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evaluation of the alternative site. <br />5. If a detailed field evaluation is deemed necessary, the <br />plumbing inspector shall employ the following procedures: <br />a. A preliminary soil boring shall be required in the <br />center of the proposed individual sewage treatment system in <br />accordance with the procedures presented in Section I70.038H. <br />b. If no limiting soil characteristics are revealed by the <br />preliminary soil boring, either a preliminary percolation test <br />shall be required in accordance with the procedures presented in <br />Section 170.03 88(6) or the percolation rate at the depth of the <br />proposed system shall be estimated from other available <br />information. <br />c. The plumbing inspector shall determine preliminary <br />treatment area size based upon the measured or estimated <br />percolation rate and other criteria presented in Section 150.014. <br />d. The plumbing inspector shall require at least one (1) <br />additional soil boring, following procedures set forth in Section <br />170.0388(6), spaced equidistant across the proposed area noting <br />and recording soil texture. At least one (1) boring shall be <br />made at the bottom of the lowest proposed trench bed elevation. <br />Each boring shall represent no more than five hundred (500) <br />square feet of lawn area on one soil type; a minimum of two (2) <br />borings shall be made on each soil type. <br />e. If no limiting characteristics are found in the <br />additional soil borings, the plumbing inspector shall conduct at <br />least one (1) additional percolation test, following the <br />procedures set forth in Section 170.0388(6). Each test hole <br />shall represent no more than seven hundred fifty (750) square <br />feet of lawn area on one soil type; a minimum of two (2) <br />percolation tests shall be conducted on each soil type. <br />f. Percolation rates shall be averaged by soil type. If <br />all averages by soil type are within one -half (1/2) and sixty <br />(60) minutes per inch, installation of a properly designed <br />standard system may be allowed. <br />6. Procedures for soil borings and percolation tests: <br />Soil Borings: <br />a. Soil borings shall be any type of boring or excavation <br />capable of revealing in detail characteristics of soils <br />penetrated. <br />b. Each boring or excavation shall be made to a depth at <br />least three (3) feet deeper than the bottom of the proposed <br />system or until bedrock or a water table is encountered, <br />whichever is less. <br />A <br />