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1 ' Chapter 1OD-6 of the "Rules of the State of Florida, Department of Health and Rehabilitative Services" states, "The water table elevation at the wettest season of the year is at least 24 inches below the bottom surface ' of the drainfield gravel." By following the construction standards for drainfield systems in IOD -6.56 of a minimum cover of 6 inches and 14 inches ' of gravel in the drainfield, the minimum of 24 inches from the bottom of the drainfield gravel bed to the top of the water table cannot be met by ' many of the existing systems in the study area. ' 4.1.2 SOILS The United States Department of Agriculture (USDA), through the Soils Conservation Service (SCS), provides detailed maps and data on the soils of a particular area through Soil Surveys. The composition of the soils, the shallow depth to the limestone (1 to 4 ' feet) along with the existence of a high water table, pose severe constraints on the effective and efficient operation of conventional septic ' tank disposal systems. The fine grained soils are not well suited for septic tank disposal systems because of their low permeability. ' According to the soil survey on Map Number 27, the predominant soil type in the study area is the Boca -Urban Land Complex. This soil type accounts for ' between 50 and 70 percent of the land area. Twenty to thirty percent of the soil is of the urban land classification, and the remaining small ' percentage is of the Chobee, EauGallie, Floridana and Jupiter types, which will not be discussed further because they are not a major percentage and ' they are somewhat insignificant. ' The Boca soil type is characteristically made up of fine sands and silt to a depth of roughly 4 feet, underlain by a hard limestone layer. According to Masteller & Moler Associates, who performed soil borings at the study 1 IRC.VB4 6/4/87 4-3