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Warranty in California is one year only, construction defect is 10 years. Compaction is key for any concrete work. , 90 plus percent . Concrete raw materials are getting worse every year, " good" sand for example is hard to find. You should be able to get a compaction report from the builders soils engineer of record and concrete break tests from a deputy inspector on the job. If they don't have these for your areas in question then they probably didn't do them. The driveway may be considered hardscape and not covered. If the garage slab is not structural, then it could possibly be hardscape as well.
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Patrick
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