Table 2 Estimates of the seven variables used for computing the DRASTIC index

D

Depth to water table

5-15 feet*

9

5

R

Net recharge

18.2 inches^*

9

4

A

Aquifer media

Limestone

6

3

S

Soil media

Silt Loam

4

2

T

Topography

2%

10

1

I

Impact of vadose zone media

Sand and gravel with significant silt and clay

6

5

C

Hydraulic Conductivity

>2000 gpd/ft^2*

10

3