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 Lakes Association, we prepared the enclosed permit 

applications for nuisance aquatic plant management 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 boating lane that extending from the Salisbury 

School dock to Third Lake 

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

• Herbicide will be applied at a depth approximately 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 maintained 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 final treatment areas to be provided following pretreatment survey. Tentatively scheduled for mid-July – August. 

3. East Twin Lake – maintenance spot-treatment of milfoil 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 final 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 basins 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 Lake will proceed in mid-May. The demonstration 

treatment area on the Second Lake was selected based on input from Nancy Murray. No mapped state 

protected plant species are located within the treatment proposed treatment 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 level performed in 2006. The following tasks will be 

performed to complete the required monitoring in 2007: 

1. Early season vegetation survey – a visual inspection 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 inspection to monitor efficacy of the 2007 treatment 

and assess non-target impacts. 

4. Late-season comprehensive transect/data point sampling 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 the permit applications. Please do not hesitate to contact 

us if you have any questions or if any additional information is required. 

Sincerely, 

AQUATIC CONTROL TECHNOLOGY, INC. 

Marc Bellaud 

Senior Biologist 

cc: Salisbury Inland Wetlands Agency 

cc via e-mail: Curtis Rand, First 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 
850 ft

500 ft

500 ft

#

#

#

FIGURE: SURVEY DATE: MAP DATE:

-- 2/20/07

Twin Lakes

East Twin Lake -

Proposed Treatment Area - 2007

Salisbury, CT

11 JOHN ROAD

SUTTON, MASSACHUSETTS 01590

PHONE: (508) 86 5-1000

FAX: (508) 865-1220

WEB: WWW.AQUATICCONTROLTECH.COM

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--

0 275 550 1,100 1,650 2,200 2,750

Feet

Legend

Proposed treatment area for 2007

Maximum Treatment Area of 60 acres

Approximate State Listed species distribution

reported by NEAR, Inc. in September 2000
S

URVEYDATE:MAPDATE:

--02/07/07

TwinLakes

SecondLake-

ProposedTreatmentArea2007

Salisbury,CT

11JOHNROAD

SUTTON,MASSACHUSETTS01590

PHONE:(508)865-1000

FAX:(508)865-1220

 ̄

WEB:WWW.AQUATICCONTROLTECH.COM

FIGURE NUMBER

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Legend

02004008001,2001,6002,000Fe

et

2007Proposedtreatmentarea~13acres
FIGURE: SURVEY DATE: MAP DATE:

-- 2/20/07

Twin Lakes

Third Lake -

Proposed Treatment Area - 2007

Salisbury, CT

11 JOHN ROAD

SUTTON, MASSACHUSETTS 01590

PHONE: (508) 86 5-1000

FAX: (508) 865-1220

WEB: WWW.AQUATICCONTROLTECH.COM

 ̄

--

0 230 460 920 1,380 1,840

Feet

Proposed treatment area for 2007 -

maximum 25 acres

Legend