San Antonio - areas more/less likely to see foundation issues

[Calvin Sam]

Out of state rental property investor here looking for a better understanding of foundation issues in the greater San Antonio area.

Greater San Antonio is fairly large and spread out. Are there parts of the city or zip codes that are (generally) more or less likely to have foundation problems due to the type of soil/clay/stone houses are built on? 

For example, I've read that in Austin houses west of I-35 tend to be built on solid limestone (lower probability of foundation issues, all else equal) while east of I-35 there is more clay soil (higher probability of foundation issues, all else equal). Are there similar rules of thumb for say, San Antonio's NW side vs NE side vs South; inside the 410 loop vs. outside, etc. 

Thank you and happy investing.