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1 <br />0 <br />' <br />other areas of the state and country. Population increase in the County <br />due to net migration was 96.8 percent during the years 1970 to 1979. <br />The age distribution of Indian River County has changed dramatically. <br />Table 4-1 indicates that while the percentage of the population aged 0-14 <br />' <br />has dropped from 30.4 percent in 1960 to 18.1 percent in 1980, the <br />percentage of those people aged 65 or over has increased from 13.9 percent <br />' <br />to 20.3 percent during the same period. These trends in the age <br />distribution of the County's population reflect the large number of elderly <br />and retirees moving to the County. During the 1960 to 1980 period, <br />relatively little change has occurred in the percentage of population of <br />' <br />working age (this includes ages 15-64). <br />4.2.2 LAND USE DATA <br />In order to obtain specific land use data for the study area, aerial <br />' <br />photographs were examined. Those taken in 1969 are representative of the <br />area prior to October 18, 1972, when PL 92-500 was signed. Also, the Land <br />Use Map for Indian River County, as well as other aerials, were used in <br />preparing this report. <br />' <br />4.2.3 ROCKRIDGE STUDY AREA <br />' The Rockridge Study Area is located in Indian River County east of 6th <br />Avenue and south of 17th Street. The study area lies about 2,000 feet west <br />' of the Indian River and is in close proximity to the Vero Beach Wastewater <br />Treatment Plant. The study area can be seen on Figure 4-1. <br />' The study area is located on top of a layer of hard limestone containing <br />' fractures and solution holes. The limestone layer is about one to two feet <br />below the ground surface and is one to two feet thick. Also, the <br />groundwater level is present between three to four feet below the ground <br />r, <br />' IRC.VB4 <br />6/4/87 <br />4-5 <br />