determination of the amount of sand (filter pack and/or foundation
material) a well is producing shall be performed. Prior to starting the
sand test all material shall be removed from the bottom of the tailpipe.
The Contractor shall test each well by pumping at a rate [of [_____] L/sgpm
] [sufficient to produce approximately [_____] m feet of draw-down]. After
the pump is at the desired pumping rate the flow from the discharge shall
be diverted [into a container that will collect all the sand being carried
by the water][through a Rossum Sand Tester]. Development of the well is
satisfactory if the amount of sand collected is less than 0.5 L per 100 000
L 1 pint per 25,000 gallons of water pumped at the specified rate. Upon
completion of the test the amount of sand in the tailpipe shall be
determined to verify that no material is being deposited in the bottom of
the well.
3.7.3
Filter Pack Sampling and Testing
The Contractor shall verify that all materials conform to the
specifications before delivery to the project. The particle size
distribution of the filter pack shall be sampled and tested by the
Contractor in accordance with ASTM C 136 and ASTM D 75. [Prior to delivery
to the project site, at least two samples of material should be collected
and tested for every 700 metric tons 750 tons (2000 lb) produced under this
contract.] [Within 48 hours before being placed in the relief well to be
back-filled, the filter pack shall be sampled from the material stockpiled
at the project site. There shall be at least one particle size
distribution test on the filter pack for [each well] [every [_____]
wells].] A pump test shall be performed in accordance with technical
provisions herein specified.
3.7.4
Reports
Reports shall include, for each relief well, logs of the boring, elevations
of the well screen, top of riser pipe, bottom of the tailpipe, filter pack
gradation, quantity of filter pack added during development, pump test,
sand test, and report of backfilling. The elevation of changes between
materials on these logs shall be to the nearest 30 mm. 0.1 foot The log of
backfill material shall include the filter pack particle size distribution
test data, and notes concerning installation and development of the relief
well. The pump test log shall include the duration of the test and rate of
flow in L/s gpm, and the draw-down response data with time in the pumped
well, in adjacent wells, and in nearby piezometers. The relief well log
and the pump test log shall be submitted to the Contracting Officer as part
of the weekly quality control report specified in Section 01451A CONTRACTOR
QUALITY CONTROL. The Contractor shall also submit a report of the well
installation to the appropriate public agency and in the form required by
state statutory and/or regulatory requirements specified in paragraph
REGULATORY REQUIREMENTS.
-- End of Section --
SECTION 02525A
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