Then usable tread depth is compared to remaining tread depth in order to calculate tread wear percentages. For example, a tire that started with 10/32 of original tread depth and has worn off 4/32 (down to 6/32 of remaining tread depth) is 50% worn.
1 If you know the census tract number: Use the IRS list of 2014 Qualified Census Tracts by county. 2  If you have a street address: Visit HUD's interactive QCT Map and enter the property address to view what Census Tract the property is located.
A Census tract is a division of a county, much like a zip code. Tracts tend to have between 2,500 and 8,000 people. It's fairly easy to identify which county or city a project is in, but it can be more frustrating to identify the Census tracts that are in a project area.