Answer: How exasperating for you! I think the most important aspect is the high water table. How high is high? If, when digging a planting hole, the bottom of the hole is soggy, the water table is too high for your arborvitates. If the water table is lower than 18-24" from the surface, your plant's roots should be okay. If it's higher than that, you'll either want to plant on a berm or install a curtain drain of sorts to redirect the water away from the roots of the plants. You could use plastic drainpipe with holes drilled all around so excess moisture can seep into the pipe and keep the soil around the roots from remaining constantly saturated. Dig a trench, line it with gravel, set the pipe in the trench and then cover it with more gravel, topping it off with about 6" of soil (so you can grow lawn over the top).
Best wishes with your arborvitaes!
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