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C . The soils consist of well-drained, thin organic soils overlying pahoehoe lava bedrock. In a representative profile, the surface layer is very dark brown muck about 8 inches thick. The soils above the lava is rapidly permeable. The pahoehoe lava is very slowly permeable, but water moves rapidly through the cracks. Runoff is medium and the erosion hazard is slight. A portion of the land on the Hamakua side is classified as Hilo Series (HoC) silty clay loam, 0 to 10 percent slopes. In representative profile, the surface layer is dark-brown silty clay loam about 12 inches thick. The subsoil is about 48 inches thick and consists of dark-brown, dark reddish-brown and very dark grayish- brown silty clay loam. Permeability is rapid, runoff is slow and the erosion hazard is slight. The Wailuku River/Gulch area is classified as Rough Broken (RB) land which is a miscellaneous land type that consists of very steep, precipitous land broken by many intermittent drainage channels. It occurs primarily in gulches and the slope is dominantly 35 to 70 percent. 23. FIRM Map: The Flood Insurance Rate Map classifies a major portion of the affected properties, including the lands on the Hamakua side of Wailuku River, as Zone X, areas determined to be outside 500-year flood plain. Portions of the individual lots on the north side of Kahema Street, the State-owned lands, a portion of Parcel 2 and a portion of the lands on the Hamakua side of Wailuku River are classified as Zone A, Special Flood Hazard Areas inundated by 100-year flood with no base flood elevation determined. 24. Surrounding Land Use/Zoning: Adjacent lands are primarily in single family residences and similar zoned RS-7.5. Lands are also classified Urban by the State Land Use Commission and within the Medium Density Urban Development area as designated by the General Plan LUPAG Map. The County's Water Reservoir site and the existing Piihonua Park and Carvalho Gym complex are located to the west of the Piihonua House Lot Subdivision and approximately 800-900 feet from the intersection of Komohana Street and Waianuenue Avenue. This area is zoned Open. The Hilo High School and Hilo Intermediate School complexes are situated approximately 900 feet to the east from the Komohana Street and Waianuemue Avenue intersection and the -8-