Agenda - Council - 05/13/2014 - Laserfiche WebLink

Home

37 INDIVIDUAL SUBSURFACE SEWAGE TREATMENT SYSTEMS 7080.2020 Subp. 2. Structural integrity of design test. The structural integrity of each model of tank manufactured and all poured -in -place tanks must be verified by calculation, proof testing, or a licensed professional engineer to determine the horizontal and vertical loads that the tank can withstand when empty. Tanks must be reverified for structural integrity if the design, materials, or construction methods are modified. A licensed professional engineer shall certify in writing if different manufactured models are similar enough so that the structural integrity information for one model is valid for other models. Verifications must be submitted to the commissioner. The commissioner shall maintain and make available the verifications upon request. Subp. 3. Watertightness test. A. At least one tank per year, per model must be tested for watertightness. All poured -in -place tanks shall be tested for watertightness. Records of testing must be maintained by the manufacturer for three years and must be available to the commissioner and local unit of government if requested. Tanks must be tested and meet or exceed the applicable requirements of subitem (1), (2), or (3): (1) when empty, a tank must maintain a vacuum of at least two inches of mercury for five minutes, without loss of pressure; (2) concrete tanks must hold water for one hour, without loss, after the tank has been filled with water to the top of the tank, let stand for 24 hours, and then refilled to the same level; or (3) fiberglass -reinforced polyester or polyethylene sewage tanks must hold water without loss for one hour after being filled. B. Sewage tanks that do not pass the tests listed in item A must not be used until repaired and retested. The repair and retest procedure must be repeated until the tank passes the test or the tank must not be used. Statutory Authority: MS s 115.03; 115.55 History: 32 SR 1347 Published Electronically: October 10, 2013 7080.2020 TANK IDENTIFICATION. A. Sewage tanks must be marked near the outlet with: (1) the manufacturer's name; (2) model number; (3) liquid capacity; (4) date of manufacture; and (5) maximum depth of burial. B. The tank manufacturer or manufacturer's agent shall provide the information in item A to the installer in writing. C. The tank inlet or outlet must be clearly marked. D. The installer shall submit the information in item A with the as -built drawing. Copyright ©2014 by the Rev so of Statutes, State of Minnesota. All Rights Reserved.