TurnoverBased on the Regulation as of September 7, 2012

Turnover is defined as:

Note that replacing a lower tier piece of equipment with high tier piece of equipment is technically not considered Turnover. The elimination of the lower tier equipment is considered retirement so credit is given for that action. The addition of the new(er) equipment is governed by another provision "Adding Vehicles."

The "Adding Vehicles" provision says a fleet can add a piece of equipment as follows:

There are a number of exemptions from Turnover. For details click on the "Turnover Exemptions" box in the compliance chart.