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

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7080.2010 INDIVIDUAL SUBSURFACE SEWAGE TREATMENT SYSTEMS 36 D. Sewage tanks must not be placed in floodways, drainageways, or swales. Upslope drainage must be diverted away from the location of all tanks. A tank's final cover must be crowned or sloped to shed surface water. E. Sewage tanks must not be placed in areas subject to vehicular traffic unless engineered for the anticipated load. F. Sewage tanks must be placed on firm and evenly compacted soil and with the soil level in all directions. The bottom shall be excavated in a manner so the vertical load is borne by the tank walls and not the tank bottom. If the bottom of the tank excavation contains rocks, bedding material must be used according to manufacturer's instructions. The soil beneath the tank must be capable of bearing the weight of the tank and its contents. G. Sewage tanks and risers must be installed according to manufacturer's requirements and in a structurally sound and watertight fashion. H. If the top of a sewage tank is to be less than two feet from final grade, the lid of the tank must be insulated to an R-value of ten. Maintenance hole covers must be insulated to an R-value of ten. All insulating materials must be resistant to water absorption. I. Sewage tanks placed below the level of the periodically saturated soil must employ a method to protect against flotation under periodic saturated soil conditions when the tank is empty. J. Connections between the concrete tank and the building sewer or supply pipe must meet the requirements of American Society for Testing and Materials, Standard Specification for Resilient Connectors Between Reinforced Concrete Manhole Structures, Pipes, and Laterals, ASTM C923 (2002), or equivalent. The standard is incorporated by reference, is available through the Minitex interlibrary loan system, and is not subject to frequent change. K. Joints of concrete tanks, concrete tank lids, and concrete risers must be sealed using a bonding compound that meets American Society for Testing and Materials, Standard Specification for Joints for Concrete Pipe, Manholes, and Precast Box Sections Using Preformed Flexible Joint Sealants, ASTM C990 (2003). The standard is incorporated by reference, is available through the Minitex interlibrary loan system, and is not subject to frequent change. Statutory Authority: MS s 11 S. 03; 115.55 History: 32 SR 1347 Published Electronically: October 10, 2013 7080.2010 TANK ASSESSMENT. Subpart 1. General. A. All sewage tanks must be watertight, including at all tank and riser joints, riser connections, and pipe connections. B. An assessment of all models of sewage tanks to be used must be conducted to determine: (1) the structural integrity of the tank design; and (2) the adequacy of the manufacturing process of watertightness. C. Sewage tanks, including riser joints, riser connections, and pipe connections must be designed, manufactured, and installed to be watertight under normal use. Copyright ©2014 by the Rev so of Statutes, State of Minnesota. All Rights Reserved.