Answer: Once you've eliminated the standing water, the gnats and mosquitoes should be eliminated, as well. The installation process of your new sod wasn't very professional, but the sod should root well and be fine by next growing season. You can either call the landscaping company and ask them to repair the low spots, or peel the sod up and do it yourself. Although the sod will probably have rooted in the low spots, you should still be able to lift and roll it up, put enough topsoil down to raise the sod enough to be level with the rest of the yard, then reset the sod. As for watering - twice a day for 5 minutes is a good formula for the first few weeks while new sod is establishing its root system, but excessive for established sod. Set your sprinklers for 10-15 minutes once or twice a week (depending upon weather). The goal is to water deeply but infrequently to force the roots to grow deep so they're more drought-tolerant and less dependent upon frequent, shallow watering.
Best wishes with your lawn!
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