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Board of Selectmen Minutes 5 January 11, 1999 APPOINTMENTS AND HEARINGS William Fisher-Plume Update? (continued) Mr. Fisher presented a report to the Selectmen relative to the above topic of discussion. The Storm Drain - 5 South plume (SD-5) scope of data was evaluated by Mr. Fisher. Investigation has proven that a portion of the plume discharges into John's Pond although the work performed by the military has not provided information to significantly improve the understanding of the "silt layer" informed Mr. Fisher. Mr. Fisher indicated that the lack of soil and hydrologic data from the silt layer make the conclusion that the silt layer is not a barrier to the upwelling of the plume into the pond is speculative. It appears that properties of silt layer were modified for the computer model to "allow" the plume to discharge to the footprint. It was noted that soil samples were not taken from the silt layer. The in pond borings did not penetrate the silt layer. We concur that an area of significantly elevated TCE exists indicated Mr. Fisher when referring to the TCE "hot spot." In addition, a detailed risk assessment of human and ecological health is in order informed Mr. Fisher. Additional information is contained in the Woodard and Curran document dated January 11, 1999. (enclosed) Copies of the report will be fumished to the MMR for comment. Mr. Taylor indicated that written comments postmarked by January 28, 1999 will be responded to in a Responsiveness Summary. He urged input from the community. Mr. Fisher will draft a memo to the MMR on behalf of the Board of Selectmen with respect to this regard. In other business, Mr. Fisher indicated that the CS-10 remediation project remains on schedule. The FS-1 system start up is expected to commence on April 1, 1999. He suggested the MMR factor in the full operation of the P-11 well which is a future water resource for the Town of Mashpee.