Because the final design and construction of the facilities on Eniwetok Island was undertaken relatively late in the program of development of the Proving Ground, due to changes in military require- ments, insufficient time was available for the normal procurement of additional distillation equipment needed to cope with contimuing in- crease in population. The military construction batallion brought to Eniwetok approximately 27 portable type, 150 gph distillation units for support of its initial field operations, Eight of these units were later installed as an additional battery to supplement the permanent distillation units during the peak period of test operations. Design for a water barge-to-shore pipe line was prepared which would permit ships moored in the lagoon to supply water to the shore installation as an emergency source of fresh water in the event that it might be required. However, portable type stills and permanent units sufficed for all requirements. Distilled water was chlorinated at a point in the line of flow between the discharge of the distillation units and the fresh water ground storage tanks. For this purpose, a small hypochlorinator was housed in the distillation building. The solution containing chlorine was mixed and stored in a drum and the hypochlorinator automatically injected the solution into the line of flow in proportion to the rate of flow. The proportioning and control of the rate of application of the chlorine solution was accanplished by means of a 3 inch meter installed in the 3 inch distillation discharge line. Fresh water surface tanks were procurred from surplus naval stores at Pearl Harbor, and design of storage facilities was likewise predicated upon sizes and capacities available. Two 1000 barrel (42,000 gallons each) bolted steel tanks were provided at ground level adjacent to the distillation plant. Fresh water pumps for supplying the fresh water distribution system were housed within the distillation building and took their suctions from the fresh water surface storage tanks located adjacent thereto, Fresh water pumps consisted of two 100 gpm, electric motor driven horizontal centrifugal pumps and one standby 100 gpm gasoline engine driven horizontal centrifugal pump. The operation of these pumps was controlled by the liquid level of the elevated fresh water storage tank. The fresh water distribution system consisted primarily of 6 inch, 4 inch, and 3 inch transite pipe mains arranged in a network similar to that of the salt water distribution system and in general paralleled that system. As with salt water distribution system, changes in locations of buildings or addition of additional buildings required only the relocation of service lines or extensions to the main network system. The fresh water elevated storage tank was placed on the platform of the 50 foot tower which supported the salt water elevated tank. This elevated fresh water tank was similar to the bolted steel salt water tank and had a capacity of 500 barrels (21,000 gallons). 5-190