Last fall they dug up a section of our front lawn to replace the gas
service. This winter the town plow did its usual fine job of tearing up the
front 6 feet of our lawn near the road. A contractor for the utility came
by a few weeks ago, raked it all out, added some top soil and hydroseeded
the area. We're talking about roughly 1000 sq ft. Everything was done to my
satisfaction - other than the hydroseeding.

After about 10 days of twice-a-day watering, it is readily apparent that
they applied the hydroseed very unevenly. There are bare spots and thin
spots all across the area they "fixed". I now have to add seed to fill it
in. The new grass is about 3" tall, almost ready to be mowed, but I now
have to over seed most of the same area.

What's the best way to fix this? Seed and keep watering twice a day even
though I won't be able to mow? Can I use starter fertilizer or will that
hurt the grass that has already come in? Should I care about the existing
new grass or should I just seed and fertilize as if it was bare?

Since the roots can't be too deep I guess I could just rake it all under
and start over, letting the existing thin grass feed the new seed. Good
idea, bad idea or waste of time?