TM 5-814-9
(d)
The designer must consider the above
matter in the top layer of the sand
maintenance aspects of intermittent
media, then it is necessary to remove
sand filters and include in the design
and replace the solids-laden layer. The
measures for access, cleaning
sand is removed manually or with
equipment, intermittent sand filter
mechanical devices. A four-wheel-
layers, distribution piping design and
drive garden tractor equipped with a
ease of removal, and freeze protection.
hydraulically operated scraper, bucket
Monitoring. The effluent stream should be
loading device, and either flotation-
(8)
type or dual rear tires works well. The
monitored for quantity and quality at a point
decision to discard or reuse the spent
between the intermittent sand filters and the
filter sand will largely depend on local
water supply basin. If the water quality meets
availability of this material. When
the standards of the regulatory agency, it is
sand costs are high, the removed sand
allowed to flow into the wash water supply
should be stockpiled, washed, and
basin. Otherwise, it is rerouted to the
recycled. This approach is especially
equalization basin for further treatment. The
attractive in wet climates. It is also
effluent also should be tested periodically for
possible that filter effluent could be
used to clean the sand.
6-21
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