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Table 3-5 of the HRS Rule

Depth to aquifera (feet) Assigned value
Less than or equal to 25 5
Greater than 25 to 250 3
Greater than 250 1

a Use depth of all layers between the hazardous substances andaquifer.Assign a thickness of 0 feet to any karst aquifer thatunderlies anyportion of the sources at the site.


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