Water Quality

Thiobencarb Update with Exceedance Report

Monitoring results were at the performance goal of 1.5 µg/L on May 12 and May 28. The detections were noted at the Colusa Basin Drain 5 and Butte Slough 1 sites. On June 2, the duplicate sample for quality control had an exceedance of 1.8 µg/L while the standard lab result was at 1.2 µg/L. The samples were from the Colusa Basin Drain 1 site outside Knight’s Landing. All sampling results recovered to non-detection levels on June 4.  

These are impressive monitoring results, considering the recent weather challenges throughout the Sacramento Valley. 

Note: Thiobencarb water quality monitoring results are measured in micrograms per liter (µg/L), which are expressed as  parts per billion.

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More Positive Results from Thiobencarb Monitoring

Good news continues as the thiobencarb monitoring results hit a peak detection of 1.2 ppb on May 20 at the CBD5 site, which is below the performance goal of 1.5 ppb. Monitoring results at the CBD5 site recovered to 0.79 ppb and 0.73 ppb on May 25 and 27. Sight detections were discovered at the lower Colusa Basin site (CBD1) and Butte Sough. We are halfway through the monitoring season and will continue share monitoring results throughout the season.  

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Propanil Update for 2021

Propanil Update for 2021

The CRC received calls about concerns with the propanil SuperWHAM!® CA performance last year. We reached out to UPL, the registrant, and the company completed considerable research over the winter months. 

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