second and third optional wordings in third
sentence. When concrete plant only is required,
delete first and second optional wordings in third
sentence. When steel plant and concrete plant are
both allowed, retain all optional wordings.
This specification is structured for steel plant
only, concrete plant only, or steel or concrete
plant at the Contractor's option. Among the factors
to be considered are initial cost, maintenance
costs, life expectancy, and possible need for
relocation during period of useful life. Steel plant
is generally more economical in first cost than
concrete plant; however, maintenance costs may be
higher. Concrete plant would have a higher life
expectancy in highly corrosive soils. Small steel
plants are suitable for relocation. Concrete plant
is considered as plant having outer walls of
concrete regardless of material used for interior
walls or partitions. Steel plants are considered as
plants having outer walls of steel and bottom of
steel or concrete (except that all-steel would be
needed for relocatable plants).
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The sewage treatment plant (STP) shall include [comminutor] aeration tank,
settling tank, chlorine contact tank, aerobic digester, aeration equipment,
and other related facilities. Duplicate plants of equal size having a
combined capacity equal to the average design flow specified are
acceptable. The plant shall be basically of [steel construction, either
prefabricated or field-erected] [; or shall be of] [concrete construction,
either precast or cast-in-place]. It shall be complete and self-sufficient
except for electric power, water supply, and chlorination agent.
2.4
CONCRETE WORK
**************************************************************************
NOTE: When steel plant only is required, delete
second and third optional wordings in third
sentence. When concrete plant only is required,
delete first and second optional wordings in third
sentence. When steel plant and concrete plant are
both allowed, retain all optional wordings.
This specification is structured for steel plant
only, concrete plant only, or steel or concrete
plant at the Contractor's option. Among the factors
to be considered are initial cost, maintenance
costs, life expectancy, and possible need for
relocation during period of useful life. Steel plant
is generally more economical in first cost than
concrete plant; however, maintenance costs may be
higher. Concrete plant would have a higher life
expectancy in highly corrosive soils. Small steel
plants are suitable for relocation. Concrete plant
is considered as plant having outer walls of
concrete regardless of material used for interior
walls or partitions. Steel plants are considered as
plants having outer walls of steel and bottom of
SECTION 11375N
Page 24
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