Can you have a SEP Plan and a 401(k) Safe Harbor Profit Sharing Plan and be a Sole Proprietor Company?

[Jilliandiz]

Employer is a Sole Proprietor, with a Schedule C needed to calculate the annual SEP contribution. He would like to also have a 401(k) Safe Harbor Profit Sharing Plan....is that possible to have both plans active???

2 HCE's

2 NHCE's..

Help!!!!