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.