CH2M HILL Internal Market - Trade Announcement

Trade Date - Friday, March 12, 2010

Share Price - USD $40.52

Friday, March 12, 2010, is the next trade date on which you may purchase or sell CH2M HILL stock on the CH2M HILL Internal Market. CH2M HILL common stock will trade at USD $40.52 per share on that date.

If you want to purchase or sell CH2M HILL common stock (or SVEUs) in the next Internal Market trade on March 12, 2010, we (Neidiger Tucker Bruner, Inc.) must receive your request to purchase or sell no later than FRIDAY, March 5, 2010 at 5:00 p.m. Mountain Time. You may send us your request to purchase or sell in any one of the following three ways.

• Mail your purchase or sale request to Neidiger Tucker Bruner, Inc., CH2M HILL Branch, 9191 South Jamaica Street, Englewood, CO 80112.
• Fax your sale request to Neidiger Tucker Bruner, Inc. at 720-286-0803 (no cover sheet is necessary). If you do not receive a confirmation directly from Neidiger Tucker Bruner, Inc. within 24 hours, please call us at (720) 286-2165. Do not rely on your fax machine's automatic confirmation.
• Electronically enter your sale request using the Neidiger Tucker Bruner, Inc. trading pages hosted on the CH2M HILL Employee Ownership Web site. You may access these trading pages at https://webapps.ch2m.com/oicp or through the CH2M HILL Intranet by choosing Employee Resources | My Stock and Options from the toolbar at the top of the Virtual Office.

Please mail your request to purchase or sell as early as possible, or send us your sale request by facsimile or enter it electronically. Also, remember to send us a Neidiger Tucker Bruner, Inc. New Account Application if you have not already done so. You can download a Neidiger Tucker Bruner, Inc. New Account Application from the trading pages hosted on the CH2M HILL Employee Ownership Web site or from our website at www.ntbinc.com/branch.html or you can contact us at (720) 286-2165.

If you participate in the CH2M HILL Payroll Deduction Stock Purchase Plan (PDSPP), you do not need to send us a purchase request; your payroll deductions will automatically be used to purchase CH2M HILL common stock (at a discount), provided you have sent us a Neidiger Tucker Bruner, Inc. New Account Application.

If you plan to sell shares acquired upon exercise of CH2M HILL stock options in the upcoming Internal Market trade, CH2M HILL has informed us that you must exercise those options no later than FRIDAY, February 26, 2010, in order to sell the shares in the upcoming trade. Please contact CH2M HILL's Stock Administrator if you have questions about exercising any of your stock options. Neidiger Tucker Bruner, Inc. is not involved in this process.

If you want to redeem your Stock Appreciation Rights (SARs) or Phantom Stock in this market, CH2M HILL has informed us that they MUST RECEIVE your completed redemption request form(s) by FRIDAY, March 5, 2010.

We (Neidiger Tucker Bruner, Inc.) do not provide any investment advice regarding the suitability of investments in CH2M HILL stock or make any recommendations to purchase, sell, or hold such stock. You must make your own investment decisions or seek advice from your financial advisors. For your information, see CH2M HILL's recent Form 8-K filed with the SEC, which announces the new price of USD $40.52 per share. The following sources may also provide you additional information about CH2M HILL.

• The most recent CH2M HILL Prospectus dated April 21, 2004, as well as CH2M HILL's recent annual, quarterly, and periodic reports filed with the SEC on Forms 10-K, 10-Q, and 8-K, which you can access at the CH2M HILL Employee Ownership Web site or the SEC Web site at http://www.sec.gov.
• The CH2M HILL Employee Ownership Web site. You can access this site at https://webapps.ch2m.com/oicp or through the CH2M HILL Intranet by choosing Employee Resources | My Stock and Options from the toolbar at the top of the Virtual Office.
• The CH2M HILL Owner's Manual, which is also available on CH2M HILL's Employee Ownership Web site.
• Your CH2M HILL Human Resources Department.
• CH2M HILL's Stock Administration, which you may contact by e-mail at o@ch2m.com or by leaving a voicemail at (720) 286-2753.

Sincerely,

Neidiger Tucker Bruner, Inc.