The septic sludge at liftlock No. 47 E, one of the few intact Union Canal locks along the Tulpehocken Trail. From the Berks County website: "When the [Union] canal was in operation (1827-1884) the locktender's home would have been located on the land between the hill and the lock. Some of the men who lived in this locktender's home were Edwin Ball, Jacob Grubb, William Adies, Samuel Werner, and John Moyer. Their job assignments included operation and maintenance of this lock. Locktenders' salaries ranged from a maximum of $10.00 a month to a low of $1.00 a month, which they received in the later days of operation of the Union Canal."