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“(B) for specific law enforcement purposes; 
“(2) shall he disclosed to contractors with the Com- 
mission and employees of such contractors if in the opin- 
ion of the Commission such disclosure is necessary for 
the satisfactory performance of the work of such con- 
tractor in connection with this title and under such con- 
ditions as the Commission may specify; 
“(■ 3 ) shall be disclosed if it is necessary to protect 
health or the environment against an unreasonable risk 
of injury to health or the environment; or 
u ( 4) may be disclosed when relevant in any pro- 
ceeding under this title, except that disclosure in such 
proceeding shall be made in such manner as to preserve 
confidentiality to the extent practicable without impairing 
the proceeding. 
In any proceeding under section 552(a) of title 5, United 
States Code, to obtain information the disclosure of which 
has been denied because of the provisions of this subsection, 
the Commission may not rely on section 552(b) (3) of such 
title to sustain the Commission’s action. 
“ (b)(1) In submitting data under this title, a person 
may (A) designate the data which such person believes is 
entitled to confidential treatment under subsection (a), and 
(B) submit such designated data simultaneously but sepa- 
rately from other data submitted under this title. A designa- 
[ 727 ] 
