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The age of the septic system is important due to the fact that newer septic systems would have a <br />two compartment tank and a filter to help produce a better treated effluent. <br />WATER TABLE INDEX (D) <br />Depth to water table <br />Index <br />Above ground surface <br />5 <br />0" to 23" <br />4 <br />24" to 35" <br />3 <br />36" to 48" <br />2 <br />> 48" <br />1 <br />The further the depth to the groundwater under a septic system, the lower the index is. More <br />filtration of chemicals, nutrients, and pathogens occur in dry soils under the septic system <br />drainfield. <br />POTABLE WATER SUPPLY INDEX (E) <br />Potable water status <br />Index <br />Private wells used <br />5 <br />Mixture of private wells and public water <br />3 <br />Public water provided <br />0 <br />Private potable water wells close to a septic system have a higher index. The farther away the well <br />is from a septic system, the less chance there is of contaminating the water supply. Normally, large <br />municipal wells are constructed away from septic systems and are drilled deeper than a private <br />well. ' <br />DENSITY INDEX (F) <br />Density (useable area) <br />Index <br />1 unit or less per acre <br />5 <br />2 units per acre <br />4 <br />3 units per acre <br />3 <br />4 units per acre <br />2 <br />5 units per acre <br />1 <br />6 or more units per acre <br />0.5 <br />By using the methodology described above, the top thirty (30) ranking subdivisions have been <br />identified with the highest overall rating within the geographical area in Indian River County to <br />benefit from a centralized sewer system. <br />F:\Utilities\UTILITY - Engineering\Projects - Utility Construction Permits\IRC - Sewer Feasibility Studies UCP N 4101\Agenda item s\Agenda-Septic to <br />Sewer.doc 81 <br />