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 telephone pole where you will find a 9 digit number. Add the first 4 digits together, add the last 5 digits together and multiply the 2 sums. Add this product to 886 to get your North coords (N38 00.xxx). Subtract that product from 508 to get your West coords (W122 17.yyy).
Final coords check sum for ALL digits: 59.