operating tests shall be carried out to assure that the pumping
installation operates properly. Tests shall assure that the pumping units
and appurtenances have been installed correctly, that there is no
objectionable heating, vibration, or noise from any parts, and that all
manual and automatic controls function properly.
3.7
DISINFECTING
After completion of tests of well, or installation of permanent pump, or at
time of tests for yield and drawdown test, whichever is later, the wells
shall be disinfected by adding chlorine, conforming to AWWA B301, or
hypochlorite, conforming to AWWA B300, in sufficient quantity so that a
concentration of at least 50 ppm of chlorine shall be obtained in all parts
of the well. Chlorine solution shall be prepared and introduced into the
well in an approved manner and shall remain in the well for period of at
least 12 hours but not more than 24 hours. Information on methods for
preparing chlorine solution and introducing it into the well may be found
in AWWA C654. After the contact period, the well shall be pumped until the
residual chlorine content is not greater than 1.0 ppm. The well shall be
pumped to waste for an additional 15 minutes with less than 1 ppm chlorine
residual after which two samples shall be taken not less than 30 minutes
apart and tested for the presence of coliform bacteria. The well shall be
disinfected and redisinfected as may be required until two consecutive
samples of water are found upon test to be free from Coli Acrogenes group
of organisms.
3.8
PUMPHOUSE AND SLAB
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NOTE: In some instances, a pumphouse and base slab
may not be appropriate. In such cases, alternate
designs must ensure that surface water cannot
infiltrate into the well and that the pump and well
head are protected.
**************************************************************************
Pumphouse and slab shall be constructed preventing the infiltration of
surface water or precipitation into the well. The slab shall be [1.2]
[_____] m square by [150] [_____] mm thick [4] [_____] feet square by [6]
[_____] inches thick and constructed of reinforced concrete. The top of
the outer casing shall extend [300] [_____] mm [12] [______] inches above
the top of the slab. The top of the slab shall be at elevation [_____] or
higher. The pumphouse shall be constructed on the slab and thermally
insulated.
3.9
SITE CLEAN-UP
After completion of the work, tools, appliances, surplus materials,
temporary drainage, rubbish, and debris incidental to work shall be
removed. Excavation and vehicular ruts shall be backfilled and dressed to
conform with the existing landscape. Utilities, structures, roads, fences,
or any other pre-existing item which must be repaired or replaced due to
the Contractor's negligence shall be the Contractor's responsibility;
repair or replacement shall be accomplished prior to completion of this
contract.
3.10
DRILLING WASTE DISPOSAL
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SECTION 02521
Page 33
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