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59 INDIVIDUAL SUBSURFACE SEWAGE TREATMENT SYSTEMS 7080.2450 <br />Statutory Authority: MS s 115.03; 115.55 <br />History: 32 SR 1347; 35 SR 1353 <br />Published Electronically: October 10, 2013 <br />7080.2430 REPORTING. <br />Phase 11 design reports must include detailed drawings, design flows, system component sizing and <br />calculations, hydraulic and organic loading rates, setbacks, location and elevations for construction, and <br />management plans as described in part 7082.0600, subpart 1, and a certified statement. <br />Statutory Authority: MS s 115.03; 115.55 <br />History: 32 SR 1347 <br />Published Electronically: October 10, 2013 <br />7080.2440 COLLECTION SYSTEMS. <br />Collection of greater than 2,500 gallons per day of sewage from multiple buildings or multiple other <br />establishments discharging into an ISTS must be: <br />A. according to the Prescriptive Designs and Design Guidance for Advanced Designers, <br />incorporated by reference under part 7080.1550, subpart 2; or <br />B. designed by a Minnesota licensed professional engineer. <br />Statutory Authority: MS s 115.03; 115.55 <br />History: 35 SR 1353 <br />Published Electronically: October 10, 2013 <br />7080.2450 MAINTENANCE. <br />Subpart 1. General. All ISTS must be operated under the regulatory requirements of part <br />7082.0600. ISTS and all components must be maintained in compliance with this chapter and manufacturer <br />requirements. Subpart 2, items A and B, are intended to apply to ISTS and systems that do not qualify as <br />an ISTS, but receives sewage such as cesspools, drywells, leaching pits, or other pits. <br />Subp. 2. Frequency of assessment. The owner of an ISTS or the owner's agent shall regularly, but <br />in no case less frequently than every three years: <br />A. assess whether sewage tanks leak below the designed operating depth and whether sewage <br />tank tops, riser joints, and riser connections leak through visual evidence of major defects; and <br />B. measure or remove the accumulations of scum, grease, and other floating materials at the <br />top of each septic tank and compartment, along with the sludge, which consists of the solids denser than <br />water. <br />Subp. 3. Removal of material. <br />A. All solids and liquids must be removed by pumping from all tanks or compartments in <br />which the top of the sludge layer is less than 12 inches from the bottom of the outlet baffle or transfer hole <br />Copyright ©2014 by the Rev <br />so <br />of Statutes, State of Minnesota. All Rights Reserved. <br />