Ch2m Hill Inc., Englewood, Colorado, is awarded a $68,000,000 cost-plus-award-fee modification to increase the maximum dollar value of an indefinite-delivery/indefinite-quantity contract for comprehensive long-term environmental architect-engineering services on Navy and Marine Corps installations at sites in the Naval Facilities Engineering Command (NAVFAC) Atlantic area of responsibility. The work to be performed provides for architectural and engineering services to provide program management and technical environmental services in support of the Department of the Navy’s Environmental Restoration Program, Munitions Response Program, and other similar programs at any Navy and Marine Corps activity in the area of responsibility covered by NAVFAC Atlantic. After award of this modification, the total cumulative contract value will be $308,000,000. Work will be performed primarily in Puerto Rico (35 percent); California (18 percent); Virginia (15 percent); Washington (12 percent), North Carolina (8 percent); Maryland (7 percent); Mississippi (3 percent); and Washington, District of Columbia (2 percent), and is expected to be completed by March 2020. No funds will be obligated at time of award; funds will be obligated on individual task orders as they are issued. Task orders will be primarily funded by environmental restoration, (Navy). The contractor was chosen using federal acquisition regulation Part 36, Architect-Engineer Services on an unrestricted basis. The Naval Facilities Engineering Command, Atlantic, Norfolk, Virginia, is the contracting activity (contract number N62470-16-D-9000).