Laserfiche WebLink
City of Redwood City, Public Works Division Initial Study & Mitigated Negative Declaration <br />Document Date: October 15, 2015 <br />Revision Date: January 25, 2016 Page 41 Blankinship & Associates, Inc. <br /> <br /> <br /> <br />h) Place within a 100-year flood hazard <br />area structures which would impede or <br />redirect flood flows? <br /> <br /> <br />i) Expose people or structures to a <br />significant risk of loss, injury or death <br />involving flooding, including flooding as a <br />result of the failure of a levee or dam? <br /> <br /> <br />j) Inundation by seiche, tsunami, or <br />mudflow? <br /> <br />Discussion <br /> <br />The City implements an IPM program for algae and aquatic weed control pursuant to the <br />applicable NPDES permit. The IPM program involves the scouting of algae and aquatic weed <br />locations and densities, establishment of thresholds above which control is needed, and making <br />applications of aquatic herbicides on an “as-needed” basis to achieve the algae and aquatic weed <br />control necessary to convey water. <br /> <br />Depending on algae or aquatic weed presence, aquatic herbicides containing copper may be <br />applied as necessary between the months of April and November. Some years, no copper- <br />containing aquatic herbicides will be used. Treatments may be made to only small sections, or <br />may be made throughout the lagoon. <br /> <br />Copper-containing aquatic herbicide applications will be done over a short duration (typically less <br />than approximately 36 hours per location) and not all areas of the lagoon will be treated at the <br />same time, for the same length of time, or treated every year. Depending on weed presence, <br />some portions of the Lagoon may not get treated at all while others may require multiple <br />treatments the same season. Copper-based herbicides will be discussed for checklist item a) <br />above. All other checklist items will be discussed together at the end of this section. <br /> <br />Prior to aquatic herbicide applications, the following tasks will be accomplished: <br /> <br />1. A written recommendation is prepared by a DPR-licensed Pest Control Advisor (PCA). A <br />PCA undergoes 40 hours of training every 2 years on issues including health and safety <br />and prevention of exposure to sensitive receptors. The written recommendation <br />prepared by the PCA must evaluate proximity of occupied buildings and people, and <br />health and environmental hazards and restrictions, and include a certification that <br />alternatives and mitigation measures that substantially lessen any significant adverse <br />impact on the environment have been considered and if feasible, adopted. Refer to <br />Appendix C. <br /> <br />2. All City or contractor personnel applying herbicides review and strictly adhere to the <br />aquatic herbicide product label that has clear and specific warnings that alert users to <br />hazards that may exist. An example of a specific product label is included in App endix <br />D. <br /> <br />3. All City or contractor personnel applying herbicides review and consult the aquatic <br />6.3.A. - Page 49