St. Mathew Island Area, Alaska
The dominant drainage class is Well 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. Mathew Island Area, Alaska.
| Soil Map Unit | Acres | Drainage | Hydro Group | Dwellings | Septic |
|---|---|---|---|---|---|
| Northern Bering Sea Islands-NorthMaritime Upland-Rounded Mountains | 49K | Well drained | D | Very limited | Very limited |
| Northern Bering Sea Islands-Maritime Upland-Plains | 20K | Very poorly drained | D | Very limited | Very limited |
| Northern Bering Sea Islands-Maritime Lowland-Coastal Plains | 12K | Very poorly drained | B/D | Very limited | Very limited |
| Northern Bering Sea Islands-Maritime Water, Saline | 2K | 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, flood-prone areas. A geotechnical assessment is recommended before building.
Septic Systems
About 97% of soils are rated "very limited" for septic absorption fields. Despite good drainage overall, limitations may stem from shallow bedrock, steep slopes, or seasonal conditions. Engineered or alternative systems are frequently required. Always get a professional perc test before purchasing land that needs septic.
Gardening & Agriculture
Drainage is generally favorable for gardening. Adding compost and mulch will improve fertility and water retention. Test your soil's pH before planting — most vegetables prefer 6.0-7.0.