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Y MEMORANDUM •'.f f Date: April 2006 1! From: EDQIE LUCCHESI,ASSISTANT MANAGER r�'I��tE3PE��7sS To: AGRICULTURAL AND INDUSTRIAL WASTE POND Subject: WASTE POND VEGETATION MANAGEMENT JUN 1 5 200- ENVIRONMENT HEALTH PERMIT/SERVICES As an owner and/or operator of a liquid waste pond system, you have several responsibilities in managing and operating.your pond and related drains,of which one is vegetation control to prevent mosquito development. Weeds controlled around the perimeter and surface of the pond, and along the ditch banks of drains, is the most effective mosquito control measure available to the waste pond system owner. Because state law classifies mosquito development as a"public nuisance", the owner or operator of the mosquito-breeding site is responsible for the prevention of mosquitoes. This district provides routine inspection service for all ponds in San Joaquin County to ascertain their condition and the status of any mosquito development. The district also performs mosquito control on the ponds to prevent adult mosquito emergence. The control operations cannot be performed economically or effectively when there is emergent vegetation around the perimeter and surface of the ponds and related drains. The district Is requesting that all owners and operators of liquid waste ponds implement a vegetation control program for their sites. The plan should contain the following objectives: 1. Maintain access ways to all waste pond roadways for mosquito control vehicles and maintenance activities,from March through November. 2. Eliminate and prevent emergent vegetation on inside slopes of liquid waste ponds and drains from March through November. 3. Eliminate and prevent the accumulation of manure and organic solids on the surface of liquid waste ponds. Any vegetation growing on floating manure or organic waste must be immediately controlled and prevented from re-occurring during the months of March through November. Pond owners can either perform the weed control themselves or contract with a licensed weed control company. The planning for weed control should start immediately. Certain types of chemicals used in controlling weeds must be applied during normal growing conditions, while others can be applied when the weeds are dormant.