With a few final tweaks that were sympathetic to agriculture, the Board of Supervisors on Tuesday unanimously approved two out of seven amendments that together replace the 1980 Local Coastal Program. The action sets the county on track to tackle the final portion of the update, which pertains to environmental hazards, though the new ground rules for development in Marin’s coastal zone will not go into effect until the entire update is finalized. The amendments under consideration Tuesday, technically numbered three and seven, have given the county special trouble within the more than decade-long negotiation process with the California Coastal Commission. This spring, when the board approved three amendments, it withheld the two for further work, responding to public concern over issues related to agricultural definitions, changes in village zoning and building restrictions. But it seems a preliminary consensus may have finally been reached, at least between the two agencies. The coastal commission has indicated support for the language, which won unanimous support from the Planning Commission in October. County staff since made minor alterations, sprucing up the language before it went to the board. On Tuesday, however, the board acted to make further last-minute changes, in part in to address the agricultural community, some of whose representatives voiced 11th-hour grievances. (More testimony was heard last week, when Supervisor Dennis Rodoni proposed giving the public one more week to present comments.) Most significantly, the board’s final changes include adding a special mention of carbon sequestration practices as one of the elements of ongoing agriculture that does not need a coastal development permit. Another was to clarify that the requirement for a permit in the case of “installation or extension of irrigation systems” is not intended for cases when a farmer moves water from an existing source to a water trough or otherwise moves it around, as is typical practice for rotational grazing and wells. “Thought I saw a couple of nods back there,” said board chair Damon Connolly, looking out at the audience. The board gave the staff the authority to make the changes without again bringing the language before them. Jack Liebster, the county’s longtime L.C.P. expert, said he hopes the commission will certify the two amendments at a local hearing in early 2019.