The seepage pit site is located in the northern edge of the large open field area south of Tolentine Hall and St. Thomas Monastery.  The figure below shows an aerial photo of the area with the seepage pits indicated by red dots. The Tolentine pit is to the left and the Monastery pit is to the right.

The Tolentine pit is currently disconnected from all stormwater sources. We are currently investigating a use for this pit. The Monastery pit accepts runoff from the following impervious surfaces:

• All of the St. Thomas Monastery roof: 1720 m²

• Part of the Tolentine Hall roof: 900 m²

An average rainstorm event of 12.7 mm (0.5 in) for the Philadelphia, PA area will produce 33,500 L (8,850 gallons) of water and a 50.8 mm (2.0 in) rainstorm event will produce 122,120 L (32,260 gallons) of water. The pits are circular in shape with brick walls and a sand layer bottom

• Both pits are approximately 1.83 m (6 ft) in diameter
• The Monastery pit is 3.96 m (13 ft) in depth
• The Tolentine pit is 1.52 m (5 ft) in depth
• There are overflow pipes that lead out to the field if the capacity of the pit is exceeded.

Our historical research indicates that the pits were always intended for the storage and infiltration of stormwater. The connection of the sewer line in the 80's was completely accidental.