Phil,
 
Be very cautious with the promises you make in restoring these stairs. White Carrera is probably one of the worst choices of marble for this location because of its vulnerability to "stunned crystals" caused by pin pointed impact. These stunned crystals can look like a scratch but can go far below the surface of the marble making removal impossible with exception to routing out the damage and filling with a matching epoxy.
As far as the right tool for the job, I would suggest the DS-301 machine at this link https://ecom.granquartz.com/VIA9/viaListProducts.jsp?stackTitle=DS301^3-Head^Polisher&searchText=0388&reqTitle=TITLE_VIAUSERDOCLIST
It's expensive but with the price you charge for this job, it will pay for itself immediately.
 
Beau
Set in Stone Restoration

On Wed, Mar 26, 2008 at 6:49 PM, Phil Campbell <phil@campbellsstonerestoration.com> wrote:


Need some advice on bid. Looked at a old marble floor and stairs, about 50 yrs old, White Carrera I think. It is in bad shape but I'm ok bidding the floor but the stairs I don't know, there are 15 of them about 8 ft wide with 2 6x6 landings The stone is about 1 inch thick and is on the risers too. heavy wear pattern
total sqft about 850 plus stairs. 
 
Thanks Phil

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Beau Trimble
Set in Stone Restoration &
Desert Stone and Saltillo