AGREEMENT OF EQUIPMENT SUBSTITUTION

Exhibit 10.23.4

AGREEMENT OF

EQUIPMENT SUBSTITUTION

AFFECTING LOAN NO 1000137842 dated July 31, 2013, be it understood and agreed by and between JPMORGAN CHASE BANK, N.A. (“Lender”) and Borrower identified below:

SUBSTITUTE EQUIPMENT. The following equipment is substituted for equipment covered under the above Loan:

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RELEASED EQUIPMENT. The following equipment is released from the above Loan:

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The undersigned Borrower represents and warrants that it has acquired the Substitute Equipment at its sole expense, that the purchase price of the Substitute Equipment has been paid in full by Borrower, and that the Substitute Equipment is free and clear of any liens, security interest and other encumbrances except for the rights of Lender under the above Loan and the documents related to it.

Except as expressly amended hereby, the above Loan and all documents related to it remain in full force and effect.

NOW, THEREFORE, the above Acknowledgement has been read and is hereby agreed to by the undersigned parties on this 15th day of January, 2014.

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