III. SAMPLING TOWER AND MODULAR SUPPORT BUILDING DESCRIPTION For our atmospheric studies on Enewetak we must be removed as far as possible from local contamination. Thus we would like to undertake our experiments, and locate our sampling tower and support building, on the northeast side of Sand Island. We anticipate the sampling tower will be shipped in four pieces with a total volume of 600 ft~ and a total weight of 3600 Ibs. The tower is 60 feet high when erected, and is constructed of an aluminum alloy. It is composed of ten 6 foot collapsible sections, each fitting on top of the one below. The cross sectional area of the tower is 4' x 6', with additional 6' x 6' outboard platforms at the 10th level and 4' x 6' additional outboard platforms at the 7th level. Several diagrams of the tower are attached. The base of the tower is 4 small concrete pads, about 18" x 18", which we will pour ourselves. We will also be completely responsible for the tower construction and installation of guy wires. The modular scientific support building, is to be located at the tower's base. It is a heavy duty aluminum, skid mounted, portable building with a fiberglass roof covering. The building will be shipped entirely, erected weighting approximately 2800 lbs. and having a volume of 1000 ft3. The building requires no foundation on Sand Island and will be secured with guy wires.