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O103.1.1 Screening for Potential Liquefaction Hazards
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Liquefaction potential may be considered low when any of the following conditions are identified:
- Groundwater conditions have been evaluated to a depth of 50 feet below the ground surface and no saturated soils have been identified within this zone. Groundwater conditions may be evaluated by traditional geotechnical exploration methods or published well data may be referenced. Evaluation of groundwater conditions should take into account seasonal variation in groundwater elevation.
- Geotechnical exploration logs indicate that there are no soil strata present in the upper 50 feet that consist of low density silts and/or sands which have standardized blow counts (ASTM D1586) less than 15 blows per foot.
- Geotechnical exploration logs indicate that there are soil strata present in the upper 50 feet that consist of low density silts and/or sands which possess cohesive soil properties that reduce the likelihood of liquefaction. Soils having a plasticity index (PI) greater than 12 are generally expected to behave like clays; however, if the PI is greater than 7 and the in-situ moisture content of the soils is less than 85% of the liquid limit, clay-like behavior may also expected. Engineering judgment must be applied when using this criteria.
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