The Rural Voice, 2006-04, Page 423
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CropAdvisory.com
Mervyn Erb
CPCC-I, CCA, CAC
Brucefield, Ont.
519-233-7100
&
Andy Megens
PAg, CCA
St. Marys, Ont.
519-284-3199
Michael Hunter
CCA
Susan Gagne, CCA
GIS Specialist
Ripley, Ont.
519-395-0254
&
Jane Zilke
Tavistock, Ont.
519-462-1433
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38 THE RURAL VOICE
Outdoor manure storages must be
sized big enough to handle
precipitation.
agitated, says Don Hilborn,
OMAFRA by-product management
specialist.
. At least two levels of underground
protection are required for permanent
liquid storages. The above -ground
portion of the tank must have
secondary containment or additional
strength.
Most of the design must be carried
out under the supervision of a
professional engineer and some
aspects may involve a professional
geoscientist to look at possible
complications with groundwater.
The first step for the
geoscientist, is to look at the
type of soil and the water table
in the location. A small drilling rig is
brought to the site to take samples
down to a 15-20 foot depth. The
samples indicate that the water table
is present. Experts look for a change
in colour of the soil whichcan mean
saturated soil. They look for clay,
silt, sand or a mixture of the different
soils.
The more clay present, the better
for ensuring the safety of the
surrounding environment. Clay can
form a barrier to the passage of
liquids. Lighter soils mean other
precautions need to be taken.
In some sites an engineer may
have to use a synthetic, geosynthetic
of compacted soil (usually clay) liner
to provide the safety barrier against a
failure of the tank.
The investigation also seeks to see
how close the aquifer is to the
surface. The geoscientist also maps
out all the wells in the area.
Uncovered tanks have higher
minimum distance setback
requirements than tanks under the
floor of the barn, but this can be
reduced if the tank is covered. This
also eliminates the problem of the
contents being swelled by
precipitation.