Document:

Form of Exchange Note

 Exhibit 4.13 
 QUALITY DISTRIBUTION, LLC 
 QD CAPITAL CORPORATION 
 Senior Floating Rate Note due 2012, Series B 
 THIS
NOTE WAS ISSUED WITH “ORIGINAL ISSUE DISCOUNT” WITHIN THE MEANING OF SECTION 1272, ET SEQ. OF THE INTERNAL REVENUE CODE OF 1986, AS AMENDED. UPON WRITTEN REQUEST, THE CORPORATION WILL PROVIDE PROMPTLY TO ANY HOLDER OF THE NOTE (1) THE
ISSUE PRICE AND DATE OF THE NOTE, (2) THE AMOUNT OF ORIGINAL ISSUE DISCOUNT ON THE NOTE AND (3) THE ORIGINAL YIELD TO MATURITY OF THE NOTE. SUCH REQUEST SHOULD BE SENT TO THE CORPORATION AT 4041 PARK OAKS BLVD., SUITE 200, TAMPA, FLORIDA
33610, ATTN: CHIEF FINANCIAL OFFICER. 
  

							
	   No.
	  	 	  	  Principal Amount $	  	 
	 ISIN No.
	  		  		  	
	 CUSIP No.
	  		  		  	

 QUALITY DISTRIBUTION, LLC, a Delaware limited liability company (the “Company”)
and QD CAPITAL CORPORATION, a Delaware corporation (“QD Capital”, and together with the Company, the “Issuers”), which terms include any of their successors under the Indenture hereinafter referred to), for value
received promise to pay to CEDE & CO. or registered assigns, the principal sum of Dollars ($) on January 15, 2012. 
 Interest Payment Dates: January 15, April 15, July 15 and October 15; commencing January 15, 2008. 
 Record Dates: January 1, April 1, July 1 and October 1. 
 Reference is made to the further provisions of this
Security contained herein, which will for all purposes have the same effect as if set forth at this place. 

 IN WITNESS WHEREOF, the Issuers have caused this Security to be signed manually or by facsimile by their
duly authorized officers. 
 Dated: 
  

			
	QUALITY DISTRIBUTION, LLC
		
	By:	 	  

		 	Timothy B. Page
		 	Senior Vice President and
		 	Chief Financial Officer
	
	QD CAPITAL CORPORATION
		
	By:	 	  

		 	Timothy B. Page
		 	Senior Vice President and
		 	Chief Financial Officer

  

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 [FORM OF TRUSTEE’S CERTIFICATE OF AUTHENTICATION] 
 This is one of the Senior Floating Rate Notes due 2012, Series B described in the within-mentioned Indenture. 
  

			
	 THE BANK OF NEW YORK TRUST
 COMPANY, N.A., as
Trustee

		
	 By:
	 	  

		 	 Christie Leppert

		 	 Assistant Vice President

  

 3 

 [REVERSE OF SECURITY] 
 QUALITY DISTRIBUTION, LLC 
 QD CAPITAL CORPORATION

 Senior Floating Rate Note due 2012, Series B 
 1. Interest 
 QUALITY DISTRIBUTION, LLC, a Delaware limited liability company (the
“Company”) and QD CAPITAL CORPORATION, a Delaware corporation (“QD Capital”, and together with the Company, the “Issuers”), which terms include any of their successors under the Indenture
hereinafter referred to), promise to pay interest on the principal amount of this Security at a rate per annum, reset quarterly, equal to LIBOR plus 4.50%, as determined by the calculation agent (the “Calculation Agent”), which
shall initially be the trustee for the Securities, except that interest for the first Interest Period ending January 14, 2008 shall accrue at a rate of 9.72% per annum. Interest will be payable quarterly in cash in arrears on each
January 15, April 15, July 15 and October 15 (each an “Interest Payment Date”), commencing on January 15, 2008, to the persons who are registered holders at the close of business on the January 1,
April 1, July 1 and October 1 immediately preceding the applicable Interest Payment Date. Interest on the Securities will accrue from the most recent date for which interest has been paid or, if no interest has been paid, from and
including the date of issuance. 
 The Issuers shall pay interest on overdue principal from time to time on demand at the rate borne by this
Security plus 2% and on overdue installments of interest (without regard to any applicable grace periods) to the extent lawful. 
 The
Securities will not be entitled to the benefit of any mandatory sinking fund. 
 Set forth below is a summary of certain of the defined terms
used in connection with the determination of interest on the Securities. 
 “Determination Date,” with respect to an
Interest Period, will be the second London Banking Day preceding the first day of the Interest Period. 
 “Interest Period”
means the period commencing on and including an Interest Payment Date and ending on and including the day immediately preceding the next succeeding Interest Payment Date, with the exception that the first Interest Period shall commence on and
include the Issue Date and end on and include January 14, 2008. 
 “LIBOR,” with respect to an Interest Period, will be
the rate (expressed as a percentage per annum) for deposits in United States dollars for a three-month period beginning on the second London Banking Day after the Determination Date that appears on Telerate Page 3750 as of 11:00 a.m., London time,
on the Determination Date. If Telerate Page 3750 does not include such a rate or is unavailable on a Determination Date, the Calculation Agent will request the principal London office of each of four major banks in the London interbank market, as
selected by the Calculation Agent, to provide such bank’s offered quotation (expressed as a percentage per annum), as of approximately 11:00 a.m., London time, on such Determination Date, to prime banks in the London interbank market for
deposits in a Representative Amount in United States dollars for a three-month period beginning on the second London Banking Day after the Determination Date. If at least two such offered quotations are so provided, LIBOR for the Interest Period
will be the arithmetic mean of such quotations. If fewer than two such quotations are so provided, the Calculation Agent will request each of three major banks in New York City, as selected by the Calculation Agent, to provide such bank’s rate
(expressed as a percentage per annum), as of approximately 11:00 a.m., New York City time, on such Determination Date, for loans in a Representative Amount in United States dollars to leading European banks for a three-month period 

  

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beginning on the second London Banking Day after the Determination Date. If at least two such rates are so provided, LIBOR for the Interest Period will be
the arithmetic mean of such rates. If fewer than two such rates are so provided, then LIBOR for the Interest Period will be LIBOR in effect with respect to the immediately preceding Interest Period. 
 “London Banking Day” is any day in which dealings in United States dollars are transacted or, with respect to any future date, are
expected to be transacted in the London interbank market. 
 “Representative Amount” means a principal amount of not less
than US$1,000,000 for a single transaction in the relevant market at the relevant time. 
 “Telerate Page 3750” means the
display designated as “Page 3750” on the Moneyline Telerate service (or such other page as may replace Page 3750 on that service). 
 The amount of interest for each day that the Securities are outstanding (the “Daily Interest Amount”) will be calculated by dividing the interest rate in effect for such day by 360 and multiplying the result by the
principal amount of the Securities. The amount of interest to be paid on the Securities for each Interest Period will be calculated by adding the Daily Interest Amounts for each day in the Interest Period. 
 All percentages resulting from any of the above calculations will be rounded, if necessary, to the nearest one hundred-thousandth of a percentage point,
with five one-millionths of a percentage point being rounded upwards (e.g., 9.876545% (or .09876545) being rounded to 9.87655% (or .0987655)) and all dollar amounts used in or resulting from such calculations will be rounded to the nearest cent
(with one-half cent being rounded upwards). 
 The interest rate on the Securities will in no event be higher than the maximum rate permitted
by New York law as the same may be modified by United States law of general application. 
 2. Method of Payment. 
 The Issuers shall pay interest on the Securities (except defaulted interest) to the Persons who are the registered Holders at the close of business on the
Record Date immediately preceding the Interest Payment Date even if the Securities are canceled on registration of transfer or registration of exchange (including pursuant to an Exchange Offer (as defined in the Indenture)) after such Record Date.
Holders must surrender Securities to a Paying Agent to collect principal payments. The Issuers shall pay principal, premium, if any, and interest in money of the United States that at the time of payment is legal tender for payment of public and
private debts (“U.S. Legal Tender”). However, the Issuers may pay principal, premium, if any, and interest by wire transfer of federal funds, or interest by check payable in such U.S. Legal Tender. The Issuers may deliver any
such interest payment to the Paying Agent or to a Holder at the Holder’s registered address. 
 3. Paying Agent and Registrar. 

Initially, The Bank of New York Trust Company, N.A. (the “Trustee”) will act as Paying Agent and Registrar. The Issuers may change any
Paying Agent, Registrar or co-Registrar without notice to the Holders. The Company or any of its Subsidiaries may, subject to certain exceptions, act as Registrar or co-Registrar. 
 4. Indenture. 
 The Issuers issued the Securities under an Indenture, dated as of
December 18, 2007 (the “Indenture”), among the Issuers, the Guarantors and the Trustee. This Security is one of a duly 

  

 5 

 
authorized issue of Securities of the Issuers designated as their Senior Floating Rate Notes due 2012, Series B. Capitalized terms herein are used as defined
in the Indenture unless otherwise defined herein. The terms of the Securities include those stated in the Indenture and those made part of the Indenture by reference to the Trust Indenture Act of 1939 (15 U.S.C. §§ 77aaa-77bbbb) (the
“TIA”), as in effect on the date of the Indenture until such time as the Indenture is qualified under the TIA, and thereafter as in effect on the date on which the Indenture is qualified under the TIA. Notwithstanding anything to
the contrary herein, the Securities are subject to all such terms, and Holders of Securities are referred to the Indenture and the TIA for a statement of them. The Securities are general obligations of the Issuers unlimited in amount, of which an
aggregate principal amount of $50,000,000 are being issued on the Issue Date. 
 5. Optional Redemption 
 The Issuers may redeem the Securities, in whole at any time or in part from time to time, upon not less than 30 nor more than 60 days’ notice,
initially at 102% (expressed as a percentage of the principal amount) until January 14, 2008, and thereafter at the following redemption prices (expressed as percentages of the principal amount thereof) if redeemed during the twelve-month
period commencing on January 15 of the years set forth below, plus, in each case, accrued and unpaid interest thereon, if any, to the date of redemption (subject to the right of Holders of record on the relevant record date to receive interest
due on the relevant interest payment date): 
  

				
	 Year
	  	Percentage	 
	 2008
	  	101.000	%
	 2009 and thereafter
	  	100.000	%

 6. Notice of Redemption. 
 Notice of redemption shall be mailed by first-class mail at least 30 days but not more than 60 days before the Redemption Date to each Holder of
Securities to be redeemed at such Holder’s registered address. Securities in denominations of $1,000 may be redeemed only in whole. The Trustee may select for redemption portions (equal to $1,000 or any integral multiple thereof) of the
principal of Securities that have denominations larger than $1,000. 
 If any Security is to be redeemed in part only, the notice of
redemption that relates to such Security shall state the portion of the principal amount thereof to be redeemed. A new Security in a principal amount equal to the unredeemed portion thereof will be issued in the name of the Holder thereof upon
cancellation of the original Security. On and after the Redemption Date, interest will cease to accrue on Securities or portions thereof called for redemption, subject to the provisions of the Indenture. 
 7. Change of Control Offer 
 Upon the
occurrence of a Change of Control, the Issuers will be required, as and to the extent set forth in the Indenture, to offer to purchase all of the outstanding Securities at a purchase price equal to 101% of the principal amount thereof, plus accrued
and unpaid interest, if any, thereon to the date of repurchase (subject to the right of Securityholders of record on the relevant record date to receive interest due on the relevant interest payment date); provided, however, that
notwithstanding the occurrence of a Change of Control, the Issuers shall not be obligated to repurchase the Securities pursuant to this paragraph 7 in the event that the Issuers have exercised their right to redeem all of the Securities under the
terms of paragraph 5 hereof. 
  

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 8. Limitation on Asset Sales. 
 The Issuers are, subject to certain conditions, obligated to make an offer to purchase Securities at 100% of their principal amount, plus accrued and unpaid interest, if any, thereon to the date of repurchase with
certain Net Cash Proceeds of certain sales or other dispositions of assets in accordance with the Indenture. 
 9. Denomination, Transfer,
Exchange. 
 The Securities are in registered form, without coupons, in denominations of $1,000 and integral multiples of $1,000. A Holder
shall register the transfer of or exchange Securities in accordance with the Indenture. The Registrar may require a Holder, among other things, to furnish appropriate endorsements and transfer documents and to pay certain transfer taxes or similar
governmental charges payable in connection therewith as permitted by the Indenture. The Registrar need not register the transfer of or exchange any Securities or portions thereof selected for redemption, except the unredeemed portion of any security
being redeemed in part. 
 10. Persons Deemed Owners. 
 The registered Holder of a Security shall be treated as the owner of it for all purposes. 
 11. Unclaimed Funds.

 If funds for the payment of principal, premium, if any, or interest remain unclaimed for two years, the Trustee and the Paying Agent
will repay the funds to the Issuers at their request. After that, all liability of the Trustee and such Paying Agent with respect to such funds shall cease. 
 12. Discharge Prior to Redemption or Maturity. 
 The Issuers and the Subsidiary Guarantors, if any, may be discharged
from their obligations under the Indenture or the Securities and any Guarantee except for certain provisions thereof, and may be discharged from obligations to comply with certain covenants contained in the Indenture and the Securities and any
Guarantee, in each case upon satisfaction of certain conditions specified in the Indenture. 
 13. Amendment; Supplement; Waiver. 

Subject to certain exceptions, the Indenture and the Securities and any Guarantees may be amended or supplemented with the written consent of the
Holders of at least a majority in aggregate principal amount of the Securities then outstanding, and any existing Default or Event of Default or compliance with any provision may be waived with the consent of the Holders of a majority in aggregate
principal amount of the Securities then outstanding. Without notice to or consent of any Holder, the parties thereto may amend or supplement the Indenture, the Securities and any Guarantee to, among other things, cure any ambiguity, defect or
inconsistency, provide for uncertificated Securities in addition to or in place of certificated Securities or comply with any requirements of the Commission in connection with the qualification of the Indenture under the TIA, or make any other
change that does not materially adversely affect the rights of any Holder of a Security. 
  

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 14. Restrictive Covenants. 
 The Indenture contains certain covenants that, among other things, limit the ability of the Company and its Restricted Subsidiaries to make restricted payments, to incur indebtedness, to create liens, to sell assets,
to permit restrictions on dividends and other payments by Restricted Subsidiaries of the Company to the Company, to consolidate, merge or sell all or substantially all of its assets or to engage in transactions with affiliates. The limitations are
subject to a number of important qualifications and exceptions. The Company must annually report to the Trustee on compliance with such limitations. 
 15. Defaults and Remedies. 
 If an Event of Default occurs and is continuing, the Trustee or the Holders of at least
25% in aggregate principal amount of Securities then outstanding may declare all the Securities to be due and payable immediately in the manner and with the effect provided in the Indenture. Holders of Securities may not enforce the Indenture, the
Securities or any Guarantee except as provided in the Indenture. The Trustee is not obligated to enforce the Indenture, the Securities or the Guarantees, unless it has received reasonable indemnity satisfactory to it. The Indenture permits, subject
to certain limitations therein provided, Holders of a majority in aggregate principal amount of the Securities then outstanding to direct the Trustee in its exercise of any trust or power. The Trustee may withhold from Holders of Securities notice
of certain continuing Defaults or Events of Default if it determines that withholding notice is in their interest. 
 16. Trustee Dealings with
Issuers. 
 The Trustee under the Indenture, in its individual or any other capacity, may become the owner or pledgee of Securities and
may otherwise deal with the Issuers, their Subsidiaries or their respective Affiliates as if it were not the Trustee. 
 17. No Recourse Against
Others. 
 No Affiliate, stockholder, director, officer, employee or limited liability company member of the Issuers or any of their
Subsidiaries shall have any liability for any obligation of the Issuers under the Securities or the Indenture or for any claim based on, in respect of or by reason of, such obligations or their creation. Each Holder of a Security by accepting a
Security waives and releases all such liability. The waiver and release are part of the consideration for the issuance of the Securities. 
 18.
Authentication. 
 This Security shall not be valid until the Trustee or authenticating agent signs the certificate of authentication on
this Security. 
 19. Abbreviations and Defined Terms. 
 Customary abbreviations may be used in the name of a Holder of a Security or an assignee, such as: TEN COM (= tenants in common), TEN ENT (= tenants by the entireties), JT TEN (= joint tenants with right of
survivorship and not as tenants in common), CUST (= Custodian), and U/G/M/A (= Uniform Gifts to Minors Act). 
  

 8 

 20. Governing Law. 
 This Security shall be governed by, and construed in accordance with, the laws of the State of New York but without giving effect to applicable principles of conflicts of law to the extent that the application of the
law of another jurisdiction would be required thereby. 
 21. CUSIP and ISIN Numbers. 
 Pursuant to a recommendation promulgated by the Committee on Uniform Security Identification Procedures, the Issuers have caused CUSIP and ISIN numbers to
be printed on the Securities as a convenience to the Holders of the Securities. No representation is made as to the accuracy of such numbers as printed on the Securities and reliance may be placed only on the other identification numbers printed
hereon. 
 22. Indenture. 
 Each
Holder, by accepting a Security, agrees to be bound by all of the terms and provisions of the Indenture, as the same may be amended from time to time. 
 The Issuers will furnish to any Holder of a Security upon written request and without charge a copy of the Indenture which has the text of this Security in larger type. Requests may be made to: Quality Distribution,
LLC, 4041 Park Oaks Blvd., Suite 200, Tampa, Florida 33610, Attn: Chief Financial Officer. 
  

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 ASSIGNMENT FORM 
  

	
	I or we assign and transfer this Security to
	  

	  

	 (Print or type name, address and zip code of assignee or transferee)

	  

	  

	 (Insert Social Security or other identifying number of assignee or transferee)

 and irrevocably appoint
                                        
                                        
                                        
                 agent to transfer this Security on the books of the Issuers. The agent may substitute another to act for him. 
  

									
	Dated:	  	  
	  		  	Signed:	    	  

		  		  		  		    	(Sign exactly as name appears on the other side of this Security)
	Signature Guarantee:	  		  		    	  

		  		  		  		    	Participant in a recognized Signature Guarantee Medallion Program (or other signature guarantor program reasonably acceptable to the Trustee)

  

 10 

 OPTION OF HOLDER TO ELECT PURCHASE 
 If you want to elect to have this Security purchased by the Company pursuant to Section 4.16 or Section 4.17 of the Indenture, check the
appropriate box: 
  

			
	Section 4.16    ̈	  	Section 4.17    ̈

 If you want to elect to have only part of this Security purchased by the Company pursuant to
Section 4.16 or Section 4.17 of the Indenture, state the amount: $                     
  

									
	Dated:	  	  
	  		  	Signed:	    	  

		  		  		  		    	(Sign exactly as name appears on the other side of this Security)
	Signature Guarantee:	  		  		    	  

		  		  		  		    	Participant in a recognized Signature Guarantee Medallion Program (or other signature guarantor program reasonably acceptable to the Trustee)

  

 11Seventh Amendment to Revolving Credit Agreement dated as of March 21, 2008.

 EXHIBIT 10.1 
 SEVENTH AMENDMENT TO CREDIT AGREEMENT 
 This SEVENTH AMENDMENT TO CREDIT AGREEMENT (this
“Amendment”) is entered into as of March 21, 2008, among WESTLAKE CHEMICAL CORPORATION (“Westlake”) and certain of its domestic subsidiaries listed as Borrowers to the Credit Agreement
described below (collectively, “Borrowers”), Lenders under the Credit Agreement, BANK OF AMERICA, N.A., in its capacity as Agent for Lenders under the Credit Agreement (the “Agent”), and
Guarantors under the Credit Agreement (hereinafter defined). 
 Reference is made to the Credit Agreement, dated as of July 31, 2003 (as
amended, modified, and supplemented, the “Credit Agreement”), among Borrowers, the Agent, and Lenders party thereto. Unless otherwise defined in this Amendment, capitalized terms used herein shall have the meanings set forth
in the Credit Agreement and all Section references herein are to Sections in the Credit Agreement. 
 RECITALS 
 A. Borrowers have requested that Lenders agree to amend certain provisions of the Credit Agreement, including without limitation, amending the definition
of Fixed Charges. 
 B. Subject to the terms and conditions of this Amendment, Lenders are willing to agree to such amendments. 

Accordingly, for adequate and sufficient consideration, the parties hereto agree, as follows: 
 Paragraph 1. Amendment to Credit Agreement. The definition of “Fixed Charges” in Annex A to the Credit Agreement is
amended in its entirety to read as follows: 
 “Fixed Charges” means, with respect to any fiscal period of the Loan
Parties on a consolidated basis, without duplication, (a) interest expense, (b) Capital Expenditures (excluding Capital Expenditures funded with Debt other than Revolving Loans, but including, without duplication, principal payments with
respect to such Debt, and further excluding up to $75,000,000 of Capital Expenditures made by the Loan Parties from April 1, 2006, through and including March 31, 2007, (c) scheduled principal payments of Debt, prepayments and
unscheduled payments (except in connection with a permitted refinancing, replacement, or defeasance) of Debt (other than the Fixed Asset Loan), (d) payments on any deferred payment plan for insurance premiums permitted pursuant to
Section 7.13(j), (e) cash Distributions paid by any Loan Party to Persons other than Westlake and its Subsidiaries, and (f) Federal, state, local, and foreign income taxes, excluding deferred taxes. Except as set forth
below, the following shall be excluded from Fixed Charges: (x) prepayment of up to $275,000,000 of the Bond Debt and (y) on or after January 1, 2008, so long as at least $247,000,000 principal amount of the Bond Debt is outstanding,
an amount not exceeding $255,000,000 in the aggregate of the sum of the following: (i) Capital Expenditures made by the Loan Parties on a consolidated basis, but not exceeding $60,000,000 in each of the fiscal years of Westlake ending
December 31, 2008, December 31, 2009, and December 31, 2010, respectively, and (ii) Distributions on the capital stock of Westlake. Notwithstanding the foregoing, for purposes of: (a) the calculation of the Fixed Charge
Coverage Ratio as used in the calculation of Applicable Margin, (b) the calculation of Fixed Charge Coverage Ratio as used in the determination of certain required prepayments pursuant to Section 7.14(c)(iii) hereof, and
(c) calculation of Pro Forma Fixed Charge Ratio as used in the determination of a permitted Acquisition pursuant to Section 7.26(i) hereof, the amounts described in this subparagraph (y) shall not be excluded.

  

 1 

 Paragraph 2. Effective Date. Notwithstanding any contrary provision, this Amendment is not effective
until the date (the “Effective Date”) upon which: 
 (a) the Agent has received counterparts of this Amendment
executed by each Borrower, each Guarantor, the Agent, and the Required Lenders; 
 (b) all representations and warranties made hereunder and
in the other Loan Documents shall be true and correct as of the date hereof as though made on and as of the date hereof, other than any such representation or warranty which relates to a specified prior date; 
 (c) No Default or Event of Default shall have occurred and be continuing; and 
 (d) Borrowers shall have paid Attorney Costs of the Agent incurred in connection with the Loan Documents, including any outstanding Attorney Costs of the
Agent on the Effective Date. 
 Paragraph 3. Acknowledgment and Ratification. As a material inducement to the Agent and Lenders to
execute and deliver this Amendment, each Borrower and each Guarantor (a) consent to the agreements in this Amendment, and (b) agree and acknowledge that the execution, delivery, and performance of this Amendment shall in no way release,
diminish, impair, reduce, or otherwise affect the respective obligations of Borrowers or Guarantors under their respective Loan Documents, which Loan Documents shall remain in full force and effect, and all Liens, guaranties, and rights thereunder
are hereby ratified and confirmed. The receipt of each Guarantor’s consent and acknowledgement hereunder shall not constitute a requirement that the Agent and Lenders obtain such consent or acknowledgement in connection with any other
amendment, modification, or waiver of any term or provision of any Loan Documents. 
 Paragraph 4. Representations. As a material
inducement to Lenders to execute and deliver this Amendment, each Borrower and each Guarantor represent and warrant to Lenders (with the knowledge and intent that Lenders are relying upon the same in entering into this Amendment) that as of the
Effective Date and as of the date of execution of this Amendment, (a) all representations and warranties in the Loan Documents are true and correct in all material respects as though made on the date hereof, except to the extent that
(i) any of them speak to a different specific date or (ii) the facts on which any of them were based have been changed by transactions contemplated or permitted by the Credit Agreement, (b) no Default or Event of Default exists,
(c) the attachments to, and the certifications made in, the Officer’s Certificates most recently executed and delivered to the Agent and Lenders by each Borrower and Guarantor, have not been modified or amended, remain in full force and
effect, and are hereby ratified and confirmed, and (d) the execution, delivery, and performance of this Amendment have been duly authorized by all necessary partnership, limited liability company, and corporate action and this Amendment constitutes
the valid and binding obligation of each of them. 
 Paragraph 5. Fees and Expenses. Borrowers shall pay all
reasonable costs, fees, and expenses paid or incurred by the Agent in connection with this Amendment, including, without limitation, Attorney Costs of the Agent in connection with the negotiation, preparation, delivery, and execution of this
Amendment and any related documents. 
 Paragraph 6. Waiver. Each Loan Party (a) acknowledges and agrees that, as of the date
hereof, it has no actual or potential claim or cause of action against the Agent or any Lender relating to any Loan Documents or any actions or events occurring on or before the date of this Amendment and (b) waives and releases any right to
assert such claim or cause of action to the extent based on actions or events occurring on or before the date hereof. 
 Paragraph 7.
Miscellaneous. 
 7.1 This Amendment is a “Loan Document” referred to in the Credit Agreement, and the
provisions relating to Loan Documents in Article 13 of the Credit Agreement are incorporated in this Amendment by reference. Unless stated otherwise (a) the singular number includes the plural and vice versa and words
of any gender include each other gender, in each case, as appropriate, (b) headings and captions may not be construed in 

  

 2 

 
interpreting provisions, (c) this Amendment must be construed, and its performance enforced, under New York law, (d) if any part of this Amendment
is for any reason found to be unenforceable, all other portions of it nevertheless remain enforceable, and (e) this Amendment may be executed in any number of counterparts with the same effect as if all signatories had signed the same document,
and all of those counterparts must be construed together to constitute the same document. 
 7.2 The Loan Documents shall remain unchanged
and in full force and effect, except as provided in this Amendment, and are hereby ratified and confirmed. On and after the Effective Date, all references to the “Credit Agreement” shall be to the Credit Agreement as herein amended.
The execution, delivery, and effectiveness of this Amendment shall not operate as a waiver of any rights of Lenders under any Loan Document, nor constitute a waiver under any of the Loan Documents. 
 Paragraph 8. ENTIRE AGREEMENT. THIS AMENDMENT
REPRESENTS THE FINAL AGREEMENT BETWEEN THE PARTIES ABOUT THE SUBJECT MATTER
OF THIS AMENDMENT 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. 
 Paragraph 9. Parties. This Amendment binds and inures to Borrowers, Guarantors, the Agent, Lenders, and their respective successors and assigns. 
 The parties hereto have executed this Amendment in multiple counterparts to be effective as of the Effective Date. 
 Remainder of Page Intentionally Blank. 
 Signature Pages to Follow. 
  

 3 

 Signature Page to that certain Seventh Amendment to Credit Agreement dated as of the date first stated above, among
Westlake Chemical Corporation and certain of its domestic subsidiaries, as Borrowers, Bank of America, N.A., in its capacity as Agent, Required Lenders, and Guarantors. 
  

			
	 BANK OF AMERICA, N.A., as the Agent and a Lender

		
	 By:
	 	/s/ David T. Knoblauch
		 	 
	 Name:
	 	David T. Knoblauch
	 Title:
	 	Senior Vice President

  

 4 

 Signature Page to that certain Seventh Amendment to Credit Agreement dated as of the date first stated above, among
Westlake Chemical Corporation and certain of its domestic subsidiaries, as Borrowers, Bank of America, N.A., in its capacity as Agent, Required Lenders, and Guarantors. 
  

			
	 GENERAL ELECTRIC CAPITAL CORPORATION,
 as a Lender

		
	 By:
	 	/s/ Alison P. Trapp
		 	 
	 Name:
	 	Alison P. Trapp
		 	 
	 Title:
	 	Duly Authorized Signatory
		 	 

  

 5 

 Signature Page to that certain Seventh Amendment to Credit Agreement dated as of the date first stated above, among
Westlake Chemical Corporation and certain of its domestic subsidiaries, as Borrowers, Bank of America, N.A., in its capacity as Agent, Required Lenders, and Guarantors. 
  

			
	 THE CIT GROUP/BUSINESS CREDIT, INC.,
 as a Lender

		
	 By:
	 	/s/ Jang Kim
		 	 
	 Name:
	 	Jang Kim
		 	 
	 Title:
	 	Vice President
		 	 

  

 6 

 Signature Page to that certain Seventh Amendment to Credit Agreement dated as of the date first stated above, among
Westlake Chemical Corporation and certain of its domestic subsidiaries, as Borrowers, Bank of America, N.A., in its capacity as Agent, Required Lenders, and Guarantors. 
  

			
	 PNC BANK, NATIONAL ASSOCIATION,
 as a Lender

		
	 By:
	 	/s/ Paul R. Frank
		 	 
	 Name:
	 	Paul R. Frank
		 	 
	 Title:
	 	Vice President
		 	 

  

 7 

 Signature Page to that certain Seventh Amendment to Credit Agreement dated as of the date first stated above, among
Westlake Chemical Corporation and certain of its domestic subsidiaries, as Borrowers, Bank of America, N.A., in its capacity as Agent, Required Lenders, and Guarantors. 
  

			
	 WELLS FARGO FOOTHILL, LLC,
 as a Lender

		
	 By:
	 	/s/ Juan Barrera
		 	 
	 Name:
	 	Juan Barrera
		 	 
	 Title:
	 	Vice President
		 	 

  

 8 

 Signature Page to that certain Seventh Amendment to Credit Agreement dated as of the date first stated above, among
Westlake Chemical Corporation and certain of its domestic subsidiaries, as Borrowers, Bank of America, N.A., in its capacity as Agent, Required Lenders, and Guarantors. 
  

			
	 UBS AG, STAMFORD BRANCH,
 as a Lender

		
	 By:
	 	/s/ Richard L. Tavrow
		 	 
	 Name:
	 	Richard L. Tavrow
		 	 
	 Title:
	 	Director
		 	 
		
	 By:
	 	/s/ David B. Julie
		 	 
	 Name:
	 	David B. Julie
		 	 
	 Title:
	 	Associate Director
		 	 

  

 9 

 Signature Page to that certain Seventh Amendment to Credit Agreement dated as of the date first stated above, among
Westlake Chemical Corporation and certain of its domestic subsidiaries, as Borrowers, Bank of America, N.A., in its capacity as Agent, Required Lenders, and Guarantors. 
  

			
	 CREDIT SUISSE FIRST BOSTON, acting through
 its Cayman Islands Branch, as a Lender

		
	 By:
	 	/s/ Denise Alvarez
		 	 
	 Name:
	 	Denise Alvarez
		 	 
	 Title:
	 	Vice President
		 	 
		
	 By:
	 	/s/ James Neira
		 	 
	 Name:
	 	James Neira
		 	 
	 Title:
	 	Associate
		 	 

  

 10 

 Signature Page to that certain Seventh Amendment to Credit Agreement dated as of the date first stated above, among
Westlake Chemical Corporation and certain of its domestic subsidiaries, as Borrowers, Bank of America, N.A., in its capacity as Agent, Required Lenders, and Guarantors. 
  

			
	 DEUTSCHE BANK TRUST COMPANY AMERICAS,
 as a Lender

		
	 By:
	 	/s/ Marguerite Sutton
		 	 
	 Name:
	 	Marguerite Sutton
		 	 
	 Title:
	 	Director
		 	 
		
	 By:
	 	/s/ Enrique Landaeta
		 	 
	 Name:
	 	Enrique Landaeta
		 	 
	 Title:
	 	Vice President
		 	 

  

 11 

 Signature Page to that certain Seventh Amendment to Credit Agreement dated as of the date first stated above, among
Westlake Chemical Corporation and certain of its domestic subsidiaries, as Borrowers, Bank of America, N.A., in its capacity as Agent, Required Lenders, and Guarantors. 
  

					
	BORROWERS AND GUARANTORS:
		
		 	 WESTLAKE CHEMICAL CORPORATION,
 a Delaware corporation
 WESTLAKE PVC CORPORATION,
 a Delaware corporation
 WESTLAKE VINYLS, INC.,
 a
Delaware corporation
 NORTH AMERICAN BRISTOL CORPORATION, 
 a Delaware corporation

			
		 	By:	 	/s/ Albert Chao
		 		 	 
		 		 	Albert Chao
		 		 	President of the above Borrowers

  

 12 

 Signature Page to that certain Seventh Amendment to Credit Agreement dated as of the date first stated above, among
Westlake Chemical Corporation and certain of its domestic subsidiaries, as Borrowers, Bank of America, N.A., in its capacity as Agent, Required Lenders, and Guarantors. 
  

			
	 NORTH AMERICAN PIPE CORPORATION,
 a Delaware corporation
 VAN BUREN PIPE CORPORATION,
 a Delaware corporation
 WESTECH BUILDING PRODUCTS, INC.,
 a Delaware corporation
 WESTECH PROFILES LIMITED,
 a Delaware corporation

		
	 By:
	 	/s/ Wayne D. Morse
		 	 
		 	Wayne D. Morse
		 	President of the above Borrowers

  

 13 

 Signature Page to that certain Seventh Amendment to Credit Agreement dated as of the date first stated above, among
Westlake Chemical Corporation and certain of its domestic subsidiaries, as Borrowers, Bank of America, N.A., in its capacity as Agent, Required Lenders, and Guarantors. 
  

					
	 WESTLAKE VINYLS COMPANY LP,
 a Delaware limited partnership

		
	 By:
	 	GVGP, Inc., its general partner
			
		 	By:	 	/s/ Albert Chao
		 		 	 
		 		 	Albert Chao
		 		 	President of the general partner of the above Borrower

			
	
	 WESTLAKE PETROCHEMICALS LLC,
 a Delaware limited liability company

	
	 WESTLAKE POLYMERS LLC,
 a Delaware limited liability company

	
	 WESTLAKE STYRENE LLC,
 a Delaware limited liability company

	
	 WPT LLC,
 a Delaware limited liability company

		
	 By:
	 	Westlake Chemical Investments, Inc., its manager
		
	 By:
	 	/s/ Albert Chao
		 	 
		 	Albert Chao
		 	President of the manager of the above Borrowers

  

 14 

 Signature Page to that certain Seventh Amendment to Credit Agreement dated as of the date first stated above, among
Westlake Chemical Corporation and certain of its domestic subsidiaries, as Borrowers, Bank of America, N.A., in its capacity as Agent, Required Lenders, and Guarantors. 
  

					
	GUARANTORS:
		
		 	GVGP, INC., a Delaware corporation
		 	 WESTLAKE CHEMICAL INVESTMENTS, INC.,
 a Delaware corporation
 WESTLAKE ETHYLENE PIPELINE CORPORATION,
 a Delaware corporation
 WESTLAKE MANAGEMENT SERVICES, INC.,
 a Delaware corporation
 WESTLAKE OLEFINS CORPORATION,
 a Delaware corporation
 WESTLAKE RESOURCES CORPORATION,
 a Delaware corporation
 WESTLAKE VINYL CORPORATION,
 a Delaware corporation
 WESTLAKE SUPPLY AND TRADING COMPANY,

a Delaware corporation
 WESTLAKE NG I CORPORATION,
 a Delaware corporation
 WESTLAKE LONGVIEW CORPORATION,
 a Delaware corporation

			
		 	By:	 	/s/ Albert Chao
		 		 	 
		 		 	Albert Chao
		 		 	President of the above Guarantors

  

 15 

 Signature Page to that certain Seventh Amendment to Credit Agreement dated as of the date first stated above, among
Westlake Chemical Corporation and certain of its domestic subsidiaries, as Borrowers, Bank of America, N.A., in its capacity as Agent, Required Lenders, and Guarantors. 
  

			
	 GEISMAR HOLDINGS, INC., a Delaware corporation
 WESTLAKE DEVELOPMENT CORPORATION,
 a Delaware corporation

		
	 By:
	 	/s/ R. Michael Looney
		 	 
		 	R. Michael Looney
		 	President of the above Guarantors

  

 16

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