If you need your elevation certificate for flood insurance. I know a great agent that can help you review your certicate and help you same money in your policy. I have actually called Gwinnett County Zooning and Developement Department asking for a copy of it. My client's home was built in 2006 and I was told they do not keep records anymore. If you need a good surveyer let me know. I should have their contact information in my records.
Try to contact Gwinnett county: http://www.gwinnettcounty.com/portal/gwinnett/Departments/Pl
Any local survey company can help you, hopefully, for no charge. Keep in mind that for the most part of GA elevation certificates were done in the 90's. Impervious ratio has changed significantly since that.