07/25/2019 BOARD OF HEALTH Minutes

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With respect to emergency contaminants, there are currently four dioxane sites and 10 PFOS and PFOA sites—three pre-existing and seven new. The Commonwealth has recently proposed some standards that involve all six PFAS, not just PFOS PFOA. At present, there is no federal maximum contaminant (MCL) level for dioxane,but the EPA has a risked base screening level that the base is working with. There is also no MCL for PFAS, but there is a lifetime health advisory(LHA)for PFOS and PFOA, and the Air Force has a policy to mitigate a risk that's associated with concentrations of PFOS and PFOA above the LHA. The Commonwealth proposed new PFAS standards in April 2019 and, based on prior sampling, Mashpee Water District turned off one of their public water supply wells at Turner Road, Mashpee Village public water supply well is also down. Well-head treatment is being put on the Mashpee Village well,and should be completed within a month. Mass DEP is providing bottled water to homes that have concentrations, and are planning to request sampling of other public water supply wells in the area. Ashumet Valley remedial investigation is underway and remediation for the legacy compounds that have been out there for years. Additionally, testing is being done there for PFOS, PFOA and dioxane. -There were 14 private wells that were impacted in the past, none pf which are currently above the LHA. Fourteen (14) individual residences and 93 units in Lakeside have been connected to Town water. Residents have expressed concern about swimming "and fishing in Ashumet and John's Pond because surface water is above the LHA. In summer 2019, Mass DPH issued recreational use of water bodies, including Ashumet and John's ponds, but there is no concern for swimmers and fishing there is strictly catch/release. PFOS and PFOA are an ingestion hazard and not a dermal hazard. The base has resumed investigating the Fire Training Area, even though it was remediated once before. It is a complicated site. There are high concentrations of PFOS and PFOA at the source are, and it is continuing to leach, acting as a source to groundwater. Some flowed down into the Ashumet Valley plume, and some went into Ashumet Pond—both kettle hole ponds. It is also the reason that Mashpee Village public water supply well was shut down. PFOS and PFOA are very persistent in the environment, and do not degrade. Ms. Forbes provided a draft outline of what the PFOS and PFOA plume is going to look like,stating that it is much larger than the largest CS-1 plume. Chair Baumgaertel asked,with respect to properties in the Ordinance 1 area, if the base has a continued permanent responsibility, and Ms. Forbes answered in the affirmative. Chair Baumgaertel stated that there is not a lot of science relating to what concerns exist for irrigation wells;therefore,the board has emphasized with the property owners that those wells should not be used for drinking or watering/cleaning anything that is intended for ingestion. Mr. Carson indicated that the board is taking the right approach, as long as they are providing the information to the property owners. 7:55—100 Great Neck Road North Mr. Harrington commented that the owner of 100 Great Neck Road North, Richard Halpern, sold the property without having septic inspections performed. Additionally, with cesspools on the property, a variance from the local Cesspool Regulation is required, but was not requested. A show-cause hearing was scheduled for the last meeting, which was cancelled. Mr. Harrington spoke with Mr. Halpern who explained that responsibility for the septic system was accepted by the purchaser of the property. Mr. Halpern provided Mr. Harrington with an excerpt of the purchase and sales agreement, indicating that the purchaser did accept the septic responsibility. 3