2019.02.04 CC Packet - Laserfiche WebLink

Home

Effective April 28, 2015 Chapter Four Subsurface Sewage Treatment System Regulations SECTION 19 TYPE III SYSTEMS 19.1 Type III Systems. A system that deviates from the requirements in Section 17 is considered a Type III system. A system in soils with a loading rate of less than 0.45 gallons per day per square foot may be installed on previously developed sites as a Type III system. Deviations from the standards in Section 17 of the Chapter must be submitted to the Department or for approval or denial. However, no deviation is allowed from the following standards; and, at a minimum a Type III system must: (1) Employ design flow values set forth in Section 12. (2) Meet the requirements of Section 13. (3) Meet or exceed technical requirements in Section 14. (4) Meet the requirements in Section 15 with mound and at -grade systems required to have pressure distribution. (5) Provide flow measurement. (6) Meet the requirements of Section 16.2 and 16.4. (7) Meet the requirements of Section 16.3 (1), Section 16.3 (2), Section 16.3 (3), Section 16.3 (6), Section 16.3 (7), Section 16.3 (8), and Section 16.3 (9). (8) Follow the absorption loading rates in Table VI or Table VIa. (9) For previously developed sites, if the site cannot accommodate a soil treatment and dispersal system sized in accordance with Table VI or Table VIa, a smaller soil treatment and dispersal system is allowed to be constructed if it employs flow restriction devices that do not allow loadings in excess of those in Table VI or Table VIa. In those cases where a loading rate or mound absorption ratio is not listed in Table VI or Table VIa, an alternative loading rate or absorption ratio must be proposed. 19.2 Flow Restriction Device. Absorption areas sized smaller than a Type I system must employ flow restriction devices that to not allow absorption area loadings in excess of those in Table VI or Table VIa. This provision does not apply to the original soil, clean sand absorption area of a mound system. 19.3 Previously Developed Sites. Type III systems may be used on previously developed sites only when a Type I or Type II system cannot be installed or is not the most suitable treatment. 19.4 Type III Systems Allowed. Type III systems will be allowed for undeveloped lots only when two Type I or Type II soil treatment and dispersal areas have been identified on the lot, in addition to the area utilized by the Type III soil treatment and dispersal area. The lot must be able to accommodate long-term sewage treatment in addition to the area utilized by the Type III system. 19.5 Graywater Systems (1) General. Graywater Systems shall be classified as a Type III system and must meet or exceed the following requirements: (A) Employ 60 percent of the flow values in Section 12. (B) Meet or exceed applicable requirements of Section 13, Section 14, and Section 15, except as modified in this part. (C) Meet or exceed the requirements of Section 17. (D) Meet or exceed the requirements of Section 16.2 and Section 16.3. (2) Toilet Waste. Toilet waste must not be discharged to a graywater system. 76 Washington County Development Code