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snow load surcharge

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Should the full ground snow load (Pg) be added as a surcharge on the soil
when desiging retaining walls? 

A friend of mine called me the other day and asked me this question, when I
told him that I did add a surcharge for snow, he ask me why?  He said has
done hundreds of retaining walls in this area over MANY years without this
surcharge and there never been any problem with any of the walls.  He
offered a possible explaination in that full active soil presssure is
achieved over a longer period of time, and full Pg usually only occurs for
less than a month.  Of course it could also be that the traditional way that
we design walls is conservative enough to account for this short term
loading without any adverse effects.  The typical Pg in this area is 200psf
and up.  I would appreciate opinions.

Randy Vogelgesang S.E. 
South Lake Tahoe