We want to complete another SSc4 Survey and the initial certification date was Jan. 2014.  The first Alternative Commuting Survey was completed November 2012, which would make doing a survey after Nov. 2017, too late, but if we use the initial cert. date, then we have until Jan. 2019.  Can we do another survey between now and Feb, 2019, when we submit for Recertification?  I know a lot of people are opting to just start a completely new certification, but we are trying hard to achieve a Recert., and wondering when and if we can do another Sc4 Alt. C. Survey from this date at all?