San Joaquin County & Delta Water Quality Coalition
 

2007 Storm and Irrigation Season Exceedances Summary

Below is a list of watersheds and those pesticides that were found in the waterways above allowable levels.  These samples taken by your Coalition helps us determine areas that agriculture needs to improve by preventing pesticide runoff into the waterways.  Please see if you are within the watershed area, and take note of any management practices that you could implement to prevent these water quality issues.  It is important that agriculture and the Coalition shows improvement in water quality to prevent further regulations and enforcement actions by the Regional Water Quality Control Board. 

 East of Highway 99

 Duck Creek

Chlorpyrifos (Lorsban), Diazinon

French Camp Slough

Chlorpyrifos (Lorsban), Diazinon, Copper, Dieldrin, Methidathion (Supercide),

Thiobencarb (Bolero)

 Mormon Slough

Chlorpyrifos (Lorsban)

Littlejohns Creek

Chlorpyrifos (Lorsban), Diazinon, Copper

Lone Tree Creek near Jack Tone Road

Chlorpyrifos (Lorsban), Diazinon, Copper, Simazine, Thiobencarb (Bolero)

Drain to Lone Tree Creek (area between Lone Tree Creek and Littlejohns creek on the east side of Jack Tone Road)

Chlorpyrifos (Lorsban), Diuron, Methidathion (Supercide), Simazine

Mokelumne River

Copper 

West of Highway 99

Grant Line Canal @ Clifton Court Road

Chlorpyrifos (Lorsban), Carbofuron (Furadan), Copper

Grant Line Canal Near Calpack Road

Disulfoton (Disyton)

Roberts Island Drain along House Road

Cypermethrin (Ammo, Cynoff, Demon, Cymbush)

Terminous Tract Drain

Malathion

Common Sense Management Practices to prevent pesticides from entering into the waterways:

1. Do not spray over waterways, open drains or irrigation ditches
2. Make sure all workers are trained in proper use of the equipment, i.e. turning off the spray rig when making turns at the end of the field
3. Prevent drift, do not spray in windy conditions
4. Do not irrigate immediately after applications or do not apply material before rain events.  Many materials take several weeks or even a month to break down.
5. Prevent sediment from running into water ways by holding the water on your farm or by using return systems or cover and buffer vegetation.

Specific Management practices for specific materials

1.  Chlorpyrofos (Lorsban)- This material is very soluble in water therefore moves readily off the field.  Field test has detected this product in run off from a field for up to 30 day later. 

a.  After applying wait at least a week before irrigating or longer if possible.

b.  Use a return system to prevent water from leaving your property.

c.  Do not drain runoff irrigation water directly into waterways.

d.  Plant cover crops to hold sediment and water on the field during storm events 

2.  Diazinon – The use of cover crops and vegetative buffers has proven to reduce the run off of dominant sprayed Diazinon. 

If you have any questions please contact the San Joaquin County and Delta Water Quality Coalition at info@sjdeltawatershed.org, or call at 209-472-7127 ext 125.

Are you a Member?

Anyone who signed up prior to the Regional Water Quality Control Board's December 31,2006 deadline is a member of the Coalition.  However, if you have bought new property you must apply through the Regional Board to join the coalition.  It does not matter if you or the property were part of the coalition before, according to the Regional Board, you must go through the reapplication process when property changes ownership. The application to become a member of the coalition can be found on the Regional Board's website. 

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Send mail to info@sjdeltawatershed.org with questions or comments about this web site.
Copyright © 2007 San Joaquin County & Delta Water Quality Coalition
Last modified: 12/10/07