Marine Corps Air Ground Combat Center at Twentynine Palms, California
The dominant drainage class is Excessively drained and the dominant hydrologic group is A (high infiltration, low 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 Marine Corps Air Ground Combat Center at Twentynine Palms, California.
| Soil Map Unit | Acres | Drainage | Hydro Group | Dwellings | Septic |
|---|---|---|---|---|---|
| Goldroad-Dalvord-Rock outcrop association, 15 to 50 percent slopes | 79K | Somewhat excessively drained | D | Very limited | Very limited |
| Carrizo complex, 2 to 8 percent slopes | 61K | Excessively drained | A | Very limited | Very limited |
| Haleburu-Noble Pass complex, 15 to 50 percent slopes | 30K | Well drained | D | Very limited | Very limited |
| Noble Pass-Pacific Mesa-Sunrock complex, 15 to 75 percent slopes | 25K | Well drained | D | Very limited | Very limited |
| Arizo extremely gravelly loamy sand, dry, 2 to 8 percent slopes | 20K | Excessively drained | A | Very limited | Very limited |
| Arizo, dry-Twobitter association, 2 to 8 percent slopes | 18K | Excessively drained | A | Very limited | Very limited |
| Eastrange gravelly sandy loam, 8 to 30 percent slopes | 15K | Somewhat excessively drained | A | Very limited | Very limited |
| Bristolake-Carrizo association, 0 to 4 percent slopes | 15K | Somewhat excessively drained | A | Very limited | Very limited |
| Edalph loamy sand, 2 to 8 percent slopes | 15K | Well drained | A | Very limited | Very limited |
| Arizo sand, 2 to 4 percent slopes | 15K | Excessively drained | A | Very limited | Very limited |
| Carrizo-Clegorpass association, 2 to 8 percent slopes | 14K | Excessively drained | A | Very limited | Very limited |
| Arizo extremely gravelly loamy sand, 2 to 8 percent slopes | 14K | Excessively drained | A | Very limited | Very limited |
| Sunrock-Haleburu-Lava flows association, 15 to 75 percent slopes | 13K | Well drained | D | Very limited | Very limited |
| Arizo-Hypoint-Olympus complex, 2 to 8 percent slopes | 12K | Excessively drained | A | Very limited | Very limited |
| Narea-Desfirex-Edalph complex, 2 to 8 percent slopes | 12K | Somewhat excessively drained | A | Very limited | Very limited |
| Arizo-Hypoint association, 2 to 8 percent slopes | 11K | Excessively drained | A | Very limited | Very limited |
| Cajon coarse sand, 0 to 4 percent slopes | 10K | Somewhat excessively drained | A | Very limited | Very limited |
| Haleburu-Upspring complex, 8 to 50 percent slopes | 9K | Well drained | D | Very limited | Very limited |
| Bluepoint sand, 2 to 8 percent slopes | 9K | Somewhat excessively drained | A | Very limited | Very limited |
| Dalvord association, 15 to 50 percent slopes | 9K | Somewhat excessively drained | D | Very limited | Very limited |
What This Means
Building & Foundations
About 100% of soils are rated "very limited" for dwellings with basements. Specific challenges include shallow bedrock, steep slopes, flood-prone areas, sandy or gravelly soils with low bearing capacity. A geotechnical assessment is recommended before building.
Septic Systems
About 100% of soils are rated "very limited" for septic absorption fields. The well-drained soils may actually drain too fast for standard leach fields, allowing effluent to reach groundwater. Engineered or alternative systems are frequently required. Always get a professional perc test before purchasing land that needs septic.
Gardening & Agriculture
Soils tend to drain very quickly, meaning nutrients and water don't stick around long. Raised beds with amended soil, drip irrigation, and heavy mulching will give the best results. Compost is your best friend here — it improves water retention dramatically.