If you are running 120v then I seem to recall Irvine code is 24 inches below grade. Some electricians will not trench the line and you may have to hire a landscaper to do that. If you decide you want to do the work outside of code requirements (which I don't recommend for sale disclosure reasons) then you may want to communicate that first to the electrician as some will not want to install electrical that is not to code as it carries potential liability and licensing issues for the electrician.
It is not cheap to retroactively install electrical outlets according to code. A cheap alternative may be to install an outdoor power outlet extension coupled with a 50ft outdoor rated extension cord. $50 and you're done.
https://www.amazon.com/Kasonic-Weatherproof-Extension-Certified-Multi-Outlets/dp/B07F23SW7F/ref=asc_df_B07F23SW7F/?tag=hyprod-20&linkCode=df0&hvadid=242041198988&hvpos=&hvnetw=g&hvrand=5207064292960932195&hvpone=&hvptwo=&hvqmt=&hvdev=c&hvdvcmdl=&hvlocint=&hvlocphy=9031533&hvtargid=pla-472075255841&psc=1