The Rural Voice, 2003-12, Page 21tanks that had shown some possible
problems during a 2000 study done
for Ontario Pork. That survey, by
Komex, looked at 50 pork
operations with liquid manure tanks
across the province that were 15-20
years old. Rudolph and Pagulayan
looked at six of the eight sites that
had seemed to show evidence of
excessive manure in the surrounding
soil in the earlier study.
The researchers theorized there
were a number of possible causes for
the problem and set out to
investigate, Rudolph said. They
looked for a crack in the wall or the
floor of the tank, at the possibility of
release through the system
transferring manure to the tank from
the barn, through spillage when
filling equipment or, most
frightening, he said, through a
catastrophic failure of the wall of the
tank or through overfilling.
The team did visual inspections
of the tanks while they were
empty to see if they could find
any problems. They used geophysical
surveys using instruments measuring
electrical -conductivity of the ground
and they installed monitoring wells
and took water samples.
While the 2000 study showed
plumes of manure in the six sites (a
seventh was included where an
impact on groundwater was
suspected), on investigation none
came from failures of the manure
tank. At one of the sites the problem
came from an old buried solid
manure site that was leaking into the
nearby ground. If your have one of
these facilities make sure it is
decommissioned properly, Rudolph
advised.
Problems on two other farms were
caused by runoff from open exercise
yards or feedlot areas.
One of the tanks did have a
problem where the owner had
increased the height of the tank wall
using cinderblock construction and
the porous cinderblocks were
allowing leakage when the tank was
full. That tank is now being properly
repaired, Rudolph said.
In another case there had been a
documented history of periodic leaks
from the transfer pipe which had
been recently repaired.
The two different studies over
three year's time showed the impact
of the affected areas had either
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DECEMBER 2003 17