; and (B) in which the animals spend all or a substantial portion of their time grazing on fields in which some or all of the manure is deposited and left in the field and decomposes aerobically. (5) Solid separation system The term solid separation system means a system designed to separate liquid components of manure from mineral and organic solid components of that manure. (b) Establishment The Secretary shall establish an alternative manure management program to award contracts to eligible producers to support carbon sequestration and greenhouse gas emissions reductions by implementing covered management measures. (c) Submission of contract offers To be eligible to participate in the alternative manure management program, an eligible producer shall submit to the Secretary a contract offer that details any management measure to be used on the operation of the eligible producer. (d) Cluster contract offers The Secretary shall establish procedures under which— (1) groups of eligible producers may submit a joint contract offer for a shared composting facility; and (2) the Secretary shall allocate payments to each eligible producer associated with a joint contract described in paragraph (1). (e) Duties of the Secretary (1) Evaluation criteria The Secretary shall develop criteria for evaluating applications that will maximize— (A) carbon sequestration; (B) greenhouse gas emissions reductions