Regenwasserversickerung (5-6m Tiefe)

I need an assessment of the rainwater drainage on my property.
1. The introduction of rainwater into the existing combined sewer is not possible.
2. The construction of an infiltration trench (approx. 2.5 x 1.5 m) is required.
3. Due to the existing soil layers, the soil replacement for the integration of the trench must take place at a depth of 5 to 6 meters.
4. The groundwater level is sufficiently deep at approximately 10 meters.