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In addition to the legacy report, the following guidelines are to be applied:
- Expansive soil or loose soil behind a proposed wall will have to be carefully investigated before installing block wall.
- If there is a potential for a high water table, a perforated drain pipe is used to divert water behind the wall at the base.
- A concrete swale above the wall is required on slopes to drain surface water away.
- Tree roots behind the wall need to be removed or not allowed to expand close behind the wall.
- Base courses set up mid-slope can be installed with additional recommendations for a stable wall.
- A retaining wall less than 27 degrees and a minimum tilt of 10 degrees will require a soils report and structural calculations by a registered engineer.
- Open-spaced block assembly with a 6″ crushed rock backfill behind the wall will not have a problem with gophers or other rodents yet still allow plants to grow inside pockets created between blocks.