I've been looking for info on completing this table to no avail, so hopefully somebody out there can help. I'm working on a 4 story office building with future retail on the ground floor. I've calculated FTE for the 3 office floors (2nd through 4th) by counting workstations. I've used this same method on the ground floor where we have reception. For the future retail spaces, I've divided the square footage by the FTE number for employees and transients provided in LEED 2009 - C&S. The problem? Table PIf3-3 asks for Transients (students/visitors) AND retail customers. Aren't the same? And if not, how do I arrive at a number? And what exactly is the difference between peak and daily average, and how do I calculate it? I'm very confused, and can't seem to find an answer no matter how hard I look. If anyone can provide a sort of "Filling Out Table PIf3-3 for Dummies" I'd appreciate it!
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David Posada
Integrated Design & LEED SpecialistSERA Architects
LEEDuser Expert
1980 thumbs up
August 23, 2012 - 2:46 pm
One thing that helped me understand this form was to enter some test occupancy numbers, save and print the form, and then open the credit forms for SSc4.2, SSc4.3, SSc4.4, and WEp1. If you enter recognizable numbers in the PI Form 3 (instead of something like 100, 50, 100, 50, 50) you can see how those numbers gets carried over to the other credits and used in the calculations. The footnotes on the form help a lot, but may not explain it completely.
Transients have separate columns for Students/Visitors and Retail Customers because those two groups have different water use assumptions in WEp1. Retail customers are assumed to be in the building for shorter amount of time, so use restrooms less than Visitors who are assumed to be in the building longer, but not as long as an FTE person. (You can find this out in the Water Use Reduction Additional Guidance document http://www.usgbc.org/ShowFile.aspx?DocumentID=6493 )
With Simple Occupancy selected in the form, the first row of the PIf3-3 Total Daily Occupancy table is “Peak,” which you can think of as the number of transients in the building at the busiest time of day (say, lunch hour). Note that the total of this row: Students/Visitors plus Retail Customers is what gets carried into the SS credits for getting the number of bike racks.
Daily Average is confusing. It should probably say “Average of daily total transients.” Assume an average, typical day (not a slow or unusually busy day). If you counted every transient visitor and every transient retail customer who walked through the door, those numbers are what you enter in the Daily Average row. Those two numbers get carried into WEp1 to calculate how many toilet flushes and sink uses occur on an average day for transients.
In your case, Visitors are probably people coming to visit the offices on floors 2 thru 4 and Retail Customers are coming to the ground floor. The C&S Appendix 1 has a default of 0 Transient Visitors for general office, which makes little sense to me, so you’re safer estimating some number of office visitors (maybe 1 per 500 gsf? 400 gsf? Make a guess – is it a law firm or a call center? A medical office assumes 1 visitor per 330 gsf of floor area, so that’s a helpful comparison.) If it’s Core and Shell retail assume General Retail at 1 customer per 130 gross sf. Ex: 10,000 sf retail / 130 = 77 customers.