but eventually there will be a need for concurrent quantitative detection 

 and measurement of at least two, and possibly four, isotopes. 



d. Choice of the appropriate gamma pulse-height analyzer system. The 

 program requires a system with the capability to discriminate between two 

 to four gamma energy peaks. When using multiple isotopes or discriminating 

 multiple energy peaks, the measurements must be essentially simultaneous 

 and yet be statistically significant. 



e. Design and construction of a vehicle on which the detector (s) can 

 be mounted. The vehicle must be suitable for use in highly turbulent water 

 and in areas that are rocky or otherwise present a very rough surface. 



f . Development of a safety program with provision for a safety 

 officer, and the determination of suitable safe methods of handling and 

 emplacing the isotope. 



g. Design of the field experiments. 



A number of agencies have an interest in one or several of the program 

 objectives. Besides CERC, two other offices of the Corps of Engineers, 

 the U. S. Army Engineer Division, South Pacific (SPD), and the U. S. Army 

 Engineer District, Los Angeles (SPL), are participating in this program. 

 The requirements of both of the above offices concern shore-protection 

 structures along the coast. Basic information concerning the direction, 

 path, and quantity of material moving in the littoral zone is needed for 

 inproved functional design. For example, a harbor of refuge will be needed 

 somewhere along the coast between Point Conception and Santa Barbara, 

 California, probably near Gaviota. To properly design such a protected 

 harbor, it is necessary to know the littoral sediment transport pattern 

 in the area. The transport pattern would have an important effect upon 

 the determination of the annual costs of maintaining adequate navigation 

 depths in the channel which, in turn, would be dependent upon the loca- 

 tion at which the sediments approach close to shore. If the drift were 

 close to shore west from Gaviota, the material could shoal the channel. 



Another Federal agency, Headquarters, First Strategic Aerospace Divi- 

 sion (SAC) at Vandenberg Air Force Base, is participating in this program. 

 Their objectives are quite different from those of the Corps of Engineers. 

 The Air Force objectives are influenced by the geographical location and 

 the mission of Vandenberg Air Force Base. The southeasterly limit of Air 

 Force interest is controlled by the firing envelope (range safety limit) 

 which reaches approximately to Santa Barbara; therefore, Vandenberg Air 

 Force Base has requirements along the entire reach of shore between Point 

 Sal. and Santa Barbara. The Air Force is concerned about possible missile 

 aborts (failures) which could cause contamination of water and sediments 

 by exotic fuels. Since several of these exotic fuels are harmful to 

 public safety, it is very important to determine whether contaminated 

 sediments would reach areas available and freely accessible to the public. 

 The Air Force is also interested in the location and construction of a 

 harbor for military craft. 



