Greenfield GSA flags coordination and contamination concerns after well drilled near Thorne Road

The Greenfield City Groundwater Sustainability Agency on Monday received a status report about a recently drilled well near Thorne Road that agency staff say was sited without adequate coordination and may not provide the groundwater data the agency needs.

Curtis, the agency’s general manager, told the board that the drill rig was set up at the road shoulder ‘‘right at the entrance to the old dump’’ and that the location is ‘‘hundreds of feet’’ above the river channel, raising questions about whether the boreholes will penetrate river alluvium or instead encounter clay. He said the site may be ‘‘very close to, if not right on top of, the old landfill’’ and that those conditions could affect water quality and the usefulness of the data.

Why it matters: Greenfield’s GSA is working to define groundwater‑dependent ecosystems and to establish monitoring that will detect impacts from groundwater use. Wells sited far from the channel or over landfill deposits may not reflect aquifer conditions important for those environmental assessments.

What happened: Curtis said he contacted the Salinas Valley Basin GSA (the transcript also refers to a similarly named entity, ‘‘Salisbury Basin GSA’’) about the drilling and that the other agency ‘‘did commit sending me the well logs when they’re complete.’’ He said he will forward those logs to a staff member, Gus, and asked Gus to review them and prepare a summary for the board. ‘‘That will help us,’’ Curtis said, and he estimated the review and a board summary would take ‘‘probably a month or so.’’

Board members pressed for better interagency communication. One member noted the drill was ‘‘right next to the road’’ and said there were ‘‘better spots’’ where the well could have been sited. Curtis urged improved coordination, describing this episode as ‘‘one that could have been avoided’’ and saying it was appropriate for the GSA to ‘‘go on record’’ about the concerns.

No formal action: The board did not take a formal vote or direct staff to pursue enforcement or mitigation at the meeting. The only formal action earlier in the agenda was adoption of minutes from July 22. The general manager’s stated next steps are to obtain and review the well logs, have staff analyze them, and bring findings back to the board.

What remains unresolved: The transcript records concerns about proximity to an old landfill and the potential for clay at the site, but it does not include technical results, a completed log, or confirmation of contamination. The other GSA’s identity and the precise landownership or permitting circumstances are not specified in the record.

The board adjourned after noting the general manager’s report was on file.