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Portlands vs Blended Hydraulics

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Title: Portlands vs Blended Hydraulics

the more i look into it, the more questions i have . . .
bottom line question is:

What are the pros and cons of specifying one versus the other, or should i be allowing either ?
Costs, quality, permeability, etc

any takers?
harold?

robert d. rollo, PE
Corporate Associate
Parkhill, Smith & Cooper, Inc.
Lubbock, Texas
rrollo(--nospam--at)team-psc.com
rdrollo(--nospam--at)aol.com
(806) 761-7539vox
(806) 747-7146 fax