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Thiobencarb, Continued <br />Water Management <br />1. The following water holding requirements apply to rice fields treated with thiobencarb in the <br />Sacramento Valley (north of the line defined by Roads E10 and 116 in Yolo County and the <br />American River in Sacramento County), except those treated with Abolish® SEC: <br />A. Except as listed below, all water on treated fields must be retained on the treated fields <br />for at least 30 days following application. When drainage begins, discharge must not <br />exceed two inches of water over a drain box weir for seven additional days. Unregulated <br />discharges from these fields may then begin after 37 days. <br />1. When water is contained within a tailwater recovery system, ponded on fallow land, <br />or contained in other systems appropriate for preventing discharge, the water must be <br />retained in the system for 19 days, unless: <br />(a) The system is under the control of one permittee, then water may be discharged <br />from the application site in a manner consistent with product labeling (14 -day <br />water hold). <br />(b) The system includes drainage from more than one permittee, then water must be <br />retained on the site of application for six days before being discharged from the <br />application site into the system. <br />(c) Water is on fields within the bounds of areas that discharge negligible amounts of <br />rice field drainage into perennial streams until fields are drained for hat vest. <br />Water -hold may be reduced to six days if the commissioner evaluates such sites <br />and verifies the hydrologic isolation of the fields. <br />11. Rice fields treated with thiobencarb in the Sacramento/San Joaquin Valley (south of the line <br />defined by Roads E10 and 116 in Yolo County and the American River in Sacramento <br />County), except those treated with Abolish® 8EC: <br />A. Except as listed below, all water on treated fields must be retained on the treated fields <br />for at least 19 days following application. When drainage begins, water discharge must <br />not exceed two inches of water over a drain box weir for an additional seven days. <br />Unregulated discharges from these fields may begin after 26 days. <br />D-18 <br />(Rev. 12-14) <br />Continued on next page <br />