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a. Sludge buildup. Sewage tanks shall be pumped whenever measurement of the <br /> tank indicates that the top of the sludge layer in the tank or any compartment <br /> thereof is less than 12 inches below the bottom of the outlet device,or the <br /> floating solids layer is less than three inches from the bottom of the outlet device. <br /> b. Maintenance pumping. No sewage tank shall remain in service without being <br /> pumped at least once every three years,whether or not measurement indicates a <br /> sludge buildup. Each existing septic tank shall be pumped at least once within 36 <br /> months of the effective date of the ordinance from which this article is derived <br /> and thereafter at least once within 36 months of each succeeding pumping. In <br /> order to be considered a maintenance pumpout,the manhole or cover section(20- <br /> inch diameter minimum)must be removed to allow the complete extraction of <br /> the solid materials within the sewage tank. The contractor must also determine <br /> whether the tanks are watertight and report this information on the pumpout <br /> notification.Failure to adhere to these requirements will result in the city's <br /> rejection of the pumpout notification as a bona fide maintenance pumpout. <br /> c. System failure. A noncompliant ISTS discharging pollutants shall have the <br /> sewage tanks regularly pumped to limit or eliminate effluent discharge until <br /> satisfactory repairs have been completed. <br /> d. Holding tanks. Holding tanks shall be pumped on a regular basis and in all cases <br /> shall be pumped before overflowing occurs. All new holding tank installations <br /> will require review by the�se�s�onsite septic mana_ger. Holding tanks shall <br /> be vrovided with a si�ht and sound alarm to warn of nossible overflow <br /> (2) Contractor required. All sewage fi�and holding tank pumpings,shall be performed by <br /> licensed contractors. <br /> (3) Off-site disposal required. All septage removed from sewage tanks or holding tanks shall <br /> be removed from the site in sealed containers and shall be disposed of in a sanitary <br /> location and manner according to the requirements of the Metropolitan Council. <br /> (4) Registration required. Each pumping of every sewage tank and holding tank shall be <br /> registered with the city on forms provided for that purpose,within thirty days of the <br /> pumping. 'The contractor shall certify to the city the owners of the property,property <br /> address, date of pumping, gallons removed and location of sanitary disposal. Failure to <br /> register any pumping with the city may result in the city inspection report's classifying <br /> the ISTS as noncompliant. <br /> (Code 1984, § 12.30(6); Ord.No. 100 2nd series, § 4,2-10-1992; Ord.No. 147 2nd series, §§ 16, 17,5- <br /> 13-1996; Ord.No. 199 2nd series, § 1(12.30(6)), 5-8-2000) <br /> Sec. 58-52. Special provisions for Lake Minnetonka islands. <br /> All lots,properties,buildings and structures on Big Island,Mahpiyata Island and Deering Island, <br /> Lake Minnetonka, shall be provided with ISTS's which comply with the requirements of this article, as <br /> amended by the following special provisions and specific exceptions pertaining to island properties: <br /> Page 12 of 18 <br />