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' The study area of Rockridge is located in east central Indian River County. Aerials are included herein to illustrate conditions within the study area. ' Tables were developed to illustrate population density and wastewater flow computations on a block -by -block basis. IThe EPA may provide partial funding of new collection systems under Public In addition to the above criterion, the system should be cost-effective. ' Generally, where the population density is less than 1.7 persons per acre, wastewater collection system projects are not considered cost-effective ' unless a severe pollution or public health problem can be documented. Where population density is less than 10 persons per acre, the facility ' plan should demonstrate that alternatives are less cost-effective than new gravity collector sewer construction and centralized treatment. ' 1.2 CONCLUSIONS ' The following conclusions are presented based upon the analysis and evaluation performed under this supplemental study to the Indian River ' County Facility (201) Plan: ' o Onsite waste disposal systems are ineffective because of the high groundwater and impermeable limestone layer beneath the ' drainfields. o Substantial human habitation was present in 1972 in all study area ' blocks. ' IRC.VB4 6/4/87 1-2 Law 92-500, if the proposed system meets certain criteria. For a block to ' be grant -eligible, it must have contained "substantial human habitation" on October 18, 1972. Blocks are grouped to form service areas, from which ' compliance with the "two-thirds rule" may be determined. This rule states that the ratio of service area flows on October 18, 1972, to those at full ' development must be greater than two-thirds. In addition to the above criterion, the system should be cost-effective. ' Generally, where the population density is less than 1.7 persons per acre, wastewater collection system projects are not considered cost-effective ' unless a severe pollution or public health problem can be documented. Where population density is less than 10 persons per acre, the facility ' plan should demonstrate that alternatives are less cost-effective than new gravity collector sewer construction and centralized treatment. ' 1.2 CONCLUSIONS ' The following conclusions are presented based upon the analysis and evaluation performed under this supplemental study to the Indian River ' County Facility (201) Plan: ' o Onsite waste disposal systems are ineffective because of the high groundwater and impermeable limestone layer beneath the ' drainfields. o Substantial human habitation was present in 1972 in all study area ' blocks. ' IRC.VB4 6/4/87 1-2