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Soil Investigations for Data Collection in the Delta Initial Study/Proposed Mitigated Negative Declaration 27 the form of Open Space Subvention payments. Counties may not report updated Williamson Act enrollment figures because they lack planning staff to administer the Williamson Act program. Therefore, this analysis reflects the most recent available Williamson Act enrollment data reported by the counties. Approximately 16 million acres has been consistently enrolled under the Williamson Act statewide since the early 1980s (DOC 2016b). This represents almost half of California’s farmland and nearly one-third of its privately-owned land. Approximately 33% of the proposed on-land soil investigation sites are located on mapped Williamson Act Land (DOC 2019b). 3.2.1.3 Forest Land Forest land is defined as native tree cover greater than 10% that allows for management of timber, aesthetics, fish and wildlife, recreation, and other public benefits (California Public Resources Code (PRC) Section 12220(g)). Natural forest and woodland vegetation types in the Study Area typically have greater than 10% cover generally characterized as Valley Foothill riparian with the regional dominant tree types being willow or riparian mixed hardwood. Approximately 1% of the proposed on-land Impact Areas are mapped as forest land on the Fire Return Interval Departure map and are made up of deciduous orchard and Valley oak woodland (Safford et al 2013). Timberland, a subset of forest land, is defined by State law as land that is available for, and capable of, growing a crop of trees of any commercial species used to produce lumber and other forest products (PRC Section 4526), and can produce an average annual volume of wood fiber of at least 20 cubic feet per acre per year at its maximum production (PRC Section 51104(g)).The Study Area does not contain areas zoned for timber production. 3.2.2 Discussion a) Would the project convert Prime Farmland, Unique Farmland, or Farmland of Statewide Importance (Farmland), as shown on the maps prepared pursuant to the Farmland Mapping and Monitoring Program of the California Resources Agency, to non-agricultural use? No Impact. While some of the Study Area overlaps areas mapped as farmland, the Proposed Project activities would not convert prime farmland, unique farmland, or farmland of Statewide importance. On-land Impact Areas are primarily located on roads and road right of ways, and Impact Areas within agricultural fields would be temporary and would not require a conversion of land use. The Proposed Project would not convert prime or unique farmland or farmland of Statewide importance. While there would be no impact to Prime Farmland, Unique Farmland, or Farmland of Statewide Importance convergence, implementation of Mitigation Measure MM AGR-1 would further avoid, minimize and/or reduce the potential for impacts.