Hi Stephen,
Don't run the grounds the way you described. If you ad an extra ground rod do it at the main service. Make sure you bond the new ground rod to your existing ground rod. Two ground rods are a bit much IMO. Feel free to research some of my tech talk threads for helpful hints on dedicated circuits. Sean, others and myself have discussed this subject more than once. I think we covered every possible scenario. My suggestions stem from over 20 years as an Electrician.
Don't run the grounds the way you described. If you ad an extra ground rod do it at the main service. Make sure you bond the new ground rod to your existing ground rod. Two ground rods are a bit much IMO. Feel free to research some of my tech talk threads for helpful hints on dedicated circuits. Sean, others and myself have discussed this subject more than once. I think we covered every possible scenario. My suggestions stem from over 20 years as an Electrician.