Compton is a short drive from our base in Torrance, and most of what we're called out for here is the everyday concrete around a house: the driveway down the side, the back patio, the walk to the front door. A lot of it is older concrete that's cracked, sunk in spots or tipped so water sits against the house, and the cause is usually underneath, a base that was raked level instead of dug out and packed.
The ground itself deserves a look, too. The state geological survey has mapped zones for liquefaction, where loose, wet soil can lose its strength in an earthquake, and for surface fault rupture that cross into Compton, and work on a property in one of those zones may need the hazard studied during permitting, so before we plan a slab foundation, footing or wall, we ask the city about your lot. Water is the other thing to watch. Long Beach, the nearest long-term weather record, averages about 12 inches of rain a year over roughly 35 days, so a badly sloped slab can look fine for months and then show you exactly where it pools.