The soils report arrives: 40 pages of boring logs, lab data, and recommendations. The engineer reads it in 20 minutes and tells you the foundation type, the budget impact, and the risks. Here's what they're seeing — and what you should ask.
What the engineer reads first
**The boring logs.** Soil descriptions by depth, SPT blow counts, groundwater levels. The engineer correlates across borings, watching for the red flags: undocumented fill, organics, soft clays, high groundwater. The logs are the ground truth; everything else interprets them.
**The recommendations.** Foundation type, bearing pressures, settlement estimates, lateral pressures, pavement sections, drainage requirements. The engineer checks whether the recommendations match the logs — and whether they're specific enough to design from (vague recommendations get RFIs).
**The limitations.** Every report lists what it doesn't cover: the borings represent points, conditions vary between them, the recommendations assume the described project. The engineer notes the gaps the design must handle.
The questions owners should ask
**"What could change the foundation type?"** The report recommends shallow foundations — but what soil condition, if found during excavation, forces deep foundations? Knowing the trigger lets you budget the contingency and watch the excavation with understanding.
**"What's the settlement, really?"** Total settlement matters less than differential — will one corner settle more than another? What's the angular distortion, and can the structure tolerate it? These numbers determine whether the foundation is adequate, not just the bearing pressure.
**"Where's the water?"** Groundwater depth, seasonal variation, and perched water — the dewatering plan, the waterproofing design, and the basement feasibility all flow from this. Reports often understate seasonal highs; ask.
**"What did you not investigate?"** The borings are 100 feet apart — what's between them? Were the borings deep enough for the proposed loads? Is there fill the borings missed? The report's scope limits are your risk inventory.
Red flags in reports
Recommendations that don't reference specific boring data. Bearing pressures without settlement calculations. "Contractor shall verify" doing the work the report should do. No groundwater discussion in a low-lying site. Lab testing that doesn't support the conclusions.
The bottom line
The soils report is the highest-leverage document in the project — a $10,000-$30,000 investigation that determines a six- or seven-figure foundation decision. Read it actively, ask the trigger questions, and never let the foundation design proceed on an inadequate investigation. The cheapest foundation problem is the one the report caught.