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17 <br />7.0 EVALUATION OF BMP EFFECTIVENESS <br /> <br />Ongoing evaluation is necessary to measure effectiveness of the BMPs employed to reduce <br />or eliminate the application of aquatic pesticides and minimize the areal extent and duration <br />of impacts caused by their application. <br /> <br />7.1 PESTICIDE RESIDUALS MONITORING <br /> <br />The evaluation of BMPs for optimal pesticide application will be derived from the pre- and <br />post-application water quality analyses. The finding of pesticide residuals within the treatment <br />area or outside of the target treatment area after a defined period of time will call for <br />modification of pesticide application BMPs. <br /> <br />7.2 ANNUAL PESTICIDE USAGE <br /> <br />The objective of ongoing refinement of BMPs is to increase effectiveness of aquatic <br />pesticide applications and reduce usage over time. Total annual usage of each pesticide used <br />will be compared on a year over year basis to document trends in aquatic pesticide use over <br />time. Due to environmental variables, other data such as tonnage of biomass material <br />harvested, water temperatures and weather conditions should be included in the evaluation. <br /> <br />7.3 LESS TOXIC ALTERNATIVES AND MITIGATING MEASURES <br /> <br />Physical, cultural, biological, and less toxic chemical control alternatives will be investigated <br />on an ongoing basis and effectiveness evaluated. <br />6.3.A. - Page 182