The survey timing mentioned

This requirement about when building occupants are arriving at the project building is only applicable if you are conducting an in-person survey using surveyors posted at building entrances. If you are distributing your survey online or on paper, simply provide it to all shifts and ask them how they commuted to work each day for a 5-day period. You may want to add a question asking whether they are on the AM shift or PM shift for internal tracking purposes. If you choose to conduct the survey in-person, you will need to make arrangements to have the surveyors available during the separate arrival windows for the employees on the AM and PM shifts.