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r � Subp. 4. Slaughter houses. Slaughtering and dressing room 4715.1160 BACKWATER VALVES. drains shall be equipped with separators or interceptors approved by the administrative authority,which shall prevent the discharge Subpart 1. Where used. Drainage piping serving fixtures that aze into the drainage system of feathers, entrails, or other material ��ated below the elevation of the curb or property line at the poinf likely to clog[he drainage system. where the building sewer crosses under the curb or property line, and above the crown level of the main sewer,shall drain by gravity STAT AUTH:MS s 326.37 to 326.45 into the main sewer,and shall be protected from back flow of sew- 4715.1140 VENTING OF INTERCEPTORS age by installing an approved backwater valve,and each such back- water valve shall be installed only in that branch or section of the AND SEPARATORS. drainage system which receives the discharge from fixtures located below the elevation of the curb or property line. Interceptors and separators shall be so designed that they will not become airbound if closed covers are used. Each interceptor or FuRher,in every building hereafter erected or remodeled so that � separator shall be properly vented. . the erection or remodeling creates a new dwelling use which is located below the elevation of the point where the building sewer STAT AUTH:MS s 326.37 to 326.45 crosses under the curb or property line, all fixtures installed be- low such point shall be connected to a separate branch drain. Each 4715.1150 MAINTENANCE OF such branch drain shall be protected by an approved backwater INTERCEPTORS AND SEPARATORS. valve and a gate valve. The gate valve shall be located on the sewer connection side of the backwater valve. Interceptors and separators shall be maintained in efficient oper- � ating conditiomby periodic removal of accumulated grease,scum, FuRher,the backwater valve and gate valve may be waived by the oil,or other floating substances, and solids,deposited in the in- administrative authority whenever the sanitary sewer dces not re- terceptor or sepazator. ceive any storm water drainage and the building is located at a suf- ficient height above the public sanitary sewer so flooding by backflow Each interceptor and separator shall be so installed that it is readily Will not occur,in the opinion of the administrative authority. accessible for removal of cover, servicing, and maintenance. If Subp.2. Construction of backwater valves. Backwater valves installed substantially below grade a manhole with flush man- shall be constructed so that a mechanical seal a amst backflow hole cover should be provided. g will be provided. Backwater valves shall have all balls or bearing STAT AUTH:MS s 326.37 to 326.45 ' parts of noncorrodible material and shall have bolted covers and be readily accessible for cleaning. Subp. 3. Venting of backwater valves. Where the installation and operation of backwater valves interfere with the proper ven- tilation of the plumbing system, additional vents shall be pro- vided so as to assure adequate ventilation of the plumbing system when the backwater valves are in a closed position. Subp.4. Accessibility of backwater valves. Backwater valves shall be installed so their working parts will be readily accessibie for service and repairs. If installed substantially below grade a manhole with flush manhole cover shall be provided. STAT AUTH: MS s 16B.62;326.37 to 326.45 HIST: 19 SR 590 30