2019.02.04 CC Packet - Laserfiche WebLink

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Effective April 28, 2015 Chapter Four Subsurface Sewage Treatment System Regulations SECTION 9 SITE EVALUATION AND SOIL TESTING 9.1 Design Phase I; Site Evaluation. Site evaluations consisting of preliminary and field evaluations according to parts this Section must be conducted for all proposed sites for SSTS, including both ISTS and MSTS. The site evaluation is considered the first phase of an SSTS design. 9.2 Preliminary Evaluation. A preliminary evaluation for individual subsurface sewage treatment systems shall consist of determination, location, or existence of the following : (1) Design flow, anticipated effluent concentrations of biochemical oxygen demand, total suspended solids, oil and grease, and anticipated presence of nondomestic waste from the dwelling, dwellings, or other establishments. (2) Proposed or existing: (A) Water supply wells within 100 feet of the proposed SSTS; (B) Existing and proposed buildings or improvements on the lot; and, (C) Buried water supply pipes within 50 feet of the proposed system. (3) Easements on the lot. (4) The ordinary high water level of public waters, if adjacent to the lot. (5) Floodplain designation and flooding elevation from published data or data that is acceptable to and approved by the Department or local unit of government or the Minnesota Department of Natural Resources, if applicable. (6) Property lines. (7) All required setbacks from the system. (8) The soil characteristics at the proposed soil treatment and dispersal areas as obtained by the soil survey report, including the soil map, map units, landscape position, parent material, flooding potential, slope range, periodically saturated soil level, depth to bedrock, texture, color, depth to redoximorphic features, and structure and consistence of soil horizons. (9) A geocode or property identification number. (10) Names of property owners. (11) The inner wellhead management zone or wellhead protection area of a public water supply, if applicable. 9.3 Field Evaluation. A field evaluation for an individual subsurface sewage treatment system shall consist of the following items: (1) Lot lines. Lot lines shall be confirmed in the field. .Lot improvements, required setbacks, and easements must be identified. (2) Surface features. The following surface features must be described: (A) The percent and direction of the slope of the proposed system location. (B) Vegetation types. (C) Any evidence of cut or filled areas or disturbed or compacted soil. (D) The flooding or run-on potential. (E) A geomorphic description. 9.4 Minimum Size, Soil Treatment Area. For new subdivision testing, enough soil observations must be conducted to assure that at least 10,000 square feet of suitable soil exists for each lot for long-term sewage treatment. On previously subdivided lots, enough area of suitable soil must be identified for two soil treatment and dispersal areas. Percolation tests are not required for subdivision or lot approval testing unless the permeability cannot be estimated or there is reason to believe the soil is not original or has been disturbed. 34 Washington County Development Code