Tier 1 Wastewater Facilities
These include secondary or advanced wastewater treatment facilities and the major components of wastewater conveyance systems, such as large pumping stations/force mains and interceptor sewers.
Tier 2 Wastewater Facilities
These projects are similar in nature to the Tier 1 projects but would generally have difficulty in obtaining funding in competition with Tier 1 projects due to lower priority points (for example, smaller communities or CSO correction projects), or that may otherwise be ineligible for funding (such as upgrades or additions at facilities that previously received funding.) The priority rating system is adjusted for this category, whereby, for example, a lower population can give higher points, or the number of points assigned for a CSO project is higher than in the Tier 1 rating system. (Any Tier 1 project would also satisfy the definition of a Tier 2 project.)
These include the planning and design as well as the construction of projects to correct problems of stormwater and groundwater entering sewers as a result of leaks or improper connections. Excessive I/I can, of course, result in surcharging and overflows within the collection system and over the treatment plant, or result in the need for much larger and costlier facilities to deal with peak wet weather flows. In fact, one of the prerequisites for obtaining approval of a Tier 1 or Tier 2 project is the applicant's demonstration that the proposed treatment works will not be subject to excessive I/I.
These are the smaller diameter sewers in local streets that collect wastewater from homes and businesses. The ranking system for this category favors those projects that are associated with a Tier 1 or Tier 2 project, where there are substantial numbers of failing septic systems, higher population densities, and unsuitable soil conditions for on-site disposal. The program is aimed at correcting existing problems, not simply expanding sewerage systems. Seventy-five percent of the total projected flow in the area of a collection system project must have already been in existence as of July 1, 1995.
Tier 1 Planning & Design
This category encompasses facilities planning and the preparation of plans and specifications for Tier 1 wastewater projects.
These projects implement or are consistent with the Nonpoint Source Management Plan, developed and updated by the Department pursuant to Section 319 of the Clean Water Act. They may include but are not limited to, the repair and/or upgrading of on-site subsurface sewage disposal systems, landfill capping and closure, remediation of leaking underground storage tanks, erosion control, and control of stormwater runoff.