Not knowing your geographical location, type & size of facility, title of position, hours, etc. it is impossible to make any estimates of what you can expect to be offered.
A job offer letter should contain the following information: Title of position, number of hours to be worked per pay period, expected shift (and differential, if applicable), weekend and holiday work requirements (and diff, if applicable), information on accrual of PTO (or vacation/sick/holiday time, such as # of hours earned per pay period), information on health benefits such as major medical/dental/vision (including approximate cost per paycheck), information on optional benefits such as 401K, disability insurance, etc., cost of parking (if applicable).
The letter should also indicate to whom you should respond and in what time frame to accept or reject the offer. It may include a start date, or indicate that a start date will be discussed.
You can check with former classmates, teachers or others working in the area to see if the offer amount seems consistent with local norms. As a new grad, you will have very little negotiating room, and may be forced to either take it or leave it.
Hope this helps.