LIMITED POWER OF ATTORNEY FOR
SECTION 16 REPORTING OBLIGATIONS

                            POWER OF ATTORNEY
	             For Executing Forms 3, 4 and 5

	KNOW ALL BY THESE PRESENT, that the undersigned hereby constitutes and appoints
each of Daniel A. Brailer, Marcy Smorey-Giger and Sharon Jack, signing singly,
his/her true and lawful attorney-in-fact to:

(1)	execute for and on behalf of the undersigned  Forms 3, 4 and 5, and
amendments thereto, in accordance with Section 16 of the Securities Exchange Act
of 1934, as amended, and the rules thereunder;

(2)	do and perform any and all acts for and on behalf of the undersigned that
may be necessary or desirable to complete the execution of any such Forms 3, 4
or 5, or amendment thereto, and the filing of such form with the United States
Securities and Exchange Commission and any other authority; and

(3)	take any other action of any type whatsoever in connection with the
foregoing that, in the opinion of such attorney-in-fact, may be of benefit to,
in the best interest of, or legally required by, the undersigned, it being
understood that the documents executed by such attorney-in-fact on behalf of the
undersigned pursuant to this Power of Attorney shall be in such form and shall
contain such terms and conditions as such attorney-in-fact may approve in
his/her discretion.

	The undersigned hereby grants to each such attorney-in-fact full power and
authority to do and perform all and every act and thing whatsoever requisite,
necessary and proper to be done in the exercise of any of the rights and powers
herein granted, as fully to all intents and purposes as the undersigned might or
could do if personally present, with full power of substitution or revocation,
hereby ratifying and confirming all that such attorney-in-fact, or his/her
substitute or substitutes, shall lawfully do or cause to be done by virtue of
this power of attorney and the rights and powers herein granted.  The
undersigned acknowledges that the foregoing attorneys-in-fact, in serving in
such capacity at the request of the undersigned, are not assuming any of the
undersigned's responsibilities to comply with Section 16 of the Securities
Exchange Act of 1934, as amended.

	This power-of-attorney shall expire when the undersigned ceases to be required
to file Forms 3, 4 and 5 with the United States Securities and Exchange
Commission or any other authority.

	IN WITNESS WHEREOF, the undersigned has caused this Power of Attorney to be
executed as of this 5th day of September, 2002.


							/s/Stephen A. Van Oss
							Signature


							Stephen A. Van Oss
							Print Name

Commonwealth of Pennsylvania )
                             )  ss.
County of Alegheny           )

	Sworn to before me this 5th day of September, 2002.


							/s/Heidi J. DeBaldo
							Notary Public

(SEAL)