Thanks for the responses. I know this guy from high school but I don't know his work other than he has built some ponds. I know he is trying to make this the most cost effective but he might be try to skimp to much. There is clay outside of the creek so I'll have my builder who ever it is tie the clay together.
And yes he said he would compact it with a small dozer no sheepsfoot . So that had me scared. Also he said he would use 6" schedule 30 sewer pipe with no anti seeping collars. I'm thinking schedule 30 sounds cheap. And no anti seap collars sounds dangerous.
After I have the land surveyed I plan on having another builder look at it.
Luckily I have no kids and don't have to pay for the land. If it cost more to do it by the book I'll pay for it.