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� . <br /> ( 5) If one ( 1 ) or more borings encounters unsuitable or <br /> limiting conditions, additiohal borings shall be made <br /> in order to outline an adequate area of suitable soil <br /> conditions. If the minimum site area cannot be <br /> identified by suitable borings, work should be <br /> suspended and the data submitted to the Zoning <br /> Administrator. <br /> 403.05. Percolation Tests. For all sites, after soil borings <br /> have outlined the minimum area of suitable soils, Percolation Tests <br /> shall be made as follows: <br /> ( 1 ) Test hole locations and dimensions: <br /> a. Within the outlined area, a minimum of two (2) <br /> percolation tests, evenly spaced shall be made. <br /> Where soil conditions vary within the tested area, <br /> one ( 1 ) additional percolation test shall be made <br /> in each soil type. <br /> b. Each test hole shall be six (6) to eight (8) <br /> inches in diameter, have vertical sides, and be <br /> bored or-dug- to the depth 'of the bottom of the <br /> proposed drainfield trench. <br /> c . Hole diameter and soil texture descriptions shall <br /> be recorded noting depths where texture changes <br /> occur. <br /> (2) Preparation of the test hole: <br /> a. The bottom and sides of the hole shall be <br /> carefully scratched to remove any smearing and to <br /> provide a natural soil surface. <br /> b. All loose material shall be removed from the <br /> bottom of the test hole and two (2) inches of <br /> cuoe=quar±er .(1/4) -to three-quarters (3/4) inch <br /> gravel shall be placed in the hole to protect the <br /> bottom from scouring . <br /> (3) Soil saturation and swelling : <br /> a. The hole shall be carefully filled with clear <br /> water to a minimum depth of twelve ( 12) inches <br /> above the hole bottom and maintained at this depth <br /> for not less than four (4) hours. (Failure to <br /> adequately saturate the test hole may result in <br /> rejection of the test. ) <br /> b. The soil shall then be allowed to swell for at <br /> least sixteen ( 16 ) but not more than thirty (30) <br /> hours. In soils classified as sand , the <br /> saturation and swelling procedure shall not be <br /> required and the test may proceed if one ( 1 ) <br /> filling of the hole has seeped away in less than <br /> ten ( 10) minutes, <br /> L11 <br />