covered by the financial assurance, and has commenced revegetation on the regraded areas subject to mineral activities in accordance with the approved plan, that portion of the total financial assurance secured for the area subject to mineral activities attributable to the completed activities may be released except that sufficient assurance must be retained to address other required reclamation and restoration needs and to assure the long-term success of the revegetation. (2) After the operator has completed successfully all remaining mineral activities and reclamation activities and all requirements of the operations plan and the reclamation plan, and all other requirements of this Act have been fully met, the remaining portion of the financial assurance may be released. During the period following release of the financial assurance as specified in paragraph (1), until the remaining portion of the financial assurance is released as provided in paragraph (2), the operator shall be required to comply with the permit issued under this title. (g) Effluent Notwithstanding section 207(b)(4), where any discharge or other water-related condition resulting from the mineral activities requires treatment in order to meet the applicable effluent limitations and water quality standards, the financial assurance shall include the estimated cost of maintaining such treatment for the projected period that will be needed after the cessation of mineral activities. The portion of the financial assurance attributable to such estimated cost of treatment shall not be released until the discharge has ceased for a period of 5 years, as determined by ongoing monitoring and testing, or, if the discharge continues, until the operator has met all applicable effluent limitations and water quality standards for 5 full years without treatment. (h) Environmental hazards If the Secretary concerned determines, after final release of financial assurance, that an environmental hazard resulting from the mineral activities exists, or the terms and