St. Lawrence Island Area, Alaska
The dominant drainage class is Very poorly drained and the dominant hydrologic group is D (very slow infiltration, high runoff). This report summarizes the major soil map units across the survey area to help you understand what to expect when buying, building, or gardening in St. Lawrence Island Area, Alaska.
| Soil Map Unit | Acres | Drainage | Hydro Group | Dwellings | Septic |
|---|---|---|---|---|---|
| Northern Bering Sea Islands-Maritime Upland-Plains | 730K | Very poorly drained | D | Very limited | Very limited |
| Northern Bering Sea Islands-NorthMaritime Upland-Rounded Mountains | 424K | Well drained | D | Very limited | Very limited |
| Northern Bering Sea Islands-Maritime Water, Saline | 28K | Not limited | Not limited |
What This Means
Building & Foundations
About 97% of soils are rated "very limited" for dwellings with basements. Specific challenges include steep slopes, poor drainage in some areas. A geotechnical assessment is recommended before building.
Septic Systems
About 97% of soils are rated "very limited" for septic absorption fields. Poorly drained soils can't absorb septic effluent effectively. Engineered or alternative systems are frequently required. Always get a professional perc test before purchasing land that needs septic.
Gardening & Agriculture
Many soils hold water for extended periods. Raised beds are highly recommended to improve drainage for vegetables. Well-adapted native plants and water-loving species will do best in natural conditions.