Appendix 4- SWMP

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                                          5.    Installation and assembly

5.1       Construction site
Under all circumstances, the following points must be clarified prior to installation:
      •    The structural suitability of the ground according to DIN 18196
      •    Maximum groundwater levels which occur and drainage capability of the subsoil
      •    Types of load which occur, e.g. traffic loads
An expert ground report should be requested from the local planning authority to determine the physical
characteristics of the subsoil.

5.2       Trench
To ensure that sufficient space is available for working, the base area of the trench must exceed the
dimensions of the tank by > 100 mm (3.9 inch) on each side; the distance from solid constructions
(e.g. foundations of the house) must be at least 1000 mm (39.4 inch).
If the depth of the trench is > 1250 mm (49.2 inch) an embankment must be designed according to
DIN 4124. The construction site must be horizontal and plane and must guarantee sufficient load-bearing
capacity.
The depth of the trench must be dimensioned so that the max. earth coverage (see point 2 – installation
conditions) above the tank is not exceeded. To use the system throughout the entire year, it is necessary
to install the tank and those parts of the system which conduct water in the frost-free area. The frost-free
depth is usually approx. 600 – 800 mm (23.6 – 31.5 inch); precise information in this regard can be
obtained from the responsible authority.
A layer of compacted, round-grain gravel (grain size 8/16, thickness approx. 100 – 150 mm;
3.9 – 5.9 inch) is applied as the foundation.

5.2.1 Slope, embankment, etc.
On installation of the tank in the immediate vicinity (< 5 m;
196.9 inch) 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 (19.7 inch) in all directions, and must be
located at least 1000 mm (39.4 inch) away from the tank.


5.2.2 Groundwater and cohesive (water-impermeable)
      soils (e.g. clay soil)                                                                  >700 <1200 mm
                                                                                              >27.6 <47.2 inch   |

If it is anticipated that the tanks will be immersed deeper into
                                                                                         Max.                        Max.


the groundwater than is shown in the adjacent figure,
sufficient dissipation must be ensured. (See table for max.
immersion depth).
Dissipation of the drainage water (e.g. via an annular
drainage system) is recommended in the case of cohesive, water-impermeable soils.
                             1500 L              3000 L         5000 L         7500 L
 Tank
                           396 US-gal          793 US-gal    1.321 US-gal   1,981 US-gal
                              700 mm            735 mm         1000 mm       1250 mm
 max. immersion depth
                              27.6 inch         28.9 inch      39.4 inch     49.2 inch


5.2.3 Installation adjacent to surfaces used by vehicles
                                                                                         >H
If the underground tanks are installed adjacent to surfaces
which are used by heavy vehicles weighing over 3.5 ton, the
minimum distance away from these surfaces is at least the                                                            H

depth of the trench.



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