If you want to limit it to FNMA then again look at the line in question. Easements, encroachments and environmental conditions are site specific. The only question is the "land uses".
If this thread is not for a FNMA assignment, someone please stop me.
When the appraiser has knowledge of any hazardous condition
(whether it exists in or on the subject property or on any site within
the vicinity of the property)--such as the presence of hazardous
wastes, toxic substances, asbestos-containing materials,
ureaformaldehyde insulation, radon gas, etc.--he or she must note
the hazardous condition on the appraisal report and comment on any
influence that the hazard has on the property's value and
marketability (if it is measurable through an analysis of comparable
market data as of the effective date of the appraisal) and make
appropriate adjustments in the overall analysis of the property's
value.