(Chatham Tank) E. of Chatham, Ball Township, Sangamon County, IL. Palm Rd. S. 0.3 miles from jct with I55 exit 88 E. of Chatham, W. on Lakewood Dr. 250’ to the tank on the S. side of the road. (N39 41.065 W89 38.928) Photo 11-14-09.