My client has been LEED Credit-mapped by another party. They had conducted an informal commute survey taking option 3. The survey questionnaire asked for which mode of transport the staff used for "most of the week (3-4 days)" and not 5 days in the week, therefore does not have a daily tally. They got a good response the last time (~75%) and had favorable results since the project is highly accessible to mass transport and located near major thoroughfares, but the client is not too keen on conducting a new survey given that the survey was done fairly recently, and feedback will not likely be as good.

Will the survey be sufficient? - it is able to clearly indicate how many are driving alone to work but there is no 'per day' tally. What other alternatives are there other than conducting a new survey?