The third outfall served a much smaller percentage of the contributing total population load and was extended only 300 feet into the lagoon, All subaqueous outfall sewers were constructed of 8 inch corru- gated galvanized iron, asbestos impregnated, double dipped asphalt coated pipe. Individual sections were joined with a band type joint which permitted the outfall sewer pipe to be floated into position before submergence, Excessive costs of submarine construction operations were thus avoided and the installations were made with a mini-~ mum expenditure of funds. PARRY ISLAND Cne single unified sanitary system was designed to serve the in-~ stallations on Parry Island. The site plan had been developed plac~ ing outfalls in a location contiguous to the excellent beach facing the lagoon. Protection of this beach from contamination was the prime factor in the design of the system. The flow of sewage had to be directed southwesterly fran the site in order that this could be accomplished, Hence the main sewer was slightly longer than would otherwise have been required, Since the available slope was limited, this necessitated camparatively deep trenching for the lower portion of the main collecting sewer. Available slope also would not permit service to a group of ten barracks buildings located adjacent to the reef side of the island. The ground surface of the area in which these barracks were located was raised a maximum of two feet by grading operations, thereby permitting gravity flow service from this area and resulting in generally improved appearance of this and contiguous areas. The basic design for the sewer system was little affected by the subsequent additions and changes in scope of the work at this site. Primarily, resulting changes in the design of the sewer system involved only the relocation of originally designed service lines or the extension of lateral sewers to serve added areas. The subaqueous outfall sewer carrying the flow of this system was designed to be 1000 feet long, in accordance with requirements of the population load contributing to this flow and the resulting area of the sleek field within the lagoon. RUNIT The construction camp on Runit was located near the southerly end of the island. The extent of the land area available for the develop- ment of the campsite was extremely limited and the facilities required irregular arrangement. However, design of the sewer system provided for economical lengths of collecting lines. Location of the site at the southerly end of the island was somewhat advantageous for location of subaqueous outfall sewer, although adequate protection of the beach required an outfall sewer extending 500 feet from shore. 5-200