorrnotton wdl be tubmrtted to fhe Otetrtd Supervlec within 30 deye d oemptotde d finel trt. doe/once octMtiet:

1. t Signed etetemer* oy tht tetveger tiding thet no obfecte wore recovered

d a oooortpoon ot obfoctt recovered 3. Oetaaa end reedte d fhe eoner eurvey. 4. Oeteae end reeuNe d the kewtng eurvey. 6. Letter ekjned by a Chevron repreeentetlve tiding thet he/the

ueeiimrj the eke okutrenot oparettone.

The pre-deen up tide econ eoner eurvey ie echeoUed to begin on Mey 16. 1802.

A 40 hour notice wM bo given to the Regionel Supervleor prior to imptomontdion d the ebove pien.

rrr

m

16" O D X 430" WT

10 73 0 0 X .40" WT

•##»«######«#« «#########»»»#

MLW

MUDLINE

CUTOFF POINT (-16 BML)

100 CEMENT PLUO (-) 300 BML

LEGEND

CCMfNT

SHIP SHOAL BLOCK 154 OCS-0420 WELL NO. D-1 DEMOLITION DETAIL

CHEVRON PRODUCTION CO OULF OF MEXICO BUSINESS UNIT CENTRAL PROFIT CENTER

BV MPB IREV 0 I DATE 4/15/92

MLW = t a a 9 a a

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9 a a 9 a a

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400' C CMI NT PLUO M 230' BML

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400' C CMI NT PLUO M 230' BML

10 75' 0 0 X 40" WT t a a aat

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SHIP SHOAL BLOCK 154 OCS-0420 WELL NO. D-2

CHEVRON PRODUCTION CO GULF Of MEXICO BUSINISS UNIT CENTRAL PROFIT CINTIR

DEMOLITION DETAIL BY MPB |RIV 0 | OATE 4/15/92

rrr

16- 0 0 X 43i" WT

10 7 3 - 0 0 X 40" WT

rr MLW

MUOLINE

CUTOfW POINT (-16 BML)

100' CEMf NI Pl I'G (-) 365 BML

LEGEND

CEMENT

SHIP SHOAL BLOCK 154 OCS-0420 WELL NO. D-3 DEMOLITION DETAIL

CHEVRON PRODUCTION CO GULF Of MEXICO BU5INE53 UNIT CENTRAL PROFIT CENTER

SHIP SHOAL BLOCK 154 OCS-0420 WELL NO. D-3 DEMOLITION DETAIL BY MPB |REV 0 DATE 4/15/92

MLW

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16 0.0 X 4 3 f WT

10 75" 0 0. X 40" WT

BBBBBBBBBBBBB BBBBBBBBBBBBB

MI iry JMC

CUTOf* POINT (-16 BML)

-00' CEMCNT PLU6 i-> 500 PM.

LE0CN0

CEMENT

SHIP SHOAL BLOCK 154 OCS-0420 WELL NO. D-4 DEMOLITION DETAIL

CHEVRON PRODUCTION CO OULF OF MEXICO BUSINESS UNIT CENTRAL PROFIT CENTER

BY MPB IREV 0 DATE 4/15/92

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* B B M

9 B M 9 9*

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100' CEMENT PLUO (-) 500' BML

10.75' 0.0 X 40- WT aaa aat

LEGEND

fc ' ' I CEMENT

SHIP SHOAL BLOCK 154 OCS-0420 WELL NO. D-5

CHEVRON PRODUCTION CO GULF OF MEXICO BUSINESS UNIT CENTRAL PROFIT CENTER

DEMOLITION DETAIL BY MP6 JREV 0 |0ATE 4/15/92

sJKJ

ChtTTM U.S.A. Inc PO Boi 61590. Ntw Orleans. LA 70161

Gulf ol

Lamm Profit CMW April 21, 1992

Structure Removal Request Ship Shoel Block 150 !A' Structure. OCS-oe-q

U. S. Departaent of the Interior minerals Menegement Service Gulf of Mexico OCS Region 1201 Elmwood Park Blvd. Mew Orleens, LA 70123-2394

Attention Mr. 0. J . Bourgeois Regional Supervisor - Field Operations

Gentl

RECEIV£o

APR t 7 1992

Orfic* of Structural end TtcfirttcW Support

i :

™ t&.^kffl TZ'^LT* method are attached for your review. U M U I S of the proposed removel

Very truly yours,

C.McDowell

MPB.-3B2124

Attachment

PROPOSED PCS PLATFwWSTRWTl/RS REHC, AL

I. RtiPQnilp.t PirtY

A. Lease Operator Name Chevron USA Production Compeny

B. Address P. 0. Box 61590

New Orleans, LA 70161

C. Contact Person end Telephone Number Maureen Bodron

569-3047

I I . Identification of Structure) to be Removed

A. Platform Neme Ship Shoal Block ISO "A"

B. Location (Lease, Aree, Block, and Block Coordinates)

Lease OCS-0419, Ship Shoal Block ISO, Let. 28* 42' 58" N

Long. 91" 14' 36" W

C. Date Installed (Yeer) 1955

D. Proposed Dete of Removel (Month/Year): July 1992 X»

E. Meter Depth 61'

I I I . Description of Structure |ff ho RaWTtll

A. Conflagration (Attach a Photograph or a Dlegram)

B. Size 48' x 106' v \ ,

C. ^Nueber of Logs/Ces Ings/PI lings 8 legs, 3 well conductors

8 pilings

D. Dl aaeter and Well Thickness of teos/CesIngs/PIlings

Legs - 33" O.D., 1/2" W.T.; Pilings - 30" O.D., 5/8" W.T.

(see attached well detail for casing s izes ) .

semer.i

2 -

E.

F.

Arc Piles Grouted? No Inside or Outside?

Brief description of soil cwtposltlon end condition: Sedle»nt7

In the upper 150' of streta Is as follows: " —

20' 40' 60' 80' 100' 150'

Shear Strength LBS/SQ FT 200 400 600 700

1000 1200

ConiliUncy very soft

soft fine fine fine

stiff stiff

IV. Purpose.

Brief description of tho reason for removing the structure:

The structure is no longer productive. "

V. Bonoeel NjfhfKl

A. Brief description of the oothod to be used The superstructure

vlll bo bum cut end reooved. The wells end structure piles

B.

U l l be severed 16' Btt. with explosives, then reooved.

If explosives ere to be used, provide the follo-Hrg:

1. Kind of Explosives CoeposUlon B or C-4

2. Nueoe.- end Sizes of Charges 8 - 40-ib cherges, 2 - 45-lb

charges, end 1 - 50-lb charge"

Single Shot or Multiple Shots? Multiple

6 Th•^h^ .S 1 l 1 , ^ M ) t S : l f , J U • n f • s , d t 1 , 1 n « o f ««tonet1ons: The three wells will bo ahot In e group shot with e .9

\ t 0 ' "cond delay. The 8 piles will be shot In e group

shot with e .9 to 1 second deley

seme*.*

• 3 -

3. Bulk or Shaped Cherge? Bulk

a. Depth of Detonation Below Mud Line IS'

b. Inside or Outside Piling? Inside

C. Pre-Removel Monitoring Techniques

1. Is the use of scare cherges or ecoustic oevlces proposed?

If yes, provide the following:

e. Number end Kind

b. Size of Charges

c. Brief description of how, wher.. end wr*' »:ar* r» *i s or acoustic devices will be vied

2. Will divers or ecoustic mx.coi bt :«ed tr co- » r t -removal survey to detect prosew cr v tr . r e r * * mammals? Yes, if reouestol by the NKFS ibv^vor

If yes, briefly describe the proposed detect on method

Divers will be sent down to perform a visual survey

D. Post-Removal Monitoring Techniques

1. Mill trensduces be used to measure the pressure end Impulse ef the detonations? No

2. Mill divers be used to survey tho eree efter removel to determine eny effects on marine Ufa? Yes

VI. Biological Information

If available, provide the results of any recent bloloqlcel surveys conducted in the vicinity of the structure. If aval ieble, describe eny recent observations of turtles or merino mammals at the structure sit* .

soit*e#.i

SITE CLEARANCE VERIFICATION PLAN

Prior to tho removal of Ship Shoal Stock 190 aA a Structure. Chevron Production Cc«npeny wd conduct a pro-clean up eurvey ee tokows:

A pre-deen up eoner eeeroh wtf be conducted over e 1320' redkie circle centered on Ship Shoel block 190 "A" Sto jcturee' gaometrc center ueing e 500 kHz tido ican eoner. E Q. A Q. Model 290. Tho eurvey grid wtl bo designed with 67 meter line tpactng The side econ soner will bo cpereted et 75 meter range per channel Kineela Cook end Associetee wtf be performing the eurvey end wtf submit o Chevron a map of the eurvey which wtf include the X ond V coorcanotte of ony debrie found. Upon receipt of thtf dote. Chevron mm aoee* btde for cason up. Dotsda ol the actual aba ctsoyonce (e.g. Contractor, equipmant) wtf bo eubmkted to your offioe onoe e contract hae boon ewerdod by Chevron.

Wilhin 90 deye tokowing the removel of Ship Shoal Block 190 "A" Structure. Chevron Products Company will further verify eke deerence by the following method:

•A 1320* radkia okoie centered on "A" Structuree' geometric corner will be trewted. Tho toowbng vessel ueed wtf bo eoptppod wkh a nevigatlonel system and plots* thot wtf produc* e reel time keck plot of the vessel. Tho trewtong veeeci wtl bo outfitted ee speckled in NTL 90-03. Deteilt of the trewt search (eg Contractor, oqutpmont) wtf be submitted to your office once e contract hae been ewerdod by Chevron.

The following information wel be submitted to tho Dtflrtct Suporvisor within 30 deys of completion of Hnel ake clearanca ecevteee:

1. Ooto work wes performed 2. Signed statement by the salvager eteling that no objecte wore recovered

or a rjeecripkon of objects recovered. 3. Details end results of the eoner eurvey. 4. Detent and reeulle of the kewting survey. 5. Letter signed by e Chevron repreeentatrve titling thet he/she

wttnetted the ske deerence oporatfona

The pre-clean up tide econ eonai survey ie scheduled to begin on Mey 17. 1992.

A 49 hour notic* yiN be given to the Regional Supervitor prior to implementation of the above pien.

MLW s r

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mmm i mm mM 1 mm

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^ 4 " 0 0 X 373" WT

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t 0 0 0 10 0 0 10 0 0 10 0 0 10 0 0 10 0 0 10 0 0 10 0 0 10 0 0 10 0 0 10 0 0 10 0 0 10 0 0

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200 CEMENT PLUO EL (-) 100 9ML

^20 ' 0 0 X 43 i " WT

: : : : ! ii LEOENO

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^ 13 373" 0 0 X 43' WT

::: :

9 62 0 0 X 472 - WT

SHIP SHOAL BLOCK 150 OCS-0419 WELL NO. A-2

CHEVRON PRODUCTION CO. OULF OF MEXICO 9U5INCSS UNIT CENTRAL PROFIT CENTER

DEMOLITION DETAIL BY MPB |REV 0 | OATE 4/15/92

•« KJ

rrr

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30* 0.0 X 73* WT

16* 0 0 X 430* WT

10.75" 0 0 X 40* WT

3 5* O O X 20" WT

MLW

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JI

MUDLINE

CUTOFF POINT (-16 Or*.)

200- CCME NT PLUO EL( - )130 BML

LEOZNO

CEMENT

SHIP SHOAL BLOCK 150 OCS-0419 WELL NO. A-3 DEMOLITION DETAIL

CHEVRON PRODUCTION CO OULF OF MEXICO BUSINESS UNIT CENTRAL PROFIT CENTER

OV MPO IREV 0 I DATE 4/15/92

TTT

30" O.D X 73" WT

16' 0 0 X 43i" WT

10 / 3 0 0 X 40" WT

3 3 0 0 X 20' WT

I I I ! 1 1 1 !

f f f f f f f f

MLW

rrr

MUDLINE

CUTOT POINT (-16 BML)

200 CEMENT PLUO EL (-) 130 BML

LEOENO

E2 CEMENT

SHIP SHOAL BLOCK 150 OCS-0419 WELL NO. A-6 DEMOLITION DETAIL

CHEVRON PRODUCTION CO GULF OF MEXICO BUSINESS UNIT CENTRAL PROFI" CENTER

BY MPB IREV C I DATF 4/13/92

APPENDIX B

NMFS CORRESPONDENCE

UAJiTIO t T A T * § O ' P - a f - V E M T 0> COM(V»cac | fUe'ianel Ocaar.ic and a««n«aehaf i* A d * « at rat an . ^ a j T • ! Not tenet O c i i h i c and At>*<ato*ar>c A d *

" • • i . # i

JUL 2 5 553

Hr. wuiian 0. Asttsnbora Oirsctor Minerals Menegeaent Service U.S. Departasnt of thi Interior Washington, D.C. 20240

Dear Mr. Bettenberg:

Cncloead ia the Biological Opinion prepared hy tha Netlonel Marine Pieheriee Service (NMPS) pureuent te Seetion 7 of tha Cndangeres Speciee Act (ESA) concerning potentiel iepacta on endanoered end threetened opeeleo eeeocieted with reeovel of carte in oil end gee pletforae end releted atructuraa ln tho Oulf of Mexico (OOM) ueing eaploeivee.

Thie "etenderd" coneultetlon covers only theee reeovel oparationa thet eeet epeelfled erlterle pertelning te the else of exploeive charga uood, detonetlon depth, end number of blaete par atructurel grouping. Coneultetlon auat be initiated en e ceee-by-ceee baais fer e l l diaaentling operetione requiring the uoe of exploeivee thet do not eeet the eetebllehed erltorio.

NMPS concludoe thet etructure removele in the OOM thet f e l l within the eetobllahed erlterle ore not likely to jooperdlae the continued exletonee ef llotod opeeleo under the jurisdiction of NMPS. Howsvst, i t le our opinion that; the propoood ectivitiee mey rooult ln tho Injury or mortality of andangarad end threetened eee turtlee. Therefore, pureuent te Section 7(b)(4) of tho SSA, we have eetebllehed a lew level ef Incidental teke. which le eueuletlve fer e l l reeovel a covered by this conaultatlon, and terae end eonditione neeeeeery te minimise ond eon iter eny impecte, eheuld they occur. The terae and conditione ero oonteinod in ti eneloeed lneidentel teke eteteaent. Alao eneloeed le o Hot of pending coneultetione that eeet, with noted exceptlb.no, the erlterle ootebllohod ln tha "etenderd" ooneultetion. Thio biological opinion end the mitigating eeeeuree end terae end conditione eontelned ln the related incidentel teke eteteeent epply te theee propoood rsmoval operetione. Therefore, forael eoneultotion ie concluded for these propoeed ectlone.

:

*' Stiff b.aiiaf Affff » Prc t'ctt • 'fM*> )9S% j

Car.^ultstion iust b* r*L;-it itstsd i f : u »>- . of t«mtfcj spocifUd in th . incidents! t sk i ! , ! • B o u n t

4

o r

«*cosd .d : i j n.w tnforaeclin revSai. i ^ I c J . ' J I ! l * • c t . v l t i . . th.t *sy . f f . c t l isted s w i l s ^ n " . L ^ * P«POoed • *tr»"»t n-t conndsrsd thus fsr in «EJ * " n r # r or to an I d e n t i f y * ac t iv i t i e s srS eodTfiad i J J P * 1 - 4 0 " * ' ( » ths edvoree effect to l i l t l d s p s c ' i i ^ c i e l / ? n n # f t h " c * u " §

(4) s nsw specie, l l S n ! i d ! r # ' ths t asy bs affsctsd by ths project h * b i t * « deoiq.is-.sd

I look forward to your contlnusd c o o p e r a t e <- . . . . consultstions. eoopsrstion ln futurs

s lncsrely.

lass w. trsnnsn ••istant Adalnlstrstor for Fiohorioo

enclosures

Biological Opinion

Agency: Minorals Manaqaaa.it Sarvica, U.S. Oeosrtasnt of tha intarior ¥ **«-»n*

Act iv i ty - f j ^ l j f f i o n for Roaoval of Cartaln Outar Continental Sholf Oil and Caa structures in tho Oulf of Moxlco

Conaultatlon Conducted Oy: Nstlonsl Msrins Fisheries Ssrvlcs (MMPS)

Data Iaauad: _____m

I

Background Inforaation:

Xn a lot tor datad Noveaber I t , 19SS, tho Minsrale Msnsqsaent service (MMS) aads an l n i t i s l rsqusst far forasl consultation purauant to Soctlon 7 of tho Endangered Spec lae Act (ISA) for tho removsl of on offshore e l l and gae pletfora leeeted in the Pederel watere of the Oulf ef Mexlee (OOM). MMS end rrMPS deteralned that reaoval ef o i l end eoo platforms 1 rslstsd etruetureo in the OOM asy sffeet endengered end tl. estsnsd aerine apeciee. Thio -eey effeet" determination vee beeed on e poeeible rolationehlp between endangerad and threatened aaa turtle aortal l t lee and the dleaentl lnq ef platforaa ualng explooivee. On Moveaber 25, 19S«, MMPS ieeued the flret of e eerleo of bioloqieel opinione eddreoelnq, in detail, the potentiel lepecte to lieted aerine epeelee thet aey oeeur aa e reeult ef OCS acandonaant ectivltlee.

MMS end MMFS oetebl lehed proceduree fer expediiinq Section 7 coneultetione on platfora abandonment ectiviciaa ln the OOM referred to aa "expedited eeneul tot lone." Following thooo proceduree, epproximetely ae consultations hsve been eoapleted for reaovel operatione ln the OOM reqion. All ef the coneultetione heve concluded thot tho propoeed ebendonaent activitiee wero net likely to jeopardise the continued exletence of any lieted apeciee, but that the propoaad ectivitiee aay reault ln tho incidentel taklnq ef endengered snd thrsstsnod sss turtlee.

r . • d i oaa r.r. ias and n i i t t d atructuree ueir.o **P*osivss • »»oint where • "atandard" ara total ~a-'« •atebl ieh . . r reeovel c p « ; . t i o n s reccing cartain Cri tor ia 5ased upon raaoval tschniquss aavalopod and reviewed in* con*unction vith tha pravioualy eonduetod "sxpedited rsnsultet ions," HMS haa requeatad, by lat tar of May 24, 191a . "generic consultation" that would ba applicable to a l l future/ reroval operet:ons that f a l l within a diatlnct cataqory de fred by apae i f ic paraaatara. A cataqory haa baan doalgnad to include thoaa atructura typaa and raaoval techniquee aoat coa.ior.ly encountarad durlnq tha expedited conaultationa and dleaentli-a operations elreedy completed. Since approximately 1000 structuree thet aey be scheduled for future removel f e l l within the paraaetara of the eetabliahed category, MMPS agree, that a "generic" conaultatlon le eppropriete a thie time, rhe object ive of the coneultetlon le to reduce the edainlscretlve burden on both MMS end NMPS fer conducting repetitive coneultetions on e c t i v l t l e e thet eey reeult ln e i e i l er iapacta to l i e t e d epecloe end thet require Identical mitigating eeeeuree to maintain adequate protection for ouch opeeleo. Thio b io log ica l opinion reeponda to MMS' Mey ae, l t t t , conaultatlon requeet. The opinion le beeed on the beet ee lent l f lc and commercial dote preeently evelleble end ineerporetoe lnforaetlon froat 1) previoue MMS Summery Evaluatlona, 2) previoue NMPS bio log ica l opinione on pletfora reeovel, 3) the eclontlf lo l i t e r a t u r e , and 4) other pertinent end evelleble information. Coneultetlon euet be re ln i t i e t ed l f new information beeeeaa eve l l eb le concerning Impacta to l ieted epeciee thet would elter the eonclueione reeched in thie opinion er require eodificetior. of the meeeuree ident i f ied ln tho etteched Incidentel teke atateaent. Conaultatlon w i l l continue on o eaae-by-ceoe baaie for thoae etructure reaovala that do not aeet tho c r i t e r i a eetebllehed for "etenderd" reaovele.

Deecription ->t Propoeed Aetion:

The propoeed ectlon lnvelvee the reaovel, by exploeive aeene, ef offehore e l l and gee etruetureo loceted ln Pederel wetere ln tho Gulf of Mexico. Reaovel of tho etructuree w i l l be accompl lehed by aeverlnq the support p l l i r <«, oeleeons, well conductore, e tc . , us lnq very ing amounta et evr wee te peralt eelvege ef the s tructuree . Thio Jnvol e» * laceaent ef explooivee ineide or outaide of eupport i r ' * and detonating chargee prieer i ly utmg electronleell:- - »'M" signals.

This "generic" eeneulcat • -naldere only thoee reeovel operetione thet eeet eena . t . cr i ter ie pertelning te the else of the exploeive cherg* ueed. devonetlon depthe, ond nuaber of bleete per atructurel grouping. The epeeific er l t er l e eetebllehed to cover such reaovolo are ee follows:

( •00 a i l l l e c c o n d a ) . w ™ " e i an i n t e r v a l of 0.9 seconds

a e e i a e n ^ r r a c . " ^ ^ . c I & p ^ 1 ? ' ^ ^ - < h «

•ec ied* .* pa^uia.? " ° U n t ° f • « * 1 " i v " - t o n . t l o n la not to

Spaciaa Occurring In tha Projact Areas

Liatad spsciss undar tha jur isdict ion of tha proj oat aroa: HMFS that aay occur in

CQHMQH HeVfT

r i g h t vhala

finback whala

humpback whala

aol whala

apora whala

groan turtlo

Keap'e rldlay t u r t l o

leetherbaek t u r t l e

loggerhead t u r t l e

hewkebill t u r t l e

aCIEMTiriCT NnhT

CVlbSlSSm a lea l e l t e ,

N l i S n Q P t S r j ahva i lua

hagiwtsrs •«na. B an > 1

IfiaaoeaWk^n boreal t f

rhve«,fc«i» eo^pdoj)

Chtlftnls

STATUS L i e r a p

E •/J/70

E i/a/7o

E s/a/70

E •/a/70

E s/a/7o

Th is 7/ai/7i

E ia/a/7o

E s/a/7o

Th 7/2S/7S

E s/a/70

! i X 1 ? f U 1 , a r # # n popuietiono ere llotod oe

u:;:5 .M.s.ree?# nor4^ K S d i n f

? ! L C l i I i C ' 1 h * b l t a t b " r *««l«nated in the pro-ect area for tr.e above epeclaa. r * «ree r - r

epec Aaaeaaaent of Iapects:

l e ^ J S e . I ! * * ; i ! f 4 " * i <*oveaber as. 1916 and rebrui ii* lt!2i 11: . 5 •» .truc^.;^;;;.' COM. Accounts ef endengered end threetened speelee which occur in the project srss. end ths "Aeeeeeeent of Iepacta" eentelned in theee prior oplnlone eleo spply to thie conultstlon snd srs incerporeted by reference. Xn euaaery, ths opinions referenc-d sbove scknovl dgs tho existence of - poeeible reletionehlp between the uoo of undervstsr • "sivae ln reeovlng pletforae snd rslstsd »true*"irss uis c currsncs of otrondod eee turtlee, aerine eesuaelo (Xj , ^ ,n ;atua) and fieh. United oiraeriaento conducted b, ft.' .lveoton Laboratory eenflra thet eee turtleo (and other e*r,. v.rtebretee) found ln prealaity to petrolaue pletforae cen be injured er killed by reaovel operetione sep*eying underveter eaploeivee (Riles, l f f f ) .

.echnology seat coaaonly U'JS , ln the dleaentl ing of platforaa includes: bulk eaploeivee, ehaped exploeive chair \ aechenlcel and ear es ive cuttero ond underweter are euttere. e uoe ef bulk exploeivee hee become the induetry'e etenderd procedure for eevering pi:Inge, well conductore and related eupportmg otructuree (e^rox. to* uee). when ualng bulk ehargee, the inaide ef tho atructure een be etted out te et least l f feet belov the eediaent fleer te ollow placement ef explooivee lneio^ of the etructure, rooult ing ln o deereeee ln the Iapulee end preeeure forcee releeeed Into the water eoluaan upon dotonetion. The uoe of high velocity eheped chsrgee le reported te heve eoee edvantagee over bulk exploeivee end bee been ueed ln eeablnetion with eaeller bulk chargee. The cutting action obtained by e shaped charge lo aeeeaapllehed by focusing the oaploolvo energy w.th a eonieel aetellle l iner, A aejer advantage eeeocieted with uae of high veloeity eheped ehargee le thet e eaeller eaount of «*?.oeive charge le required to eever the etructure, which alao

- i te in reduetlons in the iapulee end preeeure foroee releeeed the weter eoluan. Uee of aechanleel cuttero end underveter

- cuttere ie eueeeoeful in eoae elreuaeteneee end de not Freduce the lepulee end preeeure fercee eeeocieted with detonetion of explooivee. however, theee methode oro, tn aeet Irstencee, aore "ino cone ua ing, costly and aero heiardoue to divere. Ae e reeult. thooo eethode e-e not uaed on e routine beeie (MMS Report on Pletfera Reaevel kschnlq ee).

Based upon dots obtainad during previously conductad "expediter--oreultetione on pletfora reaovala, the fallowing le a ccrpariion if tno typee of oxplcsivce aoet Ukaly to Oe ueed in t-.e orcaceei reaoval oporationet r—««•

UBlOelYt Ba,t Qn^tl w a " g l ^ t t y Brieanc**

*3* approa. e,199 a/eac. l ) 5

C*« epproa e.ooi a/eec. i.13

<"aap.-B epproa. 7,tOJ a/aac. x # 32

• Brieence 4d the eeeeurc ef ohetterlng powor 00 coopered to THT -hich hee brieence of l.00. (KMJ Beport en Pletfora Benoval Techniquee, 1999.)

The propoeed reeoval operetione will be eeeeeellehed ueing high veloeity exploalvea. Oee ef thie type ef exploaiva charge ehould oiniBlee the durotion ef the iapulee end preeeure fereee produced by detonetien ef the ohergee, while providing the eaount of foree required to eever the • ructuree. According te KMJ, roetrlctlng the grouping ef detener e te eight Individual bleete per group and etaggerlng bleete b, ?.f eeconde (900 al l 1 ieeconde) will elnlalte the eree offooted by the bleote ind euppreee phcelng of shock wevee, thereby decreesing the euauletlve effeeto ef the bloett. Zn addition, since e l l detonetione will oeeur at leeet i ' feet below the eedlaant eurfece end ne aero then to pounde ef eapleeivee per bleet will be peralt ted, tho eaount of residual energy releeeed Into the aerine environaent eheuld be redueed clgnifleently. Ae a reeult, MMPt bellevee thet alnlael ehock tnd lap-lee fereee will bo releeeed in the vicinity ef reaevel •poretlone et eny given tiaa.

To date, ef epprealaetely 44 previouely eonduetod oenoultatlens covering ebendoaaoat oetlvitleo, about i i etruetura reaovele hove been eoapleted. Booh reaovel operetion woo eon ito red by MMPB oboervero ead aaa eenoaoted ueing eppropriete alt laeting aeeeuree. At the prtpebt tlaa, eight turtlee aave been eighted ln ereeo neer etruetureo being 41 seen tied, et laaat two ef whieh wore green turtlee. Of the eight deeuaoncod sightInge, ene turtlo wee reported to be fleeting en lt'e beak neer e pletfera efter detonetion ef ohergee, eepereatly etunned er injured. Me ether incldonte ef eoo turtlo injury er aortelity have been reported. Therefore, MMPt bellevee thet the propeeed eetlone ere nat likely to reeult ln significant adveree lapeote to endengered and threetened eoo turtle aepulotiene.

Conclusions:

Bassd on ths above, i t ls our opinion thst « M #

• no rslstsd structures in tho GO* U not l i k l l J i i ? L S i r 5 f ! r - I . continuod sxlstsncs of thrsstsnsd snd sndsnoSrsd L l J ? ! ! t h * th. Jurisdiction of MMPB. Hev.v i r w , ^ \ r ^ ^ propossd activlt ss osy rssulc in ths I n l u r / o r ^ r ^ ^ S f ; ^ g . r h . , d K«p', ridioy, ajrs.n, h.wkohtii .JS Uslhsrbiek turtloo. Thsrsfore, pursuant to Section I tmul . I t 211 JSJ hsvs sstsblishsd s loTlovol of iiwidontol tolU snd ImlA i J * * condition, na.aa.ary to s l n l . l t . s n d ^ t o r ^ i . i r *

» ^ rp t; . o. . 1^ ^ -Auiuty B.lnl t i . t lon of Conoultotion:

conaultstion nuot ho rolnitlotod lft l) tho snount or «#

• ^ ^ i i V L " " 4 n f w o o l s ltw^ets « t** prslsJJ thst M y f £ # # ^ J 1 # t € 4 Mooiss in o ssnnor sTto on sartont^t ^ J t 2 ^ . l n • » 4 " i « * ' » **• i o > » n l f l s r s o ? l ^ i i i T s r s modified In s sannsr thot c.usss on sdvsrss effeet on listsd spsciss not prsvlously considsrsd; or 4) . now spiels . I s U s t s d

•••ifnoted thot nsy s« e r r e c ^ i j tho**

INCIDENTAL TAXI STATEMENT

Section 7(b)(4) of th* Endenqsred Spool*** Aot requlree thot when s proposed sgsncy sctlon Is found to ho conolotont with Section ?(s)<2) of the Act snd tho propoood sctions soy incidsntslly tsks individuals of listsd species, MMPS will iesus s ststsasnt thst specifies tha iapact (eaount or eatent) ef euch lncidentsl taking. Incidsntal teking by the Pederol agency er applicant that coaplleo vith the specified terae snd conditiono of this ststsaent lo suthorised end ex sept free the taking prohibitions of the ISA.

eased en stranding racorda, lneidentel capturee eboerd coaaorciel shriap veeoale and historical dote, five species of eee turtlee ere known te occur ln northern Oulf ef Mealee aatero. Current evelleble lnforaetlon en the reletlenehlp between eee turtle aortelity snd the uee ef high-velocity eapleeivee te reaove ell pletforae lndicetoe thet Injury snd/or death ef ees turtlee aey reeult fraa the prepeeed setlono. Therefore, pureuent te Seetion 7(b) (4) ef the ISA, an lneidentel take (by Injury er aortelity) level ef ene docunented keep's ridley, green, hawksbill er leotherbeck turtle or ten loggerheed turtlee lo set fer s l l rsaovsl oporotiono conducted under the teraa snd conditions ef thie lneidental teke eteteeent tae level ef taking epeelfled here le euauletlve fer ell reaovolo eevered by thie eoneultotion. If the incidentel take aeete er eaeeeds thie epeelfled level, MMS auet reinitiate eeneultetlen. Tho •outheeet legion, MMFS, will cooperate with MMS ln the review ef the Incident te deteraine the need fer developing further eltlgetlon aeeeures.

The reeeonoble end prudent aeoouroo that KMPS bel loves srs r.ecesssry to alnlalse the lapect ef lneidentel askings hsvs been diecueeed with MMS end will be Incorporated ln the reaovel deolgn fer "etenderd" structurs reaovele. taa folloving terae end eonditione ore eetebllehed for these reaovsls te leplsesnt ths identified eltlgetlon aeaeureo and to docuaent the lneidentel teke eheuld euch taka occur i

1) Quel lf led eboorver(o), ee epproved by IMPS, aust be used te aonitor the eree around the sits prler ta, during end efter detonetien ef ehargee. Observer coverage v l l l begin 4S hours prler te detonetien af chsrgee. Xf sas turtloo sre obeerved in the vicinity ef the pletfera end thought te be roe ident ot tho elte, pre- snd poet -detonat isn diver eurveye aaat ae conducted.

7

2) On days that blaating oparationa occur, a )C-sunute tan*, a-rvey muat ba conducted within ona hour before and ona no-r aftar aach blaatlng apiaoda. Tha KNFI-approved oboarv«r and/or •.Mrs on-eite paraonnal (KMFS astployaa only) auat ba uaad to check for tha praaanca of turtlaa and, l f poaaible, to .ientify epeclaa. Xf weather conditiono (fog, oxcooolvo winds, etc.) aake it lapoeeible te conduct aerial aurveya, blaatlng activitiaa rey be allowed to proceed i f approved by the KMPS and/or MMS pereennel on-eite.

3) I f ooo turtloo ore obeerved ln the vicinity of the platforn (within 1000 yarda of tho alto) prior to detonating chargao, bleeting will bo delayed until attaapta aro oueceaaful ln removing thea at leeet 1000 yordo froa tho bleat olto. The aerial aurvey auet bo repeeted prior to reeueing detonation of chargee.

4) Detonation of exploelvea will oeeur ne eeenor thon 1 hour following ounrlae and ne later then 1 hour prler to ouneet. However, I f lt lo deteralned by MMPS end/or MMS on-elte peroonnel thet epeclel eireuaotancoe juetlfy e aediflcetlen ef thooo tlae reetr let lone end thet euoh aodifleetlon le nat likely te adverealy lepect llotod apeciee, bleoting aey be ellowed to proceed outaida of thie tlaa frame.

5) During el l diving operatione (working dlvee eo required ln tho couree ef the reeovele), divere will be inetrueted te oeen the eueourfeee ereee aurroundlng tae pletfera (bleeting) oltoo ior turtlee end eerine meaaelo. Any elghtlnge auot be reported te the MMPS er NMS on-eite pereonnel. Open coapletlen ef bleeting], dlvore euet report and ottoapt to recover eny eight ed Injured er deed oee turtlee er aerine aaaeale.

4) ehargee auot be ataggarad O.f aeconda (000 alllloooondo) for each group of etructuree, to ainiaise the cuauletlve effecte of tha bleete. Xf s reaovel aparetlaa lnvelvee sniltlpi* group inga ef etructuree, the lntervel between detonetlon ef chereee far eeeh group ehould be aln lei aod ta avoid the •chuaalng* effeet. Whenever euch intervale oaeeed to-ainutee, the eerie l eurvey euet be repeated.

?) Tha uaa ef eoere ehargee eheuld be evelded te alnlalse the •chuaaing effeet." Uoo ef eeare chargee aey be elloved only l f epproved by the NMPS and/or NMS on-eite paraonnal.

• ) A report auaaerliing the reoulto ef the reaevel end eltlgetlon aeeeuree auot be aubaltted te the MMJ Gulf of Mexloo Region within 11 working deye ef the reaevel. A copy ef th* report auot be forwarded te KMPS, Boutheeet Peg ion.

ThU incid.nt.i t .k. I t l t M I M . p p i u . only to .nd.ng.r.d «nd thr..tonod ooo turtloo. Xn ord.r to o l l o / . n lncld.nt!i t . 2 . af • o . r i n . noml . p . c l . . . th . t.k Inf oust ho .uthorii.d und!? S.etion 101(.)(•> of tho N.rlno M . M . i Protection Act off i t ' i Although lnt .r . . t h«. boon «xpr. . . .d ln obt.lnine an .xc.otian . u thor I j ing . H.ited eke eff dolphlno InoldonilT to Ibendenne^t •ct iv l t iee , no n.rIno OOJOMI toko lo authorised until .pprop?i.t. .no i l t . k . rogul.tlono oro in ploeo ond rolotod •Uttereoff Authorit.tion- .ro ioouod. uttoro or

t

REFERENCES

Caillouet, C.V., A.M. Landry. M.J. Duronalet, t.A. Memella. C.T. Fontaine, O.t. tavara, R.L. Xndeliceto, T.D. willlaas. and D. Forcucel, lttt. Prel la I nary Evaluation ef tiologicsl Zapacta of Undsrvrtsr Expl oa lona Aaaoc latad with Raaeval of an Oil Field Structure Froe tha Oulf of Mealeo Near Crystal Beach, Tenes. Nstionel Marine Fiaheriaa tervico. Southeast Fiaheriee Cantar, Calvaaton Laboratory l i PP*

Duronelet, M.J.. CM. Caillouet, t. Mensella, R.M. Xndeliceto, C.T. Fontelne, O.t. Revere. T. will laaa end D. eoee. IttS. Tha Effecta of en Underweter Explosion en the Turtloe L^aieoenaiw, kiBci and earatte aaratt* vith Obeervetion ef tf feeta on othar Marine Orgenless. Unpubl lehed Trip Report - Removsl of Tenneco Oil Fletfore on June Sl . l ttt . MMPt. fEFC, Oelveeten L oratory. It pp.

Fontaine', C.T., l t t t . Obeervatione en the Reeoval cf Tennoce Oil Pletforn 4tS*l. Moot cacron Fiold, 20-11 July Itte. unpublished Trip Raport te NMFS, SEFC, Oelveeton Lsborstory • PP-

Rliee, I . F . , l ttt . eummsry Report en tloiogicei Xepecte of Offehore Petroleum Fletfore tevoronee Ueliwj tvpleelveo. Unpubllehed Report te NMTS, OtPC, Oelveeten 1 moratory lt pr

Minerele Menageeent tervico. l t t t . Platforn Reeoval Techniques Unpublished Rsport. MMS Oulf ef Mealee esq lon, 14 pp.

Nstionel Merino Fieheriee tervlee, l t t t . Slologleel Opinion Concerning ispecte ef Prepeeed Rsaovsl ef Cltlee torvieoe oil snd Oss corporations offehore Pletforn 1-1, Locsted ln celveeton Ilock 144. Oulf ef Mealee. 14 pp.

National Merino Fieheriee tervlee, l f t ? . lloloejleal opinion concerning Prepeeed Reeoval ef Pennsoll Conpcny'e Pletforn A, Loceted ln Vermillion ilock t i t , iulf ef Mealee. 14 pp.

Renaud, M. endC. Oit sch leg. H I T . study of liologlcel Xepecte ef the lapleslvs Reaovsl af sn Offehore Pletfera (Pennsoll Pls t f era •veralll len HOA). Unpubllehed Trip eeeort to NMFS. SEFC, Celveeton Lsborstory. tpp.

10

1 • l o c k atructura

40 Nobll Explorat ion and Producinq Cot m

apeny U . S . I n c . vaxml l lon 1

234 A 101 1

41 Kerr-McCae orporat ion sn ip Shoal SOS A

42 Conoco I n c . •

• h i p Shoel Vormll lon

100 A SAI A

42 Nobll Explorat ion and PT odocinf cox a

apeny O.O. a

111 1 101 C

44 Tannaco O i l Kxplorat ion and Prionot t i e . •net r s ISO P

43* Nobll Explorat ion and Pr

Ixcapt rappai aunt p in

oduclnq COM

a l i o d v o l i n

apeny U.O. law.

( h e l i p o r t ) •AY* 0 • » • im Pa

V m l ' l M • enalllexa 70-Q

110 C 70 •

• a

40 Mobil Kxplorat ion aaal Pr oduclng Cnnpany 0 . 0 . I n o . V o r a l l l o n 70 1

4t 8 apart en 011 Corporat ion Celveeton 141 A

40 Conoco Inc . • ••

Grand I s l e • e

01 A 3d 1 47 S

40 Nobll l a p l o r a t l o n and Pn a due lnaj Coa atony o . l . I n c . Main Peon t l 1

30 Nobll Kxplorat ion and Producing Coaapany U . S . I n c . South Polto 12 0

S l Union Coepany • Vent Dolto B)

30 3

• * • m

a* nj

31 1 * V

S2 rono. o Inr . W t m m t Delta 43 M-l

tiobil exploration and Producinq Conpany 0 . 8 . I n c . • Soutb Mnrnh

71

ass A •

54 Tenneco o i l Explorat ion and ProdoctIon Skip Banal IPS Bj

54* Conoco Inc . • • S MarnnT'eK nd

ISS 47

141

A 0 A

57* Exxon Conpany U . S . A . Except Rina I n l a n d Bant nexeitiexe aJdS-A

Mlqn E n . , B . ad A-J42 B

Sm BMP Patroloun •lejb Inland A-507 A

55 Mobil Exploration ond Producinq r nop eny O.B . leas. snot reoesi I S S

44) PMP Opnratini Coaapany Onnt Caaaaron 444 A

41 Aaoco Production Conpeny 8 . Baton Inland 11 A

• Consultation, whoae nunbera include en eaterlak (a) did not totally fal l lender taa perenetere of thin "atandard • coneultetlon, therefore, only taooe reaaovcle neat lnq tna paranatara are approved and farther conaultatlon will be neceaaary tnr the aae apt lone.