New Sod and brown spots :(
my husband put down brand new sod two weeks ago. He started by leveling off the backyard and then put down new soil, sprinklers and then finally sod. He used a roller and started watering. This last week or so we have had these brown spots all over the lawn. The ground is wet so we know it is getting water but now we are stumped! He then put down some fertilizer and that has not helped. We have out a lot of $$ into this yard and really don't want it to be for nothing. We chose a California Blue grass that is suppose to be drought resistant and needs less water over time but initially it is suppose to need the water to help it take. I have attached a photo for reference.
Thanks in advance!