ARTICLE ONE

The name of the corporation is CE Philadelphia Real Estate, Inc. (hereinafter called the “Corporation”).

ARTICLE TWO

The address of the Corporation’s registered office in the State of Delaware is Corporation Trust Center, 1209 Orange Street, in the City of Wilmington, County of New Castle. The name of its registered agent at such address is The Corporation Trust Company.

ARTICLE THREE

The purpose of the Corporation is to engage in any lawful act or activity for which corporations may be organized under the General Corporation Law of the State of Delaware.

ARTICLE FOUR

The total number of shares of capital stock which the Corporation shall have the authority to issue is one hundred (100) shares of Common Stock, no par value.

ARTICLE FIVE

The name and the mailing address of the incorporator are as follows:

Name		Address

Matthew R. Perkins		1050 17th St., Suite 1500
		Denver, CO 80265

ARTICLE SIX

The Corporation is to have perpetual existence.

ARTICLE SEVEN

No director shall be personally liable to the Corporation or its stockholders for monetary damages for any breach of fiduciary duty by such person as a director. Notwithstanding the foregoing sentence, a director shall be liable to the extent provided by applicable law (i) for breach of the director’s duty of loyalty to the Corporation or its stockholders, (ii) for acts or omissions not in good faith or which involve intentional misconduct or a knowing violation of law, (iii) pursuant to Section 174 of the Delaware General Corporation Law, or (iv) for any transaction from which the director derived an improper personal benefit. No amendment to or repeal of this Article Seven shall apply to or have any effect on the liability

or alleged liability of any director of the Corporation for or with respect to any acts or omissions of such director occurring prior to such amendment.

ARTICLE EIGHT

Section 1. Nature of Indemnity. Each person who was or is made a party or is threatened to be made a party to or is involved in any action, suit or proceeding, whether civil, criminal, administrative or investigative (hereinafter a “proceeding”), by reason of the fact that he (or a person of which he is the legal representative) is or was a director or officer of the Corporation or is or was serving at the request of the Corporation as a director, officer, employee, fiduciary or agent of another corporation or of a partnership, joint venture, trust or other enterprise, including service with respect to employee benefit plans, whether the basis of such proceeding is alleged action in an official capacity as a director, officer, employee, fiduciary or agent or in any other capacity while serving as a director, officer, employee, fiduciary or agent, shall be indemnified and held harmless by the Corporation to the fullest extent which it is empowered to do so by the General Corporation Law of the State of Delaware, as the same exists or may hereafter be amended (but, in the case of any such amendment, only to the extent that such amendment permits the Corporation to provide broader indemnification rights than said law permitted the Corporation to provide prior to such amendment) against all expense, liability and loss (including attorneys’ fees actually and reasonably incurred by such person in connection with such proceeding) and such indemnification shall inure to the benefit of such person’s heirs, executors and administrators; provided, however, that except as provided in Section 2 of this Article Eight, the Corporation shall not indemnify any such person in connection with a proceeding initiated by such person unless such proceeding was authorized by the Board of Directors of the Corporation. The Corporation may, by action of the Board of Directors, provide indemnification to employees and agents of the Corporation with the same scope and effect as the foregoing indemnification of directors and officers.

Section 2. Procedure for Indemnification of Directors and Officers. Any indemnification of a director or officer of the Corporation under Section I of this Article Eight or advance of expenses under Section 5 of this Article Eight shall be made promptly and, in any event within 30 days, upon the written request of the director or officer. If a determination by the Corporation that the director or officer is entitled to indemnification pursuant to this Article Eight is required, and the Corporation fails to respond within 60 days to a written request for indemnity, the Corporation shall be deemed to have approved the request. If the Corporation denies a written request for indemnification or advancing of expenses, in whole or in part, or if payment in full pursuant to such request is not made within 30 days, the right to indemnification or advances as granted by this Article Eight shall be enforceable by the director or officer in any court of competent jurisdiction. Such person’s costs and expenses incurred in connection with successfully establishing his right to indemnification, in whole or in part, in any such action shall also be indemnified by the Corporation. It shall be a defense to any such action (other than an action brought to enforce a claim for expenses incurred in defending any proceeding in advance of its final disposition where the required undertaking, if any, has been tendered to the Corporation) that the claimant has not met the standards of conduct which make it permissible under the General Corporation Law of the State of Delaware for the Corporation to indemnify

the claimant for the amount claimed, but the burden of such defense shall be on the Corporation. Neither the failure of the Corporation (including the Board of Directors, independent legal counsel or its stockholders) to have made a determination prior to the commencement of such action that indemnification of the claimant is proper in the circumstances because such person met the applicable standard of conduct set forth in the General Corporation Law of the State of Delaware, nor an actual determination by the Corporation (including its Board of Directors, independent legal counsel or its stockholders) that the claimant has not met such applicable standard of conduct, shall be a defense to the action or create a presumption that the claimant has not met the applicable standard of conduct.

Section 3. Nonexclusivity of Article Eight. The rights to indemnification and the payment of expenses incurred in defending a proceeding in advance of its final disposition conferred in this Article Eight shall not be exclusive of any other right which any person may have or hereafter acquire under any statute, certificate of incorporation, bylaw, agreement, vote of stockholders or disinterested directors or otherwise.

Section 4. Insurance. The Corporation may purchase and maintain insurance on its own behalf and on behalf of any person who is or was a director, officer, employee, fiduciary or agent of the Corporation or was serving at the request of the Corporation as a director, officer, employee or agent of another corporation, partnership, joint venture, trust or other enterprise against any liability asserted against such person and incurred by such person in any such capacity, whether or not the Corporation would have the power to indemnify such person against such liability under this Article Eight.

Section 5. Expenses. Unless the Board of Directors shall have determined that a person described in Section 1 of this Article Eight has failed to meet the applicable standard of conduct for indemnification under the Delaware General Corporation Law, expenses incurred by such person in defending a proceeding shall be paid by the Corporation in advance of such proceeding’s final disposition upon receipt of an undertaking by or on behalf of such person to repay such amounts if it shall ultimately be determined that such person is not entitled to be indemnified by the Corporation. Such expenses incurred by other employees and agents may be so paid upon such terms and conditions, if any, as the Board of Directors deems appropriate.

Section 6. Employees and Agents. Persons who are not covered by the foregoing provisions of this Article Eight and who are or were employees or agents of the Corporation, or who are or were serving at the request of the Corporation as employees or agents of another corporation, partnership, joint venture, trust or other enterprise, may be indemnified to the extent authorized at any time or from time to time by the Board of Directors.

Section 7. Contract Rights. The provisions of this Article Eight shall be deemed to be a contract right between the Corporation and each director or officer who serves in any such capacity at any time while this Article Eight and the relevant provisions of the General Corporation Law of the State of Delaware or other applicable law are in effect, and any repeal or modification of this Article Eight or any such law shall not affect any rights or obligations then existing with respect to any state of facts or proceeding then existing.

Section 8. Merger or Consolidation. For purposes of this Article Eight, references to “the Corporation” shall include, in addition to the resulting corporation, any constituent corporation (including any constituent of a constituent) absorbed in a consolidation or merger which, if its separate existence had continued, would have had power and authority to indemnify its directors, officers and employees or agents, so that any person who is or was a director, officer, employee or agent of such constituent corporation, or is or was serving at the request of such constituent corporation as a director, officer, employee or agent of another corporation, partnership, joint venture, trust or other enterprise, shall stand in the same position under this Article Eight with respect to the resulting or surviving corporation as such person would have with respect to such constituent corporation if its separate existence had continued.

ARTICLE NINE

The Corporation reserves the right to amend or repeal any provisions contained in this Certificate of Incorporation from time to time and at any time in the manner now or hereafter prescribed by the laws of the State of Delaware, and all rights conferred upon stockholders and directors are granted subject to such reservation.

ARTICLE TEN

The Board of Directors shall have the power to adopt, amend or repeal the Corporation’s Bylaws, except as may be otherwise be provided in the Bylaws.

ARTICLE ELEVEN

Upon the filing of this Certificate of Incorporation with the Secretary of State of the State of Delaware, the incorporator’s powers as incorporator of the Corporation shall terminate. At such time, the following person shall constitute the initial director of the Corporation, to serve until his successor is duly appointed and shall qualify:

Director		Address

Robert L. King		1 Environmental Way
		Broomfield, CO 80021

I, the undersigned, being the sole incorporator hereinbefore named, for the purpose of forming a corporation in pursuance of the General Corporation Law of the State of Delaware, do make and file this Certificate, hereby declaring and certifying that the facts herein stated are true, and accordingly have hereunto set by hand this 4^th day of February 1999.

	/s/ Matthew R. Perkins
	Matthew R. Perkins, Incorporator