8/19/1997 BOARD OF SELECTMEN Minutes

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/r t LL f 4 MASSACHUSETTS MILITARY RESERVATION May 1997 emicapi - A fact sheet providing information on one of the groundwater plumes at the Massachusetts Military Reservation P.. °. of this fact sheet xs==:ta :pov ice : Eleven other potential source areas have been iden- ,bkkouritl: eta thheern �cal- p1=l :: ::(CS = 3 tified in the western and central portions of the rout Vater iur-ne-,: one of .-dIeven: : �-auridv�ater;: plume that likely contribute to the plume. In addi- P .-.. ...-. former waste storage/disposal fume mar�a�ng firm. the.�.1�Iassaa ttseas::::�i�I�ar}�:: tion, more than 180.fo :..._: structures and associated contaminated soils have eservat�on . been removed. A majority of these structures were :�tdject :managers from the Airt}rce:;::tenter:::for:: located above the CS-10 plume and may have been E61ronmenta�l :Excellence (A-FCEE) _th� �:T&*,.% contributing to it. .. -Environmental Protection Agency: ,(U' EPA) arid:: •the 'Massachusetts f3epartn��nt of- EnvirohmenW.. What I a Plume? Protection :(DEP)-wJ11 '.be.evaluating'a1tematiVes;-to TecommendAhe'most appropriate .cleanups utian5: A groundwater plume is a body of groundwater for •this fume. The alternatives currently wader_ containing contaminants exceeding federal and state ." . :-consideration are described in-- the a om'''an-ying= drinking water levels at multiple well location. fact..sheet,-Introduction to �CS O:Pune: Respons .::: Contaminated water can result when fuels, solvents, 4ttertirtves: or other potential contaminants are spilled or released on^the ground. when these materials filter Public involvement during the decision-making. through the sand Cape Cod soil, the encounter . .is:. .. . g y P Y period; ...crlocal to selecting an alternaty� that:not;: groundwater, or the water table, where the soil is on]}� cleans up the plume and meets regulatory saturated with water. As the groundwater moves, r y-irements, but also rs ac eptal let tie affected the contaminants are dissolved and carried with it, communities: This fact sheet (alongv=itb ''an-, creatinga groundwater fume. P -.=accompanying -fact sheet .called •Grauh&Vater 'ecxtmet Technologies) willroide haert}und Affected Area ltiformatiori .:in -:.an effort to heli people make i0ot. ted decisions. The attached map depicts the CS-10 plume. Most of the plume affects the south-central area of the base. **� The plume is approximately 17,000 feet long, a Source of the CS=10 Plume . maximum of 4,000 feet wide, and vanes in thick- The rima source of the CS-10 groundwater ness up to 140 feet thick. The eastern lobe of CS-10 primary plume is the 38-acre area of the former BOMARC has migrated in the groundwater off-base near the Missile Site and .curr nt nit Training Equipment Falmouth Gate. It has been trached to the edge of e U g Site (UTES) located near the eastern bounds of- Ashumet Pond. In general, the CS-10 plume is over boundary the MMR. The BOMA Missile Site was o er- 120 feet below ground and 60 feet below the water RCM P most of its length. Studies are currently y ated between 1962 and 1973 and UTES has been table along gt y operated from 1 maintenance and underway to determine whether the plume is flow- ing 978 to present for storage of armor led vehicles. In ing deep in the groundwater under the pond or g ed and other wheeled the past, spills occurred in whether some of the plume is discharging into.the P p s and releases of chemicals o . these areas. preliminary pond. None of the primary contaminants contained Since December 1995, a p ary Pollution re lace at in the CS-10 plume have been detected in the prevention program has been �n p UTES toensure that current petroleum use and dis- posal do not affect the groundwater. x .i.