; and (B) other appropriate scientific resources, as determined by the Secretary; (2) using tree species that are native to the region and at ecologically appropriate densities; and (3) in a manner that does not create other negative impacts to biodiversity or the environment. (e) Guarantee amount With respect to bonds, loans, and other investment vehicles guaranteed under the program, the Secretary shall guarantee not more than $150,000,000 in the aggregate. (f) Implementation (1) Appraisals The Secretary may require an appraisal of an eligible entity requesting a guarantee under the program, including to assess the creditworthiness of the eligible entity, by a specialized appraiser that uses standards that are similar to standards used for similar purposes in the private sector, as determined by the Secretary. (2) Financial information The Secretary may require financial information from an eligible entity requesting a guarantee under the program in the same manner as is generally required by commercial lenders. (g) Auditing Not less frequently than annually, the Secretary shall conduct audits of each eligible project financed under the program to ensure that the methodology used with respect to the project continues to comply with the standards determined by the Secretary under subparagraphs (A) and (B) of subsection (c)(1). (h) Regulations Not later than 180 days after the date of enactment of this Act, the Secretary shall issue regulations to implement the program. (i) Termination of authority The authority to guarantee a new bond, loan, or other investment vehicle under this section terminates on September 30, 2028.