Laserfiche WebLink
Exhibit "D" <br />IR Impoundment #18 Management Plan <br />May 1992 <br />MMCD uses the insect growth regulator Altosid (methoprene) as its <br />primary larvicide (applied aerially via fixed wing aircraft as Altosand) <br />.and Dibrom (haled) and Punt (permethrin) as its primary adulticides. <br />2. PREVIOUS MANAGEMENT. <br />a. CONSTRUCTION AND WATER MANAGEMENT OF <br />IMPOUNDMENT #1. Impoundment #18 was constructed in <br />1958 following Fla. Dept. of Health guidelines, that only <br />mosquito producing high marsh was to be impounded Since its <br />construction in 1958, Impoundment #18 has been flooded only <br />during the summer months (approx- May - Oct.) when salt -marsh <br />mosquitoes are problematic. <br />b. LARVICIDING FOR SALT -MARSH MOSQUITOES. Over <br />the years, MMCD has employed a variety of larvicides. They <br />have included chlorinated hydrocarbons (DDT, BHC), paris <br />green and Florida Formula Oil have been used in IRC salt <br />marshes.. Since the mid -1970's Altosid adsorbed to sand <br />(Altosand) has been IRMCD's primary salt -marsh mosquito <br />larvicide. To the best of our knowledge, all of the above- <br />mentioned chemicals may have been used at Impoundment #18. <br />3. CURRENT MANAGEMENT. Currently at Impoundment #18 <br />iRMCD employs an IPM program. This includes flooding of the <br />impoundment during the summer months, typically larviciding the <br />impoundment with Altosand when it is first pumped up in the late <br />spring/early summer. Altosand is applied via fixed wing aircraft at the <br />rate of approx.. 8 lbs. per acre (=2.0+ oz. per acre) with a flagger <br />directing the aircraft to ensure even coverage. Ground ultra low volume <br />([TLV) adulticiding with Dibrom (naled) is conducted west of the <br />impoundment in Vista Royale and nearby developments when the need <br />is verified by District personnel- <br />4. <br />ersonnel <br />4. MOSQUITO PRODUCTION. IRMCD has maintained records of <br />aerial larviciding operations since 1976 with accurate records since <br />1984.. For the -period 1984-1991, all or a portion of Impoundment #18 <br />was treated ?an average of 0.6 times per year (=52.8 acres/yr., Table 3). <br />IV. MANAGEMENT CONSIDERATIONS. <br />A RIM regime is proposed for Impoundment #18, similar to the plan currently <br />implemented by IRMCD at other IRC impoundments, exccot that in an attempt <br />to maximize marsh -lagoon interchange, the Southeast Cell will be left open <br />10 <br />