Kapulena Hamakua EA PBR Final TMK No. 4-7-005 and 006

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KAPULENA AGRICULTURAL PARK FINAL ENVIRONMENTAL ASSESSMENT 3.5 GROUNDWATER RESOURCES AND HYDROLOGY Kapulena sits atop the Honoka`a system, which is a component of the East Mauna Kea Aquifer. The Honoka`a system has a sustainable yield of approximately 31 million gallons per day (Hawai`i DLNR). The Kukuihaele County water system main is located makai of the site along Highway 240 but would require a connecting line over private property and pumping up to the site. There is a line from the Waimea Water system serving the Boy Scout Camp mauka of the site that could serve the site by gravity flow, but would require crossing over private property (see Figure 11, Aquifers and County Water Systems). Potential Impacts and Mitigation Measures No farm dwellings are contemplated or will be permitted. The likely irrigation sources include pumping from the Lower Hamakua Ditch or water catchments. Deep well drilling to tap groundwater may not be cost - effective, and would be subject to Water Commission well permits when proposed. The proposed educational facilities will likely rely on water catchments. Any proposals requiring offsite improvements for the Lower Hamakua Ditch or connection to the County water system would be assessed separately from this EA. If subdivision is required for leasing or other purposes, the pre- existing lots described in section 1.3 enable a consolidation and resubdivision into 32 lots without having to meet County road and water standards. 3 -13