STATE OF**r~'T"_A_U**

l":> F' f-- I C f:::: 0 F' THE G 0 V E 1"< N 0 F<

SAL.T l_AKE CITY

84114



### December 28, 1978

Mr. Alan Merson Regional Administrator

Environmental Protection Agency Region VIII Suite 103

1860 Lincoln Street

Denver, CO 80295

Dear Mr. Merson:

Enclosed with this letter is the Revised Utah State Implementation

Plan (SIP). Nine additional copies of the plan and regulations have been

forwarded to Mr. Marius Gedgaudas of your staff for distribution as

. necessary for the EPA review; five technical support documents will be

forwarded to Mr. Gedgaudas before January 15, 1979.

It is felt that the revised SIP eliminates the need for the EPA regulations promulgated as replacements for portions of the original Utah

SIP which EPA considered inadequate in attaining the National Ambient Air

Quality Standards. Consequently, with exception of 40 CFR 52.2345, revocation of 40 CFR Subpart TT is requested. We will prepare another

revision to the SIP within the next several months to acquire control of

the prevention of significant deterioration of air quality program and

will ask for revocation of 40 CFR 52.2345.

The revised SIP demonstrates attainment of the secondary NAAQS throughout the particulate non-attainment area excepting in small areas

near the Kennecott tailings dump in Salt Lake County and the USS Geneva

Works in Utah County. As permitted under Section 110, Clean Air Act as amended August 1977, Utah requests an eighteen month extension until

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r**!YXpo~JI~l~1nterlanc!:~~Ca!1!1less.; .ratf~i:**  

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, 10n 4.;**.;a.~wtll'const1ttite';a,7Yio1atfon** of:.these. RegulatiODS.**~.** , \**~:~** ..**:~** .**·~~:;'~~~'",~~ii{:·.:~"7~;~(::<~:~;:~~;~:·** t.,.:.: . '**,,:~er:~.~,:~operat:or.~,0f;*~1,1'nstallatio~** suffering 

### an unnoid.lC**reakdOlf!J,;~:f.;,'equ1JD!nt:or~>p~u~1,** errors shall'assure that pro<:;.:, eration andlor.;activ1:ties,.are, an-tail ed,suchthatemissfons frc:r.!

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## do 'not ',eXceed the dfe-:**(2pac;tty}0~~~~~,!c~1ona1:;poJ1ution** control;.equip:lent.::. In the e

.. ;·**"that·product1on.~operat1on:and/oriactivitiescannot.be'curta1led ~'** **':jeOparg#.f~·~equipr.en~':oris~fetj·inthe~installat.ion** or:the operat'

'of;J"elated**:,jnstal1atiof!s~or..ifaci1it1es,and** . there, are no other f"NS, '**·v~.na~l.~t~ttiijJ_~tiVes~th~~~er.::oi<operatrir:of:the** source shall**~, tJte~DO::;t;;ra2,id,"~practical'procedure'**  The**~e'** to reduce**e!'Iissfons~',** ..**.ts:ope.ratoriof,;,~nY;i.~stal1atfonsubje~** to 'an.**SI~:emission** 1 taitJ**ut1~~~~~~~eiRegu1a1;1.0~·~shall~~** ;deemed to',have canpl1ej**lIft~· ~lP.rov,**  sions' of',1S ion' :i1

... he emission..1Jmitation has**,~t ~,**  

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n;,accordance With. Sectfon',110(a)(6), Clean Air**.~ct** as ar.lended

,,_**l~{7.;~owners .or~~~per~torsmaynottesnporari1y·reduce**  the pay of any**~'** by;;reason.of.**~e** useof:a supplemental' .or.}ntemittent or other**dispe~'** dependent:control:system**for~the** purposes of meetfng any air pollut1\)1S

irenent,adopted**~rsuantto** the,Clean Air Act as amended August**19~'** 

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­**:~3·,':··~.1[~~The** provisions of this section 4.9**ar~** applicable only to sOu-:,**N,~t.1ocatedin** a nonattainment area for ozone as defined in the State

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### r-~servoir or other**(~?~';:""~'~',,:with,a** capacity greater than 40,000 gal10ns (158.000**liters~** ..**,;:~.·'L,~:~~'~:)used** to ,store volatile petroleUII 1 iQuids with a true vapor**;:r-:-~ ~~:tf~1;?29reater'than**  10.5 leilo pascals (1.52 psia) at storage**temDer~:.· ::;r,~;~m~~t":,,:be**  fitted with control equi;:ment which will minimize vapor**1~~5 ;::i~·1lf:f';'·;';";';~latmosphere.**  Such storage vessels. except storage vessels er-e-:::**.~~ ~~~lrJanur.ry**  1.-'1979 which are equ'ipped with externa: floating ""'00-::.

"**"-~'be,fittedwith** an internal floatfngroof which shall rest 

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