Layer Estimates:

Layer: Mileposts (ID:0)
Count: 470
Extent:

XMin: -9272913.61502838
YMin: 4204578.24625799
XMax: -8778497.03195162
YMax: 4583913.29170043
Spatial Reference: 102100 (3857)

Layer: Milepost tenths (ID:1)
Count: 4691
Extent:

XMin: -9272909.04925946
YMin: 4204230.67442266
XMax: -8778355.64684748
YMax: 4583916.21280282
Spatial Reference: 102100 (3857)

Layer: Blue Ridge Parkway (ID:2)
Count: 71
Extent:

XMin: -10354507.918138
YMin: 2006281.57578371
XMax: -7186423.01486331
YMax: 4584127.97393467
Spatial Reference: 102100 (3857)