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Effective April 28, 2015 Chapter Four Subsurface Sewage Treatment System Regulations <br />13.16 Pump Tank Access. <br />Pump tanks must have a minimum of one maintenance hole with a minimum diameter of 20 inches (least dimension). <br />Enough maintenance holes must be provided so access can be gained within six feet of the walls for solids removal. <br />13.17 Maintenance Hole Risers to Grade. <br />All maintenance hole risers must extend through the tank cover above final grade. <br />13.18 Maintenance Hole Covers. <br />Covers for maintenance holes must: <br />(1) Be secured by being locked, being bolted or screwed, having a weight of at least 95 pounds, or <br />other methods approved by the Department or local unit of government. Covers shall also be leak <br />resistant; and be designed so the cover cannot be slid or flipped, which could allow unauthorized <br />access to the tank. <br />(2) Have a written and graphic label warning of the hazardous conditions inside the tank. <br />(3) Be capable of withstanding a load that the cover is anticipated to receive. <br />(4) Be made of a material suitable for outdoor use and resistant to ultraviolet degradation. <br />13.19 Concrete Tank Construction. <br />All precast reinforced concrete sewage tanks must be constructed to meet the requirements of this chapter. <br />Information on best practices for tank construction is found in the National Precast Concrete Association's best <br />practices manual, Precast Concrete On -site Wastewater Tanks (2005). This manual is incorporated by reference, is <br />available through the Minitex interlibrary loan system, and is not subject to frequent change. If a conflict exists <br />between the manual and this chapter, this chapter applies. <br />13.20 Non -Concrete Tank Construction. <br />All fiberglass -reinforced polyester and polyethylene tanks must be constructed to meet the requirements of this <br />chapter. Information on best practices for these tanks is found in the International Association of Plumbing and <br />Mechanical Officials (IAPMO), Material and Property Standard for Prefabricated Septic Tanks, Standard PS 1-2006 <br />(2006). This standard is incorporated by reference, is available through the Minitex interlibrary loan system, and is not <br />subject to frequent change. If conflicts exist between the standard and this chapter, this chapter applies. <br />13.21 Precast Reinforced Concrete Tanks. <br />Precast reinforced concrete tanks must: <br />(1) Have a method to lift the tank for an ultimate load that is four times the working load;. <br />(2) Undergo proper curing to achieve a compressive strength of 4,000 pounds per square inch before <br />transport, placement, or use; and <br />(3) Have no pipe penetration points or openings in the exterior walls or tank bottom below the tank <br />liquid level, unless designed for a specific operational purpose and approved by the Department <br />13.22 Other Tanks. <br />Fiberglass -reinforced polyester or polyethylene tanks must be protected against deterioration during storage. <br />13.23 Location and installation of tanks: <br />(1) Sewage tanks must not be located in areas that limit removal of solids and liquids from the tank <br />according to Section 22. <br />(2) Sewage tanks must be set back as specified in Table V in Section 16. <br />(3) The top of sewage tanks must not be buried deeper than four feet from final grade for new <br />dwellings and not exceed the tank manufacturer's maximum designed depth for the tank. The <br />minimum depth of soil cover over the insulation on the top of the tank is six inches. <br />51 Washington County Development Code <br />