Paper instructions:

Hi,
Got this back from professor

This is much better, but we need to be clear about the methods here. You say you are using mixed methods but I can only see mention of surveys. If you are just using surveys, this is not mixed methods and you will need a sample of more than 30. For just surveys I would suggest you need at least 70 returned surveys. You also need to consider that a good return rate is 30%, and then account for this is the sample size.