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The formulas and tables on this page are intended to assist
the inspector in determining the approximate number of tires at a site. Numbers
of whole tires are calculated by volume (in cubic yards). Numbers of altered
tires (in passenger tire equivalents) can be calculated by volume or by weight.
Before determining the number of waste tires, make sure you understand the
definitions of waste and other tires. For
inspection purposes, only waste tires are counted toward total number of tires
allowed.
Use the following formula based on the length, width, height in feet
(obtained by measuring or estimating tire pile size) and convert to cubic yards of
tires:
[Length (feet) x Width (feet) x Height (feet)] ÷ 27 = Volume (in cubic
yards)
Once you have determined the cubic yards of a tire pile, multiply
cubic yards by the tires per cubic yard (tires/cy) as listed in the
conversion tables below for whole or altered tires.
Whole Passenger/Light Truck Tires
| Storage Type |
Height of Tire Pile |
|
(Stored less than 15 years) |
(<10 feet) |
(10-15 feet) |
(>15 feet) |
| Loose |
10 tires/cy |
12 tires/cy |
14 tires/cy |
| Barrel |
12 tires/cy |
14 tires/cy |
16 tires/cy |
| Laced |
14 tires/cy |
16 tires/cy |
18 tires/cy |
| (Stored 15 years or more) |
| Loose |
12 tires/cy |
14 tires/cy |
16 tires/cy |
| Barrel |
14 tires/cy |
16 tires/cy |
18 tires/cy |
| Laced |
16 tires/cy |
18 tires/cy |
20 tires/cy |
Whole Semi-Truck Tires
| Storage Type |
Height of Tire Pile |
|
(Stored less than 15 years) |
(<10 feet) |
(10-15 feet) |
(>15 feet) |
| Loose |
2.5 tires/cy |
2.75 tires/cy |
3.0 tires/cy |
| Barrel |
4.2 tires/cy |
4.4 tires/cy |
4.6 tires/cy |
| Laced |
4.1 tires/cy |
4.3 tires/cy |
4.5 tires/cy |
| (Stored 15 years or more) |
| Loose |
3.0 tires/cy |
3.5 tires/cy |
4.0 tires/cy |
| Barrel |
4.4 tires/cy |
4.6 tires/cy |
4.8 tires/cy |
| Laced |
4.3 tires/cy |
4.5 tires/cy |
4.7 tires/cy |
| Type |
Tires/CY |
Description |
| Sidewalls or treads |
20 tires/cy |
The photo below shows cut out sidewalls and treads. |
| Primary shreds |
20 tires/cy |
Tires that have been run through a shredder one time. |
| Shreds 2 inches or smaller |
40 tires/cy |
Tires that have been run through a shredder more than once to
create pieces two inches or smaller. |
| Crumb rubber (less than ¼ inch in size) |
NA |
Not regulated by the California Integrated Waste Management
Board. |
If you know the weight of altered tires, you can
convert directly to a number of passenger tire equivalents (PTE).
The California Code of Regulations, 14 CCR Section
17225.770 defines a "passenger tire equivalent" (PTE) as the total weight of
altered waste tires, in pounds, divided by 20 pounds. 1 PTE = 1 Waste Tire.
If weight is known:
Total Known Weight (pounds) ÷ 20 pounds = PTE
Note: This information is also found on the back
of the Comments Form (CIWMB 183).
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