AISP Kamehameha Highway Guideway - Honolulu Rail Transit Project

Cultural Surveys Hawai‘i Job Code: MANANA 1
Introduction
temperature is 73° F. Molokai soils are geographically associated with Holomua,
Keahua, Lahaina, and Uwala soils.
In this survey area a shallow variant of the Molokai series was mapped. This soil,
Molokai silty clay loam, shallow variant, 15 to 25 percent slopes, severely eroded,
is described in alphabetical order, along with other mapping units of this series.
These soils are used for sugarcane, pineapple, pasture, wildlife habitat, and home
sites. The natural vegetation consists of kiawe, ‘ilima, uhaloa, feather fingergrass,
and buffalo grass. [Foote et al. 1972:96]
Soils of the Pearl Harbor Series are described as follows:
This series consists of very poorly drained soils on nearly level coastal plains on
the island of Oahu. These soils developed in alluvium overlying organic material.
Elevations range from nearly sea level to 5 feet. The annual rainfall amounts to 18
to 40 inches. The mean annual soil temperature is 74° F. Pearl Harbor soils are
geographically associated with Hanalei, Kaloko, and Keaau soils.
These soils are used for taro, sugarcane, and pasture. The natural vegetation
consists of cattails, mangrove trees, California grass, and sedges. [Foote et al.
1972:112]
Rock Land sediments are described as follows:
Rock land (rRK) is made up of areas where exposed rock covers 25 to 90 percent
of the surface. It occurs on all five islands. The rock outcrops and very shallow
soils are the main characteristics. The rock outcrops are mainly basalt and
andesite. This land type is nearly level to very steep. Elevations range from nearly
sea level to more than 6,000 feet. The annual rainfall amounts to 15 to 60 inches.
Rock land is used for pasture, wildlife habitat, and water supply. The natural
vegetation at the lower elevations consists mainly of kiawe, klu, piligrass,
Japanese tea, and koa haole. Lantana, guava, Natal redtop, and molassesgrass are
dominant at the higher elevations. Thais land type is also used for urban
development. In many areas, especially on the island of Oahu, the soil material
associated with the rock outcrops is very sticky and very plastic. It also has high
shrink-swell potential. Buildings on the steep slopes are susceptible to sliding
when the soil is saturated. Foundations and retaining walls are susceptible to
cracking. [Foote et al. 1972:119]
Soils of the Tropaquepts Series are described as follows:
Tropaquepts (TR) are poorly drained soils that are periodically flooded by
irrigation in order to grow crops that thrive in water. They occur as nearly level
flood plains on the islands of Oahu and Maui. Elevations range from sea level to
200 feet. The annual rainfall amounts to 20 to 150 inches.
These soils have been flooded for varying lengths of time, and soil development
differs in degree from place to place. Generally, the surface layer, about 10 inches
Archaeological Inventory Survey Plan, HHCTCP Construction Phase II, Waiawa, Mānana, Waimano, Waiau,
Waimalu, Kalauao, ‘Aiea, and Hālawa Ahupua‘a, ‘Ewa District, Island of O‘ahu
TMK[1] 9-7, 9-8, and 9-9 - Various Plats and Parcels
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