While it wasn't obvious how erosion control could be achieved with Option 4, the option in effect said to the City: "Go back, do some more detailed planning, and find a way to do the job that's not so destructive to trees, wildlife, and the stream. That's why Option 4 adds "Preserve wildlife habitat" to the objectives. Since the original objectives didn't include wildlife, it's not surprising the City's Option 2 (riprap) is destructive to wildlife.
Features of Option 4
- Line existing sanitary sewer and laterals. (Do spot repairs & replace sections if needed.)
- Cover or retrench the main sewer and laterals if too exposed.
- Stop erosion within the existing stream channel using natural boulders, and adding terraces where steep.
- Save existing wildlife habitat (including pools, dead trees, stumps) where possible, and reconstruct (mitigate) any lost habitat.
- Least expensive option.
- Preserves the most trees.
- Security benefit (no road).
- Repairs, preserves, and protects from freezing the main sewer and laterals.
- Minimizes erosion.
- Least amount of disturbance to wildlife habitat.
- Difficult (but not impossible) access for sewer repair.
- Excludes using large construction equipment.
- Some future maintenance may be needed.
- Wildlife isn't our responsibility.
- We can't get in there, to put in a new sewer line, and fix the erosion, and still preserve the natural streambed.
- Referring to the erosion: "If your roof has 100 leaks, maybe it's better to replace the roof than to just patch the leaks."
- There would still be problems with the lateral sewage lines.