Document:

EX-10.22

 Exhibit 10.22 
 SECOND AMENDMENT OF 
 PACKAGING CORPORATION OF AMERICA 

SUPPLEMENTAL EXECUTIVE RETIREMENT PLAN 
 (As Amended and Restated Effective as of January 1, 2005) 
 Pursuant to the
authority set forth in Article IV, Section 4.1 thereof, the Packaging Corporation of America Supplemental Executive Retirement Plan (the “Plan”) is hereby amended, effective as of March 1, 2013, by inserting the following Appendix B to the
Plan, immediately following Appendix A: 
 “Appendix B 

Special Provisions Applicable to Thomas A. Hassfurther 
 This Appendix B sets forth certain special provisions of the Plan with respect to the benefits of Thomas A. Hassfurther (“Hassfurther”). 

1. Defined Terms. Unless otherwise noted, capitalized terms used in this Appendix B shall have the same meanings ascribed to them
in the Plan. 
 2. Participation Service. For purposes of determining Hassfurther’s Participation Service under the
Plan, the maximum limit of 35 Years of Participation in the PCA Pension Plan shall be increased to a maximum limit of 45 Years of Participation. Nothing herein shall modify the definition of Service Ratio with respect to Hassfurther; thus, if
Hassfurther’s Participation Service exceeds 35 Years of Participation, his Service Ratio under the Plan would exceed 1.0.” 
 In all other respects, the Plan shall remain in full force and effect. 
 IN WITNESS WHEREOF, and as conclusive evidence of the adoption of the foregoing, Packaging Corporation of America causes these presents to be duly executed by its proper officer thereunto duly authorized
this 28th day of February, 2013. 

PACKAGING CORPORATION OF AMERICA 

By: /s/ Stephen T. Calhoun 
 Its: Vice President, Human ResourcesEX-10.23

 Exhibit 10.23 
 THIRD AMENDMENT OF 
 PACKAGING CORPORATION OF AMERICA 

SUPPLEMENTAL EXECUTIVE RETIREMENT PLAN 
 (As Amended and Restated Effective as of January 1, 2005) 
 Pursuant to the
authority set forth in Article IV, Section 4.1 thereof, the Packaging Corporation of America Supplemental Executive Retirement Plan (the “Plan”) is hereby amended, effective as of March 1, 2013, by inserting the following Appendix C to the
Plan, immediately following Appendix B: 
 “Appendix C 

Special Provisions Applicable to Thomas W. H. Walton 
 This Appendix C sets forth certain special provisions of the Plan with respect to the benefits of Thomas W. H. Walton (“Walton”). 

1. Defined Terms. Unless otherwise noted, capitalized terms used in this Appendix C shall have the same meanings ascribed to them
in the Plan. 
 2. Participation Service. For purposes of determining Walton’s Participation Service under the Plan,
the maximum limit of 35 Years of Participation in the PCA Pension Plan shall be increased to a maximum limit of 45 Years of Participation. Nothing herein shall modify the definition of Service Ratio with respect to Walton; thus, if Walton’s
Participation Service exceeds 35 Years of Participation, his Service Ratio under the Plan would exceed 1.0.” 
 In all
other respects, the Plan shall remain in full force and effect. 
 IN WITNESS WHEREOF, and as conclusive
evidence of the adoption of the foregoing, Packaging Corporation of America causes these presents to be duly executed by its proper officer thereunto duly authorized this 28th day of February, 2013. 
 PACKAGING CORPORATION OF AMERICA 
 By: /s/ Stephen T. Calhoun

 Its: Vice President, Human ResourcesEX-10.16

 Exhibit 10.16 

 
  

 
 FIRST AMENDMENT TO

 AMENDED AND RESTATED REVOLVING CREDIT AGREEMENT 

dated as of 
 February 7, 2013 
 among 

WESTERN GAS PARTNERS, LP, 
 as Borrower, 
 WELLS FARGO BANK, NATIONAL ASSOCIATION, 

as Administrative Agent, 
 and 
 The Lenders Party Hereto 

 
  

 

 FIRST AMENDMENT TO 

AMENDED AND RESTATED REVOLVING CREDIT AGREEMENT 
 THIS FIRST AMENDMENT TO AMENDED AND RESTATED REVOLING CREDIT AGREEMENT (this “First Amendment”), dated as of February 7, 2013, is among WESTERN GAS PARTNERS, LP, as the
Borrower, WELLS FARGO BANK, NATIONAL ASSOCIATION, as Administrative Agent, and the Lenders party hereto. 
 R E C I
T A L S 
 A. The Borrower, the Administrative Agent and the Lenders are parties to that certain Amended and Restated
Revolving Credit Agreement dated as of March 24, 2011 (the “Credit Agreement”), pursuant to which the Lenders have made certain loans to and extensions of credit for the account of the Borrower. 

B. The Borrower has requested and the Majority Lenders have agreed to amend certain provisions of the Credit Agreement as set forth in
this First Amendment. 
 C. NOW, THEREFORE, in consideration of the premises and the mutual covenants herein contained, for good
and valuable consideration, the receipt and sufficiency of which are hereby acknowledged, the parties hereto agree as follows: 

Section 1. Defined Terms. Each capitalized term used herein but not otherwise defined herein has the meaning given such term in the Credit
Agreement. Unless otherwise indicated, all article and section references in this First Amendment refer to articles and sections of the Credit Agreement. 
 Section 2. Amendments to Credit Agreement. 
 2.1 Amendments to
Section 1.01. 
 (a) The definition of “Agreement” is hereby deleted and replaced in its entirety to
read as follows: 
 “Agreement” means this Credit Agreement, as amended by the First Amendment and as the same
may from time to time be amended, modified, supplemented or restated. 
 (b) The definition of “Consolidated
EBITDA” is hereby amended in its entirety to read as follows: 
 “Consolidated EBITDA”
— for any period, an amount equal to Consolidated Net Income for such period plus, to the extent deducted in determining Consolidated Net Income for such period, the aggregate amount of (a) taxes based on or measured by income,
(b) Consolidated Interest Expense, (c) depreciation and amortization expenses and (d) non-cash equity-based or similar non-cash incentive-based awards or arrangements, non-cash compensation expense or costs, including any such
non-cash charges arising from stock options, restricted stock grants or other non-cash equity 

 
incentive grants; provided that, at the Borrower’s option, and subject to the approval of the Administrative Agent (such approval not to be unreasonably withheld or delayed),
Consolidated EBITDA shall be calculated by giving effect to Material Project EBITDA Adjustments. 
 (c) The following definition
is hereby added where alphabetically appropriate to read as follows: 
 “First Amendment” means
the First Amendment to Amended and Restated Revolving Credit Agreement dated as of February 7, 2013 among the Borrower, the Administrative Agent and the Lenders party thereto. 
 Section 3. Conditions Precedent. This First Amendment shall not become effective until the date on which each of the following conditions is satisfied (or waived in accordance with
Section 12.02 of the Credit Agreement) (the “First Amendment Effective Date”): 
 3.1 The Administrative
Agent shall have received from the Majority Lenders and the Borrower, counterparts (in such number as may be requested by the Administrative Agent) of this First Amendment signed on behalf of such Persons. 

3.2 No Default or Event of Default shall have occurred and be continuing, both prior and after giving effect to the terms of this First
Amendment. 
 3.3 The Administrative Agent shall have received such other documents as the Administrative Agent or special
counsel to the Administrative Agent may reasonably request. 
 The Administrative Agent is hereby authorized and directed to declare this First
Amendment to be effective when it has received documents confirming or certifying, to the satisfaction of the Administrative Agent, compliance with the conditions set forth in this Section 3 or the waiver of such conditions as permitted hereby.
Such declaration shall be final, conclusive and binding upon all parties to the Credit Agreement for all purposes. 
 Section 4.
Miscellaneous. 
 4.1 Confirmation. The provisions of the Credit Agreement, as amended by this First Amendment,
shall remain in full force and effect following the effectiveness of this First Amendment. 
 4.2 Ratification and
Affirmation; Representations and Warranties. The Borrower hereby (a) ratifies and affirms its respective obligations under, and acknowledges, renews and extends its respective continued liability under, each Loan Document to which it is a
party and agrees that each Loan Document to which it is a party remains in full force and effect, except as expressly amended hereby, notwithstanding the amendments contained herein and (b) represents and warrants to the Lenders that, as of the
date hereof, after giving effect to the terms of this First Amendment: (i) all of the representations and warranties contained in each Loan Document to which it is a party are true and correct, except to the extent any such representations and
warranties are expressly limited to an earlier date, in which case, such representations and 

  
 2 

 
warranties shall continue to be true and correct as of such specified earlier date, (ii) no Default has occurred and is continuing and (iii) no Material Adverse Effect shall have
occurred. 
 4.3 Counterparts. This First Amendment may be executed by one or more of the parties hereto in any number of
separate counterparts, and all of such counterparts taken together shall be deemed to constitute one and the same instrument. Delivery of this First Amendment by facsimile transmission shall be effective as delivery of a manually executed
counterpart hereof. 
 4.4 No Oral Agreement. This First Amendment, the Credit Agreement and the other Loan Documents and
any separate letter agreements with respect to fees payable to the Administrative Agent constitute the entire contract among the parties relating to the subject matter hereof and thereof and supersede any and all previous agreements and
understandings, oral or written, relating to the subject matter hereof and thereof. This First Amendment, the Credit Agreement and the other Loan Documents represent the final agreement among the parties hereto and thereto and may not be
contradicted by evidence of prior, contemporaneous or subsequent oral agreements of the parties. There are no unwritten oral agreements between the parties. 
 4.5 GOVERNING LAW. THIS FIRST AMENDMENT SHALL BE GOVERNED BY, AND CONSTRUED IN ACCORDANCE WITH, THE LAWS OF THE STATE OF NEW YORK. 

[SIGNATURES BEGIN NEXT PAGE] 

  
 3 

 IN WITNESS WHEREOF, the parties hereto have caused this First Amendment to be duly executed
as of the date first written above. 
  

							
	 BORROWER:
	 		  	WESTERN GAS PARTNERS, LP
				
		 		  	By:	  	 Western Gas Holdings, LLC,

its general partner

				
		 		  	By:	  	 /s/ Benjamin M. Fink

		 		  	Name:	  	Benjamin M. Fink
		 		  	Title:	  	Senior Vice President,
		 		  		  	Chief Financial Officer and Treasurer
			
	ADMINISTRATIVE AGENT:	 		  	WELLS FARGO BANK,
 NATIONAL
ASSOCIATION

				
		 		  	By:	  	 /s/ Courtney Kubesch

		 		  	Name:	  	Courtney Kubesch
		 		  	Title:	  	Vice President

  
 [Signature
Page to First Amendment] 

							
	 LENDERS:
	 		  	WELLS FARGO BANK,
 NATIONAL
ASSOCIATION

				
		 		  	By:	  	 /s/ Courtney Kubesch

		 		  	Name:	  	Courtney Kubesch
		 		  	Title:	  	Vice President
			
		 		  	DNB BANK ASA, NEW YORK BRANCH
				
		 		  	By:	  	 /s/ Sanjiv Nayar

		 		  	Name:	  	Sanjiv Nayar
		 		  	Title:	  	Senior Vice President
				
		 		  	By:	  	 /s/ Stian Lovseth

		 		  	Name:	  	Stian Lovseth
		 		  	Title:	  	First Vice President
			
		 		  	BANK OF MONTREAL
				
		 		  	By:	  	 /s/ James V. Ducote

		 		  	Name:	  	James V. Ducote
		 		  	Title:	  	Director
			
		 		  	COMERICA BANK
				
		 		  	By:	  	 /s/ Jeff Treadway

		 		  	Name:	  	Jeff Treadway
		 		  	Title:	  	Vice President
			
		 		  	THE BANK OF TOKYO-MITSUBISHI UFJ, LTD.
				
		 		  	By:	  	 /s/ Andrew Oram

		 		  	Name:	  	Andrew Oram
		 		  	Title:	  	Managing Director

  
 [Signature
Page to First Amendment] 

							
		 		  	BARCLAYS BANK
				
		 		  	By:	  	 /s/ Vanessa Kurbatskiy

		 		  	Name:	  	Vanessa Kurbatskiy
		 		  	Title:	  	Vice President
			
		 		  	CITIBANK, N.A.
				
		 		  	By:	  	 /s/ Lawrence Martin

		 		  	Name:	  	Lawrence Martin
		 		  	Title:	  	Vice President
			
		 		  	DEUTSCHE BANK AG NEW YORK BRANCH
				
		 		  	By:	  	 /s/ Kevin Chichester

		 		  	Name:	  	Kevin Chichester
		 		  	Title:	  	Director
				
		 		  	By:	  	 /s/ Robert M. Wood, Jr.

		 		  	Name:	  	Robert M. Wood, Jr.
		 		  	Title:	  	Director
			
		 		  	MORGAN STANLEY BANK, N.A.
				
		 		  	By:	  	 /s/ William Jones

		 		  	Name:	  	William Jones
		 		  	Title:	  	Authorized Signatory
			
		 		  	ROYAL BANK OF CANADA
				
		 		  	By:	  	 /s/ Jay T. Sartain

		 		  	Name:	  	Jay T. Sartain
		 		  	Title:	  	Authorized Signatory

  
 [Signature
Page to First Amendment] 

							
		 		  	SOCIETE GENERALE
				
		 		  	By:	  	 /s/ Anson D. Williams

		 		  	Name:	  	Anson D. Williams
		 		  	Title:	  	Director
			
		 		  	THE BANK OF NOVA SCOTIA
				
		 		  	By:	  	 /s/ Terry Donovan

		 		  	Name:	  	Terry Donovan
		 		  	Title:	  	Managing Director
			
		 		  	THE ROYAL BANK OF SCOTLAND PLC
				
		 		  	By:	  	 /s/ David Slye

		 		  	Name:	  	David Slye
		 		  	Title:	  	Authorised Signatory
			
		 		  	U.S. BANK NATIONAL ASSOCIATION
				
		 		  	By:	  	 /s/ Patrick Jeffrey

		 		  	Name:	  	Patrick Jeffrey
		 		  	Title:	  	Vice President
			
		 		  	UBS LOAN FINANCE LLC
				
		 		  	By:	  	 /s/ Lana Gifas

		 		  	Name:	  	Lana Gifas
		 		  	Title:	  	Director
				
		 		  	By:	  	 /s/ Joselin Fernandes

		 		  	Name:	  	Joselin Fernandes
		 		  	Title:	  	Associate Director

  
 [Signature
Page to First Amendment] 

							
		 		 	AMEGY BANK NATIONAL ASSOCIATION
				
		 		 	By:	  	 /s/ Kenneth R. Batson, III

		 		 	Name:	  	Kenneth R. Batson, III
		 		 	Title:	  	Vice President
			
		 		 	BRANCH BANKING AND TRUST COMPANY
				
		 		 	By:	  	 /s/ DeVon J. Lang

		 		 	Name:	  	DeVon J. Lang
		 		 	Title:	  	Vice President

  
 [Signature
Page to First Amendment]

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