Insertion And Filling - Graf Carat XL Notice D'installation

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5.2.1 Slope, embankment, etc.

On installation of the tank in the immediate vicinity (< 5 m) of

a slope, earthen mound or slope, a statically calculated

supporting wall must be erected to absorb the soil pressure.

The wall must exceed the dimensions of the tank by at least

500 mm in all directions, and must be located at least

1000 mm away from the tank.

5.2.2 Groundwater and cohesive (water-impermeable)

soils (e.g. clay soil)

With only occasional ground water and cohesive, water-

impermeable soils (e.g. loam), adequate drainage of the

ground water or leakage water must be ensured so that the

tanks never stand deeper in the ground water than indicated

in the table. If necessary, the drainage line must end in a

vertical DN 300 pipe in which an immersion pressure pump

is installed to pump off the excessive water. The pump must

be checked at regular intervals. If it is to be expected that

the tanks could sink lower, adequate drainage must be

ensured in all cases. We recommend the general laying of a

drainage line, since in the event of prolonged rainfall the

ground water level can rise unexpectedly.

Installation adjacent to surfaces used by vehicles

If the underground tanks are installed adjacent to surfaces

which are used by heavy vehicles weighing over 12 t, the

minimum distance away from these surfaces is at least the

depth of the trench.

5.3