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c. Each hole shall be numbered and its location shall be plotted on a scale map of the lot or building site. d. A soil texture description shall be recorded by depth and notations made where texture changes occur. e. Particular effort shall be made to determine the highest known water table. hole. f. Record the first occurrence of mottling observed in the g. If mottling is not encountered, the open holes in clay or loam soils shall be observed after standing undisturbed a :minimum of sixteen (16) hours, and depth to standing water, if present, shall be measured. h. Soil borings shall be refilled with the same material and compacted in six (6) inch layers to prevent contamination. i. Soil boring data shall be submitted to the local unit of government. Percolation Tests: a. Each test hole shall be six (6) to eight (8) inches in diameter, have vertical sides and be bored or dug to the depth of the bottom of the proposed individual sewage treatment system. b. Each test hold shall be numbered and its location shall be plotted on a scale map of the real property or building site. c. Soil texture descriptions shall be recorded, noting depths where texture changes occur. d. The bottom and sides of the hole shall be carefully scratched to remove any smearing and to provide a natural soil surface into which water may penetrate. e. All loose material shall be removed from the bottom of the test hole and two (2) inches of 1/4 to 3/4 inch gravel shall be added to protect the bottom from scouring. f. The hole shall be carefully filled with clear water to a minimum depth of twelve (12) inches over the soil at the bottom of the test hole and maintained for no less than four (4) hours. g. The soil shall then be allowed to swell for least sixteen (16), but no more than thirty (30) hours. In sandy soils, the swelling procedure shall not be required and the test may proceed if one (1) filling of the hole has seeped away in less than ten (10) minutes. L it L 7 L Y L 1 t - 1 4 u if