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(a) Soil borings shall be any type of borina or excavation capable of <br />revealing in detail characteristics of soils penetrated. <br /> <br /> (b) Each boring or excavation shall be made to a depth at least three feet <br />deeper than the bottom of the proposed system or until bedrock or a water table <br />is encountered, whichever is less. <br /> <br /> (c) Each hole shall be numbered, and its location shall be plotted on a <br />scale map of the lot or building site. <br /> <br /> (d) A soil texture description shall be recorded by depth and notations made <br />where texture changes occur. <br /> <br />(e) <br /> <br />(f) <br /> <br />(g) <br /> <br />Particular effort shall be made to determine the highest known water table. <br /> <br />Record the first occurence of mottling observed in the hole. <br /> <br /> If mottling is not encountered, the open holes in clay or loam soils shall <br />be observed after standing undisturbed a minimum of 16 hours, and depth to standing <br />water, if present shall be measured. <br /> <br /> (h) Soil borings shall be refilled with the same material and compacted in <br />six-inch layers to prevent contamination. <br /> <br />(i) Soil boring data shall be submitted to the local unit of government. <br /> <br />(2) Percolation Tests <br /> <br /> (a) Each test hole shall be six to eight inches in diameter, have vertical <br />sides, and be bored or dug to the depth of the bottom of the proposed individual <br />sewage treatment system. <br /> <br /> (b) Each test hole shall be numbered, and its location shall be plotted on a <br />scale map of the real property or building site. <br /> <br /> (c) Soil texture descriptions shall be recorded noting depths where texture <br />changes occur. <br /> <br /> (d) The bottom and sides of the hole shall be carefully scratched to remove <br />any smearin~ and to provide a natural soil surface into which water may penetrate. <br /> <br /> (e) All loose material shall be removed from the bottom of the test hole and <br />two inches of 1/4 to 3/4 inch gravel shall be added to protect the bottom from <br />scouring. <br /> <br /> (f) The hole shall be carefully filled with clear water to a minimum depth of <br />12 inches over the soil at the bottom of the test hole and maintained for no less <br />than four hours. <br /> <br /> (g) The soil shall then be allowed to swell for at least 16, but no more than <br />30 hours. In sandy soils, the swelling procedure shall not be required and the test <br /> <br />-3- <br /> <br /> <br />