Just about the worst possible time you could consider for doing this but sometimes it just is what it is!! Will they survive? Maybe, maybe not. Have the new locations already prepared, dig and replant as early in the day as possible and get them back into the ground ASAP. Don't bother with trucking home soil from the old place - it won't help, could just complicate things and adds extra time unnecessarily to the project.

Water in well at planting time and keep the soil moist (not wet) through the rest of the summer. And keep your fingers crossed!

Rigging up something to shade at least part of the tops this first summer might be worth it, too, once you have bothered with the rest of the operation. Meanwhile they are going to be hugely heavy, you will need a method that can address this aspect.

3' away from the trunk - 6' diameter - will give you a root ball weighing at least 1000 lbs if you included the soil! I think this is going to more work than you think.

(a tree I bought recently had a 30" diameter rootball, and could be barely be lifted by my roughly 500 lbs capacity FEL/pallet forks combo. Ballast box had to be filled with 6 pieces of 50-60 pound granite, of course.)

wrong season .. wrong size, short of using a mechanical tree spade .. and frankly just too much work ...imo ...

skip it .. odds of success are really low ...

but hey.. if you are young.. dont mind the exercise [otherwise known as backbreaking labor].. go for it ...

see link about proper planting ... nothing there about the extra 100 pounds of soil you want to carry around ...

this sums it up ... a root mass can be 2 to 3 times the tree above ... and you will be cutting off 99% of it .. just weeks before the heat of summer hits.... not to mention this conifer is evergreen ... so in the 3 to 5 years it takes to regrow the root mass .. there are high odds.. that it will lose a lot of green leaves ... which means it wont be able to convert sun to power.. to grow the roots.. etc ...

to repeat... imo... skip it .. odds of success are really low ...

ken

https://sites.google.com/site/tnarboretum/Home/planting-a-tree-or-shrub