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From:Juan A.Bacigalupi To: Robert Whritenour Date:V9I96 Time:09:41:15 <br /> Page 5 of 9 <br /> patterns of the groundwater levels of the Cape Cod aquifer. <br /> Area residents and visitors raise the most complaints and concerns about pond levels and <br /> stream flow during summer and fall drought conditions. The containments stem's draw down will <br /> greatest impact o Y <br /> cause the gr p n the ground water during the summer and fall dry seasons. OPTECH <br /> needs to develop specific draw down figures for the summer no-recharge conditions,particularly <br /> g p Y <br /> during drought years(Theis draw down equation). Knowing the potential impacts during this low <br /> p P g <br /> groundwater period is critical(and during high flow periods), so that system designers can make <br /> design modifications to minimize those potential impacts. <br /> The groundwater model used to predict the draw downs and mounding for the 60%design <br /> assumed a constant head on surface water bodies. This is a fundamental flaw in any model used to <br /> design a containment system for the Cape Cod aquifer. The kettle hole ponds of Cape Cod are a <br /> reflection of ground water elevations. Stream flow in Cape Cod's groundwater fed streams is directly <br /> related to groundwater elevations and gradient. <br /> Mr. Cambareri also reported that he is skeptical of the ground water modeling information <br /> presented. The team concurs with Mr. Cambareri's reservations on the Plume Containment Plan <br /> presented. The major concerns raised by the team include: <br /> a. The impact of pumping on the aquifer and how will a hydrologic balance be <br /> maintained. what will be the impact of taking water out from one location and reinserting it <br /> at a different location? Will a balance be maintained? <br /> b. The impact of mounding and draw down on zone 2 well configurations. <br /> C. The impact of mounding and draw down on other contaminant sources and plumes, <br /> such as the Falmouth sewage treatment plant and the landfill. <br /> d. The impact of mounding and draw down on streams,ponds,wetlands,vernal pools, <br /> and cranberry bogs. <br /> The members of the team feel that OPTECH should look at alternative ground water flow <br /> models. OPTECH and the IRP should consider using the U.S. geological Services ModFlow model <br /> and multiple boundary conditions that accurately reflect natural resource interaction with the aquifer. <br /> These models should consider the impact of the plume containment activities on the Cape's natural <br /> resources. The Cape's natural resources are paramount for our economy. If the containment process <br /> negatively influences the natural resources, all will suffer. The team feels that OPTECH and IRP <br /> should take a new look at using reinjection wells downstream of the plumes beyond the stagnation , <br /> area. <br /> V, Schedule <br /> At this time,we did not have any consensus comments on the new proposed schedule. <br /> However, several members raised concerns on the proposal to use LF-1 as the primary contract and <br /> 4 <br />