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7 <br />1 <br />' area, the hard limestone layer was encountered between the depths of 1 and <br />4 feet bls, and the layer is from 1 to 2.5 feet thick. <br />' The urban classification to a soil refers to the fact that the area is <br />developed with houses, streets, parking lots, and driveways. <br />According to the soil survey, the Boca -Urban Land Complex at the location <br />' of the study site has severe limitations to its use with septic tank <br />absorption fields. The reason for this severe limitation is the shallow <br />' depth to the rock layer and the high water table. <br />' 4.1.3 OTHER STUDY AREA CHARACTERISTICS <br />Other physical, biological, and human environmental characteristics of the <br />' study area are similar to those described for the rest of Indian River <br />County in the Indian River County Comprehensive Plan, and that report is <br />' hereby referenced. <br />' 4.2 DEMOGRAPHIC AND LAND USE DATA <br />' 4.2.1 COUNTY DEMOGRAPHIC DATA <br />Indian River County's population in 1970 was 36,000. In 1980, the <br />population had increased to 59,896. This is a 66 percent increase in the <br />County's population within that ten-year period. <br />' It should be noted that population growth increased 29 percent between 1975 <br />' and 1980. If a straight line projection was based on these growth rates, <br />the County's future population growth rate would be approximately 6 percent <br />' per year. <br />The primary factor responsible for the rapid growth rates in Indian River <br />' County in the last ten years is the migration of people to the County from <br />r] <br />' IRC.VB4 <br />6/4/87 <br />4-4 <br />