Let me start off by saying I've been meaning to go to the NCMA class for a couple years now. My boss is certified but forgot the answer to this question. When backfilling a SRW what do you use, 3/4 crushed or 3/4 (clean) crushed washed ? I ordered washed for our stock for use as backfill, thinking that not having the fines present was the whole idea behind using stone and fabric when backfilling. Anyone know for sure?