Please Help - Arborvitae 'Emerald Green' Trees with Dark Spots

Had these Arborvitae 'Emerald Green' trees planted about 5 weeks ago and not sure what's wrong with them.

Live in Zone 7b and it has been super hot and dry for the most part but I've been trying to water them regularly. Was worried I was watering too much (they got planted with new sod) so I pulled back to a deep water about once a week, but now some areas are turning brown as well like they're not getting enough.

They get direct sun most of the day.
 

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