5.

You are concerned because an industrial facility will be installing a well in the same

confined aquifer in which you have a domestic well. The proposed well site is 300 feet

due south of your well and will be pumped continuously at 180,000 gallons per day.

You attend a township planning board meeting in which the township's engineer is

discussing the proposed well with the industrial facility's engineer. Since you are a

member of the township, the township engineer is there to protect your interests.

The township engineer indicates: "Drawdown in the monitoring well 150 feet

due east of the proposed production well will be 5.5 feet after only 1 year of

pumping."

The facility engineer counters: "This would be correct if no constant head

boundary existed in the area of the production well. However, Sauder Creek,

which runs north to south 450 feet due east of the production well, will

eventually provide all of the water which the production well discharges. After 1

year, drawdown in that monitoring well will be only 1.5 feet. We confirmed this

using pump test data. Furthermore, drawdown in the monitoring well will never

be more than 1.5 feet."

After performing some calculations the township engineer says: "Okay, I agree

with you."

Realizing your concern for your domestic well, the facility engineer then turns to

you and says: "Don't worry. I promise that the added drawdown in the vicinity of

your well due to our production well will never be more than approximately 1

foot."

A. Determine the storage coefficient, S, and the transmissivity, T, of the aquifer. Assume

Theis analysis applies. You may wish to start by assuming u < .05 so that you can

approximate W(u) = -.5772-In(u). Once you determine T and S, check to be sure u

< .05.

B. Show that the facility engineer's promise will not be broken.