The Borit tool really saved me! Quotes from sprinkler companies (if they ever showed up..) were about $1,000 for a 14 ft driveway, no obstructions. For that price I could cut and cover and repave the whole driveway. I bought a Borit from the manufacturer on their Ebay site. Using the trench previously made by my ditch witch rental, we lined up the Borit, combined a 10 and 4 ft section of 3/4 inch pipe, and a 3/4" right angle drill from Home Depot rentals and in about 20 minutes we reached the other side. At first we hit a gravel lense in the subbase so I lifted the pipe a bit and dove under the gravel coming out through stiff clay about a foot lower on the other side which for the sleeve insertion didn't affect anything. Used a 3" inch Borit bit which allowed for a 2" sch 40 PVC sleeve. This sleeve had room for a 1 1/4" supply line and controller cable to be run under the drive.
The Borit didn't fit the 1/2" industrial B&D drill I first rented, and that drill was too wide for the 4" trench. The 3/4" right angle drill had more torque and the right angle feature kept the motor above the ditch and water backflow. We dug a short and deep side trench hole at the bore site to capture the water backflow and it helps to have someone bailing that hole with a half gallon milk jug while drilling is underway. It took about 20 minutes! The Borit is well worth the investment even for a one time use!
Now that my system is running several neighbors are planning theirs and I am sure I can sell the Borit to one of them.