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REVISOR 7080.2450 MAINTENANCE. 7080.2450 Subpart 1. General.. All ISTS must be operated under -the.regulatory requirements of part 7082.0600. ISTS and all components. must be maintained in compliance .with this chapter and manufacturer requirements. Subpart:2, .items A .and B; are intended to apply to ISTS and systems that do not qualify as an ISTS,, but receives sewage such as- cesspools, drywells, leachingpits, or other pits. Subp. 2. Frequency of assessment. The owner of an ISTS or the owner's agent shall regularly, but in no case less frequently than every three years: A. assess whether sewage tanks leak below the: designed -operating depth and whether sewage tank tops, riser joints, .arid riser connections leak through visual evidence .of major defects; 'and B. measure :or remove the accumulations of scum, grease; and other floating materials at the. -top .of each septic tank and, compartment, along with the sludge; which. consists o f the solids. denser than water. Subp. 3. Removal.of material.. A: :Ail -solids and liquids must be removed by pumping fmin all tanks or compartments- in which the-tbp of thd*-sludge layer is. less than 12 inches fk6m..the bottom. of the outlet baffle or-transftr hole or whenever the bottom of the scum layer is less than thc°ee: inches. above the -bottom of the bUtlet: baffle or :transfer hole. Total sludge and scum volume must not be greater than 25 percent of the tanles H40id capacity. B. Removal of accumulated sludge, scur>rt, and liquids rrom septic. tanks and pump tanks must be through the maintenance hole. The. removal. of solids from any location other than the maintenance. hole is--not.a compliant method -of solids removal from a sewage tank, and this method does not fulfill the. solids removat requirement of this part. or a. management plan. Liquid and solids removal from clean -out pipes is allowed for holding tanks. G. After removal of solids and lig4ids-froin a system installed after the adoption of a local ordinance adopted after February 4, 2008., the maintenance hole cover must be secured as described in part .7080.1970, item D. Covers secured by screws must be refastened in all. screw openings. D. After removal of solids and liquids from a system installed before the adoption of a local ordinance adopted after February 4, 2008, maintenance hole.covers;must be sound, durable, and. of adequate strength as specified in. part 7080.1970, item 1), subitem. {3.), ands {1) be buried with a minim. um. 12 inches of soil cover or, if -the cover is.. currently at.ot above the ground surface or within 12 inches, from final grade; be. seared by Copyright 02014. by the: Revisor of Statutesi State of Minnesota. All Rights Reserved.