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

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KAPULENA AGRICULTURAL PARK FINAL ENVIRONMENTAL ASSESSMENT elevation where the soil temperature is warmer. Runoff is medium, and the erosion hazard is moderate. This soil was used mostly for sugarcane. Small areas are used for pasture and macadamia nuts. These soils are in Capability Class VI. Kukaiau Silty Clay Loam, KuD (12 -20% slopes) constitutes approximately 752 acres, or roughly 43 percent of the Kapulena Lands. At the site, it is found between the 1000 foot and 1600 foot ground elevations. The Kukaiau series consists of well- drained silty clay loams that formed in volcanic ash. These soils are gently sloping to steep. They are on uplands at an elevation ranging from 500 to 1,500 feet and receive from 70 to 100 inches of rainfall annually. Their mean annual soil temperature is between 67° and 69° F. The natural vegetation consists of hilograss, kaimi clover, guava, and `6hi`a. These soils and Honokaa, Ookala, and Paauhau soils are in the same general area. Historically, Kukaiau soils were used mostly for sugarcane. Small areas are used for truck crops, macadamia nuts, and pasture. This soil is low on the windward side of Mauna Kea. It is dissected by many, deep, narrow gulches. In a representative profile the surface layer is very dark grayish -brown silty clay loam about 10 inches thick. The subsoil is dark -brown silty clay loam about 40 inches thick. It is underlain by basalt. The surface layer is extremely acid, and the subsoil is medium to slightly acid. This soil dehydrates irreversibly into aggregates the size of fine sand. Runoff is medium and the erosion hazard is moderate. This soil was used mainly for sugarcane. Small areas are used for macadamia nuts and pasture. (Capability subclass IVe, nonirrigated; sugarcane group 3; pasture group 7; woodland group 5) Kukaiau Silty Clay Loam, KuE (20-35% slopes) constitutes approximately 127 or roughly 7 percent of the Kapulena Lands. This soil is similar to Kukaiau silty clay loam, 6 to 12 percent slopes, except for the steeper slopes. Runoff is rapid, and the erosion hazard is severe. Included in mapping are small areas in drainageways that have very steep slopes. This soil was historically used mostly for sugarcane. Small areas are used for pasture. (Capability subclass VIe, nonirrigated; sugarcane group 3; pasture group 7; woodland group 5) Paauhau Silty Clay Loam, PaD (12 -20% slopes) constitutes approximately 2 acres, less than one percent of the Kapulena Lands. The Paauhau series consists of well- drained silty clay loams that formed in volcanic ash. These soils are gently sloping to steep. They are in coastal areas on Mauna Kea at an elevation ranging from near sea level to 1,000 feet and receive from 60 to 80 inches of rainfall annually. Their mean annual soil temperature is between 72° and 74° F. The natural vegetation consists of bermudagrass, hilograss, kaimi clover, and carpetgrass. These soils and Kukaiau and Ookala soils are in the same general area. Paauhau soils are used mostly for sugarcane. Small acreages are used for truck crops and pasture. This soil is low on the windward side of Mauna Kea. The dominant slope is 15 percent. In a representative profile the surface layer is very dark grayish -brown silty clay loam about 10 inches thick. The subsoil is dark -brown silty clay loam about 34 inches thick. The substratum is weathering, basic igneous rock. This soil dehydrates irreversibly into fine sand -size aggregates. It is strongly acid in the surface layer and medium acid to slightly acid in the subsoil. Permeability is moderately rapid, runoff is medium, and the erosion hazard is moderate. Roots can penetrate to a depth of 3 feet or more. The available water capacity is 1.8 inches per foot of soil. This soil was historically used mostly for 3 -7