(a) One permanent survey benchmark of known elevation measured from a United States geological survey (USGS) benchmark must be established and maintained for each 25 acres of developed landfill, or part thereof, at the site. This benchmark must be the reference point for establishing vertical elevation control.

(b) The New York transverse mercator (NYTM) coordinates for the landfill must be established. Horizontal control must be established and one of its points must be a benchmark established under subdivision (a) of this section.