I've worked with these folks a number of times over the years. I'm not sure why you need a soils engineer. Generally they come in on the front on new construction projects. Or they are often used for drainage, erosion and foundation related issues.
If it is a drainage, soil erosion or foundation issue the soils engineer will do a field study and come up with his recommendations to correct those issues. If the soils problem is impacting your home (structure) you will also need a good civil and/or structural engineer to perform the same service for you on those issues.
When and if they come up with any repair or retrofit recommendations keep us in mind. We've been dealing with those type of repair issues for 25 years and have done hundreds of drain systems and foundation retrofits. Take a moment to check out our websites below.
Here's the contact info for one of the oldest and best established soils engineering firms in San Diego.
Vinje & Middleton Engineering
2450 Auto Park Way, Escondido, CA 92029