and propagation of a balanced, indigenous population of shellfish, fish, and wildlife Actions that, in order to allow for recreational activities in and on water, require the control of point and nonpoint sources of pollution to supplement existing controls of pollution. In many cases, estuary level protection plans are combined with other elements of an overall project. Where the water quality portion of a project is clearly distinct from other portions of the project, only the water quality portion can be funded by the CWSRF. Eligible use of funds The CWSRF employs a variety of loan assistance mechanisms. Loans Terms may not exceed 20 years. Interest rates must be at or below market rate including interest-free. Purchase of debt or refinance A community's debt may be purchased by an SRF program. Under the Extended Term Finance Policy, the purchase may have terms greater than 20 years, up to the useful life of the project. Targeted to disadvantaged communities, though a waiver of the restriction may be granted. An SRF program may refinance previously issued debt. Guarantees and insurances Guarantees or insurance can be used where such assistance will result in improved credit market access or reduced interest rates. The SRF program does not disburse funds for construction; such funds are procured by a borrower in the market. Guarantee SRF revenue debt Section 603(d)(3) of the Act authorizes CWSRF's to guaranty debt. Guaranty powers increase the funding capacity of CWSRF's as well as decrease annual payments which utility ratepayers must pay for their wastewater projects. Guaranties work very much like municipal bond insurance. SRF programs may issue debt guaranteed by SRF funds. The revenue generated is used to provide assistance to borrowers for eligible projects. This greatly expands the capacity of a program in the near-term. Provide loan guarantees Similar revolving funds established by municipalities or inter-municipal agencies can receive loan guarantees. Additional Subsidization Under certain conditions, CWSRF programs may provide up to a fixed percentage of their capitalization grants as additional subsidization in the form of principal forgiveness, negative interest rate loans, or grants. The recipient must be a municipality or inter-municipal, interstate, or state agency. Additional subsidization may only be used to help address affordability issues or to implement a process, material, technique, or technology that addresses water or energy efficiency goals; mitigates stormwater runoff; or encourages sustainable project planning, design, and construction. Earn Interest CWSRFs may invest available