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City of Elk River Design Standards <br />Upon completing the installation all exposed bolts and nuts shall be completely coated with an <br />approved bituminous rust preventative coal tar material. The entire tapping sleeve and valve <br />assembly shall be polyethylene encased. <br />2. Water Service Installation <br />Water service lines shall be installed in accordance with Minnesota Department of Health <br />standards. Where water service lines are installed alongside of sanitary or storm sewer service <br />lines, installation shall maintain the minimum specified clearances between pipelines and provide <br />proper and adequate bearing for all pipes and appurtenances. <br />Unless otherwise specified, installation of water service lines shall provide for not less than <br />seven- and one-half feet of cover over the top of the pipe and for not less than 18 inches of <br />clearance between pipelines. Also, at least 6 inches of clearance shall be maintained in crossing <br />over or under other structures. Where the service pipe may be exposed to freezing due to <br />insufficient cover or exposure from other underground structures, the water pipe shall be <br />insulated as directed by ERMU. <br />Service trenches shall be restored and compacted as specified for pipelines. <br />A. No dry tapping shall be allowed. Unless otherwise indicated, tap service piping may be <br />laid directly on any solid foundation soil that is relatively free of stones and hard lumps. <br />Tap service piping shall be installed in one piece without intermediate joint couplings <br />between the corporation stop at the watermain tap and the curb stop. All copper pipe and <br />appurtenances shall be joined by means of approved flared type threaded couplings. <br />Connection of tap service lines to the watermain shall be made with an approved <br />corporation stop, with the watermain tap being made from horizontal to an angle of not <br />more than 15 degrees from the horizontal. (2:30 and 9:30). Expansion loops shall be <br />directed horizontally, not vertically from the tap. A minimum of 3 full threads of the <br />corporation stop must engage in ductile iron watermain or a saddle must be used for the <br />connection as noted in the following table. <br />© City of Elk River, Minnesota — All rights reserved 12 <br />