求翻译：1.3.3、地质情况：根据设计说明，土基表层为亚砂土（耕植土）黄色，流塑状，层厚1.6~4.2m；第二层为亚粘土，浅灰色，软塑状，局部流塑状层厚1.0~1.8m；第三层亚砂土，黄色或暗黄色，流塑状，层厚2.0~3.2m；第四层为亚粘土，土质较好。地下水位距地表1.2~1.8m。是什么意思？

1.3.3, and geological situation: under design description, soil base surface for Asia sand (tilling planting soil) yellow, flow plastic shaped, layer thick 1.6~4.2m; second layer for Asia clay, shallow grey, soft plastic shaped, local flow plastic shaped layer thick 1.0~1.8M; third layer Asia sand, yellow or dark yellow, flow plastic shaped, layer thick 2.0~3.2m; fourth layer for Asia clay, soil better. Underground water level from the ground 1.2~1.8M.