Industry News

Final Thiobencarb Monitoring Results and Summary

Final Thiobencarb Monitoring Results and Summary

The CRC concluded thiobencarb monitoring on July 16. The city monitoring results are pending and should be non-detect based on the CRC results at the river site (SR1). 

Overall, it was a challenging year considering the late, wet weather and abundance of water in the system. We placed the industry on high alert because exceedances occurred two weeks into the season. Fortunately, the exceedances were in recovery mode during the following monitoring events. 

We had concerns because there were detections over the reporting limit in the minor drains at the Butte and Sacramento Slough sites. Monitoring results are typically higher at the Colusa Basin Drain, since it is a conveyance carrying more drainage than the Butte or Sacramento Sloughs. The city results had trace amounts at the drinking water intakes, which we amplified in our e-communications. 

To summarize, there were eight exceedances of the performance goal of 1.5 µg/L. The exceedances ranged from 1.7 µg/L to 2.7 µg/L. The performance goal is an indicator in the agricultural drains. Maintaining a 1.5 µg/L performance goal assists the cities in compliance with the secondary maximum contaminant level (MCL) of 1.0 µg/L. The primary MCL for thiobencarb is 42 µg/L. Primary MCLs are regulatory standards in place for toxicity and the secondary MCL is for nuisance (taste and odor). The thiobencarb monitoring has never been a toxicity issue, however the cities have to provide safe, reliable drinking water free of taste and odor.

More Industry News Stories

Lambda-cyhalothrin to be extensively monitored in Rice this year

Lambda-cyhalothrin to be extensively monitored in Rice this year

We start monitoring Lambda-cyhalothrin (Warrior, Lambda-cy, Silencer, etc.) in the water column plus sediment sampling this year. The sampling takes place at the drain sites we use for thiobencarb monitoring. This will be our first experience with compliance to the Total Maximum Daily Load (TMDL) requirements. The TMDL is a forever monitoring program and we anticipate positive results leading to future modifications. We have never had an issue with our long history monitoring the pyrethroid insecticides. However, we have no ability to correlate the past results with the newer and much lower analytical methods.

READ MORE
Here are Key Links and Updates for Rice Pesticides

Here are Key Links and Updates for Rice Pesticides

The following links include select pesticide updates as an effort to provide you with easy access to the information. Please remember the pesticide label is the ultimate level of enforcement and the county permit conditions can supersede the label with more restrictive requirements. You will find permit conditions and supplemental labels for thiobencarb. Permit conditions for some pesticides have been changed to active ingredient rather than trade or product name due to new product registrations. Products such as Butte Herbicide, RebelEx CA and RiceEdge 60DF are combination formulations and permit conditions could apply to one of the active ingredients. The EPA Reg. No. provides additional identification of the individual pesticide products on the Rice Pesticide Update Table.

READ MORE