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C FAMILY — SLOPE/DRAINSNEGETATION <br /> Nonlandscaped Chemical Vegetation Control <br /> Environmental Concerns <br /> Discharge of the following materials into the storm <br /> water drainage system or watercourse: <br /> • Fuel • Sediment <br /> • Non-storm water • Vehicle fluids <br /> • Pesticides <br /> Minimize the use of herbicides. <br /> Protect drain inlets and watercourses. <br /> DEFINITION AND This method of vegetation control uses pesticides (e.g., herbicides, pre- <br /> PURPOSE emergents) to eliminate and prevent the growth of undesirable vegetation <br /> within the highway right-of-way. Chemical vegetation controls are used to <br /> protect preferred vegetation, to provide fire protection and to improve <br /> roadside appearance. The activity includes the operation of support <br /> equipment, mixing and loading chemicals and chemical application to <br /> native vegetation. <br /> APPROPRIATE The following procedures are used to prevent releases of pesticides, <br /> APPLICATION sediment and equipment fluids to storm water drainage system and <br /> watercourses. . <br /> LIMITATIONS Vegetation management can result in reduced erosion control effectiveness. <br /> BMP implementation will depend on traffic, weather, available resources <br /> and safety conditions. <br /> OPERATIONAL • This activity shall not be performed during rain events or prior to <br /> PROCEDURES predicted rain events that produce runoff unless required by emergency <br /> conditions. <br /> • A licensed Agricultural Pest Control Adviser (PCA) should approve the <br /> activities. <br /> • Identify drain inlets and watercourses, both upstream and downstream <br /> of the activity site. Protect the drain inlets, storm water drainage <br /> system and watercourses from discharges of potential pollutants. <br /> • Mixing and loading into spray equipment should be in a containment <br /> area away from drain inlets and watercourses. <br /> • Apply pesticides in compliance with federal, state and local pesticide <br /> use regulations as recommended by the District Annual Vegetation <br /> Control Plan. Apply pesticides only as specified on the "Pesticide Use <br /> Recommendation" on the label and as approved by the PCA. <br /> Caltrans Storm Water Qua]ity IFIandbook B-21 <br /> Maintenance Staff Guide <br /> May 2003 <br />