## Aquatic Control Technology, Inc. 11 John Road ● Sutton, MA 01590-2509 ● (508) 865-1000 ● Fax (508) 865-1220 ● info@aquaticcontroltech.com 

## March 16, 2007

Ms. Judy Singer State of Connecticut Department of Environmental Protection 79 Elm Street Hartford, CT 06106-5127

Re: 2007 Permit Applications for Aquatic Herbicide Treatments at the Twin Lakes – Salisbury, CT

Dear Judy:

On behalf of the Town of Salisbury and the Twin La kes Association, we prepared the enclosed permit applications for nuisance aquatic plant ma nagement at the Twin Lakes in 2007.

The following activities are proposed for the 2007 season:

1. Second Lake/West Twin – demonstration milfoil treatment of 13 acre boating lane

• Treatment will be conducted to create a boati ng lane that extending from the Salisbury School dock to Third Lake

• Reward herbicide will be applied at 1 ga llon per acre (half the maximum label rate)

• Herbicide will be applied at a depth approxima tely 4-6 feet with a deep water injection system along the deep water edge of the milfoil bed.

• A 400 foot no-treatment buffer zone will be ma intained to the west of the treatment area to ensure the safety of the State Listed plants on the western shore of Second Lake. A 200 foot buffer zone will be maintained at the northern end of the treatment lane, where the lane is only about 100 feet wide.

• Treatment in Second Lake will be planned for mid May to target actively growing plants. At that time, milfoil plants are expected to be about 3-4 feet tall. Many native plants will not be active at this time, minimizing potential impacts on the plants in this area.

2. Second Lake/West Twin – spot-treatment of floating-leaf waterlily growth along developed shorelines with Rodeo herbicide. Map of fi nal treatment areas to be provided following pretreatment survey. Tentatively scheduled for mid-July – August.

3. East Twin Lake – maintenance spot-treatment of milf oil and curlyleaf pondweed with Reward herbicide, maximum of 60 acres proposed. Map of final treatment areas to be provided following pre-treatment survey. Tentatively scheduled for mid-June.

4. Third Lake/West Twin – maintenance spot-treatment of milfoil and curlyleaf pondweed with Reward herbicide, maximum of 25 acres proposed. Map of final treatment areas to be provided following pre-treatment survey. Tentatively scheduled for mid-June.

5. Third Lake/West Twin – spot-treatment of floating-leaf waterlily growth along developed shorelines with Rodeo herbicide. Map of fi nal treatment areas to be provided following pretreatment survey. Tentatively scheduled for mid-July – August.

6. Monitoring Program – continued monitoring with same protocol as 2006

### Twin Lakes - 2007 Project Description 

## 2 ACT, Inc. 

## Treatment Proposed milfoil treatment maps for all three lake basi ns are included. Similar to past years, we will conduct early season/pre-treatment surveys of the lakes in mid-late May to finalize treatment areas on East Twin, and Third Lake. Once treatment areas are finalized with the Town and Association, we will prepare and submit final treatment maps to DEP. Treatment will then be scheduled for a mutually agreeable dates in mid-June. The actual treatments will be guided and recorded using a Differential GPS system equipped with sub-meter accuracy.

The demonstration milfoil treatment on the Second La ke will proceed in mid-May. The demonstration treatment area on the Second Lake was selected b ased on input from Nancy Murray. No mapped state protected plant species are located w ithin the treatment proposed treatme nt area. Impacts to non-target species outside of the proposed treatment area will be evaluated post-treatment.

Monitoring The monitoring program will continue at the same le vel performed in 2006. The following tasks will be performed to complete the required monitoring in 2007:

1. Early season vegetation survey – a visual inspecti on to document and mark the extent of milfoil and curlyleaf pondweed cover using GPS and finalize treatment areas for 2007. 2. Water quality monitoring – three rounds of water quality monitoring, occurring in mid-late May, two weeks post-treatment, and in late August. 3. Post-treatment vegetation survey – a visual insp ection to monitor efficacy of the 2007 treatment and assess non-target impacts. 4. Late-season comprehensive transect/data point sampl ing using GPS and GIS. The transect survey will include a survey of all 131 pre-established transect points. 5. Submission of a Year End Report documenting all of the work conducted at Twin Lakes in 2007, including water sampling results and presentation of all vegetation data collected during the monitoring program.

Proposed, preliminary treatment maps and the proposed monitoring program are attached. We trust that this information is sufficient to initiate review of th e permit applications. Please do not hesitate to contact us if you have any questions or if an y additional informati on is required.

Sincerely,

A QUATIC 

## C ONTROL 

## T ECHNOLOGY 

## , I NC


## .

Marc Bellaud Senior Biologist

cc: Salisbury Inland Wetlands Agency

cc via e-mail: Curtis Rand, Firs t Selectmen, Town of Salisbury Nina Mathus, President, Twin Lakes Association Nancy Murray, DEP, Geological and Natural History Survey Peter Aarrestaad, DEP, Fisheries Chuck Lee, DEP, Lakes Program Brad Robinson, DEP, Pesticides, Bureau of Waste Management

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