COM 0844.000 2008-2010 - Laserfiche WebLink

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County Council Transmittal of Kilohana Sewer Improvement District — Implementation Study, Kilohana Sewer Improvements Financing Analysis Report, and Finance Department Memorandum Page 3 of 6 Findings The findings of the Implementation Study are summarized below (following the requirements in Hawai'i County Code Section 12- 10(a)) to describe the manner and cost to sewer the study area. • Preliminary data concerning the special improvements proposed to be constructed: The amount of wastewater flows was based on the per capita wastewater established in the City and County of Honolulu Design Standards of the Department of Wastewater Management (herein referred to as the "design standards ") since the County of Hawai`1 currently references these standards for design works. The flow rate from homes is the product of the number of homes, average daily per capita flow of 80 gallons per day and the population density of 4 persons per single family home. The flow rate from schools is the product of the number of persons and the average daily per capita flow of 25 gallons per day. Table 1 summarizes the estimated future Design Average Flow and Design Peak Flows for the various locations in the study area. • The general character and extent of any improvement to be proposed: The Implementation Study examined three alternatives to replace the large capacity cesspools and other existing (single - family) cesspools located in the study area: o Alternative 1 — Connection to the County sewer system through provision of a central wastewater collection system that will connect to the existing County sewer along Ali'i Drive; o Alternative 2 — Installation of an individual wastewater system (i.e. septic tank with Leach field) on each lot; and o Alternative 3 — Installation of a septic tank or other treatment system upstream of the cesspool and conversion of the large capacity cesspool into a seepage pit. The Implementation Study noted that in consideration to the sizes of existing home lots, and since homes have already been built on almost all lots within the study area, alternatives 2 and 3 are not practical. The Implementation Study noted that open land area on each of the lots may not be adequate for installation of new /additional equipment and that each property owner with individual wastewater systems will be required to provide long -term maintenance of these systems and will be subject to regulatory monitoring, testing and reporting to the State of Hawaii Department of Health (DOH). The central wastewater collection system is a network of pipes that conveys wastewater from its point of origin to a central treatment and disposal location. The Implementation Study describes a system that collects flows from all homes and conveys it downhill to the intersection of Ali'i Drive and Royal Poinciana Drive where it will connect to the existing County sewer system. The existing County sewer system conveys flows from this area to the County's Kealakehe Wastewater Treatment Plant for final treatment and disposal. Due to the prevailing terrain, the centralized wastewater collection system is anticipated to include one or all of the following system components: County of Hawaii is an Equal Opportunity Provider and Employer.