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15 INDIVIDUAL SUBSURFACE SEWAGE TREATMENT SYSTEMS 7080.1100 Subp. 26. Effluent screen. "Effluent screen" means a device installed on the outlet piping of a septic tank for the purpose of retaining solids of a specific size. Subp. 27. EPA. "EPA" means the United States Environmental Protection Agency. Subp. 28. Existing systems. "Existing systems" means systems that have been previously inspected and approved by the local unit of government during installation. In addition, all operating systems installed before the adoption of a local permitting and inspection program are considered existing systems. Subp. 29. Faint. "Faint" means a soil color: A. with the same hue as another soil color but that varies from the other color by two or less units of value and not more than one unit of chroma; B. that differs from another soil color by one hue and by one or less units of value and not more than one unit of chroma; or C. that differs from another soil color by two units of hue with the same value and chroma. Subp. 30. Fecal coliform or FC. "Fecal coliform" or "FC," for purposes of this chapter, means bacteria common to the digestive systems of humans that are cultured in standard tests. Counts of these organisms are typically used to indicate potential contamination from sewage or to describe a level of disinfection, generally expressed in colonies per 100 mL. Subp. 31. Fine sand. "Fine sand" means a sand soil texture, as described in the Field Book for Describing and Sampling Soils, which is incorporated by reference in subpart 36, where more than 50 percent of the sand has a particle size range of 0.05 millimeters, sieve size 270, to 0.25 millimeters, sieve size 60. Subp. 32. Flood fringe. "Flood fringe" means that portion of the floodplain outside the floodway. Flood fringe is synonymous with the term "floodway fringe" used in flood insurance studies. Subp. 33. Floodplain. "Floodplain" means the area covered by a 100-year flood event along lakes, rivers, and streams as published in technical studies by local, state, and federal agencies, or in the absence of these studies, estimates of the 100-year flood boundaries and elevations as developed according to a local unit of government's floodplain or related land use regulations. Subp. 34. Floodway. "Floodway" means the bed of a wetland or lake, the channel of a watercourse, and those portions of the adjoining floodplain that are reasonably required to carry the regional flood discharge. Subp. 35. Flow measurement. "Flow measurement" means any method to accurately measure water or sewage flow, including, but not limited to, water meters, event counters, running time clocks, or electronically controlled dosing. Subp. 36. Geomorphic description. "Geomorphic description" means the identification of the landscape, landform, and surface morphometry of the proposed area of the soil treatment and dispersal system as described in the Field Book for Describing and Sampling Soils: Version 2.0 (2002), developed by the National Soil Survey Center and Natural Resources Conservation Service of the United States Department of Agriculture. The field book is incorporated by reference, is not subject to frequent change, and is available through the Minitex interlibrary loan system. Subp. 37. Gray water. "Gray water" means sewage that does not contain toilet wastes. Subp. 38. Gray water system. "Gray water system" means a system that receives, treats, and disperses only gray water or other similar system as designated by the commissioner. Copyright ©2014 by the Rev so of Statutes, State of Minnesota. All Rights Reserved.