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_E <br /> 17 0 trl�1:1.1 161 F <br /> MASHPEE WATERWAYS COMMISSION <br /> MINUTES, 6 JULY 1999 <br /> 99 t1rTV1 -3 IiH I 1 � 16 <br /> Chairman Jim Hanks called the meeting to order at '7:a4 p.m, in Conference Room #3 of <br /> the Mashpee Town Hall. <br /> Present: Jim Hanks, Donald Lund, Fred Fordham, Herb Silver, Bill Taylor and Jerzy Daly. <br /> Others: Bill Kearfoot, Doug Kneale, Rick York and Ed Baker. <br /> MR. KEARFOOT'S PRESENTATION: <br /> Mr. Kearfoot of K--V Associates in Mashpee explained that subsidence deepening is a <br /> mining technique for removing sand at depths below the surface. One benefit is that most <br /> of the time the sand you dig up is very good glacial sand. <br /> Mr. Daly asked if it was passible to pump the sand to another location. Mr. Kearfoot said <br /> you could and showed some examples. <br /> Mr. Kearfoot went on to explain that when you are dealing with subsidence deepening, <br /> basically you are mining below the surface. It creates a cavern underneath the surface <br /> deposits. It removes the sand. The sand is either immediately transferred to the surface to <br /> put on top of the lake deposits or it is transported somewhere else. The lake deposits then <br /> subside. If your purpose is to reverse layer, you would put the sand on top of it. That <br /> would be glacial sand. The sand is very clean and granular. <br /> Mr. Kearfoot then described two of his current projects, He stated that they are very <br /> carefial to look at what the rate of deposition is in an area relative to what you want in <br /> terms of depth. If you have an area where sand is moving into the region at a fainly rapid <br /> rate, that even though they may be able to deepen the area, you may not gel the sustained <br /> depth. Lakes have very little migration materia. <br /> There are a lot of similarities between this process and hydraulic dredging. There are <br /> basically two main pipe systems. There is the one that is used for water. They normally <br /> run about 6Q0 gallons per minute. Mr. Kearfoot showed a sand slurry pump. The glacial <br /> sands are like sandblast sand. They can eat through usual iron pipe in one to three day's <br /> time. Consequently, they use special alloys to make the sand slurry and pump it up at <br /> considerable pressure. <br /> 1 <br />