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Effective April 28, 2015 Chapter Four Subsurface Sewage Treatment System Regulations <br />Additional design considerations, such as equalization tanks, additional capacity, or secondary <br />treatment, are required for influent concentrations that exceed the levels identified in Section <br />5.2(2)(A) <br />13.28 MSTS Tank Geometry. <br />The maximum liquid depth of septic tanks to determine liquid capacity must be no greater than 84 inches. The <br />length -to -width ratio and the length -to -depth ratio must facilitate settling of solids. <br />13.30 MSTS Tank Testing. <br />All tanks used for MSTS must be tested for watertightness in accordance with Minnesota Rules, Chapter <br />7080.20102, Subp. (3). The test shall be conducted to include the watertightness of all connections and risers. <br />13.31 MSTS Liners. <br />Liners used as watertight barriers for treatment devices must be designed and constructed according to liner <br />requirements developed by the Commissioner of the Minnesota Pollution Control Agency. If conflicts exist <br />between this Chapter and those requirements, this Chapter applies. Compacted soil liners must not be used as <br />watertight barriers for treatment devices. Liners must be tested and must hold water without loss for 24 hours after <br />being filled to the top of the liner. <br />54 Washington County Development Code <br />