nd maintenance of the
filtration plant, including pumping the water to the filters,
parking and caring for the grounds, buildings, roads, sidewalks,
etc. The cost for the various items per million gallons pumped to
the filters is shown in Table 14, and the cost per cubic yard of
sand handled in Table 15.

_Preliminary Treatment._--Before the present filtration plant was
designed, Rudolph Hering, George W. Fuller, and Allen Hazen,
Members, Am. Soc. C. E., made an investigation and report. This
report was dated February 18th, 1901, and contained the following
paragraph:

"In consideration of the full evidence, we recommend the construction
of a complete system of slow or sand filters, with such auxiliary
works as may be necessary for preliminary sedimentation, and the use
of a coagulant for part of the time. There is no reason to believe
that the use of this coagulant will in any degree affect the
wholesomeness of the water."

Notwithstanding this opinion, considerable prejudice existed among
the citizens of Washington against the use of a coagulant, and, as
finally passed, the bill providing for the construction of the
filters did not include an appropriation for the coagulant.

~Table 13--List of Employees, Rates of Pay, and
Approximate Cost for Supplies.~
========================================================+===========
1 Superintendent | $3,000.00
1 Chief Chemist and Assistant Superintendent | 2,100.00
1 First Assistant Chemist | 1,500.00
1 Second Assistant Chemist | 1,000.00
1 Stenographer and Clerk | 1,200.00
1 Surveyor | 1,200.00
1 Laboratory Helper | 720.00
1 Janitor | 600.00
1 Chief Steam Engineer | 1,800.00
1 First Assistant Steam Engineer | 1,440.00
1 Second Assistant Steam Engineer | 1,080.00
3 Oilers, at $900 each | 2,700.00
3 Firemen, at $900 each | 2,700.00
3 Laborers, at $540 each | 1,620.00
1 Filter Foreman | 1,200.00