eral Government in
contingency plans for spills of oil and other hazardous substances
in the Basin also is required.

(5) Adoption and implementation of regulations and requirements by
local and State authorities for control of pollution from boats and
marinas. Legislation under consideration by the Congress would
permit establishing national standards for control of pollution by
vessels.

(6) Adoption and implementation by State and local authorities of a
policy that will prevent significant quality deterioration in high
quality waters.

b. Accomplishment of these measures will go far toward assuring a
clean Potomac. However, to protect the Basin's waters over the long
run, even more must be done.

(1) First must come research and investigations to seek better
methods of control where existing information and technology are
inadequate. This includes:

(a) Continuation of current pilot plant demonstration studies of
advanced waste treatment processes at Piscataway, Prince William
County, Virginia, and District of Columbia waste treatment plants
and completion of the chemical, biological, and physical studies of
the estuary to establish a basis for upgrading water quality to the
maximum feasible degree.

(b) Continuation of investigations and demonstration projects to
evaluate costs and effectiveness of methods of treating and
controlling combined and storm sewer discharges from urban areas,
particularly Washington, D.C., to provide cheaper and more
effective solutions as partial alternatives to present long-range
programs of separation of sanitary from storm sewers in the
metropolitan area.

(c) Initiation of an engineering study or demonstration project to
investigate practicable and acceptable means of disposing of sludge
from conventional and advanced waste treatment plants.

(d) More complete delineation of sources of nutrients to the
free-flowing streams of the Basin and evaluation of methods of
nutrient control or reduction. Continued research on nutrient-algal
relationships to better define the principal chemical factors which
result in nuisance algal growths, particularly in the Potomac
estuary.

(e) Completion of a survey of agricultural waste sources in the
Basin, both organic and chemical, and the app