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Effective April 28, 2015 Chapter Four Subsurface Sewage Treatment System Regulations <br />SECTION 21 TYPE V SYSTEMS <br />21.1 Type V Systems. <br />A system designed according to this part is considered a Type V system. The system must: <br />(1) Employ design flow values set forth in Section 12. <br />(2) Meet the requirements of Section 16.2. <br />(3) Be designed with vertical separation that ensures adequate sewage dispersal and treatment. Design <br />factors to consider include, but are not limited to, effluent quality, loading rates, groundwater <br />mounding if loading rates are in excess of those in Table VI or Table VIa, loading methods, and <br />soil conditions. SSTS must not contaminate underground waters or zones of periodic saturation <br />with viable fecal organisms. <br />21.2 Previously Developed Sites. <br />Type V systems may be used on previously developed sites only when a Type I or Type 11 system cannot be <br />installed or is not the most suitable treatment. <br />21.3 Type V Systems Allowed. <br />Type V systems will be allowed for undeveloped lots only when two Type I or Type 11 soil treatment and dispersal <br />areas have been identified on the lot, in addition to the area utilized by the Type V soil treatment and dispersal area. <br />The lot must be able to accommodate long-term sewage treatment in addition to the area utilized by the Type V <br />system. <br />79 Washington County Development Code <br />