docs: def sludge(self, column=None, value=None, **kwargs):
          """
          Sludge information describes the volumn of sludge produced at a
          facility, identification information on a sludge handler, and
          classification/permitting information on a facility that handles
          sludge, such as a pretreatment POTW.
  
          >>> PCS().sludge('county_name', 'San Francisco')
          """
          return self._resolve_call('PCS_SLUDGE', column, value, **kwargs)