GSC deep marker sunk into the ground until refusal in a sewer, stamped 79L013 on the lid. It is located on the grounds of the post office at 338 Chemin du Fleuve, in the backyard, 4.60 m from a beacon on a rod, 3.68 m from the east corner extension of the post office, 6.0 m from the south end of a Frost fence, 12.85 m from the south corner of the post office and 28.30 m from the edge of the pavement.