2019.02.04 CC Packet - Laserfiche WebLink

Home

Effective April 28, 2015 Chapter Four Subsurface Sewage Treatment System Regulations (A) Soil pits are required to investigate the soil for MSTS design. The required number of soil pits to adequately define the limiting layer and soil dispersal system sizing must be determined by professional judgment based on the size of the area, and consistency of the soil, and must be approved by the Department. (B) The qualifying soil observation pits to be used for the MSTS design must be located on or near the borders of the proposed soil treatment and dispersal area. Soil observation pits must be dug outside the soil dispersal area, if possible. The soil must be observed and described to a depth of at least three feet below the proposed depth of the system. Other soil observation pits are allowed to supplement the required soil observation pit information. (C) Underground utilities must be located before soil observations are undertaken. Required safety precautions must be taken before entering soil observation pits. 10.4 Soil Description. The following soil observations must be made: (1) The soil properties and features described in items (A) to (M) must be described according to the Field Book for Describing and Sampling Soils, version 2, Natural Resources Conservation Service, United States Department of Agriculture (September 2001), for each soil horizon at each qualifying pit. The field book is incorporated by reference under Section 2.2 (46). (A) Matrix soil color. (B) Soil features that have different colors from the matrix color, including, but not limited to, clay films, organic stains, silt coats, nodules, and concretions. (C) Abundance, size, color, and contrast of redoximorphic features. (D) Soil texture, with modifiers. (E) Grade, size, and shape of soil structure. (F) Moist soil consistence. (G) Abundance and size of rock fragments. (H) Abundance and size of roots. (I) Horizon boundary conditions. (J) Parent materials. (K) Pores, quantity and size. (L) Quantity of boulders and tree stumps affecting construction. (M) Any other characteristics of feature that affects permeability of the soil or treatment of sewage effluent. (2) The depth to bedrock, if encountered, must be determined by the definition in Section 2.2 (9). (3) The elevation of standing water evident in any soil pit must be identified. (4) The soil must not be described when frozen, at improper moisture content, or under poor light conditions. 10.5 Method. Hydraulic conductivity testing of the soil must be employed, along with a determination of the soil's texture, structure, and consistence, to determine the loading rate of effluent in the soil. The frequency of observations and measurements must be determined by the professional judgment of the designer, dependent on the variation in soil conditions and the system size, with the frequency of the observations and measurements approved by the Department. 10.6 Comparison with Soil Survey. All field soil information gathered must be compared with soil survey information. Any discrepancies shall be identified. 10.7 Site and Soil Information. 40 Washington County Development Code