Our post on who does what covers the basic split between an engineer and a contractor. This one is about the hillside version. On a sloped Poway lot, the job usually involves more than one licensed professional, and the hard part isn’t finding them. It’s keeping them in step.
Here’s how the relay tends to run, in order. Your job is the same at every leg: know who has the baton, and keep the paperwork.
Why hillsides need more than one expert
The City’s Safety Element is clear that geology drives development rules in Poway. Strategy B-1 calls for investigations by a qualified engineering geologist and a soil engineer on development review applications. In Friars Formation areas, a detailed slope stability analysis is also required. Not every repair counts as development review. But the same logic runs through hillside work: someone reads the ground first.
The roles, per the state licensing board:
- Engineering geologist. A licensed geologist with a specialty certification. Reads the earth materials, slope history and landslide features.
- Geotechnical engineer. A civil engineer who passed an extra geotechnical exam. Can use the title “Soils Engineer.” Investigates and evaluates soil, rock, groundwater and fill and how they interact with foundations and retaining systems.
- Civil engineer. May design most buildings and structures, plus grading and drainage. May do structural and geotechnical work if fully competent in it.
- Structural engineer. A civil engineer with additional experience who passed a separate structural exam.
The board’s consumer guide also says cities and counties usually require a licensed engineer for foundation design where soil may be a problem.
Leg 1: Someone notices
It starts with you. A crack in the patio. A retaining wall leaning. A slope that slumped after rain. Our after-rain slope walk lists what to look at.
Do: Photograph it with a date. Note recent rain, irrigation changes or leaks. Don’t: Start digging, cutting or stacking sandbags on the slope before anyone looks.
Leg 2: A first look at the house
A contractor or evaluator who works on foundations walks the property. The goal isn’t a design. It’s to answer one question: is this a house problem, a slope problem, or both?
That first visit should produce plain notes. What moved, where, and roughly how much. If the answer is “the slope is involved,” the next leg starts.
If it’s only the house, the relay may be short. A cracked slab on a flat pad doesn’t always need a geologist. But on a lot with a slope above or below the house, it’s better to ask the question early than to redesign a repair later because the ground wasn’t what anyone assumed. Ask the evaluator to say in writing which of the two it looks like, and why.
Leg 3: Reading the ground
This is where the geologist and the geotechnical engineer come in. Sometimes one firm covers both. They may:
- Review geologic maps. Our post on Poway landslide maps explains those.
- Pull old soils and as-graded reports for the lot.
- Drill, dig test pits or sample soil.
- Write a report with findings and recommendations.
Do: Ask what the report will cover before it starts. Ask whether it will give design values a structural or civil engineer can use. Don’t: Let the scope get set by phone with no written proposal.
Leg 4: Designing the fix
With the soils report in hand, a civil or structural engineer designs the repair. That might be piers, a new retaining wall, underpinning or drainage. The design should point back to the soils report. If it doesn’t reference it, ask why.
Plans are sealed and signed by the engineer who prepared them. That’s a state rule. Nobody else’s stamp substitutes for it.
Leg 5: The permit
Poway’s grading page says grading permits are required for excavations 2 feet or deeper with slopes steeper than 2:1, moving 50 cubic yards or more, or changing drainage patterns. A qualified professional engineer prepares the grading plan. Retaining walls need building permits.
This is where the relay often stalls. City reviewers send comments. Comments go back to whoever drew the plans. If the soils engineer has to answer something, the question needs to reach them, not sit in an inbox.
Do: Keep one list of open plan-check comments and who owns each one. Don’t: Assume the engineers are talking to each other. Often they’re waiting on you.
Leg 6: Inspection during the work
The building code requires special inspections and tests of soils for many projects. Section 1705.6 covers site soil conditions, fill placement and load-bearing requirements. It says the approved geotechnical report and the construction documents are used to check compliance.
In plain terms: the soils engineer or their inspector may need to look at excavations before concrete goes in. They may test compaction on fill. That needs to be scheduled into the work, not tacked on.
Do: Ask who calls for each inspection and how much notice they need. Don’t: Pour or backfill before a required observation happens.
Leg 7: Closing the file
At the end, collect everything:
- The soils or geologic report.
- The sealed plans and calculations.
- Inspection and test reports.
- The final permit sign-off.
- Photos of the work before it was covered.
This file is worth a lot. It helps at resale. It helps the next time something moves. Store a copy outside the house.
Where things go wrong
From what we see, the relay breaks in a few predictable spots:
- The soils report and the design don’t match because they were done years apart.
- A plan-check comment for the geotechnical engineer never reaches them.
- Fill gets placed without testing.
- The final paperwork never gets collected.
None of that is about anyone being careless. It’s about nobody being assigned to hold the whole thing together.
Our part
We handle the foundation and wall work, and we keep the relay moving. We coordinate with licensed engineers as needed, share field observations with the people designing the fix, and keep the schedule built around required inspections. We don’t do the geology or seal the design. That’s their job, and it should be.
Our pages on hillside foundation repair, retaining wall repair and foundation inspection explain the work itself.
We work on hillside lots all over Poway. If your slope or wall has started to move, ask for a Free Quote and we’ll help you figure out who needs to be on the team.