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Blue Plains Impoundment Lot: southeast corner of the lot on the Maryland side of the fence. This stone, a replacement, is located nearly eight feet below ground level at the bottom of a narrow concrete pipe and surrounded by dirt and forest debris, such that only the very top is visible. The pipe is embedded in a mound of gravel a short distance from the lightposts at the rear of the parking lot. In mid-2006, the pipe was helpfully spraypainted with "MON 8" and marked with two small wooden stakes that read "MD. / D.C. BOUNDARY MON. #8."

The original stone was removed in 1958 during construction and then either lost or stolen from a storage facility before it could be reset in the ground. On March 23, 1962, DAR placed a new inscription-less stone in the same location along with the original stone's iron cage. By 1972, it too was in trouble, as described by Edwin Darby Nye in a paper read that year before the Columbia Histrocial Society: "SE8, at the far end of the D.C. Village Area, has become a victim of a large land-fill operation, involving the D.C. auto impounding area, the new sewage treatment plant, and an eighteen-hole golf course being constructed by the National Park Service. SE8 is covered with some eight feet of landfill. A sixty-inch concrete pipe has been placed over the stone, iron fencing and all, and a cover placed over it to protect it. The stone has been uncovered and after excavation has been completed it will be reset in a proper location." Unfortunately, nothing of the sort occurred, and the stone was completely covered by landfill until 1991 when the bicentennial resurveying team dug it back out of the ground, using old photos to approximate its location. The team then decided that the best way to preserve the stone was to put it back into the earth, this time protected by a taller pipe that was visible above ground. To reach this stone, start on the paved path that leads from D.C. Village Lane toward Oxon Run, and then follow the fence along the Maryland border southwest until you arrive on the access road behind the impoundment lot. Bring a flashlight.

Zoom to street map.