D.C. Mun. Regs. tit. 20, r. 20-7213
The total project cost of a proposed action shall include the cost of supplying utility service to the project, the cost of site preparation, the cost of labor and material, the cost of any process equipment required by the project, and the cost of installation of any process equipment.
The cost of site preparation shall include both pre- and post-construction site work, including clearing of trees and vegetation, grading and excavation, implementation of soil erosion and sedimentation control plans, installation of storm water management facilities, and the post-construction replacement of trees and vegetation and other landscaping.
Site preparation costs shall not include the costs of any remediation actions taken to remove contaminated soils or to treat contaminated soils or ground water on site.
D.C. Mun. Regs. tit. 20, r. 20-7213