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(a) In connection with the structures require- ment, a density threshold of one structure per five acresoffastland is used for categorizing a coastal barrier as developed. If the density of structures is greater than one unit per five acres, the fastland is developed. If the density is less than one unit per five acres, the fastland is undeveloped. A comparison of the present coastal barrier map with an .aerial photograph prepared in January 1981, by the Florida Department of Transportaticn for the Florida Department of Revenue, indicates that approximately 284.85 acres of fastland in the northern portion of John's Island have been categorized as undeveloped on the coastal barrier map. The aerial photograph, which has had plat map overlays -added and is marked to show precisely the area which we seek to classify, as developed, will be submitted to you at the February 24, 1982, meeting in Fort Pierce, Florida, on the undeveloped coastal barrier map. . The photograph indicates that there are 107 structures, as defined in the Draft Informa- tion Summary, on that portion. of John's Island classified as undeveloped. Since the aerial photograph was taken in January 1981, 1.0 new structures have been added to that portion of John's Island for a total of 117 structures. Using these figures for calculation, there aie 2.21 units per 5 acres of fastland. There- fore, under the Draft Inforn;ation Surmary requirements, that portion of John's Island should be categorized as developed. (b) Moreover, the Draft Information Summary states that all or part of a coastal barrier will be considered.developed, even when there is.less than one structure per five acres, if a full complement of infrastructure is in place. The portion of John's island categorized as un- developed does, in fact, have a full complement of infrastructure. Roads, docks, water supply, sewage system,'and electrical services are, and have been, in place and available to the residents. (c) Even absent the required nuamber of structures and absent an infrastructure, a coastal barrier may still be developed as long as it is a part of a "phased development" and has been part of the overall plans for the development since its inception. The northern portion*of John's Island meets this criterion also. (2) A second requirement for categorizing a coastal barrier as undeveloped is that the structures present and man's activities thereon must'not significantly impede geomorphic and ecological processes. The very nature and extent of the John's Island development has changed the geo- morphic and ecological processes although develop- ment, at all times, has been designed and implemented in harmony with the environment. MAR 10 1982 13 EVOK PAGE 114 J