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6 <br /> <br />"On-site Sewage Treatment System" (OSTS) is a sewage treatment system or part thereof, <br />serving a dwelling or building, or group thereof, which utilizes soil treatment and disposal. <br /> <br />"Parallel Distribution" is the distribution of sewage tank effluent by gravity which loads all <br />sections of an on-site sewage treatment system equally at the same time. <br /> <br /> <br />"Percolation Rate" is the timed rate of drop of water infiltrating into a test hole. The percolation <br />rate can be determined by the percolation test. See Appendix A Procedures for Soil <br />Determination Material Acceptability. <br /> <br /> <br />"Permeability" the rate with which gases or liquids penetrate or pass through a bulk mass of soil <br />or layer of soil. <br /> <br />"Plastic Limit" is soil moisture content below which the soil may be manipulated for purposes of <br />installing a soil treatment system and above which manipulation will cause compaction or <br />smearing. If a fragment of soil can easily be rolled into a wire 1/8 inch diameter, the moisture <br />content is above the limit and the soil cannot be used. The standard method of determining the <br />plastic limit is specified by the American Association of State Highway Officials (AASHO) <br />Designation: #T 90-61. <br /> <br />"Professional Engineer" shall mean an individual who by reason of special knowledge or use of <br />the mathematical, physical, and engineering sciences and the principles and methods of <br />engineering analysis and design, acquired by engineering education and engineering experience, <br />is qualified to practice engineering, and who has been registered and licensed by the state board <br />of registration for professional engineers and land surveyors. <br /> <br /> <br />"Redoximorphic Features” (Active Mottling) reflects alternating reduction and oxidation <br />conditions due to water table fluctuations. <br /> <br /> <br />"Registered Professional Soil Classifier" shall mean a person who by reason of their special <br />knowledge of the physical, chemical, and biological sciences applicable to soils as natural bodies <br />and of the methods and principles of soil classification as required by soils education and soil <br />classification experience in the formation, morphology, description, and mapping of soils is <br />qualified to practice soil classifying and who has been duly registered by the State Board of <br />Registration for Professional Soil Classifiers, as per North Dakota Century Code, Chapter 43-36. <br /> <br /> <br />"Serial Distribution" is the distribution of sewage tank effluent by gravity that progressively <br />loads one section of an on-site sewage treatment system to a predetermined level before <br />overflowing to the succeeding section.