PD RECOMMENDATION REPORT (PL-SMA-2021-000004)

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on Water Resources of the Kumu Hou Project which was completed in June 2021 by Tom Nance. The study revealed that the current amount of nutrients discharging to nearshore waters would be reduced with the development of the proposed project. It is assumed that by reducing the area of active golf course greens coupled with an increased use of R-I treated wastewater applied as irrigation will result in a reduction in the total nutrient load entering the groundwater flux towards the ocean. Additional long-term impacts include an increase of impervious surface from the transition from golf course to residential uses. An increase in stormwater runoff could cause soil erosion and elevate potential impacts to groundwater from common residential pollution such as oil/gas from vehicles, animal waste, and soap/cleaners that enter the groundwater system. The use of drywells to address on-site drainage, not directing stormwater towards the ocean, and compliance with the Chapter 27,Flood Control, Hawaii County Code, will mitigate the potential impacts of increase stormwater inputs to the nearshore/ocean area. Additional Best Management Practices (BMPs) such as site appropriate landscaping and efficient sprinklers will also aim to mitigate impacts from the increase in stormwater. These will be added as conditions of approval. To address the potential impacts of the proposed development on water quality, marine resources, and coastal ecosystems the applicant will implement BMPs as part of the National Pollutant Discharge Elimination System (NPDES) permit process as well as complying with Chapter 10, Erosion and Sedimentation Control, Hawaii County Code, and State Department of Health (DOH) water pollution control regulations. Additionally, a condition of approval of the concurrent Project District rezoning will require any uses within the project area that create wastewater to connect to the Waikoloa Beach Resort Wastewater Treatment Plant which will bolster the amount of R-1 treated wastewater being applied for irrigation purposes. In addition to the BMPS mentioned above, a condition of approval will require the applicant to update the resort's Water Quality Monitoring Plan and program (as required by the LUC D&O for the entire WBC) to ensure any project related impacts to groundwater and ocean water are appropriately measured, monitored, and mitigated meeting with the requirements of the State Department of Health. -9-