should be used for plants in 4.38 to 6.57 L/s
100,000 to 150,000 GPD range.
10. Whether raw sewage recirculation box
(recirculation to pumping station) is needed.
11. Whether plant is to be of aboveground or
belowground construction.
12.
Seismic loading (if necessary).
13.
Electric power characteristics for motors.
14. Whether automatic operation of air lift pumps
should be required.
15. Wind load and ice load for rotating sludge
collector.
16. Organic loading (5-day BOD) if other than that
given in the text.
17. Total suspended solids if other than given in
the text.
18. Size of hypochlorite mixing tank if larger
capacity than 113.4 L 30 gallons is needed.
19. Size of hypochlorite solution tank if larger
capacity than 208 L 55 gallons is needed.
20. Whether, for extended aeration type plant,
eventual conversion to step aeration type is
anticipated.
For plants below 0.66 L/s 15,000 GPD capacity,
hopper bottom only should be specified for settling
tanks. For plants above 4.38 L/s 100,000 GPD
capacity, mechanical sludge collectors only should
be used in settling tanks. For plants between 0.66
L/s and 4.38 L/s 15,000 and 100,000 GPD capacity,
either hopper bottom or mechanical sludge collector
should be allowed as a Contractor's option.
However, of the various types of mechanical sludge
collectors, rotating sludge collectors appear to be
available for plants of 1.31 L/s 30,000 GPD and
above; chain-and-flight, 1.75 L/s 40,000 GPD and
above; traveling reciprocating type, 0.66 L/s 15,000
GPD and above.
**************************************************************************
**************************************************************************
NOTE: Delete paragraph and subparagraphs thereto
for extended aeration type below 0.66 L/s15,000 GPD
capacity.
**************************************************************************
**************************************************************************
NOTE: Delete first sentence when step aeration type
SECTION 11375N
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