Industry News

Thiobencarb Monitoring Moves to Fifth and Sixth Weeks

Thiobencarb monitoring results report numbers at most sites on May 30 and June 4. The monitoring numbers exceeded the 1.5 µg/L (parts per billion) performance goal at the upper part of Colusa Basin Drain (CBD5) on May 30, and the lower part of the drainage (CBD1) May 30 and June 4. This now counts as seven exceedances of the performance goal into the sixth week of monitoring.

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Thiobencarb Fourth Week of Monitoring

Memorial Day weekend typically marks the fifth week of thiobencarb monitoring with peak use and numbers exceeding the 1.5 µg/L (parts per million) performance goal. For this atypical year, the holiday marked the fourth week of monitoring with numbers at all sites except the Sacramento River location. The monitoring results recovered to acceptable levels after a rough start where the performance goal was exceeded two and three weeks into the program.

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Thiobencarb Results Continue to Exceed at Third Monitoring Event

Thiobencarb Results Continue to Exceed at Third Monitoring Event

Thiobencarb exceedances over the 1.5 µg/L (parts per million) performance goal with a reading of 2.3 µg/L at the Colusa Basin Drain 5 (CBD5) site off Highway 20 and 2.7 µg/L at the Colusa Basin Drain 1 (CBD1) location outside Knights Landing. There also was a detectable reading at the Sacramento Slough site. These exceedances were from the third monitoring event on May 21.

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Pyrethroid TMDL for 303(d) listed water bodies

Pyrethroid TMDL for 303(d) listed water bodies

Pyrethroid insecticides have been under scrutiny for several years resulting in recent changes to water quality requirements. The changes set monitoring levels for pyrethroids at nanograms in surface waters. Consistent exceedances of the levels could result in additional restrictions to pyrethroid use, or designate a drain as impaired with future restoration to correct the water quality. Last year, one of the water quality coalitions had a detection that could be problematic under the new standards.

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