MONTGOMERY COUNTY. 3677

will be heard. Such notice may be mailed to the last known address of
the owner, or served in person upon any adult occupying the premises, or
in the case of vacant or unimproved property, posted upon the premises.
The classification of any property as made by the Commission shall be
final, subject only to revision at said hearing. The Commission may
change the classification of properties from time to time as said properties
change in the uses to which they are put. Said benefit shall be levied for
both water supply and sewerage construction and shall be based for each
class of property upon the approximate cost of said construction as an
integral part of the whole system and the number of front feet abutting
upon the street, lane, road, alley or right of way in which the water pipe
or sewer is placed.

All front foot benefit charges heretofore levied by said Commission,
whether by original levy or by increase, as the same stood charged by said
Commission against the respective properties on December the 31st, 1926,
are hereby ratified and confirmed and determined to be a reasonable
charge, and such front foot benefit charges as the same had been levied
or increased by said Commission are hereby declared to be a lien upon
the properties against which the same were charged by said Commission
and enforceable as a lien under the provisions of the law relating thereto
at the time the same were in default. The front foot benefit charge herein
levied shall not be increased nor shall any additional front foot benefit
charge be levied against the property upon which there had been levied a
front foot benefit charge as of December 31, 1926.

Whenever through error, inadvertence or oversight or by reason of any
judgment or decree any property subject to a front foot benefit charge
under this Act has not had the same levied against it or where the same
has been levied by an erroneous description, or in the wrong name, or
where service upon the owner has not been had, or where the same has
been set aside by a judgment or decree, the Commission may upon the
discovery of said error, inadvertence, oversight, or within a reasonable
time after the rendition of said judgment or decree, levy the front foot
benefit charge at the rate and in the classification that the same was orig-
inally entitled or may be prescribed by the Court to and any increase
applied to the project of which it formed a part and said front foot benefit
charge shall thereupon run for the period of years for which it would have
run if levied at the proper time or in the proper manner; and this section
shall apply to all errors, omissions, or mistakes heretofore made by said
Commission, or to any judgment or decree heretofore rendered, provided,
however, no payments have been made on such property.

In classifying property and levying said front foot benefit charge in
case of any irregular shaped lot having a frontage on two or more streets
and abutting upon a road, street, lane, alley or right of way in which
there is or is being constructed a water main or sewer at any point of said
frontage said lot shall be assessed for such frontage as the Commission
may determine to be reasonable and fair, and that any irregular shaped
lot having only one frontage may be assessed for such frontage as the