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e_ngln.e, ers <br />dvers fied <br /> <br />Main Offlc®: P.O. Box J. Osseo, Minnesota 55369 (612) 425-2181 <br />Bough Office: 8500 210th St. W.. Lakevllle, Minnesota 55044 (612) 469-3881 <br /> <br />June 18, 1981 <br /> <br />Honorable Mayor and City Council <br />City of Ramsey <br />15153 No.then Boulevard <br />Anoka, Minnesota 55303 <br /> <br /> Re: Comprehensive Water Study <br /> Phase I <br />OGentlemen: <br /> <br />The Ramsey City Council authorized the preparation of a comprehensive water study <br />on April 14, 1981. The study was to be performed in two phases. Phase I was to <br />evaluate the feasibility of.wells as a. source of water supply. .Phase II was to <br />contain the design criteria, source and storage needs, trunk watermain locations, <br />and financial considerations which are generally presented in'a comprehensive plan. <br /> <br /> Phase I of the study has been completed, and the results are summarized in this <br /> letter. Specifically, this brief report will discuss the different types of wells <br /> commonly used for municipal water supply in the Twin Cities Area; the sub-surface <br /> geology of the City of Ramsey; and the suitability of Ramsey's geology for the <br /> development of municipal water supply wells. The remaining elements of the compre- <br /> hensive water study will be prepared and submitted in a later report, after the <br />OCouncil authorizes the Phase II work. <br /> Water wells can be classified into two general groups, drift wells and rock ' <br /> wells. Drift'wells draw their water from the glacial drift which extends from <br /> 'the ground surface to the first bedrock layer. Glacial drift consists of soil, <br /> gravel, boulders, etc., deposited as the glaciers advanced and retreated across <br /> this area thousands of years ago. The drift can have widely varying permeability <br /> and, thus, widely varying suitability as a source of water. Water in the glacial <br /> drift is slightly more prone to contamination than water in the deeper bedrock <br /> formations, since pollutants introduced at or near the ground surface can readily <br /> percolate down to the drift water table. <br /> <br /> A drift well is constructed by extending a steel casing to the top of the'water <br /> bearing formation. A stainless steel 'screen equal in length to the thickness <br /> of the aquifer is attached to the bottom of the casing. The screen is specially <br /> selected for the particular sand and gravel in the aquifer, in order to prevent <br /> sand from entering the well during pumping. <br /> <br />cml · municipal · planning · environmental · land surveying · geotechnics · waste treatment <br /> <br /> <br />