be in accordance with the Standard Performance Evaluation Method based on
the subdivision flow pattern as established by the NSF.
1.6.8
Package Sewage Treatment Test Reports
A certified test report by NSF or an independent laboratory for the package
sewage treatment plants shall accompany all proposals. This certification
shall include a true copy of the tests performed as stated in paragraph
entitled "Quality Control," and shall state whether any deviations from the
tests required were made. It shall also state what effects, if any, plant
size or capacity will have on the results of the plant tested. This
certification shall be signed by at least two officials of the organization
making the tests.
1.6.9
Tank Tests
**************************************************************************
NOTE: Delete last sentence when concrete plant only
is required. 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).
**************************************************************************
Submit a test report stating that (1) the aeration, settling, and aerobic
digester tanks of the prefabricated steel plants have been provided
watertight, (2) welds are sound, (3) the finish is smooth, and (4) tanks
have been shop painted in accordance with the specifications before the
tanks are shipped to the site shall be submitted to and approved by the
Contracting Officer before work is started.
1.6.10
Electrical Control System
Attest
that the electrical control system and its components are wired for
motors
and controls in accordance with specification requirements for
manual
and automatic operation of sewage treatment plant equipment for
proper
operation.
1.6.11
Diffusers
Submit certification that the diffuser layout has an oxygenation capacity of
1.36 kg 3.0 lb for fine bubble diffuser and 0.68 kg 1.5 lb for coarse
bubble diffuser of oxygen per electrical input watt per hour horsepower per
hour, when tested under standard conditions in cleartap water at 20 degrees
C 68 degrees F, zero dissolved oxygen (D.O.) 3 m 10 feet liquid submergence
and flow rates of 0.6 L/s 1.25 cubic feet per minute for fine bubble and
SECTION 11375N
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