An offset well test program was developed, which involved drilling of two (2) offset wells sequentially in the direction of the expected maximum and minimum permeabilities from a centrally located producing (15 years'production) control well followed by interference testing. The field activities of the program were successfully completed during August 1981. This report details the field activities during the drilling and testing phase of the program. Columbia Gas Well No. 10056 in Meigs County, OH, was chosen as the test site for the program.