EX-4.15



 Exhibit 4.15 





 
 OFFICE OF THE SECRETARY OF STATE 

STATE OF OKLAHOMA 
 GREAT SEAL OF THE STATE OF OKLAHOMA 1907 

CERTIFICATE 
 OF 
 LIMITED LIABILITY COMPANY 

WHEREAS, the Articles of Organization of 
 KEYSTONE ROCK & EXCAVATION, L.L.C. 
 an
Oklahoma limited liability company has been filed in the office of the Secretary of State as provided by the laws of the State of Oklahoma. 
 NOW THEREFORE, I, the undersigned, Secretary of State of the State of Oklahoma, by virtue of the powers vested in me by law, do hereby issue this certificate evidencing such filing.

 IN TESTIMONY WHEREOF, I hereunto set my hand and cause to be affixed the Great Seal of the State of Oklahoma.

 Filed in the city of Oklahoma City this 30th day of June, 2010. 

Secretary of State 
 GREAT SEAL OF THE STATE OF OKLAHOMA 1907 







 



 
  

FILED-Oklahoma Secretary of State #3512278091 06/30/2010 10:42 

SOS 
 14772000002 
 ARTICLES OF
ORGANIZATION OF 
 KEYSTONE ROCK & EXCAVATION. L.L.C. 

The undersigned, as sole organizer of a limited liability company, does hereby adopt the following Articles of
Organization of Keystone Rock & Excavation, L.L.C., pursuant to the Oklahoma Limited Liability Company Act, as amended from time to time (the “Act”): 

	 1.
	  
	 Name. The name of the company is Keystone Rock & Excavation, L.L.C. (the “Company”).



 2. Term. The Company will commence on the date of filing of these Articles of Organization
with the Secretary of State of Oklahoma and will continue perpetually until: (a) the dissolution of the Company in accordance with the Act, or (b) the dissolution of the Company in accordance with the provisions of any agreement (the
“Operating Agreement”) among the members of the Company as to the affairs of the Company or the conduct of the Company’s business. 
 3. Purpose. The purpose of the Company is to engage in any lawful act or activity for which limited liability companies may be organized under the Act. 

4. Principal Location. The address of the Company’s principal place of business in the State of Oklahoma is 6100
North Western, Oklahoma City, Oklahoma 73118. 
 5. Resident Agent. The name of the Company’s resident agent
in the State of Oklahoma is The Corporation Company with an address at 1833 South Morgan Road, Oklahoma City, OK 73128. 
 6. Management. The Company will be managed by one or more managers or officers as provided in the Operating Agreement. Such managers will have the continuing exclusive authority to manage
and conduct the business of the Company subject to the restrictions set forth in the Operating Agreement. 
 7.
Limitation of Liability. The members and managers of the Company will not be liable to the Company or its members for monetary damages for the breach of any fiduciary duty or any duty under the Act except personal liability for: (a) the breach
of the duty of loyalty to the Company or the Company’s members; (b) acts or omissions by such manager or member which are not in good faith, involve intentional misconduct or involve a knowing violation of law; or (c) any transaction
for which the manager or the member derived an improper personal benefit. No amendment or repeal of this paragraph 7 will apply to or have any effect on the liability or alleged liability of any member or manager for or with respect to any acts or
omissions of such member or manager occurring prior to such amendment or repeal. 







 



 
  
 8.
indemnity. The Company will indemnify any person who is a party or is threatened to be made a party to any threatened, pending or completed action, suit or proceeding whether civil, criminal, administrative or investigative by reason of the fact
that such person is or was a manager, member, employee or agent of the Company or is or was serving at the request of the Company as a director, officer, manager, employee or agent of another corporation, partnership, joint venture or other
enterprise against expenses (including attorneys’ fees), judgments, fines and amounts paid in settlement actually and reasonably incurred by such person in connection with such action, suit or proceeding, if such person acted in good faith and
in a manner reasonably believed to be in or not opposed to the best interest of the Company. The termination of any such proceeding by judgment, order, settlement, conviction or plea of nolo contendere or its equivalent will not create a presumption
that the person did not act in good faith and in a manner reasonably believed to be in or not opposed to the best interest of the Company. With respect to a suit by or in the right of the Company to procure a judgment in its favor, the right of
indemnification under this paragraph will be limited to the same extent as derivative actions on behalf of a corporation under the Oklahoma General Corporation Act. Each person is entitled, without demand on the Company or any action by the Company,
to enforce the foregoing indemnity in an action at law against the Company. The foregoing right of indemnification is not exclusive of any rights to which any such person may now or hereafter be otherwise entitled. 

THE UNDERSIGNED has executed these Articles of Organization this 30th day of June, 2010. 

Anita L. Brodrick, Sole Organizer