EX-4.12



 Exhibit 4.9 
 AMENDMENT NO. 4 TO
 MASTER NOTE PURCHASE AGREEMENT 

This AMENDMENT NO. 4 TO MASTER NOTE PURCHASE AGREEMENT, dated as of August 9, 2013 (this
“Amendment”), is by and among (a) Waste Connections, Inc., a Delaware corporation (the “Company”), each Subsidiary of the Company from time to time party to the Purchase Agreement referred to below (the
“Subsidiaries,” and the Company and the Subsidiaries are each referred to herein as an “Obligor” and, collectively, the “Obligors”), and (b) each of the purchasers from time to time party to
the Purchase Agreement referred to below (each a “Purchaser” and, collectively, the “Purchasers”). Capitalized terms used herein without definition shall have the meanings assigned to such terms in the Purchase
Agreement referred to below. 
 WHEREAS, the Obligors and the Purchasers are parties to that certain Master Note
Purchase Agreement, dated as of July 15, 2008, as amended by that certain Amendment No. 1 to Master Note Purchase Agreement dated as of July 20, 2009, Amendment No. 2 to Master Note Purchase Agreement dated as of
November 24, 2010 and Amendment No. 3 to Master Note Purchase Agreement dated as of October 12, 2011 (as amended, amended and restated, supplemented or otherwise modified from time to time, the “Purchase Agreement”);
and 
 WHEREAS, the Obligors and the Holders pursuant to Section 17.1(a) of the Purchase Agreement desire to amend,
among other sections of the Purchase Agreement, Section 1.2 in the Purchase Agreement to increase the maximum aggregate principal amount of Notes that may be issued pursuant to the Purchase Agreement from $750,000,000 to $1,250,000,000;

 NOW THEREFORE, in consideration of the mutual agreements contained in the Purchase Agreement and herein and for other
good and valuable consideration, the receipt and sufficiency of which are hereby acknowledged, the parties hereto hereby agree as follows: 
 §1.1 Amendment to Section 1.2 of the Purchase Agreement. Section 1.2 of the Purchase Agreement is hereby amended by deleting the amount “$750,000,000” and replacing
it with the amount “$1,250,000,000”. 
 §1.2 Amendment to Section 7 of the Purchase Agreement.
Section 7 of the Purchase Agreement is hereby amended by adding a new Section 7.4 that shall read as follows: 
 “Section 7.4. Electronic Delivery. Financial statements, opinions of independent certified public accountants, other information and Officer’s Certificates that are required to be
delivered by the Company pursuant to Sections 7.1(a), (b) or (c) and Section 7.2 shall be deemed to have been delivered if the Company satisfies any of the following requirements with respect thereto: 

(i) such financial statements satisfying the requirements of Section 7.1(a) or (b) and related Officer’s
Certificate satisfying the requirements of Section 7.2 are delivered to each holder of a Note by e-mail; 

(ii) the Company shall have timely filed such Form 10–Q or Form 10–K, satisfying the requirements of
Section 7.1(a) or Section 7.1(b), as the case may be, with the SEC on EDGAR and shall have made such form and the related Officer’s Certificate satisfying the requirements of Section 7.2 available on its home page on the
internet, which is located at http://www.wasteconnections.com as of the date of this Agreement; 







 (iii) such financial statements satisfying the requirements of
Section 7.1(a) or Section 7.1(b) and related Officer’s Certificate(s) satisfying the requirements of Section 7.2 are timely posted by or on behalf of the Company on IntraLinks or on any other similar website to which each holder
of Notes has free access; or 
 (iv) the Company shall have filed any of the items referred to in
Section 7.1(c) with the SEC on EDGAR and shall have made such items available on its home page on the internet or on IntraLinks or on any other similar website to which each holder of Notes has free access; 

provided however, that in the case of any of clauses (ii), (iii) or (iv), the Company shall have given each holder of a Note
prior written notice, which may be by e-mail or in accordance with Section 18, of such posting or filing in connection with each delivery, provided further, that upon request of any holder to receive paper copies of such forms, financial
statements and Officer’s Certificates or to receive them by e-mail, the Company will promptly e-mail them or deliver such paper copies, as the case may be, to such holder. 
 In the event that as a condition to receiving access to information relating to the Company or its Subsidiaries in connection with the transactions contemplated by or otherwise pursuant to this Agreement,
any Purchaser or holder of a Note is required to agree to a confidentiality undertaking (whether through IntraLinks, another secure website, a secure virtual workspace or otherwise) which is different from Section 20, Section 20 shall not
be amended thereby and, as between such Purchaser or such holder and the Company, Section 20 shall supersede any such other confidentiality undertaking.” 
 §1.3 Amendment to Section 8.2 of the Purchase Agreement. Section 8.2 of the Purchase Agreement is hereby amended by amending and restating the second sentence of
Section 8.2 as follows: 
 “The Company will give each holder of Notes written notice of each optional prepayment under
this Section 8.2 not less than ten days and not more than 60 days prior to the date fixed for such prepayment unless the Company and the Required Holders agree to another time period pursuant to Section 17.” 

§1.4 Amendment to Section 8.2 of the Purchase Agreement. Section 8.2 of the Purchase Agreement is hereby
amended by adding the following phrase after the first reference to the term “Make-Whole Amount” in Section 8.2: 

“plus the LIBOR Breakage Amount (unless the date of prepayment is an Interest Payment Date)” 

  
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 §1.5 Amendment to Section 8.7(e) of the Purchase Agreement.
Section 8.7(e) of the Purchase Agreement is hereby amended by adding the following phrase at the end of the first sentence in Section 8.7(e): 
 “plus the LIBOR Breakage Amount (unless the date of prepayment is an Interest Payment Date)” 
 §1.6 Amendment to Section 10.9 of the Purchase Agreement. Section 10.9 of the Purchase Agreement is hereby amended by replacing “Closing Date” with “Fourth
Amendment Effective Date”. 
 §1.7 Amendment to Section 10.15 of the Purchase Agreement.
Section 10.15 of the Purchase Agreement is hereby amended and restating Section 10.15 in its entirety as follows: 
 “Section 10.15. Terrorism Sanctions Regulations. The Company will not and will not permit any Controlled Entity (a) to become (including by virtue of being owned or controlled by a
Blocked Person), own or control a Blocked Person or any Person that is the target of sanctions imposed by the United Nations or by the European Union, or (b) directly or indirectly to have any investment in or engage in any dealing or
transaction (including, without limitation, any investment, dealing or transaction involving the proceeds of the Notes) with any Person if such investment, dealing or transaction (i) would cause any holder to be in violation of any law or
regulation applicable to such holder relating to U.S. Economic Sanctions or sanctions imposed by the United Nations or the European Union, or (ii) is prohibited by or subject to sanctions under any U.S. Economic Sanctions, or (c) to
engage, nor shall any Affiliate of either engage, in any activity that could subject such Person or any holder to sanctions under CISADA or any similar law or regulation with respect to Iran or any other country that is subject to U.S. Economic
Sanctions.” 
 §1.8 Amendment to Section 11(b) of the Purchase Agreement. Section 11(b) of the
Purchase Agreement is hereby amended by adding the following after the phrase “on any Note” in Section 11(b): 

“or any LIBOR Breakage Amount” 
 §1.9 Amendment to Section 12.1(c) of the Purchase Agreement. Section 12.1(c) of the Purchase Agreement is hereby amended by adding the following phrase after the first
reference to the term “Make-Whole Amount” in the second paragraph in Section 12.1(c): 
 “and LIBOR Breakage
Amount” 
 §1.10 Amendment to Section 12.3 of the Purchase Agreement. Section 12.3 of the
Purchase Agreement is hereby amended by adding the following phrase after each reference to the phrases “Make-Whole Amount, if any,” in Section 12.3: 
 “and LIBOR Breakage Amount, if any,” 
 §1.11 Amendment to
Section 13.1 of the Purchase Agreement. Section 13.1 of the Purchase Agreement is hereby amended by adding the following parenthetical after “name and address” in the second and third line of Section 13.1:

 “(including e-mail address, if applicable)” 

  
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 §1.12 Amendment to Section 17.1(a) of the Purchase Agreement.
Section 17.1(a) of the Purchase Agreement is hereby amended by adding the following parenthetical after the reference to Section 8 in clause (C) of Section 17.1(a): 

“(except as set forth in the second sentence of Section 8.2)” 

§1.13 Amendment to Section 18 of the Purchase Agreement. Section 18 of the Purchase Agreement is hereby
amended by replacing the first word of Section 18 with the following: 
 “Except the extent otherwise provided in
Section 7.4, all” 
 §1.14 Amendment to Section 22 of the Purchase Agreement. Section 22
of the Purchase Agreement is hereby amended by adding a new Section 22.10 as follows: 

“Section 22.10. Disregarded Fair Value Option. For purposes of determining compliance with this Agreement
(including, without limitation, Section 9, Section 10 and the definition of “Indebtedness”), any election by the Company to measure any financial liability using fair value (as permitted by Financial Accounting Standards
Board Accounting Standards Codification Topic No. 825-10-25 – Fair Value Option, International Accounting
Standard 39 – Financial Instruments: Recognition and Measurement or any similar accounting standard) shall be disregarded and such determination shall be made as if such election had not been made.” 

§1.16 Amendment to Schedule B of the Purchase Agreement. Schedule B of the Purchase Agreement is hereby amended by
adding the following definitions in alphabetical order in Schedule B of the Purchase Agreement: 
 “Adjusted LIBOR
Rate” means for each Interest Period with respect to any Floating Rate Note a rate per annum equal to the rate set forth in the applicable Supplement pursuant to which such Floating Rate Notes is issued. 

“Blocked Person” means (i) a Person whose name appears on the list of Specially Designated Nationals and Blocked
Persons published by the Office of Foreign Assets Control, United States Department of the Treasury (“OFAC”) (an “OFAC Listed Person”) (ii) an agent, department, or instrumentality of, or Person beneficially
owned by, controlled by or acting on behalf of, directly or indirectly, (x) any OFAC Listed Person or (y) any Person, entity, organization, foreign country or regime that is subject to any OFAC Sanctions Program, or (iii) a Person
otherwise blocked, subject to sanctions under or engaged in any activity in violation of other United States economic sanctions, including but not limited to, the Trading with the Enemy Act, the International Emergency Economic Powers Act, CISADA or
any similar law or regulation with respect to Iran or any other country, the Sudan Accountability and Divestment Act, any OFAC Sanctions Program, or any economic sanctions regulations administered and enforced by the United States or any enabling
legislation or executive order relating to any of the foregoing (collectively, “U.S. Economic Sanctions”). 

  
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 “CISADA” means the Comprehensive Iran Sanctions, Accountability and
Divestment Act. 
 “Controlled Entity” means (i) any of the Subsidiaries of the Company and any of their or
the Company’s respective Controlled Affiliates and (ii) if the Company has a parent company, such parent company and its Controlled Affiliates. As used in this definition, “Control” means the possession, directly or
indirectly, of the power to direct or cause the direction of the management and policies of a Person, whether through the ownership of voting securities, by contract or otherwise. 

“EDGAR” means the SEC’s Electronic Gathering, Analysis and Retrieval System or any successor SEC electronic filing
system for such purposes. 
 “Floating Rate Note” means any Note issued under this Agreement with a floating
interest rate and not a fixed interest rate.  
 “Fourth Amendment” means the Amendment No. 4 to
Master Note Purchase Agreement, dated as of August 9, 2013, among the Company, the Obligors and the Purchasers. 

“Fourth Amendment Effective Date” means the date of execution of the Fourth Amendment. 

“Interest Payment Date” means, with respect to any Floating Rate Note, the dates set forth in the applicable Supplement
pursuant to which such Floating Rate Notes are issued. 
 “Interest Period” means, with respect to any Floating
Rate Note, the period commencing on the issuance date of such Floating Rate Note and continuing up to, but not including, the first Interest Payment Date and, thereafter, the period commencing on the next succeeding Interest Payment Date and
continuing up to, but not including, the next Interest Payment Date. 
 “LIBOR” shall mean, for any Interest
Period, the rate per annum (rounded upwards, if necessary, to the next higher one hundred-thousandth of a percentage point) for deposits in U.S. Dollars for a three (3) month period which appears on the
Bloomberg Financial Markets Service Page BBAM-1 (or if such page is not available, the Reuters Screen LIBO Page) as of 11:00 a.m. (London, England time) on the date two Business Days before the
commencement of such Interest Period. “Reuters Screen LIBO Page” means the display designated as the “LIBO” page on the Reuters Monitory Money Rates Service (or such other page as may replace the LIBO page on that service
or such other service as may be nominated by the British Bankers’ Association as the information vendor for the purpose of displaying British Banker’s Association Interest Settlement Rates for U.S. Dollar deposits). 

  
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 “LIBOR Breakage Amount” shall mean any loss, cost or expense (other than
lost profits) actually incurred by any holder of a Floating Rate Note as a result of any payment or prepayment of any Floating Rate Note on a day other than a regularly scheduled Interest Payment Date for such Floating Rate Note or at the scheduled
maturity (whether voluntary, mandatory, automatic, by reason of acceleration or otherwise), and any loss or expense arising from the liquidation or reemployment of funds obtained by it or from fees payable to terminate the deposits from which such
funds were obtained, provided that any such loss, cost or expense shall be limited to the time period from the date of such prepayment through the earlier of (i) the next Interest Payment Date, or (ii) the maturity date of the
Notes. Each holder shall determine the LIBOR Breakage Amount with respect to the principal amount of its Floating Rate Notes then being paid or prepaid (or required to be paid or prepaid) by written notice to the Company that issued such Floating
Rate Note setting forth such determination in reasonable detail not less than two Business Days prior to the date of prepayment in the case of any prepayment pursuant to Section 8.2(a) and not less than one Business Day in the case of any
payment required by Section 12.1. Each such determination shall be presumptively correct absent manifest error. 

“OFAC” is defined in the defined term “Blocked Person”. 

“OFAC Listed Person” is defined in the defined term “Blocked Person”. 

“OFAC Sanctions Program” means any economic or trade sanction that OFAC is responsible for administering and enforcing. A
list of OFAC Sanctions Programs may be found at http://www.treasury.gov/resource-center/sanctions/Programs/Pages/Programs.aspx. 
 “USA PATRIOT Act” means United States Public Law 107-56, Uniting and Strengthening America by Providing Appropriate Tools Required to Intercept and
Obstruct Terrorism (USA PATRIOT ACT) Act of 2001, as amended from time to time, and the rules and regulations promulgated thereunder from time to time in effect. 
 “U.S. Economic Sanctions” is defined in the defined term “Blocked Person”. 
 §2. Representations and Warranties. Each Obligor hereby represents and warrants to the Purchasers as follows: 
 (a) The execution and delivery by such Obligor of this Amendment and the performance by such Obligor of its obligations and agreements under this Amendment and the Purchase Agreement as amended hereby are
within the corporate authority of such Obligor, have been duly authorized by all necessary corporate proceedings on behalf of such Obligor, and do not and will not contravene any provision of law, statute, rule or regulation to which such Obligor is
subject or such Obligor’s constitutive documents or of any agreement or other instrument binding upon such Obligor. 

  
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 (b) Each of this Amendment and the Purchase Agreement as amended hereby constitutes the
legal, valid and binding obligation of such Obligor, enforceable in accordance with its respective terms, except as limited by bankruptcy, insolvency, reorganization, moratorium or other laws relating to or affecting generally the enforcement of
creditors’ rights. 
 (c) No approval or consent of, or filing with, any governmental agency or authority is required to
make valid and legally binding the execution, delivery or performance by such Obligor of this Amendment or the Purchase Agreement as amended hereby. 
 (d) Such Obligor has performed and complied in all material respects with all terms and conditions herein and in the Purchase Agreement required to be performed or complied with by such Obligor prior to
or at the time hereof, and as of the date hereof, after giving effect to the provisions hereof, there exists no Default or Event of Default. 
 §3. Conditions Precedent. This Amendment shall become effective as of the date on which all of the following shall have occurred (and shall not be effective until the date on which all
of the following shall have occurred): each of the Obligors and the Holders shall have duly executed and delivered a copy of this Amendment. 
 §4. Miscellaneous Provisions. 
 (a) Except as otherwise
expressly provided by this Amendment, all of the terms, conditions and provisions of the Purchase Agreement and the Notes shall remain unchanged and in full force and effect. It is declared and agreed by each of the parties hereto that the Purchase
Agreement and the Notes, as amended hereby, shall continue in full force and effect, and that this Amendment and the Purchase Agreement shall be read and construed as a single instrument. 

(b) The amendments set forth herein are effective solely for the purposes set forth herein and shall be limited precisely as written.
Except as expressly provided herein, this Amendment shall not be deemed to (i) be a consent to any amendment, waiver or modification of any other term or condition of the Purchase Agreement or any Note, or (ii) operate as a waiver or
otherwise prejudice any right, power or remedy that the Purchasers may now have or may have in the future under or in connection with the Purchase Agreement or the Notes, except as specifically set forth herein. 

(c) This Amendment may be executed in any number of counterparts, but all such counterparts shall together constitute but one instrument.
In making proof of this Amendment, it shall not be necessary to produce or account for more than one counterpart signed by each party hereto by and against which enforcement hereof is sought. Photocopies, facsimile transmissions, or email
transmissions of Adobe portable document format files (also known as “PDF” files) of signatures shall be deemed original signatures and shall be fully binding on the parties to the same extent as original signatures. 

§5. Governing Law. This Amendment shall be construed and enforced in accordance with, and the rights of the parties
shall be governed by, the law of the State of New York, excluding choice-of-law principles of the law of such State that would permit the application of the laws of a jurisdiction other than such State. 

[Remainder of page intentionally left blank] 

  
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 IN WITNESS WHEREOF, the parties have executed this Amendment as of the date first
above written. 
 THE OBLIGORS: 

WASTE CONNECTIONS, INC. 
 ADVANCED SYSTEMS PORTABLE RESTROOMS, INC. 
 ALASKA
WASTE-INTERIOR, LLC 
 ALASKA WASTE-KENAI PENINSULA, LLC 

ALASKA WASTE MAT-SU, LLC 
 AMERICAN DISPOSAL COMPANY, INC. 
 AMERICAN SANITARY SERVICE, INC.

 ANDERSON COUNTY LANDFILL, INC. 

ANDERSON REGIONAL LANDFILL, LLC 

BITUMINOUS RESOURCES, INC. 
 BRENT RUN LANDFILL, INC. 
 BROADACRE LANDFILL, INC. 

BUTLER COUNTY LANDFILL, INC. 
 CALPET, LLC 
 CAMINO REAL ENVIRONMENTAL CENTER, INC. 

CAPITAL REGION LANDFILLS, INC. 

CARPENTER WASTE HOLDINGS, LLC 
 CHAMBERS DEVELOPMENT OF NORTH CAROLINA, INC. 
 CHIQUITA CANYON,
INC. 
 CHIQUITA CANYON, LLC 

CLIFTON ORGANICS, LLC 
 COLD CANYON LAND FILL, INC. 
 COLUMBIA RESOURCE CO., L.P.

 COMMUNITY REFUSE DISPOSAL INC. 

CONTRACTORS WASTE SERVICES, INC. 

CORRAL DE PIEDRA LAND COMPANY 
 COUNTY WASTE — ULSTER, LLC 
 COUNTY WASTE AND RECYCLING
SERVICE, INC. 
 COUNTY WASTE TRANSFER CORP. 

CRI HOLDINGS, LLC 
 CURRY TRANSFER & RECYCLING, INC. 
 D. M. DISPOSAL CO.,
INC. 
 DELTA CONTRACTS, LLC 

DENVER REGIONAL LANDFILL, INC. 

DIVERSIFIED BUILDINGS, L.L.C. 
 EL PASO DISPOSAL, LP 
 ELKO SANITATION COMPANY 

EMPIRE DISPOSAL, INC. 
 ENVIRONMENTAL TRUST COMPANY 
 ENTECH ALASKA LLC 

EVERGREEN DISPOSAL, INC. 
 FINLEY-BUTTES LIMITED PARTNERSHIP 
 FINNEY COUNTY LANDFILL, INC.

 FORT ANN TRANSFER STATION, LLC 

FRONT RANGE LANDFILL, INC. 
 G & P DEVELOPMENT, INC. 
 GREEN WASTE SOLUTIONS OF ALASKA,
LLC 
 HARDIN SANITATION, INC. 

  
 [Signature
page to Amendment No. 4 to Master Note Purchase Agreement] 








 HAROLD LEMAY ENTERPRISES, INCORPORATED 

HIGH DESERT SOLID WASTE FACILITY, INC. 

HUDSON VALLEY WASTE HOLDING, INC. 

ISLAND DISPOSAL, INC. 
 J BAR J LAND, INC. 
 LACASSINE HOLDINGS, L.L.C. 

LAKESHORE DISPOSAL, INC. 
 LAUREL RIDGE LANDFILL, L.L.C. 
 LEALCO, INC. 

LFC, INC. 
 MADERA DISPOSAL SYSTEMS, INC. 
 MAMMOTH DISPOSAL COMPANY

 MANAGEMENT ENVIRONMENTAL NATIONAL, INC. 

MASON COUNTY GARBAGE CO., INC. 

MBO, LLC 
 MDSI OF LA, INC. 
 MILLENNIUM WASTE INCORPORATED 

MISSION COUNTRY DISPOSAL 
 MORRO BAY GARBAGE SERVICE 
 MURREY’S DISPOSAL COMPANY, INC.

 NEBRASKA ECOLOGY SYSTEMS, INC. 

NOBLES COUNTY LANDFILL, INC. 
 NORTHWEST CONTAINER SERVICES, INC. 
 OKLAHOMA CITY WASTE
DISPOSAL, INC. 
 OKLAHOMA LANDFILL HOLDINGS, INC. 

OSAGE LANDFILL, INC. 
 PIERCE COUNTY RECYCLING, COMPOSTING AND DISPOSAL, LLC 
 POTRERO
HILLS LANDFILL, INC. 
 PRAIRIE DISPOSAL, LLC 

PRAIRIE LIQUIDS, LLC 
 PSI ENVIRONMENTAL SERVICES, INC. 
 PSI ENVIRONMENTAL SYSTEMS,
INC. 
 R360 ARTESIA, LLC 

R360 CLACO, LLC 
 R360 ENVIRONMENTAL SOLUTIONS, LLC 
 R360 ENVIRONMENTAL SOLUTIONS
HOLDINGS, INC. 
 R30 ENVIRONMENTAL SOLUTIONS OF LOUISIANA, LLC 

R360 ENVIRONMENTAL SOLUTIONS OF TEXAS, LLC 

R360 ES HOLDINGS, INC. 
 R360 HITCHCOCK, LLC 
 R360 LOGISTICS, LLC 

R360 OKLAHOMA, LLC 
 R360 PERMIAN BASIN, LLC 
 R360 SHUTE CREEK, LLC 

R360 SILO, LLC 
 R360 WILLISTON BASIN, LLC 
 R.A. BROWNRIGG INVESTMENTS, INC.

 R.J.C. TRUCKING CO. 

RAILROAD AVENUE DISPOSAL, LLC 
 RED CARPET LANDFILL, INC. 
 RH FINANCIAL CORPORATION 

RICH VALLEY, LLC 

  
 [Signature
page to Amendment No. 4 to Master Note Purchase Agreement] 








 RKS HOLDING, CORP. 

SAN LUIS GARBAGE COMPANY 
 SANIPAC, INC. 
 SCOTT SOLID WASTE DISPOSAL COMPANY 

SCOTT WASTE SERVICES, LLC 
 SEABREEZE RECOVERY, INC. 
 SEDALIA LAND COMPANY 

SIERRA HOLDING GROUP, LLC 
 SIERRA PROCESSING, LLC 
 SILVER SPRINGS ORGANICS L.L.C.

 SJ RECLAMATION, INC. 

SKB ENVIRONMENTAL, INC. 
 SKB (AUSTIN) ENVIRONMENTAL, LLC 
 SKB RECYCLING, LLC 

SOUTH COUNTY SANITARY SERVICE, INC. 

STERLING AVENUE PROPERTIES, LLC 

STUTZMAN REFUSE DISPOSAL INC. 
 TACOMA RECYCLING COMPANY, INC. 
 TENNESSEE WASTE MOVERS, INC.

 US LIQUIDS OF LA, L.P. 

VOORHEES SANITATION, L.L.C. 
 WASCO COUNTY LANDFILL, INC. 
 WASTE CONNECTIONS MANAGEMENT
SERVICES, INC. 
 WASTE CONNECTIONS OF ALABAMA, INC. 

WASTE CONNECTIONS OF ALASKA, INC. 

WASTE CONNECTIONS OF ARIZONA, INC. 

WASTE CONNECTIONS OF ARKANSAS, INC. 

WASTE CONNECTIONS OF CALIFORNIA, INC. 

WASTE CONNECTIONS OF CANADA HOLDINGS, INC. 

WASTE CONNECTIONS OF COLORADO, INC. 

WASTE CONNECTIONS OF GEORGIA, INC. 

WASTE CONNECTIONS OF IDAHO, INC. 

WASTE CONNECTIONS OF ILLINOIS, INC. 

WASTE CONNECTIONS OF IOWA, INC. 

WASTE CONNECTIONS OF KANSAS, INC. 

WASTE CONNECTIONS OF KENTUCKY, INC. 

WASTE CONNECTIONS OF LEFLORE, LLC 

WASTE CONNECTIONS OF LOUISIANA, INC. 

WASTE CONNECTIONS OF MTNNESOT A, INC. 

WASTE CONNECTIONS OF MISSISSIPPI DISPOSAL SERVICES, LLC 

WASTE CONNECTIONS OF MISSISSIPPI, INC. 

WASTE CONNECTIONS OF MONTANA, INC. 

WASTE CONNECTIONS OF NEBRASKA, INC. 

WASTE CONNECTIONS OF NEW MEXICO, INC. 

WASTE CONNECTIONS OF NORTH CAROLINA, INC. 

WASTE CONNECTIONS OF OKLAHOMA, INC. 

WASTE CONNECTIONS OF OREGON, INC. 

WASTE CONNECTIONS OF SOUTH CAROLINA, INC. 

WASTE CONNECTIONS OF SOUTH DAKOTA, INC. 

WASTE CONNECTIONS OF TENNESSEE, INC. 

WASTE CONNECTIONS OF TEXAS, LLC 

WASTE CONNECTIONS OF THE CENTRAL VALLEY, INC. 

  
 [Signature
page to Amendment No. 4 to Master Note Purchase Agreement] 








 WASTE CONNECTIONS OF UTAH, INC. 

WASTE CONNECTIONS OF WASHINGTON, INC. 

WASTE CONNECTIONS OF WYOMING, INC. 

WASTE CONNECTIONS TRANSPORTATION COMPANY, INC. 

WASTE REDUCTION SERVICES, L.L.C. 

WASTE SERVICES OF N.E. MISSISSIPPI, INC. 

WASTE SOLUTIONS GROUP OF SAN BENITO, LLC 

WCI-WHITE OAKS LANDFILL, INC. 
 WEST BANK ENVIRONMENTAL SERVICES, INC. 
 WEST COAST RECYCLING AND
TRANSFER, INC. 
 WYOMING ENVIRONMENTAL SERVICES, INC. 

YAKIMA WASTE SYSTEMS, INC. 
  

							
		 		 	By:	 	 /s/ Worthing F. Jackman

		 		 		 	Name: Worthing F. Jackman
		 		 		 	Title: Chief Financial Officer


  
 [Signature
page to Amendment No. 4 to Master Note Purchase Agreement] 









			
	 PURCHASERS:

	
	 METROPOLITAN LIFE INSURANCE COMPANY

		
	 By:
	 	 METROPOLITAN LIFE INSURANCE COMPANY,
 its investment manager

		
	By:	 	 /s/ Judith A. Gulotta

		 	Name: Judith A. Gulotta
		 	Title: Managing Director
	
	 We acknowledge that we hold $35,000,000 6.22% Series 2008A Senior Notes due October 1, 2015.

 
 We acknowledge that we hold $65,000,000 5.25% Series 2009A Senior Notes due
November 1, 2019.
  
 We acknowledge that we hold $9,500,000 3.30% Series
2011A Senior Notes, Tranche A, due April 1, 2016.
  
 We acknowledge that
we hold $1,000,000 4.64% Series 2011A Senior Notes, Tranche C, due April 1, 2021.

	  
 GENERAL AMERICAN LIFE INSURANCE
COMPANY

		
	 By:
	 	 METROPOLITAN LIFE INSURANCE COMPANY,
 its investment manager

		
	By:	 	 /s/ Judith A. Gulotta

		 	Name: Judith A. Gulotta
		 	Title: Managing Director
	
	We acknowledge that we hold $10,000,000 6.22% Series 2008A Senior Notes due October 1, 2015.
	
	METLIFE INVESTORS USA INSURANCE COMPANY
		
	 By:
	 	 METROPOLITAN LIFE INSURANCE COMPANY,
 its investment manager

		
	By:	 	 /s/ Judith A. Gulotta

		 	Name: Judith A. Gulotta
		 	Title: Managing Director
	  
 We acknowledge that we hold $20,000,000 5.25% Series
2009A Senior Notes due November 1, 2019.




  
 [Signature
page to Amendment No. 4 to Master Note Purchase Agreement] 








 
			
	 UNION FIDELITY LIFE INSURANCE COMPANY

		
	 By:
	 	 METLIFE INVESTMENT ADVISORS COMPANY,
 its investment advisor

		
	By:	 	 /s/ Judith A. Gulotta

		 	Name: Judith A. Gulotta
		 	Title: Managing Director
	
	 We acknowledge that we hold $15,000,000 5.25% Series 2009A Senior Notes due November 1, 2019.

 
 We acknowledge that we hold $5,000,000 4.64% Series 2011A Senior Notes, Tranche C,
due April 1, 2021.

	
	 METLIFE INSURANCE COMPANY OF CONNECTICUT

		
	 By:
	 	 METROPOLITAN LIFE INSURANCE COMPANY,
 its investment manager

		
	By:	 	 /s/ Judith A. Gulotta

		 	Name: Judith A. Gulotta
		 	Title: Managing Director
	
	 We acknowledge that we hold $1,000,000 4.64% Series 2011A Senior Notes, Tranche C, due April 1,
2016.

	
	 EMPLOYERS REASSURANCE COMPANY

		
	 By:
	 	 METLIFE INVESTMENT ADVISORS COMPANY,
 its investment advisor

		
	By:	 	 /s/ Judith A. Gulotta

		 	Name: Judith A. Gulotta
		 	Title: Managing Director
	
	 We acknowledge that we hold $10,000,000 4.64% Series 2011A Senior Notes, Tranche C, due April 1,
2021.




  
 [Signature
page to Amendment No. 4 to Master Note Purchase Agreement] 








 
					
	PURCHASERS:
	
	NEW YORK LIFE INSURANCE AND ANNUITY CORPORATION
		
	 By:
	 	NEW YORK LIFE INVESTMENT MANAGEMENT LLC, its Investment
Manager

			
		 	By:	 	 /s/ Loyd T. Henderson

		 	Name:	 	Loyd T. Henderson
		 	Title:	 	Senior Director
	
	 We acknowledge that we hold $12,500,000 6.22% Series 2008A Senior Notes due October 1, 2015.

 
 We acknowledge that we hold $51,000,000 5.25% Series 2009A Senior Notes due
November 1, 2019.
  
 We acknowledge that we hold $8,500,000 3.30% Series
2011A Senior Notes, Tranche A, due April 1, 2016.

	
	NEW YORK LIFE INSURANCE COMPANY
			
		 	By:	 	 /s/ Loyd T. Henderson

		 	Name:	 	Loyd T. Henderson
		 	Title:	 	Corporate Vice President
	
	 We acknowledge that we hold $17,500,000 6.22% Series 2008A Senior Notes due October 1, 2015.

 
 We acknowledge that we hold $24,000,000 5.25% Series 2009A Senior Notes due
November 1, 2019.
  
 We acknowledge that we hold $5,100,000 3.30% Series
2011A Senior Notes, Tranche A, due April 1, 2016.

	
	NEW YORK LIFE INSURANCE AND ANNUITY CORPORATION INSTITUTIONALLY OWNED LIFE INSURANCE SEPARATE ACCOUNT (BOLI 3)
		
	 By:
	 	NEW YORK LIFE INVESTMENT MANAGEMENT LLC, Its Investment
Manager

			
		 	By:	 	 /s/ Loyd T. Henderson

		 	Name:	 	Loyd T. Henderson
		 	Title:	 	Senior Director
	
	We acknowledge that we hold $100,000 3.30% Series 2011A Senior Notes, Tranche A, due April 1, 2016.



  
 [Signature
page to Amendment No. 4 to Master Note Purchase Agreement] 








 
					
	PURCHASERS:
	
	NEW YORK LIFE INSURANCE AND ANNUITY CORPORATION INSTITUTIONALLY OWNED LIFE INSURANCE SEPARATE ACCOUNT (BOLI 3-2)
		
	By:	 	 NEW YORK LIFE INVESTMENT MANAGEMENT LLC,
 Its Investment Manager

			
		 	By:	 	 /s/ Loyd T. Henderson

		 	Name:	 	Loyd T. Henderson
		 	Title:	 	Senior Director
	
	We acknowledge that we hold $100,000 3.30% Series 2011A Senior Notes, Tranche A, due April 1, 2016.
	
	NEW YORK LIFE INSURANCE AND ANNUITY CORPORATION INSTITUTIONALLY OWNED LIFE INSURANCE SEPARATE ACCOUNT (BOLI 30C)
		
	By:	 	 NEW YORK LIFE INVESTMENT MANAGEMENT LLC,
 Its Investment Manager

			
		 	By:	 	 /s/ Loyd T. Henderson

		 	Name:	 	Loyd T. Henderson
		 	Title:	 	Senior Director
	
	We acknowledge that we hold $100,000 3.30% Series 2011A Senior Notes, Tranche A, due April 1, 2016.
	
	NEW YORK LIFE INSURANCE AND ANNUITY CORPORATION INSTITUTIONALLY OWNED LIFE INSURANCE SEPARATE ACCOUNT (BOLI 30E)
		
	By:	 	 NEW YORK LIFE INVESTMENT MANAGEMENT LLC,
 Its Investment Manager

			
		 	By:	 	 /s/ Loyd T. Henderson

		 	Name:	 	Loyd T. Henderson
		 	Title:	 	Senior Director
	
	We acknowledge that we hold $100,000 3.30% Series 2011A Senior Notes, Tranche A, due April 1, 2016.



  
 [Signature
page to Amendment No. 4 to Master Note Purchase Agreement] 








 
					
	PURCHASERS:
	
	JACKSON NATIONAL LIFE INSURANCE COMPANY
		
	By:	 	PPM AMERICA, INC., as attorney-in-fact
			
		 	By:	 	 /s/ Elena S. Unger

		 	Name:	 	Elena S. Unger
		 	Title: 	 	Assistant Vice President
	
	We acknowledge that we hold $45,000,000 6.22% Series 2008A Senior Notes due October 1, 2015.



  
 [Signature
page to Amendment No. 4 to Master Note Purchase Agreement] 








 
					
	PURCHASERS:
	
	THE PRUDENTIAL INSURANCE COMPANY OF AMERICA
		
	By:	 	 /s/ Brien F. Davis

	Name:	 	Brien F. Davis
	Title:	 	Vice President
	
	We acknowledge that we hold $36,800,000 6.22% Series 2008A Senior Notes due October 1, 2015.
	
	PRUDENTIAL RETIREMENT INSURANCE AND ANNUITY COMPANY
		
	By:	 	PRUDENTIAL INVESTMENT MANAGEMENT, INC., as investment manager
			
		 	By:	 	 /s/ Brien F. Davis

		 	Name: Brien F. Davis
		 	Title: Vice President
	
	We acknowledge that we hold $8,200,000 6.22% Series 2008A Senior Notes due October 1, 2015.
	
	PHYSICIANS LIFE INSURANCE COMPANY
		
	By:	 	Prudential Private Placement Investors, L.P., as Investment Advisor
		
	By:	 	Prudential Private Placement Investors, Inc., as its General Partner
			
		 	By:	 	 /s/ Brien F. Davis

		 	Name: Brien F. Davis
		 	Title: Vice President
	
	We acknowledge that we hold $1,000,000 3.30% Series 2011A Senior Notes, Tranche A, due April 1, 2016.



  
 [Signature
page to Amendment No. 4 to Master Note Purchase Agreement] 








 
					
	 PURCHASERS:

	
	AMERICAN UNITED LIFE INSURANCE COMPANY
		
	 By:
	 	 AMERICAN UNITED LIFE INSURANCE COMPANY,
 its agent

			
		 	By:	 	 /s/ Michael I. Bullock

		 	Name:	 	Michael I. Bullock
		 	Title:	 	Vice President, Private Placements
	
	We acknowledge that we hold $6,000,000 6.22% Series 2008A Senior Notes due October 1, 2015.
	
	THE STATE LIFE INSURANCE COMPANY
		
	 By:
	 	 AMERICAN UNITED LIFE INSURANCE COMPANY,
 its agent

			
		 	By:	 	 /s/ Michael I. Bullock

		 	Name:	 	Michael I. Bullock
		 	Title:	 	Vice President, Private Placements
	
	We acknowledge that we hold $3,500,000 6.22% Series 2008A Senior Notes due October 1, 2015.
	
	PIONEER MUTUAL LIFE INSURANCE COMPANY
		
	 By:
	 	 AMERICAN UNITED LIFE INSURANCE COMPANY,
 its agent

			
		 	By:	 	 /s/ Michael I. Bullock

		 	Name:	 	Michael I. Bullock
		 	Title:	 	Vice President, Private Placements
	
	We acknowledge that we hold $500,000 6.22% Series 2008A Senior Notes due October 1, 2015.



  
 [Signature
page to Amendment No. 4 to Master Note Purchase Agreement] 








 
			
	 PURCHASERS:

	
	 ALLSTATE LIFE INSURANCE COMPANY

		
	By:	 	  /s/ Ryan Anderson

	Name:	 	      Ryan Anderson
	Title:	 	      Authorized Signatory
		
	By:	 	  /s/ Douglas P. Dupont

	Name:	 	      Douglas P. Dupont
	Title:	 	      Authorized Signatory
	
	 We acknowledge that we hold $10,000,000 3.30% Series 2011A Senior Notes, Tranche A, due April 1,
2016.

	
	 We acknowledge that we hold $11,000,000 4.00% Series 2011A Senior Notes, Tranche B, Due April 1,
2018.

	
	 ALLSTATE INSURANCE COMPANY

		
	By:	 	  /s/ Ryan Anderson

	Name:	 	      Ryan Anderson
	Title:	 	      Authorized Signatory
		
	By:	 	  /s/ Douglas P. Dupont

	Name:	 	      Douglas P. Dupont
	Title:	 	      Authorized Signatory
	
	 We acknowledge that we hold $9,000,000 3.30% Series 2011A Senior Notes, Tranche A, due April 1,
2016.




  
 [Signature
page to Amendment No. 4 to Master Note Purchase Agreement] 








 
					
	PURCHASERS:
	
	MASSACHUSETTS MUTUAL LIFE INSURANCE COMPANY
		
	By:	 	BABSON CAPITAL MANAGEMENT LLC, as investment advisor
			
		 	By:	 	 /s/ Emeka O. Onukwugha





					
		 	Name:	 	Emeka O. Onukwugha
		 	Title:	 	Managing Director
	
	We acknowledge that we hold $24,200,000 4.64% Series 2011A Senior Notes, Tranche C, due April 1, 2021.
	
	C.M. LIFE INSURANCE COMPANY
		
	By:	 	BABSON CAPITAL MANAGEMENT LLC, as investment advisor


 
					
			
		 	By:	 	 /s/ Emeka O. Onukwugha





					
		 	Name:	 	Emeka O. Onukwugha
		 	Title:	 	Managing Director
	
	We acknowledge that we hold $3,800,000 4.64% Series 2011A Senior Notes, Tranche C, due April 1, 2021.



  
 [Signature
page to Amendment No. 4 to Master Note Purchase Agreement] 








 
					
	PURCHASERS:
	
	HARTFORD LIFE INSURANCE COMPANY
		
	By:	 	 HARTFORD INVESTMENT MANAGEMENT COMPANY,
its agent and attorney-in-fact

			
		 	By:	 	 /s/ Dawn M. Crunden





					
		 	Name:	 	Dawn M. Crunden
		 	Title:	 	Senior Vice President
	
	We acknowledge that we hold $12,000,000 3.30% Series 2011A Senior Notes, Tranche A, due April 1, 2016.
	
	HARTFORD CASUALTY INSURANCE COMPANY
		
	By:	 	HARTFORD INVESTMENT MANAGEMENT COMPANY,
its agent and attorney-in-fact


 
					
			
		 	By:	 	 /s/ Dawn M. Crunden





					
		 	Name:	 	Dawn M. Crunden
		 	Title:	 	Senior Vice President
	
	We acknowledge that we hold $13,000,000 3.30% Series 2011A Senior Notes, Tranche A, due April 1, 2016.
	
	HARTFORD LIFE AND ACCIDENT INSURANCE COMPANY
		
	By:	 	HARTFORD INVESTMENT MANAGEMENT COMPANY,
its agent and attorney-in-fact


 
					
			
		 	By:	 	 /s/ Dawn M. Crunden





					
		 	Name:	 	Dawn M. Crunden
		 	Title:	 	Senior Vice President
	
	We acknowledge that we hold $9,000,000 3.30% Series 2011A Senior Notes, Tranche A, due April 1, 2016.



  
 [Signature
page to Amendment No. 4 to Master Note Purchase Agreement] 








 
					
	HARTFORD LIFE AND ANNUITY INSURANCE COMPANY
		
	By:	 	HARTFORD INVESTMENT MANAGEMENT COMPANY,
its agent and attorney-in-fact
			
		 	By:	 	 /s/ Dawn M. Crunden





					
		 	Name:	 	Dawn M. Crunden
		 	Title:	 	Senior Vice President
	
	We acknowledge that we hold $3,000,000 3.30% Series 2011A Senior Notes, Tranche A, due April 1, 2016.



  
 [Signature
page to Amendment No. 4 to Master Note Purchase Agreement] 








 
			
	PURCHASERS:
	
	RIVERSOURCE LIFE INSURANCE COMPANY
		
	By:	 	 /s/ Thomas W. Murphy





			
	Name:	 	Thomas W. Murphy
	Title:	 	Vice President – Investments
	
	 We acknowledge that we hold $17,500,000 3.30% Series 2011A Senior Notes, Tranche A, due April 1, 2016.

 
 We acknowledge that we hold $11,000,000 4.00% Series 2011A Senior Notes, Tranche B,
Due April 1, 2018.

	
	RIVERSOURCE LIFE INSURANCE CO. OF NEW YORK


 
			
		
	By:	 	 /s/ Thomas W. Murphy





			
	Name:	 	Thomas W. Murphy
	Title:	 	Vice President – Investments
	
	We acknowledge that we hold $2,000,000 3.30% Series 2011A Senior Notes, Tranche A, due April 1, 2016.



  
 [Signature
page to Amendment No. 4 to Master Note Purchase Agreement] 








 
			
	PURCHASERS:
	
	THE NORTHWESTERN MUTUAL LIFE INSURANCE COMPANY
		
	By:	 	 /s/ Randal W. Ralph





			
	Name:	 	Randal W. Ralph
	Title:	 	Its Authorized Representative
	
	We acknowledge that we hold $18,000,000 4.00% Series 2011A Senior Notes, Tranche B, Due April 1, 2018.



  
 [Signature
page to Amendment No. 4 to Master Note Purchase Agreement] 








 
			
	PURCHASERS:
	
	KNIGHTS OF COLUMBUS
		
	By:	 	 /s/ Gilles Marchand





			
	Name:	 	Gilles Marchand
	Title:	 	Vice President
	
	 We acknowledge that we hold $5,000,000 4.00% Series 2011A Senior Notes, Tranche B, Due April 1, 2018.

 
 We acknowledge that we hold $12,000,000 4.64% Series 2011A Senior Notes, Tranche C,
Due April 1, 2021.




  
 [Signature
page to Amendment No. 4 to Master Note Purchase Agreement] 








 
			
	PURCHASERS:
	
	MODERN WOODMEN OF AMERICA
		
	By:	 	 /s/ Douglas A. Pannier





			
	Name:	 	Douglas A. Pannier
	Title:	 	Group Head – Private Placements
	
	We acknowledge that we hold $16,000,000 4.64% Series 2011A Senior Notes, Tranche C, Due April 1, 2021.



  
 [Signature
page to Amendment No. 4 to Master Note Purchase Agreement] 








 
			
	PURCHASERS:
	
	 THE PHOENIX INSURANCE COMPANY

		
	 By:
	 	 /s/ Annette M.
Masterson



 
			
	 Name:
	 	 Annette M. Masterson

	 Title:
	 	 Vice President

	
	We acknowledge that we hold $16,000,000 4.64% Series 2011A Senior Notes, Tranche C, Due April 1, 2021.



  
 [Signature
page to Amendment No. 4 to Master Note Purchase Agreement] 








 
			
	PURCHASERS:
	
	LIFE INSURANCE COMPANY OF THE SOUTHWEST
		
	By:	 	 /s/ R. Scott Higgins





			
	Name:	 	R. Scott Higgins
	Title:	 	Senior Vice President
		 	Sentinel Asset Management
	
	 We acknowledge that we hold $5,000,000 4.00% Series 2011A Senior Notes, Tranche B, Due April 1, 2018.

 
 We acknowledge that we hold $7,000,000 4.64% Series 2011A Senior Notes, Tranche C,
Due April 1, 2021.




  
 [Signature
page to Amendment No. 4 to Master Note Purchase Agreement] 








 
			
	PURCHASERS:
	
	COUNTRY LIFE INSURANCE COMPANY
		
	By:	 	 /s/ John A. Jacobs





			
	Name:	 	John A. Jacobs
	Title:	 	Director – Fixed Income
	
	We acknowledge that we hold $3,000,000 4.64% Series 2011A Senior Notes, Tranche C, Due April 1, 2021.
	
	COUNTRY MUTUAL LIFE INSURANCE COMPANY


 
			
		
	By:	 	 /s/ John A. Jacobs





			
	Name:	 	John A. Jacobs
	Title:	 	Director – Fixed Income
	
	We acknowledge that we hold $1,000,000 4.64% Series 2011A Senior Notes, Tranche C, Due April 1, 2021.



  
 [Signature
page to Amendment No. 4 to Master Note Purchase Agreement]