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' 6.0 ALTERNATIVE WASTEWATER COLLECTION SYSTEMS <br />' <br />6.1 GENERAL <br />As presented in Section 4, the high groundwater situation and the <br />' <br />population density of the area preclude the use of onsite systems as the <br />most cost-effective and environmentally sound waste management technique. <br />' <br />Both the Indian River County Area- Wide Master Plan and the Comprehensive <br />Plan are based on the assumption that the wastewater flows in densely <br />' <br />populated areas should be collected and treated by one of the regional <br />wastewater treatment plants. The block -by -block analysis presented previ- <br />ously showed that a collection system is warranted. Such a system would be <br />eligible for grant funds under EPA criteria. Traditionally, conventional <br />gravity sewer systems have been used in Florida for conveying wastewater. <br />' <br />The possible collection system alternatives to conventional gravity sewers <br />are small diameter sewers, vacuum sewers, and pressure sewers. <br />6.2 ALTERNATIVE SYSTEMS <br />' <br />6.2.1 SMALL DIAMETER SEWERS <br />' <br />The alternative of small diameter sewers was eliminated based on the <br />Recommended Standards for Sewage Works, 1978, by the Great Lakes - Upper <br />' <br />Mississippi River Board of State Sanitary Engineers, which requires a <br />minimum diameter of 8 inches for sewer lines. In addition, smaller -sized <br />' <br />pipe would require steeper slopes and, therefore, more expensive, deeper <br />cuts to maintain the minimum cleansing velocity of 2 feet per second. This <br />' <br />is not economically practical considering the topography of the area. <br />' 6.2.2 VACUUM SEWERS <br />The alternative of vacuum sewers was eliminated due to technical <br />' deficiencies presently associated with this type of system. Problems occur <br />in three areas: system design, component reliability, and a lack of <br />IRC.VB4 <br />6/4/87 <br />6-1 <br />