Cost for septic creation?

Call the county boys or who ever permits septics first, they might have an issue with another septic system on the property. Where I live unless you had 20 some acres there is little chance of 2 septic systems on the same property.

Seems to me that a sump for the liquid and a pump to move it through pipe to the exisiting system would be the worse case situation.

You cannot be serious.

How do you expect a ballpark with the information you give. Is the shop 100 feet or 2 miles away? Is the ditch 1' deep or is it 100 feet deep. Near the road or two miles in?

Septic can run from $5000 to $50,000 or more. Your local contractors will have a pretty good ideal when they wee it.