If upon the completion of all landscaping, planting and/or reforestation activities required by this subchapter, and upon the completion of any funds transfers authorized by this subchapter, there remain funds in the budget of a construction project that had been designated specifically for landscaping, planting and/or reforestation activities, the Department shall use the remaining unobligated funds to perform or pay for other landscaping, planting and/or reforestation activities in the State.