EXHIBIT 10.29

SECOND AMENDMENT

TO

EMPLOYMENT AGREEMENT

WHEREAS, Wheelabrator Technologies, Inc., an indirect subsidiary of Waste Management, Inc., and Mark A. Weidman (“Executive”), and Waste Management, Inc. have made and entered into an Employment Agreement (the“Employment Agreement”) dated May 11, 2006, as amended by the First Amendment to the Employment Agreement;

WHEREAS, both the Company and Executive desire to further amend the Employment Agreement to reflect certain provisions set forth below;

NOW, THEREFORE, the Employment Agreement is further amended in the following respects:

1. Employment Agreement Dated May 11, 2006, as amended by the First Amendment to Employment Agreement. The Company and Executive acknowledge and represent that the Employment Agreement and the First Amendment to Employment Agreement are hereby ratified, affirmed, and amended as set forth herein. WMI shall be and is a party to the Employment Agreement, as amended herein (not in the capacity of employer but solely as set forth in the Employment Agreement and below, and in order for WMI to have power and authority to enforce the provisions of the Employment Agreement, as amended). Capitalized terms herein shall have the same meaning ascribed in the Employment Agreement, as amended, unless defined herein.

2. The following Section 4(f) is added to the Employment Agreement:

(f)    Shanghai Retention Bonus. In the event a Shanghai Sale is consummated on or before June 30, 2014, and during Executive’s Employment Period,

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IN WITNESS WHEREOF, the parties have caused this Second Amendment to be executed on, and effective as of, this 23rd day of December, 2013.

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