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APPENDDIC Maintenance Staff Guide <br /> • Calibrate the spray rig to ensure accurate application of herbicides. <br /> • Avoid using overhead irrigation for as long as the chemical manufacturer <br /> recommends after applying post emergent herbicides. <br /> • Unless allowed by the label directions, do not spray chemicals when rainfall causing <br /> runoff is forecasted. <br /> • Herbicide use should be documented and summarized in the Annual Report. <br /> Caltrans Storm Water Quality Handbook C-173 <br /> Maintenance Staff Guide <br /> May 2003,revised Sep 2012 <br />