10/21/1996 BOARD OF SELECTMEN Minutes

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F C WOODARD &CURRAN: a • A 1 Mr.Gregory Taylor, Director of Public works September Town of Mashpee ' P.D. Box 554 -, 41996 Mashpee,Mass. 02649 IN MA:5t1VJt;t:0=0 MEN'S Subject: Proposal-Development of Groundwater Monitoring Plan OFFICE Massachusetts Military Reservation Dear Greg: I have prepared this subject proposal in response to your request of September 16, 1996. The proposed approach . incorporates concepts and strategies stated in the letter from Kopelman and Paige,P.C. dated September 6, 1996 and our discussions over the past week. we generally concur with Kopelman and Paige' approach of developing a program that demonstrates that in addition to known plumes emanating from the MMR towards Mashpee town limits being addressed by the Government,that additional plumes and/or"branches"of existing ones may pose a threat to the Town. However,instead of developing a detail written groundwater monitoring plan for submission to the Government and incurring the cost associated with its preparation,we take an approach that relies on the same type of supporting documentation but focuses on presentation materials and negotiations. If our presentation of a recommended groundwater monitoring plan leads to fruitful negotiations with the Government,they can develop the work plan and implement the same at their cost,not the Town's cost. On the other hand, if the Government is not receptive to our recommendations, it will be relatively easy to take the next step and formalize our recommended groundwater monitoring approach into a written Groundwater Monitoring Plan. The process could then follow the approach offered by Kopelman and Paige. We propose the following scope of work to achieve the objective of being prepared to present,defend and negotiate an approach to monitor the groundwater resources of the Town of Mashpee that may be effected by plumes emanating from the MMR. T Task A-Establish Goats of the Groundwater Monitoring Plan. The purpose of this task is to determine the goals to be achieved with this effort that are important to the Town. I envision this to be accomplished as part of an afternoon or evening working meeting with interested parties of the Town. I would envision the goals that would be established could range from monitoring groundwater quality at residential areas and adjacent to ponds to determining if there is a need for a"sentinel"or warning system for municipal water supplies. Task B-Identification of Potential Receptors. This task will be done to assure that we have not only included potential receptors noted by the Government,but discuss others that may be unique to the Town. I propose that this would be discussed during the second half of the meeting to be held as part of Task A. Task C-Review of Relevant Technical Documents. We are aware that many technical reports have been prepared for work completed at the MMR. We will focus our review on those work products that deal with spills and waste disposal practices that if releases did occur could potentially impact groundwater flowing towards Mashpee. This would include going back to early documents that might have determined sites did not warrant further action. We will also focus on those documents that have attempted to model the aquifer in the Mashpee area and compare historical projections with actual plume migration. We will map our understanding of the site hydrogeology and contaminate plumes on the same map we used in identifying potential receptors. We will then locate all known monitoring wells and monitoring wells planned as part of the Strategic Plan. By studying the relationship of receptors,present and projected plume locations,present and planned groundwater monitoring locations,we will be able to identify if,and to what extent, gaps exist in providing groundwater monitoring plan that is protective of the Town` residents and resources. We are not recommending the Town do any groundwater modeling for this task, rather we use existing information in understanding the dynamics of the aquifer. 41 HUTCHINS DRIVE ■PORTLAND, MAINE 04102 ■207-774-2112