A. 勘探点布置时近污染源处宜密，远污染源处宜疏
B. 确定污染土和非污染土界限时，取土间距不宜大于1m
C. 同一钻孔内采取不同深度的地下水样时，应采取严格的隔离措施
D. 根据污染土的颜色、状态、气味可确定污染对土的工程特性的影响程度
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