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County utility reports about 99% drop in hydrogen sulfide at Wood Hill after week of chemical feed
Summary
Utility staff told commissioners a downstream monitor showed hydrogen sulfide levels fall from roughly 200–300 ppm to about 10–20 ppm within about a week of starting a chemical feed; staff said the chemicals are part of the treatment process and will be evaluated for permanent application.
Utility staff reported a rapid, substantial reduction in hydrogen sulfide at the Wood Hill area after beginning a chemical feed about a week earlier.
A utility representative said a downstream manhole monitor measured hydrogen sulfide levels "from about 2 or 300 parts per million to about 10 or 20," a change the chair characterized as "a 99% reduction." The representative added the chemicals are "part of the treatment process" and that staff will spend the next week "dialing that in" and then make recommendations regarding any permanent application.
Commissioners asked about evidence and safety; staff responded that readings from the monitor indicate the chemical application has been effective and that the chemicals are safely managed within the plant treatment process.
The report in the meeting was an operational update; no formal policy action or vote on permanent adoption of the treatment process was taken at this meeting. Staff indicated further recommendations—based on monitoring and calibration—will be brought to the board if permanent application is proposed.
