Willett, Hofmann & Associates, Inc. Civil Site Engineering staff are experienced in and capable of providing both private and public residential, commercial, industrial, and governmental developments, providing services ranging from design, permitting and construction staking and observation of sites ranging from a single lot, to multiple-lots. Our staff is experienced in the design of storm water management and detention facilities, site grading, parking lots, roadways, entrances, storm and sanitary sewers, and water distribution for fire protection and domestic use. WHA staff works closely with our in-house Land Surveying Department staff and state and local agencies having jurisdiction over developments throughout the design process to ensure their design and platting standards are met, and provides layout and engineering services during the construction phase of the project.