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CONDITION V — RICE PESTICIDES — SAN JOAQUIN COUNTY General Water -Holding The following seepage control requirements apply to all rice pesticides having mandatory water - holding requirements such as thiobencarb, etc. Non-compliance with seepage requirements is considered a water -holding violation. A. Rice pesticides, such as thiobencarb, shall not be applied to rice fields exhibiting visible water seepage that moves offsite into drains that are considered state waters. B. Borders surrounding each rice field shall be compacted before water is allowed to fill the field; the degree of compaction shall be sufficient to prevent water from seeping through the border. For example, compaction may be achieved by driving the tires or tracks of a tractor, or other heavy vehicle, on one side of the border. C. This requirement applies to new or reworked existing borders for the current rice season. D. A common border between two existing rice fields does not need to be compacted. THIOBENCAR.B Water Management Rice fields treated with thiobencarb in the Sacramento/San Joaquin Valley (south of the line defined by Roads E10 and 116 in Yolo County and the American River in Sacramento County), except those treated with Abolish® 8EC: A. Except as listed below, all water on treated fields must be retained on the treated fields for at least 19 days following application. When drainage begins, water discharge must not exceed two inches of water over a drain box weir for an additional seven days. Unregulated discharges from these fields may begin after 26 days. 1. When water is contained within a tailwater recovery system, ponded on fallow land, or contained in other systems appropriate for preventing discharge, the system may discharge 19 days following the last application of thiobencarb within the system unless: (a) The system is under the control of one permittee, then water may be discharged from the application site in a manner consistent with product labeling (14 -day water -hold period). (b) The system includes drainage from more than one permittee, then water must be retained on the site of application for six days before discharged from the application site into the system. (c) Water is on fields within the bounds of areas that discharge negligible amounts of rice field drainage into perennial streams until fields are drained for harvest. Water -hold may be reduced to six days, if the commissioner evaluates such sites and verifies the hydrologic isolation of the fields.