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§ 8.30 Sevvage disposal systems <br />be rolled into a wire .125-inch in diameter, the moisture content is above the plastic <br />limit. If the soil is dry enough to be friable and falls apart when rolling it into a <br />wire, the moisture content is below the limit and the soil may be manipulated. The <br />standard method of determining the plastic limit is specified in American <br />Association of State Highway Officials (AASHO) Designation #T 90-61. <br />Sand is a soil texture composed by weight of at least 257 of very coarse, <br />coarse, and medium sand varying in size from 2 to 0.25 mm, less than 50To of fine <br />or very fine sand ranging in size between 1.25 and 1.05 men, and no more than 10% <br />of particles smaller than 0.05 mm. <br />Seepage Pit (or leaching pit or dry well) is an underground pit into <br />which a sewage tank discharges sewage or other liquid waste and from which the <br />liquid seeps into the surrounding soil through the bottom and openings in the side <br />of the pit. <br />Setback is a separation distance measured horizontally. <br />Sewage is any water -carried domestic, commercial, or agricultural <br />waste, exclusive of footing and roof drainage or any residence, or any industry, <br />agricultural, or commercial establishment or other structure, whether treated or <br />untreated, and includes but is not limited to liquid waste produced by bathing, <br />laundry, culinary operations and liquid wastes from toilets and floor drains, <br />Sewage Tank is a watertight tank used in the treatment of sewage and <br />includes, but is not limited to, septic tanks and aerobic tanks. <br />Sewage Tank Effluent is that liquid which flows from a septic or <br />aerobic tank under normal operation. <br />Septic Tank is any watertight covered receptacle designed and <br />constructed to receive the discharge of sewage from a building sewer, separate <br />solids from liquid, digest organic matter, and store solids through a period of <br />detention, and allow the clarified liquids to discharge to a soil treatment. <br />Shoreland means land located within the following distances from <br />public waters: <br />a. 1,000 feet from the normal high water mark of a lake, pond or <br />flowage; and <br />b. 300 feet from a river or stream or the landward extend of a flood <br />plain designated by ordinance on such a river or stream, <br />whichever is greater. <br />Site is the proposed on -site sewage treatment system area. <br />Slope is the ratio of vertical rise or fall to horizontal distance. <br />Soil Boring is any type of excavation capable of revealing in detail <br />characteristics of soils penetrated. <br />Soil Characteristics, Limiting are those soil characteristics which <br />preclude the installation of a standard system, including but not limited to e-, idence <br />Page 238 Printed 12/28/90 <br />19` 1 <br />