This cache can help with several challenges. Rhyme Time Challenge, California Multi Cache Challenge, and maybe more.
This is a simple 2 stage multi. GZ should take you to a city light pole upon which you will find an alphanumeric designation. Add the digits together and multiply that sum by the numeric value of the letter to get X. Subtract X from 154 to get your North coords (N38 01.xxx). Add X to 535 to get your West coords (W122 16.yyy).
Final coords check sum for ALL digits: 56.