A pilonidal cyst is a unique kind of abscess that occurs in or above the crease of the buttocks. Pilonidal cysts often begin as tiny areas of infection in the base of the area of skin from which hair grows (the hair follicle).
Cofferdam A cofferdam is a temporary enclosure built within, or in pairs across, a body of water and constructed to allow the enclosed area to be pumped out, creating a dry work environment for the major work to proceed.
greater than 6 feet the contractor is required to submit. working drawings for cofferdams prepared by a professional. engineer, licensed in the State of Michigan competent in. geotechnical and structural engineering. The working. drawings and calculations must be sealed by the licensed. engineer.