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HomeMy WebLinkAbout~Master - Relating to Sumps and Ejectors (Drainage Below Curb and Main Sewer Level) ORDINANCE NO. 2495 AN ORDINANCE AMENDING THE MUNICIPAL CODE OF THE CITY OF AMES, IOWA, BY REPEALING SECTION 28-1073 THEREOF AS SAID SECTION HAS HERETOFORE EXISTED AND ADOPTING A NEW SECTION 28-1073 TO BE ENTITLED "SUMPS AND EJECTORS--DRAINAGE BELOW CURB AND BELOW MAIN SEWER LEVEL"; REPEALING ORDINANCES OR PARTS OF ORDINANCES IN CONFLICT THEREWITH TO THE EXTENT OF SUCH CONFLICT AND ESTABLISHING AN EFFECTIVE DATE . BE IT ORDAINED BY THE CITY COUNCIL FOR THE CITY OF AMES, IOWA: Section 1 . The Municipal Code of the City of Ames, Iowa, be and the same is hereby amended by repealing Section 28-1073 "Sumps and Ejectors--Building Drains Below Sewer" as said section has heretofore existed. Section 2 . The Municipal Code for the City of Ames is further amended by enacting a new Section 28-1073, said section to read as follows : Sec. 28-1073. Sumps and ejectors--drainage below curb and below main sewer level. (a) Drainage piping serving fixtures that are located below the elevation of curb or property line at the point where the building sewer crosses under the curb or property line and above the crown level of the main sewer shall drain by gravity into the main sewer and shall be protected from backflow of sewage by installing an approved type backwater valve and each such backwater valve shall be installed only in that branch or section of the drainage system which receives a dis- charge from fixtures located below the elevation of the curb or property line. (b) Drainage piping serving fixtures that are located below the crown level of the main sewer shall discharge into an approved watertight sump or receiving tank so located as to receive the sewage or waste by gravity. From such sump or receiving tank, the sewage or other liquid waste shall be lifted and discharged into the building drain or building sewer by approved ejectors, pumps, or other equally efficient approved mechanical device. (c) The minimum size of any pump or any discharge pipe from a sump having a water closet connected thereto shall be not less than two (2) inches . (d) The discharge line from such ejector, pump or other mechanical device shall be provided with an accessible backwater valve and gate valve, and if the gravity drainage line to which such discharge line connects is horizontal, the method of connection shall be from the top through a "WYE" branch fitting. -2- (P) Building drains or building sewers receiving discharge frcr any pump or ejector shall be adequately sized to Prevent overloading. Two (2) fixture units shall be allowed for each gallon per minute of continuous flow. (f) Backwater valves , gate valves , motors , compressors , air tanks, or other mechanical devices required by this section shall be located where they will be readily and easily accessible for inspection and repair at all times and unless continuously exposed, shall be enclosed in a water tight masonry pit fitted with an adequately sized removable cover. (g) The drainage and venting systems in connection with fixtures , sumps, receiving tanks and mechanical waste lifing devices, shall be installed under the same require- ments as provided for in this code for gravity systems . (h) Sumps and receiving tanks shall be watertight and shall be constructed of concrete, metal or other approved materials . If constructed of poured concrete, the walls and bottom shall be adequately reinforced and designed to recognized acceptable stand- ards . Metal sumps or tanks shall be of such thickness as to serve their intended purpose and shall be treated internally and externally to resist corrosion. (i) All sumps and receiving tanks shall be automatically discharged and when in any °°public use" occupancy shall be provided with dual pumps or ejectors arranged to function independently in case of overload or mechanical failure. The lowest inlet shall have a minimum clearance of two (2) inches from the high water or ' starting' level of the sump. (j) Sumps and receiving tanks shall be provided with substantial covers having a bolt and gasket type manhole or equivalent opening to permit access for inspection, repairs , and cleaning. The top shall be provided with a vent pipe which shall extend separately through the roof, or when permitted, may be combined with other vent pipes . Such vent shall be large enough to maintain atmospheric pressure within the sump under all normal operating conditions and in no case shall be less in size than that required by Table 98. 4 for the number of fixtures discharging into the sump, nor less than one and one-half (1 1/2) inches in diameter. when the foregoing requirements are met and the vent, after leaving the sump, is combined with vents from fixtures discharging into the sump, the size of the combined vent need not exceed that required for the total number of fixtures discharging into the sump. No vent from an air-operating sewage ejector shall combine with other vents. ' -3- (k) Air tanks shall be so proportioned as to be of equal cubical capacity to the ejectors connected therewith in which there shall be maintained an air pressure of not less than two (2) pounds for each foot of height the sewage is to be raised. No water operated ejectors shall be permitted. Section 3 . Any ordinance or part of an ordinances in conflict herewith is hereby repealed to the extent of such conflict. Section 4 . The ordinance shall be in full force and effect from and after its passage and publication as provided by ,law. Passed this 7th day �f January 1975. f, IJ + AV —.��,�,.? Mary E/Paul, City Clerk Villiam F. Pelz , Mayor lst Reading - December 3, 1974 Nelson-Koerber Voting aye : Huston, Koerber, Maxwell, Nelson. Voting nay: None. Absent : Calhoun, Pounds . 2nd Reading - December 17, 1974 Pounds-Nelson Voting aye : Calhoun, Huston, Koerber, Maxwell, Nelson, Pounds. Voting nay: None. 3rd Reading - January 7, 1975 Koerber-Maxwell Voting aye : Calhoun, Huston, Koerber, Maxwell, Nelson, Pounds. Voting nay: None.