08-11-1976 Council Agenda - Laserfiche WebLink

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UNIVERSITY OF MINNESOTA Minnesota Geologicel Survey TWIN CITIES 1633 Eustis Street St. Paul. Minnesota 55108 (612) 373 -3372 July 23, 1976 Mr. Roger Runyon 3046 LaBore Road Little Canada, MN 55109 Dear Mr. Runyon, As we discussed in our telephone conversation this morning, I am sending you a map which indicates the first geological formations that occur below the soil zone in the area around your home. I have colored yellow, the Hugo Sand Formation which underlies your home and the proposed housing development. The red dots indicate water -wells which draw water from a common sand and gravel body. The other homes shown on the map may have wells which obtain water from the sand and gravel unit below the Hugo Sand, but we have no record of these wells. I am enclosing the records of several water -wells shown on the .map. Although these wells vary in depth, they end at approximately the same elevation above sea level in the same sand and gravel formation. Whether groundwater withdrawn from the proposed housing development will affect future yields from this common water bearing formation (i.e. aquifer) is difficult to determine without extensive study. However, it appears that many homes already use this aquifer with little effect upon it. It is highly probable that if the sixty homes in the proposed housing development were to each have a well drilled into the aquifer used by you and your neighbors, very little effect would be noted in the groundwater supply available for your wells. Possibly, pumping from the sixty wells concentrated in such a devel- opment may cause a localized lowering of water levels in surrounding; welis, but lowering the "pumps,1n these> wells wili salve this problem In summary, although I cannot give you a definite statement regarding the influence the proposed housing development will have on water yields from the existing wells in your area, it appears such an effect would be minimal. If you have any further questions, please feel free to contact me. Enclosures B0 /rmm 0013 Sincerely, Bruce Olsen Geologist