Lincoln Conservation Commission Town Office Building 16 Lincoln Road Lincoln, MA Via & USPS First-Class Mail

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1 December 7, 2015 Lincoln Conservation Commission Town Office Building 16 Lincoln Road Lincoln, MA Via & USPS First-Class Mail RE:, Lincoln, MA 2015 Aquatic Vegetation Report Dear Commission Members: In accordance with the Order of Conditions, DEP File # (expiration date: 5/27/16), please find enclosed the 2015 Aquatic Vegetation Management Report for. The aforementioned document includes a summary of ACT s 2015 surveys and treatments, as well as an anticipated management plan for Should you have any questions, please feel free to contact us at the office via telephone () or (). Sincerely, Dominic Meringolo Senior Environmental Engineer DMM/rlg Enclosures FarrarPd15_rpt_final cc: William Winchell, M.D., President, Associates (via USPS first-class mail & ) (508) West Main St (Route 9) Spencer, MA 01562

2 2015 Year-End Report Lincoln, Massachusetts Aquatic Control Technology, LLC. (ACT) was contracted (Contract # ) by the Associates to conduct an Aquatic Plant Management Program to manage invasive aquatic vegetation species; Cabomba caroliniana (C. caroliniana, Fanwort) and nuisance filamentous algae, in in In accordance with this contract, the following document serves as a Year-End Report to summarize the tasks completed in These tasks included pre- and interim- management surveys, conducting herbicide and algaecide treatments, and completing a post-management survey/year-end report. Permit Information Order of Conditions (OOC) MA DEP License to Apply Chemicals for Control of Nuisance Aquatic Vegetation DEP File # Expiration Date Application Submitted Permit Received /27/2016 5/07/2015 5/08/2015 Pre-Management Survey On May 15, 2015, an ACT Biologist/Applicator conducted a pre-management survey at. The purpose of this survey was to document the distributions and densities of aquatic vegetation within and to assess the best method of treatment. Results of this survey were: trace moderate growth of Fanwort (Cabomba caroliniana) in three (3) separate locations, dense coverage of Fern-Leaf Pondweed (Potamogeton robbinsii) and sparse coverage of Curly-Leaf Pondweed (Potamogeton crispus) throughout the entire water body, refer to map ( Figure 1: May 15, 2015 Distribution of Aquatic Vegetation ). Herbicide Applications Image 1: Pre-management image of Fanwort in Farrar Pond. A total of three treatment events occurred over the course of the 2015 management season to manage Fanwort and filamentous algae in. Information pertaining to these treatment events, including notification and treatment dates, herbicide product used, and amount of herbicide applied is provided in the following table. December 7, 2015 Page 1 of 3

3 Treatment Date Herbicide Product (active ingredient) Amount of Herbicide Used May 29 nd Sonar Q (fluridone) 40 pounds July 7 th Sonar One (fluridone) 40 pounds August 28 th Sonar Q (fluridone) Captain (chelated copper) 10 pounds 15 gallons Post-Management Survey On October 5, 2015, ACT Biologists conducted the post-management survey at. The survey showed severely degraded, individual or small patches of Fanwort at the two westerly locations in Farrar Pond, refer to map ( Figure 2: October 15, 2015 Distribution of Fanwort). The target species filamentous algae also showed a reduction in density throughout the water body from the August treatment. As seen in Images 2 and 3 below, the Fanwort was severely affected by the treatment program as they were chlorotic and degrading. Image 2: Chlorotic Fanwort. Image 3: Chlorotic, degrading Fanwort. Additional vegetation species observed consisted of: Common Name Ribbon-Leaf Pondweed Fern-Leaf Pondweed White & Yellow Water Lily Coontail Water Bulrush Watershield Bladderwort Scientific Name Potamogeton epihydrus Potamogeton robbinsii Nymphaea odorata & Nuphar variegata Ceratophyllum demersum Scirpus subterminalis Brasenia schreberi Utricularia sp. Tiny Pondweed Potamogeton pusillus The majority of species were primarily noted in the coves throughout the water body as well as in the southern wetland section of the pond at varying densities trace to dense (Figure 3) Report December 7, 2015 Page 2 of 3

4 Conclusion/Recommendations Results of the pre- and post-management surveys suggest that the 2015 herbicide treatments significantly affected the target species Fanwort and filamentous algae. In 2016 ACT recommends continued treatment of Fanwort areas throughout, as well as continued filamentous algae management. Please note that Water Chestnut, typically observed in was not observed in 2015, however, Curly-Leaf Pondweed continues to persist within the pond. That being said ACT recommends considering an early season, whole waterbody treatment for Curly-Leaf Pondweed in order to manage the species before it has a change to proliferate any further Report December 7, 2015 Page 3 of 3

5 Figure 1: May 15, 2015 Distribution of Aquatic Vegetation Sparse growth of Curly-Leaf Pondweed Trace to sparse Fanwort Sparse to moderate Fanwort Moderate to dense Fern-Leaf Pondweed Lincoln Massachusetts Data Collected: 5/15/2015 Map Prepared: 10/13/2015 For: Associates :9,000 1,060

6 Figure 2: October 2015 Distribution of Fanwort (Cabomba caroliniana) Trace to sparse Fanwort (chlorotic) 0.82 acres Lincoln, MA Map Prepared: 10/7/14 Data Collected: 9/30/14 For: Associates :8,000 1,200

7 Figure 3: October 2015 Distribution of Remaining Vegetation Species (page 1 of 2) Fern-Leaf Pondweed (Potamogeton robbinsii) Clasping-Leaf Pondweed (Potamogeton perfoliatus) Coontail (Ceratophyllum demersum) Trace to sparse intermittent growth Trace growth Sparse growth Sparse to moderate intermittent growth Dense growth Floating-leaved species (Nymphaea odorata), (Nuphar variegata), and (Brasenia schreberi) Moderate growth Bladderwort species (Utricularia sp.) American Waterweed (Elodea canadensis) Trace to sparse intermittent growth Sparse growth Dense growth Lincoln, Massachusetts Trace growth Sparse growth Data Collected: 10/05/15 Map Prepared: 10/05/15 For: Associates Sparse growth 0 1,000 1:17,750 2,000

8 Figure 3: September 2015 Distribution of Remaining Vegetation Species (page 2 of 2) Low Water-Milfoil (Myriophyllum humile) Bul rush sp. (Scirpus sp.),,,, Trace Sparse Moderate Dense!(!( Note: Filamentous algae observed throughout the majority of the water body at sparse to moderate abundances. Lincoln, Massachusetts Data Collected: 10/5/15 Map Prepared: 10/6/15 For: Associates 0 1,000 2,000 1:17,750

9 Figure 4: October 2015 Water Quality Data E Water Quality Sampling Location Inlet/Outlet* E E Temperature:17.6 C Dissolved Oxygen: 8.4 mg/l ph: 7.5 Secchi Disk reading: to bottom Water Depth: 5.3' E Temperature:18.1 C Dissolved Oxygen: 7.89 mg/l ph: 7.0 Water Depth: less than 2' * red arrow indicates flow direction Temperature:17.4 C Dissolved Oxygen: 6.3 mg/l ph: 7.0 Water Depth: less than 2' Lincoln, MA Map Prepared: 10/6/15 Data Collected: 10/5/15 For: Associates :8,