This letter was supplemental to a map sent by Project Design Engineer John E. Eckenrode to Mr. Bob Wod of SEPTA Real Estate Department on November 1, 2002.

The map has been filed in the Fairmount Park Historic Resource Archive's flatfile: Drawer W24, folder W24 General

Both images of the map and the letter have been digitally stored in the Fairmount Park Historic Resource Archive's database under the folder path: J:\Digital Assets\Reference Collection\Locations\Wissahickon Valley Park\Colony Castle_Philadelphia Canoe Club

The map's digital IDs has been saved as: Colony Castle_Canoe Club - Sewer Site Plan and Profile (1).jpg Colony Castle_Canoe Club - Sewer Site Plan and Profile (2).jpg Colony Castle_Canoe Club - Sewer Site Plan and Profile (3).jpg Colony Castle_Canoe Club - Sewer Site Plan and Profile (4).jpg