EXHIBIT A Leasehold Improvement Plans and Scope of Work/Additional Work [See attached. _ pages follow.] 3

A. West Real Estate and Management, Inc., a Minnesota corporation (''Original

Landlord"), and Tenant previously entered into that certain Lease dated October 21, 2004 (the "Original

Lease") pertaining to certain "leased premises," as more particularly described in the Original Lease,

located at 10851 Louisiana Avenue South, Bloomington, Minnesota, consisting of approximately 68,040

square feet. The Original Lease was amended by that certain First Addendum to Lease dated February

23, 2005 ("First Addendum"), that certain First Amendment to Lease dated September 23, 2008 ("First

Amendment"), that certain Second Amendment to Lease dated March 5, 2009 ("Second Amendment"),

that certain Third Amendment to Lease dated February 5, 2010 ("Third Amendment"), that certain

Fourth Amendment to Lease dated May 12, 2010 ("Fourth Amendment'), and that certain Fifth

Amendment to Lease dated November 2012 ("Fifth Amendment"). Collectively, the Original Lease,

First Addendum, First Amendment, Second Amendment, Third Amendment, Fourth Amendment, and

Fifth Amendment are referred to herein as the "Lease".

2. Additional Tenant Work. Landlord hereby approves of the additional leasehold

improvements specifically defined by the "scope of work" as set forth on the attached Exhibit A

("Additional Work") and the drawing also attached as Exhibit A (the "Leasehold Improvement

Plans"). Except for the Additional Work as described in the Leasehold Improvement Plans, Landlord

does not consent to or approve of any other alterations or improvements to the leased premises.

Paragraph 4 of the First Amendment (as amended) is hereby amended to include all of the Additional

Work as an addition to those items already defined in numbers 1-5 therein. Tenant hereby acknowledges,

agrees and confirms that at the expiration or sooner termination of the Lease, Tenant shall be required to

remove the Additional Work and restore the leased premises to its original condition as set forth in

Section 9 of tile Lease (as amended).

3. Condition of Premises. Tenant is in possession of the leased premises and accepts the

same "as is" without any agreements, representations, understandings or obligations on the part of

Landlord to perform any alterations, repairs or improvements or to pay for the costs of any alterations,

4. Miscellaneous. With the exception of those matters set forth in this Amendment,

Tenant's leasing of the leased premises shall be subject to all terms, covenants and conditions of the

Lease. In the event of any express conflict or inconsistency between the terms of this Amendment and the

terms of the Lease, the terms of this Amendment shall control and govern. Except as expressly modified

by this Amendment, all other terms and conditions of the Lease, are hereby ratified and affirmed, The

parties acknowledge that the Lease is a valid and enforceable agreement and that Tenant holds no claims

or defenses against Landlord or its agents which might serve as the basis of any set-off against accruing

rent and other charges or any other remedy at law or in equity. This Amendment may be signed in

counterparts, each of which shall be deemed to be an original, and all of such counterparts shall constitute

one agreement. The Lease as modified by this Amendment constitutes the complete agreement between

the parties and supersedes any prior oral or written agreements between the parties. Delivery by Landlord

or Tenant of faxed or emailed signatures of this Amendment shall be deemed original signatures for all

purposes.

IN WITNESS WHEREOF, the foregoing Amendment is dated effective as of the date and year first

above written.

McGough proposes to reconfigure ATMl's lab per the attached as directed and agreed with Amy Koland and to

design/furnish/install a 8'X20' metal-framed/drywall-enclosed chemical storage room In the SE corner of the exIsting SE warehouse area at the ATMI facility at 10851 Louisiana Ave S., Bloomington, MN for a not-to-exceed cost of $448,500. Rates per the current ATMI/McGough agreement with a fee of 2.5%. Final drawings and as-bullts will be provIded after authorization to proceed. The estimated duration is 12 to 14 weeks. McGough will work with ATMI to maintain lab

functionality to the extent possible. ATMI will remove existing racking In the area intended for chemical storage and will

be responsible for moving benchtop equipment within the lab space.

Please advise at your convenience.

Sincerely,

Tom

Thomas W Hannasch PE, LEED AP. DBIA

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