HERBERT R. O'CONOR, GOVERNOR. 987

which a, water pipe or sanitary sewer is to be laid, into four
classes, namely: First, Agricultural; second, Small Acreage;
third, Industrial or Business, and fourth, Subdivision Prop-
erty, and the benefit charges shall be fixed and levied in ac-
cordance with the above classification; provided, however,
that no front foot benefit charge shall be levied against any
agricultural property until such property is connected with
said water pipe or sanitary sewer, and provided, further, that
when connected, the length of agricultural property to be
assessed shall be limited to 150 feet. The Commissioners shall
change the classification of properties from time to time, as
said properties change in the uses to which they are put. The
Commissioners shall be empowered and directed to make a
charge upon every building and place having a connection
with the sewerage system under their control, said charge to
be an annual sewerage service charge. All assessments and
charges, except connection charges shall be uniform for each
class of property throughout the District, shall be subject to
change annually and shall be collected by the treasurer of
Baltimore County, excepting the water service rates, which
shall be collected as already specified in Section 332. For those
water supply systems not falling under the provisions of Sec-
tions 331 and 332 but constructed and operated by the Com-
missioners, water service rates, shall be established by the
Commissioners. All front foot assessments shall run for an
equal term of years; provided, however, that any property
owner may, at his option within one year from the time said
front foot assessment or benefit charge is levied, extinguish
the same by the payment in cash, in one sum, of the propor-
tion of the estimated cost of the project of which the con-
struction abutting upon his property is a part, represented by
the number of front feet with which he is assessed, with in-
terest at the rate of six per cent per annum from the date of
said levy, less any annual payment that may have been made
thereon. The Commissioners, however, in estimating said cost
for the purpose of extinguishment, may add thereto a reason-
able margin to protect themselves against possible changes in
the cost of construction and the loss of interest. All sums
received under such plan of extinguishment shall be preserved
intact by the treasurer of Baltimore County, less the payment
of the proportion of interest and sinking fund properly charge-
able to the amount so received, and used for further construc-
tion. The said assessments and charges shall be and con-
stitute a lien upon the property chargeable with the same
until paid. All such assesments and charges, including those
past due and in arrears as well as those due and becom-
ing due in the future, excepting water service charges, which
shall be collected as heretofore specified in Section 332, shall