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 see a 9 digit number. Add the first 4 digits together and then add the last 5 digits together. Multiply the two sums together to get Z. Add Z to 408 to get your North coords (N38 00.n). Subtract Z from 623 to get your West coords (W122 17.w)
Final coords check sum for ALL digits: 56