Funds deposited in the housing trust fund may be used for any activity approved by COAH to address the municipal fair share. Such activities include, but are not limited to, rehabilitation, new construction, RCAs subject to the provisions of N.J.A.C. 5:94-4.4(d), ECHO housing, purchase of land for affordable housing, improvement of land to be used for affordable housing, purchase of housing, extensions or improvements of roads and infrastructure to affordable housing sites, financial assistance designed to increase affordability, or administration necessary for implementation of the housing element and fair share plan. The expenditure of all funds shall conform to a spending plan approved by COAH.