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7080.1970 INDIVIDUAL SUBSURFACE SEWAGE TREATMENT SYSTEMS 34 D. The inlet baffle must extend at least six inches, but not more than 20 percent of the total liquid depth, below the liquid surface. The inlet baffle must extend above the liquid surface in compliance with part 7080.1920, item E, and at least one inch above the crown of the inlet sewer. E. The outlet baffle and any baffles between compartments must extend below the liquid surface a distance equal to 40 percent of the liquid depth, except that the penetration of the indicated baffles or sanitary tees for horizontal cylindrical tanks must be 35 percent of the total liquid depth. They must also extend above the liquid surface as determined in part 7080.1920, item E. F. There must be at least one inch between the underside of the top of the tank and the highest point of the inlet and outlet baffles. G. The nearest point on the inlet baffles other than sanitary tees must be no less than six inches and no more than 12 inches from the end of the inlet pipe. The nearest point on the outlet baffle, other than sanitary tees, must not be closer than six inches and no more than 12 inches from the beginning of the outlet pipe to the baffle. Sanitary tees used as inlet or outlet baffles must be at least four inches in diameter. Statutory Authority: MS s 115.03; 115.55 History: 32 SR 1347; 35 SR 1353 Published Electronically: October 10, 2013 7080.1970 SEWAGE TANK ACCESS. A. Septic tanks must have a minimum of two maintenance holes with a minimum diameter of 20 inches (least dimension). Maintenance holes must be placed over the inlet baffle or the center of the tank and the outlet device (baffle or screen). The maintenance holes must be large enough to allow pumping without interference. Enough maintenance holes must be provided so access can be gained within six feet of all walls for solids removal of each compartment. Inspection pipes of no less than six inches must be provided over any baffles that are not otherwise accessible through a maintenance hole. B. Pump tanks must have a minimum of one maintenance hole with a minimum diameter of 20 inches (least dimension). Enough maintenance holes must be provided so access can be gained within six feet of all walls for solids removal. C. All maintenance hole risers must extend through the tank cover above final grade. D. Covers for maintenance holes must: (1) be secured by being locked, being bolted or screwed, having a weight of at least 95 pounds, or other methods approved by the local unit of government. Covers shall also be leak resistant; and be designed so the cover cannot be slid or flipped, which could allow unauthorized access to the tank; (2) have a written and graphic label warning of the hazardous conditions inside the tank; (3) be capable of withstanding a load that the cover is anticipated to receive; and (4) be made of a material suitable for outdoor use and resistant to ultraviolet degradation. Statutory Authority: MS s 115.03; 115.55 History: 32 SR 1347; 35 SR 1353 Published Electronically: October 10, 2013 Copyright ©2014 by the Rev so of Statutes, State of Minnesota. All Rights Reserved.