The Pennsylvania Supreme Court has held that a landfill operator's increase in its daily volume of intake was a valid nonconforming use for which no zoning variance was necessary.
Township of Chartiers v. William H. Martin, Inc., ___ Pa. 542 A.2d 985 (1988).
Property Law - Zoning Ordinance - Nonconforming Use,
Duq. L. Rev.
Available at: https://dsc.duq.edu/dlr/vol27/iss2/9