The assessment must account for potential cost savings on water supply, disposal, and expected maintenance. The economic assessment should, at minimum, determine the simple payback of any new fixture investment. Carefully consider the payback period required to justify your purchasing decision.
Develop and implement a policy requiring an economic assessment of a conversion to high-performance plumbing fixtures and fittings as part of any future indoor plumbing renovation.
If more than 10% of the building floor area is occupied by tenants who are unwilling or unable to share information about currently installed lamps, the project team is allowed to extrapolate existing data for the purchasing plan in order to complete a plan that covers at least 90% of the lamps in the building and associated grounds.
If you need to exclude 10% of the floor area in a multi-tenant building from your initial lamp inventory, you are still only required to cover 90% of the total number of inventoried lamps in your
Work with building tenants to obtain actual lamp data for each of their spaces. The project team may exempt up to 10% of the building floor area if the tenants that use that space are not willing or able to share information about currently installed lamps.
Reducing the wattage of a lamp (for instance, going from a 32-watt T-8 fluorescent tube to a 28-watt T-8) will typically result in mercury reductions as well as improved energy efficiency. If it is economically feasible to retrofit a portion or all of the lamps and ballasts, those changes may make this credit more achievable.
