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below the SAS. If the board were to approve the requested depth to groundwater, it would be limiting . <br /> the property to the extent that it could never increase flow. Mr. Harrington also recommended that a <br /> note be added to the plan stating that no abutting septic systems are located within 10 feet of the <br /> proposed septic system. <br /> Daniel Ojala, of Down Cape engineering, introduced himself for the record. He informed the board that <br /> the test hole was dug to a depth of 11-feet but,because it's a deep system,groundwater was not reached. <br /> Mr. Ojala agreed that they do not want to unnecessarily burden lot owner, and will confirm five (5)feet <br /> to groundwater at the time of installation. Mr. Harrington observed test hole, and noted that access to <br /> backyard is extremely tight. <br /> Board members discussed moving the system back two (2) feet from the house, since the abutting lots <br /> are vacant, but Mr. Harrington expressed concern that putting it closer to the property line could result <br /> in damage to the reserve area during excavation. <br /> There being no further comments or discussion, Mallory Langler moved to approve the septic plan for 87 <br /> Summersea Road with the following conditions: 1)variance for the one-foot reduction to groundwater is <br /> denied, and confirmation of five feet of pervious soil below the SAS at time of construction is required; <br /> and 2) a note stating that no abutting septic systems are located within 10 feet of the proposed septic <br /> system shall be put on the plan. Motion seconded by Laurel Almquist. VOTE: Unanimous(3-0). <br /> 7:25—Joint Base Cape Cod <br /> Rose Forbes and Doug Carson introduced themselves for the record, and Ms. Forbes provided the <br /> following update. <br /> Ordinance Area 1 straddles the base and the Town of Mashpee. It crosses a number of private properties, <br /> but the government cannot put a Land Use Control on off-base properties. Signage can be put up,annual <br /> magnetometer surveys can be performed, and annual notifications can be sent to property owners. If a <br /> property owners wants to do any type of site work,they should have USO construction support, but the <br /> Air Force cannot pay for that. The other option is to conduct DG mapping, but that would require <br /> removing all the trees. Properties owners with whom the base consulted stated they did not want to cut <br /> down all of their trees. Mr. Harrington stated that the Conservation Commission reviewed Ordinance <br /> Area 1 and were in agreement that they did not want to not cut down trees. However, commissioners <br /> were also looking for additional magnetometer surveys. <br /> Remediation is ongoing for legacy contaminants In the CS-10 plume, including the portion that is in <br /> Mashpee. In 2014/15,the EPA requested the base begin looking at emerging contaminants. In addition <br /> to the VOCs that the base has been treating since 1999,they are now adding dioxane as a contaminant of <br /> concern. It is not a big problem, as it is in relatively small concentrations, all of which are on the base. <br /> The FS-1 EDB plume is gone, but PFOS and PFOA now has to be addressed. The base is proposing to shut <br /> down the one remaining operating extraction well because it was installed for EDB and is not really <br /> targeting the PFOS and PFOA. There is a lot more that needs to be done than the one extraction well can <br /> handle. <br /> In the Fire Training Area there is primarily PFOS and PFOA. There is dioxane in the Ashumet Valley plume <br /> but not at the source area. There are surface water and groundwater impacts from the PFOS and PFOA. <br /> 2 <br />