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

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KAPULENA AGRICULTURAL PARK FINAL ENVIRONMENTAL ASSESSMENT 3.2 TOPOGRAPHY AND GEOLOGY Hawaii Island consists of a group of shield volcanoes that make up a small part of an extensive chain of volcanoes reaching across the mid - Pacific. The Kapulena Lands are located on the northeast side of the island on the northwest flank of Mauna Kea. The land between the several gulches that traverse the site slope at an average of 6 to 12% in the lower elevations of the site, and 10 to 20% at the upper elevations. Soils within the project area derive from Mauna Kea Holocene and Pleistocene era volcanic rocks (Wolfe and Morris 1996). Potential Impacts and Mitigation Measures The grades are suitable for the planned cultivation uses in the lower elevations and the pasture uses in the upper elevations of the site. 3.3 DRAINAGE & SURFACE WATER RESOURCES The Kapulena Lands are bound to the east by Honokaia Gulch. Proceeding west, the lands are traversed by Malanahae Gulch, Kawaikalia Gulch, Kapulena Gulch, Waikoloa Stream, Waialeale Gulch and Waipunahoe Gulch —all perennial streams (see Figure 6, Streams and Drainageways). All of these streams were assessed as having medium cultural values and unknown aquatic and riparian values according to the State's stream assessment study. Of these streams, Waikoloa Stream was deemed the most significant. The National Wetlands Inventory identifies two areas of wetland associated with Malanahae Gulch. These wetlands may be remnant reservoirs, constructed for agricultural irrigation purposes. The Kapulena Lands are designated Zone X by the Flood Insurance Rate Map, indicating that the lands lie outside the 500 -year floodplain (see Figure 7, Flood Insurance Rate Map). Stream crossings by the existing cane roads are over culverts. These culverts are eroded in places and may require improvements. Potential Impacts and Mitigation Measures Although there are no plans to divert water from the streams for irrigation, any future diversion considerations should be required to have an aquatic survey to assess the habitat values and impacts. 3 -3