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Effective April 28, 2015 Chapter Four Subsurface Sewage Treatment System Regulations Table V — Minimum Setback Distances (Feet) Feature Sewage Tank Soil Treatment and Dispersal Area Water supply wells less than 50 feet deep and not encountering at least 10 feet of impervious material 50 100 Any other water supply well or buried suction pipe 50 50 Buried pipe distributing water under pressure 10 10 Occupied buildings and buildings with basements or crawl spaces 10 20 Non -occupied structures, deck post footings 5 10 Property lines 10 10 Above ground and in -ground swimming pools 10 10 The Ordinary High Water Level (OHWL)of: 7� Natural Environment Lakes 150 150 Recreational Development Lakes 75 75 General Development Lakes 75 75 Unclassified Body of Water 75 75 Transition Rivers/Streams 150 150 Tributary Rivers/Streams 150 150 St. Croix River -Rural Districts 150 150 St. Croix River -Urban Districts 100 100 Blufflines: St. Croix River Blufflines 40 40 Shoreland Blufflines 20 20 16.3 Other Technical Requirements for Systems. The following items are required for specific designs as determined in Section 17 to Section 21. (1) Employ components registered under Minnesota Rules 7083.4070 and 7083.4080 that are installed, used and operated according to the conditions placed on the registration. (2) Employ structural components and joint sealants that meet or exceed the system's expected design life. (3) For acceptable treatment of septic tank effluent by soil, the soil treatment and dispersal systems must meet the following requirements: (A) A minimum three-foot vertical soil treatment and dispersal zone must be designed below the distribution media that meets the following criteria: i. The zone must be above the periodically saturated soil and bedrock. The zone must be continuous and not be interrupted by seasonal zones of saturation. ii. Any soil layers that are any of the United Stated Department of Agriculture (USDA) soil textures classified as sand with 35 to 50 percent rock fragments must be credited at only one-half their thickness as part of the necessary treatment zone. Soil layers regardless of soil texture, with greater than 50 percent rock fragments must not be credited as part of the necessary treatment zone. Layers that are given full, partial, or no credit must, in any layering arrangement in the soil profile, be cumulatively added to determine the amount of soil treatment zone in accordance with other soil treatment zone provisions. iii. The entire treatment zone depth must be within seven feet from final grade. 61 Washington County Development Code