Appendix E Public Comments and Responses

Appendix E Public Comments and Responses

This document contains the public comments received by the District during the public comment period of IS/MND prepared to support the District's use of copper-containing algaecides and/or molluscicides under SCH Number 2022060526. Comments were received from CDFW and Ventura County Public Works. Response documents were transmitted and no further action was required. Casitas Municipal Water District proposes to apply copper-containing algaecides and/or molluscicides in compliance with Water Quality Order 2013-0002-DWQ (CAG990005) Statewide General NPDES Permit for Residual Aquatic Pesticide Discharges to Waters of the U.S. from Algae and Aquatic Weed Control Applications & Water Quality Order 2016-XXXX-DWQ (CAG990006) Statewide General NPDES Permit for Biological Pesticides and Residual Chemical Pesticide Discharges to Waters of the U.S. from Aquatic Animal Invasive Species Control Applications to control algae and invasive mussels that threaten to degrade Lake Casitas' existing and potential beneficial uses. Nuisance algae growth can degrade aesthetic and recreational functions of the lake and present operational challenges to reservoir and water treatment facility managers. In addition, cyanobacteria (blue-green algae) blooms can produce cyanotoxins which impart undesirable taste and odors to lake water and drinking water and can be harmful to humans, domesticated animals, and wildlife. Dreissenid mussels have been identified in nearby waterbodies and pose an immediate threat due to their ability to colonize in and block water delivery infrastructure and strip food from the water that is necessary to sustain other aquatic life.

Casitas Springs, Oak View

Ventura

Unincorporated

California Air Resources Board (ARB), California Department of Fish and Wildlife, South Coast Region 5 (CDFW), California Department of Parks and Recreation, California Department of Pesticide Regulation (DPR), California Department of State Parks, Division of Boating and Waterways, California Department of Transportation, District 7 (DOT), California Department of Water Resources (DWR), California Governor's Office of Emergency Services (OES), California Highway Patrol (CHP), California Native American Heritage Commission (NAHC), California Natural Resources Agency, California Regional Water Quality Control Board, Los Angeles Region 4 (RWQCB), California State Lands Commission (SLC), State Water Resources Control Board, Division of Drinking Water, State Water Resources Control Board, Division of Water Quality

Other ((No development nor ground disturbance will occur))

NPDES Permit for Algae and Aquatic Animal Invasive Species Control

Biological Resources, Hydrology/Water Quality