04/03/2023 SELECT BOARD Minutes - Laserfiche WebLink

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10 Mashpee Select Board Minutes April 3, 2023 APPOINTMENTS &HEARINGS _ w k_.,w Sediment Briefing: Baseline Mon torin� ,,_Interim Measures Focused Feasibili�ywwAssessment Nutrient Santuit Pond Sedime ........, ._ _ Inactivation Dosing Study Results: Matt Ladewlg, TRC Consultants: (continued) For aeration and circulation, it is recommended the SolarBee circulators that are in place continue. Algaecides may be of use to control the blooms,but will not address the underlying cause. Nutrient Inactivation could be used to treat the cause by binding the phosphorus. (phosphorus release from sediments). However, this would require additional study. To convert the iron-bound phosphorus into a form that will be more effectively retained in the sediments of Santuit Pond, nutrient inactivation using alum(aluminum sulfate)buffered with sodium aluminate is recommended. This treatment has been used in other ponds on the Cape and throughout Massachusetts. This product is safe to handle, and if applied appropriately there should be no significant impacts or fish kills. The products are also used widely to remove pollutants from drinking water as part of the treatment process. It is estimated this product would cost several hundred thousand dollars. Federal grant funds may be available. It is recommended this option be studied further to ensure safety and efficacy of sediment nutrient inactivation. There is also a need to conduct public outreach. In moving forward, the Select Board agreed to take this under advisement to conduct further due diligence. This would include review of the scope, next steps for nutrient inactivation and review of the 319 NPS Grant application to fund the treatment. Permitting, the dosing plan, treatment options, monitoring requirements and public outreach would also be further reviewed and considered before action is taken. Discussion and AWroyal of the Followin g Resignations,and_Apl o ntments: , . . : Resi�1ation„Mashllee,Commum mmmGarden Advisory Committee: John Carter Term Exires,June 30 u .__. _... Correspondence was received from John M. Carter dated March 16, 2023 resigning from the Mashpee Community Garden Advisory Committee, effective March 16, 2023. Motion made by Selectman Cotton to accept the resignation of John M. Carter from the Mashpee Community Garden Advisory Committee with regret sending a letter of appreciation to Mr. Carter for his service to the Town of Mashpee. Motion seconded by Selectman O'Hara. VOTE: Unanimous. 5-0. Roll Call Vote: Selectman Weeden,yes Selectman Cotton, yes Selectman O'Hara, yes Selectman Sherman,yes Selectman Wyman-Colombo, yes Opposed, none