1078                             Laws of Maryland                       [Ch. 644

interim receipts or temporary bonds, with or without coupons ex-
changeable for definitive bonds when such bonds have been executed
and are available for delivery. The Commission may also provide
for the replacement of any bonds which shall become mutilated or
be destroyed or lost. Bonds may be issued under the provisions of
this sub-title without obtaining the approval or consent of any
department, division, commission, board, bureau or agency of the
State of Maryland, and without any other proceeding or the happen-
ing of any other condition or thing than those proceedings, con-
ditions or things which are specifically required by this sub-title. The
provisions of Sections [32 to 34] 9 to 11, inclusive, of Article 31 of
the Annotated Code of Maryland, [1951] 1957 Edition, as amended,
shall not apply to bonds issued under the provisions of this sub-title.

(d) In the event that the funds available to any District from all
sources established by this sub-title for the payment of the principal
of and interest on outstanding bonds of such District are insufficient
for any reason to meet such principal and interest payments on the
outstanding bonds of such District, the governing body or bodies of
the county or counties which have guaranteed such bonds shall levy
and collect, in each and every fiscal year in which such bonds are
outstanding, ad valorem taxes upon all the assessable property within
the corporate limits of such county or counties in rate and amount
sufficient to provide for such payments, when due, together with
accrued interest to the date of payment. In the event the proceeds
from the taxes so levied in any such fiscal year shall prove inadequate
for the above purposes, such county or counties shall levy additional
taxes in the succeeding fiscal year to make up any deficiency.

655.    No District shall be required to pay any taxes or assess-
ments upon any project acquired, constructed or operated by it
under the provisions of this sub-title or upon the income therefrom,
and the bonds issued under the provisions of this sub-title, their
transfer and the income therefrom (including any profit made on the
sale thereof) shall at all times be free from taxation by the State of
Maryland or any of its political sub-divisions, or by any town or
incorporated municipality or any other public agency within the
State. No District shall be required to pay any taxes or assessments
at the time of, or by virtue of, its incorporation, but a District may
be required to pay usual filing or recording fees and similar service
charges made in connection with the filing of required corporate
documents.

656.    Whenever the plans and specifications for water [supply,]
or sewerage [or drainage] systems for any sanitary district shall
have been completed and the Commission shall have decided, after
opportunity for a hearing has been given, to proceed with the con-
struction thereof, it shall advertise, by notice in one newspaper pub-
lished, or of general circulation, in the county or counties where the
sanitary district is located and such newspapers and technical press
as it may deem proper, for bids for the construction of said system
or systems, in part or as a whole, as in its judgment may appear
advisable. The contract shall be let to the lowest responsible bidder,
or the Commission may reject any and all bids, and, if in its discre-
tion the prices quoted are deemed unreasonable or unbalanced, it
may re-advertise the work or any part of it or may do any part or
all of the work by day labor; provided that at any time the Commis-
sion may, in its discretion, expend for construction work, including